Brentwood City Council
February 10, 2026

Planning Survey Report Form, Revised July 2015
Golden eagle
As described in the HCP/NCCP, a USFWS/CDFW-approved biologist will identify potential active nests of golden eagle during the planning surveys. The HCP/NCCP considers numerous land cover types as suitable foraging habitat for this species, which forages over a wide variety of open habitats. The HCP/NCCP lists oak savannah and rock outcrop as suitable nesting land covers for this species (Table 3-9).

The project area and surrounding 0.5 miles were surveyed for suitable nesting habitat and inactive nests of this species. No stick nests in trees were observed that were large enough to support this species, and no rock outcrops or oak savannah land cover types were present in the vicinity. Large mature trees within 0.5 miles of the project site were documented and may have potential to support nesting of this species. However, development surrounding the project site may preclude Golden eagle from nesting within the vicinity of the site. Potential nesting habitat within 0.5 miles of the project is mapped in Figure 5c. Trees were considered potentially suitable if they were large, mature and were not completely surrounded by urban areas. The preferred nesting habitat of cliffs, rock outcrops, oak savannah and large isolated trees is not present within 0.5 miles of the project site and much of the area is likely too developed with too much human-activity to support nesting by this species. There is a low potential for this species to forage in the ruderal areas of the project site. Suitable prey species are present for this species, however, the surrounding development and active disturbance is likely to deter Golden eagle from foraging on the site.

One documented CNDDB occurrence of this species is located approximately five miles south of the project site, where a nest was observed in 1994 in blue oak savannah and grazed grassland habitat (Occ. No. 145; CDFW 2024).

Similar to this occurrence, other occurrences of this species in Contra Costa County occur on the slopes and foothills of Mount Diablo and are not documented in the low elevation areas similar to the project site. 9) Covered and No-Take Plants
Please check the applicable boxes in Table 2b based on the land cover types found in the project area. If suitable land cover types are present on site, surveys must be conducted using approved CDFW/USFWS methods during the appropriate season for identification of covered and no-take species (see page 6-9 of the ECCC HCP/NCCP). Reference populations of covered and no-take plants should be visited, where possible, prior to conducting surveys to confirm that the plant species is visible and detectable at the time surveys are conducted. In order to complete all the necessary covered and no-take plant surveys, spring, summer, and fall surveys may be required.

Planning Survey Report Form, Revised July 2015
Table 2b. Covered and No-Take Plant Species
Plant Species
(C) or No
Covered
-
Take (N) Cover Type
Associated Land
Known
Typical Habitat or Physical Conditions, if
Period
Typical Blooming
Suitable Land
Present
Cover Type
Adobe navarretia
(Navarretia nigelliformis ssp.
radians)
a
C Annual Grassland
Annual Grassland
Generally found on clay barrens in
b
Apr–Jun
No
Yes
(
Alkali milkvetch
Astragalus tener ssp. tener)
N
Seasonal wetland
Annual grassland
Alkali wetland
Alkali grassland
in soils with a slight to
Generally found in vernally moist habitat
strongly elevated
pH
Mar–Jun
No
Yes
(
Big tarplant
Blepharizonia plumosa)
C Annual grassland Elevation below 1500 feet
d most often on
Altamont Series or Complex soils
Jul–Oct
No
Yes
(Hesperolinon breweri
Brewer’s dwarf flax
)
C
Oak woodland
Oak savanna
Chaparral and scrub
Annual grassland
within a 500+ buffer from oak
Generally, restricted to grassland areas
woodland
and/or chaparral/scrub
d
May–Jul
No
Yes
(
Brittlescale
Atriplex depressa)
C
Alkali wetland
Alkali grassland
southeastern region of plan area
Solano soil series; generally found in
Restricted to soils of the Pescadero or
d
May–Oct
No
Yes
Caper-fruited tropidocarpum
(Tropidocarpum capparideum)
N Alkali grassland Mar–Apr
No
Yes
(
Contra Costa goldfields
Lasthenia conjugens)
N
Annual
Alkali wetland
Alkali grassland
grassland
Seasonal wetland
Generally found in vernal pools Mar–Jun
No
Yes
(Helianthella castanea
Diablo Helianthella
)
C
Oak woodland
Oak savanna
Chaparral and scrub Elevations generally above 650 feet d Mar–Jun
No
Yes
Diamond-petaled poppy
(Eschscholzia rhombipetala)
N Annual grassland Mar–Apr
No
Yes
Large-flowered fiddleneck
(Amsinckia grandiflora)
N Annual grassland Generally on clay soil Apr–May
No
Yes
(
Mount Diablo buckwheat
Eriogonum truncatum)
N
Chaparral and scrub
Annual grassland Ecotone of grassland and chaparral/scrub Apr–Sep No
Yes
Mount Diablo fairy-lantern
(Calochortus pulchellus)
C
Oak woodland
Oak savanna
Chaparral and scrub
Annual grassland
2,600
Elevations generally between 650 and
d
Apr–Jun
No
Yes
(
Mount Diablo Manzanita
Arctostaphylos auriculata)
C Chaparral and scrub
northern flanks of Mt. Diablo
1,860 feet; restricted to the eastern and
Elevations generally between 700 and
d and the
vicinity of Black Diamond Mines
Jan–Mar
No
Yes
(Delphinium recurvatum
Recurved larkspur
)
C
Alkali wetland
Alkali grassland Mar–Jun
No
Yes
Round-leaved filaree
(California macrophylla)
c
C Annual grassland Mar–May
No
Yes
(
San Joaquin spearscale
Extriplex joaquiniana)
e
C
Alkali wetland
Alkali grassland Apr–Oct
No
Yes
(Madia radiata
Showy madia
)
C
Oak woodland
Oak savanna
Annual grassland Primarily occupies open grassland or
grassland on edge of oak woodland
Mar–May
No
Yes
a
The species Navarretia nigelliformis subsp. nigelliformis is no longer considered to occur within Contra Costa County based on specimen annotations at the UC and Jepson Herbaria at the University of California Berkeley as well as the opinions of experts in the genus. This taxon is now recognized as Navarretia nigelliformis subsp. radians. Any subspecies of Navarretia nigelliformis encountered as a part of botanical surveys in support of a PSR should be considered as covered under this HCP/NCCP. b Habitat for the Navarretia nigelliformis subspecies that occurs within the inventory are is inaccurately described in the HCP/NCCP as vernal pools. The entity within the Inventory generally occupies clay c
barrens within Annual Grassland habitat, which is an upland habitat type.

From California Native Plant Society. 2007. Inventory of Rare and Endangered Plants (online edition, v7-07d). Sacramento, CA. Species may be identifiable outside of the typical blooming period; a professional botanist shall determine if a covered or no take plant occurs on the project site. Reference population of covered and no-take plants should be visited, where possible, prior to conducting surveys d
to confirm that the plant is visible and detectable at the time surveys are conducted.

See Species Profiles in Appendix D of the Final HCP/NCCP. Reference populations of covered and no-take plants should be visited, where possible, prior to conducting surveys to confirm that the plant species is visible and detectable at the time surveys are conducted. e
In the recent update to the Jepson eflora (JFP 2013) Atriplex joaquinana has been circumscribed and segregated into a new genus called Extriplex based on the work of Elizabeth Zacharias and Bruce Baldwin (2010). The etymology of the genus Extriplex means, “beyond or outside Atriplex”.

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Planning Survey Report Form, Revised July 2015
10) Results of Covered and No-Take Plant Species
Provide a written summary describing the results of the planning surveys conducted as required in Table 2b.

Describe the methods used to survey the site for all covered and no-take plants, including the dates and times of all surveys conducted (see Tables 3-8 and 6-5 of the ECCC HCP/NCCP for covered and no-take plants), including reference populations visited prior to conducting surveys.

If any covered or no-take plant species were found, include the following information in the results summary:
• Description and number of occurrences and their rough population size. • Description of the “health” of each occurrence, as defined on pages 5-49 and 5-50 of the HCP/NCCP. • A map of all the occurrences.
• Justification of surveying time window, if outside of the plant’s blooming period. • The CNDDB form(s) submitted to CDFW (if this is a new occurrence). • A description of the anticipated impacts that the covered activity will have on the occurrence and how the project will avoid impacts to all covered and no-take plant species. If impacts to covered plant species cannot be avoided and plants will be removed by covered activity, the Conservancy must be notified and has the option to salvage the covered plants. All projects must demonstrate avoidance of all six no-take plants (see table 6-5 of the HCP/NCCP).

None of the covered or no-take plant species were determined to have a potential to occur on the project site due to lack of suitable land cover types. None of the covered and no-take plant species are associated with the ruderal and urban land cover types that are present within the project site.

Planning Survey Report Form, Revised July 2015
IV. SPECIES-SPECIFIC AVOIDANCE AND MINIMIZATION REQUIREMENTS Please complete and/or provide the following attachments:
1) Species-Specific Avoidance and Minimization for Selected Covered Wildlife Complete the following table and check the applicable box for covered species determined by the planning surveys.

Table 3. Summary of Applicable Preconstruction Surveys, Avoidance and Minimization, and Construction Monitoring Requirements10
Species Preconstruction Survey
Requirements
Avoidance and Minimization
Requirements Construction Monitoring Required Info in HCP San
Joaquin
kit fox
• On project footprint and 250-ft
radius, map all dens (>5 in.
diameter) and determine status
• Provide written survey results
to USFWS within 5 working
days after surveying
• Monitor dens
• Destroy unoccupied dens
• Discourage use of occupied (nonnatal) dens
• Establish exclusion zones ( >50 ft
for potential dens, and >100 ft for
known dens)
• Notify USFWS of occupied natal
dens
pp. 6-37
to 6-38
Western
burrowing
owl
• On project footprint and 500-ft
radius, identify and map all
owls and burrows, and
determine status
• Document use of habitat (e.g.
breeding, foraging)
While no suitable burrows were
present at the time of the
planning survey, California
ground squirrel burrows were
present and could become
suitable for burrowing owl by
the time of construction. The
presence of numerous CNDDB
records in the project vicinity
support conducting a
preconstruction survey for this
species as a precaution.
• Avoid occupied nests during
breeding season (Feb-Sep)
• Avoid occupied burrows during
nonbreeding season (Sep – Feb)
• Install one-way doors in occupied
burrow (if avoidance not possible)
• Monitor burrows with doors
installed
• Establish buffer zones (250 ft
around nests)
• Establish buffer zones (160 ft
around burrows)
pp. 6-39
to 6-41
Giant
garter
snake
• Delineate aquatic habitat up to
200 ft from water’s edge on
each side
• Document any occurrences
• Limit construction to Oct-May
• Dewater habitat April 15 – Sep 30
prior to construction
• Minimize clearing for construction
• Delineate 200 ft buffer around
potential habitat near construction
• Provide field report on monitoring
efforts
• Stop construction activities if
snake is encountered; allow snake
to passively relocate
• Remove temporary fill or debris
from construction site
• Mandatory training for
construction personnel
pp. 6-43
to 6-45
California
tiger
salamander
• Provide written notification to
USFWS and CDFW regarding
timing of construction and
likelihood of occurrence on site
• Allow agency staff to translocate
species, if requested
• None p. 6-45
California
red-legged
frog
• Provide written notification to
USFWS and CDFW regarding
timing of construction and
likelihood of occurrence on site
• Allow agency staff to translocate
species, if requested
• None p. 6-46
Covered
shrimp
• Establish presence/absence
• Document and evaluate use of
all habitat features (e.g. vernal
pools, rock outcrops)
• Establish buffer near construction
activities
• Prohibit incompatible activities
• Establish buffer around outer edge
of all hydric vegetation associated
with habitat (50 ft or immediate
watershed, whichever is larger)
• Mandatory training for
construction personnel
pp. 6-46
to 6-48
Townsend’s
big-eared
bat
• Establish presence/absence
• Determine if potential sites
were recently occupied (guano)
• Seal hibernacula before Nov
• Seal nursery sites before April
• None pp. 6-36
to 6-37
10 The requirements in this table are not comprehensive; they are detailed in the next section on the following page. □
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Planning Survey Report Form, Revised July 2015
• Delay construction near occupied
sites until hibernation or nursery
seasons are over
Swainson’s
hawk
• Determine whether potential
nests are occupied
Large trees within 1,000 feet of
the project site provide
potential nesting habitat for
this species.
• No construction within 1,000 ft of
occupied nests within breeding
season (March 15 - Sep 15)
• If necessary, remove active nest
tree after nesting season to
prevent occupancy in second year.
• Establish 1,000 ft buffer around
active nest and monitor
compliance (no activity within
established buffer)
pp. 6-41
to 6-43
Golden
Eagle
• Establish presence/absence of
nesting eagles
Large trees within 0.5 miles of
the project site provide
potential nesting habitat for
this species.
• No construction within ½ mile near
active nests (most activity late Jan
– Aug)
• Establish ½ mile buffer around
active nest and monitor
compliance with buffer
pp. 6-38
to 6-39

Planning Survey Report Form, Revised July 2015
2) Required Preconstruction Surveys, Avoidance and Minimization, and Construction Monitoring All preconstruction surveys shall be conducted in accordance with the requirements set forth in Section 6.4.3, Species-Level Measures, and Table 6-1 of the ECCC HCP/NCCP. Detailed descriptions of preconstruction surveys, avoidance and minimization, and construction monitoring applicable to each of the wildlife species in Table 3 are located below. Please remove the species-specific measures that do not apply to your project (highlight entire section and delete).

WESTERN BURROWING OWL
Preconstruction Surveys
Prior to any ground disturbance related to covered activities, a USFWS/CDFW- approved biologist will conduct a preconstruction survey in areas identified in the planning surveys as having potential burrowing owl habitat. The surveys will establish the presence or absence of western burrowing owl and/or habitat features and evaluate use by owls in accordance with CDFW survey guidelines (California Department of Fish and Game 1995).

On the parcel where the activity is proposed, the biologist will survey the proposed disturbance footprint and a 500- foot radius from the perimeter of the proposed footprint to identify burrows and owls. Adjacent parcels under different land ownership will not be surveyed. Surveys should take place near sunrise or sunset in accordance with CDFW guidelines. All burrows or burrowing owls will be identified and mapped. Surveys will take place no more than 30 days prior to construction. During the breeding season (February 1– August 31), surveys will document whether burrowing owls are nesting in or directly adjacent to disturbance areas. During the nonbreeding season (September 1–January 31), surveys will document whether burrowing owls are using habitat in or directly adjacent to any disturbance area. Survey results will be valid only for the season (breeding or nonbreeding) during which the survey is conducted.

Avoidance and Minimization and Construction Monitoring
This measure incorporates avoidance and minimization guidelines from CDFW’s Staff Report on Burrowing Owl Mitigation (California Department of Fish and Game 1995).

If burrowing owls are found during the breeding season (February 1 – August 31), the project proponent will avoid all nest sites that could be disturbed by project construction during the remainder of the breeding season or while the nest is occupied by adults or young. Avoidance will include establishment of a non-disturbance buffer zone (described below). Construction may occur during the breeding season if a qualified biologist monitors the nest and determines that the birds have not begun egg-laying and incubation or that the juveniles from the occupied burrows have fledged. During the nonbreeding season (September 1 – January 31), the project proponent should avoid the owls and the burrows they are using, if possible. Avoidance will include the establishment of a buffer zone (described below).

During the breeding season, buffer zones of at least 250 feet in which no construction activities can occur will be established around each occupied burrow (nest site). Buffer zones of 160 feet will be established around each burrow being used during the nonbreeding season. The buffers will be delineated by highly visible, temporary construction fencing.

If occupied burrows for burrowing owls are not avoided, passive relocation will be implemented. Owls should be excluded from burrows in the immediate impact zone and within a 160-foot buffer zone by installing one-way doors in burrow entrances. These doors should be in place for 48 hours prior to excavation. The project area should be monitored daily for 1 week to confirm that the owl has abandoned the burrow. Whenever possible, burrows should be excavated using hand tools and refilled to prevent reoccupation (California Department of Fish and Game 1995).

Plastic tubing or a similar structure should be inserted in the tunnels during excavation to maintain an escape route for any owls inside the burrow.

SWAINSON’S HAWK
Preconstruction Survey

Planning Survey Report Form, Revised July 2015
Prior to any ground disturbance related to covered activities that occurs during the nesting season (March 15– September 15), a qualified biologist will conduct a preconstruction survey no more than 1 month prior to construction to establish whether Swainson’s hawk nests within 1,000 feet of the project site are occupied. If potentially occupied nests within 1,000 feet are off the project site, then their occupancy will be determined by observation from public roads or by observations of Swainson’s hawk activity (e.g., foraging) near the project site. If nests are occupied, minimization measures and construction monitoring are required (see below).

Avoidance and Minimization and Construction Monitoring
During the nesting season (March 15–September 15), covered activities within 1,000 feet of occupied nests or nests under construction will be prohibited to prevent nest abandonment. If site-specific conditions or the nature of the covered activity (e.g., steep topography, dense vegetation, limited activities) indicate that a smaller buffer could be used, the Implementing Entity will coordinate with CDFW/USFWS to determine the appropriate buffer size.

If young fledge prior to September 15, covered activities can proceed normally. If the active nest site is shielded from view and noise from the project site by other development, topography, or other features, the project applicant can apply to the Implementing Entity for a waiver of this avoidance measure. Any waiver must also be approved by USFWS and CDFW. While the nest is occupied, activities outside the buffer can take place.

All active nest trees will be preserved on site, if feasible. Nest trees, including non-native trees, lost to covered activities will be mitigated by the project proponent according to the requirements below.

Mitigation for Loss of Nest Trees
The loss of non-riparian Swainson’s hawk nest trees will be mitigated by the project proponent by:
• If feasible on-site, planting 15 saplings for every tree lost with the objective of having at least 5 mature trees established for every tree lost according to the requirements listed below.

AND either
1) Pay the Implementing Entity an additional fee to purchase, plant, maintain, and monitor 15 saplings on the HCP/NCCP Preserve System for every tree lost according to the requirements listed below, OR 2) The project proponent will plant, maintain, and monitor 15 saplings for every tree lost at a site to be approved by the Implementing Entity (e.g., within an HCP/NCCP Preserve or existing open space linked to HCP/NCCP preserves), according to the requirements listed below.

The following requirements will be met for all planting options:
• Tree survival shall be monitored at least annually for 5 years, then every other year until year 12. All trees lost during the first 5 years will be replaced. Success will be reached at the end of 12 years if at least 5 trees per tree lost survive without supplemental irrigation or protection from herbivory. Trees must also survive for at least three years without irrigation.
• Irrigation and fencing to protect from deer and other herbivores may be needed for the first several years to ensure maximum tree survival.
• Native trees suitable for this site should be planted. When site conditions permit, a variety of native trees will be planted for each tree lost to provide trees with different growth rates, maturation, and life span, and to provide a variety of tree canopy structures for Swainson’s hawk. This variety will help to ensure that nest trees will be available in the short term (5-10 years for cottonwoods and willows) and in the long term (e.g., Valley oak, sycamore). This will also minimize the temporal loss of nest trees. • Riparian woodland restoration conducted as a result of covered activities (i.e., loss of riparian woodland) can be used to offset the nest tree planting requirement above, if the nest trees are riparian species. • Whenever feasible and when site conditions permit, trees should be planted in clumps together or with existing trees to provide larger areas of suitable nesting habitat and to create a natural buffer between nest trees and adjacent development (if plantings occur on the development site). • Whenever feasible, plantings on the site should occur closest to suitable foraging habitat outside the UDA. • Trees planted in the HCP/NCCP preserves or other approved offsite location will occur within the known range of Swainson’s hawk in the inventory area and as close as possible to high-quality foraging habitat.

Planning Survey Report Form, Revised July 2015

GOLDEN EAGLE
Preconstruction Survey
Prior to implementation of covered activities, a qualified biologist will conduct a preconstruction survey to establish whether nests of golden eagles are occupied (see Section 6.3.1, Planning Surveys). If nests are occupied, minimization requirements and construction monitoring will be required.

Avoidance and Minimization
Covered activities will be prohibited within 0.5 mile of active nests. Nests can be built and active at almost any time of the year, although mating and egg incubation occurs late January through August, with peak activity in March through July. If site-specific conditions or the nature of the covered activity (e.g., steep topography, dense vegetation, limited activities) indicate that a smaller buffer could be appropriate or that a larger buffer should be implemented, the Implementing Entity will coordinate with CDFW/USFWS to determine the appropriate buffer size.

Construction Monitoring
Construction monitoring will focus on ensuring that no covered activities occur within the buffer zone established around an active nest. Although no known golden eagle nest sites occur within or near the ULL, covered activities inside and outside of the Preserve System have the potential to disturb golden eagle nest sites. Construction monitoring will ensure that direct effects to golden eagles are minimized. 3) Construction Monitoring Plan
Before implementing a covered activity, the applicant will develop and submit a construction monitoring plan to the planning department of the local land use jurisdiction and the East Contra Costa County Habitat Conservancy for review and approval. Elements of a brief construction monitoring plan will include the following:
• Results of planning and preconstruction surveys.11
• Description of avoidance and minimization measures to be implemented, including a description of project-specific refinements to the measures or additional measures not included in the HCP/NCCP. • Description of monitoring activities, including monitoring frequency and duration, and specific activities to be monitored.
• Description of the onsite authority of the construction monitor to modify implementation of the activity.

Check box to acknowledge this requirement.
11 If the preconstruction surveys do not trigger construction monitoring, results of preconstruction surveys should still be submitted to the local jurisdiction and the East Contra Costa County Habitat Conservancy.
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Planning Survey Report Form, Revised July 2015
V. SPECIFIC CONDITIONS ON COVERED ACTIVITIES
1) Check off the HCP conservation measures that apply to the project.

APPLIES TO ALL PROJECTS
Conservation Measure 1.11. Avoid Direct Impacts on Extremely Rare Plants, Fully Protected Wildlife Species, or Migratory Birds. This conservation measure applies to all projects. All projects will avoid all impacts on extremely rare plants and fully protected species listed in Table 6-5 of the ECCC HCP/NCCP. See HCP pp. 6-23 to 6-25, and Table 6-5.

APPLIES TO PROJECTS THAT IMPACT COVERED PLANT SPECIES
Conservation Measure 3.10. Plant Salvage when Impacts are Unavoidable. This condition applies to projects that cannot avoid impacts on covered plants and help protect covered plants by prescribing salvage whenever avoidance of impacts is not feasible. Project proponents wishing to remove populations of covered plants must notify the Conservancy of their construction schedule to allow the Conservancy the option of salvaging the populations. See HCP pp. 6-48 to 6-50.

APPLIES TO PROJECTS THAT INCLUDE ARE ADJACENT TO STREAMS, PONDS, OR WETLANDS Conservation Measure 2.12. Wetland, Pond, and Stream Avoidance and Minimization. All projects will implement measures described in the HCP to avoid and minimize impacts on wetlands, ponds, streams, and riparian woodland/scrub. See HCP pp. 6-33 to 6-35.

APPLIES TO NEW DEVELOPMENT PROJECTS
Conservation Measure 1.10. Maintain Hydrologic Conditions and Minimize Erosion. All new development must avoid or minimize direct and indirect impacts on local hydrological conditions and erosion by incorporating the applicable Provision C.3 Amendments of the Contra Costa County Clean Water Program’s (CCCCWP’s) amended NPDES Permit (order no. R2-2003-0022; permit no. CAS002912). The overall goal of this measure is to ensure that new development covered under the HCP has no or minimal adverse effects on downstream fisheries to avoid take of fish listed under ESA or CESA. See HCP pp. 6-21 to 6-22.

APPLIES TO NEW DEVELOPMENT PROJECTS THAT INCLUDE OR ARE ADJACENT TO STREAMS, PONDS, OR WETLANDS Conservation Measure 1.7. Establish Stream Setbacks. A stream setback will be applied to all development projects covered by the HCP according to the stream types listed in Table 6-2 of the HCP. See HCP pp. 6-15 to 6-18 and Table 6-2.

