Cities Index.
Agenda packet

Oxnard City Council
June 16, 2026

Document
Agenda packet
Meeting
June 16, 2026
Body
Oxnard City Council
Pages
45
Original file
302.5 MB
Text extracted from the city's file for reading and search. Open the original on oxnardca.api.civicclerk.com. That file is the official record.

VCWPD (Ventura County Watershed Protection District). 2013. 2013 Groundwater Section Annual Report. VCWPD, Water and Environmental Resources Division. Accessed August 8, 2017. http://pwaportal.ventura.org/WPD/docs/Groundwater-Resources/2013- Groundwater-Section-Annual-Report-Final_Web.pdf.
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2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-83
Weber, F.H., and E.W. Kiessling. 1976. “General Features of Seismic Hazards of Ventura County, California.” In Seismic Hazards Study of Ventura County, California. Prepared by the California Division of Mines and Geology in cooperation with the County of Ventura. Adopted 1975. Revised July 1976.

WRA (WRA Environmental Consultants). 2007. Final Biological Assessment Ormond Beach, Oxnard, Ventura County, California.

Yeats, R.S. 1988. “Late Quaternary Slip Rate on the Oak Ridge Fault, Transverse Ranges, California: Implications for Seismic Risk.” Journal of Geophysical Research 93(B10):
12137–12149.
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-84
Table 2-1
Oxnard Subbasin Stratigraphic and Hydrostratigraphic Nomenclature Geologic
Period
Geologic
Epoch
Mukae and Turner (1975)
Kew (1924); Bailey
(1951)a
Weber and Kiessling
(1976) Dibblee (1992a, 1992b)
Mukae and Turner (1975); DWR
(2006)
Lithologic Units and Formations Hydrostratigraphy
Quaternary Holocene Alluvium: Active stream deposits,
sand, and gravel; stream, swamp,
and lagunal deposits of clay, sand,
and gravel
Recent Alluvium: Active lagoonal, beach, river, and floodplain and alluvial deposits
Oxnard SemiPerchedUpper
Aquifer
Upper System
Pleistocene
Terrace deposits:

Deformed river
deposits
Older Alluvium: Deformed beach, river,
floodplain, and terrace deposits
Oxnard
Older Alluvium: Clays silts,
sands, and gravels from the Santa
Clara River
Mugu
Saugus
Formation:

Terrestrial and
marine sand and
gravel
Saugus Formation:

Terrestrial fluvial
Saugus Formation:

Terrestrial
San Pedro
Formation: Marine
clays and sand and
terrestrial sediment
Hueneme Lower
Aquifer
System
Lower
Pleistocene
San Pedro Formation: Marine
and nonmarine clay, sand, and
gravel
Las Posas Sand:

Shallow marine sand Fox Canyon
Santa Barbara Formation:

Marine clay, sand, and gravel
Santa Barbara
Formation: Shallow
marine sand
Grimes Canyon
(upper member)
Tertiary Pliocene Pico Formation: Shale,
sandstone, and conglomerate
Fernando Group Non-Freshwater Bearing
Miocene
Santa Margarita and Modelo
Formations
Modelo Formation: Marine mudstones Monterey Formation
Topanga Formation and
Volcanics
Conejo Volcanics: Terrestrial and marine extrusive and intrusive igneous rocks
Oligocene/
Eocene
Older Rocks Sespe Formation: Sandstone and cobble conglomerate Note:
a As cited in DeVecchio et al. 2012a.
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-85
Table 2-2
Vertical Gradient
Location
Nested Group
(First 9 Digits of SWN)
Well
(Penultimate 2
Digits of SWN)
Screen Interval Spring 2015
Elevation
(ft msl)
Spring 2015
Gradient
(ft/ft)a
Fall 2015
Elevation
(ft msl)
Fall 2015
Gradient
(ft/ft)a Aquiferb Top Bottom
Forebay 02N22W23B 09 75 95 NA — 10.41 −0.643 Oxnard
08 135 155 −13.06 −0.057 −28.19 −0.019 Oxnard
07 260 300 −20.72 −0.012 −30.81 −0.028 Mugu
06 460 500 −23.2 −0.114 −36.43 −0.107 Hueneme
05 830 870 −65.53 −0.036 −75.84 −0.039 Hueneme
04 1,110 1,150 −75.59 −0.014 −86.77 0.032 Hueneme
03 1,210 1,250 −77 — −83.55 — Fox
Forebay 02N21W07L 06 135 155 8.2 −0.012 −12.07 −0.042 Mugu 04 500 540 3.88 −0.014 −27.9 0.022 Fox
03 640 700 1.84 — −24.59 — Fox
North - Coastal 01N23W01C 05 120 145 1.18 −0.040 −0.92 −0.048 Oxnard 04 630 695 −20.03 −0.009 −26.52 −0.010 Hueneme
03 965 1,065 −23.24 −0.014 −29.95 −0.010 Hueneme
02 1,390 1,490 −29.31 — −34.34 — Fox
Port Hueneme 01N22W20M 06 50 70 1.27 −0.071 1.8 −0.131 SemiPerched 05 150 170 −5.78 −0.004 −11.27 −0.002 Oxnard
04 280 300 −6.26 −0.033 −11.55 −0.039 Mugu
03 520 560 −14.6 −0.017 −21.3 −0.019 Hueneme
02 700 740 −17.57 −0.040 −24.8 −0.048 Hueneme
01 900 940 −25.65 −34.47 Fox
Port Hueneme 01N22W28G 5 180 200 −7.4 −0.009 −12.4 −0.016 Oxnard 4 255 275 −8.1 −0.030 −13.6 −0.032 Oxnard
3 720 760 −22.3 −0.039 −28.8 −0.051 Hueneme
2 995 1,095 −34.2 0.010 −44.2 0.019 Fox
1 1,295 1,395 −31.3 — −38.6 — GCA
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-86
Table 2-2
Vertical Gradient
Location
Nested Group
(First 9 Digits of SWN)
Well
(Penultimate 2
Digits of SWN)
Screen Interval Spring 2015
Elevation
(ft msl)
Spring 2015
Gradient
(ft/ft)a
Fall 2015
Elevation
(ft msl)
Fall 2015
Gradient
(ft/ft)a Aquiferb Top Bottom
Point Mugu 01N22W36K 09 175 195 −13.07 −0.110 −24.14 −0.156 Oxnard 08 310 330 −27.89 −0.220 −45.17 −0.561 Mugu
07 410 450 −52.06 −0.005 −106.82 −0.019 FCA
06 540 580 −52.71 −0.025 −109.32 −0.014 FCA
05 680 720 −56.26 — −111.34 — GCA
South/ Central 01N21W19L 14 18 38 11.97 −0.278 10.1 −0.331 SemiPerched 13 110 130 −13.63 −0.048 −20.33 −0.096 Oxnard
12 200 220 −17.93 −0.109 −28.96 −0.119 Oxnard
11 300 320 −28.85 −0.390 −40.87 −0.620 Mugu
10 394 414 −65.55 — −99.19 — FCA
South 01N21W32Q 06 275 285 −41.21 −0.278 −65 −0.468 Oxnard 07 180 220 −12.7 −0.356 −20.24 −0.560 Mugu
05 330 370 −60.7 −0.021 −97.74 −0.028 Mugu
04 600 640 −66.3 −0.047 −105.38 −0.044 FCA
03 800 840 −75.6 0.084 −114.17 0.084 GCA
02 930 970 −64.7 — −103.2 — GCA
Notes: FCA = Fox Canyon Aquifer; ft/ft = feet per feet; ft msl = feet above mean sea level; GCA = Grimes Canyon Aquifer; SWN = State Well Number. a Negative gradients are directed downward.
b The Oxnard and Mugu Aquifers compose the UAS, and the Hueneme, Fox, and Grimes Aquifers compose the LAS. Aquifer designations were provided by UWCD. 955
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-87
Table 2-3
Seawater/Saline Water Historical Reports and Studies
Title Author/Agency Date
Sea Water Intrusion, Oxnard Plain Ventura County California Department of Water Resources October 1965 Sea-Water Intrusion: Aquitards in the Coastal
Ground Water Basin of Oxnard Plain, Ventura
County
California Department of Water Resources,
Bulletin No. 63-4
September 1971
Oxnard Plain Groundwater Study State Water Resources Control Board March 1979 Chloride Sources in a California Aquifer John A. Izbicki, U.S. Geological Survey July 1991 A Study of Seawater Intrusion Using Direct-Current
Soundings in the Southeastern Part of the Oxnard
Plain, California
U.S. Geological Survey, Open File Report 93-
524
1993
Use of 18O and D to Define Seawater Intrusion John A. Izbicki, U.S. Geological Survey 1996 Simulation of Ground-Water/Surface-Water Flow in
the Santa Clara–Calleguas Ground-Water Basin,
Ventura County, California
Hanson et al., U.S. Geological Survey; Water
Resources Investigation Report 02-4136
2003
Mugu Seawater/Saline Water Intrusion Monitoring
Program: AB303 Grant, Agreement No.
4600004100
United Water Conservation District April 2007
2007 Update to the Fox Canyon Groundwater
Management Agency Management Plan
Fox Canyon Groundwater Management Agency 2007
Oxnard Plain Time Domain Electromagnetic Study
for Saline Intrusion
United Water Conservation District, Open-File
Report 2010-003
2010
Saline Intrusion Update, Oxnard Plain and
Pleasant Valley Basins
United Water Conservation District October 2016
Table 2-4
Basin Plan and FCGMA Water Quality Thresholds
for Groundwater in the Oxnard Subbasin
Threshold Source Sub-Area/Zone Description
Threshold Concentration (mg/L)
TDS Chloride Nitrate Sulfate Boron
LARWQCB Basin Plan
WQO
Oxnard Forebay and Confined
Aquifers
1,200 150 45 600 1
Unconfined and Perched
Aquifers
3,000 500 45 1,000 —
FCGMA 2007 BMO Oxnard Forebay 1,200 — 22.5 — —
Oxnard Plain — 150 — — —
Sources: LARWQCB 2013; FCGMA 2007.

Notes: BMO = Basin Management Objective; FCGMA = Fox Canyon Groundwater Management Agency; LARWQCB = Los Angeles Regional Water Quality Control Board; mg/L = milligrams per liter; TDS = total dissolved solids; WQO = Water Quality Objective. 956
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-88
Table 2-5
Modeled Surface Water Percolation from Streams in the Oxnard Subbasin Water Yeara Santa Clara River Percolation (acre-feet)b Calleguas Creek Percolation (acre-feet) 1986 8,466 4,423
1987 115 2,586
1988 10,402 3,572
1989 780 3,308
1990 943 2,140
1991 11,306 2,357
1992 18,255 5,290
1993 19,821 6,274
1994 3,303 3,468
1995 9,085 5,846
1996 560 3,687
1997 3,386 3,953
1998 3,922 6,760
1999 −4,404 3,699
2000 2,973 3,707
2001 4,225 4,770
2002 −521 3,341
2003 10,382 3,571
2004 3,913 1,873
2005 17,975 6,536
2006 −890 3,184
2007 47 1,802
2008 7,073 3,159
2009 4,281 2,617
2010 14,173 2,732
2011 10,803 3,763
2012 3,023 1,890
2013 −268 968
2014 5,821 819
2015 1,520 1,476
Average 5,682 3,452
Notes:
a Results presented are in water years, and will not match values presented in Section 2.4 text and Tables 2-7a through 2-7c, which are presented in calendar years.
b Negative numbers represent discharge of groundwater to the stream. 957
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-89
Table 2-6
Ecological Assets
Ecological Assets Lower Santa Clara River McGrath Lake Ormond Beach Wetlands Mugu Lagoon and Wetlands Lower Calleguas Creek Revolon Slough Locally important, specialstatus, rare, threatened, or endangered plants or animals
supported by the GDE
 Santa Ana sucker
 western pond turtle
 tidewater goby
 coast horned lizard
 white rabbit-tobacco
 southern riparian scrub
 least Bell’s vireo
(CDFW 2016)
 steelhead
 Belding’s savannah sparrow
 burrowing owl
 California least tern
 least Bell’s vireo
 salt marsh bird’s-beak
 sandy beach tiger beetle
 silvery legless lizard
 Ventura Marsh milk-vetch
(CDFW 2016)
 sandy beach tiger beetle
 brown pelican
 western least bittern
 white-faced ibis
 osprey
 white-tailed kite
 northern harrier
 sharp-shinned hawk
 Cooper’s hawk
 light-footed clapper rail
 western snowy plover
 long-billed curlew
 California least tern
 western yellow-billed cuckoo
 burrowing owl
 southwestern willow flycatcher
 loggerhead shrike
 least Bell’s vireo
 yellow warbler
 yellow-breasted chat
 Belding’s savannah sparrow
 California red-legged frog
 southwestern pond turtle
 silvery legless lizard
 San Diego horned lizard
 two-striped garter snake
 south coast garter snake
 Townsend’s big-eared bat
(ESA 2003, Table 3-2)
 Belding’s savannah sparrow
 California least tern
 Coulter’s goldfields
 California brackish water snail
 salt marsh bird’s-beak
 tidewater goby
 western snowy plover
(CDFW 2016)
 western snowy plover
 California least tern
 California brown pelican
 light-footed clapper rail
 least Bell’s vireo
 Southern California saltmarsh shrew
 San Diego black-tailed jackrabbit
 double-crested cormorant
 American bittern
 great blue heron
 great egret
 snowy egret
 black-crowned night heron
 white-faced ibis
 white-tailed kite
 northern harrier
 Cooper’s hawk
 sharp-shinned hawk
 merlin
 mountain plover
 long-billed curlew
 western burrowing owl
 loggerhead shrike
 yellow warbler
 California horned lark
 tricolored blackbird
 south coast garter snake
 tiger beetle
 sandy beach tiger beetle
 wandering skipper
 globose dune beetle
 red sand-verbena
 spiny rush
 woolly seablite
(WRA 2007)
 arroyo chub
 Belding’s savannah sparrow
 burrowing owl
 California brown pelican
 California least tern
 Coulter’s goldfields
 estuary seablite
 ferruginous hawk
 globose dune beetle
 least Bell’s vireo
 light-footed clapper rail
 salt marsh bird’s-beak
 sandy beach tiger beetle
 senile tiger beetle
 southern coastal salt marsh
 tidewater goby
 wandering (=saltmarsh) skipper
 western snowy plover
(CDFW 2016)
 peregrine falcon
 arroyo chub
 two-striped gartersnake
 least Bell’s vireo
(CDFW 2016)
 arroyo chub
(CDFW 2016)
 least Bell’s vireo
(Appendix K)
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-90
Table 2-6
Ecological Assets
Ecological Assets Lower Santa Clara River McGrath Lake Ormond Beach Wetlands Mugu Lagoon and Wetlands Lower Calleguas Creek Revolon Slough Important or critical habitat
provided for native species
(USFWS 2016b)
 southwestern willow flycatcher critical
habitat (569 acres)
 tidewater goby critical habitat (22 acres)
 western snowy plover critical habitat (35
acres)
 steelhead critical habitat
 Audubon California Important Bird Area
 southwestern willow flycatcher critical
habitat (32 acres)
 tidewater goby critical habitat (18 acres)
 Ventura Marsh milk-vetch critical habitat
(78 acres)
 Audubon California Important Bird Area
 tidewater goby critical habitat (88 acres)
 western snowy plover critical habitat (26
acres)
 Audubon California Important Bird Area
 western snowy plover critical habitat (51
acres)
 Wetland of Regional Importance in the
Western Hemisphere Shorebird Reserve
Network
 Essential Fish Habitat (EFH) and Habitat
Areas of Particular Concern (HAPC) are
designated for Pacific Coast groundfish
and coastal pelagic species in the
nearshore marine and estuarine habitats
 Laguna Point to Latigo Point Area of
Special Biological Significance
 Audubon California Important Bird Area
None None
Portion of GDE that is a
recognized wetland (USFWS
2016a; Appendix K)
1,180 acres (93%) 197 acres (71%) 207 acres (96%) 5,943 acres (93%) 6 acres (4%) 2 acres (8%) Protected area, locally important
conservation or wildlife corridor
plan areas within the GDE
 The Nature Conservancy (160 acres)
 City of Ventura (1.2 acres)
 McGrath State Beach (56 acres)
 Mandalay State Beach (29 acres)
 Mandalay County Park (0.7 acres)
 The Nature Conservancy (129 acres)
 Port Hueneme Beach Park (1.3 acres)
 Point Mugu State Park (0.1 acres) None None
List any environmental
beneficial uses designated in
the RWQCB Basin Plan for the
surface water found in the
groundwater basin.
 Wildlife Habitat (WILD)
 Rare, Threatened, or Endangered Species
(RARE)
 Migration of Aquatic Organisms (MIGR)
 Spawning, Reproduction, and/or Early
Development (SPWN)
 Wetlands (WET)
Also REC1, REC2
 Estuarine Habitat (EST)
 Wildlife Habitat (WILD)
 Rare, Threatened, or Endangered Species
(RARE)
 Wetlands (WET)
Also REC1, REC2
 Estuarine Habitat (EST)
 Wildlife Habitat (WILD)
 Rare, Threatened, or Endangered Species
(RARE)
 Wetlands (WET)
Also, REC1, REC2
 Estuarine Habitat (EST)
 Marine Habitat (MAR)
 Wildlife Habitat (WILD)
 Preservation of Biological Habitats of
Special Significance (BIOL)
 Rare, Threatened, or Endangered Species
(RARE)
 Migration of Aquatic Organisms (MIGR)
 Spawning, Reproduction, and/or Early
Development (SPWN)
 Shellfish Harvesting (SHELL)
 Wetlands (WET)
Also REC1 (potential), REC2
Reach 2:
 WARM
 COLD
 Wildlife Habitat (WILD)
 Rare, Threatened, or
Endangered Species (RARE)
 Wetlands (WET)
Also REC1, REC2
Reach 4 (Revolon Slough):
 WARM
 Wildlife Habitat (WILD)
 Wetlands (WET)
Also REC1, REC2
Is the GDE area composed of
>30% native vegetation?
(Appendix K)
Yes Yes Yes Yes Yes Yes
Sources: CDFW 2016; GreenInfo Network 2016; USFWS 2016a, 2016b; Appendix K; WRA 2007; ESA 2003. 959
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-91
Table 2-7a
Groundwater Recharge and Discharge in the Semi-Perched Aquifer Calendar
Yeara
Groundwater Recharge (AF) Groundwater Discharge (AF)
Storage Change
(AF)
Stream Leakage(Santa Clara River in Oxnard Forebay)RechargeSubsurface Inflow from PVBUnincorporated AreasSubsurface Inflow from West LPVBSubsurface Inflow from the UASSum of Coastal Flux from Arnold Road to Point MuguCoastal flux from Channel Islands Harbor to Arnold RoadStream LeakageCalleguas CreekTotal InflowPumpingTile DrainsSubsurface Outflow to UASGroundwater Discharge to Streams(Santa Clara River in Oxnard Forebay) Evapotranspiration
Unincorporated AreasSubsurface Outflow to West LPVBCoastal Flux North to Channel Islands HarborCoastal flux from Channel Islands Harbor to Arnold RdSubsurface Outflow to Mound Basin Total
Outflow
Change in
Groundwater
Storage
b
1985 0 23,081 1,525 152 0 0 843 0 2,592 28,192 −44 −2,983 −15,889 −404 −5,765 0 −374 −2,076 −266 −1,247 −29,050 857 1986 1,133 28,960 1,720 59 0 0 632 0 4,243 36,748 −65 −6,579 −13,989 0 −8,312 0 −66 −1,789 −235 −844 −31,879 −4,869 1987 0 24,587 1,780 16 0 0 672 0 3,097 30,153 −65 −5,886 −18,182 −407 −7,100 0 −335 −1,628 −243 −626 −34,472 4,319 1988 1,021 23,162 1,758 0 0 0 658 0 3,236 29,836 −61 −5,715 −17,824 0 −7,138 −25 −72 −1,442 −206 −622 −33,105 3,269 1989 0 20,613 1,641 0 0 0 667 0 3,146 26,068 −73 −4,848 −19,673 −245 −6,582 −57 −10 −1,315 −188 −451 −33,441 7,373 1990 0 18,731 1,312 0 0 0 701 0 1,901 22,645 −141 −3,032 −22,805 −136 −5,008 −89 0 −1,076 −176 −362 −32,825 10,180 1991 1,857 26,208 1,074 0 0 0 652 0 2,526 32,316 −128 −2,856 −23,955 0 −5,207 −107 −2 −854 −119 −470 −33,698 1,382 1992 4,382 28,816 1,448 0 0 0 567 0 5,661 40,875 −92 −5,605 −19,636 0 −7,684 −84 −47 −773 −25 −645 −34,589 −6,285 1993 3,165 29,069 2,161 0 8 0 552 21 6,209 41,186 −70 −8,637 −8,873 0 −9,404 −25 0 −950 0 −594 −28,553 −12,633 1994 42 21,586 2,249 0 0 0 668 0 3,240 27,784 −89 −7,101 −6,674 0 −7,680 −5 −349 −1,219 −12 −607 −23,735 −4,048 1995 1,563 31,175 3,070 53 105 2,351 558 0 6,037 44,912 −55 −13,095 0 0 −10,618 0 0 −1,449 −85 −609 −25,912 −19,001 1996 521 25,153 3,281 58 0 0 650 0 4,168 33,831 −27 −12,061 −1,148 0 −9,283 0 −223 −1,592 −105 −892 −25,332 −8,498 1997 0 26,109 3,628 69 0 0 652 0 4,050 34,508 −20 −14,177 −6,733 −187 −9,647 0 −266 −1,821 −200 −855 −33,905 −602 1998 598 32,461 4,336 134 811 5,986 542 0 6,184 51,052 −6 −20,912 0 0 −12,445 0 0 −2,006 −257 −575 −36,199 −14,852 1999 0 19,869 4,254 94 0 0 680 0 3,506 28,404 −10 −15,444 −3,958 −585 −9,755 0 −392 −2,008 −244 −975 −33,371 4,967 2000 0 22,718 4,259 69 0 0 660 0 3,706 31,412 −11 −15,051 −8,528 −360 −9,840 0 −342 −2,128 −321 −836 −37,418 6,006 2001 0 27,888 4,414 87 0 0 611 0 4,974 37,974 −8 −17,135 −3,472 −18 −10,797 0 −41 −2,073 −324 −720 −34,589 −3,385 2002 0 19,479 4,219 60 0 0 686 0 3,562 28,007 0 −12,918 −10,775 −199 −8,925 0 −455 −1,944 −299 −779 −36,294 8,287 2003 624 20,846 4,207 62 0 0 664 0 2,610 29,012 0 −13,054 −9,433 0 −9,096 0 −125 −1,897 −290 −755 −34,649 5,637 2004 1,268 23,658 4,131 50 0 0 683 0 3,262 33,052 0 −11,527 −13,653 0 −8,265 0 −59 −1,791 −293 −646 −36,234 3,182 2005 2,113 26,133 4,668 91 430 0 581 0 5,453 39,468 0 −16,632 −625 0 −10,950 0 0 −1,681 −232 −548 −30,668 −8,800 2006 406 22,032 4,622 75 56 2,744 681 0 2,975 33,590 0 −14,711 0 0 −9,156 0 0 −1,697 −189 −794 −26,547 −7,043 2007 0 17,401 4,673 40 0 0 726 0 1,982 24,822 0 −12,812 −9,238 −533 −7,984 0 −626 −1,809 −222 −812 −34,036 9,213 2008 595 21,781 4,791 45 0 0 680 0 3,613 31,505 0 −13,449 −9,365 0 −8,859 0 −156 −1,812 −254 −689 −34,584 3,079 2009 789 19,847 4,711 46 0 0 696 0 2,370 28,458 0 −12,256 −10,893 0 −8,129 0 −157 −1,685 −235 −622 −33,978 5,521 2010 1,851 27,065 4,706 72 0 0 652 0 2,737 37,083 0 −13,439 −10,338 0 −8,689 0 −59 −1,613 −229 −655 −35,022 −2,060 2011 1,022 20,056 4,774 85 0 0 644 0 3,648 30,229 0 −14,172 −3,689 0 −9,306 0 −10 −1,513 −177 −638 −29,506 −723 2012 115 17,308 4,651 59 0 0 720 0 1,813 24,665 0 −11,317 −7,982 0 −7,644 0 −203 −1,498 −166 −622 −29,431 4,766 2013 0 14,694 4,237 23 0 0 745 0 437 20,136 0 −8,415 −13,937 −234 −6,478 0 −17 −1,483 −212 −539 −31,316 11,180 2014 809 18,636 3,467 −9 0 0 720 0 1,489 25,112 0 −6,185 −19,272 0 −5,952 −9 0 −1,358 −257 −534 −33,567 8,446 960
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-92
Table 2-7a
Groundwater Recharge and Discharge in the Semi-Perched Aquifer Calendar
Yeara
Groundwater Recharge (AF) Groundwater Discharge (AF)
Storage Change
(AF)
Stream Leakage(Santa Clara River in Oxnard Forebay)RechargeSubsurface Inflow from PVBUnincorporated AreasSubsurface Inflow from West LPVBSubsurface Inflow from the UASSum of Coastal Flux from Arnold Road to Point MuguCoastal flux from Channel Islands Harbor to Arnold RoadStream LeakageCalleguas CreekTotal InflowPumpingTile DrainsSubsurface Outflow to UASGroundwater Discharge to Streams(Santa Clara River in Oxnard Forebay) Evapotranspiration
Unincorporated AreasSubsurface Outflow to West LPVBCoastal Flux North to Channel Islands HarborCoastal flux from Channel Islands Harbor to Arnold RdSubsurface Outflow to Mound Basin Total
Outflow
Change in
Groundwater
Storage
b
2015 0 13,543 2,760 −36 0 0 721 0 801 17,790 −2 −4,451 −18,043 −80 −5,322 0 0 −1,048 −177 −401 −29,524 11,734 Maximum 4,382 32,461 4,791 152 811 5,986 843 21 6,209 51,052 0 −2,856 0 0 −5,008 0 0 −773 0 −362 −23,735 11,734 Minimum 0 13,543 1,074 −36 0 0 542 0 437 17,790 −141 −20,912 −23,955 −585 −12,445 −107 −626 −2,128 −324 −1,247 −37,418 −19,001 Average 770 22,989 3,372 47 45 357 663 1 3,394 31,639 −31 −10,531 −10,600 −109 −8,291 −13 −141 −1,582 −201 −676 −32,175 535 Notes: AF = acre-feet; LPVB = Las Posas Valley Basin; PVB = Pleasant Valley Basin; UAS = Upper Aquifer System. a Results from these tables are in calendar years, and will not exactly match data in Table 2−5 and Sections 2.3.2 and 2.3.6, which are presented in water years. b A negative number indicates that water entered storage.

Table 2-7b
Groundwater Recharge and Discharge in the Upper Aquifer System Calendar
Yeara
Groundwater Recharge (AF) Groundwater Discharge (AF)
Storage
Change
(AF)
Stream Leakage (Santa Clara River in Oxnard Forebay)Volcanic OutcropsRechargeSubsurface Inflow from PVBUnincorporated AreasSubsurface Inflow from the Semi-Perched AquiferSubsurface Inflow from Santa Paula BasinSubsurface Inflow from West LPVBCoastal Flux north to Channel Islands HorborCoastal flux from Channel Islands Harbor to Arnold RdSum of Coastal Flux from Arnold Rd to Point MuguSubsurface Inflow from the Mound BasinTotal InflowPumpingTile DrainsSubsurface Outflow to theSemi-Perched AquiferSubsurface Outflow to LASSubsurface Outflow to West LPVBGroundwater Discharge to Streams (Santa Clara River in Oxnard Forebay) Evapotranspiration
Unincorporated AreasSubsurface Outflow to the Santa Paula BasinSubsurface Outflow to PVBCoastal Flux north to Channel Islands HarborCoastal flux from Channel Islands Harbor to Arnold RdSubsurface Outflow to Mound BasinTotal OutflowChange in Groundwater Storage b
1985 737 5 36,262 0 430 15,889 0 963 742 1,415 2,408 3,014 61,865 −71,157 −356 0 −21,581 0 0 0 0 −1,020 −1,551 0 0 0 −95,665 33,800 1986 6,880 17 63,061 0 0 13,989 0 0 1,254 1,454 2,316 2,227 91,198 −64,234 0 0 −20,735 −2,629 0 0 −52 −968 −613 0 0 0 −89,230 −1,968 1987 1,271 8 35,362 0 431 18,182 0 0 3,076 2,312 3,128 4,181 67,951 −67,347 0 0 −23,240 −137 0 0 0 −744 −15 0 0 0 −91,483 23,532 1988 9,147 8 42,938 142 136 17,824 2,145 0 3,434 2,458 3,150 1,233 82,614 −63,663 0 0 −24,847 −2,053 0 0 0 0 0 0 0 0 −90,563 7,949 1989 530 2 19,007 588 412 19,673 0 0 5,376 2,977 3,402 3,046 55,012 −61,443 0 0 −26,103 −778 0 0 0 −524 0 0 0 0 −88,848 33,835 1990 1,095 2 11,112 1,153 397 22,805 544 0 7,476 3,914 4,095 2,259 54,853 −57,820 0 0 −30,731 −109 0 0 0 0 0 0 0 0 −88,661 33,807 1991 10,696 15 42,247 956 0 23,955 2,244 0 7,221 3,974 4,092 463 95,863 −49,646 0 0 −27,671 −2,705 0 0 −9 0 0 0 0 0 −80,031 −15,832 1992 16,092 22 104,442 0 0 19,636 3,089 0 4,412 2,769 3,084 0 153,544 −45,853 0 0 −24,091 −7,151 0 0 −592 0 −73 0 0 −4,193 −81,953 −71,591 1993 13,448 19 97,426 0 0 8,873 2,372 0 287 1,145 2,051 0 125,620 −47,504 0 0 −25,390 −8,460 0 0 −194 0 −2,107 0 0 −5,603 −89,259 −36,360 1994 2,931 6 52,967 0 394 6,674 837 0 221 857 1,768 0 66,656 −49,868 0 0 −24,598 −4,155 0 0 0 0 −1,808 0 0 −422 −80,853 14,197 1995 8,600 25 102,350 0 0 0 1,039 0 0 133 1,212 0 113,359 −39,520 −292 −2,351 −24,364 −7,649 0 −127 −384 0 −1,346 −1,750 0 −4,568 −82,352 −31,008 961
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-93
Table 2-7b
Groundwater Recharge and Discharge in the Upper Aquifer System Calendar
Yeara
Groundwater Recharge (AF) Groundwater Discharge (AF)
Storage
Change
(AF)
Stream Leakage (Santa Clara River in Oxnard Forebay)Volcanic OutcropsRechargeSubsurface Inflow from PVBUnincorporated AreasSubsurface Inflow from the Semi-Perched AquiferSubsurface Inflow from Santa Paula BasinSubsurface Inflow from West LPVBCoastal Flux north to Channel Islands HorborCoastal flux from Channel Islands Harbor to Arnold RdSum of Coastal Flux from Arnold Rd to Point MuguSubsurface Inflow from the Mound BasinTotal InflowPumpingTile DrainsSubsurface Outflow to theSemi-Perched AquiferSubsurface Outflow to LASSubsurface Outflow to West LPVBGroundwater Discharge to Streams (Santa Clara River in Oxnard Forebay) Evapotranspiration
Unincorporated AreasSubsurface Outflow to the Santa Paula BasinSubsurface Outflow to PVBCoastal Flux north to Channel Islands HarborCoastal flux from Channel Islands Harbor to Arnold RdSubsurface Outflow to Mound BasinTotal OutflowChange in Groundwater Storage b
1996 2,598 15 56,775 0 128 1,148 310 0 0 0 960 0 61,935 −35,068 −734 0 −22,583 −4,454 0 −119 0 0 −1,375 −2,233 −202 −401 −67,168 5,233 1997 2,300 14 54,861 0 221 6,733 0 0 0 181 1,231 1,123 66,666 −52,122 −532 0 −23,393 −3,560 0 −30 0 −387 −407 −1,139 0 0 −81,568 14,902 1998 0 26 122,199 0 0 0 0 0 0 0 509 0 122,734 −43,078 −967 −5,986 −21,766 −8,501 −663 −420 −625 −4,282 −67 −2,733 −589 −1,247 −90,925 −31,809 1999 0 5 37,762 0 529 3,958 0 0 0 0 639 1,413 44,305 −48,269 −1,180 0 −18,830 −1,847 −2,309 −131 0 −1,162 −106 −2,688 −590 0 −77,113 32,807 2000 3,677 9 54,044 1,084 0 8,528 0 0 0 90 1,047 749 69,228 −45,561 −454 0 −20,784 −2,743 0 0 −38 −500 0 −852 0 0 −70,931 1,704 2001 3,944 19 77,935 1,233 0 3,472 0 0 0 9 949 0 87,561 −42,551 −457 0 −20,746 −4,589 0 0 −69 −1,091 0 −1,447 0 −2,070 −73,019 −14,543 2002 3,129 7 22,151 1,150 432 10,775 1,237 0 0 427 1,191 861 41,360 −44,571 −191 0 −21,202 −1,420 0 0 0 0 0 −319 0 0 −67,703 26,344 2003 7,334 10 36,230 1,803 120 9,433 3,016 0 156 476 1,098 0 59,677 −47,327 0 0 −18,335 −2,591 0 0 0 0 0 0 0 −342 −68,596 8,919 2004 9,742 15 25,471 2,485 149 13,653 3,421 0 1,766 1,170 1,513 86 59,471 −46,670 0 0 −19,410 −2,397 0 0 0 0 0 0 0 0 −68,477 9,006 2005 8,009 18 121,368 1,757 0 625 0 0 0 219 937 0 132,932 −41,034 −222 0 −23,873 −10,233 0 −86 −615 −1,174 0 −1,101 0 −5,909 −84,247 −48,685 2006 0 10 82,755 1,283 72 0 0 0 0 0 665 0 84,785 −42,858 −1,041 −2,744 −22,640 −6,474 −1,416 −244 0 −3,135 0 −2,273 −301 −3,285 −86,411 1,626 2007 1,031 3 31,445 2,419 404 9,238 0 0 0 107 901 828 46,376 −54,564 −430 0 −18,531 −1,122 0 0 0 −683 0 −786 0 0 −76,116 29,740 2008 6,446 11 58,687 3,135 0 9,365 0 0 71 537 1,138 0 79,389 −51,775 −5 0 −21,473 −4,242 0 0 −52 −25 0 0 0 −405 −77,978 −1,412 2009 7,141 7 24,406 3,515 283 10,893 2,661 0 960 815 1,174 259 52,114 −51,431 0 0 −18,696 −1,734 0 0 0 0 0 0 0 0 −71,861 19,748 2010 12,155 20 48,796 3,938 32 10,338 3,016 0 834 785 1,134 0 81,048 −44,145 0 0 −17,864 −3,033 0 0 0 0 0 0 0 −1,365 −66,407 −14,641 2011 5,847 8 73,711 3,049 0 3,689 0 0 0 301 930 0 87,535 −41,608 0 0 −20,530 −6,136 0 0 −216 −244 0 −758 0 −2,941 −72,434 −15,101 2012 2,878 4 22,461 3,162 348 7,982 1,122 0 0 401 1,067 905 40,330 −43,460 0 0 −19,728 −2,338 0 0 0 0 0 −278 0 0 −65,803 25,472 2013 0 0 4,132 3,767 342 13,937 0 0 2,121 1,383 1,803 2,546 30,032 −44,900 0 0 −20,628 −1,388 0 0 0 −27 0 0 0 0 −66,943 36,911 2014 6,504 6 4,860 4,552 229 19,272 2,448 0 4,573 2,641 2,793 2,205 50,084 −43,012 0 0 −24,557 −1,603 0 0 0 0 0 0 0 0 −69,172 19,089 2015 506 1 3,843 4,639 186 18,043 357 0 5,641 3,037 2,955 2,145 41,354 −42,177 0 0 −21,886 −1,304 0 0 0 0 0 0 0 0 −65,367 24,013 Maximum 16,092 26 122,199 4,639 529 23,955 3,421 963 7,476 3,974 4,095 4,181 153,544 −35,068 0 0 −17,864 0 0 0 0 0 0 0 0 0 −65,367 36,911 Minimum 0 0 3,843 0 0 0 0 0 0 0 509 0 30,032 −71,157 −1,180 −5,986 −30,731 −10,233 −2,309 −420 −625 −4,282 −2,107 −2,733 −590 −5,909 −95,665 −71,591 Average 4,989 11 50,680 1,478 183 10,600 963 31 1,601 1,161 1,785 953 74,434 −49,169 −221 −357 −22,284 −3,469 −142 −37 −92 −515 −305 −592 −54 −1,056 −78,295 3,861 Notes: AF = acre-feet; LAS = Lower Aquifer System; LPVB = Las Posas Valley Basin; PVB = Pleasant Valley Basin. a Results from these tables are in calendar years, and will not exactly match data in Table 2-5 and Sections 2.3.2 and 2.3.6, which are presented in water years. b A negative number indicates that water entered storage. 962
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-94
Table 2-7c
Groundwater Recharge and Discharge in the Lower Aquifer System Calendar
Yeara
Groundwater Recharge (AF) Groundwater Discharge (AF) Storage Change (AF) Subsurface
Inflow from
PVB
Subsurface
Inflow from
the UAS
Unincorporated
Areas
Subsurface
Inflow from
Santa Paula
Basin
Subsurface
Inflow from
West LPVB
Coastal Flux
north to
Channel
Islands Harbor
Coastal flux from
Channel Islands
Harbor to Arnold
Road
Sum of Coastal
Flux from
Arnold Road to
Point Mugu
Subsurface
Inflow from
the Mound
Basin
Total
Inflow Pumping
Subsurface
Outflow to
West LPVB
Subsurface
Outflow to
Santa Paula
Basin
Subsurface
Outflow to
PVB
Total
Outflow
Change in
Groundwater Storage
b
1985 0 21,581 81 0 292 2,954 1,763 1,016 2,014 29,702 −34,579 0 −123 −100 −34,802 5,100 1986 285 20,735 162 0 0 2,900 1,689 899 2,482 29,151 −28,475 −292 −162 0 −28,929 −223 1987 1,146 23,240 71 0 1,091 4,005 2,176 1,185 2,687 35,601 −38,471 0 −1 0 −38,473 2,872 1988 710 24,847 109 0 470 4,187 2,203 1,183 2,272 35,981 −37,023 0 −53 0 −37,076 1,094 1989 43 26,103 77 6 1,569 4,989 2,386 1,210 3,279 39,663 −44,754 0 0 0 −44,754 5,091 1990 1,027 30,731 93 130 1,838 6,233 2,890 1,450 3,174 47,566 −51,926 0 0 0 −51,926 4,359 1991 0 27,671 132 133 911 5,865 2,811 1,392 2,356 41,272 −37,084 0 0 −491 −37,575 −3,698 1992 0 24,091 223 120 0 4,288 2,198 1,070 1,033 33,023 −23,641 −1,474 0 −1,073 −26,188 −6,835 1993 0 25,390 217 63 0 2,764 1,733 964 1,829 32,960 −25,392 −2,170 0 −1,205 −28,767 −4,192 1994 0 24,598 121 48 0 2,964 1,763 952 1,937 32,383 −32,806 −719 0 −263 −33,789 1,406 1995 0 24,364 161 57 0 2,126 1,476 848 2,150 31,184 −24,584 −1,393 0 −235 −26,212 −4,972 1996 0 22,583 125 16 0 1,763 1,351 772 2,031 28,642 −27,440 −866 0 −117 −28,423 −220 1997 167 23,393 118 0 0 2,273 1,604 885 2,679 31,120 −32,248 −557 −28 0 −32,832 1,712 1998 109 21,766 194 0 0 1,114 1,130 656 3,186 28,156 −21,883 −2,093 −13 0 −23,989 −4,167 1999 116 18,830 89 0 0 977 1,132 742 1,285 23,171 −26,844 −834 −77 0 −27,755 4,584 2000 546 20,784 90 0 0 1,814 1,392 886 1,856 27,368 −27,819 −450 −27 0 −28,295 927 2001 1,030 20,746 118 0 0 1,784 1,388 882 1,361 27,310 −23,661 −620 −2 0 −24,282 −3,028 2002 913 21,202 63 14 470 2,483 1,631 875 1,961 29,612 −33,324 0 0 0 −33,324 3,712 2003 210 18,335 61 59 36 2,124 1,444 814 1,906 24,989 −24,017 0 0 0 −24,017 −972 2004 353 19,410 59 39 529 3,060 1,796 888 1,917 28,052 −30,513 0 0 0 −30,513 2,461 2005 819 23,873 211 0 0 1,959 1,426 733 2,961 31,983 −25,225 −1,799 −9 0 −27,033 −4,950 2006 1,430 22,640 120 0 0 1,436 1,284 696 2,672 30,278 −28,316 −999 −83 0 −29,398 −880 2007 1,266 18,531 57 0 0 1,565 1,299 705 2,349 25,772 −27,854 −55 −108 0 −28,016 2,244 2008 1,608 21,473 133 0 195 2,139 1,482 751 2,862 30,643 −30,891 0 −41 0 −30,933 290 2009 1,657 18,696 67 8 772 2,338 1,538 715 2,727 28,519 −30,458 0 0 0 −30,458 1,940 2010 1,162 17,864 103 126 0 2,171 1,402 660 2,719 26,208 −23,680 −136 0 0 −23,816 −2,393 2011 1,618 20,530 143 21 0 1,785 1,359 699 2,725 28,881 −26,984 −1,115 0 0 −28,099 −782 2012 1,431 19,728 71 9 463 2,032 1,405 666 2,864 28,670 −31,169 0 0 0 −31,169 2,500 2013 1,499 20,628 56 0 1,061 3,111 1,853 857 2,921 31,986 −39,159 0 −1 0 −39,160 7,175 2014 1,346 24,557 63 109 1,681 4,593 2,441 1,060 3,150 39,000 −39,905 0 0 0 −39,905 905 2015 1,420 21,886 86 113 1,264 4,690 2,343 1,038 2,838 35,679 −38,635 0 0 0 −38,635 2,956 Maximum 1,657 30,731 223 133 1,838 6,233 2,890 1,450 3,279 47,566 −21,883 0 0 0 −23,816 7,175 Minimum 0 17,864 56 0 0 977 1,130 656 1,033 23,171 −51,926 −2,170 −162 −1,205 −51,926 −6,835 Average 707 22,284 112 35 408 2,854 1,735 908 2,393 31,436 −31,250 −502 −24 −112 −31,888 452 Notes: AF = acre-feet; LPVB = Las Posas Valley Basin; PVB = Pleasant Valley Basin; UAS = Upper Aquifer System. a Results from these tables are in calendar years, and will not exactly match data in Table 2-5 and Sections 2.3.2 and 2.3.6, which are presented in water years. b A negative number indicates that water entered storage. 963
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-95
Table 2-8
UWCD Diversions and Usage of Santa Clara River Water (AF) Calendar Year
Freeman
Diversion
Recharge in Oxnard
Forebay Spreading
Grounds
PTP Supply Line
Deliveries (To Oxnard
Subbasin Only)
PVP Supply Line Deliveries to
Oxnard Subbasin and Pleasant
Valley Basina
1985 42,802 33,837 0 8,738
1986 69,805 59,810 35 9,851
1987 37,638 32,825 2,492 4,560
1988 49,128 40,571 3,709 6,922
1989 24,123 16,920 6,653 5,702
1990 9,553 8,892 9,762 319
1991 44,646 39,289 7,827 1,674
1992 118,151 101,421 7,622 9,320
1993 117,937 94,241 8,462 15,294
1994 71,238 50,588 9,005 12,336
1995 121,235 98,952 8,616 14,014
1996 70,280 54,047 9,513 9,356
1997 71,115 52,006 9,631 11,375
1998 142,279 118,672 7,681 16,064
1999 56,401 35,816 9,017 12,856
2000 71,868 51,793 9,155 11,682
2001 97,061 75,176 6,223 15,635
2002 31,144 20,209 8,632 6,055
2003 47,630 34,111 7,464 6,311
2004 34,160 23,166 8,389 5,245
2005 138,246 118,629 6,470 13,047
2006 101,592 80,554 8,125 12,495
2007 46,430 29,703 8,806 9,908
2008 71,933 56,433 9,639 11,333
2009 40,872 22,438 9,180 14,589
2010 64,005 46,228 7,177 11,555
2011 92,119 71,959 8,700 12,672
2012 37,036 20,816 8,129 10,182
2013 8,941 2,686 8,691 3,230
2014 4,501 2,900 6,644 199
2015 2,607 2,516 5,476 0
Maximum 142,279 118,672 9,762 16,064
Minimum 2,607 2,516 0 0
Average 62,467 48,297 7,320 9,114
Note:
a For water supplied by the UWCD PVP to PVCWD, 56% is used in the Oxnard Subbasin and 44% in the Pleasant Valley Basin; only the 56% used in the Oxnard Subbasin is shown in this table. 964
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-96
Table 2-9
United Water Conservation District Water (AF)
Calendar Year
Recharge to
Saticoy
Recharge to
Noble
Recharge to
El Rio Total Recharge
1985 19,909 0 13,928 33,837
1986 43,407 0 16,403 59,810
1987 16,152 0 16,673 32,825
1988 21,496 0 19,075 40,571
1989 9,729 0 7,192 16,920
1990 3,308 0 5,584 8,892
1991 23,306 0 15,982 39,289
1992 55,606 0 45,815 101,421
1993 45,064 0 49,177 94,241
1994 17,982 0 32,606 50,588
1995 35,419 10,657 52,876 98,952
1996 25,608 3,806 24,633 54,047
1997 22,323 4,412 25,271 52,006
1998 56,935 18,710 43,027 118,672
1999 16,539 1,285 17,992 35,816
2000 28,620 0 23,173 51,793
2001 26,918 8,824 39,434 75,176
2002 5,291 32 14,886 20,209
2003 7,158 44 26,909 34,111
2004 8,105 0 15,061 23,166
2005 46,872 19,490 52,267 118,629
2006 29,005 10,709 40,840 80,554
2007 11,404 99 18,200 29,703
2008 28,631 8,562 19,240 56,433
2009 9,215 0 13,223 22,438
2010 15,108 995 30,125 46,228
2011 23,435 10,679 37,845 71,959
2012 3,985 538 16,293 20,816
2013 34 263 2,389 2,686
2014 387 578 1,935 2,900
2015 1,231 0 1,285 2,516
Maximum 56,935 19,490 52,876 118,672
Minimum 34 0 1,285 2,516
Average 21,232 3,216 23,850 48,297
965
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-97
Table 2-10
Summary of Water Deliveries
Calendar
Year
PVCWD (AF)a United Water Conservation District (AF)
Total UWCD
and PVCWD
Water
Deliveries in
Oxnard
Subbasin (AF)
Conejo Creek
Flows Delivered
by CWD for
Agricultureb
Pumped
Groundwater
from Oxnard
Subbasin Basin
Total
PVCWD
Water
Delivered
PTP (Oxnard Subbasin Only) O-H Supply Line (Oxnard Subbasin Only) PVP (Oxnard Subbasin and Pleasant Valley Basin) c
PTP
Wells 1–5
(LAS)
Saticoy
Wells
(UAS)
Total PTP
Groundwater
Pumpage
Total PTP
Surface
Water
Total PTP
Water
Municipal
Deliveries
Agriculture
Deliveries
Total O-H
Water
Diversions of Santa
Clara River Water Used
in the Oxnard Subbasin
for Agriculture
Recharged Spreading
Water Pumped and
Used in the Oxnard
Subbasin for Agriculture
(Saticoy Wells)
d
Total PVP
Water
1985 0 −170 −170 0 0 0 0 0 13,901 0 13,901 4,893 0 4,893 18,624 1986 0 −282 −282 0 0 0 35 35 14,096 0 14,096 5,517 0 5,517 19,366 1987 0 −231 −231 2,321 0 2,321 171 2,492 15,364 0 15,364 2,554 0 2,554 20,179 1988 0 387 387 2,184 0 2,184 1,525 3,709 15,513 0 15,513 3,876 0 3,876 23,486 1989 0 121 121 5,301 0 5,301 1,352 6,653 14,494 0 14,494 3,193 0 3,193 24,462 1990 0 273 273 9,506 0 9,506 256 9,762 14,757 0 14,757 179 0 179 24,971 1991 0 708 708 5,042 0 5,042 2,785 7,827 12,644 0 12,644 938 0 938 22,117 1992 0 −604 −604 989 0 989 6,633 7,622 12,669 0 12,669 5,219 0 5,219 24,906 1993 0 −197 −197 825 0 825 7,637 8,462 14,977 0 14,977 8,565 0 8,565 31,807 1994 0 −369 −369 1,564 0 1,564 7,441 9,005 13,092 0 13,092 6,908 0 6,908 28,635 1995 0 −308 −308 1,128 0 1,128 7,488 8,616 8,664 0 8,664 7,848 0 7,848 24,820 1996 0 −1,007 −1,007 3,264 0 3,264 6,249 9,513 6,881 0 6,881 5,239 0 5,239 20,627 1997 0 −425 −425 2,389 0 2,389 7,242 9,631 17,776 0 17,776 6,370 0 6,370 33,351 1998 0 107 107 511 0 511 7,170 7,681 16,784 0 16,784 8,996 0 8,996 33,567 1999 0 −119 −119 2,142 0 2,142 6,875 9,017 17,671 0 17,671 7,200 0 7,200 33,769 2000 0 −376 −376 1,341 0 1,341 7,814 9,155 14,043 79 14,122 6,542 0 6,542 29,442 2001 0 −484 −484 423 0 423 5,800 6,223 13,337 0 13,337 8,756 0 8,756 27,832 2002 1,468 −145 1,323 4,120 0 4,120 4,512 8,632 14,132 786 14,918 3,391 0 3,391 28,264 2003 3,364 −298 3,066 758 0 758 6,706 7,464 16,759 0 16,759 3,534 0 3,534 30,823 2004 2,995 −767 2,228 2,682 0 2,682 5,276 7,958 11,644 431 12,075 2,937 0 2,937 25,197 2005 3,115 −1,051 2,064 59 0 59 6,411 6,470 9,796 0 9,796 7,307 0 7,307 25,636 2006 3,607 2 3,609 105 0 105 8,020 8,125 9,906 0 9,906 6,997 0 6,997 28,637 2007 3,382 −41 3,342 898 696 1,594 7,211 8,806 22,763 0 22,763 5,245 303 5,548 40,459 2008 2,718 −213 2,505 2,936 1,452 4,388 5,251 9,639 17,304 51 17,356 5,534 813 6,347 35,846 2009 2,239 −218 2,021 2,995 685 3,680 5,500 9,180 18,160 68 18,228 7,179 990 8,170 37,598 2010 2,733 77 2,810 512 382 894 6,283 7,177 15,709 19 15,727 6,260 211 6,471 32,185 2011 3,598 164 3,762 817 254 1,071 7,629 8,700 10,747 0 10,747 6,826 271 7,096 30,305 2012 2,415 −5 2,410 929 1,031 1,960 6,169 8,129 14,210 0 14,210 5,389 313 5,702 30,451 2013 1,822 101 1,923 4,647 349 4,996 2,696 7,692 12,854 998 13,852 1,737 72 1,809 25,276 966
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-98
Table 2-10
Summary of Water Deliveries
Calendar
Year
PVCWD (AF)a United Water Conservation District (AF)
Total UWCD
and PVCWD
Water
Deliveries in
Oxnard
Subbasin (AF)
Conejo Creek
Flows Delivered
by CWD for
Agricultureb
Pumped
Groundwater
from Oxnard
Subbasin Basin
Total
PVCWD
Water
Delivered
PTP (Oxnard Subbasin Only) O-H Supply Line (Oxnard Subbasin Only) PVP (Oxnard Subbasin and Pleasant Valley Basin) c
PTP
Wells 1–5
(LAS)
Saticoy
Wells
(UAS)
Total PTP
Groundwater
Pumpage
Total PTP
Surface
Water
Total PTP
Water
Municipal
Deliveries
Agriculture
Deliveries
Total O-H
Water
Diversions of Santa
Clara River Water Used
in the Oxnard Subbasin
for Agriculture
Recharged Spreading
Water Pumped and
Used in the Oxnard
Subbasin for Agriculture
(Saticoy Wells)
d
Total PVP
Water
2014 1,151 −287 864 7,027 0 7,027 22 7,049 10,773 0 10,773 112 0 112 18,798 2015 1,319 −876 443 5,476 0 5,476 0 5,476 10,920 0 10,920 0 0 0 16,839 Maximum 3,607 708 3,762 9,506 1,452 9,506 8,020 9,762 22,763 998 22,763 16,064 990 8,996 40,459 Minimum 0 −1,051 −1,007 0 0 0 0 0 6,881 0 6,881 0 0 0 16,839 Average 1,159 −211 948 2,351 156 2,508 4,779 7,287 13,947 78 14,025 9,113 96 5,104 27,364 Notes: AF = acre-feet; CWD = Camrosa Water District; LAS = Lower Aquifer System; O-H = Oxnard–Hueneme; PTP = Pumping Trough Pipeline; PVCWD = Pleasant Valley County Water District; PVP = Pleasant Valley Pipeline; UAS = Upper Aquifer System; UWCD = United Water Conservation District. a Negative value indicates groundwater pumped in the Oxnard Subbasin and used in Pleasant Valley. b For water supplied by Camrosa Water District to PVCWD, 56% is used in the Oxnard Subbasin and 44% in the Pleasant Valley Basin; only the 56% used in the Oxnard Subbasin is shown in this table. c For water supplied via the UWCD PVP to PVCWD, 56% is used in the Oxnard Subbasin and 44% in the PVB; only the 56% used in the Oxnard Subbasin is shown in this table. d UWCD extracts limited amounts of temporarily stored water from shallow wells at its Saticoy Spreading Grounds to the PVP during periods of mounding, as authorized by FCGMA Resolution 2011-02. 967
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-99
Table 2-11
Recharge by Type (AF)
Calendar
Year
UWCD
Spreading Precipitation
Pumped
Groundwater
Applied Water
(M&I and
Domestic)