APPLIES TO NEW DEVELOPMENT PROJECTS ADJACENT TO EXISTING PUBLIC OPEN SPACE, HCP PRESERVES, OR LIKELY HCP ACQUISITION SITES Conservation Measure 1.6. Minimize Development Footprint Adjacent to Open Space. Project applicants are encouraged to minimize their development footprint and set aside portions of their land to contribute to the HCP Preserve System. Land set aside that contributes to the HCP biological goals and objectives may be credited against development fees. See HCP pages 6-14 to 6-15.

Conservation Measure 1.8. Establish Fuel Management Buffer to Protect Preserves and Property. Buffer zones will provide a buffer between development and wildlands that allows adequate fuel management to minimize the risk of wildlife damage to property or to the preserve. The minimum buffer zone for new development is 100 feet. See HCP pages 6-18 to 6-19.

Conservation Measure 1.9. Incorporate Urban-Wildlife Interface Design Elements. These projects will incorporate design elements at the urban-wildlife interface to minimize the indirect impacts of development on the adjacent preserve. See HCP pp. 6-20 to 6-21.

APPLIES TO ROAD MAINTENANCE PROJECTS OUTSIDE THE UDA
Conservation Measure 1.12. Implement Best Management Practices for Rural Road Maintenance. Road maintenance activities have the potential to affect covered species by introducing sediment and other pollutants into downstream waterways, spreading invasive weeds, and disturbing breeding wildlife. In order to avoid and minimize these impacts, BMPs described in the HCP will be used where appropriate and feasible. See HCP pp. 6-25 to 6-26.

APPLIES TO NEW ROADS OR ROAD IMPROVEMENTS OUTSIDE THE UDA Conservation Measure 1.14. Design Requirements for Covered Roads Outside the Urban Development Area (UDA). New roads or road improvements outside the UDA have impacts on many covered species far beyond the direct impacts of their project footprints. To minimize the impacts of new, expanded, and improved roads in agricultural and natural areas of the inventory area, road and bridge construction projects will adopt siting, design, and construction requirements described in the HCP and listed in Table 6-6. See HCP pp. 6-27 to 6-33 and Table 6-6.

APPLIES TO FLOOD CONTROL MAINTENANCE ACTIVITIES
Conservation Measure 1.13. Implement Best Management Practices for Flood Control Facility Maintenance. Flood control maintenance activities have the potential to affect covered species by introducing sediment and other pollutants into downstream waterways and disturbing breeding wildlife. In order to avoid and minimize these impacts, BMPs described in the HCP will be used where appropriate and feasible. See HCP pp. 6-26 to 6-27.
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Planning Survey Report Form, Revised July 2015
2) For all checked conservation measures, describe how the project will comply with each measure.

Attach as Attachment C: Project Compliance to HCP Conditions.

VI. MITIGATION MEASURES
1) Mitigation Fee Calculator(s)
Complete and attach the fee calculator (use permanent and/or temporary impact fee calculator as appropriate), and attach as Attachment D: Fee Calculator(s). 2) Briefly describe the amount of fees to be paid and when applicant plans to submit payment.

Planning Survey Report Form, Revised July 2015
Attachment A
Project Description
East County Service Center
This project will provide a new integrated County Service Center for the residents of East County.

It will be convenient and accessible, and an anchor to the community offering a wide range of public services in an innovative, safe and welcoming environment. The building will house nine different County service groups in a three story, approximate 120,000 gross square foot building.

The entire site will be developed for a total of 339,535 square feet, to include new parking lots, sidewalks and roadways, pedestrian paving and plazas, with hard and planted landscaping.

Since this is an undeveloped site all utilities to include telecommunication cabling will have to be trenched and installed onto the property. The property will also include an emergency 250 kilowatt emergency generator and infrastructure for solar microgrid, bi-directional flow EV charging equipment, and other sustainable features such as high-performance HVAC systems and ground source heat pumps. These systems will exceed Cal Green Title 24 code requirements per County Building Design and Construction Guidelines, Division 01.01.D.

The construction of this project is anticipated to start in March of 2027 and finish up in September of 2028. It anticipated to be constructed in three phases starting with site preparation, which will include rough and fine grading, with trenching, utility and sustainable infrastructure installations.

Once site preparation is complete the building structure will be poured, formed and constructed.

With the final phase of construction completing the interior and exterior of the building.

ATTACHMENT A: PROJECT DESCRIPTION

ATTACHMENT B: FIGURES

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FIGURE 1
Project Vicinrty

Figure 2

lSl'IO Cove, fype
RUD : Ruaera1
- URS:Um.va
DU D EK , • ......... .;.:. " --a''~-
FIGURE3
Field-Verifid Land Cover Map
W:Co..my Sel\iet Cenier Atjecl

C
l'f 8!)
0 Project Bouncary
£-) Proto Pct"lt L-ocatlOO (m)
FIGURE<A
Photo Point Location Map

FIGURE 48 PHOTOLOG
SE s I SW
1:Kl IUO 210 2,0 2IC
• I • I • I • I • I • I • I • I • I • I • I • I • I • I 0202°S (T) @37' 56'41"N, 121'41'50"W ,:13ft & 71ft
Photo 1. Overview of nonheast edge of the project site facing south tOYtard oent-er of project site. Adjacent drive-through visible on left edge of frame.

DUO

NW I N NE
300 3;30 0 lO 60 • I •· I • I • I • I • I • I • I • I • I • I • I • I • I 0 352°N (T) @37' 56'41"N, 121' 41'50"W ,:13ft & 71ft
Photo 2. OVerv;ew of T edmology \Vay and adjacent propenies north of project site.
1S49S
JANUARY 202S
1

FIGURE 48 PHOTOLOG

SW W I NW
2,0 2,0 300 330
I • I • I • I • I • I • I • I • I • I • l • I • I • I • 0288'W (T) @37'56'41 "N, 121'41'50"W t 13ft A 72ft
"'-3. Overview of nonh edge of proSect site taken from nonheast oorner of project site facing west.

DUO
0 92'E (T) @37'56'39"N, 121'41'50"W ±13ft • 71ft . -
Photo 4. overview of northeast edge of project site facing east toward Brentwood Boulevard.
1S49S
JANUARY 2025
2

FIGURE 48 PHOTOLO G
SE l j SW
120 1::,0 1l J 210 240
• I • t • I • I • I • I • I • I • I • I • t • I • I • 1 0 181'S (T) @37'56'39"N, 121' 41'47"W :t13It " 68ft
Photo 5. Overview of east and south edges of the project site end ruclerel land oover type. Brentwood Boulevard is on the east side of the frame.

DUO

SW WI NW
210 240 2/C 300 330
• I • I • I • I • I • I • I • I • I • I • I • I • I • I 0 274'W (T) @37'56'39"N, 121'41'47"W z13It " 68ft
Photo 6. overview of northeast edge of project site facing west toward center of the site.
1S49S
JANUARY 2025
l

FIGURE 48 PHOTOLO G
NW ~, NE
300 330 ~ 30 80
• I • I • I • J • I • I • I • I • I • I • I • I • I • I 0 2'N (T) @37'56'37"N, 121' 41'47"W :t13ft & 69ft
"'-1. Qvel"Yiew of east edge of project site and ruderel lanclcover type taken from southeast comer of project site facing nonh.

DUO
SE s I SW
1:!0 l!-0 UtO 210 240 • • I • I • I • I • I • I • I • t • I • I • I • I • I • 0187'S (T) @37'56'37"N, 121'41'47"W %1311 & 70ft
Pllclo 8. overview of adjacent Pfoperty south of the Jlfcject site taken from southeast comer of project site.
15495
JANUARY 2025 '

FIGURE 48 PHOTOLOG

NW N I NE
00 330 0 30 60
I • I • I • I • I • I • J • I • I • I • I • t • I • I • 0 9'N (T) @37'56'37"N, 121' 41'51"W ±13ft .t. 71ft
Photo 9. Overview of the center of the project site taken from south edge of site facing north.

DUO
SW j W NW
210 240 2ro 300 3Jc
• I • I • I • I • I • I • I • I • I • I • I • I • I • I 0262'W (T) @37'56'40"N, 121'41'51"W t13ft .t. 69ft
Photo 10. Patch of ruderel vegetation growing near center of project site. 1S49S
JANUARY 2025
s

FIGURE 48 PHOTOLO G

SW 'IV NW
210 240 , 'O 300 330

NW NI NE
300 330 0 30 60
I • I • I • I • I • I • I • I • I • I • I • I • I • I • • l •l•I • l • l •l• l • l •l·l • l •t•l · I 0 269'W (T) @37'56'37"N, 121'41'54"W •13ft & 74ft O 3' N (T) @ 37'56'37"N, 121'41'57"W ±13ft & 73ft Photo 11. Rucleral vegetation patch growfog along south edge of project site. Photo 12. Overview of the west edge of the project site facing north.

DUO 1S49S
JANUARY 2025 •

FIGURE 48 PHOTOLO G
:so NE tlO !I 120 SE l !-0
• I • I • I • I • I • l • I • I • I • I • t • I • I • I 0 91'E (T) @37'56'40"N, 121'41'59"W ±19ft • 72ft
Photo 13. overview the urban land oover t)'pe in the northwest oorner of the project site. Photo facing east toward center of project DUO

NW N I NE
330 O 30 tlO
• I • I • I • I • I • I • I • I • I • I • I • I • I • I 0 11' N (T)@ 37'56'40"N, 121'41'59"W ±22ft • 78ft
Photo 1A. Overview the urban land cover type in the north,,est oomer of the project site. Photo faci~north toward Technology Way.
1S49S
JANUARY 2025
7

FIGURE 48 PHOTOLOG
N NE I E s
o ~ ~ oo 1m
l • l •l •l• I • l • l •l• l • J • l •l•I • I •
0 67'NE (T) @ 37'56'38"N, 121' 41'52"W •13ft & 71ft
Photo 1S. Representative photo of Celifornie ground squirrel burrow.

DUO
Photo 18. Representative photo of small mammal burrows on project site.

Burrows are typical of pocket gopher.
1S49S
JANUARY 2025 •

FIGURE 48 PHOTOLOG
SW jW NW
210 240 210 300 3:)1)
I • I • I • I • I • I • I • I • I • I • I • I • I • I • 0 266'W (T) @37'56'31"N, 121'41 '46"W •13ft .a. 68ft
"'-17. Potential Swainson·s hawk and raptor nesting habitat on edge of property south of project site.

DUO

NE I E SE
30 60 90 120
• I • I • I • I • t • I • I • I • I • I • I • I • I • I 0 72'E (T) @ 37'56'37"N, 121'41'54"W • 419ft .a. 80ft
Photo 1& Potential Swainson'$ hawk, golden eagte, and raptor nesting habitat on adjacent property east of project site. Photo taken from south end of Business Center Drive.
1S49S
JANUARY 2025 •

FIGURE 48 PHOTOLOG

SW WI NW
210 240 21'0 300 330
N jNE E
a o ~ ~ oo
I • I • I • I • I • I • I • I • I • I • t • I • I • I • I • I • I • I • I • I • I • I • I • I • I • I • I • I • I 0 276'W (T) @37'56'47"N, 121'42'3"W •13It J. 70ft O40'NE (T) @37'56'30"N, 121'42'8"W • 1311 J. 7811 "'-19, Potential Swainson·s hawk, golden eagle, and reptor nesting habitat Photo 20. Potential Swainson'$ hawk, golden eagte, end raptor nesting northwest of project site, south of Marsh Q-eek. habitat west or project s ite:. Photo tak~n rrom O'Hara Avenue.

DUO 1S49S
JANUARY 2025
10

l..J soo-1001 6 urrov.l'lg OM Hatltat A&&es.sirent Suter 0 Project Bounaary
~ Po:en:lal SlJl'JO'At"l!, Oo\l Ha)lta'!
Orcnard Plil'ltlngs·
DUDEK • ..........;;:. '~__:: .. ,_
FIGURE5A
Planning Survey Burrowing OvA Habitat Map
W:Co..ll!y~~CemerP,,:j«!

0 1,oco-ro01 S,,.....,600'6 trav.t HattatA.Uessmem aui:er 0 Project Bouooary
@ Po:en:131 swatnsoo'$ H~ ~Slt'lg Hallltai
• Po:en:131 S"'alnSOO'$ Hn8 ~&tt'lg Hallltai
Orcnard Plil'l!lng&•
DU DE K • ,.___ __ ,,. __.. ,..

FIGURE58
Planning Survey Swainson's Hawk Nesting Habitat Map
W:Co..ll!y~~CemerP,,:j«!

r.:1 tl2~11e GOltten E.g~ Habta.1A6Se&&ment Bu!l'er
0 Project Bouocary
@ Po:en:lal GdOen Ea~ NK 1ng Hal:lltat
• Po:en:lal GdOen Ea~ NK 1ng Habitat
Orcnard Plil'l!lng&•
DUDEK • ..........::: ..~ •!ff..

FIGURE SC
Planning Survey Golden Eagle Nesting Habitat Map
W:Co..ll!y~~CemerP,,:j«!

ATTACHMENT C: PROJECT COMPLIANCE TO HCP CONDITIONS

Attachment C
Project Compliance to HCP Conditions
Conservation Measure 1.11. Avoid Direct Impacts on Extremely Rare Plants, Fully Protected Wildlife Species, or Covered Migratory Birds
The project will avoid direct impacts on extremely rare plants, fully protected wildlife species and covered migratory birds.

Extremely Rare Plants
Results of the planning survey have identified no extremely rare plant species that would be expected to occur on the project site.

Fully Protected Wildlife
The HCP/NCCP lists four no-take, fully protected wildlife species in Table 6-5: white-tailed kite (Elanus leucurus), peregrine falcon (Falco peregrinus), golden eagle (Aquila chrysaetos), and ringtail (Bassariscus astutus). Planning surveys have determined that two of these species are not expected to occur on the project site: peregrine falcon and ringtail. Peregrine falcons nesting habitat includes cliffs and human-made structures such as bridges and tall buildings. No suitable peregrine falcon nesting habitat was documented within or in the vicinity of the project site during the planning surveys. Ringtails are not expected to occur within the project site due to lack of continuous woodland, forest or riparian areas. The planning survey report includes the results and avoidance measures for golden eagle.

White-Tailed Kite
White-tailed kites forage over open habitats. Potential foraging habitat for white-tailed kite occurs throughout the project site on the ruderal land cover type, where rodent prey species are abundant. This species typically nests in riparian areas adjacent to open spaces, often in dense deciduous trees or in isolated trees. Trees adjacent to the project site are suitable for nesting by this species. Avoidance of direct impacts on this species can be achieved through preconstruction surveys. Preconstruction surveys for Swainson’s hawk and golden eagle will simultaneously determine if white-tailed kite are nesting in the project vicinity. Avoidance measures for any active nests will follow the avoidance measures detailed in the below section “Nesting Birds”.

Nesting Birds
Nesting activity typically occurs from February through August. Disturbing or destroying active nests is a violation of the federal Migratory Bird Treaty Act. In addition, nests and eggs are protected under California Fish and Game Code Section 3503. To avoid direct impacts to nesting birds the following measures would be implemented.

• Tree and vegetation removal and initial ground disturbance at the project site will be conducted outside of the nesting season (February through September) as feasible. If not feasible, the following measures will be implemented to avoid or minimize impacts to nesting birds:
o A qualified biologist shall conduct a preconstruction survey for nesting birds no more than 7 days prior to vegetation or structure removal or ground-disturbing activities conducted during the nesting season (February through September). The survey shall cover the limits of construction and suitable nesting habitat within 1,000 feet for raptors and 100 feet for other nesting birds, as feasible and accessible. o If any active nests are observed during surveys, a qualified biologist shall establish a suitable avoidance buffer from the active nest. The buffer distance shall typically range from 50 to 500 feet and shall be determined based on factors such as the species of bird, topographic features, intensity and extent of the disturbance, timing relative to the nesting cycle, and anticipated ground-disturbance schedule. Limits of construction to avoid active nests shall be established in the field with flagging, fencing, or other appropriate barriers, and shall be maintained until the chicks have fledged and the nests are no longer active, as determined by the qualified biologist. o If vegetation removal activities are delayed, additional nest surveys shall be conducted such that no more than 7 days elapse between the survey and vegetation removal activities.
o If an active nest is identified in or adjacent to the construction zone after construction has started, work in the vicinity of the nest shall be halted until the qualified biologist can provide appropriate avoidance and minimization measures to ensure that the nest is not disturbed by construction. Appropriate measures may include a nodisturbance buffer until the birds have fledged and/or full-time monitoring by a qualified biologist during construction activities conducted near the nest.

Conservation Measure 1.10. Maintain Hydrologic Conditions and Minimize Erosion The project will maintain hydrologic conditions and minimize erosion to achieve the HCP/NCCP goal of limiting project impacts on downstream fisheries and avoid take of threatened and/or endangered fish species.

The following provisions from the C.3 Amendments of the Contra Costa County Clean Water Program’s (CCCCWP’s) were highlighted in the HCP/NCCP as applicable and relevant to projects covered under the HCP/NCCP. The project shall implement all relevant and feasible measures to ensure compliance with the HCP.
• Develop stormwater treatment controls such as detention basins sized, at a minimum, to treat runoff in accordance with the criteria provided in the Provisions. • Implement a verification program for treatment controls to ensure that all installed controls are being appropriately operated and maintained.

Control peak runoff flows and volumes by means of creation and implementation of a Hydrograph Modification Management Plan subject to Provision requirements. • Provide compensatory mitigation to the appropriate jurisdiction (i.e., city or County) for projects where meeting Provision requirements are physically impractical. • Limit the use of stormwater controls that function primarily as infiltration devices in order to protect groundwater quality and local stream hydrograph.

ATTACHMENT D: FEE CALCULATOR(S)

ECCC HCP /NCCP 2024 Fee Calculator Worksheet
Perman ent Impacts
PROJECT APPLICANT: Contra Costa County Public WOlb Oq,;,rtmcnt PROJECT NAME: C..st C-ty Service Ce,-ef Pro;ect
APN (s): 0 16410,008, 016-410.009, 016-4 t ().()10, 0 16-4U).011, Ot6--t10.012, 01 G-410..0ll. arid 016-120,024 JURISOICTl:OH: C011tta Costi County
OATt PREPARED: s"°=N=•=lc,, Lc,2.:02:S'------------------------- otvnOPMtHJ n :r
SC0 .-,proprbc1 c lty/COUflt)' Ofd fllll\U Of HCP/tiCCP ftr;ire '}, l t Od¢elltmlM f~ l.oM.

Wff\.ANO MITIGATION FU
lllt,$11.,..,;acu #II CNrpd bolt! J wlllllllld
fflltlplbi fee .-id .a d¢Yeb pmoMi fee.)
H.'c Zone 1
H.'c 2onc2
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fee Zone 4l
Riparia n woodl;mcl/Krub
Petcnni.11 Wetl;u,cl
Sea$0n.11 Wetlarid
Al.bi Wetl;irid
Ag~cn "°""' Watef
Slough/0,annef
PCRMAN[NT 2024FH/
lMPACTS (A(3 ACl!t: '
, .. , ' $20,.329.20

0.00 ' S40.6SU9

0.00 ' St0,164.GO

0.00 ' S.:30,493.80
De~ Ftt Toto/

0.000 ' S11l~7S.20

0.000 ' $ 11SJ:9l..S8

0.000 ' $412~16.09

0.000 ' S4t6.SU.83

0.000 ' S227.1l2.49

0.000 • SUl.616.78

0.000 ' $ 160.931174
•
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StS9,787..Sl
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s1u11•1.n
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$0.00
$0.00
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$0.00
S0.00
Strco1ms $: 25 ft (i11 lineat ft) 0 ' SS9S.22 • S0.00
Strco1ms ,. 25 ft (i11 lineat ft) 0 ' $891.29 • S0.00
STREAM Sn.ACK f.NCROACHMCNT
SH HCP/NCO Olillj:llet 6 (p. 6-lS (0 6-18) lor tnot• lnlo..

FUIUDUCTION
(ff rl!dool.w. ""81 W :i~rrwl!d ~ thll Msblit)I CMW:fV.Hlty.

Stit HCP/ NCCP Cbi:lpu1r 9 fo, mo,-Info.

RNAl fH WOJI.An::iN
Wdklr,d Mitigotioti Ftt Toto/ • $0.00
£nao«hmcnt 0.000 ' SS6.987.60 • $0.00
Streom Sttbod Encroochmfflt Ftt Toto/ • $0.00
l>cYelopn,,tr1t f.ec rt'itudion fcu land in lieu of fee : _____ _ ~ll!IOpmMt r:,~ tt'dut'tiOl'l fol pl'ffl'l::u1ent 8Sf:WIIISltS : ------ Wetland Mi tigation fet" reductiOl'l fof restor.ition/CTUtion : _____ _ llffludion Toto/ : ---~$0=.00"'-
0t'velopmcnt fet" TCIUII $1S9,787.Sl
Wt-tlandN'litig;itionf ttTCIUII + ---~'°'=oo=-
£naoachment kl Stru m St'tbKt f tt T OUII + ---~S0.=00=.

Mitigation Fee Total = su,., a,.s1
ContribU'!ion to R«oYery • + ------
TOTAL AMOUNT out = ~' - '~' -" ~,n_ u _1.!
' "'9 f • Sd,njlff it. ...,...i _,,..ollv (i,o i.,,_ !h.. - d> 1.S ol-" v,,o,). On-t,l,:,pn- f - . ,.. -'i""" .. _.. IIO • '-- 111 lh• O>Clicl .. W.h • Ho- P,ic,o ._.,. iHhl .. ct• C..111""' ,._ lll!aitlCPII. n. Wll!!l,i11! Mi!iflicl!. '-n. .,. ,djJ\1.i l«ellli'I t,e I Oil. hfty li11,--. 1 I" 1udl ii.telllutlld wflidl I lle a!lju.l\ fl• r.... • f • ton.• it. ftOI .,,_., 0 11 f"'wn .. 1 ol1i. t,0~ b .. ,.i.,. 10 dw r. - '.lliul,I,, .,. ,i...,. ft _...ct .dlt.i!io• loulff"'"°""""_,....,i.ctt.tp. t.111. ' f o-.. ..,_ • • ..,,oa ..,_Ila.._ o-=, .. _ ......, .. ct,., • .;...woo11 • ...i,---.,pc,lic:io _ _.""''.__,.,""..,._....,_"''-~io1•• _,.. .....,,,ct. 1,,,c1 _.....,....,. "-~*" 111'<'1'- • • ......,...,••••• •-llo.,.,..llitloiion.._ ,., • .,_ "-""""°' ....., .. .ru1-oiioll,0t ct• oiio11,G!«(tfOJN(X,O,op1• t .J.1). - .... ~ ... 1p.ii,1fnlili<il~• .. - i>.i 110IWJ .... _ .,,cl •lio•• -'"-.. ct - ~ ,..,..-1...tipliD11 f- , ........ ;...i;,,a - - ......,,_,.,il<0- 0,Clicl"'l • p0,i;.,,,. o1, ... _ .. of , .. il'ili•I , ,_,iioll,ol , .. '"'"' ..... po-ricn.ol ,,. - of ........... lic,n. .. , ..... .......,i IIO«)ftlrb-llO ·--,_....,. n,;,. . ...... "' . a i,. ct.w.......ii.,-,i.e...--• -..i _ _.. ,._o,.......,.,..,..,. .._,wv..,_,....,i.1...,Policvoctop1.i by 1"-0......wyCo.,.,n._. .,_-i-o..:-i.. I, 20"- u.,...e•M•...,,.Mll•

ATTACHMENT E: WETLAND DELINEATION (if applicable)
(Not Applicable)

Attachment C
Soil Investigation Report, Phase I Environmental Site
Assessment, Phase II Environmental Site Assessment,
and Peer Review of ACC Letter Regarding Management
of Pesticide-Containing Soils

1 24201‐01 Soil Investigation Report.fnl‐10/3/24
3 October 2024
24201‐01
Shravan Sundaram
County Project Manager
Environmental Services Division
Contra Costa County Public Works Department
255 Glacier Drive
Martinez, CA  94553
Subject: Soil Investigation Report, Proposed East County Service Center, Contra Costa County Project # WH429A, Brentwood, California
Dear Mr. Sundaram:

Baseline has prepared this Soil Investigation Report to document the soil sampling and analysis performed at the Proposed East County Service Center (project) located on Technology Way in Brentwood, California, identified by Assessor’s Parcel Numbers: 016‐410‐008, 016‐410‐009, 016‐410‐010, 016‐410‐011, 016‐410‐012, 016‐410‐013 (project site). The County acquired these parcels (totaling 2.83 acres) in 2011 from Gregory Ranch Office Investors LP to improve access to County services for East County residents. Based on our review of historical and recent aerial photos we understand that historical use of the project site and surrounding properties included agricultural uses, and the project site has remained undeveloped land with recent use of the western portion of the project site for construction staging. The entire project site and adjacent areas appear to have been used for growing field/row crops from at least 1949 through the 1990s. Arsenic‐based pesticides were commonly used in agriculture prior to the use organochlorine pesticides (OCPs) which were first introduced into California agriculture in 1944 and reached peak usage in the 1960s.1 Arsenic and OCPs are persistent in the environment, and according to guidelines from the Department for Toxic Substances Control (DTSC), the only pesticide class requiring analyses at agricultural properties are OCPs and the only heavy metal required for routine analyses at agricultural properties is arsenic.2 There are no known hazardous materials release sites on or adjacent to the project site identified on the State Water Resources Control Board’s GeoTracker database. Based on the historical agricultural use of the project site and surrounding properties, Baseline identified the 1 Department of Toxic Substances Control (DTSC), 2008. Interim Guidance for Sampling Agricultural Properties (Third Revision), August 7. 2 Ibid.
- BASID-TNE - ENVIRONME T'ALCON,SULTING

October 3, 2024

2 24201‐01 Soil Investigation Report.fnl
potential for agricultural contaminants such as arsenic and OCPs to be present in shallow soil at the project site. Baseline also evaluated soil for other contaminants that are typically required to be tested by landfills for acceptance of soil disposal, including Title 22 Metals, petroleum hydrocarbons, and volatile organic compounds (VOCs). The purpose of the soil investigation was to characterize the chemical quality of shallow soil at the project site and to compare the analytical results to published health‐based screening values for construction workers and for commercial/industrial direct exposure under the assumption that the future land use is a commercial building, and to compare analytical results to hazardous waste disposal thresholds.

SAMPLING AND ANALYSIS ACTIVITIES
On 5 August 2024, Baseline performed soil sampling activities at the project site. Eight borings (B‐1 through B‐8) were advanced to depths of approximately 2 to 2.5 feet below ground surface (bgs) at the project site at the locations shown on Figure 1. The number of borings met (and conservatively exceeded) the frequency of borings recommended in DTSC’s guidelines for evaluation of agricultural land, which recommends four borings for up to three acres.3 The borings were located at approximately even spacing across the project site as there was no reason to suspect that soil quality would vary significantly at any specific locations at the project site. Borings B‐1 and B‐2 were located in the western portion of the project site where the ground surface was observed to be covered with an approximately 6‐inch‐thick layer of gravel, and all other borings were located in areas that appeared undisturbed with mowed dry grass on the ground surface. Soil samples were collected from borings B‐1 and B‐2 at depths of approximately 0.5 to 1.0‐foot (at the soil surface just below the gravel layer) and from 2.0‐2.5 feet bgs. In all other borings soil samples were collected from depths of approximately 0.0‐0.5 feet bgs (at the soil surface) and 1.5‐2.0 feet bgs. The sample depths were selected because agricultural contaminants are typically limited to the near surface soils. Additionally, the sample depths are representative of the 24 to 36 inches of anticipated excavation depths for the project. The samples collected from similar depths in 4 adjacent borings were composited by the laboratory into 4‐point composite samples for analysis of select constituents, as described under Laboratory Analysis below. A total of four 4‐point composite samples (COMP‐1 through COMP‐4) were generated. Samples from borings B‐1 through B‐4 (in the western portion of the Site) were composited together and samples from borings B‐5 through B‐8 (in the eastern portion of the Site) were composited together. Samples COMP‐1 and COMP‐3 represent surface soil from the western and eastern portions, respectively, of the project site. Samples COMP‐2 and COMP‐4 represent slightly deeper soil (from approximately 1.5 to 2 feet below the soil surface) from the western and eastern portions, respectively, of the project site. The surface soil samples from each boring were also analyzed discretely for arsenic and OCPs, and select 3 Department of Toxic Substances Control (DTSC), 2008. Interim Guidance for Sampling Agricultural Properties (Third Revision), August 7.

BASELINE

ENVIRONMENTAL CONSULTING

October 3, 2024

3 24201‐01 Soil Investigation Report.fnl
deeper samples were analyzed discretely for OCPs, as described under Laboratory Analysis below.

Sampling Methods
All borings were advanced using a hand auger. Samples were collected from the desired depths by transferring soil cuttings from the hand auger into laboratory supplied glass jars. Samples were sealed, labeled with the project name, date and time of sample collection, sampler’s initials, and unique sample identification, placed in a cooler containing ice, and transported to a State‐certified analytical laboratory under chain‐of‐custody procedures. Excess soil cuttings were used to backfill the borings.

Laboratory Analysis
The surface soil sample from each boring was analyzed for OCPs by Environmental Protection Agency (EPA) Method 8081 and arsenic by EPA Methods 6010B. All 4 composite soil samples were analyzed for Title 22 Metals by EPA Methods 6010B and 7471A; total petroleum hydrocarbons (TPH) as gasoline (TPHg), diesel (TPHd), and motor oil (TPHmo) by EPA Method 8015B; and VOCs by EPA Method 8260B. The deeper samples from borings B4, B‐6, and B‐8 were also analyzed for OCPs based on the detection of elevated concentrations of OCPs (with respect to hazardous waste thresholds) in the shallower samples from these borings, as discussed further under Analytical Results, below.

Based on the total chromium concentrations in samples COMP‐2 through COMP‐4, analysis of soluble chromium was performed on these samples using the Waste Extraction Test (WET) Method for waste classification purpose.

ANALYTICAL RESULTS
The laboratory analytical results are discussed below and the laboratory report is provided in Appendix A. Analytical results for metals are presented in Table 1, and analytical results for OCPs are presented in Table 2. Concentrations of all other analytes including TPHg, TPHd, TPHmo, and VOCs are not presented in tables or discussed further below as these analytes were not detected above laboratory reporting limits with the exception of a very minor concentration of TPHmo (25 milligrams per kilogram [mg/kg]) detected in sample COMP‐1.

The analytical results presented in Tables 1 and 2 are compared to the Environmental Screening Levels (ESLs) for construction worker direct exposure (Construction Worker ESLs) and commercial/industrial direct exposure (Commercial ESLs) established by the San Francisco Bay Regional Water Quality Control Board (Regional Water Board);4 naturally occurring background concentrations for metals; and hazardous waste criteria as defined in California Code of Regulations Title 22, including: comparison of concentrations to Total Threshold Limit 4 Regional Water Board, 2019. Environmental Screening Levels, January.

BASELINE

ENVIRONMENTAL CONSULTING

October 3, 2024

4 24201‐01 Soil Investigation Report.fnl
Concentrations (TTLCs), Solubility Threshold Limit Concentrations (STLCs), Toxicity Characteristic Leaching Procedure (TCLP) thresholds, and trigger levels for soluble metals testing by the WET and TCLP methods.

Metals
Concentrations of arsenic ranging from 8.4 to 11 mg/kg were detected in all of the samples analyzed. The detected concentrations of arsenic exceed the Construction Worker ESL of 0.98 mg/kg and Commercial ESL of 0.31 mg/kg (Table 1). Naturally occurring background concentrations of arsenic commonly exceed ESLs. A master’s thesis document5 previously provided as supplemental information on the Regional Water Board’s website for ESLs indicates that the proposed upper estimate for background arsenic (99th percentile) within undifferentiated flatland soil of the San Francisco Bay Area is 11 mg/kg. Considering that the arsenic concentrations detected in samples from multiple depths across the project site were relatively consistent and were below or equal to the established background arsenic level of 11 mg/kg, it appears that the detected levels of arsenic in soil at the project site are naturally occurring..

Concentrations of total chromium ranging from 44 to 59 mg/kg were detected in all four of the composite samples. The total chromium concentrations exceeded the trigger level for WET Method analysis of 50 mg/kg (10 times the STLC of 5 milligrams per liter [mg/L]) in samples COMP‐2 through and COMP‐4 (59 mg/kg in all three samples). Concentrations of soluble chromium analyzed by the WET Method were not detected above the laboratory reporting limit in samples COMP‐2 through COMP‐4.

Concentrations of all other metals analyzed were either not detected above the laboratory reporting limits or were detected at concentrations below Construction Worker ESLs, Commercial ESL, solubility testing (WET and TCLP) trigger levels, and hazardous waste thresholds.

Organochlorine Pesticides
Concentration of OCPs including 4,4'‐DDD, 4,4'‐DDE, 4,4'‐DDT, toxaphene, and aldrin were detected in the soil samples analyzed (Table 2). The detected concentrations of OCPs were below their respective Commercial ESLs and Construction Worker ESLs. Concentrations of 4,4'‐ DDE which equal or exceed the TTLC of 1,000 micrograms per kilogram (µg/kg) were detected in samples B‐4:0.0‐0.5 (1,000 µg/kg), B‐6:0.0‐0.5 (1,200 µg/kg), and B‐8:0.0‐0.5 (1,100 µg/kg).

The TTLC of 1,000 µg/kg applies to the combined concentrations of 4,4'‐DDD, 4,4'‐DDE, and 5 Duverge, Dylan, 2011. Establishing Background Arsenic in Soil of the Urbanized San Francisco Bay Region, December. Available at:
https://www.waterboards.ca.gov/sanfranciscobay/water_issues/available_documents/2011_Arsenic_Background _Duverge.pdf

BASELINE

ENVIRONMENTAL CONSULTING

October 3, 2024

5 24201‐01 Soil Investigation Report.fnl
4,4'‐DDT, which were 1,270 µg/kg in sample B‐4:0.0‐0.5, 1,449 µg/kg in sample B‐6:0.0‐0.5, and 1,255 µg/kg in sample B‐8:0.0‐0.5.  The detected concentrations of OCPs in all other samples analyzed were below hazardous waste thresholds.

CONCLUSIONS AND RECOMMENDATIONS
Based on the findings discussed above, Baseline provides the following conclusions and recommendations regarding the chemical characterization of shallow soils for human health exposure and off‐site disposal.

Comparison to Commercial ESLs and Construction Worker ESLs The detected concentrations of arsenic exceed the Commercial ESL and Construction Worker ESL; however, the arsenic concentrations appear to be naturally occurring background levels.

No specific handling or disposal requirements are recommended based on the arsenic concentrations other than notifying the contractor of the soil investigation findings so that they can ensure that their workers have appropriate training and take appropriate health and safety precautions. Assuming the project site is developed with no exposed soil surfaces remaining, there would be no risk of exposure to arsenic in soil for future occupants of the project site. No other analytical results exceeded the Commercial and Construction Worker ESLs.

Waste Classifications for Soil Disposal and Re‐Use
Soil excavated from the western, north‐central, and northeastern portions of the project site (areas outside of the yellow boundary shown on Figure 1) should be classified as non‐hazardous waste for off‐site disposal purposes. Soil excavated from these areas could also be re‐used on the project‐site if the soil meets geotechnical requirements.

In the south‐central and southeastern portions of the project site, soil excavated from the ground surface to a depth of 1.5 feet bgs should be classified as California‐hazardous (or non‐ RCRA hazardous6) waste for off‐site disposal purposes based on the  analytical results for OCPs (concentrations of 4,4'‐DDE and the total concentrations of 4,4'‐DDE, 4,4'‐DDD, and 4,4'‐DDT) exceeding California hazardous waste criteria, as presented in Table 2 and on Figure 1.

No other analytical results (including for petroleum hydrocarbons, VOCs, and metals) exceeded hazardous waste criteria. Stockpiling and testing of soil excavated on the project site may be performed prior to off‐site disposal or on‐site re‐use to re‐evaluate the chemical quality and waste classification of the soil. The construction contractor should prepare a Soil Management Plan (SMP) which should outline how they will segregate, manage, test, re‐use, and dispose of soil generated from excavation and grading activities on the project site. The SMP should indicate that if soil exhibiting signs of potential contamination (e.g., staining or odors) is 6 Non‐RCRA hazardous waste refers to hazardous waste as defined under California law (CCR Title 22) which is not defined as hazardous waste under the Federal Resource Conservation and Recovery Act (RCRA).

BASELINE

ENVIRONMENTAL CONSULTING

October 3, 2024

6 24201‐01 Soil Investigation Report.fnl
encountered during construction, the potentially contaminated soil would be segregated and characterized for waste disposal.

Sincerely,
William Scott, PG No. 6104         Cem Atabek
Senior Hydrogeologist          Senior Environmental Engineer

FIGURE

24201-01 Figure 1 8/1/240
Figure 1
Boring Locations and Extent of Soil Classified as Hazardous Waste Proposed East County Service Center, Brentwood, California B-4B-3
B-2
B-1 B-5
B-6
B-7B-8
Technology Way
Business Center Drive
N
0 100 Feet
Legend
Boring LocationSite Boundary
Extent of Non-RCRA California-Hazardous Waste fromGround Surface to 1.5 Feet Below Ground Surface A • D
D

BASELINE

ENVIRONMENTAL CONSULTING

TABLES

Table 1: Analytical Results for Metals
East County Service CenterBrentwood, CA
Sample ID Boring Location
Sample Depths
(ft bgs)
Sample
Collection
Date
Antimony
Arsenic
Barium
Beryllium
Cadmium
Chromium
WET Chromium
(mg/L)
Cobalt
Copper
Lead
Mercury
Molybdenum
Nickel
Selenium
Silver
Thallium
Vanadium
Zinc
B‐1:0.5‐1.0 B‐1 0.5‐1.0 8/5/24 ‐‐ 8.4 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ B‐2:0.5‐1.0 B‐2 0.5‐1.0 8/5/24 ‐‐ 9.0 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ B‐3:0.0‐0.5 B‐3 0.0‐0.5 8/5/24 ‐‐ 9.8 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ B‐4:0.0‐0.5 B‐4 0.0‐0.5 8/5/24 ‐‐ 11 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ B‐5:0.0‐0.5 B‐5 0.0‐0.5 8/5/24 ‐‐ 10 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ B‐6:0.0‐0.5 B‐6 0.0‐0.5 8/5/24 ‐‐ 10 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ B‐7:0.0‐0.5 B‐7 0.0‐0.5 8/5/24 ‐‐ 9.5 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ B‐8:0.0‐0.5 B‐8 0.0‐0.5 8/5/24 ‐‐ 9.9 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ COMP‐1B‐1 through B‐4 0.0‐0.5 & 0.5‐1.0* 8/5/24 <3.0 10 220 0.63 <0.50 44 ‐‐ 13 36 10 <0.15 <0.99 44 <3.0 <0.50 <3.0 70 74 COMP‐2B‐1 through B‐4 1.5‐2.0 & 2.0‐2.5* 8/5/24 <2.9 10 260 0.62 <0.49 59 <0.30 16 46 10 <0.17 <0.97 62 <2.9 <0.49 <2.9 84 76 COMP‐3B‐5 through B‐8 0.0‐0.5 8/5/24 <2.9 10 270 0.65 <0.49 59 <0.30 16 46 11 <0.14 <0.98 60 <2.9 <0.49 <2.9 85 82 COMP‐4B‐5 through B‐8 1.5‐2.0 8/5/24 <2.9 9.5 260 0.55 <0.49 59 <0.30 17 46 8.5 0.18 <0.98 65 <2.9 <0.49 <2.9 73 72 Construction Worker Direct Exposure 50 0.98 3,000 27 51 530000 5 NA 28 14,000 160 44 1,800 86 1,700 1,800 3.5 470 110,000 Commercial/Industrial Direct Exposure 160 0.31 220,000 230 1,100 1,800,000 5 NA 350 47,000 320 190 5,800 11,000 5,800 5,800 12 5,800 350,000

0.60 11 4 509 1.3 0.36 122 NA 15 29 24 0.26 1.3 57 0.058 0.80 0.56 112 149 500 500 10,000 75 100 2,500 NA 8,000 2,500 1,000 20 3,500 2,000 100 500 700 2,400 5,000 WET Testing Trigger Level (10 X STLC) 150 50 1,000 7.5 10 50 NA 800 250 50 2.0 3,500 200 10 50 70 240 2,500 15 5.0 100 0.75 1.0 5.0 5.0 80 25 5.0 0.20 350 20 1.0 5.0 7.0 24 250 TCLP Testing Trigger Level (20 X TCLP) NE 100 2,000 NE 20 100 NA NE NE 100 4.0 NE NE 20 100 NE NE NE NE 5.0 100 NE 1.0 5.0 NA NE NE 5.0 0.20 NE NE 1.0 5.0 NE NE NE Notes:Units are mg/kg unless indicated otherwise.

Metals analyzed by Environmental Protection Agency methods 6010B and 7471A for mercury. ‐‐ = not analyzed.

Shaded values indicates concentration equal to or exceeding trigger level for WET solubility analysis. ft bgs = feet below ground surface. <## = compound not identified at or above the laboratory reporting limit of ##. mg/kg = milligram per kilogram. * Samples from borings B‐1 and B‐2 were collected from approximately 0.5‐1.0 and 2.0‐2.5 feet bgs due to the presence of approximately 6‐inches of gravel on the ground surface. mg/L = milligram per liter.

NE = not established.
1 ESLs = Environmental Screening Levels, San Francisco Bay Regional Water Quality Control Board, January 2019. NA = not applicable.2 Background = Average Background Concentrations of Trace and Major Elements in California Soils, Kearney Foundation of Soil Science, March 1996. TTLC = Total Threshold Limit Concentration.3 California and Federal Hazardous Waste [TTLC, STLC and TCLP]  ‐ California Code of Regulations Title 22. STLC = Solubility Threshold Limit Concentration.4 Establishing Background Arsenic in Soil of the Urbanized San Francisco Bay Region, Dylan Duverge, December 2011. WET = soluble metals by Waste Extraction Test.5 Indicates ESL for Chromium III as there are no screening levels established for total chromium. TCLP = Toxicity Characteristic Leaching Procedure.

TTLC = Total Threshold Limit Concentration.

Hazardous
Waste
Criteria 3
TCLP Threshold (mg/L)STLC (mg/L)TTLC
ESLs 1
Background 2
8/22/2024
-

Table 2: Analytical Results for Organochlorine Pesticides East County Service Center
Brentwood, CA
Sample ID
Sample Depths
(ft bgs) Sample Date 4,4'‐DDD 4,4'‐DDE 4,4'‐DDT
Total DDD+
DDE+DDT Toxaphene Aldrin
B‐1:0.5‐1.0 0.5‐1.0 8/5/24 <5.0 <5.0 <5.0 <5.0 <100 <5.0 B‐2:0.5‐1.0 0.5‐1.0 8/5/24 <5.0 11 <5.0 11 <100 <5.0
B‐3:0.0‐0.5 0.0‐0.5 8/5/24 <5.0 11 <5.0 11 <100 <5.0
B‐4:0.0‐0.5 0.0‐0.5 8/5/24 <5.0 1,000 270 1,270 1,300 6.1 B‐4:1.5‐2.0 1.5‐2.0 8/5/24 <5.0 77 <5.0 77 <100 <5.0
B‐5:0.0‐0.5 0.0‐0.5 8/5/24 <5.0 470 62 532 480 <5.0
B‐6:0.0‐0.5 0.0‐0.5 8/5/24 19 1,200 230 1,449 1,400 18
B‐6:1.5‐2.0 1.5‐2.0 8/5/24 <4.9 90 <4.9 90 <98 <4.9
B‐7:0.0‐0.5 0.0‐0.5 8/5/24 <5.0 15 <5.0 15 <99 <5.0
B‐8:0.0‐0.5 0.0‐0.5 8/5/24 15 1,100 140 1,255 770 <5.0
B‐8:1.5‐2.0 1.5‐2.0 8/5/24 <5.1 28 <5.1 28 <100 <5.1
12,000 8,300 8,500 NA 2,200 150
81,000 57,000 57,000 NA 14,000 1,000
1,000 5,000 1,400
Notes:

Units are micrograms per kilogram.

Samples were analyzed for organochlorine pesticides by U.S. Environmental Protection Agency Method 8081A. <xx = indicates constituent was not identified at or above the laboratory reporting limit of xx Shaded values exceed California Hazardous Waste criteria.

NA = not applicable.
ft bgs = feet below ground surface.

TTLC = Total Threshold Limit Concentration.

Other organochlorine pesticides that are not shown were not detected above laboratory reporting limits. See lab report. 1 ESLs = Environmental Screening Levels, San Francisco Bay Regional Water Quality Control Board, January 2019. 2 The TTLC applys to the combined concentrations of DDD, DDE, and DDT.

ESLs 1
California Hazardous Waste Criteria ‐ TTLC 1,000 2
Commercial/Industrial Direct Exposure
Construction Worker Direct Exposure
8/22/2024
-

APPENDIX A
Laboratory Report

Enthalpy Analytical
931 West Barkley Ave
Orange, CA 92868
(714) 771-6900
enthalpy.com
Lab Job Number : 513507
Report Level : II
Report Date : 08/20/2024
Analytical Report prepared for:

Cem Atabek
Baseline Environmental
388 17th St
Suite 230
Oakland, CA 94612
Project: 24201-01 - East County Service Center
Miguel Gamboa, Project Coordinator
[email protected]
This data package has been reviewed for technical correctness and completeness. Release of this data has been authorized by the Laboratory Manager or the Manager's designee, as verified by the above signature which applies to this PDF file as well as any associated electronic data deliverable files. The results contained in this report meet all requirements of NELAP and pertain only to those samples which were submitted for analysis. This report may be reproduced only in its entirety.

CA ELAP# 1338, NELAP# 4038, SCAQMD LAP# 18LA0518, LACSD ID# 10105 Authorized for release by:
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A ALYTICAL

Sample Summary
Cem Atabek
Baseline
Environmental
388 17th St
Suite 230
Oakland, CA 94612
Lab Job #: 513507
Project No: 24201-01
Location: East County Service Center
Date Received: 08/05/24
Sample ID Lab ID Collected Matrix
B-1: 0.5-1.0 513507-001 08/05/24 11:50 Soil
B-1: 2.0-2.5 513507-002 08/05/24 11:58 Soil
B-2: 0.5-1.0 513507-003 08/05/24 11:10 Soil
B-2: 2.0-2.5 513507-004 08/05/24 11:15 Soil
B-3: 0.0-0.5 513507-005 08/05/24 12:25 Soil
B-3: 1.5-2.0 513507-006 08/05/24 12:32 Soil
B-4: 0.0-0.5 513507-007 08/05/24 12:45 Soil
B-4: 1.5-2.0 513507-008 08/05/24 12:51 Soil
B-5: 0.0-0.5 513507-009 08/05/24 13:16 Soil
B-5: 1.5-2.0 513507-010 08/05/24 13:20 Soil
B-6: 0.0-0.5 513507-011 08/05/24 13:30 Soil
B-6: 1.5-2.0 513507-012 08/05/24 13:35 Soil
B-7: 0.0-0.5 513507-013 08/05/24 14:01 Soil
B-7: 1.5-2.0 513507-014 08/05/24 14:05 Soil
B-8: 0.0-0.5 513507-015 08/05/24 13:47 Soil
B-8: 1.5-2.0 513507-016 08/05/24 13:51 Soil
COMP-1 513507-017 08/05/24 00:00 Soil
COMP-2 513507-018 08/05/24 00:00 Soil
COMP-3 513507-019 08/05/24 00:00 Soil
COMP-4 513507-020 08/05/24 00:00 Soil
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HA y

ANALYTICAL

Case Narrative
Baseline Environmental
388 17th St
Suite 230
Oakland, CA 94612
Cem Atabek
Lab Job
Number:
513507
Project No: 24201-01
Location: East County Service
Center
Date Received: 08/05/24
This data package contains sample and QC results for eleven soil samples and four four-point soil composites, requested for the above referenced project on 08/06/24. The samples were received cold and intact.