PTP/PVP
System Total Recharge
1985 33,837 4,937 18,562 753 1,254 59,343
1986 59,810 14,048 16,017 747 1,399 92,021
1987 32,825 7,149 17,878 744 1,353 59,949
1988 40,579 6,096 16,719 771 1,934 66,100
1989 16,920 2,130 17,158 869 2,542 39,620
1990 8,904 1,502 16,449 939 2,051 29,844
1991 39,289 11,869 14,044 745 2,510 68,455
1992 101,421 15,752 11,886 863 3,336 133,258
1993 94,241 15,461 11,778 784 4,230 126,494
1994 50,588 6,173 12,936 853 4,003 74,553
1995 98,952 19,121 10,501 874 4,075 133,525
1996 54,047 12,566 10,908 635 3,771 81,928
1997 52,261 10,592 13,396 725 3,995 80,970
1998 118,672 21,656 9,555 755 4,022 154,660
1999 35,816 4,927 11,928 846 4,114 57,631
2000 51,793 8,733 11,216 1,113 3,906 76,762
2001 75,176 15,715 10,105 1,079 3,748 105,823
2002 20,209 5,728 11,440 1,116 3,137 41,630
2003 34,111 8,670 9,949 1,003 3,343 57,076
2004 23,166 10,322 10,642 1,342 3,658 49,129
2005 118,629 14,794 8,733 1,292 4,053 147,501
2006 80,554 8,575 9,855 1,239 4,564 104,786
2007 29,703 2,704 11,588 779 4,072 48,846
2008 56,433 7,548 10,761 1,036 4,689 80,468
2009 22,438 6,057 10,135 932 4,690 44,252
2010 46,228 16,086 8,695 954 3,899 75,861
2011 71,959 6,759 9,425 1,079 4,544 93,767
2012 20,816 3,695 10,640 975 3,643 39,768
2013 2,686 735 11,663 1,044 2,698 18,825
2014 2,900 6,182 11,404 1,011 1,999 23,496
2015 2,516 1,064 11,278 857 1,671 17,386
Maximum 118,672 21,656 18,562 1,342 4,690 154,660
968
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-100
Table 2-11
Recharge by Type (AF)
Calendar
Year
UWCD
Spreading Precipitation
Pumped
Groundwater
Applied Water
(M&I and
Domestic)

PTP/PVP
System Total Recharge
Minimum 2,516 735 8,695 635 1,254 17,386
Average 48,306a 8,947 12,169 928 3,319 73,669
Notes: AF = acre-feet; M&I = municipal and industrial; PTP = Pumping Trough Pipeline; PVP = Pleasant Valley Pipeline; UWCD = United Water Conservation District.
a The difference between 48,306 AFY in this table and 48,279 AFY in Table 2-9 is caused by how UWCD tracks monthly spreading. The UWCD hydrologist entered a negative number in some of the monthly records to reconcile their percolation total. So for the following 3 months, Table 2-7 has:
 August 1988 recharge to Saticoy is −8 acre-feet.
 April 1990 recharge to Saticoy is −11.34 acre-feet.
 September 1997 recharge to Saticoy is −255.06 acre-feet. 969
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-101
Table 2-12
Stream Flows in Arroyo Las Posas and Conejo Creek, and Conejo Creek Diversion and Deliveries to the Pleasant Valley County Water District (AF) Calendar
Year
Arroyo Las Posas Flows
Measured at Stream Gauge 806
until 1997 and 806A to 2005
Conejo Creek Flows Measured
at Stream Gauge 800 until
2011 and 800A to 2012
Conejo Creek Water
Delivered by CWD
for Agriculture (AF)a
Conejo Creek Flows
Delivered by CWD for
Agriculture In PVCWDb
Conejo Creek
Flows Delivered
by CWD for M&I
Total CWD
Conejo Creek
Flows Diversions
1985 1,174 14,265 2,450 0 0 2,450
1986 11,707 25,621 2,450 0 0 2,450
1987 3,487 16,851 2,450 0 0 2,450
1988 3,256 16,922 2,450 0 0 2,450
1989 840 14,785 2,450 0 0 2,450
1990 1,068 12,608 2,450 0 0 2,450
1991 9,715 20,227 2,450 0 0 2,450
1992 26,792 44,305 2,450 0 0 2,450
1993 27,749 52,306 2,450 0 0 2,450
1994 2,956 16,195 2,450 0 0 2,450
1995 26,984 45,909 2,450 0 0 2,450
1996 9,919 22,862 2,450 0 0 2,450
1997 10,742 22,905 2,450 0 0 2,450
1998 47,361 49,704 2,450 0 0 2,450
1999 923 16,479 2,450 0 0 2,450
2000 4,884 18,000 2,450 0 0 2,450
2001 18,819 28,092 2,450 0 0 2,450
2002 3,003 16,744 2,450 2,621 0 5,071
2003 12,973 21,592 1,249 6,008 256 7,513
2004 13,757 23,522 1,345 5,348 276 6,969
2005 54,549 46,396 1,639 5,562 336 7,537
2006 NA 23,175 1,457 6,441 298 8,196
970
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-102
Table 2-12
Stream Flows in Arroyo Las Posas and Conejo Creek, and Conejo Creek Diversion and Deliveries to the Pleasant Valley County Water District (AF) Calendar
Year
Arroyo Las Posas Flows
Measured at Stream Gauge 806
until 1997 and 806A to 2005
Conejo Creek Flows Measured
at Stream Gauge 800 until
2011 and 800A to 2012
Conejo Creek Water
Delivered by CWD
for Agriculture (AF)a
Conejo Creek Flows
Delivered by CWD for
Agriculture In PVCWDb
Conejo Creek
Flows Delivered
by CWD for M&I
Total CWD
Conejo Creek
Flows Diversions
2007 NA 17,048 3,288 6,040 674 10,002
2008 NA 25,254 2,895 4,854 358 8,107
2009 NA 19,099 3,225 3,998 673 7,896
2010 NA 20,293 2,554 4,880 594 8,028
2011 NA 17,518 2,359 6,425 533 9,317
2012 NA 7,612 2,603 4,312 653 7,568
2013 NA NA 2,999 3,253 754 7,006
2014 NA NA 2,858 2,055 854 5,767
2015 NA NA 2,555 2,355 794 5,704
Maximum 54,549 52,306 3,288 6,441 854 10,002
Minimum 840 7,612 1,249 0 0 2,450
Average 13,936 24,153 2,423 2,069 227 4,720
Notes: AF = acre-feet; CWD = Camrosa Water District; M&I = municipal and industrial; NA = not applicable; PVCWD = Pleasant Valley County Water District. a 2,450 AFY between 1985 and 2002 accounts for riparian water rights holders' use of Conejo Creek water prior to development of CWD's Diversion Facility and non-potable surface water system.

Between 2003 and 2006, deliveries are less than previous assumptions as not all riparian customers had connected to the CWD non-potable system. It is fair to assume the difference between those volumes and 2,450 were still applied to land.
b For water supplied by CWD to PVCWD, 56% is used in the Oxnard Subbasin and 44% in the PVB. 971
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-103
Table 2-13
Sales and Usage of Imported Water Supplied by the Calleguas Municipal Water District (AF) Calendar Year
Delivered and Used by the City
of Oxnard for M&I
Delivered and Used by Port
Hueneme Water Agency for M&I
Total Imported
Water Supplied
1985 14,094 0 14,094
1986 14,023 0 14,023
1987 14,422 0 14,422
1988 14,565 0 14,565
1989 15,026 0 15,026
1990 16,853 0 16,853
1991 12,705 0 12,705
1992 15,576 0 15,576
1993 14,799 0 14,799
1994 11,441 0 11,441
1995 14,513 0 14,513
1996 12,392 64 12,456
1997 13,615 641 14,256
1998 12,675 2,234 14,909
1999 14,721 2,615 17,336
2000 14,487 2,935 17,422
2001 13,201 1,731 14,932
2002 13,591 3,054 16,645
2003 12,858 1,072 13,930
2004 13,742 1,595 15,337
2005 12,447 1,590 14,037
2006 11,994 2,067 14,061
2007 14,008 2,221 16,229
2008 15,150 1,197 16,347
2009 10,431 1,278 11,709
2010 11,238 838 12,076
2011 11,506 1,072 12,578
2012 13,474 1,047 14,521
2013 15,331 2,011 17,342
2014 13,550 1,483 15,033
2015 11,116 556 11,672
Maximuma 16,853 3,054 17,422
Minimuma 10,431 64 11,441
Averagea 13,534 1,565 14,543
Notes: AF = acre-feet; M&I = municipal and industrial.
a Maximum, minimum, and average values are calculated for the period over which water deliveries occurred. 972
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-104

INTENTIONALLY LEFT BLANK
973
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-105
Table 2-14
Oxnard Subbasin Groundwater Used
Calendar
Year
Agricultural Pumpage (AF) M&I Pumpage (AF) Domestic Pumpage (AF) Totals (AF) Pumpage
(UAS)
Pumpage
(LAS)
Pumpage
(Semi-Perched)
Total
Agricultural
Pumpage
(UAS)
Pumpage
(LAS)
Pumpage
(Semi-Perched) Total M&I
Pumpage
(UAS)
Pumpage
(LAS)
Pumpage
(Semi-Perched)
Total
Domestic
Pumpage
(UAS) Pumpage (LAS)
Pumpage
(Semi-Perched) Total Pumpage
1985 42,652 27,990 26 70,669 23,578 5,996 15 29,589 4,926 593 3 5,522 71,157 34,579 44 105,780 1986 36,285 23,167 37 59,489 24,196 5,038 24 29,258 3,752 270 4 4,026 64,234 28,475 65 92,773 1987 39,028 33,285 38 72,350 25,198 5,004 24 30,226 3,122 182 3 3,307 67,347 38,471 65 105,883 1988 34,505 31,938 33 66,476 26,475 4,574 25 31,074 2,683 511 3 3,196 63,663 37,023 61 100,746 1989 34,238 35,435 41 69,713 24,548 8,521 29 33,098 2,657 798 3 3,458 61,443 44,754 73 106,269 1990 34,082 42,137 83 76,302 23,000 9,780 56 32,837 738 8 2 748 57,820 51,926 141 109,887 1991 25,830 30,008 67 55,905 19,682 7,068 51 26,801 4,134 7 11 4,152 49,646 37,084 128 86,858 1992 24,076 20,070 48 44,194 21,286 3,562 43 24,892 491 9 1 501 45,853 23,641 92 69,587 1993 23,621 19,757 35 43,413 23,294 5,626 34 28,954 589 8 1 598 47,504 25,392 70 72,966 1994 26,820 23,981 48 50,849 22,505 8,818 40 31,363 544 7 1 552 49,868 32,806 89 82,764 1995 21,580 17,759 30 39,369 17,335 6,818 24 24,177 605 7 1 613 39,520 24,584 55 64,159 1996 21,642 22,211 17 43,870 12,866 5,221 10 18,096 560 8 0 568 35,068 27,440 27 62,535 1997 25,190 25,725 10 50,925 26,612 6,515 10 33,138 320 8 0 327 52,122 32,248 20 84,390 1998 20,263 15,279 3 35,545 22,611 6,597 3 29,211 204 7 0 211 43,078 21,883 6 64,966 1999 23,082 23,765 5 46,852 24,871 3,073 5 27,949 316 5 0 322 48,269 26,844 10 75,123 2000 21,982 21,027 5 43,014 23,380 6,788 6 30,174 199 4 0 203 45,561 27,819 11 73,390 2001 19,046 17,194 4 36,244 23,292 6,460 5 29,757 212 6 0 219 42,551 23,661 8 66,220 2002 20,837 24,502 0 45,338 23,555 8,819 0 32,374 179 3 0 182 44,571 33,324 0 77,895 2003 17,772 17,645 0 35,417 29,374 6,368 0 35,742 182 4 0 186 47,327 24,017 0 71,345 2004 19,299 21,732 0 41,031 27,091 8,775 0 35,866 280 6 0 286 46,670 30,513 0 77,183 2005 16,464 15,140 0 31,604 24,213 10,080 0 34,292 357 5 0 362 41,034 25,225 0 66,258 2006 18,290 16,268 0 34,558 24,405 12,044 0 36,449 163 4 0 168 42,858 28,316 0 71,174 2007 24,110 20,802 0 44,912 30,289 7,047 0 37,336 165 5 0 170 54,564 27,854 0 82,418 2008 23,618 22,853 0 46,471 27,999 8,034 0 36,033 159 5 0 163 51,775 30,891 0 82,667 2009 20,027 22,784 0 42,811 31,272 7,670 0 38,942 132 5 0 137 51,431 30,458 0 81,890 2010 17,056 16,767 0 33,822 26,963 6,890 0 33,853 126 23 0 150 44,145 23,680 0 67,825 2011 18,648 18,253 0 36,901 22,832 8,725 0 31,558 128 6 0 134 41,608 26,984 0 68,592 2012 20,914 22,376 0 43,290 22,415 8,790 0 31,205 131 3 0 134 43,460 31,169 0 74,629 2013 22,514 29,341 0 51,855 22,202 9,816 0 32,018 184 2 0 186 44,900 39,159 0 84,059 2014 22,536 32,236 0 54,772 20,224 7,667 0 27,891 252 2 0 254 43,012 39,905 0 82,917 2015 23,102 32,870 1 55,973 18,884 5,762 1 24,648 191 3 0 193 42,177 38,635 2 80,814 Maximum 42,652 42,137 83 76,302 31,272 12,044 56 38,942 4,926 798 11 5,522 71,157 51,926 141 109,887 Minimum 16,464 15,140 0 31,604 12,866 3,073 0 18,096 126 2 0 134 35,068 21,883 0 62,535 Average 24,487 24,010 17 48,514 23,756 7,160 13 30,929 925 81 1 1,007 49,169 31,250 31 80,450 Notes: AF = acre-feet; LAS = Lower Aquifer System; M&I = municipal and industrial; UAS = Upper Aquifer System.

Pumping amounts are from the UWCD model and usage type is from the FCGMA well database. 974
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-106

INTENTIONALLY LEFT BLANK
975
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-107
Table 2-15
Modeled 2040–2069 Groundwater Extraction Rates and Surface Water Deliveries for the Oxnard Subbasin
Model Scenario
Upper Aquifer System
Groundwater Extractions
(AFY)
Lower Aquifer System
Groundwater Extractions
(AFY)
Total Groundwater
Extractions
(AFY)
Future Baseline 39,000 29,000 68,000
Future Baseline With
Projects
41,000 25,000 66,000
Reduction With Projects 27,000 13,000 40,000
Reduction Without Projects
Scenario 1
27,000 12,000 39,000
Reduction Without Projects
Scenario 2
18,000 12,000 30,000
Reduction Without Projects
Scenario 3
18,000 12,000 30,000
Notes: AFY = acre-feet per year.
976
2 – BASIN SETTING
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INTENTIONALLY LEFT BLANK
977
Pacific Ocean
232 ?
126 ?
118 ?
?34
?1
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Santa Monica Mountains
Pleasant Valley Rd
Oxnard
Blvd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Oxnard
Blvd
Ventura Rd
5th St 5th
St
Ventura Rd
Oxnard
Ave
Oxnard
Blvd
Lewis Rd
Oxnard
Forebay
Area
Oxnard Plain
Pressure Area
Price Rd
Aggen Rd
Camarillo Hills
Date: 4/4/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Figure 2-1.mxd n 012345
Miles
£¤101
?118
?34
?1
126 ?
?23
232 ?
SOURCE: CGS 2002; DWR 2016; Cal-Atlas 2016; FCGMA 2016
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-1
Oxnard Subbasin Vicinity Map
Legend
Revised Bulletin 118 Groundwater Basins and Subbasin (DWR 2016) Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Historical FCGMA Forebay Area
Fox Canyon Groundwater Management Agency Boundary (FCGMA 2016) Transverse Ranges Geomorphic Province
978
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-110

INTENTIONALLY LEFT BLANK
979
M
F
M
F
M
F
F
M
F
M
F
M
F
M
F
A
A'
B
B'
Camarillo Fault
Wright Road Fault
Spanish Hills Fault
Berylwood
La Loma Fault
Oak Ridge Fault
Springville Fault Zone
Fox Canyon Fau
Somis Fault (
Montalvo Anticline
Springville Anticline
Long Canyon Anticline
Camarillo Hills Anticline
Long Canyon Syncline
Las Posas Syncline
Bailey Fault
McGrath Fault
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Calleguas Creek
Revolon Slough
Santa Clara River
232 ?
126 ?
118 ?
?34
?1
£¤101
Santa Monica Mountains

PLEASANT VALLEY BASIN

LAS POSAS BASIN

OXNARD SUBBASIN

FOREBAY AREA

PLAIN PRESSURE AREA
Pleasant Valley Rd
Oxnard
Blvd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Oxnard Blvd
Ventura Rd
5th St 5th
St
Ventura Rd
Oxnard
Ave
Lewis Rd Aggen Rd
Camarillo Hills
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; FCGMA; surficial geology after California Geological Survey; folds after Dibblee 1992a and 1992b, Devecchio 2012a, Turner 1975; faults after DeVecchio et al. 2012a
Date: 3/27/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Figure 2-2.mxd FIGURE 2-2
Geology of the Oxnard Subbbasin
Fox Canyon Groundwater
Management Agency Boundary
(FCGMA 2016)
Oxnard (4-004.02)
Historical FCGMA Forebay Area
Major Rivers/Stream Channels
Faults (Dashed Where Inferred)
F Anticline
M Syncline
Geologic Units
Recent Alluvium: Wash
Recent Alluvium
Older Alluvium
Saugus Formation
Las Posas Sand: Sand Pedro and
Santa Barbara Formations
Pico Formation
Conejo Volcanics
n 05 2.5
Miles
Ventura Fault Country Club Fault
980
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-112

INTENTIONALLY LEFT BLANK
981
DRAFT Cross Section A-A’
FIGURE 2-3
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: Turner 1975; Based on Plates 9A and 9B (Cross Section C-C’).

Shallow (”Semi-perched”) aquifer Upper Aquifer System (Oxnard and Mugu Aquifer Zones) Lower Aquifer System (Upper San Pedro / Hueneme Aquifer Zone) Lower Aquifer System: Fox Canyon Aquifer Zone
0 -200
-400
-600
-800
-1000
-1200
-1400
-1600
-1800
-2000
200
400
Clay Marker Bed / Low Permeability Sediments
0 20,000 40,000 60,000
0 -200
-400
-600
-800
-1000
-1200
-1400
-1600
-1800
-2000
200
400
A A’
West East
Oxnard Pressure Plain Area Forebay Area
South
Mountain
Central Ave.

State Hwy. 1
Pacific Ocean
Hwy. 118
Hwy. 101 E. Fifth Street Hueneme Road
10,000 30,000 50,000

ELEVATION IN FEET

ELEVATION IN FEET
982
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-114

INTENTIONALLY LEFT BLANK
983
Cross Section B-B’
FIGURE 2-4 SOURCE: Turner 1975; Based on Plates 7A and 7B (Cross Section A-A’).

Groundwater Sustainability Plan for the Oxnard Subbasin Clay Marker Bed / Low Permeability Sediments Lower Aquifer System: Hueneme Aquifer Shallow (“Semi-Perched”) Aquifer Lower Aquifer System: Fox Canyon Lower Aquifer System: Grimes Canyon Aquifer
Upper Aquifer System: Oxnard and Mugu Aquifers
B B’
North South McGrath Fault Bailey Fault
0 -500
-1000
-2000
500
-1500
0 20,000 40,000 60,000 80,000
0 -500
-1000
-2000
500
-1500
Oxnard Subbasin
Mound
Subbasin
Oxnard Pressure Plain Area
Santa Clara River Channel Islands Blvd. Hueneme Road State Hwy 1 Las Posas Syncline 10,000 30,000 50,000 70,000

ELEVATION IN FEET

ELEVATION IN FEET
984
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-116

INTENTIONALLY LEFT BLANK
985
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SYCAMORE CANYON FAULT
Simi-Santa Rosa Fault
Camarillo Fault
Spanish Hills Fault
Wright Road Fault

BONEY MOUNTAIN FAULT
Somis Fault
Springville Fault Zone
Bailey Fault
Little Simi Valley Fault
Somis Fault
Oak Ridge Fault
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Conejo
Arroyo Las Posas
Calleguas Creek
Arroyo Simi
Conejo Creek
ArroyoS ant a Rosa
Revolon Slough
Santa Clara River
?23
232 ?
126 ?
?34
?1
118 ?
£¤101
T02N
T01S
T01N
R23W R22W R21W R20W
R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountc l ef
Ridg e
Cama r illo Hills
Las Posa s Hills
Santa Monica Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/25/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Figure 2-X. Oxnard Pumping Mapped2.mxd 02 1 n Miles
FIGURE 2-5
Upper Aquifer System 2015 Extraction (acre-feet) in Oxnard and Pleasant Valley Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range
(East-West)
Faults (Dashed Where Inferred)
Revised Bulletin 118 Groundwater Basins and
Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
2015 Extraction (acre-feet)
!( 0 - 2; 44 AF total
!( >2 - 10; 149 AF
!( >10 - 100; 3,867 AF
!( >100 - 1000; 27,400 AF
!( >1000; 11,766 AF
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Well screened in multiple aquifers in the
UAS
< Well screened in both the UAS and LAS
F Well screened in undetermined aquifer(s)
Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Legend
986
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-118

INTENTIONALLY LEFT BLANK
987
!H
!H
!H
!H
!H
!H
!H
!H
!H
!(
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!H!H
#
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SYCAMORE CANYON FAULT
Simi-Santa Rosa Fault
Camarillo Fault
Spanish Hills Fault
Wright Road Fault

BONEY MOUNTAIN FAULT
Somis Fault
Springville Fault Zone
Bailey Fault
Little Simi Valley Fault
Somis Fault
Oak Ridge Fault
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Conejo
Arroyo Las Posas
Calleguas Creek
Arroyo Simi
Conejo Creek
ArroyoS ant a Rosa
Revolon Slough
Santa Clara River
?23
232 ?
126 ?
?34
?1
118 ?
£¤101
T02N
T01S
T01N
R23W R22W R21W R20W
R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountc l ef
Ridg e
Cama r illo Hills
Las Posa s Hills
Santa Monica Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/25/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Figure 2-X. Oxnard Pumping Mapped2.mxd 02 1 n Miles
FIGURE 2-6
Lower Aquifer System 2015 Extraction (acre-feet) in Oxnard and Pleasant Valley Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range
(East-West)
Faults (Dashed Where Inferred)
Revised Bulletin 118 Groundwater Basins and
Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF total
!( >2 - 10; 85.5 AF total
!( >10 - 100; 1,706 AF total
!( >100 - 1000; 38,516 AF total
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the
LAS
< Wells screened in both the UAS and LAS
F Well screened in undetermined aquifer(s)
Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Legend
988
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-120

INTENTIONALLY LEFT BLANK
989
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) )
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0 -10
0 0
-20
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Cone jo
Santa Clara River
19K10
NM
03F07
NM
11B01
NM
14K01
NM
08L05
NM
11J02
NM
12A01
NM
12F03
NM 12Q06
NM
12R01
NM
12R04
NM
13C01
NM
13N07
NM
14D01
NM 14G08
NM
23B09
NM
30A05
NM
30C04
NM
30K04
NM 36E05
NM
36C04
NM
06L04
-15.3
06R01
-13.9
07H01
-12.94
17D02
-18.79
19C01
-27.21
19L12
-17.93 19L13
-13.63
31A08
-14.48
31A09
-17.27 32Q06
-12.73
03F08
-17.26
03F12
-16.26
03F13
-14.4
14R02
-16.5
20J08
-7.59
20M05
-5.78 26J04
-14.34
27C03
-9.03
27R04
-8.99 27R05
-1.2
28G04
-8.07
28G05
-7.43
35E05
-10.06 36K09
-13.07
01C05

1.18 08L04
-7.34
01H04
-13.76
18H03
-4.68
19B02
-3.36
34G05

10.12 12A02

46.25 12G03

33.61 12J02

23.74 13N06
-13.8
14A09
-7.76
14G06
-14.41
15L01
-11.94
15P01
-14.7
15R02
-19.3
16R02
-14 23B08
-13.06
23H06
-13.7
30K01
-18.28
36E06
-16.08 T02N
T01N
T01S
R20W
R23W
R22W R21W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Balcom Canyon Rd
Rd
BradleyRd
Price
Aggen Rd
Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount cl e f
Ridg e
Camar illo Hills
Las Posa s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 4/19/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-7
Groundwater Elevation Contours in the Oxnard Aquifer, March 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
) Well screened in the Oxnard aquifer
990
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-122

INTENTIONALLY LEFT BLANK
991
?
?
?
?
)
)
)
)
)
) )
)
)
)
)))))
)
)
)
)
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)
)
)
))
)
)
)
)
) ))
)
)
) ) )
) )
) ) )
)))
) )
))
))
)
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Santa Clara River
Arro yo Cone jo
17D02
NM
19K10
NM
11B01
NM
08L05
NM
11J02
11Q01 NM
NM
12A01
NM
12F03
NM
12G03
NM
12Q06
NM
13N07
NM
14D01
NM
15P01
NM
30C04
NM
36C04
NM
14K01
(-52.83)
23B09
(10.41)
06L04
-25
06R01
-24.54
07H01
-22.58
19C01
-23.61
19L12
-28.96 19L13
-20.33
31A08
-28.22
31A09
-23.14 32Q06
-20.24
03F07
-22.06
03F08
-23.86
03F13
-24.58
14R02
-21.59
20J08
-14.19
20M05
-11.27 26J04
-23.31
27C03
-14.83
27R04
-14.59 27R05
-3.43
28G04
-13.6
28G05
-12.42
35E05
-17.06 36K09
-24.14
01C05
-0.92
08L04
-11.05
01H04
-20.37
18H03
-8.19
19B02
-10.4
34G05
-10.19
12A02

37.88 12J02

12.11 13N06
-26.39
14A09
14F03 -19.01
-30.22
14G06
-27.85
14G07
-26.71 15L01
-18.96
15R02
-30.7
16R02
-21.44
23B08
-28.19
23H06
-26.72
30A05
-26.35
30K01
-26.93
30K04
-29.2 36E05
-20.81
36E06
-25.03
T02N
T01N
T01S
R20W
R23W
R22W R21W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Balcom Canyon Rd
Rd
BradleyRd
Price
Aggen Rd
Rd
30 20
-20
-10
10 0
-10
-30
-20
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount cl e f
Ridg e
Camar illo Hills
Las Posa s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 4/19/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-8
Groundwater Elevation Contours in the Oxnard Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
) Well screened in the Oxnard aquifer
992
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-124

INTENTIONALLY LEFT BLANK
993
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-9A
Groundwater Well Hydrographs in the Oxnard Aquifer - Oxnard Plain -40-30-20-1001020304050
-60-40-20
0 204060
1920 1929 1940 1949 1960 1970 1980 1990 2000 2010 2020
Cumulative Departure from the Mean (inches rainfall)
Groundwater Elevation (ft amsl)
02N22W30A05S 01N22W03F07S 01N22W27R04S 01N22W27R05S
01S22W01H04S 01S21W08L04S 01S21W08L05S 01N21W32Q06S
01N21W19L12S 01N21W17D02S 01N21W07H01S Cumulative Departure 994
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-126

INTENTIONALLY LEFT BLANK
995
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-9B
Groundwater Well Hydrographs in the Oxnard Aquifer - Forebay Area -40-30-20-1001020304050
-60-40-20
0 20406080
100120140160
1920 1929 1940 1949 1960 1970 1980 1990 2000 2010 2020
Cumulative Departure from the Mean (inches rainfall)
Groundwater Elevation (ft amsl)
02N22W12A02S 02N22W14A09S 01S22W01H04S 02N21W18H03S Cumulative Departure 996
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-128

INTENTIONALLY LEFT BLANK
997
?
?
?
?
?
?
?
W
W
W
W
W
W
W
W
W W
W
W
W
W
W W
W
W
W
W
W
W
WW
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon S lough
C onejo Creek
C all eguas Cree k
Arro yo Con e jo
Santa Clara Riv er
03K01
NM
12C06
NM
36E07
NM
20C05
(-2.62)
32Q07
(-41.21)
19L11
-28.85 21N01
-58.56
31A07
-55.33
32Q05
-60.73
02A02
-14.24
20J07
-9.09
20M04
-6.26
26J03
-33.13
27C02
-14.32
27R03
-27.51
29D04
-4.52
35E04
-28.88 36K08
-27.89
01H03
-29.37
07L06

8.2 13N05
-17.34
14G04
-19.84
14G05
-18.48
23B07
-20.72
24P01
-19.34
36E04
-14.92
T02N
T01N
T01S
R20W
R23W
R22W R21W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Balcom Ca
Rd
nyon Rd
Brad el yRd
Price Rd
Aggen Rd
0 -10
-20
-30
-40
-50
-60
-10
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Cama r illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 5/8/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-10
Groundwater Elevation Contours in the Mugu Aquifer, March 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
W Well screened in the Mugu aquifer
998
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-130

INTENTIONALLY LEFT BLANK
999
?
?
?
?
?
?
?
?
? ?
?
W
W
W
W
W
W
W
W
W W
W
W
W
W
W W
W
W
W
W
W
W
WW
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon S lough
C onejo Creek
C all eguas Cree k
Arro yo Con e jo
Santa Clara Riv er
-20
-30
-20
-60
-70
-40
-50
-90
-80
03K01
NM
12C06
NM
36E04
NM
36E07
NM
20C05
(-7.29)
32Q07
(-65.02)
19L11
-40.87 21N01
-95.26
31A07
-88.7
32Q05
-97.74
02A02
-22.28
20J07
-14.96
20M04
-11.55
26J03
-44.39
27C02
-22.57
27R03
-43.88
29D04
-10.43
35E04
-42.73 36K08
-45.17
01H03
-45.89
07L06
-12.07
13N05
-28.35
14G04
-29.99
14G05
-29.3
23B07
-30.81
24P01
-33.53
T02N
T01N
T01S
R20W
R23W
R22W R21W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Balco
Rd
m Ca
nyon Rd
Brad el yRd
Price Rd
Aggen Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Cama r illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 5/8/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-11
Groundwater Elevation Contours in the Mugu Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
W Well screened in the Mugu aquifer
1000
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-132

INTENTIONALLY LEFT BLANK
1001
Groundwater Sustainability Plan for the Oxnard Subbasin Groundwater Well Hydrographs in the Mugu Aquifer
FIGURE 2-12
-60-40-2002040
-120-100
-80-60-40-20
0 20406080
100
1960 1970 1980 1990 2000 2010 2020
Cumulative Departure (inches rainfall)
Groundwater Elevation (ft amsl)
02N22W14G05S 02N22W14G04S 02N22W24P01S 02N22W36E07S01N21W19L11S 01N21W32Q05S 01S22W01H03S 01N21W32Q07S01N22W27R03S Cumulative Departure 1002
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-134

INTENTIONALLY LEFT BLANK
1003
?
?
?
?
?
?
?
?
?
*
*
*
*
*
*
* *
* *
*
**
*
*
*
*
*
*
***
0 -20
-20
-40
-60
-80
-40
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Con e jo
Santa Clara Riv er
03R01
NM
19A01
NM
26M03
NM
18H13
NM
19J03
NM
22Q05
NM
36E02
NM
36E03
NM
20M03
(-14.6)
29D03
(-11.26)
23B05
(-65.53)
23B06
(-23.2)
03F05
-15.94
16D04
-26.35
20J05
-19.91
20M02
-17.57 28G03
29D02 -22.29
-25.13
01C03
-23.24 01C04
-20.03
31P03
-85.75
31P06
-89.36
34G04
-59.25
12N03

10.16 23B04
-75.59
26B03
-38.03
36E08
-31.7 T02N
T01N
T01S
R20W
R23W
R22W R21W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Balcom Ca
Rd
nyon Rd
Brad el yRd
Price Rd
Aggen Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Cama r illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 5/8/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-13
Groundwater Elevation Contours in the Hueneme Aquifer, March 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
* Well screened in the Hueneme aquifer
1004
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-136

INTENTIONALLY LEFT BLANK
1005
?
? ?
? ?
?
?
?
*
*
*
*
*
*
* *
* *
*
**
*
*
*
*
*
*
***
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Con e jo
Santa Clara Riv er
0 -20
-40
-60
-40
-60
-20
-80
-100
03R01
NM
19A01
NM
26M03
NM
18H13
NM
19J03
NM
22Q05
NM
36E03
NM
29D02
(-31.98)
23B05
(-75.84)
23B06
(-36.43)
36E02
(-30.56)
03F05
-38.04
16D04
-33.56
20J05
-27.68
20M02
-24.8
20M03
-21.3
28G03
29D03 -29.79
-17.97
01C03
-29.95 01C04
-26.52
31P03
-115.51
31P06
-100.67
34G04
-80.28
12N03

2.06 23B04
-86.77
26B03
-86.17
36E08
-42.95 T02N
T01N
T01S
R20W
R23W
R22W R21W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Balco
Rd
m Ca
nyon Rd
Brad el yRd
Price Rd
Aggen Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Cama r illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 5/8/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-14
Groundwater Elevation Contours in the Hueneme Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
* Well screened in the Hueneme aquifer
1006
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-138

INTENTIONALLY LEFT BLANK
1007
Groundwater Sustainability Plan for the Oxnard Subbasin Groundwater Well Hydrographs in the Hueneme Aquifer
FIGURE 2-15
-80-60-40-200204060
-160-140-120-100
-80-60-40-20
0 204060
Cumulative Departure from the Mean (inches rainfall)
Groundwater Elevation (ft amsl)
02N21W31P03S 01N22W03F05S 01N22W16D04S01N22W26M03S Cumulative Departure 1960 1970 1980 1990 2000 2010 2020
1008
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-140

INTENTIONALLY LEFT BLANK
1009
? ? ?
?
?
?
?
?
?
?
?
?
(
(
(
(
(
(
(
(
(
( ( (
(
( (
(
(
(
(
(
(
(
( (
(
((
(
(
(
(
(
( (
(
(
(
(
(
(
( ((
(
((
(
(
(
(
(
(( (
(
(
(
(
(
(
(
((
(((( (
(
(
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Sim i
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Cone jo
Santa ClaraRiv er
26K04
NM
07K02
NM
01E02
NM
03B01
NM
04B01
NM
09F01
NM
09Q07
NM
09R01
NM
11A03
NM
12H01
NM
18H10
NM
18H14
NM 20A01
NM
29L04
NM
34K01
NM
08H02
(471.07)
01A01
(150.38) 02D02
(151.64)
03H01
(165.45)
03J01
(150.56)
10D02
(165.53)
10J01
(285.77)
01L01
(158.5)
09D02
(-0.04)
11A02
(156.1)
16J01
(244.4)
34G02
(-70.07)
35J01
(146.52)
35R03
(155.57)
35P02
(65.61) 36Q01
(83.4)
03C01
-83.63
06J05
-107.33
09C04
-92.64
19L10
-62.55
31A05
-65.91 31A06
-66.8
32K01
-68.19
32Q04
-66.3
20J04
-28.12
20M01
-25.65 26K03
-65.63
28G02
29D01 -34.2
-18.6
35E02
-39.85 35E03
-39.4
36K06
-52.71 36K07
-52.06
01C02
-29.31
01H02
-39.02
06R01
-124.21
07R02
-138.7
08B01
-106.2
19M05

38.62 29B02
-19.7
07L03

1.84 07L04

3.88 08L02
-8.06
08L03
-15
11J03
-51 13A01
-105.29
16N03
-83.2
17F05
-29.6
32E01
-97.83
33R02
-107.4
34C01
-120.3
34G03
-92.53
23B03
-77
T02N
T01N
T01S
R20W
R23W
R22W R21W
-20
-40
-60
-80
-40
-60
20 0
-20
-100
-40
-100
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon Rd
Balcom Canyon Rd
BradleyRd
Aggen Rd
Price Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount cl e f
Ridg e
Camar illo Hills
Las Posa s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 4/21/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-16
Groundwater Elevation Contours in the Fox Canyon Aquifer, March 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
( Well screened in the Fox Canyon aquifer
1010
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-142

INTENTIONALLY LEFT BLANK
1011
?
? ?
? ?
?
?
?
?
?
?
(
(
(
(
(
(
(
(
(
( ( (
(
( (
(
(
(
(
(
(
(
( (
(
((
(
(
(
(
(
( (
(
(
(
(
(
(
( ((
(
((
(
(
(
(
(
(( (
(
(
(
(
(
(
(
((
(((( (
(
(
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Sim i
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Cone jo
Santa ClaraRiv er
26K03
NM
26K04
NM
03B01
NM
04B01
NM
09F01
NM
09Q07
NM
09R01
NM
01L01
NM
11A02
NM
11A03
NM 12H01
NM
16N03
NM
17F05
NM
18H10
NM
18H14
NM
29L04
NM
34C01
NM
34K01
NM
36Q01
NM
09D02
(-0.05)
16J01
(242.69)
34G02
(-117.53)
35P02
(46.2)
03C01
-117.52
06J05
-156.33
09C04
-131.71
19L10
-99.19
31A05
-109.42 31A06
-110.79
32K01
-112.4
32Q04
-105.38
20J04
-37.12
20M01
-34.47 28G02
29D01 -44.23
-26.05
35E02
-58.32 35E03
-66.43
36K06
-109.32 36K07
-106.82
01C02
-34.34
01H02
-63.08
07K02
368.45 08H02
470.76
01A01
137.86
01E03
132.49
02D02
145.86
03H01
151.68
03J01
128.81
06R01
-154
07R02
-139.8
08B01
-143.1
10D02
150.52
10G01
244.77
10J01
279.26
19M05

15.16 29B02
-30.5
07L03
-24.59 07L04
-32.02
08L02
-51
08L03
-51
11J03
-69.01
13A01
-114.6
20A01
-60.95
32E01
-110.44
33R02
-125.12
34G03
-120.62
23B03
-83.55
35J01
138.82
35R01
128.2
T02N
T01N
T01S
R20W
R23W
R22W R21W
-20
-80
-100
-140
-40
-60
-60
-80
-100
-120
0 -100
-40
-80
-120
-140
-40
-80
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Rd
Balcom Canyon Rd
BradleyRd
Aggen Rd
Price Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount cl e f
Ridg e
Camar illo Hills
Las Posa s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 4/21/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-17
Groundwater Elevation Contours in the Fox Canyon Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
( Well screened in the Fox Canyon aquifer
1012
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-144

INTENTIONALLY LEFT BLANK
1013
Groundwater Sustainability Plan for the Oxnard Subbasin Groundwater Well Hydrographs in the Fox Canyon Aquifer
FIGURE 2-18
-40-30-20-1001020304050
-180-160-140-120-100
-80-60-40-20
0 20406080
100120140160
1960 1970 1980 1990 2000 2010 2020
Cumulative Departure from the Meam (inches rainfall)
Groundwater Elevation (ft amsl)
01N23W01C02S 02N22W23B03S 02N21W08L03S 02N21W07L04S
01N21W06J05S 01N22W26K04S 01N21W32Q04S 02N21W29L04S01N21W09C04S 01S22W01H02S Cumulative Departure 1014
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-146

INTENTIONALLY LEFT BLANK
1015
+
+
+ +
+
+
+
+
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Cone jo
Santa ClaraRiv er
-70
-40
-60
-50
22A01
NM
32Q02
(-64.7)
T02N
T01N
T01S
32Q03
-75.56
28G01
-31.3
35E01
-35.95 36K05
-56.26
08L03
-57.87
22G01
-83.15
28A02
-78.31
R20W
R23W
R22W R21W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Balcom Canyon Rd
Rd
BradleyRd
Price
Aggen Rd
Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount cl e f
Ridg e
Camar illo Hills
Las Posa s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 4/21/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-19
Groundwater Elevation Contours in the Grimes Canyon Aquifer, March 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
+ Well screened in the Grimes Canyon aquifer
1016
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-148

INTENTIONALLY LEFT BLANK
1017
+
+
+ +
+
+
+
+
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Cone jo
Santa ClaraRiv er
-40
-60
-100
-80
22A01
NM
32Q02
-103.2
32Q03
-114.17
28G01
-38.58
35E01
-48.31 36K05
-111.34
08L03
-92.53
22G01
-90.09
28A02
-90.35
T02N
T01N
T01S
R20W
R23W
R22W R21W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Balcom Canyon Rd
Rd
BradleyRd
Price
Aggen Rd
Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount cl e f
Ridg e
Camar illo Hills
Las Posa s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 4/21/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-20
Groundwater Elevation Contours in the Grimes Canyon Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
+ Well screened in the Grimes Canyon aquifer
1018
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-150

INTENTIONALLY LEFT BLANK
1019
Groundwater Sustainability Plan for the Oxnard Subbasin Groundwater Well Hydrographs in the Grimes Canyon Aquifer FIGURE 2-21
-40-30-20-1001020304050
-180-160-140-120-100
-80-60-40-20
0 20406080
100120140160
1960 1970 1980 1990 2000 2010 2020
Cumulative Departure (inches rainfall)
Groundwater Elevation (ft amsl)
01N22W28G01S 01N22W35E01S 01N22W36K05S 01N21W32Q02S
01N21W32Q03S 01S21W08L03S Cumulative Departure
1020
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-152

INTENTIONALLY LEFT BLANK
1021
Groundwater Sustainability Plan for the Oxnard Subbasin Oxnard Subbasin Annual Change in Storage
FIGURE 2-22
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
Pumping and Spreading by Calendar Year (Acre-feet)
Annual Change in Storage by Water Year (Acre-feet)
Water Year
Pumping
Below Normal
Wet Above Normal
Dry
Water Year Type
2) Water year is October 1 to September 30 (e.g., water year 2012 is from October 1, 2011, to September 30, 2012)3) Water year type is based on the perce tage of the water year precipitation compared to the 30 year precipitationNormal (≥75% to <100% of average), Dry (≥50% to <75% of average), and Critical (<50% of verage). 1) Estimated Annual Change in Storage is from the United Water Conservation District (UWCD) numerical groundwater model report from July 2018. Estimated Change in Storage is the sum of the Change in Storage from all aquifers in the basin included in the UWCD numerical groundwater model.

Notes:
020000
40000
60000
80000
100000
120000
140000
-60000-40000-20000
0 20000
40000
60000
80000
100000
TotalLASUASSemi-perchedSpreading
1022
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-154

INTENTIONALLY LEFT BLANK
1023
Groundwater Sustainability Plan for the Oxnard Subbasin Oxnard Subbasin Cumulative Change in Storage
FIGURE 2-23
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
Pumping and Spreading by Calendar Year (Acre-feet)
Annual Change in Storage by Water Year (Acre-feet)
Water Year
Pumping
Below Normal
Wet Above Normal
Dry
Water Year Type
2) Water year is October 1 to September 30 (e.g., water year 2012 is from October 1, 2011, to September 30, 2012)3) Water year type is based on the perce tage of the water year precipitation compared to the 30 year precipitationNormal (≥75% to <100% of average), Dry (≥50% to <75% of average), and Critical (<50% of verage). 1) Estimated Annual Change in Storage is from the United Water Conservation District (UWCD) numerical groundwater model report from July 2018. Estimated Change in Storage is the sum of the Change in Storage from all aquifers in the basin included in the UWCD numerical groundwater model.

Notes:

TotalLASUASSemi-perchedSpreading
020000
40000
60000
80000
100000
120000
140000
-150000
-100000
-50000
0 50000
100000
150000
1024
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-156

INTENTIONALLY LEFT BLANK
1025
Groundwater Sustainability Plan for the Oxnard Subbasin Oxnard Subbasin Annual Change in Storage Without Coastal Flux FIGURE 2-24
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
Pumping and Spreading by Calendar Year (Acre-feet)
Annual Change in Storage by Water Year (Acre-feet)
Water Year
Pumping
Below Normal
Wet Above Normal
Dry
Water Year Type
2) Water year is October 1 to September 30 (e.g., water year 2012 is from October 1, 2011, to September 30, 2012)3) Water year type is based on the perce tage of the water year precipitation compared to the 30 year precipitationNormal (≥75% to <100% of average), Dry (≥50% to <75% of average), and Critical (<50% of verage). 1) Estimated Annual Change in Storage is from the United Water Conservation District (UWCD) numerical groundwater model report from July 2018. Estimated Change in Storage is the sum of the Change in Storage from all aquifers in the basin included in the UWCD numerical groundwater model.

Notes:

TotalLASUASSemi-perchedSpreading
020000
40000
60000
80000
100000
120000
140000
-100000
-80000
-60000
-40000
-20000
0 20000
40000
60000
80000
100000
1026
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-158

INTENTIONALLY LEFT BLANK
1027
Groundwater Sustainability Plan for the Oxnard Subbasin Oxnard Subbasin Cumulative Change in Storage Without Coastal Flux FIGURE 2-25
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
Pumping and Spreading by Calendar Year (Acre-feet)
Annual Change in Storage by Water Year (Acre-feet)
Water Year
Pumping
Below Normal
Wet Above Normal
Dry
Water Year Type
2) Water year is October 1 to September 30 (e.g., water year 2012 is from October 1, 2011, to September 30, 2012)3) Water year type is based on the perce tage of the water year precipitation compared to the 30 year precipitationNormal (≥75% to <100% of average), Dry (≥50% to <75% of average), and Critical (<50% of verage). 1) Estimated Annual Change in Storage is from the United Water Conservation District (UWCD) numerical groundwater model report from July 2018. Estimated Change in Storage is the sum of the Change in Storage from all aquifers in the basin included in the UWCD numerical groundwater model.