Report revised and reissued on 8-20-24 to include additional 8081 and STLC-Cr results.

TPH-Extractables by GC (EPA 8015M):

No analytical problems were encountered.

Volatile Organics by GC/MS (EPA 8260B):

Low recovery was observed for chlorobenzene in the MSD of COMP-1 (lab # 513507-017); the BS/BSD were within limits. High RPD was observed for a number of analytes in the MS/MSD of COMP-1 (lab # 513507-017); the RPD was acceptable in the BS/BSD, and these analytes were not detected at or above the RL in the associated samples.

No other analytical problems were encountered.

Pesticides (EPA 8081A):

High recoveries were observed for 4,4'-DDD in the MS/MSD for batch 346998; the parent sample was not a project sample, the LCS was within limits, and the associated RPD was within limits.

No other analytical problems were encountered.

Metals (EPA 6010B and EPA 7471A) Soil:

High response was observed for selenium in the CCV analyzed 08/07/24 15:03; affected data was qualified with "b".

Low recoveries were observed for antimony in the MS/MSD for batch 347000; the parent sample was not a project sample, the LCS was within limits, and the associated RPD was within limits.

No other analytical problems were encountered.

Metals (EPA 6010B) WET Leachate:

No analytical problems were encountered.
1 of 1
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•
•
•
•
•
•
•
•
A

ANALYTICAL

Cem Atabek
Baseline Environmental
388 17th St
Suite 230
Oakland, CA 94612
Lab Job #: 513507
Project No: 24201-01
Location: East County Service Center
Date Received: 08/05/24
Sample ID: B-1: 0.5-1.0 Lab ID: 513507-001 Collected: 08/05/24 11:50 Matrix: Soil
513507-001 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 8.4 mg/Kg 0.95
Sample ID: B-2: 0.5-1.0 Lab ID: 513507-003 Collected: 08/05/24 11:10 Matrix: Soil
513507-003 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 9.0 mg/Kg 0.97
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 11 ug/Kg 5.0
Sample ID: B-3: 0.0-0.5 Lab ID: 513507-005 Collected: 08/05/24 12:25 Matrix: Soil
513507-005 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 9.8 mg/Kg 1.0
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 11 ug/Kg 5.0
Sample ID: B-4: 0.0-0.5 Lab ID: 513507-007 Collected: 08/05/24 12:45 Matrix: Soil
513507-007 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 11 mg/Kg 0.98
Method: EPA 8081A
Prep Method: EPA 3546
Aldrin 6.1 C ug/Kg 5.0
4,4'-DDE 1,000 ug/Kg 50
4,4'-DDT 270 ug/Kg 5.0
Toxaphene 1,300 ug/Kg 1,000
1 of 5 v44.1
Detection Summary
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ANALYTICAL

Sample ID: B-4: 1.5-2.0 Lab ID: 513507-008 Collected: 08/05/24 12:51 Matrix: Soil
513507-008 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 77 # ug/Kg 5.0
Sample ID: B-5: 0.0-0.5 Lab ID: 513507-009 Collected: 08/05/24 13:16 Matrix: Soil
513507-009 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 10 mg/Kg 0.99
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 470 ug/Kg 25
4,4'-DDT 62 ug/Kg 5.0
Toxaphene 480 ug/Kg 100
Sample ID: B-6: 0.0-0.5 Lab ID: 513507-011 Collected: 08/05/24 13:30 Matrix: Soil
513507-011 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 10 mg/Kg 0.99
Method: EPA 8081A
Prep Method: EPA 3546
Aldrin 18 ug/Kg 5.0
4,4'-DDE 1,200 ug/Kg 50
4,4'-DDD 19 C ug/Kg 5.0
4,4'-DDT 230 ug/Kg 5.0
Toxaphene 1,400 ug/Kg 1,000
Sample ID: B-6: 1.5-2.0 Lab ID: 513507-012 Collected: 08/05/24 13:35 Matrix: Soil
513507-012 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 90 # ug/Kg 4.9
2 of 5 v44.1
Detection Summary
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ANALYTICAL

Sample ID: B-7: 0.0-0.5 Lab ID: 513507-013 Collected: 08/05/24 14:01 Matrix: Soil
513507-013 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 9.5 mg/Kg 0.97
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 15 C ug/Kg 5.0
Sample ID: B-8: 0.0-0.5 Lab ID: 513507-015 Collected: 08/05/24 13:47 Matrix: Soil
513507-015 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 9.9 mg/Kg 0.95
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 1,100 ug/Kg 50
4,4'-DDD 15 C ug/Kg 5.0
4,4'-DDT 140 ug/Kg 5.0
Toxaphene 770 ug/Kg 99
Sample ID: B-8: 1.5-2.0 Lab ID: 513507-016 Collected: 08/05/24 13:51 Matrix: Soil
513507-016 Analyte Result Qual Units RL
Method: EPA 8081A
Prep Method: EPA 3546
4,4'-DDE 28 # ug/Kg 5.1
3 of 5 v44.1
Detection Summary
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ANALYTICAL

Sample ID: COMP-1 Lab ID: 513507-017 Collected: 08/05/24 Matrix: Soil
513507-017 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 10 mg/Kg 0.99
Barium 220 mg/Kg 0.99
Beryllium 0.63 mg/Kg 0.50
Chromium 44 mg/Kg 0.99
Cobalt 13 mg/Kg 0.50
Copper 36 mg/Kg 0.99
Lead 10 mg/Kg 0.99
Nickel 44 mg/Kg 0.99
Vanadium 70 mg/Kg 0.99
Zinc 74 mg/Kg 5.0
Method: EPA 8015M
Prep Method: EPA 3580M
ORO C28-C44 25 mg/Kg 20
Sample ID: COMP-2 Lab ID: 513507-018 Collected: 08/05/24 Matrix: Soil
513507-018 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 10 mg/Kg 0.97
Barium 260 mg/Kg 0.97
Beryllium 0.62 mg/Kg 0.49
Chromium 59 mg/Kg 0.97
Cobalt 16 mg/Kg 0.49
Copper 46 mg/Kg 0.97
Lead 10 mg/Kg 0.97
Nickel 62 mg/Kg 0.97
Vanadium 84 mg/Kg 0.97
Zinc 76 mg/Kg 4.9
4 of 5 v44.1
Detection Summary
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ANALYTICAL

Sample ID: COMP-3 Lab ID: 513507-019 Collected: 08/05/24 Matrix: Soil
513507-019 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 10 mg/Kg 0.98
Barium 270 mg/Kg 0.98
Beryllium 0.65 mg/Kg 0.49
Chromium 59 mg/Kg 0.98
Cobalt 16 mg/Kg 0.49
Copper 46 mg/Kg 0.98
Lead 11 mg/Kg 0.98
Nickel 60 mg/Kg 0.98
Vanadium 85 mg/Kg 0.98
Zinc 82 mg/Kg 4.9
Sample ID: COMP-4 Lab ID: 513507-020 Collected: 08/05/24 Matrix: Soil
513507-020 Analyte Result Qual Units RL
Method: EPA 6010B
Prep Method: EPA 3050B
Arsenic 9.5 mg/Kg 0.98
Barium 260 mg/Kg 0.98
Beryllium 0.55 mg/Kg 0.49
Chromium 59 mg/Kg 0.98
Cobalt 17 mg/Kg 0.49
Copper 46 mg/Kg 0.98
Lead 8.5 mg/Kg 0.98
Nickel 65 mg/Kg 0.98
Vanadium 73 mg/Kg 0.98
Zinc 72 mg/Kg 4.9
Method: EPA 7471A
Prep Method: METHOD
Mercury 0.18 mg/Kg 0.16
#
CCV drift outside limits; average CCV drift within limits per method requirements
C Presence confirmed, but RPD between columns exceeds 40% 5 of 5 v44.1
Detection Summary
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ANALYTICAL

9 of 71 \
Baseline Environmental Consulting
388 17th Street, Suite 230
Oakland, CA 94612
Tel: (510) 420-8686
ProJect Number 24201-01 ProJect Name: East County Service Center Samplers: (Signatur~ l~frl,
p'
LAB
NO. Sample ID Date Time Media
B-1:~ r'J,C..-1 ,\l 8/ c;; /24 I :Sn Soil
B-1:......0"'J ,D-i .S' 8/ c; /24 l ~<;~ Soil
B-2: -.o.5 -1 ('j 8/ (' /24 : /) Soil
B-2: M-2.0 - 1... .C, 8/ S /24 ; c; Soil
B-3: 0.0-0.5 s/ C /24 : i{_ Soil
B-3: 1.5-2.0 8/ < /24 12! t~ Soil
8-4: 0.0-0.5 8/ < /24 , , _1,.4-1, Soil
B-4: 1.5-2.0 8/ S /24 1:.:Sf Soil
COMP-1
COMP-2
Relin~u·~ by:
1 ~ atui~e} _
· • ~ v 1 Vfl' ,
·/£11 '
Re~
Relinquished by: (Signature)
Cont ainers
Type
.,
i:
., > v\ ;;; 0 Q. g E "E
0 ;;; 0
z "' ,:. N
1 1
1 1 1 1 1 1 1 1 1 1 1 1
1 1
Date/Time
Date/Time
,,

CHAIN OF CUSTODY RECORD
LAB LOGIN S'°J3S°O--::/
a
.....
0 <D
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Date/Time Received by: (Sign(\)ll're) -
Received at laboratory with intact Samples conditions Comments:
custody seal Upon Arrival:

Yes No NA Intact On Ice Cold
ECSC Soil COC Page I of I
Turn-Around-Time Standard
-------------
. .
-
- -- --· - -
.
---- - -
..
·--
Laboratory _E_n_th_a_lp=--y=-,----------
Baseline Contact Person Cem Atabek
<t .,, .,,
a ---- 0.. C1J UJ "tJ >-C "' ,-.. - ·u .,, C1J ..... a a o N C ·;:; C1J ,:;;. 0 ..... .....
co :g .,, "tJ a. co 0 0 ,-.. <t u C1J ·u <D <D ai N 0.. 0 v a. :e iii <t a 0 = co UJ 0.. <t <t - ,-.. 0 C1J UJ 0.. ..... 0.. <D N C C1J UJ Notes 0 UJ N 0 co "tJ -~ ,:;;. 'ii, - <D - co ,:;;. !:' C <t C "tJ <: 0 E <t E <t >- C1J C1J 0.. C - E "' :c C1J ..... ·- N :, 0.. 0.. ,:;;. - ,:;;. UJ 1-- -"' co -o' :, UJ a. g -~ ..Q 0 .E UJ 'o -"' g o- - C1J - .,, 0 <t ,:;;. co .,, oii- ' "' u e <t "tJ "' N,:;;. ' ..... "' <t 0 <t , o C u ·c 0 - co J: N "' 0 i~ -q_ 0 0.. - 0.. - 0.. ,:;;. C1J "' > ,:;;. UJ 0 UJ 0.. 0 u -' > > ...:. V, -q 00 a!!: u - 0.. - 1-- co X COMP-1
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COMP-2, He+dX COMP-1 COMP-2, MeliL
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X X X X
Date/Time Remarks:
~/-5rt't 15~3 /
b/}vt 10: so
Email contact:
[email protected]

10 of 71
Baseline Environmental Consulting
388 17th Street, Suite 230
Oakland, CA 94612
Tel: (SlO) 420-8686
~OJect Number 24201-01
IIProJect Name: East County Service Center
r •mplers: (S1gnatu~ /<_-J!iLAB
NO.
p
Sample ID
B-5: 0.0-0.S
B-5: 1.5-2.0
B-6: 0.0-0.5
B-6: 1.5-2.0 B-7: 0.0-0. 5
B-7: 1.5-2.0 B-8: 0.0-0.5
B-8: 1.5-2.0
COMP-3
ICOMP-4
Date Time
1st 'f t24ll~
18/ <; /241.l.:t1.o
1st S- / 24~
fu::S 124113
IB/.,f;__ /24lllf:o1
1st S /24j 14', QJ 1st .h 1241 I J !!J
IBIS t2~.12_'._Sl
l~dlnatR.-)1 _
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Media
Soil Soil Soil Soil
Soil
Soil
II Soil
Soil
e
.
~.u.· 0 0
:.;_
1 1
1 1 1 I 1
1 I 1
1 I 1
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CHAIN OF CUSTODY RECORD
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custody seal
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ECSC
_
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Date/Time
Samples conditions
Upon Arrival:

Intact On Ice Cold
Received by: (Signal~)
[Comments:

Page I of I 2-
0 ..... 0 0 - N
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0 ..... ..... <{ 0 <O <O a,' N c.. 0 0 =«> w <{ <{ c.. ..... c.. <O - w 0 w N 0 - <O CX) C -
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Dalli?~
g/6/J-L{
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Laboratory Enthalpy
Baseline Contact Person Cem Atabek
<{ .,,
c.. V
w 'O
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0 a:; a.
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COMP-3
COMP-4,+tel!t
COMP-3 COMP-4,,i..le COMP-3
COMP-4,1-+eie
COMP-3 COMP-4,Jileld
X X
Remarks: Email contact:
[email protected]

11 of 71

SAMPLE RECEIPT CHECKLIST
Section 1: General Info ~ ~~ Date Received: fN, / --..1 '
Login # ~ S t3 ':>lJ-.J Client: ~ l:Nl HALPY
Section 2: Shipping/ Custody
Shipping Info: L
Are custody seals present? ci1:o D Yes cJ;,:f s, where? D on cooler, D on samples, D on package Custody seals intact on arrival? Yes □ No /A Date: # of seals D Signature D Initials Section 3: Condition / Packaging Important: Notify PM If ~ceeds &•c or arrive frozen Date Opened C JS /'lj By (print) 11-1, (sign) /\.
~mples received on ice directly from the field. Cooling process had begun. (if checked, skip temperatures) If no cooler: Sample Temp ("C):

How many coolers?~ Temp ("C): #1: #2: #3: #4: #5: #6:

Temperature measu~ed us' g D Thermometer ID: or IR Gun# 0 B DC Type of ice used : et, D Blue/Gel, D None Temperature blank(s) included? iz(Yes, □ No Section 4: Containers/ Labels/ Samples YES NO N/A
Were custody papers dry, filled out properly, and the project identifiable? ---L,..

Were Method 5035 sampling containers present? Transferred to freezer@: ,,...-- Did all containers arrive unbroken/unopened? /"'
Are there any missing/ extra samples? ,.,.,,.--
Are samples in the appropriate containers for indicated tests? .,,,,,,,,.,, Are sample labels present, in good condition and complete? Does the container count match the COC? ---- _/
Do the sample labels agree with custody papers? I/"'
Was sufficient amount of sample sent for tests requested? Did you change the hold time in LIMS for unpreserved VOAs? ---- ----- Did you change the hold time in LIMS for preserved terracores? ~ Are bubbles> 6mm present in VOA samples? / Was the client contacted about this delivery? Contacted: By: Date:

Section 5: Preservatives YES NO ---- N/A
Are the samples appropriately preserved? (if yes, skip the rest of section 5) / Did any samples/ containers require preservation upon receipt? Did you document your preservative check in the bench book? Preservative added:
0 H2SO4 lot# added to samples Date/Time
0 HCLlot# added to samples Date/Time
0 HNO3 lot# added to samples Date/Time
0 CrVI Buffer lot# added to samples Date/Time
Section 6: Explanations/ Comments
- (/)rfi1 n~ -.1{l)(f,-::J. lb< A...'+-.,,,n'71... f f ~ r ' /ArrJh<-\ - rl,ri,1 ~ MD'{) ,.., f}JWI A,.--i) ,,,. l -r' ,.,.~) .... ,."'- r~/ " ' \ ) ~~. --,_,
Date Logged SL-:;{~ By (print) """' (sign) -~ '
-----
Date Labeled ~-~-it.\ By (print) Io-Ji.-X£ieP:M (sign) AJA / - 7~ Enthalpy Analvtical - Berkeley Rev.15.1. 09/13/2019

12 of 71
Section 1
Client: Baseline Environmental
Date Received: 8/6/24
Section 2
.ENTHALPY

ANALYTICAL

SAMPLE ACCEPTANCE CHECKLIST
Project: East County Service Center
Sampler's Name Present: f71Yes n No
r71 n -r' 17
r-.?-
□
~· '?,{ ~ Sample Temp ("C) Sample(s) received in a cooler? tfJYes, How many~--- No (skip se !ion 2) (No Cooler): __ Sample Temp (
0 C), One from each cooler: #1: 2.6 #2: '5 · q #3: ____ #4: ____ _ (Acceptance range is < 6"C but not frozen (for Microbiology samples, occeptonce range is < 10"C but not frozen}. II· is acceptable for samples collected the some day as sample receipt to have o higher temperature as Jang as there is evidence that cooling /,as begun.) Shipping Information:

Section 3
Was the cooler packed with: [l]ice Packs IZ]Bubble Wrap O styrofoam Cooler Tern (°C : #1: 2.6
[l]1ce
O Paper None S n other _______ _
#2: 'tif"" #3: #4:

Section 4 YES
Was a COC received? ✓
Are sample IDs present? ✓
Are sampling dates & times present? ✓
Is a relinquished signature present? ✓
Are the tests required clearly indicated on the COC? ✓
Are custody seals present? ✓
If custody seals are present, were they intact? ✓
Are all samples sealed in plastic bags? (Recommended for Microbiology samples) Did all samples arrive intact? If no, indicate in Section 4 below. ✓ Did all bottle labels agree with COC? (ID, dates and times) ✓ Were the samples collected in the correct containers for the required tests? ✓ Are the containers labeled with the correct preservatives? Is there headspace in the VOA vials greater than 5-6 mm in diameter? Was a sufficient amount of sample submitted for the requested tests? ✓ NO N/A
✓
✓
✓
r;jb/M_
t?. ~ 5• Section 5 Explanations/ Comments
() '71 d .,,. G ~-S. rit 6/9-tf H:t"il!!'P"l:rmod 4 composite sample§, rtfv/:t, ,-sere+~ ~- { See Berkeley cooler sheet for discrepancies.

Section 6
For discrepancies, how was the Project Manager notified? O verbal O Email
PM Initials: _ _ Date/Time _ ___ _
(email sent to/on): __ / _____ _
Project Manager's response:

AUG C 6 2024
Enthal alytical, a subsidiary of Montrose Environment al Group ,Inc. 931 W. Barkley Ave, Orange, CA 921168 • T: (714) 771-6900 • F: (714) 538-1209 ,vww.enthalpy.com/soc"I
Sample Acceptance Checklist-Rev 4, 8/8/2017

13 of 71
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15 of 71
[External] - Re: 24201-01 - Enthalpy Data (513507)
Cem Atabek <[email protected]>
Mon 8/12/2024 5:30 PM
To:Miguel Gamboa <[email protected]>
Hi Miguel, please perform the following additional analysis on a normal TAT:
-Soluble chromium by the WET method for sampels COMP-2, COMP-3, and COMP-4. -OCPs for samples B-4:1.5-2.0, B-6:1.5-2.0, B-8:1.5-2.0 Thanks,
-Cem
Cem Atabek
Baseline Environmental Consulting
388 17th Street, Suite 230
Oakland, CA 94612
Direct: .(510) 588-7022
Cell: .(510) 541-7879
Mail: PO Box 18586, Oakland, CA 94619
WE ARE HIRING: htt12s://www.baseline-env.com/careers
This information is intended solely for use by the individual or entity named as the recipient hereof and may be an attorney work product that is privileged and confidential or it may contain confidential company information. If you are not the intended recipient, be aware that any disclosure, copying, distribution, or use of the contents of this transmission is prohibited. If you have received this communication in error, please notify us immediately by return e-mail and destroy this communication and all copies thereof, including attachments.

On Mon, Aug 12, 2024 at 4:20 PM Miguel Gamboa < [email protected] > wrote:

HiCem,
Please find attached the following files:
• PDF Deliverable
• Standard format+ MDL EDD (513507_standard-mdl.zip)
Miguel Gamboa
Project Coordinator
Enthalpy Analytical, LLC
2323 Fifth St., Berkeley, CA 94710

Field ID: COMP-1 Diln Fac: 1.000 Analyzed: 08/09/24
Type: SAMPLE Batch#: 347219 Prep: EPA 3580M
Lab ID: 513507-017 Sampled: 08/05/24 Analysis: EPA 8015M Matrix: Soil Received: 08/05/24 Analyst: KMB
Basis: as received Prepared: 08/08/24
513507-017 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 25 20 mg/Kg
513507-017 Surrogate %REC Limits
n-Triacontane 70 70-130
Field ID: COMP-2 Diln Fac: 1.000 Analyzed: 08/09/24
Type: SAMPLE Batch#: 347219 Prep: EPA 3580M
Lab ID: 513507-018 Sampled: 08/05/24 Analysis: EPA 8015M Matrix: Soil Received: 08/05/24 Analyst: KMB
Basis: as received Prepared: 08/08/24
513507-018 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 ND 20 mg/Kg
513507-018 Surrogate %REC Limits
n-Triacontane 98 70-130
Field ID: COMP-3 Diln Fac: 1.000 Analyzed: 08/09/24
Type: SAMPLE Batch#: 347219 Prep: EPA 3580M
Lab ID: 513507-019 Sampled: 08/05/24 Analysis: EPA 8015M Matrix: Soil Received: 08/05/24 Analyst: KMB
Basis: as received Prepared: 08/08/24
513507-019 Analyte Result RL Units
GRO C8-C10 ND 9.9 mg/Kg
DRO C10-C28 ND 9.9 mg/Kg
ORO C28-C44 ND 20 mg/Kg
513507-019 Surrogate %REC Limits
n-Triacontane 85 70-130
1 of 2 v28.001
Extractable Carbon Chain
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 16 of 71
HA .P

ANALYTICAL

Field ID: COMP-4 Diln Fac: 1.000 Analyzed: 08/09/24
Type: SAMPLE Batch#: 347219 Prep: EPA 3580M
Lab ID: 513507-020 Sampled: 08/05/24 Analysis: EPA 8015M Matrix: Soil Received: 08/05/24 Analyst: KMB
Basis: as received Prepared: 08/08/24
513507-020 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 ND 20 mg/Kg
513507-020 Surrogate %REC Limits
n-Triacontane 85 70-130
Type: BLANK Batch#: 347219 Analysis: EPA 8015M
Lab ID: QC1176423 Prepared: 08/08/24 Analyst: KMB
Matrix: Soil Analyzed: 08/08/24
Diln Fac: 1.000 Prep: EPA 3580M
QC1176423 Analyte Result RL Units
GRO C8-C10 ND 10 mg/Kg
DRO C10-C28 ND 10 mg/Kg
ORO C28-C44 ND 20 mg/Kg
QC1176423 Surrogate %REC Limits
n-Triacontane 78 70-130
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v28.001
Extractable Carbon Chain
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 17 of 71
HA .P

ANALYTICAL

Type: LCS Batch#: 347219 Analysis: EPA 8015M
Lab ID: QC1176424 Prepared: 08/08/24 Analyst: KMB
Matrix: Soil Analyzed: 08/08/24
Diln Fac: 1.000 Prep: EPA 3580M
QC1176424 Analyte Spiked Result %REC Limits Units
Diesel C10-C28 251.3 234.1 93 76-122 mg/Kg
QC1176424 Surrogate %REC Limits
n-Triacontane 84 70-130
1 of 1 v29
Extractable Carbon Chain: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 18 of 71
HA .P

ANALYTICAL

Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/08/24 Type: MS Diln Fac: 1.000 Analyzed: 08/08/24
MSS Lab ID: 513602-001 Batch#: 347219 Prep: EPA 3580M
Lab ID: QC1176425 Sampled: 07/25/24 Analysis: EPA 8015M Matrix: Soil Received: 08/08/24 Analyst: KMB
QC1176425 Analyte MSS Result Spiked Result %REC Limits Units Diesel C10-C28 <3.445 247.9 221.9 90 62-126 mg/Kg
QC1176425 Surrogate %REC Limits
n-Triacontane 79 70-130
Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/08/24 Type: MSD Diln Fac: 1.000 Analyzed: 08/08/24
MSS Lab ID: 513602-001 Batch#: 347219 Prep: EPA 3580M
Lab ID: QC1176426 Sampled: 07/25/24 Analysis: EPA 8015M Matrix: Soil Received: 08/08/24 Analyst: KMB
QC1176426 Analyte Spiked Result %REC Limits Units RPD Lim Diesel C10-C28 248.4 201.6 81 62-126 mg/Kg 10 35
QC1176426 Surrogate %REC Limits
n-Triacontane 71 70-130
Legend
RPD: Relative Percent
Difference
1 of 1 v30
Extractable Carbon Chain: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 19 of 71
HA .P

ANALYTICAL

Field ID: COMP-1 Batch#: 347040 Prep: EPA 5030B
Lab ID: 513507-017 Sampled: 08/05/24 Analysis: EPA 8260B Matrix: Soil Received: 08/05/24 Analyst: HMN
Diln Fac: 1.000 Analyzed: 08/07/24
513507-017 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v21
Purgeable Organics by GC/MS
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 20 of 71
HA .P

ANALYTICAL

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
513507-017 Analyte Result RL Units Basis
513507-017 Surrogate %REC Limits Basis
Dibromofluoromethane 100 70-145 as received
1,2-Dichloroethane-d4 105 70-145 as received
Toluene-d8 95 70-145 as received
Bromofluorobenzene 98 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v21
Purgeable Organics by GC/MS
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 21 of 71
HA .P

ANALYTICAL

Field ID: COMP-2 Batch#: 347040 Prep: EPA 5030B
Lab ID: 513507-018 Sampled: 08/05/24 Analysis: EPA 8260B Matrix: Soil Received: 08/05/24 Analyst: HMN
Diln Fac: 1.000 Analyzed: 08/07/24
513507-018 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v22
Purgeable Organics by GC/MS
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 22 of 71
HA .P

ANALYTICAL

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
513507-018 Analyte Result RL Units Basis
513507-018 Surrogate %REC Limits Basis
Dibromofluoromethane 97 70-145 as received
1,2-Dichloroethane-d4 102 70-145 as received
Toluene-d8 96 70-145 as received
Bromofluorobenzene 99 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v22
Purgeable Organics by GC/MS
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 23 of 71
HA .P

ANALYTICAL

Field ID: COMP-3 Batch#: 347040 Prep: EPA 5030B
Lab ID: 513507-019 Sampled: 08/05/24 Analysis: EPA 8260B Matrix: Soil Received: 08/05/24 Analyst: HMN
Diln Fac: 1.000 Analyzed: 08/07/24
513507-019 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v23
Purgeable Organics by GC/MS
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 24 of 71
HA .P

ANALYTICAL

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
513507-019 Analyte Result RL Units Basis
513507-019 Surrogate %REC Limits Basis
Dibromofluoromethane 106 70-145 as received
1,2-Dichloroethane-d4 113 70-145 as received
Toluene-d8 97 70-145 as received
Bromofluorobenzene 99 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v23
Purgeable Organics by GC/MS
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 25 of 71
HA .P

ANALYTICAL

Field ID: COMP-4 Batch#: 347040 Prep: EPA 5030B
Lab ID: 513507-020 Sampled: 08/05/24 Analysis: EPA 8260B Matrix: Soil Received: 08/05/24 Analyst: LYZ
Diln Fac: 1.000 Analyzed: 08/07/24
513507-020 Analyte Result RL Units Basis
Freon 12 ND 5.0 ug/Kg as received
Chloromethane ND 5.0 ug/Kg as received
Vinyl Chloride ND 5.0 ug/Kg as received
Bromomethane ND 5.0 ug/Kg as received
Chloroethane ND 5.0 ug/Kg as received
Trichlorofluoromethane ND 5.0 ug/Kg as received
Acetone ND 100 ug/Kg as received
Freon 113 ND 5.0 ug/Kg as received
1,1-Dichloroethene ND 5.0 ug/Kg as received
Methylene Chloride ND 20 ug/Kg as received
MTBE ND 5.0 ug/Kg as received
trans-1,2-Dichloroethene ND 5.0 ug/Kg as received
1,1-Dichloroethane ND 5.0 ug/Kg as received
2-Butanone ND 100 ug/Kg as received
cis-1,2-Dichloroethene ND 5.0 ug/Kg as received
2,2-Dichloropropane ND 5.0 ug/Kg as received
Chloroform ND 5.0 ug/Kg as received
Bromochloromethane ND 5.0 ug/Kg as received
1,1,1-Trichloroethane ND 5.0 ug/Kg as received
1,1-Dichloropropene ND 5.0 ug/Kg as received
Carbon Tetrachloride ND 5.0 ug/Kg as received
1,2-Dichloroethane ND 5.0 ug/Kg as received
Benzene ND 5.0 ug/Kg as received
Trichloroethene ND 5.0 ug/Kg as received
1,2-Dichloropropane ND 5.0 ug/Kg as received
Bromodichloromethane ND 5.0 ug/Kg as received
Dibromomethane ND 5.0 ug/Kg as received
4-Methyl-2-Pentanone ND 5.0 ug/Kg as received
cis-1,3-Dichloropropene ND 5.0 ug/Kg as received
Toluene ND 5.0 ug/Kg as received
trans-1,3-Dichloropropene ND 5.0 ug/Kg as received
1,1,2-Trichloroethane ND 5.0 ug/Kg as received
1,3-Dichloropropane ND 5.0 ug/Kg as received
Tetrachloroethene ND 5.0 ug/Kg as received
Dibromochloromethane ND 5.0 ug/Kg as received
1,2-Dibromoethane ND 5.0 ug/Kg as received
Chlorobenzene ND 5.0 ug/Kg as received
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg as received
Ethylbenzene ND 5.0 ug/Kg as received
m,p-Xylenes ND 10 ug/Kg as received
o-Xylene ND 5.0 ug/Kg as received
Styrene ND 5.0 ug/Kg as received
Bromoform ND 5.0 ug/Kg as received
Isopropylbenzene ND 5.0 ug/Kg as received
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg as received
1,2,3-Trichloropropane ND 5.0 ug/Kg as received
1 of 2 v24
Purgeable Organics by GC/MS
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 26 of 71
HA .P

ANALYTICAL

Propylbenzene ND 5.0 ug/Kg as received
Bromobenzene ND 5.0 ug/Kg as received
1,3,5-Trimethylbenzene ND 5.0 ug/Kg as received
2-Chlorotoluene ND 5.0 ug/Kg as received
4-Chlorotoluene ND 5.0 ug/Kg as received
tert-Butylbenzene ND 5.0 ug/Kg as received
1,2,4-Trimethylbenzene ND 5.0 ug/Kg as received
sec-Butylbenzene ND 5.0 ug/Kg as received
para-Isopropyl Toluene ND 5.0 ug/Kg as received
1,3-Dichlorobenzene ND 5.0 ug/Kg as received
1,4-Dichlorobenzene ND 5.0 ug/Kg as received
n-Butylbenzene ND 5.0 ug/Kg as received
1,2-Dichlorobenzene ND 5.0 ug/Kg as received
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg as received
1,2,4-Trichlorobenzene ND 5.0 ug/Kg as received
Hexachlorobutadiene ND 5.0 ug/Kg as received
Naphthalene ND 5.0 ug/Kg as received
1,2,3-Trichlorobenzene ND 5.0 ug/Kg as received
Xylene (total) ND 5.0 ug/Kg
513507-020 Analyte Result RL Units Basis
513507-020 Surrogate %REC Limits Basis
Dibromofluoromethane 106 70-145 as received
1,2-Dichloroethane-d4 112 70-145 as received
Toluene-d8 96 70-145 as received
Bromofluorobenzene 100 70-145 as received
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v24
Purgeable Organics by GC/MS
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 27 of 71
HA .P

ANALYTICAL

Type: BLANK Diln Fac: 1.000 Prep: EPA 5030B
Lab ID: QC1175881 Batch#: 347040 Analysis: EPA 8260B
Matrix: Soil Analyzed: 08/07/24 Analyst: HMN
QC1175881 Analyte Result RL Units
Freon 12 ND 5.0 ug/Kg
Chloromethane ND 5.0 ug/Kg
Vinyl Chloride ND 5.0 ug/Kg
Bromomethane ND 5.0 ug/Kg
Chloroethane ND 5.0 ug/Kg
Trichlorofluoromethane ND 5.0 ug/Kg
Acetone ND 100 ug/Kg
Freon 113 ND 5.0 ug/Kg
1,1-Dichloroethene ND 5.0 ug/Kg
Methylene Chloride ND 20 ug/Kg
MTBE ND 5.0 ug/Kg
trans-1,2-Dichloroethene ND 5.0 ug/Kg
1,1-Dichloroethane ND 5.0 ug/Kg
2-Butanone ND 100 ug/Kg
cis-1,2-Dichloroethene ND 5.0 ug/Kg
2,2-Dichloropropane ND 5.0 ug/Kg
Chloroform ND 5.0 ug/Kg
Bromochloromethane ND 5.0 ug/Kg
1,1,1-Trichloroethane ND 5.0 ug/Kg
1,1-Dichloropropene ND 5.0 ug/Kg
Carbon Tetrachloride ND 5.0 ug/Kg
1,2-Dichloroethane ND 5.0 ug/Kg
Benzene ND 5.0 ug/Kg
Trichloroethene ND 5.0 ug/Kg
1,2-Dichloropropane ND 5.0 ug/Kg
Bromodichloromethane ND 5.0 ug/Kg
Dibromomethane ND 5.0 ug/Kg
4-Methyl-2-Pentanone ND 5.0 ug/Kg
cis-1,3-Dichloropropene ND 5.0 ug/Kg
Toluene ND 5.0 ug/Kg
trans-1,3-Dichloropropene ND 5.0 ug/Kg
1,1,2-Trichloroethane ND 5.0 ug/Kg
1,3-Dichloropropane ND 5.0 ug/Kg
Tetrachloroethene ND 5.0 ug/Kg
Dibromochloromethane ND 5.0 ug/Kg
1,2-Dibromoethane ND 5.0 ug/Kg
Chlorobenzene ND 5.0 ug/Kg
1,1,1,2-Tetrachloroethane ND 5.0 ug/Kg
Ethylbenzene ND 5.0 ug/Kg
m,p-Xylenes ND 10 ug/Kg
o-Xylene ND 5.0 ug/Kg
Styrene ND 5.0 ug/Kg
Bromoform ND 5.0 ug/Kg
Isopropylbenzene ND 5.0 ug/Kg
1,1,2,2-Tetrachloroethane ND 5.0 ug/Kg
1,2,3-Trichloropropane ND 5.0 ug/Kg
Propylbenzene ND 5.0 ug/Kg
Bromobenzene ND 5.0 ug/Kg
1 of 2 v25
Purgeable Organics by GC/MS: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 28 of 71
HA .P

ANALYTICAL

1,3,5-Trimethylbenzene ND 5.0 ug/Kg
2-Chlorotoluene ND 5.0 ug/Kg
4-Chlorotoluene ND 5.0 ug/Kg
tert-Butylbenzene ND 5.0 ug/Kg
1,2,4-Trimethylbenzene ND 5.0 ug/Kg
sec-Butylbenzene ND 5.0 ug/Kg
para-Isopropyl Toluene ND 5.0 ug/Kg
1,3-Dichlorobenzene ND 5.0 ug/Kg
1,4-Dichlorobenzene ND 5.0 ug/Kg
n-Butylbenzene ND 5.0 ug/Kg
1,2-Dichlorobenzene ND 5.0 ug/Kg
1,2-Dibromo-3-Chloropropane ND 5.0 ug/Kg
1,2,4-Trichlorobenzene ND 5.0 ug/Kg
Hexachlorobutadiene ND 5.0 ug/Kg
Naphthalene ND 5.0 ug/Kg
1,2,3-Trichlorobenzene ND 5.0 ug/Kg
Xylene (total) ND 5.0 ug/Kg
QC1175881 Analyte Result RL Units
QC1175881 Surrogate %REC Limits
Dibromofluoromethane 105 70-130
1,2-Dichloroethane-d4 108 70-145
Toluene-d8 97 70-145
Bromofluorobenzene 98 70-145
Legend
ND: Not Detected
RL: Reporting Limit
2 of 2 v25
Purgeable Organics by GC/MS: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 29 of 71
HA .P

ANALYTICAL

Type: BS Diln Fac: 1.000 Prep: EPA 5030B
Lab ID: QC1175882 Batch#: 347040 Analysis: EPA 8260B
Matrix: Soil Analyzed: 08/07/24 Analyst: HMN
QC1175882 Analyte Spiked Result %REC Limits Units
1,1-Dichloroethene 50.00 51.03 102 70-131 ug/Kg
MTBE 50.00 50.16 100 69-130 ug/Kg
Benzene 50.00 50.68 101 70-130 ug/Kg
Trichloroethene 50.00 48.70 97 70-130 ug/Kg
Toluene 50.00 47.38 95 70-130 ug/Kg
Chlorobenzene 50.00 47.03 94 70-130 ug/Kg
QC1175882 Surrogate %REC Limits
Dibromofluoromethane 105 70-130
1,2-Dichloroethane-d4 107 70-145
Toluene-d8 97 70-145
Bromofluorobenzene 99 70-145
Type: BSD Diln Fac: 1.000 Prep: EPA 5030B
Lab ID: QC1175883 Batch#: 347040 Analysis: EPA 8260B
Matrix: Soil Analyzed: 08/07/24 Analyst: HMN
QC1175883 Analyte Spiked Result %REC Limits Units RPD Lim 1,1-Dichloroethene 50.00 44.07 88 70-131 ug/Kg 15 33
MTBE 50.00 43.45 87 69-130 ug/Kg 14 30
Benzene 50.00 43.76 88 70-130 ug/Kg 15 30
Trichloroethene 50.00 43.61 87 70-130 ug/Kg 11 30
Toluene 50.00 44.87 90 70-130 ug/Kg 5 30
Chlorobenzene 50.00 45.38 91 70-130 ug/Kg 4 30
QC1175883 Surrogate %REC Limits
Dibromofluoromethane 97 70-130
1,2-Dichloroethane-d4 97 70-145
Toluene-d8 97 70-145
Bromofluorobenzene 98 70-145
Legend
RPD: Relative Percent
Difference
1 of 1 v26
Purgeable Organics by GC/MS: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 30 of 71
HA .P

ANALYTICAL

Field ID: COMP-1 Basis: as received Analyzed: 08/07/24
Type: MS Diln Fac: 1.000 Prep: EPA 5030B
MSS Lab ID: 513507-017 Batch#: 347040 Analysis: EPA 8260B Lab ID: QC1175935 Sampled: 08/05/24 Analyst: HMN
Matrix: Soil Received: 08/05/24
QC1175935 Analyte MSS Result Spiked Result %REC Limits Units 1,1-Dichloroethene <0.9491 50.00 49.57 99 70-141 ug/Kg
MTBE <0.6119 50.00 48.04 96 59-130 ug/Kg
Benzene <0.8085 50.00 48.86 98 70-130 ug/Kg
Trichloroethene <0.8705 50.00 49.23 98 69-130 ug/Kg
Toluene <0.9600 50.00 49.78 100 70-130 ug/Kg
Chlorobenzene <0.7500 50.00 49.72 99 70-130 ug/Kg
QC1175935 Surrogate %REC Limits
Dibromofluoromethane 98 70-145
1,2-Dichloroethane-d4 101 70-145
Toluene-d8 98 70-145
Bromofluorobenzene 98 70-145
Field ID: COMP-1 Basis: as received Analyzed: 08/07/24
Type: MSD Diln Fac: 1.000 Prep: EPA 5030B
MSS Lab ID: 513507-017 Batch#: 347040 Analysis: EPA 8260B Lab ID: QC1175936 Sampled: 08/05/24 Analyst: HMN
Matrix: Soil Received: 08/05/24
QC1175936 Analyte Spiked Result %REC Limits Units RPD Lim 1,1-Dichloroethene 50.00 37.63 75 70-141 ug/Kg 27 43
MTBE 50.00 32.96 66 59-130 ug/Kg 37 * 30
Benzene 50.00 36.41 73 70-130 ug/Kg 29 30
Trichloroethene 50.00 34.70 69 69-130 ug/Kg 35 * 30
Toluene 50.00 36.07 72 70-130 ug/Kg 32 * 30
Chlorobenzene 50.00 34.63 69 * 70-130 ug/Kg 36 * 30
QC1175936 Surrogate %REC Limits
Dibromofluoromethane 97 70-145
1,2-Dichloroethane-d4 100 70-145
Toluene-d8 97 70-145
Bromofluorobenzene 99 70-145
Legend
*: Value is outside QC limits
RPD: Relative Percent
Difference
1 of 1 v27
Purgeable Organics by GC/MS: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 31 of 71
HA .P

ANALYTICAL

Field ID: B-1: 0.5-1.0 Batch#: 346998 Prep: EPA 3546
Lab ID: 513507-001 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: BLB
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-001 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE ND 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 10 ug/Kg
Toxaphene ND 100 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
513507-001 Surrogate %REC Limits
TCMX 81 23-120
Decachlorobiphenyl 68 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v31.002
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 32 of 71
HA .P

ANALYTICAL

Field ID: B-2: 0.5-1.0 Batch#: 346998 Prep: EPA 3546
Lab ID: 513507-003 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: BLB
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-003 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 11 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 10 ug/Kg
Toxaphene ND 100 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
513507-003 Surrogate %REC Limits
TCMX 82 23-120
Decachlorobiphenyl 67 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v32.002
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 33 of 71
HA .P

ANALYTICAL

Field ID: B-3: 0.0-0.5 Batch#: 346998 Prep: EPA 3546
Lab ID: 513507-005 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: BLB
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-005 Analyte Result RL Units
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 11 5.0 ug/Kg
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 10 ug/Kg
Toxaphene ND 100 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
513507-005 Surrogate %REC Limits
TCMX 82 23-120
Decachlorobiphenyl 65 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v33.002
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 34 of 71
HA .P

ANALYTICAL

Field ID: B-4: 0.0-0.5 Batch#: 346998 Prep: EPA 3546
Lab ID: 513507-007 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: MES
Basis: as received Prepared: 08/06/24
513507-007 Analyte Result RL Units Diln Fac Analyzed Qual alpha-BHC ND 5.0 ug/Kg 1.000 08/07/24
beta-BHC ND 5.0 ug/Kg 1.000 08/07/24
gamma-BHC ND 5.0 ug/Kg 1.000 08/07/24
delta-BHC ND 5.0 ug/Kg 1.000 08/07/24
Heptachlor ND 5.0 ug/Kg 1.000 08/07/24
Aldrin 6.1 5.0 ug/Kg 1.000 08/07/24 C
Heptachlor epoxide ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan I ND 5.0 ug/Kg 1.000 08/07/24
Dieldrin ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDE 1,000 50 ug/Kg 10.00 08/08/24
Endrin ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan II ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan sulfate ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDD ND 5.0 ug/Kg 1.000 08/07/24
Endrin aldehyde ND 5.0 ug/Kg 1.000 08/07/24
Endrin ketone ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDT 270 5.0 ug/Kg 1.000 08/07/24
Methoxychlor ND 10 ug/Kg 1.000 08/07/24
Toxaphene 1,300 1,000 ug/Kg 10.00 08/08/24
Chlordane (Technical) ND 50 ug/Kg 1.000 08/07/24
513507-007 Surrogate %REC Limits Diln Fac Analyzed
TCMX 84 23-120 1.000 08/07/24
Decachlorobiphenyl 68 24-120 1.000 08/07/24
Legend
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v34.001
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 35 of 71
HA .P

ANALYTICAL

Field ID: B-4: 1.5-2.0 Batch#: 347888 Prep: EPA 3546
Lab ID: 513507-008 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: MES
Basis: as received Prepared: 08/16/24
Diln Fac: 1.000 Analyzed: 08/18/24
513507-008 Analyte Result RL Units Qual
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 77 5.0 ug/Kg #
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 10 ug/Kg
Toxaphene ND 100 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
513507-008 Surrogate %REC Limits
TCMX 82 23-120
Decachlorobiphenyl 94 24-120
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
ND: Not Detected
RL: Reporting Limit
1 of 1 v47
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 36 of 71
HA .P

ANALYTICAL

Field ID: B-5: 0.0-0.5 Batch#: 346998 Prep: EPA 3546
Lab ID: 513507-009 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: MES
Basis: as received Prepared: 08/06/24
513507-009 Analyte Result RL Units Diln Fac Analyzed
alpha-BHC ND 5.0 ug/Kg 1.000 08/07/24
beta-BHC ND 5.0 ug/Kg 1.000 08/07/24
gamma-BHC ND 5.0 ug/Kg 1.000 08/07/24
delta-BHC ND 5.0 ug/Kg 1.000 08/07/24
Heptachlor ND 5.0 ug/Kg 1.000 08/07/24
Aldrin ND 5.0 ug/Kg 1.000 08/07/24
Heptachlor epoxide ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan I ND 5.0 ug/Kg 1.000 08/07/24
Dieldrin ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDE 470 25 ug/Kg 5.000 08/08/24
Endrin ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan II ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan sulfate ND 5.3 ug/Kg 1.000 08/07/24
4,4'-DDD ND 5.0 ug/Kg 1.000 08/07/24
Endrin aldehyde ND 5.0 ug/Kg 1.000 08/07/24
Endrin ketone ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDT 62 5.0 ug/Kg 1.000 08/07/24
Methoxychlor ND 10 ug/Kg 1.000 08/07/24
Toxaphene 480 100 ug/Kg 1.000 08/07/24
Chlordane (Technical) ND 50 ug/Kg 1.000 08/07/24
513507-009 Surrogate %REC Limits Diln Fac Analyzed
TCMX 81 23-120 1.000 08/07/24
Decachlorobiphenyl 67 24-120 1.000 08/07/24
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v35.001
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 37 of 71
HA .P

ANALYTICAL

Field ID: B-6: 0.0-0.5 Batch#: 346998 Prep: EPA 3546
Lab ID: 513507-011 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: MES
Basis: as received Prepared: 08/06/24
513507-011 Analyte Result RL Units Diln Fac Analyzed Qual alpha-BHC ND 5.0 ug/Kg 1.000 08/07/24
beta-BHC ND 5.0 ug/Kg 1.000 08/07/24
gamma-BHC ND 5.0 ug/Kg 1.000 08/07/24
delta-BHC ND 5.0 ug/Kg 1.000 08/07/24
Heptachlor ND 5.0 ug/Kg 1.000 08/07/24
Aldrin 18 5.0 ug/Kg 1.000 08/07/24
Heptachlor epoxide ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan I ND 5.0 ug/Kg 1.000 08/07/24
Dieldrin ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDE 1,200 50 ug/Kg 10.00 08/08/24
Endrin ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan II ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan sulfate ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDD 19 5.0 ug/Kg 1.000 08/07/24 C
Endrin aldehyde ND 5.0 ug/Kg 1.000 08/07/24
Endrin ketone ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDT 230 5.0 ug/Kg 1.000 08/07/24
Methoxychlor ND 10 ug/Kg 1.000 08/07/24
Toxaphene 1,400 1,000 ug/Kg 10.00 08/08/24
Chlordane (Technical) ND 50 ug/Kg 1.000 08/07/24
513507-011 Surrogate %REC Limits Diln Fac Analyzed
TCMX 83 23-120 1.000 08/07/24
Decachlorobiphenyl 65 24-120 1.000 08/07/24
Legend
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v36.001
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 38 of 71
HA .P