Notes:

TotalLASUASSemi-perchedSpreading
020000
40000
60000
80000
100000
120000
140000
-450000
-400000
-350000
-300000
-250000
-200000
-150000
-100000
-50000
0 50000
100000
1028
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-160

INTENTIONALLY LEFT BLANK
1029
FIGURE 2-26
Approximate 2015 North-South Saline Water Intrusion Extent Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: Cross Section: Turner 1975; Based on Plates 7A and 7B (Cross Section A-A’) Interpreted Seawater Inrusion Extent: United Water Conservation District Open File Report, October 2016 Clay Marker Bed / Low Permeability Sediments Lower Aquifer System: Hueneme Aquifer Shallow (“Semi-Perched”) Aquifer Lower Aquifer System: Fox Canyon Lower Aquifer System: Grimes Canyon Aquifer
Upper Aquifer System: Oxnard and Mugu Aquifers
201 Interpreted Saline Water Intrusion Extent
B B’
North South McGrath Fault Bailey Fault
0 -500
-1000
-2000
500
-1500
0 10,000 20,000 30,000 40,000
0 -500
-1000
-2000
500
-1500
Oxnard Subbasin
Mound
Subbasin
Santa Clara River Channel Islands Blvd. Hueneme Road State Hwy 1 Las Posas Syncline 1030
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-162

INTENTIONALLY LEFT BLANK
1031
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-27
Semi-Perched Aquifer Coastal Chloride Concentrations, Fall 2015 Source: UWCD 2016
A2-70
SW-65
SWIFT-65
SCE-38
77 398
1,950 13,000
[£1
Port
Hueneme
Mugu Canyon
Hueneme Road
Well Location, showing well identifiFDtion
and chloride concentraWion (mg//)
HighwaysRoads, arterialsBathymetry 0123 0.5 Miles Ü
1032
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-164

INTENTIONALLY LEFT BLANK
1033
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-28
Oxnard Aquifer Coastal Chloride Concentrations, Fall 2015 Source: UWCD 2016
Port
Hueneme
Mugu Canyon
A2-170
A1-195
CM4-275
CM7-190
CM5-220
SWIFT-205
SCE-220
DP-195
CM6-200
Q2-220
CM1A-220
CM4-200
CM7-110
SCE-130
SW-195
GP1-240
GP2-240
36 40
92 3967
402
374
154
462
159
2,060
1,890
1,100 5,520
1,080
16,700
20,400
[£1
Hueneme Road
Well Location, showing well identification
and chloride concentration (mg/l)
2016 Interpreted Saline Water Intrusion Inland ExtentHighwaysRoads, arterialsBathymetry 2010 TDEM Interpreted Water Quality
Saline!PJO&KORULGHBrackish!PJO&KORULGHSlightly brackish !PJO&KORULGH 012 0.5 Miles Ü 1034
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-166

INTENTIONALLY LEFT BLANKINTENTIONALLY LEFT BLANK
1035
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-29
Mugu Aquifer Coastal Chloride Concentrations, Fall 2015 Source: UWCD 2016
40 35
32 35
35 42
36 35
117
2,900
2,660 2,590
[£1
Port
Hueneme
Mugu Canyon
Hueneme Road
Well Location, showing well identification
and chloride concentration (mg/l)
2016 Interpreted Saline Water Intrusion Inland ExtentHighwaysRoads, arterialsBathymetry 2010 TDEM Interpreted Water Quality
Saline!PJO&KORULGHBrackish!PJO&KORULGHSlightly brackish !PJO&KORULGH CM2-280
A2-320 A1-320
SW-295
CM7-350
CM5-320 DP-330
CM6-330
Q2-285
GP1-315
SCE-320
Q2-370
012 0.5 Miles Ü
1036
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-168

INTENTIONALLY LEFT BLANK
1037
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-30
Hueneme Aquifer Coastal Chloride Concentrations, Fall 2015 Source: UWCD 2016
CM2-760
CM4-760
CM2-520
A2-740 A2-560
A1-680
34 47
42 365
208
10,300
[£1
Port
Hueneme
Mugu Canyon
Hueneme Road
Well Location, showing well identification
and chloride concentration (mg/l)
2016 Interpreted Saline Water Intrusion Inland ExtentHighwaysRoads, arterials 2015 TDEM Interpreted Water Quality
Saline!PJO&KORULGH
Brackish!PJO&KORULGHSlightly brackish !PJO&KORULGH Bathymetry 012 0.5 Miles Ü
1038
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-170

INTENTIONALLY LEFT BLANK
1039
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-31
Fox Canyon Aquifer Coastal Chloride Concentrations, Fall 2015 Source: UWCD 2016
4499
46 3635
35 49
37 43
205
943
1,430
5,140
1,790
[£1
Port
Hueneme
Mugu Canyon
Hueneme Road
Well Location, showing well identification
and chloride concentration (mg/l)
2016 Interpreted Saline Water Intrusion Inland ExtentHighwaysRoads, arterials 2010 TDEM Interpreted Water Quality
Saline!PJO&KORULGHBrackish!PJO&KORULGHSlightly brackish !PJO&KORULGHBathymetry CM2-870
A2-940
A1-930
CM4-1095
CM5-470
CM6-400
SCE-414
GP1-740
DP-450
Q2-640
CM5-940
GP1-460
DP-580
CM6-550
012 0.5 Miles Ü
1040
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-172

INTENTIONALLY LEFT BLANK
1041
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-32
Grimes Canyon Aquifer Coastal Chloride Concentrations, Fall 2015 Source: UWCD 2016
83 40
5,820
4,050
6,060
14,300
[£1
Port
Hueneme
Mugu Canyon
Hueneme Road
Well Location, showing well identification
and chloride concentration (mg/l)
2016 Interpreted Saline Water Intrusion Inland ExtentHighwaysRoads, arterialsBathymetry 2010 TDEM Interpreted Water Quality
Saline!PJ/&KORULGH
Brackish!PJO&KORULGH
Slightly brackish !PJO&KORULGH
CM4-1395
Q2-840
CM5-1200
DP-720
012 0.5 Miles Ü
Q2-970
CM1A-565
1042
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-174

INTENTIONALLY LEFT BLANK
1043
-1000.0
-500.0

0.0 500.0
1000.01500.02000.0
1/1/1985
1/1/1986
1/1/1987
1/1/1988
1/1/1989
1/1/1990
1/1/1991
1/1/1992
1/1/1993
1/1/1994
1/1/1995
1/1/1996
1/1/1997
1/1/1998
1/1/1999
1/1/2000
1/1/2001
1/1/2002
1/1/2003
1/1/2004
1/1/2005
1/1/2006
1/1/2007
1/1/2008
1/1/2009
1/1/2010
1/1/2011
1/1/2012
1/1/2013
1/1/2014
1/1/2015
Monthly Coastal Flux Volume (Acre-feet)
Groundwater Sustainability Plan for the Oxnard Subbasin Groundwater Flux along the Coast in the Upper Aquifer System FIGURE 2-33
-BOEXBSE'MVY
4FBXBSE'MVY
1044
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-176

INTENTIONALLY LEFT BLANK
1045
0 200400600800
1000
1200
1/1/1985
1/1/1986
1/1/1987
1/1/1988
1/1/1989
1/1/1990
1/1/1991
1/1/1992
1/1/1993
1/1/1994
1/1/1995
1/1/1996
1/1/1997
1/1/1998
1/1/1999
1/1/2000
1/1/2001
1/1/2002
1/1/2003
1/1/2004
1/1/2005
1/1/2006
1/1/2007
1/1/2008
1/1/2009
1/1/2010
1/1/2011
1/1/2012
1/1/2013
1/1/2014
1/1/2015
Monthly Coastal Flux Volume (Acre-feet)
Groundwater Sustainability Plan for the Oxnard Subbasin Groundwater Flux along the Coast in the Lower Aquifer System FIGURE 2-34
-BOEXBSE'MVY
1046
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-178

INTENTIONALLY LEFT BLANK
1047
Groundwater Sustainability Plan for the Oxnard Subbasin Selected Historical Records of Water Elevation and Chloride Concentration FIGURE 2-35
1995 2000 2005 2010 2015
í í 0 10 20 30
A: 01N22W20M05S
Region: Port Hueneme; Screened Aquifer: Oxnard; Screened Aquifer System: UAS Year
Water Elevation (ft above mean sea level)
0 2000 6000 10000
Chloride (mg/L)
Water Elevation Chloride Concentration
Top of screen: 150 ft bgs; Bottom of screen: 170 ft bgs 1990 1995 2000 2005 2010 2015
í í 0 10 20 30
B: 01N22W29D03S
Region: Port Hueneme; Screened Aquifer: Hueneme; Screened Aquifer System: LAS Year
Water Elevation (ft above mean sea level)
0 500 1500 2500
Chloride (mg/L)
Water Elevation Chloride Concentration
Top of screen: 500 ft bgs; Bottom of screen: 520 ft bgs 1990 1995 2000 2005 2010 2015
í í 0 20
C: 01N22W29D02S
Region: Port Hueneme; Screened Aquifer: Hueneme; Screened Aquifer System: LAS Year
Water Elevation (ft above mean sea level)
6000 8000 12000
Chloride (mg/L)
Water Elevation Chloride Concentration
Top of screen: 720 ft bgs; Bottom of screen: 760 ft bgs 1990 1995 2000 2005 2010 2015
í í í 0
D: 01S21W08L03S
Region: Point Mugu; Screened Aquifer: Grimes; Screened Aquifer System: LAS Year
Water Elevation (ft above mean sea level)
0  8000 12000
Chloride (mg/L)
Water Elevation Chloride Concentration
Top of screen: 525 ft bgs; Bottom of screen: 565 ft bgs 1048
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-180

INTENTIONALLY LEFT BLANK
1049
!H!(
!(
!(
!(
!H!(
!(
!H
!H
!(
!( !( !H
!H
!H!(
!H
!H
!H
!(
!H !(
!H
!H
!H
Point
Mugu
North
Coast
Port
Hueneme
Northwest
SWIM Area
Central
SWIM Area
South
Coast
232 ?
?34
?1
Pacific Ocean
£¤101
Oxnard
Port Hueneme
Camarillo
Bailey Fault
Somis
Fault
Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Conejo Creek
Revolon S lough
Santa Clara River
Call e guas Creek
T02N
T01N
T01S
R23W R22W R21W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Oxnard Blvd
Ventura Rd
5th St 5th St
5th St
Lewis Rd
Ventura Rd
31A05-08
31A09
31L01
32A01
32K01
32Q01
32Q02-07
20E01
20J04-08
20M01-06
20N02
26J04-05
26K04
26M03
27C02-04
27R01 27R03-05
28G01-05
29D01-04
35E01-05
36B02
36K05-09
36L01
01C02-05
08L03-04
01H01-04
Bailey
Fault
Camarillo Fault
Springville Fault Zone
Santa Monica Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 3/27/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Coastal Wells for Section 2.3.3_repaired.mxd 02 1 n Miles
FIGURE 2-36
Locations of Selected Coastal Wells with Historical Measurements of Chloride Concentration and Water Elevation Notes:
1) Single well labels consist of an italicized
abbreviated State Well Number (SWN).

SWNs are based on Township and Range
in the Public Land Survey System. To
construct a full SWN from the abbreviation
shown on the map, concatenate the
Township, Range, abbreviation, and the
letter "S". Example: the SWN for the well
labeled "20E01" located in Township 01N
(T01N) and Range 22W (R22W) is
01N22W20E01S.
2) Labels for nested well sets indicate the
range of the last two digits in the SWNs
completed in each set. Example: The SWNs
completed in the nested set labeled
"01H01-04," located in Township 01S (T01S)
and Range 22W (R22W) are 01S22W01H01S,
01S22W01H02S, 01S22W01H03S, and
01S22W01H04S.
3) Aquifer designation information for
individual wells was provided by FCGMA,
CMWD and UWCD.
15P01
Abbreviated State Well Number
(see notes)
Legend
!H Nested Well Set
!( Single Well
Regions for SWI Characterization
Fox Canyon Groundwater
Management Agency Boundary
(FCGMA 2016)
Township (North-South) and Range
(East-West)
Faults (Ventura County 2016)
Major Rivers/Stream Channels
Revised Bulletin 118
Groundwater Basins and
Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
1050
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-182

INTENTIONALLY LEFT BLANK
1051
)
J
J
J
J
J
J
JJ
J
J
"J"J
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Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
Revolon Slough
Santa Clara River
18Q02
940
18Q03
968
19K03
830
21D03
800
21N02
1110 28G01
29B03 1920
953
29C01
840
29G01
1710
29K02
829
30C04
772 30K01
976
06B01
1170
06R02
1310
12M01
1110
13N02
1230
15C01
1490
24C02
1070
25K01
4280
07F01
1140
18B01
1800
19A01
2230
20M03
4030
29N06
1872
01R02
1930
11J01
1330
14H03
1160
19P01
1710
21M01
1150
22R04
900
23K05
1640
24A01
1420
24R02
25A02 1300
1710
25E01
1720
25F01
2120
25P04
1700
26C01
2020
26C05
2100
26E01
1680
27A01
987
27K01
1480
27L01
1010
27M02
2000
28H02
1740
31B01
1090 31D02
1090
32C04
1100
36F02
1340
25G02
2540
25M01
1230
36A04
1070
19L11
851
20C05
700
31A07
779
32Q05
6860
32Q07
6410
20J07
817
20M04
906
26J03
860
27C02
652
27R03
842
29D04
993
35E04
667
36K08
781
01H03
8370
13N05
831
14G04
1100
23B07
1210
24P01
927
36E04
1500
?23
232 ?
126 ?
?34
?1
118 ?
£¤101
06L04
NM
19K08
NM
01M02
NM
11C02
NM
07L07
NM
07M04
NM
19G01
23F05 NM
NM
31R04
NM
19L12
962 19L13
856
31A08
781
31A09
871
32Q06
1650
03F07
1200
03F08
1600
03F12
1300
03F14
1300
20J08
1500
20M05
2480 26J04
3680
27C03
1830
27R04
6740 27R05
49600
28G04
11800 28G05
1190
35E05
910 36K09
1780
01C05
848
08L04
31300
01H04
6400
11J02
11Q01 954
1110
12F03
1610
12F04
1050
12G03
800
12J02
1870
12Q06
1700
12R04
1040
13C01
724
13N06
1060
14A09
1340
14D01
880
14F03
957
14G07
1240
15L01
1120
15P01
918
15R02
1390
16R02
1150 23B08
1750
23B09
1230
23H06
1860
36E05
1500
T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-37A
Upper Aquifer System - Most Recent Total Dissolved Solids (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
TDS concentration (mg/L), 2011-2015
") 290 - 500
") >500 - 750
") >750 - 1000
") >1000 - 1200
") >1200 - 2500
") >2500 - 49,800
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1052
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-184

INTENTIONALLY LEFT BLANK
1053
J"
J"
J"
J"
J"
J"
"J
"J
"J
"J
"J
"J
"J
"J
"J
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"J
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"J
"J
XW
XW
XW
XW
XW
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
Camarillo
Santa Clara River
07F01
1140
18B01
1800
19A01
2230
20M03
4030
29N06
1872
01R02
1930
11J01
1330
12B08
1130
13M01
990
14H03
1160
14L05
1100
14P02
1330
14P03
1180
21M01
1150 22R02
1010
22R04
900
23B01
1540
23C01
1180
23C02
1080
23C05
1070
23C06
1210
23F01
1060 23G03
1240
23H03
1800
23K05
1640
24A01
1420
24R02
1300
25A02
1710
25E01
1720
25F01
2120
25P04
1700
26C01
26C05 2020
2100
26E01
1680
27A01
987
27K01
1480 27L01
1010
27M02
2000
28H02
1740
32C04
1100
?1
232 ?
126 ?
118 ?
07L06
1690
13N05
831
14G04
1100
23B07
1210
24P01
927
£¤101
07L07
NM
07M04
NM
19G01
NM
12H01
NM
12J04
NM
23F05
NM
11J02
954
11Q01
1110
12F03
1610
12F04
1050
12G03
800
12J02
1870
12Q06
1700
12R04
1040
13C01
724
13N06
1060 13N07
1640
14A09
1340
14D01
880 14F03
957
14G06
1240
14G07
1240
14G08
1270
15L01
1120
15P01
918
15R02
1390
16R02
1150
23B08
1750
23B09
1230
23H06
1860
T02N
R21W
R22W
Central Ave
Oxnard Blvd
Oxnard
B vl d
Ventura Rd
Camar ill o
Hills
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping_Forebay Zoom.mxd 0 1 2 n Miles
FIGURE 2-37B
Upper Aquifer System, Forebay Area - Most Recent Total Dissolved Solids (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
TDS concentration (mg/L), 2011-2015
") 290 - 500
") >500 - 750
") >750 - 1000
") >1000 - 1200
") >1200 - 2500
") >2500 - 49,800
Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix C. 2) "ND" signifies non-detect. "NM" signifies not measured. 3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. A solid gray well symbol has no data between 2011 and 2015. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.
") Not Measured (NM)
1054
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-186

INTENTIONALLY LEFT BLANK
1055
(
H
H
H
H
H
H
(
$+
$+
$+ $+
$+
!H
!H
!H
!H
!H
!H
!H
!H !H !H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H !H
!H
!H
!H
!H
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!H
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!(
!(
#*
#*
#*
#*
#*
#* #*
#*
#*
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#*
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#*#
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
Revolon
Slough
Santa Clara River
03F05
980
16D04
859
19A01
600
20J05
840 20M02
1140
26M03
902
28G03
584
29D02
24200
01C03
940
01C04
840
19J03
1140
22Q05
980
23B05
1010
23B06
1040
36E02
950 36E03
990
19L10
858
31A05
786
31A06
465
32Q04
11900
20J04
860
20M01
937
26K03
883
28G02
673
29D01
869
35E02
671
35E03
392 36K06
4320
36K07
2150
01C02
518
01H02
3520
07L03
1200
07L04
1060
23B03
504
?23
232 ?
126 ?
?34
?1
118 ?
£¤101
32Q02
10900 32Q03
37200
28G01
531
35E01
691
36K05
14200
08L03
11700
04D04
979
06L05
882
08R01
772
16M03
975
16P04
933
17B02
859
19J05
449
20K03
630
21H02
867
21H03
650
22C01
830
28D01
886
28M01
1120
29B06
754
12N03
912
20J06
623
21B03
956
23R02
1050
24B04
878
25K02
762
26D05
971
26P02
803
27H02
888
36B01
733
36B02
809
36H01
1060
01H01
1200
19G03
948 20M06
966 20Q05
972
13N02
900
13N04
1080
20K01
1048
20L03
1322
23H04
1000
24P02
995
30F03
944
06J05
NM
07J02
NM
32C01
NM
01M03
NM
13D03
NM
07P03
NM
19A03
NM
32E01
NM
T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-38
Lower Aquifer System - Most Recent Total Dissolved Solids (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
TDS concentration (mg/L), 2011-2015
!( 290 - 500
!( >500 - 750
!( >750 - 1000
!( >1000 - 1200
!( >1200 - 2500
!( >2500 - 49,800
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1056
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-188

INTENTIONALLY LEFT BLANK
1057
"J"J
"J
"J
"J
"J
"J
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XW
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")
")
")
")
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")
")
") ")
")
")
") ")
")
")
")
")
")
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
Revolon Slough
Santa Clara River
18Q02
18Q03 78
70 19K03
54 21D03
54 21N02
113 28G01
510
29B03
29C01 84
56 29G01
390 29K02
51 30C04
58 30K01
163
06B01
55 06R02
56 11C02
23 12M01
46 13N02
56 15C01
70 24C02
48 25K01
1650
18B01
108
19A01
250
19G01
56 20M03
349
29N06
178
01R02
108 12B08
66 12H01
120
12J04
76 14L05
50 14P02
78 19P01
97 21M01
62 22R02
72 23C02
64 23K05
81 24A01
72 24R02
25A02 67
108
25E01
66 25F01
86 25P04
69 26C01
92 26C05
82 26E01
83 27A01
62 27L01
58 27M02
99 28H02
78 31B01
53 31D02
53 32C04
54 36F02
58 25G02
180
25M01
63 36A04
50 19L11
36 20C05
38 31A07
40 32Q05
2630
32Q07
2570
20J07
35 20M04
42 26J03
37 27C02
35 27R03
35 29D04
126
35E04
32 36K08
35 01H03
2940
07L06
96 23B07
66 24P01
46 36E04
60 ?23
232 ?
126 ?
?34
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£¤101
19L12
67 19L13
39 31A08
36 31A09
40 32Q06
402
03F07
70 03F08
67 20J08
190
20M05
1030
26J04
1100
27C03
406
27R04
1700
27R05
20700
28G04
5130 28G05
149
35E05
92 36K09
651
01C05
40 08L04
16700
01H04
2180
11J02
11Q01 49
54 12F03
104
12F04
68 12G03
36 12J02
103
12Q06
114
13C01
47 13N06
51 13N07
78 14D01
58 14F03
50 14G06
60 14G07
60 14G08
59 15L01
47 15P01
39 15R02
78 16R02
49 23B08
79 23B09
65 36E05
57 T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-39A
Upper Aquifer System - Most Recent Chloride (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Chloride concentration (mg/L), 2011-2015
") 23 - 100
") 101 - 150
") 151 - 200
") 201 - 500
") 501 - 1000
") 1001 - 22500
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1058
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-190

INTENTIONALLY LEFT BLANK
1059
J"
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
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"J
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"J"J
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"J
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XW
XW
XW
XW
XW
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")
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")
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07F01
70 07L07
92 07M04
84 18B01
108
19A01
250
19G01
56 20M03
349
29N06
178
01R02
108
11J01
61 12B08
66 12H01
120 12J04
76 13M01
55 14H03
82 14L05
50 14P02
78 14P03
56 21M01
62 22R02
72 22R04
61 23B01
73 23B02
23C01 71
64 23C02
64 23C05
54 23C06
72 23F01
56 23G03
69 23G04
90 23H03
74 23K05
81 24A01
72 24R02
67 25A02
108
25E01
66 25F01
86 25P04
69 26C01
92 26C05
82 26E01
83 27A01
62 27K01
94 27L01
58 27M02
99 28H02
78 32C04
54 07L06
96 13N05
37 14G05
63 24P01
46 Camarillo
Santa Clara River
?1
232 ?
126 ?
118 ?
£¤101
11J02
49 11Q01
54 12F03
104
12F04
68 12G03
36 12J02
103
12Q06
114
12R04
70 13C01
47 13N06
51 13N07
78 14A09
69 14D01
58 14F03
50 14G06
60 14G07
60 14G08
59 15L01
47 15P01
39 15R02
78 16R02
49 23B08
79 23B09
65 23H06
78 23F05
NM
T02N
R21W
R22W
Central Ave
Oxnard Blvd
Oxnard
Blvd
Ventura Rd
Camar ill o
Hills
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping_Forebay Zoom.mxd 0 1 2 n Miles
FIGURE 2-39B
Upper Aquifer System, Forebay Area - Most Recent Chloride (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
Chloride concentration (mg/L), 2011-2015
") 23 - 100
") 101 - 150
") 151 - 200
") 201 - 500
") 501 - 1000
") 1001 - 22500
Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix C. 2) "ND" signifies non-detect. "NM" signifies not measured. 3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. A solid gray well symbol has no data between 2011 and 2015. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.
") Not Measured (NM)
1060
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-192

INTENTIONALLY LEFT BLANK
1061
$+
$+
$+
$+
$+
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Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
R evolon
Slough
Santa Clara River
03F05
48 16D04
39 19A01
36 20J05
42 20M02
208
20M03
47 26M03
37 28G03
34 29D02
10300
29D03
436
01C03
37 01C04
33 19J03
56 22Q05
48 23B04
47 23B05
47 26B03
54 36E02
48 36E03
53 06J05
43 19L10
37 31A05
99 31A06
44 32Q04
5070
20J04
43 26K03
43 28G02
35 29D01
49 35E02
36 35E03
35 36K06
1790
36K07
943
01C02
33 01H02
1430
07L03
65 07L04
56 32E01
56 23B03
76 ?23
232 ?
126 ?
?34
?1
118 ?
£¤101
32Q02
4050 32Q03
14300
28G01
40 35E01
83 36K05
6060
08L03
5560
04D04
126
06L05
45 07J02
36 08R01
58 16M03
122
16P04
144
17B02
37 19J05
41 19L08
34 20B01
62 20K03
39 21H02
107
21H03
44 22C01
103
28D01
135
28M01
269
29B06
51 01M03
40 12N03
36 13D03
38 17C03
43 20J06
35 21B03
93 21B06
49 23R02
55 24B04
39 25K02
35 26D05
48 26P02
36 27H02
37 36B01
49 36B02
103
36H01
250
01H01
205
07P04
54 19A03
137
19G03
45 20M06
50 20Q05
60 13N02
52 13N04
71 20K01
51 20L03
69 23H04
56 24P02
47 25J01
50 30F03
42 T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-40
Lower Aquifer System - Most Recent Chloride (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Chloride concentration (mg/L), 2011-2015
!( 23 - 100
!( 101 - 150
!( 151 - 200
!( 201 - 500
!( 501 - 1000
!( 1001 - 22500
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1062
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-194

INTENTIONALLY LEFT BLANK
1063
"J"J
"J
"J
"J
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XW
XW
XW
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XW
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XW XW
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") ") ")
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") ") ")
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")
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Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
Revolon Slough
Santa Clara River
28G01

0.5 29B03

0.6 01M02

3.094
06B01

16.6 06R02

7.4 15C01

0.8 07L07

3.5 18B01
120
19A01
92 19G01

19.6 20M03
127
01R02

2.91 11J01

10.5 12H01

8.6 12J04

4.3 13M01

11.5 14P02
31 19P01

33.1 21M01

13.1 22R04

28.73 23C02
39 23F05

6.188
23H03
112 23K05
134
24A01

58.9 24R02

19.2 25A02

7.7 25E01

70.7 25F01
1 25P04

9.3 26C01
240 26C05
163.098
26E01

70.3 27A01

21.9 27K01

22.984
27L01

23.868 27M02

0.4 28H02

19.5 31B01

18.5 31D02

17.9 31R04

25.5 32C04

22.9 36F02

7.9 25G02

59.3 25M01

11.1 36A04

10.2 18Q02
18Q03 ND
ND
19K03
ND
19K08
ND
21D03
ND
21N02
ND
29C01
29G01 ND
ND
29K02
ND
30C04
ND 30K01
ND
11C02
ND
12M01
ND
13N02
ND 24C02
ND
25K01
ND
29N06
ND
07L06

4.57 14G04

7.02 23B07
86 24P01

6.4 36E04

70.72 19L11
ND
20C05
ND
31A07
ND
32Q05
ND
32Q07
ND
20J07
20M04 ND
ND
26J03
ND
27C02
ND
27R03
ND
29D04
ND
35E04
ND
36K08
ND
01H03
ND ?23
232 ?
126 ?
?34
?1
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£¤101
06L04
ND
19L12
ND19L13
ND
31A08
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31A09
ND
32Q06
ND
20M05
ND
26J04
ND
27C03
ND
27R04
ND
27R05
ND
28G04
ND 28G05
ND
35E05
ND
36K09
ND
01C05
ND
08L04
ND
01H04
ND
03F07

19.006
03F08
34 03F12

37.128
03F13

28.73 20J08

14.2 11J02

11.4 11Q01

6.42 12F03

7.54 12F04

7.08 12G03
5 12J02

3.99 12Q06

8.86 13C01

7.37 13N06
44 13N07
141
14D01

7.62 14F03

10.5 14G07
16 15L01

16.4 15P01

6.51 15R02

20.4 16R02
9 23B08
134
23H06
116
36E05
57 T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-41A
Upper Aquifer System - Most Recent Nitrate (mg/L as Nitrate) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Nitrate concentration (mg/L as Nitrate), 2011-
2015
") 0 - 10
") >10 - 22.5
") >22.5 - 45
") >45 - 90
") >90 - 528
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1064
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-196

INTENTIONALLY LEFT BLANK
1065
"J
"J
"J
"J
"J
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")
")
")
")
")
")
")
")
")
"")
")
")
")
")
")
")
")
")
")
")
")
Camarillo
Santa Clara River
29N06
ND
12B08
ND
07F01

4.7 07L07

3.5 07M04

6.3 18B01
120
19A01
92 19G01

19.6 20M03
127
01R02

2.91 11J01

10.5 12H01

8.6 12J04

4.3 13M01

11.5 14H03

0.9 14L05

14.6 14P02
31 14P03

11.5 21M01

13.1 22R02

38.012 22R04

28.73 23B01
117
23B02

93.4 23C01

20.6 23C05

31.9 23C06

23.9 23F01
9 23F05

6.188 23G03

75.3 23H03
112
23K05
134
24A01

58.9 24R02

19.2 25A02

7.7 25E01

70.7 25F01
1 25P04

9.3 26C01
26C05 240
163.098
26E01

70.3 27A01

21.9 27K01

22.984 27L01

23.868
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0.4 28H02

19.5 32C04

22.9 ?1
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126 ?
118 ?
£¤101
07L06

4.57 13N05

10.5 14G04

7.02 14G05

10.5 23B07
86 24P01

6.4 11J02

11.4 11Q01

6.42 12F03

7.54 12F04

7.08 12G03
5 12J02

3.99 12Q06

8.86 12R04

4.59 13C01

7.37 13N06
44 13N07
141
14A09

12.8 14D01

7.62 14F03

10.5 14G06
16 14G07
16 15L01

16.4 15P01

6.51 15R02

20.4 16R02
9 23B08
134
23B09

19.6 23H06
116
T02N
R21W
R22W
Central Ave
Oxnard Blvd
Oxnard
Blvd
Ventura Rd
Camar ill o
Hills
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping_Forebay Zoom.mxd 0 1 2 n Miles
FIGURE 2-41B
Upper Aquifer System, Forebay Area - Most Recent Nitrate (mg/L as Nitrate) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
Nitrate concentration (mg/L), 2011-2015
") 0 - 10
") >10 - 22.5
") >22.5 - 45
") >45 - 90
") >90 - 528
Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix C. 2) "ND" signifies non-detect. "NM" signifies not measured. 3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. A solid gray well symbol has no data between 2011 and 2015. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.
") Not Measured (NM)
1066
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-198

INTENTIONALLY LEFT BLANK
1067
$+
$+
$+
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!H
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!H
!H
!H
!H !H
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!H
!H
!(
!(
!( !(
!(
!(
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!(
!(
!(
#*
#*
#*
#*
#* #*
#*
#*
#*
#*
#*
#*#*
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
R evolon
Slough
Santa Clara River
03F05

18.122
16D04

0.6 19A01

0.5 26M03

5.2 19J03
1 22Q05

12.9 23B06

15.9 26B03

6.64 36E02

8.398
20M02
ND
28G03
ND
29D02
ND
23B04
ND
36E03
ND
32E01

0.4 06J05
ND
20M01
ND
26K03
ND
28G02
ND
29D01
ND
35E02
ND
35E03
ND
01H02
ND
07L03
ND
07L04
ND
23B03
ND
?23
232 ?
126 ?
?34
?1
118 ?
£¤101
32Q02
ND 32Q03
ND
28G01
ND
35E01
ND
07J02
ND 16M03
ND
16P04
ND
17B02
ND
20B01
ND
21H02
21H03ND
ND 29B06
ND
12N03
ND
17C03
ND
25K02
ND
26P02
ND
36B01
36H01 ND
ND
19G03
ND 20M06
ND
13N02
ND
23H04
ND
04D04

0.5 06L05

1.1 08R01

0.5 19J05

0.4 20K03

1.9 22C01

0.5 28D01

0.5 28M01

0.4 01M03

0.4 13D03

0.4 21B03

0.6 23R02

22.1 24B04
1 26D05
15 27H02

0.5 36B02

0.4 01H01

0.71 19A03

57.3 20Q05

0.6 13N04

9.3 20K01

13.5 20L03
18 24P02

7.1 25J01

14.144
30F03

0.5 T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-42
Lower Aquifer System - Most Recent Nitrate (mg/L as Nitrate) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Nitrate concentration (mg/L), 2011-2015
!( 0 - 10
!( >10 - 22.5
!( >22.5 - 45
!( >45 - 90
!( >90 - 528
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1068
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-200

INTENTIONALLY LEFT BLANK
1069
"J"J
"J
"J
"J
"J
"J
"J
"J"J
"J
"J
"J
"J
"J
"J
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"J
"J
"J
"J
"J
"J
"J
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"J
"J
"J
"J"J
"J
"J
"J
"J
"J
"J
"J "J
"J "J "J "J"J
"J
"J"J
"J "J
"J
"J
"J
"J
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"J
"J"J
"J
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"J
"J
"J
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XW
XW
XW
XW
XW XW
XW
XW
XW
XW
XW XW
XW
XW
XW
XW
XW
XW
XW
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")")")")
")
")
")
")
")
"")
")"
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")
")
")
")
")
")
")
")
")
")
")
")
")
") ") ")
")
")
") ") ")
")") ")
")
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
RevolonSlough
Santa Clara River
18Q02
18Q03 440
341
19K03
330
21D03
301
21N02
370 28G01
540
29B03
340
29C01
360 29G01
630 29K02
350
30C04
320
30K01
361
06B01
510
06R02
630
11C02
942
12M01
530
13N02
620
15C01
840
24C02
440
18B01
746
19A01
941
19G01
490
20M03
2050
29N06
867
01R02
803
12B08
531
14H03
710
14P02
700
19P01
820
21M01
514
22R02
460
22R04
450
23C02
530 23H03
840
23K05
820
24A01
636
24R02
25A02 650
860
25E01
820
25F01
1170
25P04
890
26C01
810
26C05
1020
26E01
755
27A01
383
27K01
570
27L01
390
27M02
830
28H02
750
31B01
490 31D02
490
32C04
500
36F02
680
25G02
1440
25M01
540
36A04
440
19L11
379
20C05
370
31A07
327
32Q05
527
32Q07
481
20J07
20M04 313
361
26J03
290
27C02
185
27R03
362
29D04
381
35E04
190
36K08
344
01H03
528
07L06
674
23B07
576
24P01
380
36E04
780
?23
232 ?
126 ?
?34
?1
118 ?
£¤101
19L12
417 19L13
337
31A08
351
31A09
364
32Q06
337
03F07
560
03F08
830
03F12
690
03F14
1000
20J08
451
20M05
445
26J04
440
27C03
553
27R04
480 27R05
5740
28G04
1050 28G05
469
35E05
297
36K09
100
01C05
345
08L04
2290
01H04
116
11J02
444 11Q01
502
12F03
822
12F04
530
12G03
360
12J02
806
12Q06
846
12R04
451
13C01
363
13N06
463
14A09
621
14D01
428
14F03
448
14G06
566
14G07
566 15L01
455
15P01
380
15R02
667
16R02
473 23B08
873 23H06
846
36E05
730
T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-43A
Upper Aquifer System - Most Recent Sulfate (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Sulfate concentration (mg/L), 2011-2015
") 29 - 300
") 301 - 600
") 601 - 1000
") 1001 - 5740
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1070
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-202

INTENTIONALLY LEFT BLANK
1071
J"
"J
"J
"J
"J
"J
"J
"J
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XW
XW
XW
XW
XW
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
Camarillo
Santa Clara River
07F01
480
07L07
750
07M04
570
18B01
746
19A01
941
19G01
490
20M03
2050
29N06
867
01R02
803
11J01
583
12B08
531
12H01
920
12J04
460
13M01
470
14H03
710
14L05
480
14P02
700
14P03
551
21M01
514 22R02
460 22R04
450
23B01
680
23B02
610
23C01
580
23C02
530
23C05
450
23C06
650
23F01
485 23G03
580
23G04
850
23H03
840
23K05
820
24A01
636
24R02
650
25A02
860
25E01
820
25F01
1170
25P04
890
26C01
26C05 810
1020
26E01
755
27A01
383
27K01
570 27L01
390
27M02
830
28H02
750
32C04
500
07L06
674
13N05
338
14G04
547
23B07
576
24P01
380
?1
232 ?
126 ?
118 ?
£¤101
23F05
NM
11J02
444
11Q01
502
12F03
822
12F04
530
12G03
360
12J02
806
12Q06
846 12R04
13C01 451
363
13N06
463 13N07
698
14A09
621
14D01
428 14F03
448
14G06
566
14G07
566
14G08
603
15L01
455
15P01
380
15R02
667
16R02
473
23B08
873
23B09
716
23H06
846
T02N
R21W
R22W
Central Ave
Oxnard Blvd
Oxnard
B vl d
Ventura Rd
Camar ill o
Hills
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping_Forebay Zoom.mxd 0 1 2 n Miles
FIGURE 2-43B
Upper Aquifer System, Forebay Area - Most Recent Sulfate (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
Sulfate concentration (mg/L), 2011-2015
") 29 - 300
") 301 - 600
") 601 - 1000
") 1001 - 5740
Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix C. 2) "ND" signifies non-detect. "NM" signifies not measured. 3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. A solid gray well symbol has no data between 2011 and 2015. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.
") Not Measured (NM)
1072
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-204

INTENTIONALLY LEFT BLANK
1073
$+
$+
$+
!H
!H
!H
!H
!H
!H
!H
!H
!H !H
!H
!H
!H
!H
!H
!H
!H !H
!H
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!H
!H
!H
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!H
!H !H
!H
!H
!H
!H
!H
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!H !H
!H
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!(
!(
!( !(
!(
!(
!(
!(
!(
#*
#*
#*
#*
#* #*
#*
#*
#*
#*
#*#
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
R evolon
Slough
Santa Clara River
03F05
480
16D04
360
19A01
272
20M03
364
26M03
370
28G03
40 29D02
1570
19J03
510
22Q05
470
23B04
382 23B05
467
23B06
484
36E02
470 36E03
500
?23
232 ?
126 ?
?34
?1
118 ?
06J05
181
20M01
391 26K03
360
28G02
235 29D01
392
35E02
224 35E03
0 01H02
139
07L03
511 07L04
457
32E01
340
23B03
15 £¤101
32Q02
672 32Q03
2030
28G01
84 35E01
166
04D04
186
06L05
330
07J02
360 08R01
240
16M03
250
16P04
197
17B02
320
19J05
45 20K03
230
21H02
260
21H03
126
22C01
188
28D01
213
28M01
220
29B06
331
01M03
390
12N03
370
13D03
360
21B03
360
23R02
480
24B04
380
25K02
290
26D05
390
26P02
280
27H02
370
36B01
321
36B02
230
36H01
217
01H01
2 19A03
700
19G03
420 20M06
390 20Q05
360
13N04
530
20K01
486
20L03
605
24P02
430 30F03
390
T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-44
Lower Aquifer System - Most Recent Sulfate (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Sulfate concentration (mg/L), 2011-2015
!( 29 - 300
!( 301 - 600
!( 601 - 1000
!( 1001 - 5740
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1074
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-206

INTENTIONALLY LEFT BLANK
1075
"J"J
"J
"J
"J
"J
"J
"J
"J"J
"J
"J
"J
"J
"J
"J
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"J
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"J "J
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XW
XW
XW
XW
XW XW
XW
XW
XW
XW
XW XW
XW
XW
XW
XW
XW
XW
XW
")
")
")
")
")")
")
")
")
")
"")
")
") ")
")
")
")
")
")
")
")
")
")
")
")
")
")
") ") ")
")
")
") ") ")
")") ")
")
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
Revolon Slough
Santa Clara River
18Q02
18Q03 0.7

0.7 19K03

0.7 21D03

0.4 21N02

0.5 28G01

0.5 29B03

0.5 29C01
29G01 0.8

0.9 29K02

0.6 30C04

0.7 30K01

0.69 06B01

0.8 06R02

0.8 11C02

0.97 12M01

0.7 13N02

0.8 15C01

0.8 24C02

0.7 25K01

0.9 07F01

0.8 18B01

0.78 19A01

0.7 19G01

0.8 20M03

1.2 29N06

0.58 01R02

0.96 11J01

0.78 12B08

0.7 19P01

0.6 21M01

0.72 22R02

0.7 22R04

0.6 23K05

0.7 24A01

0.05 24R02

0.8 25A02
25E01 1

1.1 25F01
25P04 1

0.9 26C01

0.9 26C05

0.9 26E01

0.84 27A01

0.6 27K01

0.9 27L01

0.6 27M02

1.1 28H02

1.08 31B01

0.7 31D02

0.7 32C04

0.6 36F02

0.8 25G02

0.8 25M01

0.6 36A04

0.6 19L11

0.56 20C05

0.7 31A07

0.49 32Q05

0.5 32Q07

0.44 20J07
20M04 0.67

0.65 26J03

0.49 27C02

0.68 27R03

0.67 29D04

0.67 35E04

0.66 36K08

0.59 01H03

0.68 07L06

0.8 13N05

0.54 23B07

0.56 24P01

0.6 36E04

0.9 ?23
232 ?
126 ?
?34
?1
118 ?
£¤101
19L12

0.67 19L13

0.67 31A08

0.63 31A09

0.64 32Q06

0.55 03F07

0.7 03F08

0.9 20J08

0.81 20M05

0.87 26J04

0.76 27C03

0.83 27R04

0.74 27R05

5.93 28G04

1.06 28G05

0.82 35E05

0.67 36K09

0.61 01C05

0.69 08L04

3.16 01H04

0.72 11J02
11Q01 0.56

0.59 12F03

0.77 12F04

0.63 12G03

0.5 12J02

0.92 12Q06

0.89 12R04

0.68 13N06

0.56 13N07

0.72 14A09
14D01 0.83

0.5 14F03

0.7114G06

0.66 14G07

0.66 14G08

0.63 15L01

0.52 15P01

0.55 15R02

0.69 16R02

0.58 23B09

0.8 23H06

0.79 36E05

0.9 T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-45A
Upper Aquifer System - Most Recent Boron (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Boron concentration (mg/L), 2011-2015
") 0 - 0.2
") >0.2 - 0.5
") >0.5 - 1.0
") >1.0 - 2.0
") >2.0 - 6.0
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1076
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-208

INTENTIONALLY LEFT BLANK
1077
J"
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J
"J"J
"J
"J "J
"J
"J
"J
"J
"J
"J "J
"J
"J
"J
"J
"J
"J
"J
"J"J
"J
"J
"J "J
"J
"J
"J
XW
XW
XW
XW
XW
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
Camarillo
Santa Clara River
07F01

0.8 07L07

0.8 07M04

0.7 18B01

0.78 19A01

0.7 19G01

0.8 20M03

1.2 29N06

0.58 01R02

0.96 11J01

0.78 12B08

0.7 12H01

0.9 12J04

0.6 13M01

0.5 14H03

0.4 14L05

0.6 14P02

0.7 14P03

0.64 21M01

0.72 22R02

0.7 22R04

0.6 23B01

0.7 23B02

0.6 23C01

0.7 23C02

0.6 23C05

0.7 23C06

0.6 23F01

0.7 23G03

0.7 23G04

0.8 23H03

0.8 23K05

0.7 24A01

0.05 24R02

0.8 25A02
1 25E01

1.1 25F01
1 25P04

0.9 26C01
26C05 0.9

0.9 26E01

0.84 27A01

0.6 27K01

0.9 27L01

0.6 27M02

1.1 28H02

1.08 32C04

0.6 ?1
232 ?
126 ?
118 ?
£¤101
07L06

0.8 13N05

0.54 14G04

0.63 23B07

0.56 24P01

0.6 11J02

0.56 11Q01

0.59 12F03

0.77 12F04

0.63 12G03

0.5 12J02

0.92 12Q06

0.89 12R04

0.68 13C01

0.61 13N06

0.56 13N07

0.72 14A09

0.83 14D01

0.5 14F03

0.71 14G06

0.66 14G07

0.66 14G08

0.63 15L01

0.52 15P01

0.55 15R02

0.69 16R02

0.58 23B08

0.78 23B09

0.8 23H06

0.79 23F05
NM
T02N
R21W
R22W
Central Ave
Oxnard Blvd
Oxnard
B vl d
Ventura Rd
Camar ill o
Hills
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping_Forebay Zoom.mxd 0 1 2 n Miles
FIGURE 2-45B
Upper Aquifer System, Forebay Area - Most Recent Boron (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Wells screened in multiple aquifers in the UAS
Boron concentration (mg/L), 2011-2015
") 0 - 0.2
") >0.2 - 0.5
") >0.5 - 1.0
") >1.0 - 2.0
") >2.0 - 6.0
Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix C. 2) "ND" signifies non-detect. "NM" signifies not measured. 3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. A solid gray well symbol has no data between 2011 and 2015. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.
") Not Measured (NM)
1078
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-210

INTENTIONALLY LEFT BLANK
1079
$+$+
$+
$+
!H
!H
!H
!H
!H
!H
!H
!H
!H !H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H
!H !H
!H
!H
!H
!H
!H
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!H
!H !H
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!(
!(
!( !(
!(
!(
!(
!(
!(
!(
#*
#*
#*
#* #*
#*
#*
#*
#*
Pacific Ocean
Ventura
Oxnard
Port Hueneme
Camarillo
Thousand Oaks
Arroyo Las Posas
Arroyo Conejo
Arroyo Santa Rosa
Calleguas Creek
Arroyo Simi
Conejo Creek
R evolon
Slough
Santa Clara River
16D04

0.6 19A01

0.6 20M03

0.638
26M03

0.5 28G03

0.665
29D02

1.93 19J03

0.6 22Q05

0.9 23B04

0.429 23B05

0.535
23B06

0.603
06J05

0.3 20M01

0.557
26K03

0.5 28G02

0.371
29D01

0.372
35E02

0.333 35E03

0.453
01H02

0.753
07L03

0.655 07L04

0.566
32E01

0.4 23B03

0.644
?23
232 ?
126 ?
?34
?1
118 ?
32Q02

0.606 32Q03

2.16 28G01

0.335
35E01

0.475
£¤101
04D04

0.6 06L05

0.4 07J02

0.4 08R01

0.4 16M03

0.6 16P04

0.5 17B02

0.5 19J05

0.6 20K03

0.5 21H02

0.5 21H03

0.4 22C01

0.5 28D01

0.5 28M01

0.5 29B06

0.499
01M03

0.5 12N03

0.5 13D03

0.5 21B03

0.6 23R02

0.6 24B04

0.6 25K02

0.6 26D05

0.5 26P02

0.4 27H02

0.5 36B01

0.581
36B02

0.5 36H01

0.6 01H01

1.63 19A03

0.7 19G03

0.6 20M06

0.6 20Q05

0.6 13N04

0.6 20K01

0.8 20L03

0.66 24P02

0.7 30F03

0.6 T02N
T01S
T01N
R23W R22W R21W R20W R19W
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi es
CanyonRd
Balcom Canyon Rd
BradleyRd
Price Rd
Aggen Rd
Mountcl ef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR, FCGMA, VCWPD, CMWD, UWCD
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\2.3.4 water quality\Figure 2-X. Oxnard WQ mapping2.mxd 02 1 n Miles
FIGURE 2-46
Lower Aquifer System - Most Recent Boron (mg/L) Measured 2011-2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Oxnard Forebay
Boron concentration (mg/L), 2011-2015
!( 0 - 0.2
!( >0.2 - 0.5
!( >0.5 - 1.0
!( >1.0 - 2.0
!( >2.0 - 6.0
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
Notes:
1) Well labels consist of an italicized abbreviated State Well Number (SWN) and a concentration value beneath it.The concentration is the most recent concentration measured in water quality samples collected at that well in the five years from 2011-2015. For a complete water quality record for each well, see Appendix X. 2) "ND" signifies non-detect.
3) SWNs are based on Township and Range in the Public Land Survey System. To construct a full SWN from the abbreviation shown on the map,concatenate the Township, Range, abbreviation, and the letter "S". Example: the SWN for the well labeled "15L01" located in Township 02N (T02N) and Range 22W (R22W) is 02N22W15L01S. 4) The shape of each well symbol correspondsto the aquifer(s) in which it is screened (see above).
5) The color of each well symbol corresponds to the most recent concentration measured in a water quality sample from that well. 6) All concentrations are in mg/L.
7) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend

10.5 15P01 Abbreviated State Well Number (see notes)
Concentration (mg/L)
1080
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-212

INTENTIONALLY LEFT BLANK
1081
Ventura County
Los Angeles County
Bardsdale
Big Mountain
Larga Chaffee
Canyon
Conejo
(Abd.)
El Rio
Las
Posas
Las
Posas
Long
Canyon
(Abd.)
Moorpark
(Abd.)
Moorpark
West
Oak
Park
Oakridge
Oakview
(Abd.)
Oxnard
Santa
Clara
Avenue
Santa
Clara
Avenue
Saticoy
Saticoy
Shiells
Canyon
Simi
Somis
(Abd.)
South
Mountain
Torrey
Canyon
Montalvo, W.