ANALYTICAL

Field ID: B-6: 1.5-2.0 Batch#: 347888 Prep: EPA 3546
Lab ID: 513507-012 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: MES
Basis: as received Prepared: 08/16/24
Diln Fac: 1.000 Analyzed: 08/18/24
513507-012 Analyte Result RL Units Qual
alpha-BHC ND 4.9 ug/Kg
beta-BHC ND 4.9 ug/Kg
gamma-BHC ND 4.9 ug/Kg
delta-BHC ND 4.9 ug/Kg
Heptachlor ND 4.9 ug/Kg
Aldrin ND 4.9 ug/Kg
Heptachlor epoxide ND 4.9 ug/Kg
Endosulfan I ND 4.9 ug/Kg
Dieldrin ND 4.9 ug/Kg
4,4'-DDE 90 4.9 ug/Kg #
Endrin ND 4.9 ug/Kg
Endosulfan II ND 4.9 ug/Kg
Endosulfan sulfate ND 4.9 ug/Kg
4,4'-DDD ND 4.9 ug/Kg
Endrin aldehyde ND 4.9 ug/Kg
Endrin ketone ND 4.9 ug/Kg
4,4'-DDT ND 4.9 ug/Kg
Methoxychlor ND 9.8 ug/Kg
Toxaphene ND 98 ug/Kg
Chlordane (Technical) ND 49 ug/Kg
513507-012 Surrogate %REC Limits
TCMX 84 23-120
Decachlorobiphenyl 94 24-120
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
ND: Not Detected
RL: Reporting Limit
1 of 1 v48
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 39 of 71
HA .P

ANALYTICAL

Field ID: B-7: 0.0-0.5 Batch#: 346998 Prep: EPA 3546
Lab ID: 513507-013 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: BLB
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-013 Analyte Result RL Units Qual
alpha-BHC ND 5.0 ug/Kg
beta-BHC ND 5.0 ug/Kg
gamma-BHC ND 5.0 ug/Kg
delta-BHC ND 5.0 ug/Kg
Heptachlor ND 5.0 ug/Kg
Aldrin ND 5.0 ug/Kg
Heptachlor epoxide ND 5.0 ug/Kg
Endosulfan I ND 5.0 ug/Kg
Dieldrin ND 5.0 ug/Kg
4,4'-DDE 15 5.0 ug/Kg C
Endrin ND 5.0 ug/Kg
Endosulfan II ND 5.0 ug/Kg
Endosulfan sulfate ND 5.0 ug/Kg
4,4'-DDD ND 5.0 ug/Kg
Endrin aldehyde ND 5.0 ug/Kg
Endrin ketone ND 5.0 ug/Kg
4,4'-DDT ND 5.0 ug/Kg
Methoxychlor ND 9.9 ug/Kg
Toxaphene ND 99 ug/Kg
Chlordane (Technical) ND 50 ug/Kg
513507-013 Surrogate %REC Limits
TCMX 76 23-120
Decachlorobiphenyl 57 24-120
Legend
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v37.002
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 40 of 71
HA .P

ANALYTICAL

Field ID: B-8: 0.0-0.5 Batch#: 346998 Prep: EPA 3546
Lab ID: 513507-015 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: MES
Basis: as received Prepared: 08/06/24
513507-015 Analyte Result RL Units Diln Fac Analyzed Qual alpha-BHC ND 5.0 ug/Kg 1.000 08/07/24
beta-BHC ND 5.0 ug/Kg 1.000 08/07/24
gamma-BHC ND 5.0 ug/Kg 1.000 08/07/24
delta-BHC ND 5.0 ug/Kg 1.000 08/07/24
Heptachlor ND 5.0 ug/Kg 1.000 08/07/24
Aldrin ND 5.0 ug/Kg 1.000 08/07/24
Heptachlor epoxide ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan I ND 5.0 ug/Kg 1.000 08/07/24
Dieldrin ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDE 1,100 50 ug/Kg 10.00 08/08/24
Endrin ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan II ND 5.0 ug/Kg 1.000 08/07/24
Endosulfan sulfate ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDD 15 5.0 ug/Kg 1.000 08/07/24 C
Endrin aldehyde ND 5.0 ug/Kg 1.000 08/07/24
Endrin ketone ND 5.0 ug/Kg 1.000 08/07/24
4,4'-DDT 140 5.0 ug/Kg 1.000 08/07/24
Methoxychlor ND 9.9 ug/Kg 1.000 08/07/24
Toxaphene 770 99 ug/Kg 1.000 08/07/24
Chlordane (Technical) ND 50 ug/Kg 1.000 08/07/24
513507-015 Surrogate %REC Limits Diln Fac Analyzed
TCMX 88 23-120 1.000 08/07/24
Decachlorobiphenyl 74 24-120 1.000 08/07/24
Legend
C: Presence confirmed, but RPD between columns exceeds 40% ND: Not Detected
RL: Reporting Limit
1 of 1 v38.001
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 41 of 71
HA .P

ANALYTICAL

Field ID: B-8: 1.5-2.0 Batch#: 347888 Prep: EPA 3546
Lab ID: 513507-016 Sampled: 08/05/24 Analysis: EPA 8081A Matrix: Soil Received: 08/05/24 Analyst: MES
Basis: as received Prepared: 08/16/24
Diln Fac: 1.000 Analyzed: 08/18/24
513507-016 Analyte Result RL Units Qual
alpha-BHC ND 5.1 ug/Kg
beta-BHC ND 5.1 ug/Kg
gamma-BHC ND 5.1 ug/Kg
delta-BHC ND 5.1 ug/Kg
Heptachlor ND 5.1 ug/Kg
Aldrin ND 5.1 ug/Kg
Heptachlor epoxide ND 5.1 ug/Kg
Endosulfan I ND 5.1 ug/Kg
Dieldrin ND 5.1 ug/Kg
4,4'-DDE 28 5.1 ug/Kg #
Endrin ND 5.1 ug/Kg
Endosulfan II ND 5.1 ug/Kg
Endosulfan sulfate ND 5.1 ug/Kg
4,4'-DDD ND 5.1 ug/Kg
Endrin aldehyde ND 5.1 ug/Kg
Endrin ketone ND 5.1 ug/Kg
4,4'-DDT ND 5.1 ug/Kg
Methoxychlor ND 10 ug/Kg
Toxaphene ND 100 ug/Kg
Chlordane (Technical) ND 51 ug/Kg
513507-016 Surrogate %REC Limits
TCMX 80 23-120
Decachlorobiphenyl 93 24-120
Legend
#: CCV drift outside limits; average CCV drift within limits per method requirements
ND: Not Detected
RL: Reporting Limit
1 of 1 v49
Organochlorine Pesticides
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 42 of 71
HA .P

ANALYTICAL

Type: BLANK Batch#: 346998 Analysis: EPA 8081A
Lab ID: QC1175787 Prepared: 08/06/24 Analyst: MES
Matrix: Soil Analyzed: 08/07/24
Diln Fac: 1.000 Prep: EPA 3546
QC1175787 Analyte Result RL Units
alpha-BHC ND 4.9 ug/Kg
beta-BHC ND 4.9 ug/Kg
gamma-BHC ND 4.9 ug/Kg
delta-BHC ND 4.9 ug/Kg
Heptachlor ND 4.9 ug/Kg
Aldrin ND 4.9 ug/Kg
Heptachlor epoxide ND 4.9 ug/Kg
Endosulfan I ND 4.9 ug/Kg
Dieldrin ND 4.9 ug/Kg
4,4'-DDE ND 4.9 ug/Kg
Endrin ND 4.9 ug/Kg
Endosulfan II ND 4.9 ug/Kg
Endosulfan sulfate ND 4.9 ug/Kg
4,4'-DDD ND 4.9 ug/Kg
Endrin aldehyde ND 4.9 ug/Kg
Endrin ketone ND 4.9 ug/Kg
4,4'-DDT ND 4.9 ug/Kg
Methoxychlor ND 9.8 ug/Kg
Toxaphene ND 98 ug/Kg
Chlordane (Technical) ND 49 ug/Kg
QC1175787 Surrogate %REC Limits
TCMX 84 23-120
Decachlorobiphenyl 89 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v39
Organochlorine Pesticides: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 43 of 71
HA .P

ANALYTICAL

Type: LCS Batch#: 346998 Analysis: EPA 8081A
Lab ID: QC1175788 Prepared: 08/06/24 Analyst: MES
Matrix: Soil Analyzed: 08/07/24
Diln Fac: 1.000 Prep: EPA 3546
QC1175788 Analyte Spiked Result %REC Limits Units
alpha-BHC 49.02 44.07 90 22-129 ug/Kg
beta-BHC 49.02 44.67 91 28-125 ug/Kg
gamma-BHC 49.02 44.29 90 22-128 ug/Kg
delta-BHC 49.02 46.80 95 24-131 ug/Kg
Heptachlor 49.02 41.53 85 18-124 ug/Kg
Aldrin 49.02 38.87 79 23-120 ug/Kg
Heptachlor epoxide 49.02 44.13 90 26-120 ug/Kg
Endosulfan I 49.02 46.50 95 25-126 ug/Kg
Dieldrin 49.02 46.90 96 23-124 ug/Kg
4,4'-DDE 49.02 46.25 94 28-121 ug/Kg
Endrin 49.02 44.14 90 25-127 ug/Kg
Endosulfan II 49.02 43.57 89 29-121 ug/Kg
Endosulfan sulfate 49.02 35.97 73 30-121 ug/Kg
4,4'-DDD 49.02 48.20 98 26-120 ug/Kg
Endrin aldehyde 49.02 28.70 59 10-120 ug/Kg
Endrin ketone 49.02 48.13 98 28-125 ug/Kg
4,4'-DDT 49.02 44.12 90 22-125 ug/Kg
Methoxychlor 49.02 50.76 104 28-130 ug/Kg
QC1175788 Surrogate %REC Limits
TCMX 87 23-120
Decachlorobiphenyl 94 24-120
1 of 1 v40
Organochlorine Pesticides: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 44 of 71
HA .P

ANALYTICAL

Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/06/24 Type: MS Diln Fac: 1.000 Analyzed: 08/07/24
MSS Lab ID: 513116-015 Batch#: 346998 Prep: EPA 3546
Lab ID: QC1175789 Sampled: 07/30/24 Analysis: EPA 8081A Matrix: Soil Received: 07/30/24 Analyst: MES
QC1175789 Analyte MSS Result Spiked Result %REC Limits Units alpha-BHC <2.330 50.00 44.46 89 46-120 ug/Kg
beta-BHC <2.591 50.00 43.92 88 41-120 ug/Kg
gamma-BHC <2.541 50.00 44.23 88 41-120 ug/Kg
delta-BHC <2.049 50.00 45.22 90 38-123 ug/Kg
Heptachlor 22.07 50.00 57.04 70 39-120 ug/Kg
Aldrin 11.39 50.00 47.30 72 34-120 ug/Kg
Heptachlor epoxide <2.518 50.00 35.07 70 43-120 ug/Kg
Endosulfan I <2.588 50.00 45.06 90 45-120 ug/Kg
Dieldrin 37.82 50.00 63.43 46 45-120 ug/Kg
4,4'-DDE 13.45 50.00 50.90 81 34-120 ug/Kg
Endrin <2.388 50.00 45.84 92 40-120 ug/Kg
Endosulfan II <2.539 50.00 45.58 91 41-120 ug/Kg
Endosulfan sulfate <5.269 50.00 38.55 77 42-120 ug/Kg
4,4'-DDD <1.963 50.00 77.19 154 * 41-120 ug/Kg
Endrin aldehyde <4.761 50.00 37.99 76 30-120 ug/Kg
Endrin ketone <2.551 50.00 48.47 97 45-120 ug/Kg
4,4'-DDT <2.652 50.00 50.31 101 35-127 ug/Kg
Methoxychlor <4.441 50.00 52.23 104 42-136 ug/Kg
QC1175789 Surrogate %REC Limits
TCMX 87 23-120
Decachlorobiphenyl 92 24-120
1 of 2 v41
Organochlorine Pesticides: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 45 of 71
HA .P

ANALYTICAL

Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/06/24 Type: MSD Diln Fac: 1.000 Analyzed: 08/07/24
MSS Lab ID: 513116-015 Batch#: 346998 Prep: EPA 3546
Lab ID: QC1175790 Sampled: 07/30/24 Analysis: EPA 8081A Matrix: Soil Received: 07/30/24 Analyst: MES
QC1175790 Analyte Spiked Result %REC Limits Units RPD Lim alpha-BHC 50.00 47.20 94 46-120 ug/Kg 6 30
beta-BHC 50.00 45.00 90 41-120 ug/Kg 2 30
gamma-BHC 50.00 46.81 94 41-120 ug/Kg 6 30
delta-BHC 50.00 47.09 94 38-123 ug/Kg 4 30
Heptachlor 50.00 67.46 91 39-120 ug/Kg 17 30
Aldrin 50.00 51.62 80 34-120 ug/Kg 9 30
Heptachlor epoxide 50.00 34.32 69 43-120 ug/Kg 2 30
Endosulfan I 50.00 45.77 92 45-120 ug/Kg 2 30
Dieldrin 50.00 81.78 83 45-120 ug/Kg 25 30
4,4'-DDE 50.00 53.31 86 34-120 ug/Kg 5 30
Endrin 50.00 47.16 94 40-120 ug/Kg 3 30
Endosulfan II 50.00 47.94 96 41-120 ug/Kg 5 30
Endosulfan sulfate 50.00 45.36 91 42-120 ug/Kg 16 30
4,4'-DDD 50.00 88.91 178 * 41-120 ug/Kg 14 30
Endrin aldehyde 50.00 41.02 82 30-120 ug/Kg 8 30
Endrin ketone 50.00 47.57 95 45-120 ug/Kg 2 30
4,4'-DDT 50.00 51.65 103 35-127 ug/Kg 3 30
Methoxychlor 50.00 53.51 107 42-136 ug/Kg 2 30
QC1175790 Surrogate %REC Limits
TCMX 92 23-120
Decachlorobiphenyl 91 24-120
Legend
*: Value is outside QC limits
RPD: Relative Percent
Difference
2 of 2 v41
Organochlorine Pesticides: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 46 of 71
HA .P

ANALYTICAL

Type: BLANK Batch#: 347888 Analysis: EPA 8081A
Lab ID: QC1178619 Prepared: 08/16/24 Analyst: MES
Matrix: Soil Analyzed: 08/17/24
Diln Fac: 1.000 Prep: EPA 3546
QC1178619 Analyte Result RL Units
alpha-BHC ND 4.9 ug/Kg
beta-BHC ND 4.9 ug/Kg
gamma-BHC ND 4.9 ug/Kg
delta-BHC ND 4.9 ug/Kg
Heptachlor ND 4.9 ug/Kg
Aldrin ND 4.9 ug/Kg
Heptachlor epoxide ND 4.9 ug/Kg
Endosulfan I ND 4.9 ug/Kg
Dieldrin ND 4.9 ug/Kg
4,4'-DDE ND 4.9 ug/Kg
Endrin ND 4.9 ug/Kg
Endosulfan II ND 4.9 ug/Kg
Endosulfan sulfate ND 4.9 ug/Kg
4,4'-DDD ND 4.9 ug/Kg
Endrin aldehyde ND 4.9 ug/Kg
Endrin ketone ND 4.9 ug/Kg
4,4'-DDT ND 4.9 ug/Kg
Methoxychlor ND 9.8 ug/Kg
Toxaphene ND 98 ug/Kg
Chlordane (Technical) ND 49 ug/Kg
QC1178619 Surrogate %REC Limits
TCMX 88 23-120
Decachlorobiphenyl 89 24-120
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v50
Organochlorine Pesticides: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 47 of 71
HA .P

ANALYTICAL

Type: LCS Batch#: 347888 Analysis: EPA 8081A
Lab ID: QC1178622 Prepared: 08/16/24 Analyst: MES
Matrix: Soil Analyzed: 08/17/24
Diln Fac: 1.000 Prep: EPA 3546
QC1178622 Analyte Spiked Result %REC Limits Units
alpha-BHC 51.02 55.83 109 22-129 ug/Kg
beta-BHC 51.02 56.78 111 28-125 ug/Kg
gamma-BHC 51.02 53.47 105 22-128 ug/Kg
delta-BHC 51.02 54.41 107 24-131 ug/Kg
Heptachlor 51.02 53.10 104 18-124 ug/Kg
Aldrin 51.02 46.18 91 23-120 ug/Kg
Heptachlor epoxide 51.02 53.47 105 26-120 ug/Kg
Endosulfan I 51.02 55.91 110 25-126 ug/Kg
Dieldrin 51.02 56.64 111 23-124 ug/Kg
4,4'-DDE 51.02 57.49 113 28-121 ug/Kg
Endrin 51.02 59.23 116 25-127 ug/Kg
Endosulfan II 51.02 58.10 114 29-121 ug/Kg
Endosulfan sulfate 51.02 59.47 117 30-121 ug/Kg
4,4'-DDD 51.02 55.44 109 26-120 ug/Kg
Endrin aldehyde 51.02 20.35 40 10-120 ug/Kg
Endrin ketone 51.02 59.15 116 28-125 ug/Kg
4,4'-DDT 51.02 53.08 104 22-125 ug/Kg
Methoxychlor 51.02 56.46 111 28-130 ug/Kg
QC1178622 Surrogate %REC Limits
TCMX 91 23-120
Decachlorobiphenyl 94 24-120
1 of 1 v51
Organochlorine Pesticides: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 48 of 71
HA .P

ANALYTICAL

Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/16/24 Type: MS Diln Fac: 1.000 Analyzed: 08/18/24
MSS Lab ID: 514081-030 Batch#: 347888 Prep: EPA 3546
Lab ID: QC1178625 Sampled: 08/14/24 Analysis: EPA 8081A Matrix: Soil Received: 08/14/24 Analyst: MES
QC1178625 Analyte MSS Result Spiked Result %REC Limits Units alpha-BHC <2.353 51.02 50.06 98 46-120 ug/Kg
beta-BHC <2.617 51.02 51.97 102 41-120 ug/Kg
gamma-BHC <2.566 51.02 49.48 97 41-120 ug/Kg
delta-BHC <2.070 51.02 49.47 97 38-123 ug/Kg
Heptachlor <2.349 51.02 53.89 106 39-120 ug/Kg
Aldrin <2.477 51.02 47.95 94 34-120 ug/Kg
Heptachlor epoxide <2.544 51.02 49.38 97 43-120 ug/Kg
Endosulfan I <2.614 51.02 50.25 98 45-120 ug/Kg
Dieldrin 6.245 51.02 49.93 86 45-120 ug/Kg
4,4'-DDE <3.176 51.02 52.79 103 34-120 ug/Kg
Endrin <2.412 51.02 53.88 106 40-120 ug/Kg
Endosulfan II <2.564 51.02 54.08 106 41-120 ug/Kg
Endosulfan sulfate <2.185 51.02 54.85 108 42-120 ug/Kg
4,4'-DDD <1.983 51.02 53.00 104 41-120 ug/Kg
Endrin aldehyde <4.809 51.02 45.24 89 30-120 ug/Kg
Endrin ketone <2.577 51.02 53.99 106 45-120 ug/Kg
4,4'-DDT 3.465 51.02 58.04 107 35-127 ug/Kg
Methoxychlor <4.486 51.02 58.78 115 42-136 ug/Kg
QC1178625 Surrogate %REC Limits
TCMX 84 23-120
Decachlorobiphenyl 88 24-120
1 of 2 v52
Organochlorine Pesticides: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 49 of 71
HA .P

ANALYTICAL

Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/16/24 Type: MSD Diln Fac: 1.000 Analyzed: 08/18/24
MSS Lab ID: 514081-030 Batch#: 347888 Prep: EPA 3546
Lab ID: QC1178626 Sampled: 08/14/24 Analysis: EPA 8081A Matrix: Soil Received: 08/14/24 Analyst: MES
QC1178626 Analyte Spiked Result %REC Limits Units RPD Lim alpha-BHC 49.02 45.60 93 46-120 ug/Kg 5 30
beta-BHC 49.02 46.46 95 41-120 ug/Kg 7 30
gamma-BHC 49.02 44.79 91 41-120 ug/Kg 6 30
delta-BHC 49.02 44.93 92 38-123 ug/Kg 6 30
Heptachlor 49.02 44.46 91 39-120 ug/Kg 15 30
Aldrin 49.02 43.23 88 34-120 ug/Kg 6 30
Heptachlor epoxide 49.02 44.80 91 43-120 ug/Kg 6 30
Endosulfan I 49.02 46.22 94 45-120 ug/Kg 4 30
Dieldrin 49.02 45.29 80 45-120 ug/Kg 6 30
4,4'-DDE 49.02 47.64 97 34-120 ug/Kg 6 30
Endrin 49.02 48.58 99 40-120 ug/Kg 6 30
Endosulfan II 49.02 49.24 100 41-120 ug/Kg 5 30
Endosulfan sulfate 49.02 47.70 97 42-120 ug/Kg 10 30
4,4'-DDD 49.02 47.35 97 41-120 ug/Kg 7 30
Endrin aldehyde 49.02 45.29 92 30-120 ug/Kg 4 30
Endrin ketone 49.02 47.99 98 45-120 ug/Kg 8 30
4,4'-DDT 49.02 52.45 100 35-127 ug/Kg 6 30
Methoxychlor 49.02 51.67 105 42-136 ug/Kg 9 30
QC1178626 Surrogate %REC Limits
TCMX 79 23-120
Decachlorobiphenyl 79 24-120
Legend
RPD: Relative Percent
Difference
2 of 2 v52
Organochlorine Pesticides: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 50 of 71
HA .P

ANALYTICAL

Field ID: B-1: 0.5-1.0 Batch#: 347000 Prep: EPA 3050B
Lab ID: 513507-001 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-001 Analyte Result RL Units
Arsenic 8.4 0.95 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v2
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 51 of 71
HA .P

ANALYTICAL

Field ID: B-2: 0.5-1.0 Batch#: 347000 Prep: EPA 3050B
Lab ID: 513507-003 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-003 Analyte Result RL Units
Arsenic 9.0 0.97 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v3
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 52 of 71
HA .P

ANALYTICAL

Field ID: B-3: 0.0-0.5 Batch#: 347000 Prep: EPA 3050B
Lab ID: 513507-005 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-005 Analyte Result RL Units
Arsenic 9.8 1.0 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v4
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 53 of 71
HA .P

ANALYTICAL

Field ID: B-4: 0.0-0.5 Batch#: 347000 Prep: EPA 3050B
Lab ID: 513507-007 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-007 Analyte Result RL Units
Arsenic 11 0.98 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v5
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 54 of 71
HA .P

ANALYTICAL

Field ID: B-5: 0.0-0.5 Batch#: 347000 Prep: EPA 3050B
Lab ID: 513507-009 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-009 Analyte Result RL Units
Arsenic 10 0.99 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v6
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 55 of 71
HA .P

ANALYTICAL

Field ID: B-6: 0.0-0.5 Batch#: 347000 Prep: EPA 3050B
Lab ID: 513507-011 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-011 Analyte Result RL Units
Arsenic 10 0.99 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v7
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 56 of 71
HA .P

ANALYTICAL

Field ID: B-7: 0.0-0.5 Batch#: 347000 Prep: EPA 3050B
Lab ID: 513507-013 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-013 Analyte Result RL Units
Arsenic 9.5 0.97 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v8
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 57 of 71
HA .P