West
Mountain
Ventura n
elito
Ocean
Ocean
Ocean
150 ?
232 ?
?33
?23
?34
?1
126 ?
118 ?
£¤101
Pacific Ocean
Bard Lake
Ventura
Oxnard
Port
Hueneme
Camarillo
Moorpark
Thousand Oaks
Simi Valley
Agoura Hills
Westlake
Village
Arroyo Simi
Arroyo Las Posas
ArroyoSanta Rosa
Calleguas Creek
ConejoCre e k
Ventura River
Arroyo Conejo
RevolonSlough
Santa Clara River
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
5th
St
Central Ave
Oxnard
Blvd
5th
St
Lewis Rd
Ventura Rd
5th St 5th
St
Hueneme
St
Ventura Rd
Oxnard
Ave
Oxnard
B vl d
Balcom
Canyon Rd
Bradley
St
Gr mi es Canyon Rd
Bradley Rd
Gr mi es
CanyonRd
Price Rd
Aggen Rd
Mountclef
Ridge
Sim i Hills
Camarillo Hills
Las Pos as Hills
Oak R idge
Santa Monica Mountains
Conejo
Mountain
Bi g
Mou nta in
S ou th M o u nt a in
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\ALL_BASINS\Figure X - Map of Oil and Gas Deposits.mxd 02 1 n Miles
Fox Canyon Groundwater Management Agency Boundary
(FCGMA 2016)
Major Rivers/Stream Channels
Oil Fields (Ventura County)
Revised Bulletin 118 Groundwater Basins and Subbasin
(DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
FIGURE 2-47
Oil Fields in the Vicinity of FCGMA Groundwater Basins
1082
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-214

INTENTIONALLY LEFT BLANK
1083
Ventura County
Los Angeles County
Arroyo Santa Rosa
Santa Clara River
Pacific Ocean
on
Drain
Drain
A
R
Brown Barranca
Drain
Lindero
Canyon
Medea
C reek
PaloComadoCanyon
Tapo Can
CalleguasCre ek
Beardsley Wash
Ventura
River

LAS VIR
North Fork Arroyo Conejo
South
Branch Arroyo Conejo
Arroyo Simi
Revolon Slough
Canada Lar ga
Wheeler Canyon
Arroyo Las Posas
Conejo Creek
Drain
Drain
Fox
Barranca
A
Arroyo Conejo
150 ?
232 ?
?33 ?23
?34
?1
126 ?
118 ?
£¤101
Pacific Ocean
Bard Lake
Ventura
Oxnard
Port
Hueneme
Camarillo
Moorpark
Thousand Oaks
Simi Valley
Agoura Hills
Westlake
Village
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
5th
St
Central Ave
Oxnard
Blvd
5th
St
Lewis Rd
Ventura Rd
5th St 5th
St
Hueneme
St
Ventura Rd
Oxnard
Ave
Oxnard
B vl d
Balcom
Canyon Rd
Bradley
St
Grimes Canyon Rd
Bradley Rd
Grimes
Canyon Rd
Price Rd
Aggen Rd
Mountclef
Ridge
S imi
Hil ls
Camarillo Hills
Las Pos as Hills
Oak R idge
Santa Monica Mountains
Conejo
Mountain
Bi g
Mou nta in
So u t h M oun t a in
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County
Date: 3/13/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\ALL_BASINS\Figure X - Map of 303d Surface Waters.mxd 02 1 n Miles
Major Rivers/Stream Channels
Impaired Surface Waters - 303(d) Listed Reaches
Revised Bulletin 118 Groundwater Basins and Subbasin
(DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
FIGURE 2-48
Impaired Surface Waters in the Vicinity of FCGMA Groundwater Basins 1084
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-216

INTENTIONALLY LEFT BLANK
1085
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J J
J
J
J
J J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J J
J
J
J J
J
J
J
J

J J J J
J J
J
J
J
J
J
J
J
J
J
J
J
J J
J
J
J
J
J
J
J
J
J
J J
J
J
J
J J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J J
J
J
J
!
Point Mugu
Naval Air
Station
!
Naval Construction
Battalion Center
Port Hueneme
Pacific Ocean
232 ?
126 ?
?1
?34
118 ?
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Arroyo LasPosas
A rroyo
ArroyoSanta Rosa
Calleguas Creek
Arroyo Simi
Santa Clara River
Conejo Creek
Revolon Slough
1 2
3 4
5 6
7 8
9 10
11 12 13
14 15
16 17
18 19
20 21
22 23
24 25
26 27
28 29
30 31
32 33
34 35
36 37
38 39
40 41
42 43
44 45
46 47 49
50 51
52 53
54 55
56 57
58 59
60 61
62 63
64 65
67 66
68 69
70 71 72
73 74
75 76
77 Pleasant Valley Rd
Oxnard
Blvd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Oxnard Blvd
Lewis Rd
Ventura Rd
5th St 5th
St
Ventura Rd
Oxnard
Ave
Oxnard
Blvd
Balcom
Canyon Rd
Price Rd
Aggen Rd
Bradley Rd
Mountclef
Ridge
Camar illo Hills
Las Posa s Hills
Santa Monica Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; Geotracker
Date: 3/14/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\ALL_BASINS\Figure X - Map of Geotracker Sites.mxd 02 1 n Miles
FIGURE 2-49
Constituents of Concern at Open Geo7racker Cases with Impacted Groundwater within FCGMA Groundwater Basin Boundaries MTBE and TBA
Pesticides
BTEX
J PCBs
J Metals
J
Gasoline and Diesel
J Chlorinated VOCs
Other COCs
Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Major Rivers/Stream Channels
Federal Lands
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Constituents of Concern identified in
groundwater at open GeoTracker cases
as of May 2017
77 Number labels correspond to the "Map ID"
column in $SSHQGL[-. Additional
information for each site can be found in
$SSHQGL[-.
1086
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-218

INTENTIONALLY LEFT BLANK
1087
^_ ^_^_ ^_ ^_ ^_ ^_ ^_ ^_ ^_ ^_^_ ^_ ^_^_ ^_ ^_ ^_ ^_ ^_ ^_
^_
^_
^_
^_
^_
^_
^_
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port
Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Cone jo
Santa ClaraRiv er
02H05
NM
29D03
NM
29F06
NM
29L03
NM
19L14

11.23 20M06

1.27 26J05

1.5 27C04

4.13 T02N
T01N
T01S
R20W
R23W
R22W R21W
NM

NM NM NM
NM NM
NM
NM

16.96 0.74

2.05 1.15

26.9 5.42 5.72

3.65 17.58

36.32 (96.27)
(82.63)
30 20
10 Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Gr mi esCanyon
Balcom Canyon Rd
Rd
BradleyRd
Price
Aggen Rd
Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount cl e f
Ridg e
Camar illo Hills
Las Posa s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 4/21/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-50
Groundwater Elevation Contours in the Semi-Perched Aquifer, March 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
^_ Semi-perched monitoring wells
^_ Shallow Wells from Geotracker (UWCD 2017)
1088
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-220

INTENTIONALLY LEFT BLANK
1089
^_ ^_^_ ^_ ^_ ^_ ^_ ^_ ^_ ^_ ^_^_ ^_ ^_^_ ^_ ^_ ^_ ^_ ^_ _
_ _
_
_
_
_
_
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Cone jo
Santa ClaraRiv er
02H05
NM
29D03
NM
29F06
NM
19L14

10.1 20M06

1.79 26J05

0.57 27C04

3.54 T02N
T01N
T01S
R20W
R23W
R22W R21W
NM
NM
(95.28)
(81.55)

14.73 -0.01

0.87 18.42

1.39 33.49 34.41

29.71 27.22

27.14 26.33

5.43 5.95

3.95 16.9
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
20 10
30 Gr mi esCanyon
Balcom Canyon Rd
Rd
BradleyRd
Price
Aggen Rd
Rd
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount cl e f
Ridg e
Camar illo Hills
Las Posa s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Date: 4/21/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\AquiferDesignations_WLEs\Wells with Aquifer Designations_2017.06.27.mxd 02 1 n Miles
FIGURE 2-51
Groundwater Elevation Contours in the Semi-Perched Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (Ventura County 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an italicized abbreviated
State Well Number (SWN) and a groundwater
elevation beneath it. SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) "NM" indicates no water level measurement was
collected within the specified time window.
3) Groundwater elevations not used to create
contours are shown in parentheses.
4) All elevation values are in feet above mean sea
level (ft AMSL).
5) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation
(feet amsl) of groundwater. Dashed where
approximate; queried where inferred.

Legend
-14.7
15P01 Abbreviated State Well Number (see notes)
Groundwater elevation feet AMSL
_ Semi-perched monitoring wells
^_ Shallow Wells from Geotracker (UWCD 2017)
1090
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-222

INTENTIONALLY LEFT BLANK
1091
Camarillo Hills
Santa Monica
Mountains
P a c i f i c O c e a n
Ventura
Oxnard
Port Hueneme
Camarillo
Calleguas Cree
R
k
evolon Slough
Santa Clara River
ÄÆ232
ÄÆ126
ÄÆ118
ÄÆ34
ÄÆ1
£¤101
Lower
Santa Clara
River
McGrath
Ormond Beach
Mugu
Revolon
Slough
Lower
Calleguas
Creek
Groundwater-Dependent Ecosystems for the Oxnard Subbasin Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Santa Barbara County; FCGMA
Date: 11/11/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Figure 2-52_Nov2019.mxd GDE Areas
Natural Communities Commonly Associated with
Groundwater - Wetlands; UWCD 2019
Natural Communities Commonly Associated with
Groundwater - Wetlands; TNC 2017
Fox Canyon Groundwater Management Agency
Boundary (FCGMA 2016)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
0 1 2 3
n Miles
FIGURE 2-52
1092
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-224

INTENTIONALLY LEFT BLANK
1093
Ventura Rd
Central
Ventura
Santa Clara River
ÄÆ1
ÄÆ118
ÄÆ232
ÄÆ126
£¤101
Lower Santa
Clara River
McGrath
FIGURE 2-53
Lower Santa Clara River Groundwater-Dependent Ecosystems Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Santa Barbara County; FCGMA; Esri
Date: 11/11/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Figure 2-53_Nov2019.mxd £¤101
ÄÆ34
ÄÆ1
ÄÆ118
ÄÆ126
ÄÆ232
0 0.5 1 n Miles
evA
Natural Communities Commonly
Associated with Groundwater -
Wetlands; UWCD 2018
Natural Communities Commonly
Associated with Groundwater -
Wetlands; TNC 2017
GDE Areas
Fox Canyon Groundwater
Management Agency Boundary
(FCGMA 2016)
Oxnard (4-004.02)
Major Rivers/Stream Channels
Extent of
Main Frame
1094
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-226

INTENTIONALLY LEFT BLANK
1095
McGrath GDE
5th St
Santa Clara River
FIGURE 2-54
McGrath Lake Groundwater Dependent Ecosystems
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Santa Barbara County; FCGMA; Esri
Date: 4/10/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Figure 2-54_Apr2019.mxd £¤101
?34
?1
118 ?
126 ?
232 ?
0 1,000 2,000 n Feet
Fox Canyon Groundwater
Management Agency Boundary
(FCGMA 2016)
Oxnard (4-004.02)
Natural Communities Commonly
Associated with Groundwater -
Wetlands
Natural Communities Commonly
Associated with Groundwater -
Vegetation
GDE Areas
Major Rivers/Stream Channels
Extent of
Main Frame
1096
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-228

INTENTIONALLY LEFT BLANK
1097
Ormond Beach GDE
Hueneme Rd
FIGURE 2-55
Ormond Beach Groundwater Dependent Ecosystems
Groundwater Sustainability Plan for the Oxnard SubbasinSOURCE: DWR; Santa Barbara County; FCGMA; Esri Date: 4/10/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Figure 2-55_Mar2019.mxd £¤101
?34
?1
118
?
126
?
232
?
0 1,000 2,000
n Feet
Fox Canyon GroundwaterManagement Agency Boundary(FCGMA 2016)Oxnard (4-004.02)Natural Communities CommonlyAssociated with Groundwater -WetlandsNatural Communities CommonlyAssociated with Groundwater -VegetationGDE AreasMajor Rivers/Stream Channels Extent ofMain Frame
1098
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-230

INTENTIONALLY LEFT BLANK
1099
nd Beach
Mugu GDE
?1
Callegua s
Creek
Revolon Slough
FIGURE 2-56
Mugu Lagoon Groundwater Dependent Ecosystems
Groundwater Sustainability Plan for the Oxnard SubbasinSOURCE: DWR; Santa Barbara County; FCGMA; Esri File String
£¤101
?1
?34
118 ?
126 ?
232 ?
01 0.5 n Miles
Fox Canyon GroundwaterManagement Agency Boundary(FCGMA 2016)Oxnard (4-004.02)Natural Communities CommonlyAssociated with Groundwater -WetlandsNatural Communities CommonlyAssociated with Groundwater -VegetationGDE AreasMajor Rivers/Stream Channels Extent ofMain Frame
1100
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-232

INTENTIONALLY LEFT BLANK
1101
?33
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo Mountclef
Ridge
Cama r illo Hills
Las Pos as Hills
Santa Monica Mountains
Conejo
Mountain
*URXQGZDWHU6XVWDLQDELOLW\3ODQIRUWKH2[QDUG6XEEDVLQ SOURCE: DWR, USGS, NRCS
Date: 1/8/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Recharge\Oxnard Recharge map.mxd 02 1 n Miles
Legend
Major Rivers/Stream Channels
CA Cities
Fox Canyon Groundwater Management Agency
Jurisdiction (FCGMA 2016)
Revised Bulletin 118 Groundwater Basins
and Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Surface Texture w/ Ksat ≥ 92 μm/s
Extremely gravelly coarse sand, 92
Fine sand, 92
Loamy Sand, 92
Loamy fine sand, 92
Loamy sand, 92
Sand, 92
FIGURE 2-57
2[QDUG3RWHQWLDO5HFKDUJH$UHDV
1102
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-234

INTENTIONALLY LEFT BLANK
1103
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")
")")
")
")
")
^_
^_
^_
^_
^_
^_
^_
Pacific Ocean
232 ?
126 ?
?23
?34
?1
118 ?
£¤101
Bard
Lake
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
632
730 700
731A
732
733
734
734A
777
778
779
781
806A
830
835
836
838
839
931
931A
708
708A
719
723
724
776
776A
780 782
800
800A
801
805
806
808
810
811
841
841A
Freeman
Diversion
Conejo Creek
Diversion
Camarillo Sanitary
District Water
Reclamation Plant
Camrosa Water
Reclamation
Plant
Hill Canyon
Wastewater
Treatment Plant
Montalvo
Wastewater
Treatment Plant
Saticoy
Wastewater
Treatment Plant
REVOLO
N

CHANNEL

ARROYO LAS POSAS

CONEJO CR EEK

CALLEGUAS CREEK
Pleasant Valley Rd
Oxnard
Blvd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Oxnard Blvd
Lewis Rd
Ventura Rd
5th St 5th
St
Ventura Rd
Oxnard
Ave
Balcom Canyon Rd
Grimes Canyon
Rd
Brad el yRd
Price Rd
Aggen Rd
Mountclef
Ridge
Camar ill o Hills
Las Po sa s Hills
Santa Monica Mountains
Conejo
Mountain
FIGURE 2-58
Oxnard Subbasin Stream Gauges and Water Infrastructure
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; VCWPD
Date: 4/9/2019 - Last saved by: ntucker - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Sec2.4 Water Budget Figure with UWCD pipelines.mxd Ventura County Rivers, Streams and Channels
(VCWPD 2016)
Fox Canyon Groundwater Management Agency
Boundary (FCGMA 2016)
Revised Bulletin 118 Groundwater Basins and
Subbasin (DWR 2016)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard Plain (4-004.02)
Ventura County Stream Gage Locations (VCWPD
2016; labeled by station number)
") Inactive
") Active
Water Infrastructure
^_ Diversion Structures
^_ Water Reclamation Plants
^_ Wastewater Treatment Plant
UWCD Recharge Basins
Oxnard recycled water (Redwood line)
UWCD Pipelines
Oxnard-Hueneme Drinking Water
Pumping Trough Pipeline Surface Water
Pleasant Valley Pipeline
PVCWD Pipeline
03 1.5 n Miles
1104
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-236

INTENTIONALLY LEFT BLANK
1105
Groundwater Sustainability Plan for the Oxnard Subbasin Freeman Diversion and Uses in the Oxnard Subbasin
FIGURE 2-59
0 20,000
40,000
60,000
80,000
100,000120,000140,000160,000
1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 AF
Year
Freeman Diversion Recharge in Oxnard Forebay Spreading GroundsPTP Supply Line Deliveries (To Oxnard Subbasin Only) PVP Supply Line Deliveries to Oxnard Subbasin and Pleasant Valley Basin1 1106
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-238

INTENTIONALLY LEFT BLANK
1107
Groundwater Sustainability Plan for the Oxnard Subbasin FIGURE 2-60
UWCD Groundwater Recharge
0 20,00040,00060,00080,000
100,000120,000140,000
1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 AF
Year
Recharge to
SaƟcoy
Recharge to
Noble
Recharge toEl Rio
Total Recharge
1108
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-240

INTENTIONALLY LEFT BLANK
1109
Groundwater Sustainability Plan for the Oxnard Subbasin Water Deliveries to the PVCWD and UWCD
FIGURE 2-61
0 2,0004,0006,0008,000
10,000
12,000
14,000
16,000
18,000
20,000
1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 AF
Year
Delivered and Used by the City of Oxnard for M&I Delivered and Used by Port Hueneme Water Agency for M&I Total Imported Water Supplied 1110
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-242

INTENTIONALLY LEFT BLANK
1111
Groundwater Sustainability Plan for the Oxnard Subbasin Groundwater Pumping
FIGURE 2-62
0 20,000
40,000
60,000
80,000
100,000120,000
1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 AF
Year
Total Agricultural Total M&I Total DomesƟc Total Pumpage 1112
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-244

INTENTIONALLY LEFT BLANK
1113
FIGURE 
Coastal Flux From the UWCD Model Scenarios
*URXQGZDWHU6XVWDLQDELOLW\3ODQIRUWKH2[QDUG6XEEDVLQ Path: Z:\Projects\
1114
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-246

INTENTIONALLY LEFT BLANK
1115
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"J
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!( "J "J
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Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal legu as Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Oxnard SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-64a
UWCD Model Particle Tracks, Oxnard Aquifer, )XWXUH%DVHOLQH Legend
Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 44 AF total
!( >2 - 10; 149 AF total
!( >10 - 100; 3,867 AF total
!( >100 - 1000; 27,400 AF total
!( >1000; 11,766 AF total
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Well screened in multiple aquifers in the UAS
< Well screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1116
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-248

INTENTIONALLY LEFT BLANK
1117
!<
GF "J
"J
"J GF "J
"J
"J !< !<
!( "J "J
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?1
Pacific Ocean
Bailey Fault
Lewis Rd
Ventura Rd
Pleasant Valley Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Santa Monica
Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Climate Period 1930-1979; Climate Change Factor 2070
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Mugu SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-64b
UWCD Model Particle Tracks, Mugu Aquifer, )XWXUH%DVHOLQH Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 44 AF total
!( >2 - 10; 149 AF total
!( >10 - 100; 3,867 AF
!( >100 - 1000; 27,400 AF
!( >1000; 11,766 AF
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Well screened in multiple aquifers in the UAS
< Well screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1118
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-250

INTENTIONALLY LEFT BLANK
1119
!H
!H
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!H !H !H !H
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?1
Pacific Ocean
Port Hueneme
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Climate Period 1930-1979; Climate Change Factor 2070
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Hueneme SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-64c
UWCD Model Particle Tracks, Hueneme Aquifer, )XWXUH%DVHOLQH Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF total
!( >2 - 10; 85.5 AF total
!( >10 - 100; 1,706 AF total
!( >100 - 1000; 38,516 AF total
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1120
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-252

INTENTIONALLY LEFT BLANK
1121
!H !H
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Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Upper Fox SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-64d
UWCD Model Particle Tracks, Upper Fox Canyon Aquifer, )XWXUH%DVHOLQH Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF
!( >2 - 10; 85.5 AF
!( >10 - 100; 1,706 AF
!( >100 - 1000; 38,516 AF
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1122
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-254

INTENTIONALLY LEFT BLANK
1123
!H !H
!H
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Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Basal Fox SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-64e
UWCD Model Particle Tracks, Basal Fox Canyon Aquifer, )XWXUH%DVHOLQH Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF
!( >2 - 10; 85.5 AF
!( >10 - 100; 1,706 AF
!( >100 - 1000; 38,516 AF
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1124
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-256

INTENTIONALLY LEFT BLANK
1125
Ventura River
Santa
Monica
Mountains
ÖÕ118
ÖÕ33
Revolon Slough
Camarillo Hills
ÖÕ126
ÖÕ1
£[101
£[101
South Mountain
Santa Clara River
Mugu Lagoon
Channel
Islands
Harbor
Port
Hueneme
Ormond Beach
Wetlands
McGrath
Lake
Ventura
Harbor
Pacific Ocean
Ventura
Oxnard
Camarillo
Fifth St
Victoria Ave Pleasant Valley Rd
Hueneme Rd
dR dooW
evA eciR
Vineyard Ave
Central Ave
Laguna Rd Channel Islands Blvd
237
124
240
Calleguas Creek
Arroyo Las Posas
125
126
149
147148
151 139
145
152
142 146 143 130 144141 136 150 140
129138
128135
137 127
134 133 131 132
Conejo Creek
12 125 122
240
126
149
147148
151 139
145
152
142 146 143 130 144141 136 150 140
129138
128135
137 127
134 133 131 132
UV
Beardsley Wash
2 3
4 5
6 7
8 9
11 18
16 15
29 13
12 19
10 20
22 23
24 25
27 28
14 Legend
Active Model Grid, 2018
Version of VRGWFM
DWR Bulletin 118
Groundwater BasinBoundaries (2016)
Additional Locally-Defined
Groundwater Sub-basins
Limit of Active Grid Cells in
Model Layer 9
Zones Used forSensitivity Analysis:
2345678910111213141516181920222324252728
012345 ½ 29
μ
Miles
Saticoy
Spreading
Grounds
El Rio
Spreading
Grounds
FIGURE 
UWCD Model Zones
*URXQGZDWHU6XVWDLQDELOLW\3ODQIRUWKH2[QDUG6XEEDVLQ SOURCE: Figure 4-53; UWCD, 2018
Path: Z:\Projects\_____\_____
1126
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-258

INTENTIONALLY LEFT BLANK
1127
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Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal legu as Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Oxnard SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-66a
UWCD Model Particle Tracks, Oxnard Aquifer, )XWXUH%DVHOLQHWith Projects Legend
Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 44 AF total
!( >2 - 10; 149 AF total
!( >10 - 100; 3,867 AF total
!( >100 - 1000; 27,400 AF total
!( >1000; 11,766 AF total
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Well screened in multiple aquifers in the UAS
< Well screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1128
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-260

INTENTIONALLY LEFT BLANK
1129
!<
GF "J
"J
"J GF "J
"J
"J !< !<
!( "J "J
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Pacific Ocean
Bailey Fault
Lewis Rd
Ventura Rd
Pleasant Valley Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Santa Monica
Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Climate Period 1930-1979; Climate Change Factor 2070
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Mugu SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-66b
UWCD Model Particle Tracks, Mugu Aquifer, )XWXUH%DVHOLQHWith Projects Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 44 AF total
!( >2 - 10; 149 AF total
!( >10 - 100; 3,867 AF
!( >100 - 1000; 27,400 AF
!( >1000; 11,766 AF
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Well screened in multiple aquifers in the UAS
< Well screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1130
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-262

INTENTIONALLY LEFT BLANK
1131
!H
!H
!H
!H
!H
!H
!H
!H !H !H !H
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*#
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?1
Pacific Ocean
Port Hueneme
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Climate Period 1930-1979; Climate Change Factor 2070
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Hueneme SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-66c
UWCD Model Particle Tracks, Hueneme Aquifer, )XWXUH%DVHOLQH:LWK3URMHFWV Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF total
!( >2 - 10; 85.5 AF total
!( >10 - 100; 1,706 AF total
!( >100 - 1000; 38,516 AF total
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1132
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-264

INTENTIONALLY LEFT BLANK
1133
!H !H
!H
!H
!H
!H
!<
!H !H
!H
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GF!H
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GF
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Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Upper Fox SWI Particle Tracks.mxd 02 1 n Miles
FIGURE 2-66d
UWCD Model Particle Tracks, Upper Fox Canyon Aquifer, )XWXUH%DVHOLQH with Projects Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF
!( >2 - 10; 85.5 AF
!( >10 - 100; 1,706 AF
!( >100 - 1000; 38,516 AF
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1134
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-266

INTENTIONALLY LEFT BLANK
1135
!H !H
!H
!H
!H
!H
!<
!H !H
!H
!H
GF!H
!H!H
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$+
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!H
GF
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*#
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?1
Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Basal Fox SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-66e
UWCD Model Particle Tracks, Basal Fox Canyon Aquifer, )XWXUH%DVHOLQH with Projects Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF
!( >2 - 10; 85.5 AF
!( >10 - 100; 1,706 AF
!( >100 - 1000; 38,516 AF
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1136
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-268

INTENTIONALLY LEFT BLANK
1137
!<
GF "J
"J
"J GF "J
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Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal legu as Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Oxnard SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-67a
UWCD Model Particle Tracks, Oxnard Aquifer, 5HGXFWLRQZLWKProjects Simulation - 2,00 AFY Groundwater Production in the UAS Legend
Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 44 AF total
!( >2 - 10; 149 AF total
!( >10 - 100; 3,867 AF total
!( >100 - 1000; 27,400 AF total
!( >1000; 11,766 AF total
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Well screened in multiple aquifers in the UAS
< Well screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1138
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-270

INTENTIONALLY LEFT BLANK
1139
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GF "J
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?1
Pacific Ocean
Bailey Fault
Lewis Rd
Ventura Rd
Pleasant Valley Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Santa Monica
Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Climate Period 1930-1979; Climate Change Factor 2070
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Mugu SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-67b
UWCD Model Particle Tracks, Mugu Aquifer, 5HGXFWLRQZLWK3URMHFWV6LPXODWLRQ$)<*URXQGZDWHU3URGXFWLRQLQWKH8$6 Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 44 AF total
!( >2 - 10; 149 AF total
!( >10 - 100; 3,867 AF
!( >100 - 1000; 27,400 AF
!( >1000; 11,766 AF
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Well screened in multiple aquifers in the UAS
< Well screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1140
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-272

INTENTIONALLY LEFT BLANK
1141
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Pacific Ocean
Port Hueneme
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Climate Period 1930-1979; Climate Change Factor 2070
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Hueneme SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-67c
UWCD Model Particle Tracks, Hueneme Aquifer, 5HGXFWLRQZLWK3URMHFWV6LPXODWLRQ$)<*URXQGZDWHU3URGXFWLRQLQWKH/$6 Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF total
!( >2 - 10; 85.5 AF total
!( >10 - 100; 1,706 AF total
!( >100 - 1000; 38,516 AF total
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1142
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-274

INTENTIONALLY LEFT BLANK
1143
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Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Upper Fox SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-67d
UWCD Model Particle Tracks, Upper Fox Canyon Aquifer, 5HGXFWLRQZLWK3URMHFWV6LPXODWLRQ$)<*URXQGZDWHU3URGXFWLRQLQWKH/$6 Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF
!( >2 - 10; 85.5 AF
!( >10 - 100; 1,706 AF
!( >100 - 1000; 38,516 AF
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1144
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-276

INTENTIONALLY LEFT BLANK
1145
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Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Basal Fox SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-67e
UWCD Model Particle Tracks, Basal Fox Canyon Aquifer, 5HGXFWLRQZLWK3URMHFWV6LPXODWLRQ$)<*URXQGZDWHU3URGXFWLRQLQWKH/$6 Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF
!( >2 - 10; 85.5 AF
!( >10 - 100; 1,706 AF
!( >100 - 1000; 38,516 AF
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1146
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-278

INTENTIONALLY LEFT BLANK
1147
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Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal legu as Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Oxnard SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-68a
UWCD Model Particle Tracks, Oxnard Aquifer, 5HGXFWLRQ:LWKRXW3URMHFWVSimulation - 27,00 AFY Groundwater Production in the UAS Legend
Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 44 AF total
!( >2 - 10; 149 AF total
!( >10 - 100; 3,867 AF total
!( >100 - 1000; 27,400 AF total
!( >1000; 11,766 AF total
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Well screened in multiple aquifers in the UAS
< Well screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1148
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-280

INTENTIONALLY LEFT BLANK
1149
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Pacific Ocean
Bailey Fault
Lewis Rd
Ventura Rd
Pleasant Valley Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Santa Monica
Mountains
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Climate Period 1930-1979; Climate Change Factor 2070
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Mugu SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-68b
UWCD Model Particle Tracks, Mugu Aquifer, 5HGXFWLRQ:LWKRXW Projects Simulation - 27,00 AFY Groundwater Production in the UAS Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 44 AF total
!( >2 - 10; 149 AF total
!( >10 - 100; 3,867 AF
!( >100 - 1000; 27,400 AF
!( >1000; 11,766 AF
Aquifer designation
) Well screened in the Oxnard aquifer
W Well screened in the Mugu aquifer
J Well screened in multiple aquifers in the UAS
< Well screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1150
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-282

INTENTIONALLY LEFT BLANK
1151
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Port Hueneme
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
Climate Period 1930-1979; Climate Change Factor 2070
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Hueneme SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-68c
UWCD Model Particle Tracks, Hueneme Aquifer, 5HGXFWLRQ:LWKRXW3URMHFWVSimulation - 1,00 AFY Groundwater Production in the LAS Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF total
!( >2 - 10; 85.5 AF total
!( >10 - 100; 1,706 AF total
!( >100 - 1000; 38,516 AF total
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1152
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-284

INTENTIONALLY LEFT BLANK
1153
!H !H
!H
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Pacific Ocean
Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Upper Fox SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-68d
UWCD Model Particle Tracks, Upper Fox Canyon Aquifer, 5HGXFWLRQ:LWKRXW3URMHFWVSimulation - 1,00 AFY Groundwater Production in the /AS Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF
!( >2 - 10; 85.5 AF
!( >10 - 100; 1,706 AF
!( >100 - 1000; 38,516 AF
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1154
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-286

INTENTIONALLY LEFT BLANK
1155
!H !H
!H
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Port Hueneme
Santa Monica
Mountains
Bailey Fault
Ventura Rd
Pleasant Valley Rd
Lewis Rd
Hueneme Rd
Revol on Slough
Cal leguas Creek
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; Ventura County; UWCD; CMWD
1930-1979 Climate Period; 2070 Climate Change Factor
Date: 4/18/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\WORKING\Basal Fox SWI Particle Tracks.mxd 02 1 n Miles
Figure 2-68e
UWCD Model Particle Tracks, Basal Fox Canyon Aquifer, 5HGXFWLRQ:LWKRXW3URMHFWVSimulation - 1,00 AFY Groundwater Production in the LAS Notes:
1) The shape of each well symbol corresponds
to the aquifer(s) in which it is screened (see above).
2) The color of each well symbol corresponds to
to the pumping in the well for calendar year 2015
3) Aquifer designation information for individual
wells was provided by FCGMA, CMWD and UWCD.

Fox Canyon Groundwater Management
Agency Jurisdiction (FCGMA 2016)
Pleasant Valley (4-06)
Oxnard Plain (4-04.02)
2015 Extraction (acre-feet)
!( 0 - 2; 19.4 AF
!( >2 - 10; 85.5 AF
!( >10 - 100; 1,706 AF
!( >100 - 1000; 38,516 AF
!( >1000; 26,141 total
Aquifer designation
* Well screened in the Hueneme aquifer
( Well screened in the Fox Canyon aquifer
+ Well screened in the Grimes Canyon aquifer
H Wells screened in multiple aquifers in the LAS
< Wells screened in both the UAS and LAS
F Well screened in unknown aquifer(s)
Fall 2015 Extent of Seawater Intrusion
Legend
UWCD Model Particle Tracks
(Green 2020-2039; Red 2040-2069)
1156
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-288

INTENTIONALLY LEFT BLANK
1157
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
232 ?
126 ?
118 ?
?34
?1
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Calleguas Creek
Santa Clara River
Revolon Slough
Santa Monica
West Oxnard Plain
Management Area
Forebay
Management
Area
East Oxnard
Plain
Management Area
Oxnard Pumping
Depression
Management Area
Saline Intrusion
Management Area
North
Pleasant Valley
Management Area
Pleasant Valley
Pumping Trough
Management Area
East Pleasant
Valley
Management Area
Camarill o Hills
Oxnard Subbasin Management Areas
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; FCGMA
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_2_FIGURES\Figure 2-69.mxd East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management$UHD
Oxnard Pumping Depression
Management Area
Saline Intrusion Management
East Pleasant Valley Management Area
(EPVMA)
Pleasant Valley Pumping Depression
Management Area
North Pleasant Valley Management
Fox Canyon Groundwater Management
Agency
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
0123 n Miles
FIGURE 2-69
1158
2 – BASIN SETTING
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 2-290

INTENTIONALLY LEFT BLANK
1159
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-1
CHAPTER 3

SUSTAINABLE MANAGEMENT CRITERIA

3.1 INTRODUCTION TO SUSTAINABLE MANAGEMENT CRITERIA
In the Oxnard Subbasin,significant and unreasonable seawater intrusion is the primary undesirable result that occurs when groundwater production exceeds the sustainable yield. This undesirable result can occur even if groundwater production from the Subbasin as a whole is less than the freshwater recharge to the Subbasin, as seawater intrusion is closely related to groundwater production from coastal wells. Infrastructure projects and management actions undertaken in the Oxnard Subbasin have at times limited and even reversed the progress of seawater intrusion (see Section 2.3.3, Seawater Intrusion). However, groundwater elevations declined in all aquifers in the Subbasin in response to the statewide drought that began in 2011. These groundwater elevation declines exacerbated the impacts of seawater intrusion in the Subbasin.

On October 28, 2015, after several consecutive years of drought, the Fox Canyon Groundwater Management Agency (FCGMA) Board of Directors (Board) adopted planning goals for the Oxnard Subbasin, as well as the other basins within its jurisdiction. These goals are as follows:
 Control saline water impact front at its current position.  Do not allow groundwater quality to further degrade without mitigation.  No net subsidence due to groundwater withdrawal.
 Promote water levels that mitigate or minimize undesirable results (including pumping trough depressions, surface water connectivity, and chronic lowering of water levels).

These goals guide the definition of undesirable results, minimum thresholds, and measurable objectives in the subsequent sections.

Groundwater elevations are the primary metrics by which progress toward meeting the sustainability goal in the Oxnard Subbasin will be measured. Sustainable management of the Oxnard Subbasin does not necessarily mean, however, that springtime high groundwater levels in the Subbasin remain the same year after year. Rather, sustainability can be achieved over cycles of drought and recovery, so long as the impacts to the Subbasin that may occur during periods of drawdown are not significant or unreasonable. Thus, year over year, groundwater levels may decline during a drought, but sustainable management will result in groundwater levels—and, by extension, chloride concentrations and land surface elevations—returning to pre-drought levels in the wet years after a drought.
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3.2 SUSTAINABILITY GOAL
The primary sustainability goal in the Oxnard Subbasin is to increase groundwater elevations inland of the Pacific coast in the aquifers that compose the Upper Aquifer System (UAS) and the Lower Aquifer System (LAS) to elevations that will prevent the long-term, or climatic cycle net (net), landward migration of the 2015 saline water impact front (see Section 3.3.3); prevent net seawater intrusion in the UAS; and prevent net seawater intrusion in the LAS.

The use of net landward migration, and net seawater intrusion in the sustainability goal reflects that climatic cycles influence groundwater elevations over multi-year periods and requires that assessment of seawater impacts to the Subbasin be tied to a time period over which net impacts are measured. This Groundwater Sustainability Plan (GSP) assesses net impacts to the Oxnard Subbasin over both a 50-year period beginning in 2020, and a 30-year period beginning in 2040.

Undesirable results may occur in the Subbasin between 2020 and 2039, as progress is made toward sustainable management. By 2040, however, management of the Subbasin should achieve the sustainability goal. The 30-year period from 2040 through 2069 is referred to as the sustaining period in this GSP, as it is the period on which the evaluation of sustainability is based.

In order to achieve the sustainability goal, groundwater production will need to be reduced relative to historical groundwater production rates. At the same time, groundwater production inland from the coast may be allowed to increase as infrastructure is developed to convey inland production to agricultural users on the coast. During the first 5 years following GSP adoption, it is anticipated that the combined groundwater production from both the UAS and the LAS will begin to be reduced toward the estimated sustainable yield, accounting for the uncertainty assessed in the model water budget and sustainable yield predictions (Section 2.4, Water Budget).

Proposed reductions in groundwater production must take into account the potential economic disruption to the agricultural industry in the Subbasin, the interference with municipal water supply planning and rate setting, and the uncertainty in the estimated sustainable yield of the Subbasin.

The estimated sustainable yield of the Subbasin is 42,000 acre-feet per year (AFY) with an uncertainty estimate of ±9,000 AFY (see Section 2.4.4, General Uncertainties in the Water Budget). The average 2015 groundwater production rate was 69,000 AFY. The difference between the upper estimate of the sustainable yield, 51,000 AFY, and the 2015 production rate is 18,000 AFY. If production is reduced linearly between 2020 and 2040, the estimated groundwater production reduction necessary throughout the geographic extent of the Oxnard Subbasin is approximately 900 AFY. However, the sustainability goal allows for operational flexibility, as groundwater production patterns are anticipated to change during the 20-year GSP implementation period from 2020 through 2039. Progress toward the sustainability goal will be evaluated throughout the 20-year implementation period.
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The following sections describe the undesirable results that have occurred and may occur within the Subbasin, the minimum thresholds developed to avoid undesirable results, and the measurable objectives that account for the need to continue groundwater production during drought cycles and the associated interim milestones to help gauge progress toward sustainability over the next 20 years.

3.3 UNDESIRABLE RESULTS
Under the Sustainable Groundwater Management Act (SGMA), undesirable results occur when the effects caused by groundwater conditions occurring throughout the Subbasin cause significant and unreasonable impacts to any of the six sustainability indicators. These sustainability indicators are as follows:
 Chronic lowering of groundwater levels
 Reduction of groundwater storage
 Seawater intrusion
 Degraded water quality
 Land subsidence
 Depletions of interconnected surface water
The definition of what constitutes a significant and unreasonable impact for each sustainability indicator is determined by the Groundwater Sustainability Agency, which is FCGMA in the Oxnard Subbasin, using the processes and criteria set forth in the GSP. Each of the sustainability indicators is discussed in this section in the context of undesirable results.

3.3.1 Chronic Lowering of Groundwater Levels
Chronic lowering of groundwater levels resulting in a significant and unreasonable depletion of supply is an undesirable result applicable to the Oxnard Subbasin. Seawater intrusion occurs in the Subbasin as groundwater levels fall below threshold elevations that maintain sufficient hydrostatic pressure to keep seawater from moving landward. The threshold groundwater elevations differ between the aquifers of the UAS and the LAS, as well as with geographic location in the Subbasin.

Groundwater elevation declines can also induce release of connate water brines, reduce the quantity of freshwater in storage, and cause land subsidence in the Subbasin.

The primary cause of groundwater conditions in the Subbasin that would lead to chronic lowering of groundwater levels is groundwater production in excess of natural and artificial recharge.

Groundwater production from the Subbasin may result in significant and unreasonable lowering of groundwater levels if the groundwater levels were lowered to an elevation at which they allow net seawater intrusion in the UAS and LAS over climate cycles of drought and recovery.

Historically, this condition has occurred within the Oxnard Subbasin. 1162
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In the past, groundwater levels in the UAS have declined during periods of drought and recovered during wet periods (Section 2.3.1, Groundwater Elevation Data). In fact, flowing artesian conditions were observed in UAS wells after multiple-year periods of above-average precipitation (UWCD 2016; Appendix C, UWCD Model Report, to this GSP). Groundwater levels in the LAS have also declined during drought and risen during wet periods, although the water levels in many wells in the LAS have remained below sea level since the 1980s (Section 2.3.1). One factor that contributed to the recovery of water levels following periods of drought was the amount of surface water that was diverted from the Santa Clara River and infiltrated through spreading basins to recharge the aquifers. Surface-water flows are available during wetter-than-average precipitation periods. These surface-water diversions and spreading are controlled by the United Water Conservation District (UWCD), which anticipates maintaining the historical volume of water diverted from the Santa Clara River over the next 50 years (UWCD 2018).

In addition to surface-water spreading, seawater intrusion into the aquifers of the Oxnard Subbasin has also sustained groundwater levels. Unlike surface-water spreading, seawater intrusion sustains groundwater levels at the expense of freshwater storage in the Subbasin (Section 2.3.3). Water levels in the aquifers of the LAS have remained below sea level even during drought recovery periods, thereby continuing to allow migration of seawater into the Subbasin near the Mugu and Hueneme Submarine Canyons (Section 2.3, Groundwater Conditions). Continued seawater intrusion has reduced the amount of freshwater in storage in the Subbasin.

Based on the sustainability goals for the Oxnard Subbasin, the criterion used to define undesirable results for chronic lowering of groundwater levels is landward migration of the 2015 saline water impact front during the sustaining period from 2040 through 2069. It is expected that there will be some landward migration of this front between 2020 and 2040 as the FCGMA Board and stakeholders in the Subbasin undertake the necessary projects and management actions toward achieving sustainability in 2040. The minimum thresholds metric against which chronic lowering of groundwater levels will be measured is groundwater levels that were selected to prevent net landward migration of the 2015 saline water impact front, and net seawater intrusion over the 30- year sustaining period from 2040 through 2069. These groundwater elevations are higher than previous historical low water levels, many of which were measured in the fall of 2015 (Table 3-1; Figures 3-1 through 3-5, Minimum Thresholds and Groundwater Elevation Contours).

In order to effectively manage the groundwater resources of the Oxnard Subbasin, the Subbasin has been divided into five management areas (see Section 2.5, Management Areas; Figure 2-69, Oxnard Subbasin Management Areas). These areas are defined by differences in their hydrogeologic properties, groundwater quality, or historical groundwater elevations. Groundwater elevations within each management area will be used to determine whether significant and unreasonable chronic lowering of groundwater levels is occurring. All of the management areas except the East Oxnard Plain Management Area (EOPMA) have wells in which water levels can be monitored by aquifer. 1163
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Until a monitoring well is installed in the EOPMA, the water level thresholds set for the wells closest to the EOPMA are presumed to be protective for the EOPMA, which has considerably less groundwater production than the adjoining management areas. This presumption will be revisited as groundwater elevation data are collected from the EOPMA.

Chronic lowering of groundwater levels in the Oxnard Subbasin has the potential to impact the beneficial uses and users of groundwater in the Subbasin by (1) exacerbating seawater intrusion in the Subbasin, (2) reducing the volume of freshwater in storage, (3) potentially causing land subsidence, (4) impacting areas of interconnected surface water and groundwater, and (5) causing groundwater levels to drop below current well screens.

3.3.2 Reduction of Groundwater Storage
Significant and unreasonable reduction of groundwater storage is an undesirable result that applies to the Oxnard Subbasin. Seawater intrusion occurs in the Subbasin as groundwater levels fall below threshold levels that maintain sufficient hydrostatic pressure to keep seawater from moving landward. The threshold groundwater levels differ between the UAS and the LAS, and differ with geographic location in the Subbasin.

The primary cause of groundwater conditions in the Subbasin that would lead to reduction in groundwater storage is groundwater production in excess of recharge over a cycle of drought and recovery. Groundwater production from the Subbasin may result in a significant and unreasonable reduction of groundwater in storage if the volume of water produced from the Subbasin exceeds the volume of freshwater recharging the Subbasin over cycles of drought and recovery. Changes in groundwater in storage can be tracked using groundwater elevations and would become significant and unreasonable if groundwater levels were lowered to an elevation below which they allow landward migration of the 2015 saline water impact front over cycles of drought and recovery, which would cause a long-term decline in groundwater storage.

Numerical groundwater model simulations indicate that there has been approximately 101,000 acre-feet (AF) of storage loss in the Oxnard Subbasin over the 31 years from 1985 to 2015 (Section

2.3.2, Estimated Change in Storage; Appendix C). The model results also indicate that between 1985 and 2015, approximately 380,000 AF of seawater intruded into the UAS and LAS under the Oxnard Subbasin. The replacement of freshwater with seawater is a reduction in freshwater storage and is an undesirable result that has already occurred within the Subbasin.

Based on the sustainability goals for the Oxnard Subbasin, the criterion used to define undesirable results for reduction in groundwater storage is landward migration of the 2015 saline water impact front after 2040. The minimum thresholds metric against which reduction of groundwater storage will be measured is water levels that were selected to prevent net landward migration of the 2015 saline water impact front, and net seawater intrusion after 2040. These groundwater elevations are higher than previous historical low water levels (Table 3-1). 1164
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Groundwater elevations within each management area of the Oxnard Subbasin will be used to determine whether significant and unreasonable reduction of groundwater in storage is occurring.

All of the management areas except the EOPMA have wells in which water levels can be monitored by aquifer. Until a monitoring well is installed in the EOPMA, the water level thresholds set for the wells closest to the EOPMA are presumed to be protective for the EOPMA, which has considerably less groundwater production than the adjoining management areas. This presumption will be revisited as groundwater elevation data are collected from the EOPMA.

Reduction of groundwater storage in the Oxnard Subbasin has the potential to impact the beneficial uses and users of groundwater in the Subbasin by limiting the volume of groundwater available for agricultural, municipal, industrial, domestic, and environmental. These impacts will affect all users of groundwater in the Subbasin.

3.3.3 Seawater Intrusion
Significant and unreasonable seawater intrusion is an undesirable result that is present or likely to occur in the Oxnard Subbasin. Seawater intrusion is the primary sustainability indicator in the Oxnard Subbasin. Seawater intrusion occurs in the Subbasin as groundwater levels fall below threshold levels that maintain sufficient hydrostatic pressure to keep seawater from moving landward. The threshold groundwater levels differ between the UAS and the LAS, and differ with geographic location in the Subbasin.

The primary cause of groundwater conditions in the Subbasin that would lead to seawater intrusion is groundwater production. Currently, the area of the Subbasin impacted by concentrations of chloride greater than 500 milligrams per liter (mg/L) is generally west of Highway 1 and south of Hueneme Road. Sources of water high in chloride in the Oxnard Subbasin include modern seawater as well as non-marine brines and connate water in fine-grained sediments (see Section

2.3.3). Therefore, this area is referred to as the “saline water impact area,” rather than the “seawater intrusion impact area,” to reflect all the potential sources of chloride to the aquifers in this area.

The saline water impact area was already impacted before 2015, when SGMA was implemented.

As a result, the goal of this GSP is not to reverse historical impacts, but rather to limit seawater intrusion to the area that has already been impacted. Therefore, significant and unreasonable seawater intrusion is defined as seawater intrusion that results in a net landward migration of the 2015 saline water impact front beyond the already impacted area west of Highway 1 and south of Hueneme Road from 2040 through 2069.

Chloride concentrations in the Oxnard Subbasin indicate that seawater intrusion has occurred historically, and is currently occurring, in the vicinity of Point Hueneme and Point Mugu.

However, seawater is not the only source of chloride to the groundwater of the Oxnard Subbasin (Section 2.3.3, Groundwater Conditions, and Section 2.3.4, Groundwater Quality). Chloride 1165
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concentrations exceeding 500 mg/L have been measured in the southeastern part of the Subbasin, where there is no direct connection between the inland freshwater aquifer and the Pacific Ocean.

Stable isotope studies of the groundwater in these wells have shown that the chloride concentrations are likely not a result of seawater intrusion, but rather originated from release of connate water in the fine-grained lagoonal deposits in the Oxnard and Mugu Aquifers (Izbicki 1996). The connate water is released as groundwater head in the aquifer declines and the finegrained deposits compress. Additionally, chloride concentrations in the UAS are also impacted by downward migration of brackish water from the semi-perched aquifer via improperly abandoned wells (Izbicki 1996). In the LAS, chloride concentrations above 500 mg/L result from seawater intrusion, as well as from upward migration of brines from the geologic formations that underlie and surround the Subbasin (Izbicki 1991).

The minimum thresholds metric against which seawater intrusion will be measured is water levels that were selected to prevent lateral seawater intrusion. These groundwater elevations are equal to, or higher than, previous historical low water levels (Table 3-1). Some of the minimum threshold groundwater elevations in the LAS are below sea level. These elevations were selected based on model results that indicate groundwater elevations could be this low and still limit seawater intrusion. They were also selected in concert with groundwater elevations in adjacent management areas, and are not expected to negatively impact the ability of the adjacent management areas to meet their sustainability goals.

The groundwater elevations selected in each of the management areas of the Oxnard Subbasin will be used to determine whether seawater intrusion is occurring in the Saline Intrusion Management Area and the West Oxnard Plain Management Area (WOPMA) of the Subbasin (Figure 2-69).

Until a monitoring well is installed in the EOPMA, the water level thresholds set for the wells closest to the EOPMA in the WOPMA and the Oxnard Pumping Depression Management Area are presumed to be protective for the EOPMA, which has considerably less groundwater production than the adjoining management areas. This presumption will be revisited as groundwater elevation data are collected from the EOPMA.

Seawater intrusion in the Oxnard Subbasin has the potential to impact the beneficial uses and users of groundwater in the Subbasin by limiting the volume of non-brackish groundwater available for agricultural, municipal, industrial, and domestic use. These impacts will affect all users of groundwater in the Subbasin and continued seawater intrusion could result in changing land use as agricultural land is fallowed due to reduced groundwater supplies. 1166
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3.3.4 Degraded Water Quality

3.3.4.1 Chloride and TDS
Significant and unreasonable degraded water quality related to groundwater production is an undesirable result that has the potential to occur in the Oxnard Subbasin. Increases in chloride and total dissolved solids (TDS) have been observed in coastal areas of the Oxnard Subbasin including parts of the WOPMA and the Saline Intrusion Management Area. These increases are associated with seawater intrusion as well as connate water in fine-grained lenses, downward migration of brines from improperly abandoned wells, and upward migration of brines from deeper geologic formations (Izbicki 1991, 1996; UWCD 2016).

Degradation of groundwater quality from increased concentrations of chloride and TDS has the potential to impact the beneficial uses and users of groundwater in the Subbasin by (1) limiting the volume of groundwater available for agricultural, municipal, industrial, and domestic use or (2) requiring construction of treatment facilities to remove the constituents of concern.

The primary cause of groundwater conditions in the Subbasin that would lead to degradation of water quality from increased concentrations of TDS and chloride is groundwater production. If groundwater production from the Subbasin results in expansion of areas of the Subbasin impacted by chloride and TDS concentrations that limit agricultural and potable use, significant and unreasonable degradation of water quality may occur.

Based on the sustainability goals for the Oxnard Subbasin, the criterion used to define undesirable results for degraded water quality is the migration of the 2015 saline water impact front during the sustaining period from 2040 through 2069. The minimum thresholds metric against which degradation of water quality will be measured is groundwater levels that were selected to prevent net landward migration of the 2015 saline water impact front. The minimum thresholds metric against which seawater intrusion will be measured is groundwater levels that were selected to prevent net landward seawater migration. These groundwater elevations are equal to, or higher than, previous historical low water levels (Table 3-1).

Water quality will continue to be monitored at monitoring well locations identified by FCGMA and its partner agencies, as identified in Chapter 4, Monitoring Networks. As additional data are collected, the effectiveness of applying a water level proxy to groundwater quality degradation will continue to be assessed.

3.3.4.2 Nitrate
In the Oxnard Forebay area of the Oxnard Subbasin, nitrate concentrations above the water quality objectives (WQOs) and basin management objectives (BMOs) are routinely detected in 1167
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groundwater (UWCD 2008). These concentrations have resulted in significant and unreasonable impacts to beneficial uses and users of the Oxnard Subbasin, as not all municipal users of groundwater in this area have the ability to blend groundwater with nitrate exceeding the federal maximum contaminant level (MCL) with other water to sufficiently reduce the nitrate concentration for municipal use. Although nitrate concentrations in the Forebay have impacted municipal users of groundwater, the concentrations of nitrate in the Forebay are not caused by groundwater conditions occurring throughout the Subbasin. Rather, nitrate concentrations above WQOs and BMOs in the Forebay are likely a legacy of historical septic discharges and agricultural fertilizer application practices.
1 Although nitrate concentrations decrease when water levels are high, the decreases are not a result of regional groundwater production patterns. Instead, the reduction in nitrate concentration results from dilution of nitrate in groundwater by lower nitrate concentration surface-water recharge from the Santa Clara River. Operationally, in years when surface-water diversions are lower than the overall demand, UWCD prioritizes surface-water recharge in areas where nitrate concentrations in the groundwater exceed the MCL over deliveries to areas with lower concentrations of nitrate in the groundwater. UWCD currently anticipates maintaining and potentially increasing surfacewater recharge from the Santa Clara River in the future. Increases in surface-water recharge, combined with the cessation of septic discharges and modern agronomic fertilization practices, are anticipated to result in long-term declines in nitrate concentration in the Forebay.

Because nitrate concentrations are not impacted by local or regional groundwater production, and the currently impacted area is not anticipated to get larger in the future, the concentration of nitrate is not considered to be a SGMA sustainability indicator in the Subbasin. Because nitrate impacts are not a sustainability indicator, no minimum threshold concentration for nitrate is proposed at this time. Nitrate concentrations will continue to be monitored and the relationship between groundwater production and nitrate concentrations will be reevaluated during the 5-year evaluation.

3.3.5 Land Subsidence
The undesirable result associated with land subsidence in the Oxnard Subbasin is subsidence that substantially interferes with surface land uses. The FCGMA Board resolution discussed in Section

3.1, Introduction to Sustainable Management Criteria, calls for groundwater management that will not result in net subsidence due to groundwater withdrawal. Subsidence related to groundwater withdrawal can occur as groundwater elevations decline below previous historical low water levels, because the groundwater acts to reduce the effective stress, or pressure, on the sediments in the aquifers. As water levels decline, the pressure on the sediment matrix increases, and the pore structure of the sediment can collapse, resulting in subsidence. The minimum thresholds metric

1 Ventura County extended sewer lines into this area in the years between 2000 and 2011 to address additional discharges of nitrate.
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against which subsidence will be measured is water levels that were selected to prevent lateral seawater intrusion. These groundwater elevations are equal to, or higher than, previous historical low water levels, which will limit the potential for future land subsidence in the Subbasin resulting from groundwater withdrawal (Table 3-1).

Groundwater production is only one cause of subsidence in the Oxnard Subbasin. In addition to groundwater production, tectonic forces and oil and gas production can also result in subsidence in the Oxnard Subbasin (Section 2.3.5, Subsidence). Currently there are no monitoring stations that separate the effects of groundwater withdrawal from those of the other causes of subsidence.

Groundwater production from the Subbasin may result in significant and unreasonable land subsidence if the subsidence “substantially interferes with surface land uses” (California Water Code, Section 10721(x)(5)). Using this definition, historical records of land subsidence in the Subbasin do not indicate that land subsidence as a result of groundwater production has caused or is likely to cause undesirable results. Parts of the Oxnard Plain have experienced 2 to 3 feet of subsidence in the past, and future projections of subsidence indicate that areas within the Oxnard Plain may experience an additional 0.1 to 1 feet of subsidence by 2040 (Hanson et al. 2003; DWR 2014).

Land subsidence related to groundwater production has the potential to impact the beneficial uses and users of groundwater in the Oxnard Subbasin by interfering with surface land uses in a way that causes additional costs for releveling fields, replacing surface infrastructure, and otherwise interfering with surface land uses. Additional subsidence of 0.1 to 1 feet is not anticipated to substantially interfere with surface land uses in the Subbasin.

Even though substantial interference with land surface uses is not anticipated, actions to reduce groundwater production to a rate that avoids net seawater intrusion will mitigate future seawater intrusion as well as reducing the potential for additional subsidence in the Subbasin related to groundwater production.

3.3.6 Depletions of Interconnected Surface Water
The undesirable result associated with depletion of interconnected surface water in the Oxnard Subbasin is loss of groundwater-dependent ecosystem (GDE) habitat.

The primary cause of groundwater conditions in the Subbasin that would lead to depletion of interconnected surface water is groundwater production from the semi-perched aquifer. This unit is not currently considered a principal aquifer of the Oxnard Subbasin (Section 2.2.3, Principal Aquifers and Aquitards). Groundwater production from the semi-perched aquifer may result in depletion of interconnected surface water with significant and unreasonable adverse effects on beneficial uses of surface water if the groundwater levels were lowered to an elevation below which the vegetation in the existing GDEs could not access groundwater over a length of time 1169
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that negatively affected the health of the GDE. Historically, this condition has not occurred within the Oxnard Subbasin, because there has been very minor (<31 AFY) groundwater production from the semi-perched aquifer (Section 2.4.1.2, Imported Water Supplies).

Depletion of interconnected surface water in the Oxnard Subbasin is not currently occurring, as evidenced by lack of production, relatively stable groundwater elevations, and the need for tile drains in the semi-perched aquifer. Groundwater elevations will continue to be monitored in the semiperched aquifer.

Depletion of interconnected surface water in the Oxnard Subbasin has the potential to impact the uses and users of groundwater in the Subbasin by lowering the groundwater table and negatively impacting the health of GDEs. If future projects involve the use of water from the semi-perched aquifer, depletion of interconnected surface water is possible, and significant and unreasonable impacts may occur. Reevaluation of the effects on existing and potential GDEs should be conducted in conjunction with the project approval process for any such future projects.

3.3.7 Defining Subbasin-Wide Undesirable Results
In order to better manage groundwater production and projects within the Oxnard Subbasin, the Subbasin has been divided into four management areas (Section 2.5, Management Areas).

Groundwater production in each of the management areas occurs in both the UAS and LAS (Table 2-14, Oxnard Subbasin Groundwater Used). Although there are groundwater production wells screened in both the UAS and the LAS in the Oxnard Subbasin, there are a sufficient number of wells screened only in one of the two aquifer systems to be able to manage groundwater production in the Subbasin by aquifer system. In contrast, there are few production wells screened only within an individual aquifer in the Subbasin. Therefore, the discussion of Subbasin-wide undesirable results that follows has been separated by aquifer system, but not by individual aquifer.

Upper Aquifer System
Fifteen wells were selected as key wells in the UAS (Table 3-1). 2 Of these, three are in the Forebay
Management Area, three are in the West Oxnard Plain Management Area, and nine are in the Saline Intrusion Management Area. None of the UAS key wells are located in the Oxnard Pumping Depression Management Area.

2 Well 02N21W07L05 is screened in multiple aquifers, and has been assigned to the UAS for the purpose of defining undesirable results.
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Undesirable results are defined in three ways for the UAS in the Oxnard Subbasin. The first is based on the total number of wells, independent of management area or aquifer. Under this definition, the UAS will be determined to be experiencing undesirable results if, in any single monitoring event, water levels in six of the 15 key wells are below their respective minimum thresholds.

The second definition of undesirable results for the UAS is based on the degree to which a single well exceeds a minimum threshold. Under this definition, the UAS would be determined to be experiencing an undesirable result if the groundwater elevation at any individual key well is below the historical low water level for that well.

The third definition of undesirable results for the UAS is based on the time over which a well may exceed the minimum threshold. Under this definition, the UAS would be determined to be experiencing an undesirable result if the water level in any individual key well was below the minimum threshold for either three consecutive monitoring events or three of five consecutive monitoring events. Monitoring events are scheduled to occur in the spring and fall of each year.

If conditions in the UAS meet any of the definitions of undesirable results listed above, the UAS would be considered to be experiencing undesirable results.

Lower Aquifer System
Nineteen wells were selected as key wells in the LAS (Table 3-1).3 Of these, six are in the Forebay Management Area, five are in the West Oxnard Plain Management Area, six are in the Saline Intrusion Management Area, and two are in the Oxnard Pumping Depression Management Area.

Undesirable results are defined in three ways for the LAS in the Oxnard Subbasin. The first is based on the total number of wells, independent of management area or aquifer. Under this definition, the LAS will be determined to be experiencing undesirable results if, in any single monitoring event, water levels in 8 of the 19 key wells are below their respective minimum thresholds.

The second definition of undesirable results for the LAS is based on the degree to which a single well exceeds a minimum threshold. Under this definition, the LAS would be determined to be experiencing an undesirable result if the groundwater elevation at any individual key well is below the historical low water level for that well.

The third definition of undesirable results for the LAS is based on the time over which a well may exceed the minimum threshold. Under this definition, the LAS would be determined to be experiencing an undesirable result if the water level in any individual key well were below the minimum threshold for either three consecutive monitoring events or in three of five consecutive monitoring events. Monitoring events are scheduled to occur in the spring and fall of each year.

3 Wells 02N21W07L03, 01N21W07J02, and 01N21W07L03 are screened in multiple aquifers and have been assigned to the LAS for the purpose of defining undesirable results. 1171
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If conditions in the LAS meet any of the definitions of undesirable results listed above, the LAS would be considered to be experiencing undesirable results.

3.4 MINIMUM THRESHOLDS
The following sections and discussion set forth the minimum thresholds for each of the six sustainability indicators. These thresholds discussed below are the proposed minimum groundwater elevations that would prevent undesirable results, defined as net landward migration of the 2015 saline water impact front, net seawater intrusion in the UAS, or net seawater intrusion in the LAS.

When groundwater elevations drop below the proposed minimum threshold, the Subbasin may experience undesirable results (Section 3.3.7, Defining Subbasin-Wide Undesirable Results).

The minimum thresholds for chronic lowering of water levels, change in groundwater storage, seawater intrusion, groundwater quality, and land subsidence are based on the historical record of groundwater elevation in individual aquifers, the documented impacts of seawater intrusion, and the hydrogeologic conceptual model developed for the Oxnard Subbasin. All of these undesirable results are interrelated, and each is directly tied to seawater intrusion. Because groundwater elevations, change in storage, and groundwater quality are directly tied to seawater intrusion, the minimum threshold groundwater levels selected to mitigate the effects of seawater intrusion are also used for the other undesirable results as well (Table 3-1).

The minimum threshold groundwater levels selected to prevent seawater intrusion were based on a review of the historical groundwater elevation data and an analysis of the potential for seawater intrusion under multiple future groundwater production scenarios. Predicted groundwater levels were simulated over a 50-year period from 2020 to 2069 (Section 2.4.5, Projected Future Water Budget and Sustainable Yield). The future climate simulated in the model recreated the observed climate from 1930 to 1979, with adjustments to precipitation and streamflow based on climate change factors provided by the California Department of Water Resources (DWR). The historical period from 1930 to 1979 includes periods of drought and periods of above-average precipitation, but has the average precipitation of the entire climate record for the Oxnard Subbasin (Section 2.4.5).

The 50-year future simulations were used to assess the rate of groundwater production that results in no net seawater intrusion in either the UAS or the LAS in the Oxnard Subbasin after 2040.

Two simulations were found to minimize net seawater intrusion after 2040 (Figures 2-67a through 2-67e, UWCD Model Particle Tracks for the Reduction With Projects Simulation, and Figures 2-68a through 2-68e, UWCD Model Particle Tracks for the Reduction Without Projects Simulation 1; Section 2.4). Groundwater production in the first simulation, referred to as the Reduction With Projects Scenario (Section 2.4.5.3), averaged approximately 40,000 AFY, with 27,000 AFY of production in the UAS, and 13,000 AFY in the LAS. This simulation incorporated projects, including temporary fallowing of approximately 500 AFY in the Oxnard Subbasin, and deliveries 1172
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of approximately 4,000 AFY of recycled water from the City of Oxnard’s Groundwater Recovery Enhancement and Treatment (GREAT) Program for irrigation in the coastal area. Groundwater production in the second simulation, referred to as the Reduction Without Projects Scenario 1 (Section 2.4.5.4), averaged approximately 39,000 AFY, with 27,000 AFY of production in the UAS, and 12,000 AFY in the LAS (Section 2.4.5). In general, the simulated groundwater elevations in the model scenario with projects were close to those in the scenario without projects, with any observed difference between the two limited to less than approximately 10 feet (Figures 3-6 through 3-11, Key Well Hydrographs).

The minimum threshold groundwater elevations selected to protect against net seawater intrusion in the UAS and LAS are based on the lowest simulated groundwater elevation after 2040 for the two model simulations in which net seawater intrusion was minimized. To account for some of the uncertainty in the simulated future groundwater elevations, the lowest simulated value in either of the two simulations was used as a starting point for selecting the minimum thresholds. The lowest simulated value was then rounded down to the nearest 5-foot interval to further account for uncertainty in the future simulated groundwater elevations. The rounded groundwater elevation was then raised by 2 feet to account for predicted sea level rise by 2070. The minimum thresholds for each well are presented in Table 3-1 and Figures 3-6 through 3-11.

There are no proposed minimum thresholds in the EOPMA because there are no suitable monitoring wells in the EOPMA (Figure 2-69). The thresholds for the Saline Intrusion Management Area and Oxnard Pumping Depression Management Area, both of which border the EOPMA, are presumed to protect the EOPMA, which has considerably less groundwater production than the adjoining management areas (see Section 2.5). This presumption will be revisited as groundwater elevation data are collected from the EOPMA.

It is important to remember that there are several sources of uncertainty in the model predictions.

These sources of uncertainty include, but are not limited to, the prediction of future climate, future diversions from the Santa Clara River, groundwater model assumptions and assigned values, and future groundwater production distribution in the Subbasin. The uncertainty in each of these factors is anticipated to decrease with time. As these factors are better understood, the minimum thresholds should be reassessed, and adjustments should be made, when warranted by the assessment.

3.4.1 Chronic Lowering of Groundwater Levels
The selected minimum thresholds for chronic lowering of groundwater levels are presented in Table 3-1. These minimum thresholds are water levels that were selected based on future groundwater model simulations that limit migration of the 2015 saline water impact front after 2040, limit net seawater intrusion into the UAS and LAS, and indicate that declines in groundwater elevations during periods of future drought will be offset by recoveries during future periods of above-average rainfall.
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These minimum thresholds are anticipated to improve the beneficial uses of the Subbasin by limiting seawater intrusion and chronic lowering of groundwater levels. This allows for long-term use of groundwater supplies in the Subbasin without ongoing loss of storage that would cause economic harm to the users of groundwater in the Subbasin and impair the beneficial uses of groundwater in the Subbasin.

These minimum thresholds may impact groundwater users in the Subbasin by requiring both an overall reduction in groundwater production relative to historical levels, and potentially by requiring a redistribution of groundwater pumping within the Subbasin. A redistribution of groundwater production to shift groundwater production inland may require inland users to deepen existing wells or replace wells, and may require adjustment of the currently proposed minimum thresholds in the future. Furthermore, the minimum threshold groundwater elevations may result in a return to artesian conditions in wells screened in the UAS and LAS adjacent to the coast. In these areas, improperly abandoned wells can act as conduits for flow from the aquifer systems to land surface. Additional efforts may need to be undertaken by FCGMA and stakeholders in the Subbasin to prevent negative impacts from rising water levels and improperly abandoned wells.

The minimum thresholds for chronic lowering of groundwater levels are water levels that will be measured at the monitoring wells listed in Table 3-1. Groundwater levels in these wells, which are referred to as “key wells,” will be reported to DWR in the annual reports that will follow the submittal of this GSP. Additionally, as funding becomes available, it is recommended that each of these monitoring wells be instrumented with a pressure transducer capable of recording hourly water levels.

The groundwater elevation in each well will be compared to the minimum threshold assigned in Table 3-1 to determine whether water levels in individual wells are above the minimum thresholds.

3.4.2 Reduction of Groundwater Storage
The minimum thresholds for reduction in groundwater storage are water levels that were selected based on future groundwater model simulations that limit seawater intrusion in the Subbasin, and indicate that declines in groundwater elevations during periods of future drought will be offset by recoveries during future periods of above-average rainfall (Table 3-1). The minimum thresholds impacts to groundwater users for reduction of groundwater storage are the same as those for chronic lowering of groundwater levels. These minimum thresholds are anticipated to improve the beneficial uses of the Subbasin by allowing for long-term use of groundwater supplies in the Subbasin without replacing freshwater in the UAS and LAS with seawater. Such a replacement would lead to a loss of storage that would cause economic harm to the users of groundwater in the Subbasin and impair the beneficial uses of groundwater in the Subbasin. 1174
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The minimum thresholds for reduction of groundwater storage are water levels that will be measured at the key wells two times per year. Additionally, as funding becomes available, it is recommended that each key well be instrumented with a pressure transducer capable of recording hourly water levels. The groundwater elevation in each well will be compared to the minimum threshold assigned in Table 3-1 to determine whether water levels in individual wells are above the minimum thresholds.

3.4.3 Seawater Intrusion
Because the concentration of chloride is not necessarily the best indicator of modern seawater intrusion, the relationship between seawater intrusion and groundwater elevation was investigated using a numerical groundwater model (Appendix C). Groundwater levels in the Oxnard and Mugu Aquifers in coastal areas have historically fallen below sea level in response to increased production and drought cycles since the 1950s (Figure 2-9a, Groundwater Well Hydrographs in the Oxnard Aquifer – Oxnard Plain, and Figure 2-12, Groundwater Well Hydrographs in the Mugu Aquifer).

The groundwater levels below sea level resulted in seasonal seawater intrusion during the fall irrigation season and during droughts in coastal wells in the vicinity of Point Hueneme and Point Mugu (Figure 2-35, Selected Historical Records of Water Elevation and Chloride Concentration).

Modeling by UWCD (2018; see Appendix C to this GSP) indicates that there was flux from the ocean into the Oxnard and Mugu Aquifers in the vicinity of the offshore Mugu and Hueneme Submarine Canyons when the coastal groundwater levels in the UAS fell below 5 to 10 feet above mean sea level. In 1990, FCGMA directed pumpers to decrease production in these aquifers to mitigate seawater intrusion. As a result, production in coastal areas shifted from the Oxnard and Mugu Aquifers to the deeper Hueneme Aquifer, the Fox Canyon Aquifer (FCA), and the Grimes Canyon Aquifer (the aquifers that compose the LAS). Water levels in the FCA and the Grimes Canyon Aquifer near the coast quickly fell below sea level and have remained there since the 1980s, even after periods of above-average precipitation (Figure 2-18, Groundwater Well Hydrographs in the Fox Canyon Aquifer, and Figure 2-21, Groundwater Well Hydrographs in the Grimes Canyon Aquifer). The UWCD model indicates continuous flux from the ocean into these aquifers since 1985 (Figure 2-34, Groundwater Flux along the Coast in the Lower Aquifer System).

Because the model indicates a strong relationship between groundwater elevation and seawater intrusion, the minimum thresholds for addressing seawater intrusion are water levels that were selected based on future groundwater model simulations that limited seawater intrusion in the UAS and LAS (Table 3-1). The model simulations suggest that if water levels fall below the minimum threshold elevations, the Subbasin is likely to experience net landward migration of the 2015 saline water impact front after 2040. These minimum thresholds are anticipated to improve the beneficial uses of the Subbasin by limiting seawater intrusion. This allows for long-term use of groundwater supplies in the Subbasin without ongoing loss of storage that would cause economic harm to the users of groundwater in the Subbasin and impair the beneficial uses of groundwater in the Subbasin. 1175
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Groundwater users in the Subbasin may be impacted by the minimum thresholds in several ways.

First, an overall reduction in groundwater production relative to historical levels will be required to achieve the minimum thresholds. Such a reduction may impact the value of agricultural land, drive changes in crop types, result in temporary fallowing of agricultural acreage, and cause economic disruption to the regional economy. Second, a redistribution of groundwater pumping may be required to optimize water management in the Subbasin. If groundwater production is reduced at the coast and shifted inland, additional infrastructure may be needed to convey water from the inland areas to the coast, inland users may be required to deepen existing wells, and the currently proposed minimum thresholds may need to be lowered for inland areas in the future.

Third, as the minimum thresholds are achieved in the coastal areas, additional economic impacts may occur as improperly abandoned wells may need to be properly sealed so they do not act as a conduit for flow from the underlying aquifers.

The minimum thresholds were selected for each aquifer system in the Oxnard Subbasin, primarily using wells screened in a single aquifer. These wells will be used to monitor groundwater elevations in each aquifer system in the Subbasin. Additionally, as funding becomes available, it is recommended that each key well be instrumented with a pressure transducer capable of recording hourly water levels. The groundwater elevation in each well will be compared to the minimum threshold assigned in Table 3-1 to determine whether water levels in individual wells are above the minimum thresholds.

3.4.4 Degraded Water Quality
Water quality impacts to the aquifer systems of the Oxnard Subbasin are limited to high concentrations of nitrate, chloride, and TDS. The sources and mechanisms controlling the concentration of these constituents differs throughout the Subbasin (Section 2.3). Nitrate concentrations in the Forebay exceed the federal MCL in some wells. However, these concentrations cannot be reduced by altering groundwater production in the Subbasin. For these concentrations, the recharge source water should be of the highest quality possible to maintain or improve future groundwater quality (Section 3.3.4, Degraded Water Quality). Although FCGMA cannot control the quality of the recharge water, the groundwater elevations minimum thresholds to prevent net migration of seawater after 2040 are higher than the historical low groundwater elevations at which nitrate concentrations were observed to exceed the federal MCL. These groundwater elevations will be used as the minimum thresholds to prevent further degradation of groundwater quality in the Forebay until such time that a separate concentration minimum threshold is found to be necessary.

In contrast to concentrations of nitrate in the Forebay, the concentration of chloride and TDS in coastal wells is influenced by groundwater production. Concentrations of chloride and TDS exceed federal, state, and local standards in some wells in the Subbasin (Section 2.3). Groundwater 1176
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production near the coast induces seawater intrusion, and lowered groundwater elevations induce compaction of fine-grained sediments that release connate brines into the aquifers. Because both of these processes are tied to groundwater elevations in the Subbasin, minimum thresholds for groundwater elevation, rather than concentration, were set to control the additional impacts from seawater and brine migration in the aquifers (Section 3.4.3, Seawater Intrusion). The minimum thresholds selected are the same as the water level thresholds selected to prevent net migration of the 2015 saline water impact front after 2040. These groundwater elevations are higher than historical low elevations, which will prevent further compaction of fine-grained sediments and brine release. They are also designed to prevent further degradation of water quality from direct seawater intrusion.

As discussed previously, the minimum thresholds are anticipated to improve the beneficial uses of the Subbasin by increasing the overall amount of freshwater storage in the Subbasin and limiting the further intrusion of seawater. The minimum thresholds impacts to groundwater users for degraded water quality are anticipated to be the same as those for seawater intrusion, which are described in Section 3.4.3.

The minimum thresholds for degraded water quality are water levels that will be measured at the monitoring wells listed in Table 3-1. Additionally, as funding becomes available, it is recommended that each key well be instrumented with a pressure transducer capable of recording hourly water levels. The groundwater elevation in each well will be compared to the minimum threshold assigned in Table 3-1 to determine whether water levels in individual wells are above the minimum thresholds.

3.4.5 Land Subsidence
The minimum thresholds for land subsidence are water levels that were selected based on future groundwater model simulations that limit seawater intrusion in the Subbasin, and indicate that declines in groundwater elevations during periods of future drought will be offset by recoveries during future periods of above-average rainfall (Table 3-1). As groundwater withdrawals will be reduced to avoid further seawater intrusion, groundwater elevations in the aquifer systems will rise, and the resulting minimum thresholds are higher than historical low water levels. Because groundwater elevations must be maintained above the minimum threshold in order to avoid undesirable results for seawater intrusion and loss of freshwater storage, water levels in the Subbasin will remain above historical low water levels after 2040. Therefore, water levels in the Subbasin will not induce inelastic subsidence in the Subbasin. If the distribution of pumping is altered to mitigate seawater intrusion by reducing pumping near the coast and increasing pumping in the Forebay, the potential subsidence risk may have to be revisited in inland areas. This risk evaluation should be tied to areas in which the minimum thresholds are lowered below previous historical low water levels.
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As discussed previously, the minimum thresholds are anticipated to improve the beneficial uses of the Subbasin by increasing the overall amount of freshwater storage in the Subbasin and limiting the further intrusion of seawater. These minimum thresholds also will limit future subsidence because currently they are greater than the historical low groundwater elevation. The minimum thresholds impacts to groundwater users for land subsidence are anticipated to be the same as those for seawater intrusion, which are described in Section 3.4.3.

The minimum thresholds for subsidence are water levels that will be measured at the monitoring wells listed in Table 3-1. Additionally, as funding becomes available, it is recommended that each key well be instrumented with a pressure transducer capable of recording hourly water levels. The groundwater elevation in each well will be compared to the minimum threshold assigned in Table 3-1 to determine whether water levels in individual wells are above the minimum thresholds.

3.4.6 Depletions of Interconnected Surface Water
The minimum thresholds for depletions of interconnected surface water are water levels that were selected based on future groundwater model simulations that limit seawater intrusion in the Subbasin, and indicate that declines in groundwater elevations during periods of future drought will be offset by recoveries during future periods of above-average rainfall (Table 3-1). The areas of interconnected surface water and groundwater and associated GDEs described in Section 2.3.6, Groundwater–Surface Water Connections, and Section 2.3.7, Groundwater-Dependent Ecosystems, are connected to the semi-perched aquifer, from which there is little current groundwater production. Because the semi-perched aquifer is not considered a principal aquifer, specific minimum thresholds were not selected for this unit. Instead, results of the numerical groundwater model scenarios that prevent net landward migration of the 2015 saline water impact front after 2040 indicate that groundwater elevations in the semi-perched aquifer will be supported by groundwater elevations in the underlying Oxnard Aquifer. The Oxnard Aquifer is the uppermost aquifer of the UAS. The simulated minimum threshold water levels in the Oxnard Aquifer that prevent net migration of the 2015 saline water impact front after 2040 were found to result in higher water levels in the semi-perched aquifer. Therefore, the minimum thresholds for depletions of interconnected surface water are water levels in the Oxnard Aquifer that also prevent net migration of the 2015 saline water impact front after 2040. The minimum thresholds are equal to or higher than the lowest groundwater elevation measured at these wells. The selected groundwater elevations are anticipated to protect against depletion of interconnected surface water, because historical groundwater elevations in the semi-perched aquifer have maintained the documented and potential GDEs in the Subbasin (Section 2.3).

As discussed previously, the minimum thresholds are anticipated to improve the beneficial uses of the Subbasin by increasing the overall amount of freshwater storage in the Subbasin and limiting the further intrusion of seawater. The minimum thresholds set will maintain the existing beneficial 1178
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uses of the semi-perched aquifer by maintaining groundwater elevations equal to or higher than historical lows. The minimum thresholds impacts to groundwater users for interconnected groundwater and surface water are anticipated to be the same as those for seawater intrusion, which are described in Section 3.4.3.

Currently there is very little groundwater production from the semi-perched aquifer. If water levels in this aquifer rise as a result of reduced groundwater production in the underlying UAS, additional projects may investigate producing water from the semi-perched aquifer. Such projects will have to evaluate the potential impact to interconnected surface water and GDEs as part of the feasibility and permitting process. Additionally, if projects that produce groundwater from the semi-perched aquifer are implemented, the need for specific water level minimum thresholds in the semi-perched aquifer should be reevaluated.

The minimum thresholds for interconnected surface water are water levels that will be measured at the monitoring wells listed in Table 3-1. Additionally, as funding becomes available, it is recommended that each key well be instrumented with a pressure transducer capable of recording hourly water levels. The groundwater elevation in each well will be compared to the minimum threshold assigned in Table 3-1 to determine whether water levels in individual wells are above the minimum thresholds.

3.5 MEASURABLE OBJECTIVES
The measurable objectives are quantifiable goals for the maintenance or improvement of specified groundwater conditions that have been included in an adopted GSP to achieve the sustainability goal.

For the Oxnard Subbasin, the measurable objective is the water level—measured at each of the key wells throughout the Subbasin—at which there is neither seawater flow into nor freshwater flow out of the UAS or LAS. If water levels in the Subbasin remained at the measurable objective in perpetuity, no groundwater would flow from the aquifer systems into the Pacific Ocean, and no ocean water would flow into the aquifer systems. This is the theoretical ideal water level for managing the aquifer systems of the Subbasin, because seawater intrusion would be prevented while maintaining the maximum freshwater use from the aquifer systems. However, because groundwater elevations in the Oxnard Subbasin respond to climatic cycles, actual groundwater levels in the Subbasin cannot be maintained at the measurable objective indefinitely. Therefore, to allow for operational flexibility while still preventing net migration of the 2015 saline water impact front after 2040, the measurable objectives were selected to work with the minimum thresholds in the Oxnard Subbasin.

To allow for operational flexibility during drought periods, water levels in the Subbasin are allowed to fall below the measurable objective, so long as they remain above the minimum threshold. As water levels fall below the measurable objective, seawater will flow toward the freshwater aquifer systems in the Subbasin, even if the water levels remain above the minimum threshold. The longer 1179
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groundwater elevations remain between the measurable objective and the minimum threshold the greater the volume of seawater that will migrate into the aquifer systems. In order to prevent net seawater intrusion over periods of drought and recovery, the periods during which seawater intrusion occurs must be offset by periods when the groundwater elevations are higher.

There are two components to balancing groundwater levels over climate cycles to prevent net migration of the 2015 saline water impact front after 2040. The first is not allowing groundwater levels to decline below an elevation at which net seawater intrusion will occur. This elevation is the minimum threshold. The second is ensuring that periods during which groundwater levels are above the minimum threshold but below the measurable objective are offset by equal periods during which groundwater levels are above the measurable objective. Therefore, the measurable objectives were selected based on the median groundwater elevation between 2040 and 2070, simulated for each well, in model simulations that prevented net landward migration of the 2015 saline water impact front after 2040.

The median groundwater elevation was rounded down to the nearest 5-foot interval to account for uncertainty in the model simulated future groundwater elevations. In order to account for future sea level rise, the rounded groundwater elevations were increased by 2 feet. The median simulated groundwater elevation (from 2040 to 2070) at each well after rounding and accounting for sea level rise is the measurable objective (Table 3-1). In order to prevent net seawater intrusion in the Subbasin after 2040, observed groundwater levels should be above the measurable objective 50% of the time.

Ideally, the periods during which the water levels are above the measurable objectives will coincide with periods of above-average precipitation. If this occurs, additional reductions in groundwater production are not anticipated to be required to offset seawater intrusion. If, however, prolonged periods of drought limit the ability to recharge the groundwater aquifers in the Oxnard Subbasin, additional reductions in groundwater production may be required to offset seawater intrusion.

3.5.1 Chronic Lowering of Groundwater Levels
The measurable objective for the chronic lowering of groundwater levels is the groundwater level at which there is neither seawater flow into nor freshwater flow out of the UAS or LAS. This groundwater level is the same groundwater level that is used to protect against seawater intrusion in the Subbasin. The measurable objective groundwater level was selected for each of the key wells (Table 3-2). At each of these wells, the difference between the measurable objective and the minimum threshold is greater than 10 feet, which provides a margin of safety for operational flexibility in the Subbasin.

Groundwater elevations within each management area of the Oxnard Subbasin will be used to determine whether chronic lowering of groundwater levels is occurring. All of the management areas except the EOPMA have wells in which water levels can be monitored by aquifer. Until a 1180
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monitoring well is installed in the EOPMA, the measurable objectives set for the wells in the Saline Intrusion Management Area and Oxnard Pumping Depression Management Area, closest to the EOPMA, are presumed to also protect the EOPMA. The EOPMA has considerably less groundwater production than the WOPMA and does not have an independent suitable monitoring well for selecting a separate measurable objective. This presumption will be revisited as groundwater elevation data are collected from the EOPMA.

Interim Milestones for Chronic Lowering of Groundwater Levels Interim milestones, which are target groundwater levels in 2025, 2030, and 2035 at key wells, will be used to assess progress toward sustainable groundwater management in the Oxnard Subbasin between 2020 and 2040. The interim milestones for chronic lowering of groundwater levels are the same as the interim milestones for seawater intrusion, because the interim milestones measure progress toward groundwater elevations in the Subbasin that prevent the net migration of the 2015 saline water impact front after 2040.

Two sets of interim milestones were determined for the key wells in the Subbasin (Table 3-2). The first set of interim milestones was calculated using linear interpolation between the fall 2015 low groundwater elevation and measurable objective (Figure 3-12, Interim Milestones for Dry and Average Conditions – Linear Interpolation). The second set was calculated using linear interpolation between the fall 2015 low groundwater elevation and the minimum threshold (Figure 3-12).

Two sets of interim milestones were calculated because the actual groundwater elevation in 2040 will depend both on groundwater production from the Subbasin and the climatic conditions between 2020 and 2040. Groundwater model simulations of future groundwater levels show that groundwater levels throughout the Subbasin vary by tens of feet at constant groundwater production rates over 5-year periods. This variability reflects the variability in annual precipitation, flow in the Santa Clara River, and groundwater recharge through the UWCD spreading grounds.

Just as annual climate conditions vary from the calculated long-term historical mean conditions, so do 5-year average climate conditions (Figure 3-13, Distribution of 5-Year Average Climate Conditions in the Historical Record of Precipitation on the Oxnard Plain). Therefore, progress toward the measurable objective, which is the anticipated median groundwater level necessary to prevent net migration of the 2015 saline water impact front after 2040, must be evaluated in the context of the climate that occurred during the preceding 5 water years.

If, for example, the average precipitation from water years 2020 through 2024 (October 1, 2019, through September 30, 2024) equals the long-term historical average precipitation for the Oxnard Subbasin, then, as groundwater production is reduced, the groundwater level at each key well should reach the interim milestone for average climate conditions shown in Table 3-2. Under these conditions, groundwater levels in the Subbasin would be expected to reach the measurable 1181
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objective by 2040. If, however, the precipitation from water years 2020 through 2024 is less than 70% of the average long-term historical precipitation, as has occurred six times in the historical record (Figure 3-13), reductions in groundwater production anticipated as part of this GSP would not be sufficient for groundwater elevations to reach the interim milestone for average climate conditions. In order for the Subbasin to be sustainable in 2040 under ongoing dry climate conditions, the interim milestones should reflect progress toward the minimum threshold at each key well, rather than progress toward the measurable objective (Figure 3-13). Five-year climate conditions that fall between average and less than 70% of average would be expected to produce interim milestone groundwater elevations between those listed in Table 3-2.

Although specific interim milestones were not selected at each key well for above-average climate conditions, a similar analysis should be performed as part of the 5-year assessment process. For example, if the average precipitation from water years 2020 through 2024 exceeds 140% of the average long-term historical precipitation, as has occurred six times in the historical record (Figure 3-13), groundwater elevations in the fall of 2024 should be higher than the interim milestone groundwater elevation for average conditions listed in Table 3-2. Further, although Table 3-2 provides interim milestone groundwater elevations for the years 2030, 2035, and 2040, these interim milestones should be reassessed as part of the 5-year GSP evaluation process because of their climate dependence. The linear interpolation and resultant interim milestones should be updated based on the measured water level in the fall of 2024, 2029, and 2034 at each key well.

3.5.2 Reduction of Groundwater in Storage
The measurable objective for reduction of groundwater in storage is the groundwater level at which there is neither seawater flow into nor freshwater flow out of the UAS or LAS (Table 3-2). The measurable objective groundwater level was selected for each of the key wells based on the median predicted groundwater elevation between 2040 and 2070 from groundwater model simulations that minimized the migration of the 2015 saline water impact front after 2040. This groundwater level is the same groundwater level that is used to protect against seawater intrusion in the Subbasin. At each of the key wells, the difference between the measurable objective and the minimum threshold is greater than 10 feet, which provides a margin of safety for operational flexibility in the Subbasin.

All of the management areas except the EOPMA have wells in which water levels can be monitored by aquifer. Until a monitoring well is installed in the EOPMA, the measurable objectives set for the wells in the Saline Intrusion Management Area and Oxnard Pumping Depression Management Area, closest to the EOPMA, are presumed to also protect the EOPMA.

The EOPMA has considerably less groundwater production than the WOPMA and does not have an independent suitable monitoring well for selecting a separate measurable objective. This presumption will be revisited as groundwater elevation data are collected from the EOPMA. 1182
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Interim Milestones for Reduction of Groundwater in Storage Interim milestones for reduction of groundwater in storage are presented for two climate scenarios in Table 3-2. The two sets of interim milestones were calculated from a linear interpolation between the fall 2015 low groundwater elevation and either the measurable objective or the minimum threshold at each well. These interim milestones will be used to assess progress toward sustainable groundwater management in the Oxnard Subbasin between 2020 and 2040 as groundwater production from the Subbasin is reduced. The interim milestones for reduction of groundwater in storage are the same as the interim milestones for seawater intrusion.

3.5.3 Seawater Intrusion
The measurable objective for seawater intrusion is the groundwater level at which there is neither seawater flow into nor freshwater flow out of the UAS or LAS (Table 3-2). The measurable objective groundwater level was selected for each of the key wells based on the median predicted groundwater elevation between 2040 and 2070 from groundwater model simulations that minimized the migration of the 2015 saline water impact front after 2040. At each of the key wells, the difference between the measurable objective and the minimum threshold is greater than 10 feet, which provides a margin of safety for operational flexibility in the Subbasin.

All of the management areas except the EOPMA have wells in which water levels can be monitored by aquifer. Until a monitoring well is installed in the EOPMA, the measurable objectives set for the wells closest to the EOPMA in the Saline Intrusion Management Area and the Oxnard Pumping Depression Management Area are presumed to also protect the EOPMA. The EOPMA has considerably less groundwater production than the adjoining management areas and does not have an independent suitable monitoring well for selecting a separate measurable objective. This presumption will be revisited as groundwater elevation data are collected from the EOPMA.

Interim Milestones for Seawater Intrusion
Interim milestones for seawater intrusion are presented for two climate scenarios in Table 3-2. The two sets of interim milestones were calculated from a linear interpolation between the fall 2015 low groundwater elevation and either the measurable objective or the minimum threshold at each key well. These interim milestones will be used to assess progress toward sustainable groundwater management in the Oxnard Subbasin between 2020 and 2040 as groundwater production from the Subbasin is reduced.

3.5.4 Degraded Water Quality
The measurable objective for degraded water quality is the groundwater level at which there is neither seawater flow into nor freshwater flow out of the UAS or LAS (Table 3-2). The measurable 1183
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objective groundwater level was selected for each of the key wells based on the median predicted groundwater elevation between 2040 and 2070 from groundwater model simulations that minimized the migration of the 2015 saline water impact front after 2040. This groundwater level is the same groundwater level that is used to protect against seawater intrusion in the Subbasin. At each of the key wells, the difference between the measurable objective and the minimum threshold is greater than 10 feet, which provides a margin of safety for operational flexibility in the Subbasin.

Until a monitoring well is installed in the EOPMA, the measurable objectives set for the wells closest to the EOPMA in the Saline Intrusion Management Area and the Oxnard Pumping Depression Management Area are presumed to also protect the EOPMA. The EOPMA has considerably less groundwater production than the adjoining management areas and does not have an independent suitable monitoring well for selecting a separate measurable objective. This presumption will be revisited as groundwater elevation data are collected from the EOPMA.

Interim Milestones for Degraded Water Quality
Interim milestones for degraded water quality are presented for two climate scenarios in Table 3-2.

The two sets of interim milestones were calculated from a linear interpolation between the fall 2015 low groundwater elevation and either the measurable objective or the minimum threshold at each key well. These interim milestones will be used to assess progress toward sustainable groundwater management in the Oxnard Subbasin between 2020 and 2040 as groundwater production from the Subbasin is reduced. The interim milestones for degraded water quality are the same as the interim milestones for seawater intrusion.

3.5.5 Land Subsidence
The measurable objective for land subsidence is the groundwater level at which there is neither seawater flow into nor freshwater flow out of the UAS or LAS (Table 3-2). This groundwater level is higher than the historical low water level in each key well. Therefore, it will protect against land subsidence related to groundwater withdrawal. The measurable objective groundwater level was selected for each of the key wells based on the median predicted groundwater elevation between 2040 and 2070 from groundwater model simulations that minimized the migration of the 2015 saline water impact front after 2040. This groundwater level is the same groundwater level that is used to protect against seawater intrusion in the Subbasin. At each of the key wells, the difference between the measurable objective and the minimum threshold is greater than 10 feet, which provides a margin of safety for operational flexibility in the Subbasin.

Until a monitoring well is installed in the EOPMA, the measurable objectives set for the wells closest to the EOPMA in the Saline Intrusion Management Area and the Oxnard Pumping Depression Management Area are presumed to also protect the EOPMA. The EOPMA has considerably less groundwater production than the adjoining management areas and does not have 1184
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-26
an independent suitable monitoring well for selecting a separate measurable objective. This presumption will be revisited as groundwater elevation data are collected from the EOPMA.

Interim Milestones for Land Subsidence
Interim milestones for land subsidence are presented for two climate scenarios in Table 3-2. The two sets of interim milestones were calculated from a linear interpolation between the fall 2015 low groundwater elevation and either the measurable objective or the minimum threshold at each key well. These interim milestones will be used to assess progress toward sustainable groundwater management in the Oxnard Subbasin between 2020 and 2040 as groundwater production from the Subbasin is reduced. The interim milestones for land subsidence are the same as the interim milestones for seawater intrusion.

3.5.6 Depletions of Interconnected Surface Water
The measurable objective for depletions of interconnected surface water is the groundwater level at which there is neither seawater flow into nor freshwater flow out of the UAS or LAS (Table 3-2).

This groundwater level is higher than the historical low water level in each key well. Therefore, it will protect against depletions of interconnected surface water related to groundwater withdrawal.

The measurable objective groundwater level was selected for each of the key wells based on the median predicted groundwater elevation between 2040 and 2070 from groundwater model simulations that minimized the migration of the 2015 saline water impact front after 2040. This groundwater level is the same groundwater level that is used to protect against seawater intrusion in the Subbasin. At each of the key wells, the difference between the measurable objective and the minimum threshold is greater than 10 feet, which provides a margin of safety for operational flexibility in the Subbasin.

Currently there is very little groundwater production from the semi-perched aquifer. If water levels in this aquifer rise as a result of reduced groundwater production in the underlying UAS, additional projects may investigate producing water from the semi-perched aquifer. Such projects will have to evaluate the potential impact to interconnected surface water and GDEs as part of the feasibility and permitting process. Additionally, if projects that produce groundwater from the semi-perched aquifer are implemented, the need for specific water-level measurable objectives in the semiperched aquifer should be reevaluated.

Until a monitoring well is installed in the EOPMA, the measurable objectives set for the wells closest to the EOPMA in the Oxnard Pumping Depression Management Area are presumed to also protect the EOPMA. The EOPMA has considerably less groundwater production than the Oxnard Pumping Depression Management Area and does not have an independent suitable monitoring well for selecting a separate measurable objective. This presumption will be revisited as groundwater elevation data are collected from the EOPMA. 1185
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-27
Interim Milestones for Depletions of Interconnected Surface Water Interim milestones for depletions of interconnected surface water are presented for two climate scenarios in Table 3-2. The two sets of interim milestones were calculated from a linear interpolation between the fall 2015 low groundwater elevation and either the measurable objective or the minimum threshold at each key well. These interim milestones will be used to assess progress toward sustainable groundwater management in the Oxnard Subbasin between 2020 and 2040 as groundwater production from the Subbasin is reduced. The interim milestones for interconnected surface water are the same as the interim milestones for seawater intrusion.

3.6 REFERENCES CITED
23 CCR (California Code of Regulations), Section 354.28(c)(5). Definition of the minimum threshold for land subsidence.

DWR (California Department of Water Resources). 2014. Summary of Recent, Historical, and Estimated Potential for Future Land Subsidence in California. Accessed February 2017. http://www.water.ca.gov/groundwater/docs/Summary_of_Recent_Historical_Potential_S ubsidence_in_CA_Final_with_Appendix.pdf.

DWR. 2016. “Map of Basin Boundary Modifications.” Bulletin 118 Basins (2016 Edits) [GIS layer]. https://gis.water.ca.gov/app/bbat/.

Hanson, R.T., P. Martin, and K. Koczot. 2003. Simulation of Ground-Water/Surface-Water Flow in the Santa Clara-Calleguas Ground-Water Basin, Ventura County, California. U.S.

Geological Survey Water Resources Investigation Report 2002-4136.

Izbicki, J.A. 1991. “Chloride Sources in a California Coastal Aquifer.” In American Society of Civil Engineers Symposium on Groundwater in the Pacific Rim, 71–77. Honolulu:

American Society of Civil Engineers. Proceedings: July 22–26, 1991.

Izbicki, J.A. 1996. “Use of 
18O and D to Define Seawater Intrusion.” In North American Water Congress, edited by C.T. Bathala. Anaheim, California: New York American Society of Civil Engineers. Proceedings: June 23–28, 1996.

UWCD (United Water Conservation District). 2008. Nitrate Observations in the Oxnard Forebay and Vicinity, 1995–2006. Prepared by D. Detmer. Santa Paula, California:

UWCD. July 2008.

UWCD. 2016. Saline Intrusion Update, Oxnard Plain and Pleasant Valley Basins. United Water Conservation District Open-File Report 2016-04. October 2016. 1186
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-28
UWCD. 2018. United Water Conservation District Multiple Species Habitat Conservation Plan.

Administrative Draft. September 7, 2018. Accessed April 10, 2019. https://www.unitedwater.org/images/stories/Resource-Conservation/MSHCP%202018/ UWCD%20Multiple%20Species%20Habitat%20Conservation%20Plan%202018-09-07.pdf. 1187
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-29
Table 3-1
Minimum Threshold Groundwater Elevations by Well, Management Area, and Aquifer for Key Wells in the Oxnard Subbasin State Well Number Management Area Aquifer
Perforations
(ft bgs)
Top Perforations
(ft msl)
Bottom Perforations
(ft msl)
Historical Water Level Low
(ft msl) and Date Measured
2015 Spring Water Level
(ft msl) and Date Measured GSP Undesirable Result
Proposed Minimum
Threshold (ft msl)
01N21W32Q06S Saline Intrusion Management Area Oxnard 180–220 −172.7 −212.7 −25.8 11/22/1991 −12.7 March 2015 SWI, reduction in groundwater storage
2 01N22W20J08S Saline Intrusion Management Area Oxnard 155–195 −143.8 −183.8 −14.8 09/28/1991 −7.6 March 2015 SWI, reduction in groundwater storage
7 01N22W26J04S Saline Intrusion Management Area Oxnard 185–205 −170.2 −190.2 −28.3 10/26/1990 −14.3 March 2015 SWI, reduction in groundwater storage
2 01N22W27C03S Saline Intrusion Management Area Oxnard 175–195 −162.8 −182.8 −18.6 12/13/1990 −9.0 March 2015 SWI, reduction in groundwater storage
7 01N23W01C05S West Oxnard Plain Management Area Oxnard 120–145 −105.8 −130.8 −6.9 11/18/1991 1.2 March 2015 SWI, reduction in groundwater storage
7 02N22W36E06S West Oxnard Plain Management Area Oxnard 230–320 −211.7 −251.7 −25.0 10/28/2015 −15.3 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
12 01N21W32Q05S Saline Intrusion Management Area Mugu 330–370 −322.7 −362.7 −107.4 11/30/2015 −60.7 March 2015 SWI, reduction in groundwater storage
2 01N21W32Q07S Saline Intrusion Management Area Mugu 275–285 −268.2 −278.2 −72.5 11/30/2015 −41.2 March 2015 SWI, reduction in groundwater storage
2 01N22W20J07S Saline Intrusion Management Area Mugu 310–350 −298.8 −338.8 −16.5 11/13/1991 −10.7 March 2015 SWI, reduction in groundwater storage
7 01N22W26J03S Saline Intrusion Management Area Mugu 524–620 −509.2 −605.2 −52.6 10/26/1990 −33.1 March 2015 SWI, reduction in groundwater storage
2 01N22W27C02S Saline Intrusion Management Area Mugu 275–295 −262.8 −282.8 −27.3 12/13/1990 −14.3 March 2015 SWI, reduction in groundwater storage
7 02N21W07L06S Forebay Management Area Mugu 135–155 11.9 −8.1 −12.2 12/03/2015 8.3 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
25 02N22W23B07S Forebay Management Area Mugu 260–300 −150.2 −190.2 −40.8 12/15/1992 −20.7 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
15 02N22W36E05S West Oxnard Plain Management Area Mugu 360–420 −288.4 −348.4 −21.0 11/04/2015 −13.6 February 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
10 01N22W20J05S Saline Intrusion Management Area Hueneme 640–680 −628.8 −668.8 −29.9 11/30/2015 −19.9 March 2015 SWI, reduction in groundwater storage
2 01N23W01C03S West Oxnard Plain Management Area Hueneme 965–1,065 −950.8 −1,050.8 −39.7 01/07/1991 −23.2 March 2015 SWI, reduction in groundwater storage
7 01N23W01C04S West Oxnard Plain Management Area Hueneme 630–695 −615.8 −680.8 −34.9 01/07/1991 −20.0 March 2015 SWI, reduction in groundwater storage
7 02N22W23B04S Forebay Management Area Hueneme 1,110–1,150 −1,000.2 −1,040.2 −147.1 10/28/2014 −75.6 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
−5
02N22W23B05S Forebay Management Area Hueneme 830–870 −720.2 −760.2 −121.0 10/12/1991 −65.5 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
−5
1188
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-30
Table 3-1
Minimum Threshold Groundwater Elevations by Well, Management Area, and Aquifer for Key Wells in the Oxnard Subbasin State Well Number Management Area Aquifer
Perforations
(ft bgs)
Top Perforations
(ft msl)
Bottom Perforations
(ft msl)
Historical Water Level Low
(ft msl) and Date Measured
2015 Spring Water Level
(ft msl) and Date Measured GSP Undesirable Result
Proposed Minimum
Threshold (ft msl)
02N22W23B06S Forebay Management Area Hueneme 460–500 −350.2 −390.2 −41.7 02/03/1993 −23.2 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
15 02N22W36E03S West Oxnard Plain Management Area Hueneme 195–285 −123.1 −213.1 −51.8 12/03/2014 −30.5 June 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
10 02N22W36E04S West Oxnard Plain Management Area Hueneme 130–170 −58.9 −98.9 −32.11 11/04/2015 −32.1 November 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
10 01N21W32Q04S Saline Intrusion Management Area FCA 600–640 −592.7 −632.7 −116.9 11/30/2015 −66.3 March 2015 SWI, reduction in groundwater storage
−23
01N22W20J04S Saline Intrusion Management Area FCA 870–930 −858.8 −918.8 −40.7 11/30/2015 −28.1 March 2015 SWI, reduction in groundwater storage
2 01N22W26K03S Saline Intrusion Management Area FCA 470–580 −456.9 −566.9 −71.8 06/16/2015 −65.6 March 2015 SWI, reduction in groundwater storage
−18
01N23W01C02S West Oxnard Plain Management Area FCA 1,390–1,490 −1,375.8 −1,475.8 −50.4 01/07/1991 −29.3 March 2015 SWI, reduction in groundwater storage
7 02N21W07L04S Forebay Management Area FCA 500–540 −353.1 −393.1 −32.0 10/14/2015 3.9 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
15 02N22W23B03S Forebay Management Area FCA 1,210–1,250 −1,100.2 −1,140.2 −128.7 02/28/1991 −77.0 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
−5
01N21W32Q02S Saline Intrusion Management Area GCA 930–970 −922.7 −962.7 −115.2 11/30/2015 −64.7 March 2015 SWI, reduction in groundwater storage
−23
01N21W32Q03S Saline Intrusion Management Area GCA 800–840 −792.7 −832.7 −125.8 11/30/2015 −75.6 March 2015 SWI, reduction in groundwater storage
−23
01N21W07J02S Oxnard Pumping Depression Management
Area
Multiple 590–1,280 −555.4 −1,245.4 −145.4 10/21/2014 −96.2 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
−40
01N21W21H02S Oxnard Pumping Depression Management
Area
Multiple 503–863 −484.3 −844.3 −149.4 10/20/2014 −101.1 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
−70
02N21W07L03S Forebay Management Area Multiple 640–700 −493.1 −553.1 −24.6 10/15/2015 1.8 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
15 02N21W07L05S Forebay Management Area Multiple 270–310 −1,23.1 −163.1 −7.4 12/30/2015 20.5 March 2015 SWI, reduction in groundwater storage, chronic
lowering of WL, subsidence
25 Notes: FCA = Fox Canyon Aquifer; ft bgs = feet below ground surface; ft msl = feet mean sea level; GCA = Grimes Canyon Aquifer; GSP = Groundwater Sustainability Plan; SWI = seawater intrusion; WL = water level.