ANALYTICAL

Field ID: B-8: 0.0-0.5 Batch#: 347000 Prep: EPA 3050B
Lab ID: 513507-015 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
Basis: as received Prepared: 08/06/24
Diln Fac: 1.000 Analyzed: 08/07/24
513507-015 Analyte Result RL Units
Arsenic 9.9 0.95 mg/Kg
Legend
RL: Reporting Limit
1 of 1 v9
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 58 of 71
HA .P

ANALYTICAL

Field ID: COMP-1 Basis: as received Received: 08/05/24
Lab ID: 513507-017 Diln Fac: 1.000
Matrix: Soil Sampled: 08/05/24
513507-017 Analyte Result RL Units Batch# Prepared Analyzed Prep Analysis Analyst Antimony ND 3.0 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Arsenic 10 0.99 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Barium 220 0.99 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Beryllium 0.63 0.50 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Cadmium ND 0.50 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Chromium 44 0.99 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Cobalt 13 0.50 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Copper 36 0.99 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Lead 10 0.99 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Mercury ND 0.15 mg/Kg 347106 08/07/24 08/08/24 METHOD EPA 7471A MLL Molybdenum ND 0.99 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Nickel 44 0.99 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Selenium ND 3.0 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Silver ND 0.50 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Thallium ND 3.0 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Vanadium 70 0.99 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Zinc 74 5.0 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v10.001
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 59 of 71
HA .P

ANALYTICAL

Field ID: COMP-2 Basis: as received Received: 08/05/24
Lab ID: 513507-018 Diln Fac: 1.000
Matrix: Soil Sampled: 08/05/24
513507-018 Analyte Result RL Units Batch# Prepared Analyzed Prep Analysis Analyst Antimony ND 2.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Arsenic 10 0.97 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Barium 260 0.97 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Beryllium 0.62 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Cadmium ND 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Chromium 59 0.97 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Cobalt 16 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Copper 46 0.97 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Lead 10 0.97 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Mercury ND 0.17 mg/Kg 347106 08/07/24 08/08/24 METHOD EPA 7471A MLL Molybdenum ND 0.97 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Nickel 62 0.97 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Selenium ND 2.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Silver ND 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Thallium ND 2.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Vanadium 84 0.97 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Zinc 76 4.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v11.001
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 60 of 71
HA .P

ANALYTICAL

Field ID: COMP-3 Basis: as received Received: 08/05/24
Lab ID: 513507-019 Diln Fac: 1.000
Matrix: Soil Sampled: 08/05/24
513507-019 Analyte Result RL Units Batch# Prepared Analyzed Prep Analysis Analyst Antimony ND 2.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Arsenic 10 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Barium 270 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Beryllium 0.65 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Cadmium ND 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Chromium 59 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Cobalt 16 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Copper 46 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Lead 11 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Mercury ND 0.14 mg/Kg 347106 08/07/24 08/08/24 METHOD EPA 7471A MLL Molybdenum ND 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Nickel 60 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Selenium ND 2.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Silver ND 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Thallium ND 2.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Vanadium 85 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Zinc 82 4.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v12.001
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 61 of 71
HA .P

ANALYTICAL

Field ID: COMP-4 Basis: as received Received: 08/05/24
Lab ID: 513507-020 Diln Fac: 1.000
Matrix: Soil Sampled: 08/05/24
513507-020 Analyte Result RL Units Batch# Prepared Analyzed Prep Analysis Analyst Antimony ND 2.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Arsenic 9.5 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Barium 260 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Beryllium 0.55 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Cadmium ND 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Chromium 59 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Cobalt 17 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Copper 46 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Lead 8.5 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Mercury 0.18 0.16 mg/Kg 347106 08/07/24 08/08/24 METHOD EPA 7471A MLL Molybdenum ND 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Nickel 65 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Selenium ND 2.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Silver ND 0.49 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Thallium ND 2.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Vanadium 73 0.98 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Zinc 72 4.9 mg/Kg 347000 08/06/24 08/07/24 EPA 3050B EPA 6010B DXC Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v13.001
Metals Analytical Report
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 62 of 71
HA .P

ANALYTICAL

Type: BLANK Batch#: 347000 Analysis: EPA 6010B
Lab ID: QC1175764 Prepared: 08/06/24 Analyst: DXC
Matrix: Soil Analyzed: 08/07/24
Diln Fac: 1.000 Prep: EPA 3050B
QC1175764 Analyte Result RL Units
Antimony ND 3.0 mg/Kg
Arsenic ND 1.0 mg/Kg
Barium ND 1.0 mg/Kg
Beryllium ND 0.50 mg/Kg
Cadmium ND 0.50 mg/Kg
Chromium ND 1.0 mg/Kg
Cobalt ND 0.50 mg/Kg
Copper ND 1.0 mg/Kg
Lead ND 1.0 mg/Kg
Molybdenum ND 1.0 mg/Kg
Nickel ND 1.0 mg/Kg
Selenium ND 3.0 mg/Kg
Silver ND 0.50 mg/Kg
Thallium ND 3.0 mg/Kg
Vanadium ND 1.0 mg/Kg
Zinc ND 5.0 mg/Kg
Legend
ND: Not Detected
RL: Reporting Limit
1 of 1 v14
Metals Analytical Report: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 63 of 71
HA .P

ANALYTICAL

Type: LCS Batch#: 347000 Analysis: EPA 6010B
Lab ID: QC1175765 Prepared: 08/06/24 Analyst: DXC
Matrix: Soil Analyzed: 08/07/24
Diln Fac: 1.000 Prep: EPA 3050B
QC1175765 Analyte Spiked Result %REC Limits Units Qual
Antimony 100.0 99.67 100 80-120 mg/Kg
Arsenic 100.0 103.8 104 80-120 mg/Kg
Barium 100.0 105.6 106 80-120 mg/Kg
Beryllium 100.0 106.3 106 80-120 mg/Kg
Cadmium 100.0 106.1 106 80-120 mg/Kg
Chromium 100.0 103.2 103 80-120 mg/Kg
Cobalt 100.0 111.6 112 80-120 mg/Kg
Copper 100.0 102.0 102 80-120 mg/Kg
Lead 100.0 110.1 110 80-120 mg/Kg
Molybdenum 100.0 103.2 103 80-120 mg/Kg
Nickel 100.0 110.2 110 80-120 mg/Kg
Selenium 100.0 101.2 101 80-120 mg/Kg b
Silver 50.00 48.31 97 80-120 mg/Kg
Thallium 100.0 112.4 112 80-120 mg/Kg
Vanadium 100.0 103.4 103 80-120 mg/Kg
Zinc 100.0 107.6 108 80-120 mg/Kg
Legend
b: See narrative
1 of 1 v15
Metals Analytical Report: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 64 of 71
HA .P

ANALYTICAL

Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/06/24 Type: MS Diln Fac: 1.000 Analyzed: 08/07/24
MSS Lab ID: 513455-001 Batch#: 347000 Prep: EPA 3050B
Lab ID: QC1175766 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
QC1175766 Analyte MSS Result Spiked Result %REC Limits Units Qual Antimony <1.173 98.04 24.08 25 * 75-125 mg/Kg
Arsenic 5.470 98.04 97.16 94 75-125 mg/Kg
Barium 175.2 98.04 287.6 115 75-125 mg/Kg
Beryllium 0.4388 98.04 98.09 100 75-125 mg/Kg
Cadmium 0.3798 98.04 94.01 96 75-125 mg/Kg
Chromium 36.14 98.04 131.4 97 75-125 mg/Kg
Cobalt 15.30 98.04 113.2 100 75-125 mg/Kg
Copper 14.29 98.04 113.6 101 75-125 mg/Kg
Lead 9.453 98.04 105.1 98 75-125 mg/Kg
Molybdenum 0.6001 98.04 82.45 83 75-125 mg/Kg
Nickel 23.54 98.04 119.4 98 75-125 mg/Kg
Selenium <0.8806 98.04 90.92 93 75-125 mg/Kg b
Silver <0.1710 49.02 40.59 83 75-125 mg/Kg
Thallium <0.9298 98.04 97.28 99 75-125 mg/Kg
Vanadium 62.33 98.04 161.3 101 75-125 mg/Kg
Zinc 46.96 98.04 143.6 99 75-125 mg/Kg
Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/06/24 Type: MSD Diln Fac: 1.000 Analyzed: 08/07/24
MSS Lab ID: 513455-001 Batch#: 347000 Prep: EPA 3050B
Lab ID: QC1175767 Sampled: 08/05/24 Analysis: EPA 6010B Matrix: Soil Received: 08/05/24 Analyst: DXC
QC1175767 Analyte Spiked Result %REC Limits Units RPD Lim Qual Antimony 98.04 22.95 23 * 75-125 mg/Kg 5 41
Arsenic 98.04 96.84 93 75-125 mg/Kg 0 35
Barium 98.04 284.4 111 75-125 mg/Kg 1 20
Beryllium 98.04 97.84 99 75-125 mg/Kg 0 20
Cadmium 98.04 93.83 95 75-125 mg/Kg 0 20
Chromium 98.04 130.6 96 75-125 mg/Kg 1 20
Cobalt 98.04 113.4 100 75-125 mg/Kg 0 20
Copper 98.04 113.5 101 75-125 mg/Kg 0 20
Lead 98.04 105.3 98 75-125 mg/Kg 0 20
Molybdenum 98.04 83.11 84 75-125 mg/Kg 1 20
Nickel 98.04 118.5 97 75-125 mg/Kg 1 20
Selenium 98.04 90.32 92 75-125 mg/Kg 1 20 b
Silver 49.02 39.90 81 75-125 mg/Kg 2 20
Thallium 98.04 97.24 99 75-125 mg/Kg 0 20
Vanadium 98.04 158.6 98 75-125 mg/Kg 2 20
Zinc 98.04 140.0 95 75-125 mg/Kg 2 20
Legend
*: Value is outside QC limits
RPD: Relative Percent
Difference
b: See narrative
1 of 1 v16
Metals Analytical Report: Batch QC
Lab #: 513507 Project#: 24201-01
Client: Baseline Environmental Location: East County Service Center 65 of 71
HA .P

ANALYTICAL

Field ID: ZZZZZZZZZZ Basis: as received Analyzed: 08/07/24 Type: Post Digest Spike Diln Fac: 1.000 Prep: EPA 3050B MSS Lab ID: 513455-001 Batch#: 347000 Analysis: EPA 6010B Lab ID: QC1175768 Sampled: 08/05/24 Analyst: DXC
Matrix: Soil Received: 08/05/24
QC1175768 Analyte MSS Result Spiked Result %REC Limits Units Qual Antimony <1.173 98.04 95.63 98 75-125 mg/Kg
Arsenic 5.470 98.04 103.6 100 75-125 mg/Kg
Barium 175.2 98.04 273.0 100 75-125 mg/Kg
Beryllium 0.4388 98.04 99.87 101 75-125 mg/Kg
Cadmium 0.3798 98.04 95.85 97 75-125 mg/Kg
Chromium 36.14 98.04 129.7 95 75-125 mg/Kg
Cobalt 15.30 98.04 115.0 102 75-125 mg/Kg
Copper 14.29 98.04 115.8 104 75-125 mg/Kg
Lead 9.453 98.04 108.2 101 75-125 mg/Kg
Molybdenum 0.6001 98.04 97.36 99 75-125 mg/Kg
Nickel 23.54 98.04 120.8 99 75-125 mg/Kg
Selenium <0.8806 98.04 98.26 100 75-125 mg/Kg b
Silver <0.1710 49.02 47.91 98 75-125 mg/Kg
Thallium <0.9298 98.04 99.00 101 75-125 mg/Kg
Vanadium 62.33 98.04 157.1 97 75-125 mg/Kg
Zinc 46.96 98.04 142.0 97 75-125 mg/Kg
Legend
b: See narrative
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Type: BLANK Batch#: 347106 Analysis: EPA 7471A
Lab ID: QC1176115 Prepared: 08/07/24 Analyst: MLL
Matrix: Soil Analyzed: 08/08/24
Diln Fac: 1.000 Prep: METHOD
QC1176115 Analyte Result RL Units
Mercury ND 0.14 mg/Kg
Legend
ND: Not Detected
RL: Reporting Limit
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Type: LCS Batch#: 347106 Analysis: EPA 7471A
Lab ID: QC1176116 Prepared: 08/07/24 Analyst: MLL
Matrix: Soil Analyzed: 08/08/24
Diln Fac: 1.000 Prep: METHOD
QC1176116 Analyte Spiked Result %REC Limits Units
Mercury 0.8333 0.8671 104 80-120 mg/Kg
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Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/07/24 Type: MS Diln Fac: 1.000 Analyzed: 08/08/24
MSS Lab ID: 513514-001 Batch#: 347106 Prep: METHOD
Lab ID: QC1176117 Sampled: 08/05/24 Analysis: EPA 7471A Matrix: Soil Received: 08/05/24 Analyst: MLL
QC1176117 Analyte MSS Result Spiked Result %REC Limits Units Mercury <0.05591 0.8621 0.9503 110 75-125 mg/Kg
Field ID: ZZZZZZZZZZ Basis: as received Prepared: 08/07/24 Type: MSD Diln Fac: 1.000 Analyzed: 08/08/24
MSS Lab ID: 513514-001 Batch#: 347106 Prep: METHOD
Lab ID: QC1176118 Sampled: 08/05/24 Analysis: EPA 7471A Matrix: Soil Received: 08/05/24 Analyst: MLL
QC1176118 Analyte Spiked Result %REC Limits Units RPD Lim Mercury 0.9091 0.9830 108 75-125 mg/Kg 2 20
Legend
RPD: Relative Percent
Difference
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Field ID: COMP-2 Batch#: 347821 Prep: METHOD
Type: SAMPLE Sampled: 08/05/24 Analysis: EPA 6010B
Lab ID: 513507-018 Received: 08/05/24 Analyst: SBW
Matrix: WET Leachate Prepared: 08/15/24
Diln Fac: 1.000 Analyzed: 08/15/24
513507-018 Analyte Result RL Units
Chromium ND 0.30 mg/L
Field ID: COMP-3 Batch#: 347821 Prep: METHOD
Type: SAMPLE Sampled: 08/05/24 Analysis: EPA 6010B
Lab ID: 513507-019 Received: 08/05/24 Analyst: SBW
Matrix: WET Leachate Prepared: 08/15/24
Diln Fac: 1.000 Analyzed: 08/15/24
513507-019 Analyte Result RL Units
Chromium ND 0.30 mg/L
Field ID: COMP-4 Batch#: 347821 Prep: METHOD
Type: SAMPLE Sampled: 08/05/24 Analysis: EPA 6010B
Lab ID: 513507-020 Received: 08/05/24 Analyst: SBW
Matrix: WET Leachate Prepared: 08/15/24
Diln Fac: 1.000 Analyzed: 08/15/24
513507-020 Analyte Result RL Units
Chromium ND 0.30 mg/L
Type: BLANK Batch#: 347821 Analysis: EPA 6010B
Lab ID: QC1178382 Prepared: 08/15/24 Analyst: SBW
Matrix: WET Leachate Analyzed: 08/15/24
Diln Fac: 1.000 Prep: METHOD
QC1178382 Analyte Result RL Units
Chromium ND 0.30 mg/L
Legend
ND: Not Detected
RL: Reporting Limit
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Chromium
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Type: BS Batch#: 347821 Analysis: EPA 6010B
Lab ID: QC1178383 Prepared: 08/15/24 Analyst: SBW
Matrix: WET Leachate Analyzed: 08/15/24
Diln Fac: 1.000 Prep: METHOD
QC1178383 Analyte Spiked Result %REC Limits Units
Chromium 4.000 3.858 96 80-120 mg/L
Type: BSD Batch#: 347821 Analysis: EPA 6010B
Lab ID: QC1178384 Prepared: 08/15/24 Analyst: SBW
Matrix: WET Leachate Analyzed: 08/15/24
Diln Fac: 1.000 Prep: METHOD
QC1178384 Analyte Spiked Result %REC Limits Units RPD Lim Chromium 4.000 3.825 96 80-120 mg/L 1 20
Legend
RPD: Relative Percent
Difference
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Chromium: Batch QC
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PHASE I ENVIRONMENTAL

SITE ASSESSMENT
15 JANUARY 2025

PROPOSED EAST COUNTY

SERVICE CENTER (SOUTHERN SITE)
Contra Costa County Project # WH429A
Brentwood, California
For:

Contra Costa County Public Works Department
Martinez, California
24201-01

BASELINE

ENVIRONMENTAL CONSULTING

388 17th Street, Suite 230, Oakland, CA 94612 | (510) 420-8686 | www.baseline-env.com Mailing Address: PO Box 18586, Oakland, CA 94619

PHASE I ENVIRONMENTAL SITE

ASSESSMENT
15 JANUARY 2025

PROPOSED EAST COUNTY SERVICE CENTER
(SOUTHERN SITE)
Brentwood, California
For:

Contra Costa County Public Works Department
Martinez, California
By:

Prepared By: Date:

Patrick Sutton
Principal Environmental Engineer
1/15/2025

BASELINE

ENVIRONMENTAL CONSULTING

iii
24201-01 Phase I ESA

TABLE OF CONTENTS

1. Introduction ............................................................................................................................ 1

2. Physical Setting ....................................................................................................................... 1

3. Historical Land Uses................................................................................................................ 2

4. Site Reconnaissance................................................................................................................ 3

5. Environmental Records........................................................................................................... 3

6. Previous Site Investigations..................................................................................................... 6

7. ASTM Phase I User Questionnaire........................................................................................... 6

8. Other Environmental Concerns............................................................................................... 7

9. ASTM E1527-21 Deviations and Data Gaps............................................................................. 7

10. Conclusions ............................................................................................................................. 8

11. Recommendations .................................................................................................................. 8

12. Limitations .............................................................................................................................. 8

13. Environmental Professional Statement................................................................................... 9

APPENDICES
A: Overview of ASTM E1527-21 Terminology
B: Historical Land Use Records
C: Southern Site Photographs
D: Environmental Records Report
E: Previous Investigation Report
F: ASTM Phase I User Questionnaire
G: Qualifications of Preparers

FIGURES
1: Southern Site Location
2: Northern Site Soil Investigation Location

1 24201-01 Phase I ESA

PHASE I ENVIRONMENTAL SITE ASSESSMENT
Proposed East County Service Center (Southern Site)
Brentwood, California

1. INTRODUCTION
This Phase I Environmental Site Assessment (ESA) was performed by Baseline Environmental Consulting (Baseline) on behalf of the Contra Costa County Public Works Department, in support of the evaluation to determine if the property on the south side of the proposed East County Service Center (Project) should be acquired. The adjacent southern property, identified as Assessor’s Parcel Number (APN) 016-120-024, is located approximately 145 feet southwest from the intersection of Brentwood Boulevard and Technology Way in Brentwood, California (Southern Site).

The purpose of this Phase I ESA was to identify environmental conditions that could adversely affect the chemical quality of soil or groundwater at the Southern Site, including Recognized Environmental Conditions (RECs), as defined by ASTM E1527-21, and other environmental concerns (e.g., agricultural pesticides). In accordance with ASTM E1527-21 and Baseline’s previous experience working on similar projects, these environmental conditions were evaluated based on review of the physical setting, historical land uses, environmental records, and previous environmental investigations, as well as a site reconnaissance. An overview of the key terminology related to ASTM E1527-21 that was used or considered during the preparation of this Phase I ESA is provided in Appendix A.

2. PHYSICAL SETTING
The approximately 5-acre Southern Site is located approximately 145 feet southwest from the intersection of Brentwood Boulevard and Technology Way in the City of Brentwood (City) (Figure 1). The Southern Site is a grassy undeveloped lot with no buildings present. Surrounding land uses include residential neighborhoods to the west; a grass field and commercial buildings to the north; commercial buildings to the east across Brentwood Boulevard; and a grass field to the south. Groundwater levels near the Southern Site have been reported as shallow as about 11 feet below ground surface.
1 Groundwater in the Southern Site vicinity is presumed to follow the general topography in a northeastern direction. The Southern Site is located within the Marsh Creek watershed.
1 Stratus Engineering Associates LLC, 2024. Groundwater Monitoring and Sampling Report, First Quarter 2024, Brentwood, California. May 1.

2 24201-01 Phase I ESA

3. HISTORICAL LAND USES
Historical land uses at the Southern Site and surrounding properties were evaluated to assess potential hazardous materials uses that have potentially affected soil or groundwater quality at the Southern Site. Historical land uses at and adjacent to the Southern Site were determined through review of readily available historical records including topographic maps, City directories, and aerial photographs. Sanborn Fire Insurance Maps, which are a common data source for reviewing historical land uses, were not available in the Southern Site vicinity. All the historical records reviewed for this Phase I ESA are included in Appendix B. Information from previous environmental assessments in the Southern Site vicinity was used to supplement the historical records.

3.1 Southern Site
Historical land uses for the Southern Site were primarily identified based on review of aerial photographs and topographic maps (Appendix B), as summarized in the table below.

Year Land Use Source
1914 An unnamed creek appears to have traversed the Southern Site. TM 1939 The unnamed creek is gone and replaced with farmland. AP 2006 The Southern Site appears to have become a vacant lot that is no longer used as farmland. AP Present No further changes to the Southern Site were noted. AP Notes: AP = aerial photograph; TM = topographic map
Based on the review of historical land use records, the Southern Site was primarily used for agricultural purposes from approximately 1939 to 2006. Environmental conditions of concern associated with the historical use of agricultural pesticides on the Southern Site are discussed further below under Section 8.

3.2 Surrounding Properties
Historical land uses for properties surrounding the Southern Site were primarily identified based on review of topographic maps and aerial photographs (Appendix B) as summarized in the table below.

Year Land Use Source
1939/1940
Farm fields were located on the south, east, and north side of the Southern Site. A roadway along the current alignment of Brentwood Boulevard was located on the east side of the Southern Site. Orchards were located to the east of the Southern Site across Brentwood Boulevard.

AP/TM
1963 The farm field south of the Southern Site was converted to an orchard AP 1979
Residential buildings were built to the southeast of the Southern Site. An apparent single-family home and barn structures were constructed to the southwest of the Southern Site next to the orchard.

AP
2020 Residential buildings built to the northeast of the Southern Site. AP Notes: AP = aerial photograph; TM = topographic map

3 24201-01 Phase I ESA
Based on review of historical land uses records, the adjacent properties surrounding the Southern Site were predominantly for agricultural purposes from approximately 1939 to the present. Environmental conditions of concern associated with the historical use of agricultural pesticides adjacent to the Southern Site are discussed further below under Section 8.

4. SITE RECONNAISSANCE
A reconnaissance of the Southern Site and adjacent properties was conducted to evaluate current land uses associated with hazardous materials that could have potentially resulted in a hazardous materials release or pose an obvious threat of a release in the future. Evidence of a hazardous materials releases could include, but is not limited to, observations of surface staining, stressed vegetation, and/or odors. The reconnaissance was conducted by a Baseline Environmental Scientist on 21 November 2024 by walking across the Southern Site. Adjacent properties were observed from the periphery of the Southern Site and by walking along other public rights-of-way. Photographs from the Southern Site reconnaissance are included in Appendix C.

The Southern Site consists of a vacant lot west of Brentwood Boulevard and south of Technology Way in Brentwood. The Southern Site appeared to have been recently trimmed of most of the tall vegetation except for some isolated spots of tall grass and bushes (Photo C1).

Trash appears to have migrated on the Southern Site from the adjacent fast-food establishment to the north, the roadside of Brentwood Boulevard to the east, and an apartment complex pool to the west (Photo C2 and C3). At the southwestern corner of the Southern Site an abandoned and half empty weed sprayer was found; the former contents of the sprayer were not labeled (Photo C4). A fresh layer of topsoil appeared to have been left on the west side of the Southern Site (Photo C5). On the northwest side of the Southern Site, cement blocks that are often used for fence foundations were observed (Photo C6).