Interim milestones are proposed for wells with spring 2015 groundwater elevations that are lower than the minimum threshold groundwater elevation. Wells with spring 2015 groundwater elevations that are higher than the minimum threshold are currently in compliance with the goals of this GSP and do not require milestones to assess progress toward sustainability.
1189
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-31
Table 3-2
Measurable Objectives and Interim Milestones
Well Number Aquifer
Minimum
Threshold
(ft msl)
Measurable
Objective
(ft msl)
Fall 2015 Water Level Low
(ft msl) and Date Measured
Interim Milestone
Average Climate
(ft msl)
Interim Milestone
Dry Climate
(ft msl)
2025 2030a 2035a 2040a 2025 2030a 2035a 2040a
01N21W32Q06S Oxnard 2 17 −23.12 11/30/2015 −15 −5 6 17 −18 −11 −4 2 01N22W20J08S Oxnard 7 17 -14.56 11/2/2015 −7 1 9 17 −10 −5 1 7 01N22W26J04S Oxnard 2 17 −23.31 10/16/2015 −15 −5 6 17 −18 −11 −4 2 01N22W27C03S Oxnard 7 17 −14.83 10/6/2015 −7 1 9 17 −10 −5 1 7 01N23W01C05S Oxnard 7 17 −1.94 11/2/2015 4 8 12 17 2 4 6 7 02N22W36E06S Oxnard 12 37 −25.03 10/28/2015 −10 6 22 37 −16 −7 2 12 01N21W32Q05S Mugu 2 17 −107.36 11/2/2015 −78 −46 −14 17 −82 −54 −26 2 01N21W32Q07S Mugu 2 17 −72.50 11/30/2015 −52 −29 −6 17 −56 −37 −18 2 01N22W20J07S Mugu 7 17 −16.21 11/2/2015 −7 1 9 17 −10 −5 1 7 01N22W26J03S Mugu 2 17 −44.39 10/16/2015 −30 −15 1 17 −33 −21 −9 2 01N22W27C02S Mugu 7 17 −22.57 10/6/2015 −15 −5 6 17 −17 −9 −1 7 02N21W07L06S Mugu 27 62 −12.21 12/3/2015 8 26 44 62 −1 8 17 27 02N22W23B07S Mugu 17 47 −31.59 12/30/2015 −11 8 27 47 −18 −6 6 17 02N22W36E05S Mugu 12 37 −21.01 11/4/2015 −6 8 22 37 −12 −4 4 12 01N22W20J05S Hueneme 2 17 −29.87 11/30/2015 −18 −6 6 17 −22 −14 −6 2 01N23W01C03S Hueneme 7 22 −32.26 11/30/2015 −17 −4 9 22 −21 −12 −3 7 01N23W01C04S Hueneme 7 22 −28.36 11/4/2015 −17 −4 9 22 −21 −12 −3 7 02N22W23B04S Hueneme −3 17 −95.68 12/3/2015 −67 −39 −11 17 −72 −49 −26 −3 02N22W23B05S Hueneme −3 17 −83.59 12/3/2015 −60 −35 −10 16 −65 −45 −25 −4 02N22W23B06S Hueneme 17 47 −37.35 12/3/2015 −15 6 27 47 −22 −9 4 17 02N22W36E03S Hueneme 12 37 −51.77 12/3/2014 −28 −6 16 37 −35 −20 −5 11 02N22W36E04S Hueneme 12 37 −32.12 11/4/2015 −13 4 21 37 −20 −10 1 12 01N21W32Q04S FCA −23 2 –116.94 11/30/2015 −86 −57 −28 2 −92 −69 −46 −23 01N22W20J04S FCA 2 17 –40.72 11/30/2015 42 34 26 17 38 26 14 2 01N22W26K03S FCA −18 2 –71.84 6/16/2015 −52 −34 −16 2 −57 −44 −31 −18 01N23W01C02S FCA 7 22 –37.63 11/30/2015 −25 −10 6 22 −28 −16 −4 7 02N21W07L04S FCA 17 42 –32.02 10/14/2015 −12 6 24 42 −18 −6 6 17 02N22W23B03S FCA −3 17 –94.26 12/3/2015 −67 −39 −11 17 −72 −49 −26 −3 01N21W32Q02S GCA −23 2 –115.19 11/30/2015 −86 −57 −28 2 −92 −69 −46 −23 1190
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-32
Table 3-2
Measurable Objectives and Interim Milestones
Well Number Aquifer
Minimum
Threshold
(ft msl)
Measurable
Objective
(ft msl)
Fall 2015 Water Level Low
(ft msl) and Date Measured
Interim Milestone
Average Climate
(ft msl)
Interim Milestone
Dry Climate
(ft msl)
2025 2030a 2035a 2040a 2025 2030a 2035a 2040a
01N21W32Q03S GCA −23 2 –125.76 11/30/2015 −93 −61 −29 2 −100 −75 −50 −24 01N21W07J02S Multiple −38 2 –140.02 10/25/2015 −105 −70 −35 1 −115 −90 −65 −39 01N21W21H02S Multiple −68 -8 –137.09 9/30/2015 −103 −71 −39 −7 −118 −101 −84 −67 02N21W07L03S Multiple 17 37 –24.59 10/15/2015 −10 6 22 37 −15 −5 6 17 02N21W07L05S Multiple 27 57 –7.41 12/30/2015 11 27 43 58 3 11 19 27 Notes: FCA = Fox Canyon Aquifer; ft msl = feet mean sea level; GCA = Grimes Canyon Aquifer. a
Interim milestones for 2030, 2035, and 2040 will depend on climate conditions and Subbasin water level recoveries between 2020 and 2025. These thresholds are proposed for the current GSP but will be reviewed and revised with each 5-year evaluation. 1191
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Central Ave
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Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\Oxnard Aquifer WLE_withMTMO_2019.03.7.mxd 02 1 n Miles
FIGURE 3-1
Minimum Thresholds and Groundwater Elevation Contours in the Oxnard Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
East Oxnard Plain Management Area (EOPMA)
Forebay Management Area
West Oxnard Plain Management Area (WOPMA)
Oxnard Pumping Depression Management Area
Saline Intrusion Management Area
East Pleasant Valley Management Area (EPVMA)
Pleasant Valley Pumping Depression
Management Area
North Pleasant Valley Management Area
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated State
Well Number (SWN). SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) All elevation values are in feet above mean sea
level (ft AMSL).
3) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation (feet
amsl) of groundwater. Dashed where approximate;
queried where inferred.

Legend
15P01 Abbreviated State Well Number (see notes)
") Key Wells screened in the Oxnard Aquifer
) Wells screened in the Oxnard Aquifer
15P01
5 Minimum Threshold for Key Wells in Feet
above mean sea level (AMSL)
1192
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-34

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Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\Mugu Aquifer WLE_withMTMO_2019.06.03.mxd 02 1 n Miles
FIGURE 3-2
Minimum Thresholds and Groundwater Elevation Contours in the Mugu Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
East Oxnard Plain Management Area (EOPMA)
Forebay Management Area
West Oxnard Plain Management Area (WOPMA)
Oxnard Pumping Depression Management Area
Saline Intrusion Management Area
East Pleasant Valley Management Area (EPVMA)
Pleasant Valley Pumping Depression
Management Area
North Pleasant Valley Management Area
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated State
Well Number (SWN). SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) All elevation values are in feet above mean sea
level (ft AMSL).
3) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation (feet
amsl) of groundwater. Dashed where approximate;
queried where inferred.

Legend
15P01 Abbreviated State Well Number (see notes)
XW Key Wells screened in the Mugu Aquifer
W Well screened in the Mugu Aquifer
15P01
5 Minimum Threshold for Key Wells in Feet
above mean sea level (AMSL)
1194
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-36

INTENTIONALLY LEFT BLANK
1195
?
? ?
? ?
?
?
?
*
*
*
*
*
* *
*
*
**
*
*
* *
**
!.
!.
!.
#* !.
#*
!.
#*
#*
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis
Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon S lough
C onejo Creek
C all eguas Cree k
Arro yo Con e jo
Santa Clara River
0 -20
-40
-60
-40
-60
-20
-80
-100
03R01
19A01
26M03
18H13
19J03
22Q05
29D02
(-31.98)
36E02
(-30.56)
03F05
16D04
20M02 20M03
28G03
29D03
31P03
31P06
12N03
26B03
36E08
T02N
T01N
T01S
R20W
R23W
R22W R21W
02P01
-43 04K01
07J02 -48
-38
21H02
-68
20J05
2 01C03
7 01C04
7 07L03
17 07L05
27 23B04
-3
23B05
-3
23B06
17 36E03
36E04 12
12 Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Cama r illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\Hueneme Aquifer WLE_withMTMO_2019.06.03.mxd 02 1 n Miles
FIGURE 3-3
Minimum Thresholds and Groundwater Elevation Contours in the Hueneme Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
East Oxnard Plain Management Area (EOPMA)
Forebay Management Area
West Oxnard Plain Management Area (WOPMA)
Oxnard Pumping Depression Management Area
Saline Intrusion Management Area
East Pleasant Valley Management Area (EPVMA)
Pleasant Valley Pumping Depression
Management Area
North Pleasant Valley Management Area
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated State
Well Number (SWN). SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) All elevation values are in feet above mean sea
level (ft AMSL).
3) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation (feet
amsl) of groundwater. Dashed where approximate;
queried where inferred.

Legend
15P01 Abbreviated State Well Number (see notes)
#* Key Wells screened in the Hueneme Aquifer
!. Key Wells screened in Multiple Aquifers
* Well screened in the Hueneme aquifer
15P01
5 Minimum Threshold for Key Wells in Feet
above mean sea level (AMSL)
1196
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-38

INTENTIONALLY LEFT BLANK
1197
?
? ?
? ?
?
?
?
?
?
?
(
(
(
(
(
(
( (
(
( (
(
(
(
(
(
(
( (
(
((
(
(
(
(
(
( (
(
(
(
(
(
((
(
((
(
(
(
(
(
(( (
(
(
(
(
(
((
(((( (
(
(
Z[
Z[
Z[
Z[
Z[
Z[
Z[
Z[
Z[
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis
Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Con e jo
Santa Clara Riv er
26K04
01E02
03B01
03K03
04B01
09F01
09Q07
09R01
01L01
11A02
11A03 12H01
16N03
17F05 18H10
18H14
29L04
34C01
34K01
36Q01
09D02
16J01
35P02
06J05
09C04
19L10
31A05 31A06
32K01
20M01
28G02
29D01
35E02 35E03 36K06 36K07
01H02
07K02 08H02
01A01
01E03
02D02
03H01
03J01
06R01
07R02
08B01 10D02
10G01
10J01
29B02
08L02
08L03
11J03
13A01
20A01
32E01
33R02
35J01 35R01
35R02
35R03
36P01
T02N
T01N
T01S
R20W
R23W
R22W R21W
-20
-40
-100
-140
-60
-80
-60
-80
-100
-120
-100
-120
-40
-80
-140
0 -40
-80
03C01
-48
32Q04
-23
20J04
2 26K03
-18
01C02
7 19M05
-135
07L04
17 34G02
-53
34G03
-53
23B03
-3
Simi-Santa
Rosa Fault
Camarillo
Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Cama r illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\Fox Canyon Aquifer WLE_withMTMO_2019.06.03.mxd 02 1 n Miles
FIGURE 3-4
Minimum Thresholds and Groundwater Elevation Contours in the Fox Canyon Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
East Oxnard Plain Management Area (EOPMA)
Forebay Management Area
West Oxnard Plain Management Area (WOPMA)
Oxnard Pumping Depression Management Area
Saline Intrusion Management Area
East Pleasant Valley Management Area (EPVMA)
Pleasant Valley Pumping Depression
Management Area
North Pleasant Valley Management Area
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated State
Well Number (SWN). SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) All elevation values are in feet above mean sea
level (ft AMSL).
3) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation (feet
amsl) of groundwater. Dashed where approximate;
queried where inferred.

Legend
15P01 Abbreviated State Well Number (see notes)
Z[ Key Wells screened in the Fox Canyon Aquifer
( Well screened in the Fox Canyon aquifer
15P01
5 Minimum Threshold for Key Wells in Feet
above mean sea level (AMSL)
1198
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-40

INTENTIONALLY LEFT BLANK
1199
+
+ +
+
+
+
+
$+
?23
232 ?
126 ?
?34
?1
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Thousand Oaks
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Simi
Arro yoSanta R osa
Arr oyoLas Posas
Revolon
Sl ough
C onejo Creek
C all eguas Cree k
Arro yo Con e jo
Santa Clara Riv er
-40
-60
-100
-80
22A01
28G01
35E01 36K05
08L03
22G01
28A02
T02N
T01N
T01S
R20W
R23W
R22W R21W
32Q02
32Q03 -23
-23
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mountclef
Ridge
Cama r illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\Grimes Canyon Aquifer WLE_withMTMO_2019.06.03.mxd 02 1 n Miles
FIGURE 3-5
Minimum Thresholds and Groundwater Elevation Contours in the Grimes Canyon Aquifer, October 2-29, 2015 Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
East Oxnard Plain Management Area (EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
:230$

Oxnard Pumping Depression Management Area
Saline Intrusion Management
East Pleasant Valley Management Area (EPVMA)
Pleasant Valley Pumping Depression
Management Area
North Pleasant Valley Management
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Arroyo Santa Rosa Valley (4-007)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated State
Well Number (SWN). SWNs are based on Township
and Range in the Public Land Survey System. To
construct a full SWN from the abbreviation shown
on the map, concatenate the Township, Range,
abbreviation, and the letter "S". Example: the
SWN for the well labeled "15L01" located in
Township 02N (T02N) and Range 22W (R22W) is
02N22W15L01S. Geotracker wells do not have
SWN IDs and so are not labeled.
2) All elevation values are in feet above mean sea
level (ft AMSL).
3) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Approximate contour of equal elevation (feet
amsl) of groundwater. Dashed where approximate;
queried where inferred.

Legend
15P01 Abbreviated State Well Number (see notes)
$+ Key Wells screened in the Grimes Canyon Aquifer
+ Well screened in the Grimes Canyon aquifer
15P01
5 Minimum Threshold for Key Wells in Feet
above mean sea level (AMSL)
1200
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-42

INTENTIONALLY LEFT BLANK
1201
-30
-25-20-15-10
-5
05 10152025
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
-25-20-15-10
-5
05 1015202530
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
-40-30-20-10
0 102030
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
Jan-2070
Historical Water LevelWƌŽũĞĐƚƐ^ŝŵƵůĂƟŽŶͲϮϳ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞh^͖ϭϯ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞ>^EŽWƌŽũĞĐƚƐ^ŝŵƵůĂƟŽŶͲϮϳ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞh^͖ϭϮ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞ>^DŝŶŝŵƵŵdŚƌĞƐŚŽůĚtĂƚĞƌ>ĞǀĞůDĞĂƐƵƌĂďůĞKďũĞĐƟǀĞtĂƚĞƌ>ĞǀĞů 'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
01N21W32Q06S 01N22W20J08S
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
01N22W26J04S
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
FIGURE 3-a
Key Well Hydrographs for Wells Screened in the Oxnard Aquifer Groundwater Sustainability Plan for the Oxnard Subbasin 1202
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-44

INTENTIONALLY LEFT BLANK
1203
-25
-20-15-10
-5
05 1015202530
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
01N22W27C03S
-20-10
0 10203040
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
-40-20
0 20406080
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
01N23W01C05S
01N222W36E06S
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ ,ŝƐƚŽƌŝĐĂůtĂƚĞƌ>ĞǀĞů WƌŽũĞĐƚƐ^ŝŵƵůĂƟŽŶͲϮϳ͕ϬϬϬ&z WƌŽĚƵĐƟŽŶŝŶƚŚĞh^͖ϭϯ͕ϬϬϬ&z WƌŽĚƵĐƟŽŶŝŶƚŚĞ>^ EŽWƌŽũĞĐƚƐ^ŝŵƵůĂƟŽŶͲϮϳ͕ϬϬϬ&z WƌŽĚƵĐƟŽŶŝŶƚŚĞh^͖ϭϮ͕ϬϬϬ&z WƌŽĚƵĐƟŽŶŝŶƚŚĞ>^ DŝŶŝŵƵŵdŚƌĞƐŚŽůĚtĂƚĞƌ>ĞǀĞůDĞĂƐƵƌĂďůĞKďũĞĐƟǀĞtĂƚĞƌ>ĞǀĞů FIGURE 3-b
Key Well Hydrographs for Wells Screened in the Oxnard Aquifer Groundwater Sustainability Plan for the Oxnard Subbasin 1204
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-46

INTENTIONALLY LEFT BLANK
1205
-120
-100
-80-60-40-20
0 2040
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
-100
-80-60-40-20
0 2040
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
-30-20-10
0 102030
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
-60-50-40-30-20-10
0 10203040
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
,ŝƐƚŽƌŝĐĂůtĂƚĞƌ>ĞǀĞů
WƌŽũĞĐƚƐ^ŝŵƵůĂƟŽŶͲϮϳ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞh^͖ϭϯ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞ>^ EŽWƌŽũĞĐƚƐ^ŝŵƵůĂƟŽŶͲϮϳ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞh^͖ϭϮ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞ>^ DŝŶŝŵƵŵdŚƌĞƐŚŽůĚtĂƚĞƌ>ĞǀĞů DĞĂƐƵƌĂďůĞKďũĞĐƟǀĞtĂƚĞƌ>ĞǀĞů ϬϭEϮϭtϯϮYϬϱ^ ϬϭEϮϭtϯϮYϬϳ^ϬϭEϮϮtϮϬ:Ϭϳ^ ϬϭEϮϮtϮϲ:Ϭϯ^
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
FIGURE 3-a
Key Well Hydrographs for Wells Screened in the Mugu Aquifer Groundwater Sustainability Plan for the Oxnard Subbasin 1206
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-48

INTENTIONALLY LEFT BLANK
1207
-30
-20-10
0 102030
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
-50
0 50
100150200
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
-60-40-20
0 20406080
100120
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
-60-40-20
0 20406080
100120
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
Jan-2050
Jan-2060
Jan-2070
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
,ŝƐƚŽƌŝĐĂůtĂƚĞƌ>ĞǀĞů
WƌŽũĞĐƚƐ^ŝŵƵůĂƟŽŶͲϮϳ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞh^͖ϭϯ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞ>^ EŽWƌŽũĞĐƚƐ^ŝŵƵůĂƟŽŶͲϮϳ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞh^͖ϭϮ͕ϬϬϬ&zWƌŽĚƵĐƟŽŶŝŶƚŚĞ>^ DŝŶŝŵƵŵdŚƌĞƐŚŽůĚtĂƚĞƌ>ĞǀĞů DĞĂƐƵƌĂďůĞKďũĞĐƟǀĞtĂƚĞƌ>ĞǀĞů ϬϭEϮϮtϮϳϬϮ^ ϬϮEϮϭtϬϳ>Ϭϲ^ϬϮEϮϮtϮϯϬϳ^ ϬϮEϮϮtϯϲ
Ϭϱ^
'ƌŽƵŶĚǁĂƚĞƌ
ůĞǀĂƟŽŶ;ŌD^>Ϳ
FIGURE 3-b
Key Well Hydrographs for Wells Screened in the Mugu Aquifer Groundwater Sustainability Plan for the Oxnard Subbasin 1208
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-50

INTENTIONALLY LEFT BLANK
1209
-40
-30-20-10
0 10203040
Jan-1980
Jan-1990
Jan-2000
Jan-2010
Jan-2020
Jan-2030
Jan-2040
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'ƌŽƵŶĚǁĂƚĞƌ
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FIGURE 3-a
Key Well Hydrographs for Wells Screened in the Hueneme Aquifer Groundwater Sustainability Plan for the Oxnard Subbasin 1210
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-52

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FIGURE 3-b
Key Well Hydrographs for Wells Screened in the Hueneme Aquifer Groundwater Sustainability Plan for the Oxnard Subbasin 1212
3 – SUSTAINABLE MANAGEMENT CRITERIA
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-54

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ϬϭEϮϮtϮϲ<Ϭϯ^
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FIGURE 3-
a
Key Well Hydrographs for Wells Screened in the Fox Canyon Aquifer Groundwater Sustainability Plan for the Oxnard Subbasin 1214
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-56

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FIGURE 3-
b
Key Well Hydrographs for Wells Screened in the Fox Canyon Aquifer Groundwater Sustainability Plan for the Oxnard Subbasin 1216
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-58

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FIGURE 3-1
Key Well Hydrographs for Wells Screened in the Grimes Canyon Aquifer Groundwater Sustainability Plan for the Oxnard Subbasin 1218
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-60

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FIGURE 3-1
Key Well Hydrographs for Wells Screened in Multiple Aquifers Groundwater Sustainability Plan for the Oxnard Subbasin 1220
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-62

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2020 2025 2030 2035 2040
Groundwater ElevaƟon (Ō MSL)
Interim Milestone for Average Climate CondiƟons
Interim Milestone for Dry Climate CondiƟons
DĞĂƐƵƌĂďůĞKďũĞĐƟǀĞ
Minimum Threshold
Path Toward Sustainability: ǀĞƌĂŐĞůŝŵĂƚĞŽŶĚŝƟŽŶƐ Path Toward Sustainability: ƌLJůŝŵĂƚĞŽŶĚŝƟŽŶƐ ŝīĞƌĞŶĐĞ/ŶϮϬϮϱ͗ ~6 feet FIGURE 3-1
Interim Milestones for Dry and Average Conditions - Linear Interpolation Groundwater Sustainability Plan for the Oxnard Subbasin 1222
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-64

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Count
WĞƌĐĞŶƚŽĨϱͲzĞĂƌǀĞƌĂŐĞWƌĞĐŝƉŝƚĂƟŽŶĨŽƌƚŚĞKdžŶĂƌĚWůĂŝŶ FIGURE 3-1
Distribution of 5-Year Average Climate Conditions in the Historical Record of Precipitation on the Oxnard Plain Groundwater Sustainability Plan for the Oxnard Subbasin 1224
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 3-66

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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-1
CHAPTER 4

MONITORING NETWORKS

4.1 MONITORING NETWORK OBJECTIVES
The overall objective of the monitoring network in the Oxnard Subbasin (Subbasin) is to track and monitor parameters that demonstrate progress toward meeting the sustainability goals. In order to accomplish this objective, the monitoring network in the Subbasin must be capable of the following:
 Monitoring changes in groundwater conditions (in six sustainability indicator categories)  Monitoring progress toward minimum thresholds and measurable objectives  Quantifying annual changes in water budget components The existing network of groundwater wells includes both monitoring wells and production wells.

This network is capable of delineating the groundwater conditions in the Subbasin and has been used for this purpose in the past. The current groundwater well network will be used to monitor groundwater conditions moving forward, in order to continue to assess long-term trends in groundwater elevation and groundwater quality in the Subbasin.

In the future, to the extent possible, additional dedicated monitoring wells will be incorporated into the existing monitoring network. These wells will provide information on groundwater conditions in geographic locations where data gaps have been identified, or where a dedicated monitoring well would better represent conditions in the aquifers than a production well currently used for monitoring.

4.2 DESCRIPTION OF EXISTING MONITORING NETWORK
The existing monitoring network for groundwater and related surface conditions in the Subbasin includes groundwater production wells, dedicated groundwater monitoring wells, stream gauges, and weather stations. The components of the monitoring network are discussed in Section 4.2.1, Groundwater Monitoring, and Section 4.2.2, Surface Conditions Monitoring, in the context of their ability to demonstrate short-term, seasonal, and long-term trends in groundwater and related surface conditions and of the ability of the network to provide representative conditions in the Subbasin. A discussion of how the monitoring network relates to each of the sustainability criteria follows this discussion in Section 4.3, Monitoring Network Relationship to Sustainability Indicators.
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-2

4.2.1 Groundwater Monitoring
Groundwater Elevation
Data collected from more than 150 wells in the Subbasin have been used to demonstrate historical groundwater elevation conditions in the Upper Aquifer System and Lower Aquifer System (Figures 4-1 through 4-6, Monitoring Wells Screened in the Oxnard Subbasin (by aquifer)). The groundwater well monitoring network contains wells that are located in every management area of the Subbasin except the East Oxnard Plain Management Area (EOPMA) and that are screened in every primary aquifer in the Subbasin. Although the network of groundwater wells includes agricultural, municipal and industrial, and domestic production wells, the majority of the wells used to determine groundwater elevations are designated as monitoring wells in the Ventura County Watershed Protection District (VCWPD) database of groundwater elevation and groundwater quality data collected in the Subbasin.

The United Water Conservation District (UWCD) collects groundwater elevation data from more than 100 monitoring and agricultural wells in the Subbasin. These wells are monitored either monthly or bimonthly (once every two months). Water levels are measured both manually and with pressure transducers, which record the pressure of water (or height of the water column) above the transducer in the well. Pressure transducers have been installed in 65 of these wells.

These transducers record the height of the water column in the well every 4 hours, thereby providing high temporal resolution data on groundwater conditions in the aquifers. Data are downloaded from the transducers quarterly, in a rotating pattern. Transducer records are subject to quality control review before being added to UWCD databases and reported to VCWPD.

Manual groundwater elevation measurements are collected monthly or bimonthly from the UWCD network of groundwater wells. These data are used to assess seasonal and long-term trends in groundwater elevation in the Subbasin, where groundwater elevations were first measured in the 1930s. Seasonal and long-term groundwater elevation trends have been assessed based on the data collected from the existing network of groundwater monitoring wells, and are discussed in Section

2.3, Groundwater Conditions, of this Groundwater Sustainability Plan (GSP).

The spatial and temporal coverage of the existing groundwater monitoring network is sufficient to provide an understanding of representative conditions in the Upper Aquifer System and Lower Aquifer System throughout the Subbasin, and this network will be used to demonstrate progress toward the sustainability goals for the Subbasin. Although evaluation of the current network suggests that the network is sufficient to document groundwater conditions in the Subbasin, areas for future improvement of the network are identified in Section 4.6, Potential Monitoring Network Improvements.
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-3
Groundwater Quality
The majority of the wells in the groundwater elevation monitoring network in the Subbasin are also monitored for groundwater quality. UWCD conducts the majority of the water quality monitoring in the Subbasin. UWCD water quality monitoring is conducted in a rotating pattern such that each well is monitored at least once per year. Annual monitoring of groundwater quality is sufficient to demonstrate long-term trends in groundwater quality, because the physical processes that drive changes in groundwater quality operate on a longer timescale. Currently, groundwater elevations are the primary metric by which progress toward sustainability will be measured. However, groundwater quality data will continue to be collected and analyzed to assess whether groundwater elevation thresholds are sufficiently protective of groundwater conditions in the Subbasin. Recommendations for improvement of the groundwater quality monitoring network are identified in Section 4.6.

Groundwater Extraction
The Fox Canyon Groundwater Management Agency (FCGMA) has required reporting of groundwater extraction from the Subbasin since 1983. Historically, groundwater extraction data from wells within the FCGMA jurisdictional boundary have been self-reported by well ownerssemiannually (Figure 2-5, Upper Aquifer System 2015 Extraction [acre-feet] in Oxnard and Pleasant Valley, and Figure 2-6, Lower Aquifer System 2015 Extraction [acre-feet] in Oxnard and Pleasant Valley). In 2018, FCGMA adopted an ordinance that required installation of advanced metering infrastructure (AMI) telemetry on wells that were equipped with flowmeters (FCGMA 2018). All agricultural wells were required to install AMI by December 31, 2018; municipal and industrial wells are required to install AMI by October 1, 2019; and all other metered wells are required to install AMI by October 1, 2020. Requiring AMI on all metered wells within FCGMA jurisdiction will provide for broader simultaneous reporting of groundwater extractions, improve FCGMA’s ability to monitor and manage groundwater use, and facilitate implementation of this GSP.

4.2.2 Surface Conditions Monitoring
The primary surface conditions that impact groundwater conditions in the Oxnard Subbasin are surface water flows and precipitation. The monitoring networks for both surface conditions are discussed in this section.

Surface Water
Surface flows in the Subbasin are monitored by a network of gauges that are maintained by the VCWPD (Table 4-1). The network includes three types of gauges:

1. Recording Stream Gauges (also known as Daily and Peak Stations). These stream gauges record daily average flowrates as well as “peak” flowrates during rain events. 1228
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-4

2. Peak Only (Event) Gauges. This type of stream gauge records only “peak” flowrates during rain events (the threshold over which a flowrate is considered to be part of a rain event is site-specific).

3. ALERT Peak Gauges. These stream gauges serve only as a flood warning system. These stations register high flows but are not used to measure numerical flow rates.

The recording stations at the Freeman Diversion Channel near Saticoy, Santa Clara River at Victoria Avenue, Beardsley Wash at Central Avenue, and the Revolon Slough at Pleasant Valley Road are recording gauges that provide the primary data on surface flows. These gauges collect daily data, while the other gauges in the basin only record flows during precipitation events.

In addition to the surface flow monitoring network in the Subbasin, UWCD monitors and reports diversions from the Santa Clara River. These diversions are used to deliver surface water to agricultural users in lieu of groundwater production and are used for recharge, via UWCD’s spreading grounds, to the groundwater aquifers in the Subbasin.

Surface water flows have been recorded in the Subbasin since the 1930s (Figure 1-4, Average Daily Flows (ADF) and Monthly Minimum ADF in Oxnard Surface Waters). Daily flows on Calleguas Creek and in the Revolon Slough have been recorded since the 1970s. There are currently gauges on the major surface water bodies in the Subbasin (Figure 4-7, Active Surface Water Monitoring Network for the Oxnard Subbasin). The historical and existing spatial and temporal coverage from the surface water flow gauge network provides adequate coverage for the short-term, seasonal, and long-term surface flow conditions in the Subbasin. Although the current network is sufficient to document surface flow conditions in the Subbasin, areas for improvement are identified in Section 4.6.

Precipitation
Thirteen precipitation gauges currently monitor precipitation in the Subbasin (Table 4-2; Figure 4- 8, Active Precipitation Monitoring Network for the Oxnard Subbasin). The precipitation gauges are maintained, and data are collected, by VCWPD and the National Weather Service.

Precipitation in the Subbasin has been recorded for more than a century (Figure 1-5, Oxnard Plain Annual Precipitation). Although the locations of individual precipitation gauges have changed through time, with some gauges being removed from service and others added, there is overlap between the records collected from the various gauges. Therefore, a continuous precipitation record can be constructed for the Subbasin to demonstrate long-term trends. More recent data, collected with greater frequency, can be used to demonstrate short-term and seasonal trends in precipitation.
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In addition to providing adequate temporal coverage of the Subbasin, the current network of precipitation gauges includes sites in every management area of the Subbasin except the EOPMA.

This is sufficient spatial coverage to document precipitation in the Subbasin and to connect the precipitation measurements to both streamflow and groundwater conditions. Additional precipitation monitoring locations are not currently recommended for characterizing surface conditions in the Oxnard Subbasin.

4.3 MONITORING NETWORK RELATIONSHIP TO

SUSTAINABILITY INDICATORS
To document changes in groundwater conditions related to each of the six sustainability indicators, monitoring will be conducted using the existing network of groundwater wells (Figures 4-1 through 4-6). This network includes a greater number of wells than the list of key wells provided in Chapter 3, Sustainable Management Criteria, of this GSP (see Tables 4-3 and 4-4). Minimum thresholds and measurable objectives have been selected for the set of key wells but have not been selected for every well used to monitor groundwater conditions in the Subbasin. Conditions measured in the key wells will be used to document progress toward the sustainability goals.

Groundwater conditions measured in the broader network of wells, which includes the key wells, will be used to document conditions in the Subbasin at a greater spatial coverage than is provided by the key wells. Recommendations and findings based on the key well data will be supported by the data collected by the broader well network.

4.3.1 Chronic Lowering of Groundwater Levels
To monitor conditions related to chronic lowering of groundwater levels, the groundwater monitoring network must be structured to accomplish the following:
 Track short-term, seasonal, and long-term trends in water elevation.  Demonstrate groundwater elevations in mid-March and mid-October for each primary aquifer or aquifer system.
 Record groundwater elevations in key wells in which minimum thresholds and measurable objectives have been identified to track progress toward the sustainability goals for the Subbasin.

Spatial Coverage by Aquifer
The Subbasin monitoring well density for groundwater elevations varies by aquifer (Tables 4-3 and 4-4). Of the primary aquifers in the Subbasin identified in Chapter 2, Basin Setting, the Grimes Canyon Aquifer has the lowest density of active wells in which groundwater elevations can be measured. The density of wells in the Grimes Canyon Aquifer is approximately 1 well per 13 square 1230
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miles (the Oxnard Subbasin area is approximately 90 square miles). There is no definitive rule for the density of groundwater monitoring points needed in a basin; however, for comparison, the monitoring well density recommended by CASGEM Groundwater Elevation Monitoring Guidelines ranges from 1 to 10 wells per 100 square miles (DWR 2010). Additional California Department of Water Resources (DWR) guidelines recommend a well network with a density of 1 observation per 16 square miles (DWR 2010, 2016b). Therefore, the density of wells in the Grimes Canyon Aquifer meets the criteria for adequate coverage to accomplish the objectives of the monitoring well network for determining chronic lowering of groundwater levels.

In addition to the Grimes Canyon Aquifer, the density of wells in the other primary aquifers in the Subbasin is also greater than the recommended well density provided in the DWR and CASGEM guidelines. The density of active monitoring wells in the Fox Canyon Aquifer (FCA) and the Hueneme Aquifer is approximately 1 well per 4 square miles. The density of active monitoring wells in the Mugu Aquifer is approximately 1 well per 3 square miles, and the density of active monitoring wells in the Oxnard Aquifer is approximately 1 well per square mile.

Groundwater elevations are also monitored in the semi-perched aquifer, although the semi-perched aquifer is not a primary aquifer in the Subbasin. These elevations are measured to document interactions between the semi-perched aquifer and the surface water bodies in the Subbasin, as well as to document potential gradients between the semi-perched aquifer and the underlying Oxnard Aquifer. The density of monitoring wells in the semi-perched aquifer is approximately 1 well per 13 square miles. This density meets the DWR and CASGEM criteria for documenting groundwater elevations in the semi-perched aquifer.

Although the active network of wells used to document chronic lowering of groundwater levels in the Subbasin has sufficient spatial density on the Subbasin scale, in some aquifers, there are local areas in which coverage can be improved. Potential improvements in local coverage are discussed in Section 4.6.

Temporal Coverage by Aquifer
Groundwater elevation data will be collected from the network of groundwater wells to provide groundwater elevation conditions in the spring and fall of each year. Further discussion of the monitoring schedule is provided in Section 4.4, Monitoring Network Implementation. 1231
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4.3.2 Reduction of Groundwater Storage
To monitor conditions related to reduction of groundwater storage, the groundwater monitoring network must be structured to accomplish the following:
 Demonstrate groundwater elevations in mid-March and mid-October for each primary aquifer or aquifer system.
 Calculate year-over-year (mid-March to mid-March) change in storage by aquifer.  Provide data from which lateral and vertical hydraulic gradients within and between aquifers can be calculated.
 Record groundwater elevations in key wells in which minimum thresholds and measurable objectives have been identified to track progress toward the sustainability goals for the Subbasin.

The requirements for documenting reduction in groundwater storage are similar to those for chronic lowering of groundwater levels (see Section 4.3.1), because these two sustainability indicators are interrelated. The primary difference between the two sets of requirements is the need to document potential gradients between aquifers. These gradients influence the movement of water between aquifers, which in turn influences storage in the aquifer.

Historically, the change in groundwater stored in freshwater aquifers in the Subbasin has been modeled by UWCD. After GSP adoption, modeled volumes of annual change in storage will be reported by aquifer and by year in annual reports. A standardized method to calculate the change in storage that relies solely on water elevations within each aquifer, rather than on a numerical model, may also be developed as a check on the model predictions.

The spatial and temporal density of groundwater elevation data necessary to document groundwater storage changes in the aquifers of the Subbasin is the same as that necessary to document groundwater elevation changes. The current network of wells is capable of documenting changes to both sustainability indicators. Specific recommendations for potential improvements to local coverage are discussed in Section 4.6.

4.3.3 Seawater Intrusion
To monitor conditions related to seawater intrusion, groundwater elevations will be measured, and water quality samples will be collected, in such a way as to accomplish the following:
 Track short-term, seasonal, and long-term trends in water elevation.  Demonstrate groundwater elevations in mid-March and mid-October for each primary aquifer or aquifer system.
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 Record groundwater elevations in key wells in which minimum thresholds and measurable objectives have been identified to track progress toward the sustainability goals for the Subbasin.

These goals are the same as those for chronic lowering of groundwater levels (see Section

4.3.1). Groundwater elevations are the metric by which seawater intrusion will be assessed (see Section 3.3.3).

Spatial Coverage by Aquifer
A network of nested monitoring wells was installed in the early 1990s by the U.S. Geological Survey for the Regional Aquifer System Analysis, which includes 16 wells in the Oxnard Subbasin (USGS 1996). Fourteen of these well sites are located within an approximately 28-square-mile area adjacent to the Pacific Ocean. Thus, the density of dedicated monitoring wells adjacent to the coast is approximately 1 well per 2 square miles. The current network of wells is capable of documenting groundwater elevations that could induce seawater intrusion. No additional coastal monitoring wells are proposed.

Water Quality Constituents
Groundwater samples will continue to be collected and analyzed for total dissolved solids (TDS) and chloride in order to assess trends in groundwater quality related to seawater intrusion. The network of existing wells is capable of providing an adequate assessment of groundwater quality trends for these constituents.

Temporal Resolution
Historically, groundwater quality samples have been collected with sufficient temporal resolution to identify seawater intrusion in the aquifers of the Subbasin (see Section 2.3.3, Seawater Intrusion, of this GSP). The temporal resolution of the data has varied through time and depends on the entity monitoring a given well. UWCD has collected annual groundwater samples from the network of monitoring wells along the Subbasin coastline since the late 1980s (UWCD 2016). These samples have documented long-term trends in chloride concentration for the coastal wells. Because the degradation of water quality associated with seawater intrusion is a process that occurs over a longer time than changes in groundwater elevation associated with groundwater production, annual groundwater quality sampling is adequate for documenting changes in chloride and TDS concentration associated with seawater intrusion.
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4.3.4 Degraded Water Quality
To monitor conditions related to degraded water quality, water quality samples will be collected in such a way as to track long-term trends in water quality that may impact beneficial uses and users of groundwater in the Subbasin. Specifically, these water quality samples should be targeted to constituents of concern and areas of the Subbasin that have documented degradation, or the potential for degradation, in water quality related to groundwater production from the Subbasin.

Spatial Coverage by Aquifer
The network of wells currently used to monitor groundwater elevation conditions in each aquifer is sufficient to determine trends in groundwater quality as well. The primary areas of concern for groundwater quality degradation relating to groundwater elevations in the Subbasin are the Forebay Management Area, the Saline Intrusion Management Area, and the Oxnard Pumping Depression Management Area. Monitoring groundwater quality changes associated with seawater intrusion is discussed in Section 4.3.3. The spatial density of groundwater elevation monitoring wells is discussed in Section 4.3.1. The spatial coverage provided by the existing monitoring network is sufficient to document changes in groundwater quality.

Water Quality Constituents
Monitoring and annual reporting has occurred for constituents that are associated with a water quality threshold adopted by the FCGMA Board of Directors or by the Los Angeles Regional Water Quality Control Board. These constituents are TDS, chloride, nitrate, sulfate, and boron.

The network of existing wells is capable of providing an adequate assessment of groundwater quality trends for these constituents.

Temporal Resolution
Degradation of groundwater quality occurs on a longer timescale than changes in groundwater elevation. Historically, UWCD has collected water quality samples on a quarterly basis and VCWPD has collected samples annually, although more frequent sampling can occur in some wells. These samples have provided information on trends in groundwater quality throughout the Subbasin. Samples from coastal wells have been used to document seawater intrusion, and samples from wells in the Oxnard Forebay have been used to document degradation of water quality related to increasing nitrate concentrations (see Section 2.3). The temporal resolution of the data collection is adequate to document trends in groundwater concentration for the constituents identified by the FCGMA Board of Directors and the Los Angeles Regional Water Quality Control Board.
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4.3.5 Land Subsidence
To monitor conditions related to land subsidence, groundwater elevations will be measured to determine if water levels fall below historical lows. Groundwater elevations are being used as a proxy for land subsidence in the Subbasin. The minimum thresholds identified at the key wells are above the historical low groundwater elevation. Therefore, it is not anticipated that specific land subsidence monitoring will be required for the Subbasin. Instead, the network of groundwater monitoring wells discussed in Sections 4.2.1 and 4.3.1 will be used to determine if land subsidence related to groundwater production may occur.

4.3.6 Depletions of Interconnected Surface Water
To monitor conditions related to depletions of interconnected surface water, surface water flows and shallow groundwater will be measured in such a way as to accomplish the following:
 Track short-term, seasonal, and long-term trends in groundwater elevation in the semiperched aquifer.  Demonstrate groundwater elevations in mid-March and mid-October for the semiperched aquifer.  Record groundwater elevations in key wells in which minimum thresholds and measurable objectives have been identified to track progress toward the sustainability goals for the Subbasin.

Surface water flows in the Revolon Slough, Calleguas Creek, and the Santa Clara River downstream of, but not including, the Freeman Diversion are connected to water levels in the semiperched aquifer, rather than the underlying confined aquifers of the Upper Aquifer System and Lower Aquifer System. In turn, the groundwater elevation in the semi-perched aquifer is effectively regulated by the height of the agricultural tile drains installed throughout the Oxnard Plain (UWCD 2016).

Although the active network of wells used to document groundwater conditions in the semi-perched aquifer has sufficient spatial density at the Subbasin scale, there are local areas in which coverage can be improved. Potential improvements in local coverage are discussed in Section 4.6.

4.4 MONITORING NETWORK IMPLEMENTATION

4.4.1 Groundwater Elevation Monitoring Schedule
To reduce uncertainty associated with hydraulic gradients, and to follow guidance documents produced by DWR (DWR 2016b), water level measurements used in the evaluation of seasonal high 1235
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and seasonal low groundwater conditions should be collected in a 2-week window in mid-March and mid-October (specifically, March 9–22 and October 9–22 of any given calendar year).

Short-term trends in groundwater elevation are currently, and will continue to be, monitored using transducers that are operated and maintained by UWCD. Data from these transducers are downloaded quarterly and stored in a central database.

Seasonal and long-term trends in groundwater elevation are monitored using the transducer data and manual measurements made by UWCD on a monthly or bimonthly basis, and manual measurements made by VCWPD on a quarterly basis. Additional manual water level measurements made by other partner agencies (e.g., the City of Oxnard or mutual water districts) are typically sent to VCWPD annually.

4.4.2 Groundwater Storage Monitoring Schedule
Groundwater storage is directly related to, and calculated from, groundwater elevations.

Consequently, the schedule for monitoring groundwater storage is the same as that for monitoring groundwater elevations.

4.4.3 Seawater Intrusion Monitoring Schedule
Groundwater Elevation
Twice-yearly comprehensive evaluations (in mid-March and mid-October) of groundwater elevations in each aquifer will be used to assess progress toward minimum thresholds designed to avoid seawater intrusion.

Groundwater Quality
Annual groundwater quality samples for each coastal well will be used to monitor water quality trends related to seawater intrusion.

4.4.4 Water Quality Monitoring Schedule
UWCD conducts monthly or quarterly monitoring of groundwater quality in many wells throughout the Oxnard Subbasin. Wells with stable water quality are sampled annually or twice annually by UWCD. Groundwater quality monitoring should continue on the same schedule in order to document groundwater quality trends in the Subbasin. Annual reviews of the groundwater quality trends will be used to assess whether sampling frequency or the spatial density of samples needs to be adjusted.
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4.4.5 Groundwater Extraction Monitoring Schedule
Monitoring of groundwater extraction rates will take place continuously, using flowmeters and telemetry equipment installed on individual wellheads, and monthly totals of pumped water will be transmitted to a central database maintained by FCGMA.

4.5 PROTOCOLS FOR DATA COLLECTION AND MONITORING
Protocols for collecting groundwater level measurements and water quality samples, as well as downloading transducers and logging the boreholes of newly drilled wells, are included in the Monitoring Protocols Best Management Practices (BMPs) produced by DWR (DWR 2016a).

FCGMA plans to work with agency partners to ensure that future data collection is conducted according to relevant protocols in the BMP. Current practices used by VCWPD and UWCD are described in this section.

VCWPD Protocols
VCWPD technicians collect water levels using steel tapes. For a well that is too deep for the tape, an acoustical sounder or an air pressure gauge is used, and the measurement is stored in the database with a Questionable Measurement Code, indicating that alternate equipment was used.

VCWPD technicians collect water quality samples from production wells using the installed pump equipment. A three-volume purge, or a testing of groundwater parameters including pH, temperature, and electrical conductivity, is conducted to determine whether the water at the wellhead is representative of groundwater in the aquifer. Water quality samples are then sent to an analytical laboratory, where they are filtered and preserved.

UWCD Protocols
UWCD technicians collect water levels using a variety of equipment, including dual-wire and single-wire sounders and metal tapes. In the event that the well contains a pump, the technician manually tests the approximate temperature of the pump housing. If the pump housing is warm, the water level that is entered into the database is qualified with a Questionable Measurement Code, indicating recent pumping. UWCD also considers other indicators, such as wet conditions at wells and in nearby fields, to evaluate if water levels may not be static.

UWCD technicians collect water quality samples using the three-volume purge method, and follow U.S. Geological Survey guidelines for groundwater quality sampling. For shallow wells, a Grundfos Redi-Flo pump is used to purge and sample the groundwater. For deeper wells, a compressor is used to airlift the groundwater for purging and sampling. On rare occasions, a bailer is used to purge and sample.
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4.6 POTENTIAL MONITORING NETWORK IMPROVEMENTS
The existing monitoring network in the Subbasin is sufficient to document groundwater conditions in the Subbasin, and can be used to document progress toward the sustainability goals for the Subbasin.

Analysis of the monitoring network, however, also indicates that there are local areas in which data coverage and monitoring efforts can be improved in the future. Areas for improvement of the existing monitoring network and data infrastructure system, are described in the following sections.

4.6.1 Water Level Measurements: Spatial Data Gaps
Additional monitoring wells could be used to improve spatial coverage for groundwater elevation measurements in the West Oxnard Plain Management Area, the Oxnard Pumping Depression Management Area, and the EOPMA. Wells that are added to the network should be dedicated monitoring well clusters, with individual wells in the cluster screened in a single aquifer. The potential improvements to the monitoring network in each aquifer are shown on Figures 4-9 through 4-14 (Existing and Potential New Wells for Monitoring Groundwater Conditions, by aquifer).

The groundwater monitoring network in the Subbasin could be improved by adding monitoring wells in the Oxnard Pumping Depression Management Area (Figures 4-9 through 4-14). An additional well, or wells, in this area would provide aquifer-specific groundwater elevations in an area that does not have local wells screened solely in the Mugu Aquifer or the Hueneme Aquifer, and does not have a dedicated monitoring well screened in any of the primary aquifers.

Groundwater elevation measurements in this well would help constrain groundwater gradients across the boundary between the Subbasin and the Pleasant Valley Basin. Additionally, a well in this management area could be used to assess groundwater conditions in the semi-perched aquifer adjacent to the Revolon Slough. FCGMA has applied for funding through a DWR Technical Support Services monitoring well funding grant to add a monitoring well in the Oxnard Pumping Depression Management Area.

In the West Oxnard Plain Management Area, the groundwater monitoring network could be improved by adding a monitoring well to the area north of Highway 101 and south of the Oxnard Forebay. Currently, there are no dedicated monitoring wells in this area (Figures 4-9 through 4- 14). Adding a monitoring well in this area would provide for aquifer-specific water levels adjacent to the West Las Posas Management Area boundary. These groundwater levels could be used to constrain the gradient between the West Las Posas Management Area and the Subbasin.

The monitoring network in the West Oxnard Plain Management Area could also be improved by adding a monitoring well to the area north of 6th Street and west of Ventura Road. This area has dedicated monitoring wells in the Oxnard Aquifer, but does not have a dedicated monitoring well in the Mugu or Hueneme Aquifer or the FCA. A monitoring well in this area would help constrain groundwater gradients in the northwest part of the Oxnard Subbasin. 1238
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There are currently no monitoring wells in the EOPMA, which has minimal known groundwater production. Addition of a monitoring well in the vicinity of Calleguas Creek in the EOPMA would improve understanding of groundwater conditions in this management area. It would also provide data to help constrain the relationship between groundwater elevations in the EOPMA and groundwater conditions in the adjacent Oxnard Pumping Depression and Saline Intrusion Management Areas.

New wells will be constructed to applicable well installation standards set in California DWR Bulletins 74-81 and 74-90, or as updated (DWR 2016b). It is recommended that, where feasible, new wells be subjected to pumping tests to collect additional information about aquifer properties in the vicinity of new monitoring locations.

Proposed locations are approximate and subject to feasibility review (accounting for infrastructure, site acquisition, and site access, among other factors) after GSP submittal. The schedule for new well installation will be developed in conjunction with feasibility review.

4.6.2 Water Level Measurements: Temporal Data Gap
The DWR Monitoring Protocol BMP (DWR 2016a) states the following:

Groundwater elevation data … should approximate conditions at a discrete period in time. Therefore, all groundwater levels in a basin should be collected within as short a time as possible, preferably within a 1 to 2 week period.

The DWR Monitoring Networks BMP (DWR 2016b) states the following:

Groundwater levels will be collected during the middle of October and March for comparative reporting purposes.

Currently, groundwater elevation measurements are not scheduled according to these criteria. To minimize the effects of this type of temporal data gap in the future, it will be necessary to coordinate the collection of groundwater elevation data so it occurs within a 2-week window during the key reporting periods of mid-March and mid-October. The recommended collection windows are October 9 to 22 in the fall and March 9 to 22 in the spring (see Section 4.4).

Additionally, as funding becomes available, pressure transducers should be added to wells in the groundwater monitoring network. Pressure transducer records provide the high temporal resolution data that allows for a better understanding of water level dynamics in the wells related to groundwater production, groundwater management activities, and climatic influence. 1239
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4.6.3 Groundwater Quality Monitoring
To improve the existing groundwater quality monitoring in the Subbasin, the current analyte list could be expanded to include a full general minerals suite. Stiff or Piper diagrams could then be created to fully characterize the geochemical characteristics of the groundwater and track changes over time. UWCD currently gets a general mineral analysis at least annually for most monitoring wells in the Oxnard Subbasin.

4.6.4 Subsidence Monitoring
Currently, neither FCGMA nor its partner agencies in the region monitor land subsidence. The U.S.

Geological Survey maintained one benchmark in the southern part of the Oxnard Plain between 1939 and 1978 (see Section 2.3.5, Subsidence, of this GSP), but it is not currently operational. Subsidence related to groundwater production is not anticipated to occur in the Subbasin in the future because the minimum threshold groundwater elevations are higher than the historical low groundwater elevations in the Subbasin. Preexisting GPS-based benchmarks could be used for monitoring land subsidence in the event that groundwater elevations drop below historical low levels for an extended period, and the potential for land subsidence to substantially interfere with surface land uses is determined (see Section 3.3.5, Land Subsidence). Additionally, historical InSAR and LIDAR records exist for the Oxnard Plain and could be used for comparison to future conditions if groundwater production causes water levels that are below the historical lows.

4.6.5 Shallow Groundwater Monitoring near Surface Water Bodies and GDEs
Currently, there are relatively few wells that can be used to monitor the shallow groundwater in the semi-perched aquifer that may be interconnected with surface water bodies and sustain GDEs or potential GDEs in the Subbasin. To improve the existing monitoring network and to assist with understanding the potential connectivity between shallow groundwater and potential GDEs, a dedicated shallow monitoring well within the boundaries of the potential GDE along the Revolon Slough and an additional dedicated shallow monitoring well in the vicinity of Lower Calleguas Creek could be added to the monitoring network, independent of an additional nested well cluster (Figure 2-52, Groundwater Dependent Ecosystems for the Oxnard Subbasin).

Additional shallow monitoring wells are not proposed for the coastal GDEs (Lower Santa Clara River, McGrath Lake, Ormond Beach, and Mugu Lagoon) described in Section 2.3.7, Groundwater-Dependent Ecosystems, of this GSP (see Figures 2-52 through 2-56). The coastal GDEs are sustained by groundwater in the semi-perched aquifer, which is rarely used for water supply in the Subbasin (FCGMA 2007). However, if future projects propose to produce water from the semi-perched aquifer, depletion of interconnected surface water is possible, and significant and unreasonable impacts may occur. Therefore, additional monitoring wells may be necessary and should be installed in conjunction with the planning for those projects. 1240
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4.6.6 Surface Water: Flows in Agricultural Drains in the Oxnard Plain
Discharge flows are currently unmeasured in the drainage system, frequently referred to as the “tile drains,” that was installed throughout the Oxnard Plain in the 1950s (Isherwood and Pillsbury 1958). The tile drains were installed to support the development of land in the Oxnard Plain, which was formerly affected by high soil salinity levels, for agriculture (Isherwood and Pillsbury 1958).

The drains are typically located 6 to 7 feet below ground surface, though the depth varies and is not well documented in most areas. Shallow groundwater entering the drains discharges to central drainage ditches, and from there flows into local surface waters, such as the Revolon Slough, or directly to the ocean, such as at Port Hueneme.

Metering flow in the tile drains would provide an important check on numerical groundwater results and would also provide valuable information about the water resource potential of the semiperched aquifer. The tile drain system is extensive, and in much of the Oxnard Plain its current state of repair is currently unknown. A feasibility study is recommended to identify the best locations in the drainage system for installing flowmeters.

4.7 REFERENCES CITED
County of Ventura. 2016. Shapefile data of wells in Ventura County. Ventura_County_Wells_ 08_17_2016.shp. Attachment to an email from Jeff Dorrington. August 17, 2016.

DWR (California Department of Water Resources). 2010. Department of Water Resources Groundwater Elevation Monitoring Guidelines. December 2010. http://www.water.ca.gov/ groundwater/casgem/pdfs/CASGEM%20DWR%20GW%20Guidelines%20Final% 20121510.pdf
DWR. 2016a. Best Management Practices for the Sustainable Management of Groundwater:

Monitoring Protocols, Standards, and Sites. December 2016.

DWR. 2016b. Best Management Practices for the Sustainable Management of Groundwater:

Monitoring Networks and Identification of Data Gaps. December 2016.

DWR. 2016c. Bulletin 118 Interim Update 2016: California’s Groundwater—Working Toward Sustainability. December 22, 2016. www.water.ca.gov/groundwater/bulletin118/index.cfm.

FCGMA (Fox Canyon Groundwater Management Agency). 2007. 2007 Update to the Fox Canyon Groundwater Management Agency Groundwater Management Plan. Prepared by FCGMA, United Water Conservation District, and Calleguas Municipal Water District. May 2007. 1241
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FCGMA. 2016. Minutes of the Fox Canyon Groundwater Management Agency regular Board meeting held Wednesday, May 25, 2016. Accessed November 2017. http://www.fcgma.org/public-documents/board-of-directors-meetings.

FCGMA. 2018. Fox Canyon Groundwater Management Agency Advanced Metering Infrastructure (AMI) Ordinance. Adopted February 28 2018.

Isherwood, J.D., and A.F. Pillsbury. 1958. “Shallow Ground Water and Tile Drainage in the Oxnard Plain.” Eos 39(6): 1101–1110.

USGS (U.S. Geological Survey). 1996. Lithologic and Ground-Water Data for Monitoring Wells in the Santa Clara–Calleguas Ground-Water Basin, Ventura County, California, 1989–

95. USGS Open-File Report 96-120. Prepared by J.N. Densmore in cooperation with the United Water Conservation District. Sacramento: USGS.

UWCD (United Water Conservation District). 2016. Saline Intrusion Update, Oxnard Plain and Pleasant Valley Basins. United Water Conservation District Open-File Report 2016-04.

October 2016.

VCWPD (Ventura County Watershed Protection District). 2016. [Ventura County Stream Gauge Locations – Figure 4-7.]
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INTENTIONALLY LEFT BLANK
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Table 4-1
Network of Stations Monitoring Surface Flows in the Vicinity of the Oxnard Subbasin Station
Number Station Name Latitude Longitude
Elevation
(ft msl) Station Type USGS ID
A639 Freeman Diversion Weir ALERT 34.299111 −119.108417 187 ALERT Stream Gauge
—
724A Santa Clara River at Freeman
Diversion (ALERT)

34.299222 −119.108 — ALERT Stream
Gauge
—
793 J Street Drain at Lagoon
(ALERT)

34.140944 −119.188028 15 ALERT Stream
Gauge
—
778 Nyeland Acres Drain 34.225099 −119.126788 46 Peak Only (Event) Gauge
—
779 Rice Rd Drain at Wooley Rd 34.189448 −119.151126 24 Peak Only (Event) Gauge
—
781 Santa Clara Drain 34.242678 −119.113763 79 Peak Only (Event) Gauge
—
719 Freeman Diversion Channel
near Saticoy

34.292778 −119.116389 — Recording Stream
Gauge
11113900
723 Santa Clara River at Victoria
Ave

34.234917 −119.216611 62 Recording Stream
Gauge
—
780 Beardsley Wash at Central Ave 34.2305 −119.112028 60 Recording Stream Gauge
—
776A Revolon Slough at Pleasant
Valley Rd

34.192592 −119.107875 20 Recording Stream
Gauge
—
Notes: ft msl = feet above mean sea level; USGS = U.S. Geological Survey.

This table shows results from active gauges only (as of August 2016).

Table 4-2
Network of Stations Monitoring Precipitation in the Vicinity of the Oxnard Subbasin Station Number Station Name Latitude Longitude
Elevation
(ft msl) Station Type USGS ID
273A Oxnard NWS 34.207207 −119.137384 63 National
Weather
Service Site
—
403 Silverstrand Alert (Type B) 34.15271 −119.218965 18 Non-Standard Recorder
—
017C Port Hueneme–Oxnard
Sewer Plant

34.141684 −119.18665 10 Recording
Precipitation
Gauge
—
032A Oxnard Civic Center 34.200087 −119.180278 53 Recording Precipitation
Gauge
46569
168 Oxnard Airport 34.201647 −119.207685 34 Recording
Precipitation
Gauge
—
1244
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-20
Table 4-2
Network of Stations Monitoring Precipitation in the Vicinity of the Oxnard Subbasin Station Number Station Name Latitude Longitude
Elevation
(ft msl) Station Type USGS ID
175A Saticoy–County Yard 34.281214 −119.141018 150 Recording Precipitation
Gauge
—
177A Camarillo–Pacific Sod 34.155471 −119.073003 20 Recording Precipitation
Gauge
—
215A Channel Is Harbor–Kiddie
Beach

34.158944 −119.222338 15 Recording
Precipitation
Gauge
—
239 El Rio–UWCD Spreading
Grounds

34.239405 −119.153009 105 Recording
Precipitation
Gauge
—
412 El Rio–Mesa School APCD 34.252361 −119.143056 131 Recording Precipitation
Gauge
—
223A Point Mugu–USN 34.112778 −119.119444 12 Standard
Precipitation
Midnight
—
215 Channel Islands Harbor 34.162042 −119.222717 5 Standard Precipitation
—
261 Saticoy–Recharge Facility 34.278889 −119.123056 145 Standard Precipitation
—
Notes: APCD = Air Pollution Control District; ft msl = feet above mean sea level; NWS = National Weather Service; USGS = U.S. Geological Survey; USN = U.S. Navy; UWCD = United Water Conservation District.

This table shows results from active gauges only.

Table 4-3
VCWPD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
by VCWPDa
Water
Quality
Samples
Collected
by VCWPDa
Water
Level
Sampling
Schedule
after GSP
Adoption
Water
Quality
Sampling
Schedule
after GSP
Adoption
01N21W04D04S Agricultural Multiple LAS — Yes Annual
01N21W04N02S Monitoring Multiple Unassigned Yes — —
01N21W06L04S Agricultural Oxnard UAS Yes — —
01N21W07H01S Agricultural Oxnard UAS Yes —
01N21W08R01S Agricultural Multiple LAS — Yes Annual
01N21W09C04S Agricultural FCA LAS Yes — —
01N21W16A04S Agricultural Multiple LAS Yes — —
01N21W16M01S Agricultural Multiple Both Yes — —
1245
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-21
Table 4-3
VCWPD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
by VCWPDa
Water
Quality
Samples
Collected
by VCWPDa
Water
Level
Sampling
Schedule
after GSP
Adoption
Water
Quality
Sampling
Schedule
after GSP
Adoption
01N21W16M03S Agricultural Multiple LAS — Yes Annual
01N21W16P03S Agricultural Multiple LAS Yes — —
01N21W17D02S Agricultural Oxnard UAS Yes — —
01N21W19J05S Agricultural Multiple LAS — Yes Annual
01N21W20K03S Agricultural Multiple LAS — Yes Annual
01N21W20N07S Domestic Multiple UAS Yes — —
01N21W21H02S Agricultural Multiple LAS — Yes Annual
01N21W21H03S Agricultural Unassigned LAS — Yes Annual
01N21W21K03S Agricultural Unassigned Both — Yes Annual
01N21W21N01S Agricultural Mugu UAS Yes — —
01N21W22C01S Agricultural Multiple LAS — Yes Annual
01N21W28D01S Agricultural Multiple LAS Yes Yes Annual
01N21W28G01S Agricultural Unassigned UAS — Yes Annual
01N21W28H03S Agricultural Unassigned Both — Yes Annual
01N21W29B03S Agricultural Multiple UAS Yes Yes Annual
01N21W32K01S Municipal FCA LAS Yes — —
01N22W03F05S Municipal Hueneme LAS — Yes Annual
01N22W03F07S Municipal Oxnard UAS — Yes Annual
01N22W06B01S Domestic Unassigned UAS — Yes Annual
01N22W12M01S Agricultural Unassigned UAS — Yes Annual
01N22W12N03S Agricultural Multiple LAS Yes — —
01N22W12R01S Agricultural Multiple LAS Yes — —
01N22W14K01S Agricultural Oxnard UAS Yes — —
01N22W16D04S Municipal Hueneme LAS — Yes Annual
01N22W19A01S Municipal Hueneme LAS — Yes Annual
01N22W21B03S Municipal Multiple LAS Yes — —
01N22W21B06S Municipal Multiple LAS — Yes Annual
01N22W23R02S Agricultural Unassigned LAS — Yes Annual
01N22W24B04S Agricultural Multiple LAS — Yes Annual
01N22W24C02S Agricultural Multiple UAS Yes — —
01N22W24C03S Agricultural Unassigned Both — Yes Annual
01N22W25K01S Agricultural Unassigned UAS — Yes Annual
01N22W25K02S Agricultural FCA LAS — Yes Annual
1246
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-22
Table 4-3
VCWPD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
by VCWPDa
Water
Quality
Samples
Collected
by VCWPDa
Water
Level
Sampling
Schedule
after GSP
Adoption
Water
Quality
Sampling
Schedule
after GSP
Adoption
01N22W26K03S Agricultural Multiple LAS Yes — Twice
yearly
—
01N22W26M03S Agricultural Hueneme LAS Yes Yes Annual
01N22W26P02S Agricultural Unassigned LAS — Yes Annual
01N22W26Q01S Agricultural Unassigned Both — Yes Annual
01N22W36B02S Agricultural Multiple LAS Yes — —
02N21W07P04S Agricultural Multiple LAS Yes Yes Annual
02N21W19A01S Domestic Multiple UAS — Yes Annual
02N21W19A03S Agricultural Multiple LAS Yes — —
02N21W19B02S Agricultural Oxnard UAS Yes — —
02N21W20F02S Domestic Multiple Unassigned Yes — —
02N21W20M03S Agricultural Multiple UAS — Yes Annual
02N21W20M06S Agricultural Multiple LAS Yes — —
02N21W31P02S Monitoring Multiple Unassigned Yes — —
02N21W31P03S Monitoring Hueneme LAS Yes — —
02N22W23H03S Agricultural Unassigned UAS — Yes Annual
02N22W24P01S Agricultural Mugu UAS Yes Yes Annual
02N22W24P02S Agricultural Multiple LAS — Yes Annual
02N22W24R02S Domestic Unassigned UAS — Yes Annual
02N22W25A02S Agricultural Unassigned UAS — Yes Annual
02N22W25F01S Industrial Unassigned UAS — Yes Annual
02N22W26E01S Municipal Multiple UAS Yes — —
02N22W27M02S Municipal Unassigned UAS — Yes Annual
02N22W30F03S Agricultural Unassigned LAS — Yes Annual
02N22W30K01S Agricultural Oxnard UAS Yes — —
02N22W31A01S Agricultural Multiple Unassigned Yes — —
02N22W31D02S Agricultural Unassigned UAS — Yes Annual
02N22W32C04S Agricultural Multiple UAS — Yes Annual
02N22W32Q03S Agricultural Multiple UAS Yes — Twice
yearly
—
02N22W36E02S Municipal Hueneme LAS — Yes Annual
02N22W36E03S Municipal Hueneme UAS — Yes Annual
02N22W36F01S Domestic Unassigned Unassigned — Yes Twice yearly
Annual
02N22W36F02S Agricultural Unassigned UAS — Yes Annual
1247
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-23
Table 4-3
VCWPD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
by VCWPDa
Water
Quality
Samples
Collected
by VCWPDa
Water
Level
Sampling
Schedule
after GSP
Adoption
Water
Quality
Sampling
Schedule
after GSP
Adoption
02N23W25G02S Industrial Multiple Unassigned Yes Yes Annual 02N23W25M01S Agricultural Unassigned UAS — Yes Annual
02N23W36C04S Domestic Oxnard UAS Yes — —
Notes: FCA = Fox Canyon Aquifer; GSP = Groundwater Sustainability Plan; LAS = Lower Aquifer System; UAS = Upper Aquifer System; VCWPD = Ventura County Watershed Protection District.
a As of October 2017.
1248
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-24
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
01N21W04D04S Agricultural Multiple LAS Yes Quarterly
01N21W06J05S Agricultural FCA LAS Yes
01N21W06R01S Monitoring Oxnard UAS Yes Quarterly
01N21W07J02S Agricultural Multiple LAS Yes Twice yearly 01N21W10G01S Agricultural Multiple LAS Yes Quarterly
01N21W12D01S Agricultural Multiple UAS Yes Bimonthly
01N21W15J04S Agricultural Multiple LAS Yes Yes Monthly
01N21W17C02S Agricultural Unassigned UAS Yes Quarterly
01N21W17G03S Agricultural Multiple LAS Yes Bimonthly
01N21W18A04S Agricultural Unassigned UAS Yes Yes Bimonthly 01N21W18L05S Agricultural Unassigned LAS Yes Quarterly
01N21W19C01S Agricultural Oxnard UAS Yes Bimonthly
01N21W19J05S Agricultural Multiple LAS Yes Bimonthly
01N21W19L10S Monitoring FCA LAS Yes Yes Yes Yes Monthly Quarterly 01N21W19L11S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Quarterly 01N21W19L12S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Quarterly 01N21W19L13S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Quarterly 01N21W19L14S Monitoring SemiPerchedSemiPerchedYes Yes Yes Yes Monthly Quarterly 01N21W20C05S Agricultural Mugu UAS Yes Bimonthly
01N21W20K03S Agricultural Multiple LAS Yes Bimonthly
01N21W21H02S Agricultural Multiple LAS Yes Quarterly
01N21W28D01S Agricultural Multiple LAS Yes Quarterly
01N21W28G04S Agricultural Multiple LAS Yes Bimonthly
1249
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-25
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
01N21W31A05S Monitoring FCA LAS Yes Yes Yes Bimonthly Quarterly 01N21W31A06S Monitoring FCA LAS Yes Yes Yes Bimonthly Quarterly 01N21W31A07S Monitoring Mugu UAS Yes Yes Yes Bimonthly Quarterly 01N21W31A08S Monitoring Oxnard UAS Yes Yes Yes Bimonthly Quarterly 01N21W31A09S Monitoring Oxnard UAS Yes Yes Bimonthly Quarterly 01N21W32Q02S Monitoring GCA LAS Yes Yes Yes Yes Monthly Quarterly 01N21W32Q03S Monitoring GCA LAS Yes Yes Yes Yes Monthly Quarterly 01N21W32Q04S Monitoring FCA LAS Yes Yes Yes Yes Monthly Quarterly 01N21W32Q05S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Quarterly 01N21W32Q06S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Quarterly 01N21W32Q07S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Quarterly 01N22W01M03S Agricultural Multiple LAS Yes Quarterly
01N22W02A02S Monitoring Mugu UAS Yes Yes Yes Monthly
01N22W03F05S Municipal Hueneme LAS Yes Quarterly
01N22W03F09S Monitoring Unassigned Unassigned Yes Yes Yes Monthly Twice yearly 01N22W03F11S Monitoring Unassigned Unassigned Yes Yes Yes Monthly Twice yearly 01N22W03F13S Municipal Oxnard UAS Yes Quarterly
01N22W11C03S Agricultural Unassigned Unassigned Yes Yes Monthly 01N22W13D03S Agricultural Multiple LAS Yes Quarterly
01N22W14R02S Oxnard UAS Yes Bimonthly
01N22W16D04S Municipal Hueneme LAS Yes Yes Monthly
01N22W17C03S Municipal Multiple LAS Yes Quarterly
01N22W18L02S Municipal Unassigned LAS Yes Bimonthly
1250
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-26
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
01N22W19A01S Municipal Hueneme LAS Yes Bimonthly
01N22W20J04S Monitoring FCA LAS Yes Yes Yes Yes Monthly Quarterly 01N22W20J05S Monitoring Hueneme LAS Yes Yes Yes Yes Monthly Quarterly 01N22W20J06S Monitoring Mugu–
Hueneme
LAS Yes Yes Yes Yes Monthly Quarterly
01N22W20J07S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Quarterly 01N22W20J08S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Quarterly 01N22W20M01S Monitoring FCA LAS Yes Yes Yes Bimonthly Quarterly 01N22W20M02S Monitoring Hueneme LAS Yes Yes Yes Bimonthly Quarterly 01N22W20M03S Monitoring Hueneme LAS Yes Yes Yes Bimonthly Quarterly 01N22W20M04S Monitoring Mugu UAS Yes Yes Yes Bimonthly Quarterly 01N22W20M05S Monitoring Oxnard UAS Yes Yes Yes Bimonthly Quarterly 01N22W20M06S Monitoring SemiPerchedSemiPerchedYes Yes Yes Bimonthly Quarterly 01N22W21B03S Municipal Multiple LAS Yes Bimonthly
01N22W21B06S Municipal Multiple LAS Yes Bimonthly
01N22W24B04S Agricultural Multiple LAS Yes Bimonthly
01N22W24C02S Agricultural Multiple UAS Yes Bimonthly
01N22W24M03S Agricultural Unassigned Both Yes Bimonthly 01N22W26J03S Monitoring Mugu UAS Yes Yes Bimonthly Quarterly 01N22W26J04S Monitoring Oxnard UAS Yes Yes Bimonthly Quarterly 01N22W26J05S Monitoring SemiPerched
SemiPerched
Yes Yes Bimonthly Quarterly
01N22W27C02S Monitoring Mugu UAS Yes Yes Bimonthly Quarterly 1251
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-27
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
01N22W27C03S Monitoring Oxnard UAS Yes Yes Bimonthly Quarterly 01N22W27C04S Monitoring SemiPerchedSemiPerchedYes Yes Bimonthly Quarterly 01N22W27R03S Monitoring Mugu UAS Yes Yes Bimonthly Quarterly 01N22W27R04S Monitoring Oxnard UAS Yes Yes Bimonthly Quarterly 01N22W27R05S Monitoring Oxnard UAS Yes Yes Bimonthly Quarterly 01N22W28G01S Monitoring GCA LAS Yes Yes Yes Monthly Quarterly 01N22W28G02S Monitoring FCA LAS Yes Yes Yes Monthly Quarterly 01N22W28G03S Monitoring Hueneme LAS Yes Yes Yes Monthly Quarterly 01N22W28G04S Monitoring Oxnard UAS Yes Yes Yes Monthly Quarterly 01N22W28G05S Monitoring Oxnard UAS Yes Yes Yes Monthly Quarterly 01N22W29D01S Monitoring FCA LAS Yes Yes Yes Bimonthly Quarterly 01N22W29D02S Monitoring Hueneme LAS Yes Yes Yes Bimonthly Quarterly 01N22W29D03S Monitoring Hueneme LAS Yes Yes Yes Bimonthly Quarterly 01N22W29D04S Monitoring Mugu UAS Yes Yes Yes Bimonthly Quarterly 01N22W35E01S Monitoring GCA LAS Yes Yes Yes Bimonthly Quarterly 01N22W35E02S Monitoring FCA LAS Yes Yes Yes Bimonthly Quarterly 01N22W35E03S Monitoring FCA LAS Yes Yes Yes Bimonthly Quarterly 01N22W35E04S Monitoring Mugu UAS Yes Yes Yes Bimonthly Quarterly 01N22W35E05S Monitoring Oxnard UAS Yes Yes Yes Bimonthly Quarterly 01N22W36K05S Monitoring GCA LAS Yes Yes Yes Yes Monthly Quarterly 01N22W36K06S Monitoring FCA LAS Yes Yes Yes Yes Monthly Quarterly 01N22W36K07S Monitoring FCA LAS Yes Yes Yes Yes Monthly Quarterly 01N22W36K08S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Quarterly 1252
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-28
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
01N22W36K09S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Quarterly 01N23W01C02S Monitoring FCA LAS Yes Yes Yes Yes Monthly Quarterly 01N23W01C03S Monitoring Hueneme LAS Yes Yes Yes Yes Monthly Quarterly 01N23W01C04S Monitoring Hueneme LAS Yes Yes Yes Yes Monthly Quarterly 01N23W01C05S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Quarterly 01S21W08L03S Monitoring GCA LAS Yes Yes Yes Bimonthly Quarterly 01S21W08L04S Monitoring Oxnard UAS Yes Yes Yes Bimonthly Quarterly 01S22W01H01S Monitoring Multiple LAS Yes Quarterly
01S22W01H02S Monitoring FCA LAS Yes Quarterly
01S22W01H03S Monitoring Mugu UAS Yes Quarterly
01S22W01H04S Monitoring Oxnard UAS Yes Quarterly
02N21W06P01S Agricultural Multiple Unassigned Yes Bimonthly 02N21W07F01S Agricultural Multiple UAS Yes Bimonthly
02N21W07L03S Monitoring Multiple Unassigned Yes Yes Yes Yes Monthly Twice yearly 02N21W07L04S Monitoring FCA LAS Yes Yes Yes Yes Monthly Twice yearly 02N21W07L05S Monitoring Multiple Unassigned Yes Yes Yes Yes Monthly Twice yearly 02N21W07L06S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Twice yearly 02N21W07L07S Municipal Multiple UAS Yes Bimonthly
02N21W07M04S Municipal Multiple UAS Yes Bimonthly Twice yearly 02N21W07N02S Agricultural Multiple LAS Yes Bimonthly
02N21W07P03S Agricultural Multiple LAS Yes Bimonthly
02N21W07P04S Agricultural Multiple LAS Yes Bimonthly
02N21W07Q01S Agricultural Multiple LAS Yes
1253
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-29
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
02N21W07R01S Monitoring Multiple LAS Yes Bimonthly
02N21W08D01S Monitoring Multiple Unassigned Yes Bimonthly 02N21W16J03S Agricultural Multiple LAS Yes Bimonthly
02N21W17F05S Agricultural FCA LAS Yes Bimonthly
02N21W18B01S Agricultural Multiple UAS Yes Yes Bimonthly Twice yearly 02N21W19P01S Agricultural Multiple LAS Yes Yes Bimonthly 02N21W20A02S Agricultural Unassigned Unassigned Yes Bimonthly 02N21W22G01S Municipal GCA LAS Yes Bimonthly
02N21W28A02S Municipal GCA LAS Yes Bimonthly
02N21W29L04S Agricultural Multiple LAS Yes Yes Monthly
02N21W29M02S Agricultural Unassigned Unassigned Yes Yes Monthly 02N21W30A01S Agricultural Unassigned LAS Yes Yes Monthly 02N21W31P06S Agricultural Hueneme LAS Yes Bimonthly
02N21W32E01S Agricultural Multiple LAS Yes Quarterly
02N21W34G02S Monitoring FCA LAS Yes Yes Yes Yes Monthly Twice yearly 02N21W34G03S Monitoring FCA LAS Yes Yes Yes Yes Monthly Twice yearly 02N21W34G04S Monitoring Hueneme LAS Yes Yes Yes Yes Monthly Twice yearly 02N21W34G05S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N21W34G06S Monitoring Unassigned Unassigned Yes Yes Yes Yes Monthly Twice yearly 02N22W01P02S Oxnard UAS Yes Yes Quarterly
02N22W01R02S Monitoring Multiple Unassigned Yes Yes Quarterly Twice yearly 02N22W02R05S Agriculture Multiple Both Yes Bimonthly
02N22W11G01S Oxnard UAS Yes Yes Quarterly
1254
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-30
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
02N22W11J01S Monitoring Multiple Unassigned Yes Yes Yes Bimonthly Twice yearly 02N22W11J02S Monitoring Oxnard UAS Yes Yes Quarterly Twice yearly 02N22W11Q01S Monitoring Oxnard UAS Yes Yes Yes Bimonthly Twice yearly 02N22W12A01S Monitoring Oxnard UAS Yes Yes Bimonthly
02N22W12A02S Agricultural Oxnard UAS Yes Bimonthly
02N22W12B08S Agricultural Multiple UAS Yes Yes Bimonthly 02N22W12E04S Industrial Multiple Both Yes Quarterly
02N22W12F03S Monitoring Oxnard UAS Yes Yes Quarterly Twice yearly 02N22W12F04S Monitoring Oxnard UAS Yes Yes Quarterly Twice yearly 02N22W12G03S Industrial Oxnard UAS Yes Bimonthly
02N22W12H01S Municipal Multiple UAS Yes Quarterly
02N22W12J02S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W12J04S Municipal Multiple UAS Yes Quarterly
02N22W12K05S Industrial Unassigned UAS Yes Quarterly
02N22W12N03S Agricultural Hueneme LAS Yes Bimonthly
02N22W12Q06S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W12R03S Agricultural Multiple Both Yes Bimonthly
02N22W12R04S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W12R05S Agricultural Unassigned Both Yes Bimonthly 02N22W13C01S Monitoring Oxnard UAS Yes Yes Quarterly Twice yearly 02N22W13N02S Municipal Multiple LAS Yes Quarterly
02N22W13N05S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W13N06S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 1255
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-31
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
02N22W13N07S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W14A09S Monitoring Oxnard UAS Yes Yes Yes Bimonthly Twice yearly 02N22W14B01S Agricultural Multiple LAS Yes Yes Monthly
02N22W14D01S Monitoring Oxnard UAS Yes Yes Quarterly Twice yearly 02N22W14F03S Monitoring Oxnard UAS Yes Yes Yes Bimonthly Twice yearly 02N22W14G04S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W14G05S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W14G06S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W14G07S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W14G08S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W14P02S Municipal Multiple UAS Yes Quarterly
02N22W14P03S Municipal Multiple UAS Yes Yes Bimonthly
02N22W15L01S Monitoring Oxnard UAS Yes Yes Quarterly Twice yearly 02N22W15P01S Monitoring Oxnard UAS Yes Yes Quarterly Twice yearly 02N22W15R02S Monitoring Oxnard UAS Yes Yes Quarterly Twice yearly 02N22W16R02S Monitoring Oxnard UAS Yes Yes Quarterly Twice yearly 02N22W22Q05S Municipal Multiple LAS Yes Yes Monthly
02N22W22R02S Municipal Multiple Unassigned Yes Yes Monthly 02N22W23B02S Municipal Multiple UAS Yes Quarterly
02N22W23B03S Monitoring FCA LAS Yes Yes Yes Yes Monthly Twice yearly 02N22W23B04S Monitoring Hueneme LAS Yes Yes Yes Yes Monthly Twice yearly 02N22W23B05S Monitoring Hueneme LAS Yes Yes Yes Yes Monthly Twice yearly 02N22W23B06S Monitoring Hueneme LAS Yes Yes Yes Yes Monthly Twice yearly 1256
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-32
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
02N22W23B07S Monitoring Mugu UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W23B08S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W23B09S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W23C02S Municipal Multiple UAS Yes Quarterly
02N22W23C05S Agricultural Multiple UAS Yes Yes Quarterly 02N22W23C06S Municipal Unassigned UAS Yes Quarterly
02N22W23D06S Agricultural Multiple UAS Yes Bimonthly
02N22W23G03S Municipal Multiple UAS Yes Quarterly
02N22W23G04S Municipal Multiple UAS Yes Quarterly
02N22W23H04S Municipal Multiple LAS Yes Quarterly
02N22W23H06S Monitoring Oxnard UAS Yes Yes Yes Yes Monthly Twice yearly 02N22W23K05S Municipal Multiple UAS Yes Quarterly
02N22W24A01S Agricultural Multiple UAS Yes Yes Bimonthly Twice yearly 02N22W24P02S Agricultural Multiple LAS Yes Bimonthly
02N22W25J01S Municipal Multiple LAS Yes Bimonthly
02N22W25L03S Municipal Multiple UAS Yes Quarterly
02N22W26B03S Municipal Hueneme LAS Yes Quarterly
02N22W26E01S Municipal Multiple UAS Yes Twice yearly
02N22W26H02S Agricultural Multiple LAS Yes Bimonthly
02N22W27A02S Municipal Unassigned Unassigned Yes Twice yearly 02N22W27A03S Municipal Unassigned Unassigned Yes Twice yearly 02N22W27K01S Municipal Unassigned UAS Yes Twice yearly
02N22W27L01S Municipal Unassigned UAS Yes Twice yearly
1257
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-33
Table 4-4
UWCD Monitoring Schedule of Wells in the Oxnard Subbasin State Well
Number (SWN) Main Use
Screened
Aquifer
Screened
Aquifer
System
Manual
Water
Levels
Monitored
Bimonthlya
Manual
Water
Levels
Monitored
Monthlya
Standard
Transducer
and Manual
Water
Levela
O&M
Transducer
and Manual
Water
Levela
Water
Quality
Samples
Collected
Monthly or
Quarterlya
Water Level
Sampling
Schedule
after GSP
Adoptiona,b
Water
Quality
Sampling
Schedule
after GSP
Adoptiona
02N22W27M02S Municipal Unassigned UAS Yes Twice yearly
02N22W28H02S Domestic Unassigned UAS Yes Twice yearly
02N22W30K01S Agricultural Oxnard UAS Yes Bimonthly
02N22W31A01S Agricultural Multiple Unassigned Yes Quarterly 02N22W32C04S Agricultural Multiple UAS Yes Bimonthly
02N22W36E04S Monitoring Hueneme LAS Twice yearly
02N22W36E05S Monitoring Mugu UAS Twice yearly
02N22W36E06S Monitoring Oxnard UAS Yes Twice yearly
02N22W36E07S Monitoring Mugu UAS Yes Twice yearly
02N22W36E08S Monitoring Hueneme LAS Yes Twice yearly
02N22W36M02S Monitoring Unassigned Unassigned Yes
Notes: FCA = Fox Canyon Aquifer; GCA = Grimes Canyon Aquifer; GSP = Groundwater Sustainability Plan; LAS = Lower Aquifer System; O&M = operations and maintenance; UAS = Upper Aquifer System; UWCD = United Water Conservation District.
a As of October 2017.
b Although sometimes used to mean twice a month (i.e., semimonthly), bimonthly as used here means once every 2 months. 1258
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-34

INTENTIONALLY LEFT BLANK
1259
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis
Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
19L14
20M06
26J05
27C04
29D03
29F06 29L03
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-1. existing Monitoring wells Semi-Perched.mxd 02 1 n Miles
FIGURE 4-1
Monitoring Wells Screened in the Semi-Perched Aquifer in the Oxnard Subbasin Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
^_ Existing monitoring well screened in
the semi-perched aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
1260
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-36

INTENTIONALLY LEFT BLANK
1261
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa C lara River
T02N
T01N
T01S
R20W
R23W
R22W R21W
06L04
06R01
07H01
17D02
19C01
19K10 19L12 19L13
31A08
31A09
32Q06
03F07
03F08
03F12
03F13
03F14
11B01
14K01
14R02
20J08
20M05
26J04
27C03
27R05 27R04
28G05 28G04
35E05 36K09
01C05
08L04
08L05
01H04
19B02
11J02
11Q01
12A01
12A02 12F03
12F04 12G03
12J02
12Q06 12R01 12R04
13C01
13N06 13N07
14A09 14D01
14F03
14G06 14G07
14G08
15L01
15P01 15R02
16R02
23B08 23B09
23H06
30A05
30C04
30K01
30K04
34K02
36E05
36E06
36C04
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-2. existing Monitoring wells Oxnard.mxd 02 1 n Miles
FIGURE 4-2
Monitoring Wells Screened in the Oxnard Aquifer in the Oxnard Subbasin Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
") Monitoring well screened in the
Oxnard Aquifer
) Non-monitoring well screened in the
Oxnard Aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
1262
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-38

INTENTIONALLY LEFT BLANK
1263
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
19L11
20C05
21N01
31A07
32Q07 32Q05
02A02
06R02
20M04 20J07
26J03
27C02
27R03
29D04
35E04 36K08
01H03
07L06
13N05
14G04
14G05
14H04
23B07
24P01
36E07 36E04
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-3. existing Monitoring wells Mugu.mxd 02 1 n Miles
FIGURE 4-3
Monitoring Wells Screened in the Mugu Aquifer in the Oxnard Subbasin Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
XW Monitoring well screened in the
Mugu Aquifer
W Non-monitoring well screened in the
Mugu Aquifer
Oxnard Subbasin Management
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management
15P01 Abbreviated State Well Number (see notes)
1264
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-40

INTENTIONALLY LEFT BLANK
1265
*
*
*
*
*#
*#
*# *
*#
*#
*
*#*
*
*
*#
*
**#
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
03F05
03R01
16D04
19A01
20J05
20M02
20M03
28G03 26M03
29D03 29D02
01C03
01C04
18H13
31P03
31P06
12N03
19J03 23B04
23B05
23B06
26B03
36E02 36E03
36E08
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-4. existing Monitoring wells Hueneme.mxd 02 1 n Miles
FIGURE 4-4
Monitoring Wells Screened in the Hueneme Aquifer in the Oxnard Subbasin Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasin (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
*# Monitoring well screened in the
Hueneme Aquifer
* Non-monitoring well screened in the
Hueneme Aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
1266
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-42

INTENTIONALLY LEFT BLANK
1267
(
(
!(
(
(
!(
(
!(
!(
!(
(
(
(
!(
!(
!( !(
!(
!(
!(
!(
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
06J05
09C04
19L10
30A02
30L01
31A05 31A06
32K01
32Q04
20J04
20M01
25B04
25K02
26H02
28G02
29D01
35E02 35E03 36K06 36K07
01C02
01H02
07L04
23B03
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-5. existing Monitoring wells Fox.mxd 02 1 n Miles
FIGURE 4-5
Monitoring Wells Screened in the Fox Canyon Aquifer in the Oxnard Subbasin Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
!( Monitoring well screened in the Fox
Canyon Aquifer
( Non-monitoring well screened in the
Fox Canyon Aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
1268
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-44

INTENTIONALLY LEFT BLANK
1269
+
$+
$+
$+ $+
$+
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
19P03
32Q03 32Q02
28G01
35E01 36K05
08L03
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-6. existing Monitoring wells Grimes.mxd 02 1 n Miles
FIGURE 4-6
Monitoring Wells Screened in the Grimes Canyon Aquifer in the Oxnard Subbasin Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
$+ Monitoring well screened in the
Grimes Canyon Aquifer
+ Non-monitoring well screened in the
Grimes Canyon Aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
1270
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-46

INTENTIONALLY LEFT BLANK
1271
)
017
017A
017B
017C
032 032A 168
177
177A
215
215A
223
223A
231
231A
239
257
261
267
273A
403
412
503
Pacific Ocean
232 ?
126 ?
118 ?
?34
?1
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Conejo Creek
Arroyo Las Posas
Calleguas Creek
Revolon Slough
Santa Clara River
Santa Monica Mountains
700
719
723
731A 724A
732
776A
777
778
779
780
781
793
800A
805
835 806A
A639
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Freeman
Diversion
Brad el yRd
Price Rd
Aggen Rd
Cam arill o Hills
Active Surface Water Monitoring Network for the Oxnard Subbasin Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; VCWPD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-7. Active Surface Water Monitoring Network for the Oxnard Subbasin.mxd FIGURE 4-7
Ventura County Gauge Locations (VCWPD
2016; labeled by station number)
Recording Stream Gauge
Peak Only (Event) Site
ALERT Stream Gauge
Ventura County Rivers, Streams and Channels (VCWPD
2016)
) Freeman Diversion
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area (EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
:230$

Oxnard Pumping Depression Management Area
Saline Intrusion Management
Fox Canyon Groundwater Management Agency Boundary
(FCGMA 2016)
Revised Bulletin 118 Groundwater Basins and
Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02) 0123 0.5 n Miles
1272
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-48

INTENTIONALLY LEFT BLANK
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)
")
")
Pacific Ocean
232 ?
126 ?
118 ?
?34
?1
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Conejo Creek
Arroyo Las Posas
Calleguas Creek
Revolon Slough
Santa Clara River
Sant a Monica Mountains
017C
032A
167
168
175A
177A
189
190
194A
215 215A
216C
219A
222A
223A
239
259
261
263A
273A
275
403
412
505
507
509
512
Pleasant Valley Rd
Oxnard Blvd
5th St
Hueneme Rd
Central Ave
Lewis Rd
Ventura Rd
Oxnard
Ave
Freeman
Diversion
Brad el yRd
Price Rd
Aggen Rd
156
152
Cam arill o Hills
Active Precipitation Monitoring Network for the Oxnard Subbasin Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; VCWPD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-8. Active Precipitation Monitoring Network for the Oxnard Subbasin.mxd FIGURE 4-8
Ventura County Gauge Locations (VCWPD
2016; labeled by station number)
Recording Precipitation Gauge
Standard Precipitation
Storage Precipitation
Non-Standard Recorder
ALERT Precipitation Gauge
Storage Precip & ALERT
National Weather Service Site
Ventura County Rivers, Streams and Channels (VCWPD
2016)
) Freeman Diversion
") CIMIS Stations
Fox Canyon Groundwater Management Agency Boundary
(FCGMA 2016)
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area (EOPMA)
Forebay Management Area
West Oxnard Plain Management Area (WOPMA)
Oxnard Pumping Depression Management Area
Saline Intrusion Management Area
Revised Bulletin 118 Groundwater Basins and
Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02) 0123 0.5 n Miles
1274
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-50

INTENTIONALLY LEFT BLANK
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^_ ^_
^_
^_
^_ ^_
^_
^_
` `
^_^_ ^_ ^_ ^_ ^_ ^_ ^_ ^_
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis
Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
19L14
20M06
26J05
27C04
29D03
29F06 29L03
PNW 3
PNW 2 PNW 1
PNW 8
PNW 5
PNW 12
PNW 14
PNW 13
PNW 11
PNW 10
PNW 7
PNW 9
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-9 Proposed and existing Monitoring wells Semi-Perched.mxd 02 1 n Miles
FIGURE 4-9
Existing and Potential New Wells For Monitoring Groundwater Conditions in the Semi-Perched Aquifer Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
^_ Potential well screened in the semiperched aquifer (nested cluster) ` Potential well screened in the semiperched aquifer (GDE Monitoring) ^_ Existing monitoring well screened in
the semi-perched aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
PNW 1 Potential New Well and location number
1276
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-52

INTENTIONALLY LEFT BLANK
1277
)
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)
)
)
") )
")")
")
)))))
)
)
)
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") ") ")
") ")
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")")")
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)
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)
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")
")
")
")
")
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa C lara River
T02N
T01N
T01S
R20W
R23W
R22W R21W
06L04
06R01
07H01
17D02
19C01
19K10 19L12 19L13
31A08
31A09
32Q06
03F07
03F08
03F12
03F13
03F14
11B01
14K01
14R02
20J08
20M05
26J04
27C03
27R05 27R04
28G05 28G04
35E05 36K09
01C05
08L04
08L05
01H04
19B02
11J02
11Q01
12A01
12A02 12F03
12F04 12G03
12J02
12Q06 12R01 12R04
13C01
13N06 13N07
14A09 14D01
14F03
14G06 14G07
14G08
15L01
15P01 15R02
16R02
23B08 23B09
23H06
30A05
30C04
30K01
30K04
34K02
36E05
36E06
36C04
PNW 3
PNW 4
PNW 14
PNW 7
PNW 9
PNW 6
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-10 Proposed and existing Monitoring wells Oxnard.mxd 02 1 n Miles
FIGURE 4-10
Existing and Potential New Wells For Monitoring Groundwater Conditions in the Oxnard Aquifer Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
") Installation target for potential new
well screened in the Oxnard Aquifer
") Monitoring well screened in the
Oxnard Aquifer
) Non-monitoring well screened in the
Oxnard Aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
PNW 1 Potential New Well and location number
1278
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-54

INTENTIONALLY LEFT BLANK
1279
XW
W
W
XW
XW
XW
W
XW XW
XW
XW
XW
XW
XW XW
XW
XW
XW
XW
W
XW
W
WXW

XW XW XW XW XW XW
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
19L11
20C05
21N01
31A07
32Q07 32Q05
02A02
06R02
20M04 20J07
26J03
27C02
27R03
29D04
35E04 36K08
01H03
07L06
13N05
14G04
14G05
14H04
23B07
24P01
36E07 36E04
PNW 3
PNW 4
PNW 5
PNW 12
PNW 14
PNW 7
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-11 Proposed and existing Monitoring wells Mugu.mxd 02 1 n Miles
FIGURE 4-11
Existing and Potential New Wells For Monitoring Groundwater Conditions in the Mugu Aquifer Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
XW Installation target for potential well
screened in the Mugu Aquifer
XW Monitoring well screened in the
Mugu Aquifer
W Non-monitoring well screened in the
Mugu Aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
PNW 1 Potential New Well and location number
1280
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-56

INTENTIONALLY LEFT BLANK
1281
*
*
*
*
*#
*#
*# *
*#
*#
*
*#*
*
*
*#
*
**#
#*
#*
#*
#*
#*
#*
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
03F05
03R01
16D04
19A01
20J05
20M02
20M03
28G03 26M03
29D03 29D02
01C03
01C04
18H13
31P03
31P06
12N03
19J03 23B04
23B05
23B06
26B03
36E02 36E03
36E08
PNW 3
PNW 4
PNW 5
PNW 14
PNW 11
PNW 7
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-12 Proposed and existing Monitoring wells Hueneme.mxd 02 1 n Miles
FIGURE 4-12
Existing and Potential New Wells For Monitoring Groundwater Conditions in the Hueneme Aquifer Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
#* Installation target for potential well
screened in the Hueneme Aquifer
*# Monitoring well screened in the
Hueneme Aquifer
* Non-monitoring well screened in the
Hueneme Aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
PNW 1 Potential New Well and location number
1282
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-58

INTENTIONALLY LEFT BLANK
1283
(
(
!(
(
(
!(
(
!(
!(
!(
(
(
(
!(
!(
!( !(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
06J05
09C04
19L10
30A02
30L01
31A05 31A06
32K01
32Q04
20J04
20M01
25B04
25K02
26H02
28G02
29D01
35E02 35E03 36K06 36K07
01C02
01H02
07L04
23B03
PNW 3
PNW 4
PNW 5
PNW 14 PNW 10
PNW 7
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-13 Proposed and existing Monitoring wells Fox Canyon.mxd 02 1 n Miles
FIGURE 4-13
Existing and Potential New Wells For Monitoring Groundwater Conditions in the Fox Canyon Aquifer Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
!( Installation target for potential well
screened in the Fox Canyon Aquifer
!( Monitoring well screened in the Fox
Canyon Aquifer
( Non-monitoring well screened in the
Fox Canyon Aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
PNW 1 Potential New Well and location number
1284
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-60

INTENTIONALLY LEFT BLANK
1285
+
$+
$+
$+ $+
$+
$
$
$
$
?33
232 ?
126 ?
?1
?34
118 ?
Pacific Ocean
£¤101
Ventura
Oxnard
Port Hueneme
Camarillo
Moorpark
Bailey Fault
Oak Ridge Fault
Somis Fault Zone
Ventura Rd
Lewis Rd
Central Ave
Hueneme Rd
Pleasant Valley Rd
5th St
Arroyo Las Posas
Arroyo Simi
Arroyo S anta Rosa
Revolon
Sl ough
Cone jo Creek
Callegu asCreek
Arro yo Con e jo
Santa Clara Riv er
T02N
T01N
T01S
R20W
R23W
R22W R21W
19P03
32Q03 32Q02
28G01
35E01 36K05
08L03
PNW 8
PNW 5
PNW 12
PNW 9
Simi-Santa
Rosa Fault
Camarillo Fault
Springville
Fault Zone
Bailey Fault
Mount clef
Ridg e
Camar illo Hills
La s Po s a s Hills
Santa Monica
Mountains
Conejo
Mountain
Groundwater Sustainability Plan for the Oxnard Subbasin SOURCE: DWR; County of Ventura; UWCD; CMWD
Date: 6/3/2019 - Last saved by: dritter - Path: Z:\Hydro\Projects\Fox_Canyon_GMA\MXD\FINAL_MXD\OXNARD\CH_4_FIGURES\Figure 4-14 Proposed and existing Monitoring wells Grimes.mxd 02 1 n Miles
FIGURE 4-14
Existing and Potential New Wells For Monitoring Groundwater Conditions in the Grimes Canyon Aquifer Fox Canyon Groundwater Management
Agency Boundary (FCGMA 2016)
Faults (County of Ventura 2016)
Township (North-South) and Range (EastWest)
Revised Bulletin 118 Groundwater
Basins and Subbasins (DWR 2016c)
Las Posas Valley (4-008)
Pleasant Valley (4-006)
Oxnard (4-004.02)
Notes:
1) Well labels consist of an abbreviated
State Well Number (SWN). SWNs are based on
Township and Range in the Public Land Survey
System. To construct a full SWN from the
abbreviation shown on the map, concatenate
the Township, Range, abbreviation, and the letter
"S". Example: the SWN for the well labeled "15L01"
located in Township 02N (T02N) and
Range 22W (R22W) is 02N22W15L01S.
2) Aquifer designation information for individual wells was provided by FCGMA, CMWD and UWCD.

Legend
$ Potential installation target for
proposed well screened in the
Grimes Canyon Aquifer
$+ Monitoring well screened in the
Grimes Canyon Aquifer
+ Non-monitoring well screened in the
Grimes Canyon Aquifer
Oxnard Subbasin Management Areas
East Oxnard Plain Management Area
(EOPMA)
Forebay Management Area
West Oxnard Plain Management Area
(WOPMA)
Oxnard Pumping Depression Management
Area
Saline Intrusion Management Area
15P01 Abbreviated State Well Number (see notes)
PNW 1 Potential New Well and location number
1286
4 – MONITORING NETWORKS
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 4-62

INTENTIONALLY LEFT BLANK
1287
Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 5-1
CHAPTER 5

PROJECTS AND MANAGEMENT ACTIONS

5.1 INTRODUCTION TO PROJECTS AND

MANAGEMENT ACTIONS
Projects and management actions have been developed to meet the sustainability goal, measurable objectives, and undesirable results identified for the Oxnard Subbasin (Subbasin) in Chapter 3, Sustainability Management Criteria, of this Groundwater Sustainability Plan (GSP). Seawater intrusion in the aquifers of the Upper Aquifer System (UAS) and Lower Aquifer System (LAS) has been identified as the undesirable result that will impact beneficial uses of groundwater in the Subbasin.

To address potential impacts to beneficial uses and users of groundwater in the Subbasin resulting from groundwater production in excess of the current sustainable yield, several projects were developed for the Subbasin. The projects listed below were suggested by stakeholders, selected for inclusion in the GSP through a process by the Operations Committee of the Fox Canyon Groundwater Management Agency (FCGMA) Board of Directors (Board), and approved for inclusion in the GSP by the FCGMA Board. The criteria for including a project in the GSP included the following:
 Sufficient project information is available for evaluation and modeling.  Project increases sustainable yield, or reduces groundwater demand.  Project implementation is planned within 20 years.
 Project meets GSP Emergency Regulations Section 354.44 criteria.  There is an agency proponent for the project.
 Funding for the project is identified.

In the Oxnard Subbasin, five projects were determined by the Operations Committee to meet the above criteria. These five projects were incorporated into the future model scenarios to the extent possible (see Section 2.4.5, Projected Future Water Budget and Sustainable Yield). The inclusion of these projects does not constitute a commitment by the FCGMA Board to construct or fund the projects, but rather signals that these projects were sufficiently detailed to be included in groundwater modeling efforts that examined the quantitative impacts of the projects on groundwater elevations and the sustainable yield of the Subbasin. As currently envisioned, the projects in this GSP would be implemented by the project proponent or sponsoring agency. However, FCGMA may opt to implement projects in the future as necessary to achieve sustainability in the Subbasin. Additionally, all projects undertaken in the Subbasin will need to be approved and permitted by all relevant regulatory agencies. These agencies may include, but are not limited to, the Regional Water Quality Control Board and the State Water Resources Control Board. 1288
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In addition to the projects discussed in this chapter, the FCGMA Board has the authority to implement management actions to ensure that the Subbasin does not experience undesirable results. The primary management action that can be implemented by the FCGMA Board is restrictions on groundwater production. This authority was granted to the FCGMA Board in the enabling legislation that formed the FCGMA, and this action has been undertaken in the past to eliminate overdraft.

As discussed in Chapter 2, Basin Setting, groundwater modeling was used to evaluate projected water budget conditions and potential impacts to beneficial uses and users of groundwater in the basin. Without the type of projects described below, substantially greater reductions in groundwater production will be needed to meet the sustainability goal for the basin, which would lead to significant economic disruption and prevent groundwater in the basin from being put to beneficial use to the fullest extent possible. It is anticipated, and recommended, that FCGMA will evaluate, model, and conduct feasibility studies of other projects for achieving sustainable groundwater management for the 5-year update to this GSP to optimize basin management and minimize extraction restrictions.

5.2 PROJECT NO. 1 – GREAT PROGRAM ADVANCED WATER

PURIFICATION FACILITY

5.2.1 Description of Project No. 1
The Groundwater Recovery Enhancement and Treatment (GREAT) Program’s Advanced Water Purification Facility (AWPF) is part of the City of Oxnard’s GREAT Program, which focuses on using existing water resources more efficiently. The AWPF provides the City of Oxnard with a source of reclaimed water that can be used for landscape irrigation, agricultural, industrial process water, and groundwater recharge. The AWPF is designed to initially treat approximately 8 to 9 million gallons per day (mgd) of secondary effluent from the Oxnard Wastewater Treatment Plant and produce 6.25 mgd of product water for reclaimed water uses. This is equivalent to 7,000 acrefeet per year (AFY) of product water that can be delivered through existing infrastructure. The AWPF is currently producing up to 4,600 AFY. Advanced purified water was first delivered to agricultural operators in 2016. The portion of the project that is being considered for inclusion in GSP is the additional water that is being purchased by FCGMA to reduce groundwater extractions for which no Recycled Water Pumping Allocation is issued.

5.2.2 Relationship of Project No. 1 to Sustainability Criteria GREAT Program AWPF Project water was included in future groundwater modeling scenarios to examine the impact that the project may have on the sustainability criteria. This project was incorporated in the modeling along with the expansion of the GREAT Program AWPF (see Section

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and the temporary fallowing of agricultural land (see Section 5.6, Project No. 5 – Temporary Agricultural Land Fallowing Project). Therefore, the relationship between the impact of this project alone and the sustainability indicators has not been quantified. Rather, the potential effect of this project in the context of all three of these projects is presented in this discussion.

Relationship to Minimum Thresholds
The minimum thresholds for both the UAS and the LAS in the Oxnard Subbasin are higher than the historical low water levels and the spring 2015 water levels (see Chapter 3). In the UAS, the minimum thresholds are approximately 41 feet higher than historical low water levels and 25 feet higher than spring 2015 water levels. In the LAS, the minimum thresholds are approximately 70 feet higher than historical low water levels, and 38 feet higher than spring 2015 water levels.

The numerical groundwater model simulation of the Future Baseline With Projects scenario, which incorporates potential future projects including the GREAT Program AWPF Project, results in higher groundwater elevations than the Future Baseline scenario, which does not incorporate projects (see Section 2.4). Incorporation of the projects resulted in groundwater elevations at the end of the 50-year model simulation that were, on average, approximately 2 feet higher in the UAS and approximately 8 feet higher in the LAS. This suggests that the projects will assist with water level recovery in the Subbasin, a necessary first step to avoid exceedance of the minimum thresholds. Although implementation of the projects increases water levels in the Subbasin, these projects alone did not provide sufficient recycled water or redistribution of groundwater production to avoid exceedance of the minimum thresholds.

As modeled, the GREAT Program AWPF Project supplied approximately 4,600 AFY of recycled water to farmers in the vicinity of Hueneme Road (Chapter 2). This accounts for approximately half of the water delivered in the Future Baseline With Projects scenario. Because groundwater elevations were higher in the Future Baseline With Projects scenario than they were in the Future Baseline scenario, and because the GREAT Program AWPF Project supplied approximately half of the project water modeled this project is anticipated to result in measurably higher groundwater elevations in the Oxnard Subbasin. Therefore, the GREAT Program AWPF Project is anticipated to benefit the Subbasin and assist with raising groundwater elevations above the minimum thresholds in the future.

Relationship to Measurable Objectives
The relationship of the GREAT Program AWPF Project to the measurable objectives is similar to the relationship with the minimum thresholds. By measurably increasing water levels in the Subbasin, the GREAT Program AWPF Project water will help the Oxnard Subbasin meet the measurable objective water levels defined in Chapter 3. 1290
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5.2.3 Expected Benefits of Project No. 1
The AWPF product water that will be put to use in the Oxnard Subbasin is secondary wastewater effluent that is currently discharged to the Pacific Ocean. Therefore, this project provides a new source of water for use in the Subbasin. This additional water is expected to benefit the Oxnard Subbasin by providing water that would otherwise be pumped from the Subbasin to farmers in the vicinity of Hueneme Road, an area that is currently threatened by the inland migration of the saline water impact front (see Section 2.3, Groundwater Conditions).

5.2.4 Timetable for Implementation of Project No. 1
Phase 1 of the GREAT Program AWPF Project has already been permitted and constructed, and the AWPF Project is currently operating in the Subbasin. Under the current program, AWPF water is being delivered to farmers. The City of Oxnard receives a Recycled Water Pumping Allocation for delivered water used by farmers in lieu of groundwater production. Implementation of the project relative to the GSP will depend on the timetable necessary to deliver the GREAT Program AWPF water to farmers for in-lieu groundwater production for which no allocation or credits are provided to the City of Oxnard. Therefore, if the GREAT Program AWPF Project is incorporated into management of the Oxnard Subbasin for the purpose of increasing groundwater elevations to meet the sustainability criteria, the time for implementing the GREAT Program AWPF Project will depend on acquiring the necessary agreements between FCGMA and the City of Oxnard. This is anticipated to require less than 1 year.

5.2.5 Metrics for Evaluation of Project No. 1
Evaluation of the GREAT Program AWPF Project will be based on the quantity of water delivered to farmers in the vicinity of Hueneme Road and the associated reduction in groundwater production from this area. Groundwater producers in the Oxnard Subbasin have been required to report groundwater production to FCGMA since 1983. The GREAT Program AWPF water delivered to farmers will also have to be reported to FCGMA if this project is implemented as part of the GSP.

5.2.6 Economic Factors and Funding Sources for Project No. 1 The capital to construct the GREAT Program AWPF Project facilities has already been funded by City of Oxnard bonds and federal grant money (FCGMA 2018). Ongoing operations and maintenance are anticipated to equal approximately $300 per acre-foot (AF) of water generated by the project (FCGMA 2018). Funding for operations and maintenance has not been identified; however, as proposed, funding may come from a replenishment fee implemented by the FCGMA Board.
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Any action taken by the FCGMA Board, acting as the Groundwater Sustainability Agency for the portion of the Oxnard Subbasin in its jurisdiction, to impose or increase a fee shall be taken by ordinance or resolution. Should the FCGMA Board decide to fund a project through imposition of a replenishment fee, FCGMA will hold at least one public meeting, at which oral or written presentations may be made. Notice of the meeting will include an explanation of the fee to be considered and the notice shall be published pursuant to Section 6066 of the Government Code. 1 At least 20 days prior to the meeting, the Groundwater Sustainability Agency will make the data on which the proposed fee is based available to the public.

5.3 PROJECT NO. 2 – GREAT PROGRAM ADVANCED WATER

PURIFICATION FACILITY EXPANSION PROJECT

5.3.1 Description of Project No. 2
The GREAT Program’s AWPF is part of the City of Oxnard’s GREAT Program, which focuses on using existing water resources more efficiently. The purpose of the GREAT Program AWPF Expansion Project is to increase the production of high-quality recycled water within the City of Oxnard, the Oxnard Subbasin, and the Pleasant Valley Basin. This project will provide additional reclaimed water for Subbasin recharge. The AWPF Expansion Project is predicated on the availability of secondary effluent from the Oxnard Wastewater Treatment Plant or other available and appropriate source water. The main project components include purchase and installation of additional microfiltration, reverse osmosis, and ultraviolet/advanced oxidation equipment.

Additionally, the project will require construction of influent flow equalization facilities. The AWPF Expansion Project could occur in phases, which would be dictated by the availability of source water, recycled water uses and needs, and project funding.

5.3.2 Relationship of Project No. 2 to Sustainability Criteria GREAT Program AWPF Expansion Project water was included in future groundwater modeling scenarios to examine the impact that the project will have on the sustainability criteria. This project was incorporated in the modeling along with the GREAT Program AWPF Project (see Section 5.2, Project No. 1 – GREAT Program Advanced Water Purification Facility) and the temporary fallowing of agricultural land (see Section 5.6). Therefore, the relationship between the impact of this project alone and the sustainability indicators has not been quantified. Rather, the potential effect of this project in the context of all of three of these projects is presented in this discussion.

1 Publication of notice pursuant to Section 6066 of the Government Code: “shall be once a week for two successive weeks. Two publications in a newspaper, published once a week or oftener, with at least five days intervening between the respective publication dates not counting such publication dates are sufficient.” 1292
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Relationship to Minimum Thresholds
The numerical groundwater model simulation of the Future Baseline With Projects scenario, which incorporates potential future projects including the GREAT Program AWPF Expansion Project, results in higher groundwater elevations than the Future Baseline scenario, which does not incorporate projects (see Section 2.4, Water Budget). Incorporation of the projects resulted in groundwater elevations at the end of the 50-year model simulation that were, on average, approximately 2 feet higher in the UAS and approximately 8 feet higher in the LAS. This suggests that the projects will assist with water level recovery in the Subbasin, a necessary first step to avoid exceedance of the minimum thresholds. Although implementation of the projects increases water levels in the basin, these projects alone did not provide sufficient recycled water or redistribution of groundwater production to meet the minimum thresholds.

The AWPF Expansion Project water accounts for approximately half of the water delivered in the Future Baseline With Projects scenario. Because groundwater elevations were higher in the Future Baseline With Projects scenario compared to the Future Baseline scenario, and because the AWPF Expansion Project supplied approximately half of the project water modeled, the AWPF Expansion Project is anticipated to result in measurably higher groundwater elevations in the Oxnard Subbasin. Therefore, this project is anticipated to benefit the Subbasin and assist with raising groundwater elevations above the minimum thresholds in the future.

As modeled, the GREAT Program AWPF Expansion Project supplied approximately 4,500 AFY of recycled water to the United Water Conservation District (UWCD) Saticoy Spreading Grounds (see Section 2.4.5). This would be a recharge, rather than an in-lieu, program. However, the exact use of the AWPF Expansion Project water is not currently specified. It can be used for groundwater recharge, but it can also be used as part of an in-lieu program or for indirect potable reuse.

Relationship to Measurable Objectives
The relationship of the GREAT Program AWPF Expansion Project to the measurable objectives is similar to the relationship with the minimum thresholds. By measurably increasing water levels, the GREAT Program AWPF Expansion Project will help the Oxnard Subbasin meet the measurable objective water levels defined in Chapter 3.

5.3.3 Expected Benefits of Project No. 2
The AWPF Expansion Project product water that will be put to use in the Oxnard Subbasin is secondary wastewater effluent that is currently discharged to the Pacific Ocean. Therefore, this project provides a new source of water for use in the Subbasin. This additional water is expected to benefit the Oxnard Subbasin by providing additional recharge via the Saticoy Spreading Grounds (see Section 2.3).
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5.3.4 Timetable for Implementation of Project No. 2
The City of Oxnard has already constructed and already operates the GREAT Program AWPF.

As discussed in Section 5.3.1, Description of Project No. 2, the AWPF Expansion Project will require purchase and installation of additional equipment, as well as construction of influent flow equalization facilities. The expansion can occur in phases; therefore, the timetable for implementing the project is not fixed at this time. The implementation timetable for expansion of the AWPF is not dependent on permits or completion of California Environmental Quality Act (CEQA) documentation, which has already been obtained. The City of Oxnard estimates that the construction timetable for implementation of the AWPF Expansion Project is approximately 1 year.

The timetable for incorporating the GREAT Program AWPF Expansion Project water into sustainable management programs will also depend on how the water will be used. If, for example, the water will be conveyed to the Saticoy Spreading Grounds, the necessary infrastructure to convey the water will need to be constructed, in addition to construction of the expanded facility.

Depending on the permitting required and construction time frames, it is anticipated that the timetable for incorporation of the AWPF Expansion Project water in sustainable management programs may take an additional 1 to 5 years beyond what was estimated by the City of Oxnard for construction of the expanded AWPF alone.

5.3.5 Metrics for Evaluation of Project No. 2
Evaluation of the GREAT Program AWPF Expansion Project will be based on the quantity of water delivered by the project. This water will be metered and the quantity of water delivered will be reported to FCGMA annually.

5.3.6 Economic Factors and Funding Sources for Project No. 2 Expansion of the AWPF can occur in phases, and the degree to which the AWPF is expanded will depend on the quantity of water available and the demand for the water produced.

Therefore, the exact cost of expanding the GREAT Program AWPF is not currently known.

Under one potential expansion scenario, the facility upgrades are anticipated to cost approximately $16,600,000 (FCGMA 2018). Under this scenario, the water produced by the facility would cost approximately $1,900 per AF. Operations and maintenance costs for the expanded AWPF would be approximately $440 per AF. Funding sources have not yet been identified for this project, although a portion of the project may be funded by replenishment fees implemented by the FCGMA Board. Any action taken by the FCGMA Board to impose or increase a fee shall be taken by ordinance or resolution, and notice shall be provided of any meeting at which imposition of the ordinance or resolution will be discussed (see Section 5.2.6, Economic Factors and Funding Sources for Project No. 1). 1294
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5.4 PROJECT NO. 3 – RIVERPARK–SATICOY GRRP RECYCLED

WATER PROJECT

5.4.1 Description of Project No. 3
The RiverPark–Saticoy Groundwater Replenishment and Reuse Project (GRRP) Recycled Water Project will convey water produced by the GREAT Program AWPF Expansion Project (see Section 5.3) to the Saticoy Groundwater Recharge Facility and El Rio Groundwater Recharge Facility operated by UWCD (FCGMA 2018). In 2016, the City of Oxnard completed the northernmost portion of its 9.5-mile north–south Recycled Water Backbone Pipeline, which terminates at the RiverPark development adjacent to the Santa Clara River, north of Highway 101.

This pipeline does not currently reach UWCD’s groundwater recharge facilities. Under the GRRP Recycled Water Project, the Recycled Water Backbone Pipeline will be extended by 3 miles to convey water from the AWPF Expansion Project to UWCD groundwater recharge facilities. The 3-mile pipeline extension is called the RiverPark–Saticoy Pipeline. Up to 4,800 AFY of water will be conveyed to the UWCD recharge facilities via the Recycled Water Backbone and RiverPark– Saticoy Pipelines. It should be noted that this project does not provide water in addition to Project No. 2; rather, it provides the infrastructure to deliver the GREAT AWPF expansion water to the Saticoy Spreading Grounds.

5.4.2 Relationship of Project No. 3 to Sustainability Criteria The RiverPark–Saticoy GRRP Recycled Water Project, using the AWPF Expansion Project product water to recharge groundwater in the Oxnard Forebay, was included in future groundwater modeling scenarios to examine the impact that the project will have on the sustainability criteria.

The RiverPark–Saticoy GRRP Recycled Water Project is the same as the GREAT Program AWPF Expansion Project, as incorporated into the numerical groundwater model simulations, because the RiverPark–Saticoy GRRP Recycled Water Project simply provides the infrastructure to convey the water. It does not provide additional water to the Subbasin beyond what was modeled for the GREAT Program AWPF project. As discussed in Section 5.2.2, Relationship of Project No. 1 to Sustainability Criteria, and Section 5.3.2, Relationship of Project No. 2 to Sustainability Criteria, the relationship between the impact of this project alone and the sustainability indicators has not been quantified. Rather, the potential effect of this project in the context of all three of these projects is presented in this discussion.

Relationship to Minimum Thresholds
As modeled, the RiverPark–Saticoy GRRP Recycled Water Project provided the infrastructure to supply approximately 4,500 AFY of recycled water to the UWCD Saticoy Spreading Grounds (see Section 2.4.5). This would be a recharge, rather than an in-lieu, program. The numerical groundwater model simulation of the Future Baseline With Projects scenario, which incorporates 1295
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potential future projects including the RiverPark–Saticoy GRRP Recycled Water Project, results in higher groundwater elevations than the Future Baseline scenario, which does not incorporate projects (see Section 2.4). This suggests that the projects will assist with water level recovery in the Subbasin, a necessary first step to avoid exceedance of the minimum thresholds. Although implementation of the projects increases water levels in the basin, these projects alone did not provide sufficient recycled water or redistribution of groundwater production to avoid the exceedance of the minimum thresholds.

The AWPF Expansion Project water, delivered via the RiverPark–Saticoy GRRP Recycled Water Project, accounts for approximately half of the water delivered in the Future Baseline With Projects scenario. Because groundwater elevations were higher in the Future Baseline With Projects scenario than they were in the Future Baseline scenario, and because the RiverPark–Saticoy GRRP Recycled Water Project supplied approximately half of the project water modeled, the RiverPark– Saticoy GRRP Recycled Water Project is anticipated to result in measurably higher groundwater elevations in the Oxnard Subbasin. Therefore, the RiverPark–Saticoy GRRP Recycled Water Project is anticipated to benefit the Subbasin and assist with raising groundwater elevations above the minimum thresholds in the future.

Relationship to Measurable Objectives
The relationship of the RiverPark–Saticoy GRRP Recycled Water Project to the measurable objectives is similar to the relationship with the minimum thresholds. By measurably increasing water levels, the RiverPark–Saticoy GRRP Recycled Water Project will help the Oxnard Subbasin meet the measurable objective water levels defined in Chapter 3.

5.4.3 Expected Benefits of Project No. 3
The RiverPark–Saticoy GRRP Recycled Water Project is expected to benefit the Oxnard Subbasin by providing the infrastructure to take secondary treated wastewater from the Oxnard Water Treatment Plant and using it for groundwater recharge (FCGMA 2018). Currently, this water is being discharged to the Pacific Ocean. The RiverPark–Saticoy Pipeline and the GRRP will help ensure that excess flows from the AWPF will be used for groundwater recharge. In addition, the product water from the AWPF Expansion Project is of higher quality than groundwater in the Oxnard Forebay. Therefore, by using this water to recharge groundwater in the Forebay, implementation of the GRRP Recycled Water Project is expected to improve groundwater quality in the Forebay (FCGMA 2018).

5.4.4 Timetable for Implementation of Project No. 3
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initial study/mitigated negative declaration has been prepared. The required project permits (a groundwater replenishment reuse permit and a California Department of Transportation (Caltrans) permit) are anticipated to take 12 to 18 months to obtain, and the likelihood of obtaining these permits is anticipated to be high (FCGMA 2018).

5.4.5 Metrics for Evaluation of Project No. 3
The metric for evaluation of the RiverPark–Saticoy GRRP Recycled Water Project will be the quantity of water delivered to UWCD’s groundwater recharge facilities. UWCD will meter the deliveries and will report these to FCGMA for incorporation in the annual and periodic GSP evaluation process.

5.4.6 Economic Factors and Funding Sources for Project No. 3 Funding sources for the RiverPark–Saticoy GRRP Recycled Water Project is proposed to come from either UWCD Zone B or FCGMA funds (FCGMA 2018). UWCD proposes funding assistance from FCGMA for the capital cost of the project, which is estimated to be $6.4 million, with an annual operations and maintenance cost of approximately $5 million to $7.5 million. The resulting water cost would be approximately $1,000 to $1,500 per AF. These operating costs are anticipated to be provided by a pump charge administered by FCGMA. The timeline necessary to secure funding for the project is anticipated to be the same as the construction timeline.

Any action taken by the FCGMA Board to impose or increase a fee shall be taken by ordinance or resolution, and notice shall be provided of any meeting at which imposition of the ordinance or resolution will be discussed (see Section 5.2.6).

5.5 PROJECT NO. 4 – FREEMAN EXPANSION PROJECT

5.5.1 Description of Project No. 4
UWCD currently operates the Freeman Diversion on the Santa Clara River, which diverts surface water flows from the river into recharge facilities for the purpose of providing additional recharge to the Oxnard Subbasin, and for direct delivery to growers via UWCD pipelines. Through time, more restrictive environmental regulatory requirements have lessened the amount of Santa Clara River surface water available to be diverted at the Freeman Diversion. The Freeman Expansion Project proposes constructing facilities capable of diverting surface water at higher flow rates and with higher sediment loads than the currently diverted flows (FCGMA 2018). Using the higher flows, which are less conducive to fish migration, has been encouraged by both regulatory agencies and non-governmental organizations (FCGMA 2018).
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The Freeman Expansion Project would expand the recharge facilities, using two former gravel mines located adjacent to UWCD’s Noble Basin recharge facility that have not previously been used for groundwater recharge, and would increase the capacity of UWCD’s diversion system (FCGMA 2018). The project would also include modification and expansion of existing fish screens, modifications to the existing desilting basin, and construction of a high-capacity conveyance to the former Ferro aggregate mining pit. Although the exact capacity of the project is not currently known, UWCD anticipates that at full project build-out, the expanded facility could provide an additional 7,400 AF of diversions relative to the current diversion capacity (FCGMA 2018).

5.5.2 Relationship of Project No. 4 to Sustainability Criteria Historically UWCD has diverted over 62,000 AFY from the Freeman Diversion (see Table 2-8).

The Freeman Expansion Project would provide up to an additional 7,400 AF. Although expansion of UWCD’s diversion capabilities at the Freeman Diversion was not explicitly modeled in the GSP future projects scenarios, historical groundwater elevations are strongly and positively correlated with the quantity of surface water diverted by UWCD. Therefore, increased surface water diversions that will be delivered directly to agricultural users, thereby offsetting groundwater production, or that will be recharged via UWCD’s recharge facilities will help increase water levels in the Subbasin.

Relationship to Minimum Thresholds
Groundwater elevations in the Oxnard Subbasin are currently below the minimum thresholds proposed in Chapter 3 of this GSP. Increased recharge of surface water that currently flows to the Pacific Ocean will help water levels recover to elevations above the proposed minimum thresholds.

The magnitude of the groundwater level rise will depend on the quantity of additional recharge available via the expanded diversion facilities.

Relationship to Measurable Objectives
The relationship of the Freeman Expansion Project to the measurable objectives is the same as the relationship with the minimum thresholds. By increasing water levels in the Subbasin, the Freeman Diversion Project will help the Oxnard Subbasin meet the measurable objective water levels defined in Chapter 3.

5.5.3 Expected Benefits of Project No. 4
The Freeman Expansion Project will provide an additional source of water to the Oxnard Subbasin by diverting high flows, which are not as suitable for fish migration, from the Santa Clara River and using those flows to provide additional groundwater recharge. The surface water flows in the Santa Clara River are lower in total dissolved solids and nitrate concentration compared to the 1298
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groundwater in the Oxnard Forebay. Therefore, this project will reduce the concentrations of these constituents in the groundwater. Additionally, replenishing the groundwater will reduce pump lift, and therefore energy consumption, for municipal and agricultural pumpers (FCGMA 2018).

5.5.4 Timetable for Implementation of Project No. 4
The timetable for implementation of the Freeman Expansion Project is estimated to be between 2 and 10 years (FCGMA 2018). The required modifications to the conveyance system needed to deliver turbid water have been analyzed, and this project was included in the UWCD Habitat Conservation Plan (FCGMA 2018). However, the project has not yet undergone environmental review, engineering design, or permitting.

5.5.5 Metrics for Evaluation of Project No. 4
The metric for evaluation of the Freeman Expansion Project would be the quantity of surface water diverted at flow rates that are higher than the current maximum flow rate that can be diverted. UWCD meters diversions from the Santa Clara River and would report these to FCGMA.

5.5.6 Economic Factors and Funding Sources for Project No. 4 Improvements to the conveyance system, fish screens, and desilting basin inlet are estimated to cost $31 million (FCGMA 2018). The annual operations and maintenance cost is estimated to be $700,000. The combined capital and operations and maintenance cost of the water is estimated to be approximately $4,300 AFY. Funding sources for the project are anticipated to include grant money, UWCD rate payers, and replenishment fees from FCGMA.

Any action taken by the FCGMA Board to impose or increase a fee shall be taken by ordinance or resolution, and notice shall be provided of any meeting at which imposition of the ordinance or resolution will be discussed (see Section 5.2.6).

5.6 PROJECT NO. 5 – TEMPORARY AGRICULTURAL LAND

FALLOWING PROJECT

5.6.1 Description of Project No. 5
The Temporary Agricultural Land Fallowing Project would use replenishment fees to lease and temporarily fallow agricultural land (FCGMA 2018). This would result in decreased groundwater production on the parcels or ranches that are fallowed, and an overall reduction in groundwater demand in the Subbasin. Parcels or ranches in areas susceptible to seawater intrusion would be targeted with this project (FCGMA 2018).
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5.6.2 Relationship of Project No. 5 to Sustainability Criteria Temporary fallowing of agricultural land was included in future groundwater modeling scenarios to examine the impact that the project will have on the sustainability criteria (see Section 2.4.5).

As discussed in Sections 5.2.2 and 5.3.2, the relationship between the impact of this project alone and the sustainability indicators has not been quantified. Rather, the potential effect of this project in the context of all three of these projects is presented in this discussion.

Relationship to Minimum Thresholds
As modeled, the Temporary Agricultural Land Fallowing Project reduced production from the Subbasin by approximately 500 AFY (see Section 2.4.5). The numerical groundwater model simulation of the Future Baseline With Projects scenario, which incorporates potential future projects including the Temporary Agricultural Land Fallowing Project, results in higher groundwater elevations than the Future Baseline scenario, which does not incorporate projects (see Section 2.4). This suggests that the projects will assist with water level recovery in the Subbasin, a necessary first step to meet the minimum threshold. Although implementation of the projects increases water levels in the basin, these projects alone did not provide sufficient supplemental water or redistribution of groundwater production to meet the minimum thresholds. Additionally, the Temporary Agricultural Land Fallowing Project accounted for approximately 7% of the total volume of water delivered or saved by all of the projects in the Oxnard Subbasin that were incorporated into the future groundwater model scenarios. The effect of this project on groundwater elevations is likely smaller than that of other projects incorporated into the future model scenarios. However, the value of this project is more directly connected with the location of the land that would be fallowed. If the project can target areas that are prone to seawater intrusion, the impact of this project will be greater than would be indicated by a comparison of the volume of water supplied.

Relationship to Measurable Objectives
The relationship of the Temporary Agricultural Land Fallowing Project to the measurable objectives is similar to the relationship with the minimum thresholds. By increasing water levels and fallowing agricultural land prone to seawater intrusion, the Temporary Agricultural Land Fallowing Project will help the Oxnard Subbasin meet the measurable objective water levels defined in Chapter 3.

5.6.3 Expected Benefits of Project No. 5
Temporary fallowing is a quick way to reduce demand with no capital costs or infrastructure needed. Because it is inexpensive, it is envisioned that temporary fallowing could be implemented early, while other long-term solutions are investigated and implemented. The Temporary 1300
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Agricultural Land Fallowing Project will benefit the Oxnard Subbasin by mitigating seawater intrusion in the Subbasin. This project would complement a water market that is currently being developed for the Subbasin by providing an alternative method for landowners to monetize pumping allocations (FCGMA 2018).

5.6.4 Timetable for Implementation of Project No. 5
The project is currently in the planning phase but does not require construction of new facilities and is unlikely to require permitting. CEQA compliance has not yet been initiated but the project proponents anticipate that a negative declaration or a mitigated negative declaration may be sufficient (FCGMA 2018). The project could be implemented when FCGMA is able to collect replenishment fees, and willing lessors are found to participate.

5.6.5 Metrics for Evaluation of Project No. 5
The metric for evaluation of the Temporary Agricultural Land Fallowing Program will be the volume of groundwater that is not produced from wells that supply the fallowed acreage. FCGMA has required groundwater production reporting since 1983. Groundwater production rates from before the project is implemented will be compared to groundwater production rates when the parcel or ranch has been fallowed. If the project is implemented, the historical production rates and associated base period for calculating those rates will be determined.

5.6.6 Economic Factors and Funding Sources for Project No. 5 The funding source for this project is anticipated to be replenishment fees collected by FCGMA.

The cost of water under this project is estimated to be $1,200 to $1,800 per acre-foot. Any action taken by the FCGMA Board to impose or increase a fee shall be taken by ordinance or resolution, and notice shall be provided of any meeting at which imposition of the ordinance or resolution will be discussed (see Section 5.2.6)

5.7 MANAGEMENT ACTION NO. 1 – REDUCTION IN

GROUNDWATER PRODUCTION

5.7.1 Description of Management Action No. 1
The primary management action proposed under this GSP is a Reduction in Groundwater Production from the Oxnard Subbasin. FCGMA has had the authority to monitor and regulate groundwater production in the Oxnard Subbasin since 1983. The FCGMA Board has used its authority to reduce groundwater production from the Subbasin in the past, and will continue to exert its authority over groundwater production as the Groundwater Sustainability Agency for the Subbasin.
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The estimated long-term rate of groundwater production in the UAS that will prevent net seawater intrusion after 2040 is approximately 32,000 AFY ± 4,100 to 6,000 AFY (see Section 2.4.5). The estimated long-term rate of groundwater production in the LAS that will prevent net seawater intrusion after 2040 is approximately 7,000 AFY ± 2,300 to 3,600 AFY (see Section 2.4.5).

Reductions in groundwater production were modeled as a linear decrease from the 2015–2017 production rates. The exact reductions that will be implemented in the Subbasin over the next 5 years will be determined by the FCGMA Board based on the data collected and analyzed for this GSP. These reductions will be evaluated based on the potential paths to reaching sustainability discussed in Chapter 3.

5.7.2 Relationship of Management Action No. 1 to
Sustainability Criteria
Reducing groundwater production in the Oxnard Subbasin has a measurable impact on groundwater elevations. Groundwater elevations, in turn, control seawater intrusion. Seawater intrusion occurs in the Subbasin when groundwater elevations fall below threshold elevations that maintain sufficient hydrostatic pressure to keep seawater from moving landward. The relationship between seawater intrusion and groundwater elevation is impacted by groundwater production throughout the Subbasin, but is strongest in wells adjacent to the coast.

The effect of Reduction in Groundwater Production on groundwater level elevations was simulated using a numerical groundwater model (see Section 2.4.5). The results of the model and the relationship between Reduction in Groundwater Production and the sustainability criteria is discussed below.

Relationship to Minimum Thresholds
In the absence of additional projects, purchase of imported water, and shifting groundwater production locations, Reduction in Groundwater Production in the Subbasin is a critical component of achieving sustainability. When groundwater production was reduced from the 2015–2017 average production rates, simulated future groundwater elevations in the Subbasin recovered to elevations that remained above the minimum threshold after 2040 (see Section 2.4.5). The longterm production rate necessary to maintain groundwater elevations above the minimum threshold depended on several factors, including the simulated future climate, the quantity of surface water available to recharge the Subbasin, and the number of projects undertaken. Therefore, the numerical groundwater simulation results suggest a range of potential reductions in groundwater production that will maintain groundwater elevations above the minimum thresholds. This range is anticipated to change as additional data are collected and additional projects are implemented over the next 5 years. Therefore, any reductions implemented by the FCGMA Board over the initial 5-year period after the GSP is adopted will be evaluated and may be changed as warranted by future conditions in the Subbasin.
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Groundwater Sustainability Plan for the Oxnard Subbasin 9837 December 2019 5-16
Relationship to Measurable Objectives
The relationship between Reduction in Groundwater Production and the measurable objectives is similar to the relationship between Reduction in Groundwater Production and the minimum thresholds. Numerical groundwater model simulations suggest a range of potential groundwater production rates that would result in groundwater elevations that are higher than the measurable objective half of the time and lower than the measurable objective half of the time (see Section 3.5, Measurable Objectives). As discussed previously, this range is anticipated to change as additional data are collected and additional projects are implemented over the next 5 years. Therefore, any reductions implemented by the FCGMA Board over the initial 5-year period after the GSP is adopted will be evaluated and may be changed as warranted by future conditions in the Subbasin.

5.7.3 Expected Benefits of Management Action No. 1
The primary benefit related to Reduction in Groundwater Production is recovery of groundwater elevations that have historically allowed for seawater intrusion in the Oxnard Subbasin. Reduction in Groundwater Production can be used to close any differential between groundwater elevations that can be obtained through implementation of projects and the groundwater elevations necessary to prevent future net seawater intrusion in the UAS and the LAS.

5.7.4 Timetable for Implementation of Management Action No. 1 The FCGMA Board already has the authority to reduce groundwater production in the Subbasin.

Therefore, reductions can be implemented within months of GSP adoption, once the proposed reductions have gone through the FCGMA Board approval process.

5.7.5 Metrics for Evaluation of Management Action No. 1 The metric for evaluation of Reduction in Groundwater Production will be groundwater elevations in the UAS and the LAS. As groundwater elevations recover, additional projects are developed, and basin management is optimized, groundwater production rates will continue to be evaluated and adjusted accordingly.

5.7.6 Economic Factors and Funding Sources for Management Action No. 1
Program administration, investigations, inspections, compliance assistance, and enforcement of the Reduction in Groundwater Production management action will rely on funding from pumping fees imposed by FCGMA. Economic factors that will affect Reduction in Groundwater Production include impacts to the users of groundwater in the Subbasin. Potential economic impacts to stakeholders will be considered in the decision process for selecting future groundwater production rates and reductions necessary to meet the sustainability goal for the Subbasin. 1303
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5.7.7 Management Action No. 1 Uncertainty
Groundwater production from the Oxnard Subbasin has resulted in historical seawater intrusion, and groundwater model simulations indicate that sustainable groundwater production rates will need to be lower than historical rates to prevent net seawater intrusion in each aquifer system after 2040. Nevertheless, uncertainty remains regarding the exact reductions in groundwater production required to achieve the sustainability goals for the Subbasin. Uncertainty in the hydrogeologic conceptual model and the numerical groundwater model is discussed in Chapter 2 of this GSP.

Uncertainty in the minimum thresholds and measurable objectives is discussed in Chapter 3.

Chapters 2 and 3 also discuss uncertainty associated with the future location of groundwater production and impacts of projects that will optimize management of the Subbasin.

Because of the existing uncertainty associated with future conditions in the Subbasin, a plan for exact reductions and groundwater elevation triggers for those reductions has not been developed as part of this GSP. Instead, FCGMA will work to develop this plan over next 20 years, as the level of uncertainty is reduced. FCGMA recognizes that a specific long-term plan that incorporates stakeholder feedback and the need for flexibility in groundwater management will have to be adopted by 2040 to provide users of groundwater in the Subbasin with the tools necessary to plan for sustainable groundwater production into the future.

5.8 MANAGEMENT ACTION NO. 2 – WATER MARKET

PILOT PROGRAM
A Water Market Pilot Program is currently being conducted by the FCGMA as a means of increasing operational management of groundwater in the Subbasin. The pilot program will run through July 2019 and may be extended to October 2019 (FCGMA 2019). The program is open to agricultural operators in the Oxnard Subbasin who are authorized by FCGMA to participate.

Participants are able to submit anonymous bids and offers to an electronic trading desk that matches potential buyers and sellers. Matching takes place at 4:00 p.m. on Friday each week of the pilot program (FCGMA 2019). Transfer of extraction allocation will be reported to FCGMA by the Exchange Administrator.

Trades are limited by both geography and quantity. Transfers that result in a net increase in the total market allocation for participants in the Saline Water Intrusion Management Area or Pumping Depression Management Areas are not allowed. Additionally, participants with a well located in the Saline Water Intrusion Management Area may receive a transfer of market allocation only from another participant with a well in the Saline Water Intrusion Management Area. The same is true for participants in the Pumping Depression Management Areas. 1304
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Analysis of the Water Market Pilot Program will be conducted and its suitability for incorporation as a management action for the Subbasin will be determined after the pilot program is completed in July 2019.

5.9 REFERENCES CITED
FCGMA. 2018. “Full Agenda Package: Special Board Meeting of August 29, 2018.” Meeting agenda, minutes, and preliminary project descriptions for GSPs currently in progress.

August 29, 2018 Accessed May 10, 2019. https://ventura.granicus.com/ MetaViewer.php?view_id=45&clip_id=5067&meta_id=661400.

FCGMA. 2019. “Rules and Regulations Phase 2 (Extended Water Market Pilot Program).” Accessed May 15, 2019. http://www.fcgma.org/images/WMPilot-RulesRegs-Phase2ext.pdf. 1305
CITY
CITY OF OXNARD | MAY 2026

PUBLIC DRAFT
2025 URBAN WATER

MANAGEMENT PLAN
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CITY OF OXNARD
2025 Urban Water
Management Plan- Draft
MAY 2026
Prepared by Water Systems Consulting, Inc
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City of Oxnard

ACKNOWLEDGEMENTS
The 2025 Urban Water Management Plan- Draft was prepared by Water Systems Consulting, Inc. The primary authors are listed below.

David Williams, EIT
Spencer Waterman
Water Systems Consulting, Inc. would like to acknowledge the significant contributions of City of Oxnard. The primary contributors are listed below.

Abraham Maldonado
Brenda Heredia
Chris Peyton
Michael Wolfe, PE
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City of Oxnard Table of Contents
2025 Urban Water Management Plan- Draft | i

TABLE OF CONTENTS
1 Introduction and Lay Description ........................................................................................1-1

1.1 Introduction for City .....................................................................................................1-2

1.2 California Water Code .................................................................................................1-2

1.3 UWMP Organization....................................................................................................1-3

1.4 UWMPs in Relation to Other Efforts ............................................................................1-4

1.5 UWMPs and Grant or Loan Eligibility ..........................................................................1-5

1.6 Demonstration of Consistency with the Delta Plan......................................................1-5 2 Plan Preparation .................................................................................................................2-1

2.1 Basis for Preparing a Plan...........................................................................................2-2

2.2 Coordination and Outreach .........................................................................................2-2

2.3 Completed Steps for UWMP and WSCP.....................................................................2-6 3 System Description.............................................................................................................3-1

3.1 General Description.....................................................................................................3-2

3.2 Service Area Boundary Maps......................................................................................3-2

3.3 Service Area Climate...................................................................................................3-4

3.4 Service Area Population, Demographics, and Socioeconomics..................................3-5

3.5 Land Uses within Service Area....................................................................................3-6 4 Water Use Characterization................................................................................................4-1

4.1 Past, Current, and Projected Water Use by Sector.....................................................4-2

4.2 Climate Change Considerations................................................................................4-14 5 SB X7-7 Baselines, Targets, and 2025 Compliance...........................................................5-1

5.1 Compliance and Future Water Use Efficiency Requirements .....................................5-2 6 Water Supply Characterization ...........................................................................................6-1

6.1 Water Supply Analysis Overview.................................................................................6-2

6.2 Water Supply Characterization....................................................................................6-4

6.3 Energy Intensity.........................................................................................................6-28 7 Water Service Reliability and Drought Risk Assessment ...................................................7-1

7.1 Introduction..................................................................................................................7-2

7.2 Water Service Reliability Assessment .........................................................................7-2

7.3 Drought Risk Assessment .........................................................................................7-10 8 Water Shortage Contingency Plan .....................................................................................8-1

8.1 Introduction..................................................................................................................8-2 1309
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8.2 Overview of WSCP Components ................................................................................8-2 9 Demand Management Measures .......................................................................................9-1

9.1 Introduction..................................................................................................................9-2

9.2 Existing Demand Management Measures...................................................................9-3

9.3 Reporting Implementation ...........................................................................................9-6

9.4 Water Use Objectives (Future Requirements)...........................................................9-11 10 Plan Adoption, Submittal, and Implementation .............................................................10-1

10.1 Completed Steps for UWMP and WSCP...............................................................10-2 References........................................................................................................................... REF-1 Appendix A Water Shortage Contingency Plan ..................................................................... A Appendix B Reduced Delta Reliance ..................................................................................... B Appendix C DWR Checklist.................................................................................................... C Appendix D Notification Letters and Outreach ....................................................................... D Appendix E Public Hearing Notices ....................................................................................... E Appendix F Resolution of UWMP and WSCP Adoption..........................................................F Appendix G Standard DWR Tables........................................................................................G 1310
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LIST OF FIGURES
Figure 3-1. City of Oxnard Service Area ....................................................................................3-3 Figure 3-2. City of Oxnard General Plan Designation Areas .....................................................3-8 Figure 4-1. Historic Water Consumption....................................................................................4-3 Figure 4-2. UWUO Projections by Component, AFY...............................................................4-11 Figure 4-3. Historic and Projected Demand Scenarios............................................................4-12 Figure 5-1. Historic Gross Water Use and Per Capita Water Use .............................................5-3 Figure 6-1. Supply Schematic....................................................................................................6-3 Figure 6-2. Local Groundwater Basins ......................................................................................6-9 Figure 6-3. Oxnard Subbasin Profile........................................................................................6-10 Figure 7-1. Normal Year Potable Supply and Demand Comparison .........................................7-8 1311
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LIST OF TABLES
Table 2-1: DWR 2-1R Public Water Systems ............................................................................2-2 Table 2-2: DWR 2-2 Plan Identification......................................................................................2-2 Table 2-3: DWR 2-3 Agency Identification.................................................................................2-2 Table 2-4. Agency Coordination ................................................................................................2-4 Table 2-5: DWR 2-4 Water Supplier Information Exchange ......................................................2-6 Table 3-1. Average Monthly Climate Data, 2010-2024..............................................................3-4 Table 3-2: Historical, Current, and Projected Population...........................................................3-6 Table 4-1. DWR 4-1R Actual Demands for Water, 2025, AFY ..................................................4-4 Table 4-2: DWR 4-5R Month Water Loss Audit Reporting ........................................................4-4 Table 4-3: DWR 4-6R Progress Towards 2028 Water Loss Standard ......................................4-6 Table 4-4. Water Efficiency Standard by Reporting Period .......................................................4-7 Table 4-5. UWUO Components Growth Comparison ................................................................4-8 Table 4-6. UWUO Projections by Component, AFY ................................................................4-10 Table 4-7. DWR 4-2R Projected Demands for Water..............................................................4-13 Table 4-8. Projected Demands for Water, Transferred Water .................................................4-14 Table 4-9. DWR 4-3R Inclusion in Water Use Projections.......................................................4-14 Table 5-1. SB X7-7 2020 Target Progress.................................................................................5-2 Table 6-1: DWR 6-8R Actual Water Supplies ............................................................................6-3 Table 6-2. Oxnard Subbasin GSP & First Periodic Evaluation Sustainable Yield Scenarios.....6-6 Table 6-3: Key FCGMA Ordinances and Resolutions .............................................................6-11 Table 6-4: DWR 6-1R Groundwater Volume Pumped, AFY....................................................6-15 Table 6-5: DWR 6-2R Wastewater Collected within Service Area in 2025..............................6-17 Table 6-6: DWR 6-3R Wastewater Treatment and Outcomes within Service Area in 2025, AFY .................................................................................................................................................6-18 Table 6-7: DWR 6-4R Recycled Water Direct Beneficial Uses Within Service Area, AFY ......6-21 Table 6-8: DWR 6-5R 2020 Recycled Water Use Projection Compared to 2025 Actual.........6-22 Table 6-9: DWR 6-6R Methods to Expand Future Recycled Water.........................................6-23 1312
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2025 Urban Water Management Plan- Draft | v
Table 6-10: DWR 6-8DS Source Water Desalination ..............................................................6-24 Table 6-11: DWR 6-7R Expected Future Water Supply Projects or Programs........................6-26 Table 6-12: DWR 6-9R Projected Water Supplies...................................................................6-27 Table 6-13: DWR O-1B: Recommended Energy Intensity Total Utility Approach....................6-28 Table 7-1: Factors Resulting in Inconsistency of Supply ...........................................................7-3 Table 7-2: Consecutive Dry Year Percent Reductions by Source. ............................................7-4 Table 7-3: DWR 7-1R Basis for Water Year Data (Reliability Assessment) ..............................7-7 Table 7-4: DWR 7-2R Normal Year Potable Supply and Demand Comparison ........................7-7 Table 7-5. DWR 7-3R Single Dry Year Potable Water Supply and Demand Comparison ........7-8 Table 7-6: DWR 7-4R Multiple Dry Years Supply and Demand Comparison ............................7-9 Table 7-7: DWR 7-5 Five-Year Drought Risk Assessment ......................................................7-11 Table 9-1: Public Water Conservation Education 2021 - 2025 ..................................................9-7 Table 9-2. Public Outreach 2021-2025 ......................................................................................9-7 Table 9-3: Water Waste Tracking Summary 2021 - 2025..........................................................9-8 Table 9-4: Device Retrofits 2021-2025 ......................................................................................9-9 Table 9-5. Rebate Program Implementation, Participation Counts............................................9-9 Table 9-6. Rebate Program Implementation, Total Rebate Values1 ........................................9-10 1313
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ACRONYMS & ABBREVIATIONS
°C Degrees Celsius
°F Degrees Fahrenheit
AB Assembly Bill
AF Acre Foot
AFY Acre Feet per Year
AHHG Area of Historic High Groundwater
AMR Automatic Meter Reading
APA Administrative Procedures Act
AWWA American Water Works Association
BMP Best Management Practice
CALWARN California Water/Wastewater Agency Response Network CAT Climate Action Team
CCF Hundred Cubic Feet
CCR California Code of Regulations
CEQA California Environmental Quality Act
DCR DWR SWP Delivery Capacity Report
DDW SWRCB Division of Drinking Water
DFW California Department of Fish and Wildlife
DIP Ductile Iron Pipe
DMM Demand Management Measure
DWR California Department of Water Resources
EIR Environmental Impact Report
EPA United States Environmental Protection Agency
ERNIE Emergency Response Network of the Inland Empire
ESA Endangered Species Act
ET Evapotranspiration
ETO Reference Evapotranspiration
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GAC Granulated Activated Carbon
GIS Geographic Information System
GPCD Gallons per Capita per Day
GPM Gallons per Minute
HECW High Efficiency Clothes Washer
HET High Efficiency Toilet
IX Ion Exchange
KAF Thousand Acre Feet
KAFY Thousand Acre Feet per Year
LAFCO Local Agency Formation Commission
MAF Million Acre-Feet
MCL Maximum Contaminant Level
MF Multi-family
MG Million Gallons
MGD Million Gallons per Day
MSL Mean Sea Level
MTBE Methyl Tertiary Butyl Ether
NMFS National Marine Fisheries Service
NOAA National Oceanic and Atmospheric Administration
NPDES National Pollutant Discharge Elimination System
O-H Oxnard-Hueneme
PCE Perchloroethylene
PVC Polyvinyl Chloride
QWEZ Qualified Water Efficient Landscaper
RIX Rapid Infiltration and Extraction
RPA Reasonable and Prudent Alternative
RUWMP Regional Urban Water Management Plan
RWQCB Regional Water Quality Control Board
SBX7-7 Senate Bill 7 of Special Extended Session 7
SF Single Family
SOC Synthetic Organic Chemicals
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SOI Sphere of Influence
SWRCB State Water Resources Control Board
TDS Total Dissolved Solids
TCE Trichloroethylene
ULFT Ultra-Low Flush Toilet
UV Ultraviolet
UWMP Urban Water Management Plan
UWMP ACT Urban Water Management Planning Act
VOC Volatile Organic Compound
WBIC Weather Based Irrigation Controller
WSCP Water Shortage Contingency Plan
WFF Water Filtration Facility
WSS Water Sense Specification
WTP Water Treatment Plant
WWTP Wastewater Treatment Plant
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City of Oxnard
2025 Urban Water Management Plan- Draft |1-1
1 Introduction and Lay Description
This chapter provides a brief overview of the City of Oxnard (City) and the purpose of this Urban Water Management Plan (UWMP). It also describes how the UWMP is organized and how it relates to other local and regional planning efforts that the City is involved in.

IN THIS SECTION
• Introduction for City
• California Water Code
• UWMP Organization
• UWMPs in Relation to Other
Efforts
• Funding Eligibility
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2025 Urban Water Management Plan- Draft | 1-2

1.1 Introduction for City
The City of Oxnard is a retail urban water supplier located in Ventura County on the Oxnard Plain. Through its Public Works Department, the City provides potable water service to residential, commercial, industrial, institutional, irrigation, and other customer classes within its water service area. The City also manages recycled water and wastewater systems that support broader water resource planning efforts.

The City’s water service area is not identical to the City limits, and this Urban Water Management Plan evaluates water demands, supplies, and reliability based on the water service area served by the City. In 2025, the City served approximately 206,822 people through 44,621 metered potable connections and supplied approximately 22,977 acre-feet of potable water.

Oxnard relies on a diverse water supply portfolio that includes local groundwater, imported water, treated groundwater, and recycled water resources. This UWMP describes the City’s existing water system and planning assumptions and evaluates long-term water supply reliability under normal, single-dry-year, and multiple dry-year conditions.

The City operates under a council-manager form of government, with policy direction provided by the City Council and water system operations managed through the City’s Public Works Department.

1.2 California Water Code
In 1983, the State of California Legislature (Legislature) enacted the Urban Water Management Planning Act (UWMP Act). The law required an urban water supplier providing water for municipal purposes to more than 3,000 customers or serving more than 3,000 acre-feet per year (AFY) to adopt a UWMP every five years. This UWMP must demonstrate water supply reliability under both normal and drought conditions. The UWMP Act applies to wholesale and retail water suppliers.

Since the original UWMP Act was passed, it has undergone significant expansion. Prolonged droughts, groundwater overdraft, regulatory revisions, and changing climatic conditions affect the reliability of each water supplier as well as statewide water reliability overseen by California Department of Water Resources (DWR), the State Water Resources Control Board (SWRCB), and the Legislature. Accordingly, the UWMP Act has grown to address changing conditions.

The current requirements are found in Sections 10610-10656 and 10608 of the California Water Code (CWC).

DWR provides guidance for urban water suppliers by preparing an Urban Water Management Plan Guidebook 2025 (Guidebook) (California Department of Water Resources, 2026) , conducting workshops, developing tools, and providing program staff to help water suppliers prepare comprehensive and useful water management plans, implement water conservation programs, and understand the requirements of the CWC. Suppliers prepare their own UWMPs and submit them to DWR. DWR then reviews the plans to make sure they have addressed the 1318
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requirements; they submit a report to the Legislature summarizing the status of the plans for each five-year cycle. The Guidebook was used to complete this 2025 UWMP.

The purpose of this UWMP is for the City to evaluate long-term resource planning and establish management measures to ensure adequate water supplies are available to meet existing and future demands. The UWMP provides a framework to help water suppliers maintain efficient use of urban water supplies, promote conservation programs and policies, ensure that sufficient water supplies are available for future beneficial use, and provide a response mechanism during drought conditions or other water supply shortages.

The UWMP is a valuable planning tool used for multiple purposes, including:
• Providing a standardized methodology for water utilities to assess their water resource needs and availability.
• Serving as a resource to the community and other interested parties regarding water supply and demand, conservation, and other water-related information. • Providing a key source of information for cities and counties when evaluating proposed new developments and preparing regional long-range planning documents, such as city and county General Plans.
• Informing other regional and Statewide water planning efforts, such as Integrated Regional Water Management Plans and the California Water Plan.

CWC 10632 also includes requirements for suppliers to prepare a Water Shortage Contingency Plan (WSCP). The WSCP documents a supplier’s plans to manage and mitigate an actual water shortage condition, should one occur because of drought or other impacts on water supplies.

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