Surrounding land uses included residential neighborhoods to the west; a grass field and commercial buildings to the north; commercial buildings to the east across Brentwood Boulevard; and a grass field to the south. Located southwest of the Southern Site is a farm with a variety of buildings of unknown use (Photo C7).

No storage of hazardous materials or evidence of a hazardous materials release were observed on or adjacent the Southern Site.

5. ENVIRONMENTAL RECORDS
Baseline retained EDR,2 a third-party vendor specializing in retrieval of environmental records, to conduct a search of environmental records from federal, state, and local databases pertaining to past and present hazardous materials use and/or releases at the Southern Site and at properties within up to one mile of the Southern Site based on the minimum search 2 Environmental Data Resources, 2024. The EDR Radius Map™ Report with Geocheck®, Technology Way and Brentwood Boulevard, Brentwood, CA 94513, Inquiry Number 7818767.4. November 12.

4 24201-01 Phase I ESA
distances specified in the ASTM Standard (Appendix D). In addition to the ASTM requirements, EDR identified properties within one-eighth mile of the Southern Site that are listed on their proprietary Historic Auto and Historic Cleaners databases, which include potential gas stations/auto repair facilities and dry cleaners EDR has identified based on historical business directories.

To evaluate sites of potential environmental concern that could adversely affect the chemical quality of soil or groundwater at the Southern Site, the following factors were considered:
distance from the Southern Site, inferred direction of groundwater flow, and type and magnitude of release. Therefore, for this assessment only records of hazardous materials use and/or releases on the Southern Site, adjacent to the Southern Site, or in the inferred upgradient direction from the Southern Site were evaluated.

5.1 Environmental Records of Hazardous Materials Storage The review of environmental records did not identify any sites that store hazardous materials on or adjacent to the Southern Site. This is consistent with observations during the Site reconnaissance.

5.2 Environmental Records of Hazardous Material Releases The review of environmental records identified seven hazardous materials release sites within one mile of the Southern Site. None of the hazardous materials releases were located on the Southern Site. Two of the release sites are located downgradient to the northeast of the Southern Site and are closed, which indicates that investigation and remediation activities have been completed; therefore, these sites are not expected to affect environmental conditions on the Southern Site.

One of the release sites, Savers SS, was not mapped in the correct location. The location of the site is more than a mile north of the Southern Site and thus is not expected to affect environmental conditions beneath the Southern Site.

The other four release sites are located either cross- or up-gradient to the east, south, and southeast of the Southern Site and are discussed below.

5.2.1 Lyon Woodfield Project
In 1965, elevated concentrations of organochlorine pesticides (OCPs) of DDT and toxaphene from former agricultural use at the Lyon Woodfield Project site (Site 1 on Figure 1) were reported in soil samples collected approximately 450 feet east of the Southern Site. It was determined that the toxaphene was the only constituent of concern during a Health Risk Assessment conducted in 2000. The site was capped with a two-foot cover of clean soil and the contaminated soil was not removed. The toxaphene was determined to be immobile in the soil and as a result does not pose a significant risk to groundwater. The status of the site was deemed to require no further action by Central Valley Regional Water Quality Control Board

5 24201-01 Phase I ESA
and residential housing was built upon the site. As a result, the residual pesticide contamination is not expected to affect the environmental conditions at the Southern Site.

5.2.2 Beacon #3544 (Former)
In 1996, a release of petroleum from leaking underground storage tanks (USTs) was reported at the Beacon #3544 site (Site 2 on Figure 1), which is located approximately 950 feet to the southeast of the Southern Site. The tanks were removed and approximately 800 cubic yards of contaminated soil were removed and disposed off-site. From 2006 to 2008, oxygen was injected into three sparge wells to enhance in-situ biodegradation. In 2011, the case was closed by the lead regulatory oversight agency, the Central Valley Regional Water Quality Control Board.

Based on the last groundwater monitoring event, residual concentrations of methyl tert-butyl ether (MTBE) remained in groundwater but were attributed to a groundwater plume from the First Stop Gas site to the southwest (see section 5.2.3). The plume appears to be migrating to the northeast away from the Southern Site. Therefore, residual groundwater contamination is not expected to affect environmental conditions at the Southern Site.

5.2.3 First Stop Gas
In 2003, a release of petroleum was reported at the First Stop Gas site (Site 3 on Figure 1) underneath the dispenser islands during the upgrading of three USTs approximately 1,000 feet south of the Southern Site. Subsequent investigations found elevated levels of total petroleum hydrocarbons as gasoline (TPH-g) and diesel (TPH-d), benzene, and MTBE. The USTs were removed in 2014 and signs of soil contamination during removal were recorded. Remedial actions on the site included the removal of 179 tons of contaminated soil in 2010, 64,000 gallons of contaminated groundwater extraction in 2010, in-situ chemical oxidation for hydrocarbon degradation in 2012, and the installation of absorbent socks in wells to capture liquid-phase hydrocarbons in 2023. The plume of contaminants appears to be migrating to the northeast away from the Southern Site. Therefore, residual groundwater contamination is not expected to affect environmental conditions beneath the Southern Site.

5.2.4 Brentwood Sub Station
In 1986, a release of petroleum was discovered during the removal of a 550-gallon gasoline UST at the Brentwood Sub Station site (Site 4 on Figure 1) approximately 2,200 feet southeast from the Southern Site. Quarterly groundwater monitoring events were conducted between 1992 to 1996 on and adjacent to the site. Based on the monitoring events, it was found that groundwater contamination was limited to the area immediately around the former tank pit. As a result, the Central Valley Regional Water Quality Control closed the site in 1997. Therefore, the residual groundwater contamination is not expected to affect environmental conditions beneath the Southern Site due to the localized contamination and the distance to the Southern Site.

6 24201-01 Phase I ESA

6. PREVIOUS SITE INVESTIGATIONS

6.1 Northern Site Soil Investigation
In October 2024, Baseline prepared a Soil Investigation Report3 for the Project at the adjacent parcels to the north of the Southern Site (APNs 016‐410‐008, 016‐410‐009, 016‐410‐010, 016‐ 410‐011, 016‐410‐012, and 016‐410‐013), collectively referred to as the “Northern Site”. The purpose of the investigation was to evaluate if agricultural pesticides, such as arsenic and OCPs, were present in shallow soil at the Northern Site. Baseline also evaluated soil for other contaminants that are typically required to be tested by landfills for acceptance of soil disposal, including Title 22 metals, petroleum hydrocarbons, and volatile organic compounds (VOCs).

Eight borings (B-1 through B-8) were advanced to depths of approximately 2 to 2.5 feet below ground surface at the Northern Site at the locations shown on Figure 2.

The soil investigation found that elevated levels of OCPs were present on the Northern Site. The report determined that soil excavated from the western, north-central, and northeastern portions of the Northern Site (areas outside of the yellow-dashed boundary shown on Figure 2) should be classified as non-hazardous waste for off-site disposal purposes. Soil excavated from these areas could also be re-used on the Northern Site if the soil meets geotechnical requirements. In the south-central and southeastern portions of the Northern Site, soil excavated from the ground surface to a depth of 1.5 feet below ground surface should be classified as California-hazardous waste (or non-RCRA hazardous waste4) for off-site disposal purposes based on the analytical results for OCPs (4,4'-DDE, 4,4'-DDD, and 4,4'-DDT) exceeding California hazardous waste criteria.

A copy of the Project Soil Investigation Report is included in Appendix E. Based on proximity and shared history of the Southern Site and adjacent parcels being used for agricultural purposes, similar levels of OCP contamination may be present on the Southern Site.

7. ASTM PHASE I USER QUESTIONNAIRE
An ASTM Phase I User Questionnaire for the Southern Site was completed by the Contra Costa County Public Works Department (Appendix F). Based on the results, the County is not aware of any cleanup liens, land-use limitations, or chemical releases on the Southern Site. The County is aware that the Project Soil Investigation on the adjacent parcels to the north of the Southern Site identified OCP contamination which may extend onto the Southern Site. 3 Baseline Environmental Consulting, 2024. Soil Investigation Report, Proposed East County Service Center, Contra Costa County Project # WH429A, Brentwood, California. 3 October. 4 Non-RCRA hazardous waste refers to hazardous waste as defined under California law (CCR Title 22) which is not defined as hazardous waste under the Federal Resource Conservation and Recovery Act (RCRA).

7 24201-01 Phase I ESA

8. OTHER ENVIRONMENTAL CONCERNS

8.1 Agricultural Pesticides
Prior to 1950, inorganic pesticides that contained elevated concentrations of metals, such as arsenic, were commonly used in California agriculture. After 1950, OCPs were commonly used in California agriculture until about the mid-1970s. Arsenic from inorganic pesticides and residues from OCPs used in the past have the potential to persist for many decades in shallow soils and can affect human health and the environment.5 Based on a review of historical land use records (see Section 3), the Southern Site and adjacent properties were used for agriculture as early as 1939. The Project Soil Investigation Report determined that pesticide contamination is present on the adjacent parcels to the north of the Southern Site. Therefore, shallow soils on the Southern Site may be contaminated with arsenic and/or OCPs.

9. ASTM E1527-21 DEVIATIONS AND DATA GAPS
ASTM E1527-21 requires the identification of deviations and data gaps, along with actions taken to address these gaps, and an opinion as to whether these deviations and data gaps are significant. A data gap may result from a lack of or inability to obtain information during any of the activities required by ASTM E1527-21. Particularly, review of reasonably ascertainable historical land use information from the first developed land use to the present that does not provide sufficient detail to assess potential land use changes at 5-year intervals or less may be considered a data gap. Data gaps identified during the preparation of this Phase I ESA are described, below.

9.1 Historical Land Use Records Review
The time intervals between some of the historical land uses records exceeded 5 years in some cases. These data gaps are not considered significant because the land uses were relatively consistent between the extended time intervals.

9.2 Interviews with Government Regulatory Officials
ASTM E1527-21 requires interviews with state or local government regulatory agency officials regarding the potential for contamination on a site. These interviews were not conducted because any information obtained would likely duplicate information already reviewed from other standard sources, including the EDR report, Project Soil Investigation Report, the ASTM Phase I User Questionnaire, and online regulatory agency records. 5 Department of Toxic Substances Control, 2008. Interim Guidance for Sampling Agricultural Properties (Third Revision). https://dtsc.ca.gov/wp-content/uploads/sites/31/2018/09/Ag-Guidance-Rev-3-August-7-2008-2.pdf.

August 7.

8 24201-01 Phase I ESA

10. CONCLUSIONS
We have performed this Phase I ESA in conformance with the scope and limitations of ASTM E1527-21 for the Southern Site. Any exceptions to, or deletions from, this practice are described in Section 9 of this report. Although this assessment has revealed no RECs in connection with the Southern Site, it has revealed the following environmental concern that is not considered an REC:
• Potential pesticide contamination (arsenic and OCPs) from historical use of the land for agriculture.

11. RECOMMENDATIONS
Based on the conclusions discussed above, Baseline recommends conducting a Phase II ESA to collect and evaluate shallow soils samples for potential pesticide contamination (arsenic and OCPs) at the Southern Site. All environmental investigations for the Southern Site should be provided to the Project contractors to incorporate into their Health and Safety and Hazard Communication programs.

12. LIMITATIONS
This Phase I ESA was performed to provide an understanding of the current environmental conditions at the Southern Site. Baseline’s interpretations and conclusions regarding this information, presented in this report, are based on the expertise and experience of Baseline in conducting similar assessments and current local, state, and federal regulations and standards.

Baseline’s objective is to perform our work with care, exercising the customary thoroughness and competence of earth science, environmental, and engineering consulting professionals, in accordance with the standard for professional services for a consulting firm at the time these services were provided. It is important to recognize that even the most comprehensive scope of services may fail to detect environmental conditions and potential liability at a particular site.

Therefore, Baseline cannot act as insurers and cannot “certify or underwrite” that a site is free of environmental contamination, and no expressed or implied representation or warranty is included or intended in this report except that the work was performed within the limits prescribed with the customary thoroughness and competence of our profession.

The passage of time, manifestation of latent conditions, or occurrence of future events may require further exploration at the project site, analysis of the data, and re-evaluation of the findings, observations, conclusions, and recommendations expressed in this report.

The findings, observations, conclusions, and recommendations expressed by Baseline in this report are limited by the scope of services and should not be considered an opinion concerning the compliance of any past or current owner or operator of the project site with any federal, state, or local law or regulation. No warranty or guarantee, whether expressed or implied, is

9 24201‐01 Phase I ESA
made with respect to the data reported or findings, observations, conclusions, and recommendations expressed in this report.

13. ENVIRONMENTAL PROFESSIONAL STATEMENT
I declare that, to the best of my professional knowledge and belief, I meet the definition of Environmental Professional as defined in 40 CFR Part 312 and I have the specific qualifications based on education, training, and experience to assess a property of the nature, history, and setting of the Southern Site. I have developed and performed all appropriate inquiries in conformance with the standards and practices set forth in 40 CFR Part 312. Qualifications of the preparers of this document are included in Appendix G.

FIGURES

24201-01 Figures 12/17/24
Figure 1
Southern Site Location
Proposed East County Service Center (Southern Site)
Site 1
Site 3
Site 2
Site 4 Brentwood Boulevard
Technology Way
N
0 600 Feet
Legend
Site Location
Site Boundary
Hazardous Materials Release Sites
D *
•

BASELINE

ENVIRONMENTAL CONSULTING
A

24201-01 Figures 12/17/24
Figure 2
Northern Site Soil Investigation Location
Proposed East County Service Center (Southern Site)
B-4
B-3
B-2
B-1 B-5
B-6
B-7
B-8
N
0 250 Feet
Legend
Site Boundary
Northern Site Soil Investigation Boundary
California Hazardous Waste
Northern Site Soil Investigation Boring
D
D
r- ,
L .J
•

BASELINE

ENVIRONMENTAL CONSULTING
A

APPENDIX A
OVERVIEW OF ASTM E1527-21 TERMINOLOGY

1 Overview of ASTM E1527-21 Terminology
This is a general overview of the key terminology related to ASTM E1527-21 that was used or considered during the prepara�on of the Phase I Environmental Site Assessment. A complete and detailed descrip�on of all terms is provided in Sec�on 3 of ASTM E1527-21.

Recognized Environmental Condi�on (REC)
The presence of hazardous substances or petroleum products in, on, or at the subject property due to a release to the environment; (2) the likely presence of hazardous substances or petroleum products in, on, or at the subject property due to a release or likely release to the environment; or (3) the presence of hazardous substances or petroleum products in, on, or at the subject property under condi�ons that pose a material threat of a future release to the environment.

According to ASTM E1527-21, an REC does not include de minimis condi�ons that generally do not present a threat to human health or the environment and that generally would not be the subject of an enforcement ac�on if brought to the aten�on of appropriate governmental agencies.

Controlled Recognized Environmental Condi�on (CREC)
An REC affec�ng the subject property that has been addressed to the sa�sfac�on of the applicable regulatory authority or authori�es with hazardous substances or petroleum products allowed to remain in place subject to implementa�on of required controls (e.g., engineering controls, land use restric�ons, or other property use limita�ons).

Historical Recognized Environmental Condi�on (HREC)
A previous release of hazardous substances or petroleum products affec�ng the subject property that has been addressed to the sa�sfac�on of the applicable regulatory authority or authori�es and mee�ng unrestricted use criteria established by the applicable regulatory authority or authori�es without subjec�ng the subject property to any controls (e.g., engineering controls, land use restric�ons, or other property use limita�ons). An HREC is not an REC.

A past release that qualified as a HREC may no longer qualify as a HREC if new condi�ons or informa�on have been iden�fied such as, among other things, a change in regulatory criteria or a subsequently iden�fied migra�on pathway that was not previously known or evaluated.

APPENDIX B

HISTORICAL LAND USE RECORDS

The EDR Aerial Photo Decade Package
APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Inquiry Number: November 12, 20247818767.8 6 Armstrong Road, 4th floor
Shelton, CT 06484
Toll Free: 800.352.0050
www.edrnet.com

2020 1"=500' Flight Year: 2020 USDA/NAIP
2016 1"=500' Flight Year: 2016 USDA/NAIP
2012 1"=500' Flight Year: 2012 USDA/NAIP
2009 1"=500' Flight Year: 2009 USDA/NAIP
2006 1"=500' Flight Year: 2006 USDA/NAIP
1998 1"=500' Flight Date: August 22, 1998 USDA
1993 1"=500' Acquisition Date: January 01, 1993 USGS/DOQQ 1984 1"=500' Flight Date: June 29, 1984 USDA
1982 1"=500' Flight Date: July 05, 1982 USDA
1979 1"=500' Flight Date: August 16, 1979 USDA
1966 1"=500' Flight Date: May 16, 1966 USDA
1963 1"=500' Flight Date: July 15, 1963 EDR Proprietary Aerial Viewpoint 1958 1"=500' Flight Date: August 09, 1958 USDA
1949 1"=500' Flight Date: October 13, 1949 USGS
1939 1"=500' Flight Date: June 28, 1939 USDA
EDR Aerial Photo Decade Package 11/12/24 APN 016-120-024 Site Name: Client Name: Baseline Environmental Cons. Technology Way and Brentwood Boulevard388 17th Street, Suite 230 Brentwood, CA 94513 Oakland, CA 94612 EDR Inquiry # 7818767.8 Contact: Johnathan Rizzo-Mosbaugh Environmental Data Resources, Inc. (EDR) Aerial Photo Decade Package is a screening tool designed to assist environmental professionals in evaluating potential liability on a target property resulting from past activities. EDR’s professional researchers provide digitally reproduced historical aerial photographs, and when available, provide one photo per decade. Search Results: Year Scale Details Source
When delivered electronically by EDR, the aerial photo images included with this report are for ONE TIME USE ONLY. Further reproduction of these aerial photo images is prohibited without permission from EDR. For more information contact your EDR Account Executive. Disclaimer - Copyright and Trademark Notice Copyright 2024 by Environmental Data Resources, Inc. All rights reserved. Reproduction in any media or format, in whole or in part, of any report or map of Environmental Data Resources, Inc., or its affiliates, is prohibited without prior written permission.

EDR and its logos (including Sanborn and Sanborn Map) are trademarks of Environmental Data Resources, LLC or its affiliates. All other trademarks used herein are the property of their respective owners. 7818767 - 8 page 2 This Report contains certain information obtained from a variety of public and other sources reasonably available to Environmental Data Resources, LLC. It cannot be concluded from this Report that coverage information for the target and surrounding properties does not exist from other sources. This Report is provided on an “AS IS”, “AS AVAILABLE” basis. NO WARRANTY EXPRESS OR IMPLIED IS MADE WHATSOEVER IN CONNECTION WITH THIS REPORT.

ENVIRONMENTAL DATA RESOURCES, LLC AND ITS SUBSIDIARIES, AFFILIATES AND THIRD PARTY SUPPLIERS DISCLAIM ALL WARRANTIES, OF ANY

KIND OR NATURE, EXPRESS OR IMPLIED, ARISING OUT OF OR RELATED TO THIS REPORT OR ANY OF THE DATA AND INFORMATION PROVIDED IN

THIS REPORT, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES REGARDING ACCURACY, QUALITY, CORRECTNESS, COMPLETENESS,

COMPREHENSIVENESS, SUITABILITY, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, NON-INFRINGEMENT, MISAPPROPRIATION, OR OTHERWISE. ALL RISK IS ASSUMED BY THE USER. IN NO EVENT SHALL ENVIRONMENTAL DATA RESOURCES, LLC OR ITS

SUBSIDIARIES, AFFILIATES OR THIRD PARTY SUPPLIERS BE LIABLE TO ANYONE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL,

CONSEQUENTIAL OR OTHER DAMAGES OF ANY TYPE OR KIND (INCLUDING BUT NOT LIMITED TO LOSS OF PROFITS, LOSS OF USE, OR LOSS OF DATA), ARISING OUT OF OR IN ANY WAY CONNECTED WITH THIS REPORT OR ANY OF THE DATA AND INFORMATION PROVIDED IN THIS REPORT.

Any analyses, estimates, ratings, environmental risk levels, or risk codes provided in this Report are provided for illustrative purposes only, and are not intended to provide, nor should they be interpreted as providing any facts regarding, or prediction or forecast of, any environmental risk for any property. Only an assessment performed by a qualified environmental professional can provide findings, opinions or conclusions regarding the environmental risk or conditions in, on or at any property.
~EDR'

7818767.8 2020 = 500'
YEAR: _____ _

7818767.8 2016 = 500'
....... , ....... ..
•
YEAR: --------

7818767.8 2012 = 500'
•
INQUIRY#: ____ _
YEAR: _____ _

7818767.8 2009 = 500'
•
INQUIRY#: ____ _
YEAR: -----------

7818767.8 2006 = 500'

7818767.8 1998 = 500'
'
YEAR: _____ _

7818767.8 1993 = 500'
YEAR: _____ _

7818767.8 1984 = 500'

7818767.8 1982 = 500'

7818767.8 1979 = 500'
YEAR: --------

7818767.8 1966 = 500'

7818767.8 1963 = 500'
YEAR: --------
. . .. . .. . . . ........ ...... . :: :::·:·.::·:::::: ·:. . . . . . . . . .. .. . . . . : : : :; : : ~= . : :.: : ! .... .. ..... ...... . . .... . . . .. . . . . .. . .......... , . . . . . . . . . . . . . . . . .. . . .. . . . .. . . . . . . ................. . . . . . . . ...... . .. . . . ...... .. . . . . ·• .. . .. .. . . .. . . . . ~~·:.;·::::. . .. .. . . ·• : .... •:;•:! ...... . . .. ............ . .. . . . . . . ·• .... . .. . . . . . . . . . ... . . . . .. ... . . .. . . . ...... ....... .... . . . .... ..... ······ .... .. ... : ·:: ! : : • : : . : : : .. : . : : . : : . :: .. ·::::;.: .. ;.;::;;::.::::: ··••·· . -............... ········· ... . . .... . . . . . .. . .. . .. . .. . . ................ ·••••• ........... ••••••.... ••• . . .. . . .. . . . . . "' ................. ...... ........ . . . . . . . .. . ~ ..... . ................ ....... ······· . . . . .. .... •••• ··:.c···
-~==·-~· • ••• •~"'•······
--~ . .... .. ·.•=· .•.•tf!.•.• . ··••if••·· .;::.:..:.: ... ·············· . ...................................... .................... . 41; ...................................... ........ . ····. ··.................................. ········· ...................... .. . ....................................... . ................ .............................. . . ..................................... ········· .. ···· .... · ............................... -.............. . .. ................................... -.......... .. ... . ........................................... . .......................................... . ................................................. ................................................ ._ . ............................................. ........................................... .................................... .......... -........................ ...................... - .......................... .............

7818767.8 1958 = 500'
YEAR: --------

7818767.8 1949 = 500'
INQUIRY#:
------
YEAR: _____ _

7818767.8 1939 = 500'
INQUIRY#:
--------
YEAR: _____ _ ir N
~EDR.
:; i.,::~· ............ t~t~t."
•

EDR Historical Topo Map Report
Inquiry Number:
6 Armstrong Road, 4th floor
Shelton, CT 06484
Toll Free: 800.352.0050
www.edrnet.com
with QuadMatch™
APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 November 12, 20247818767.4

EDR Historical Topo Map Report
EDR Inquiry #
Search Results:

P.O.#
Project:

Maps Provided:

Disclaimer - Copyright and Trademark Notice
EDR and its logos (including Sanborn and Sanborn Map) are trademarks of Environmental Data Resources, LLC or its affiliates. All other trademarks used herein are the property of their respective owners.
- page
Coordinates:

Latitude:

Longitude:

UTM Zone:

UTM X Meters:

UTM Y Meters:

Elevation:

Contact:

Site Name: Client Name:
2021
2018
2015
2012
1978
1968
1954
1943
1940
1916
1914
11/12/24 APN 016-120-024 Baseline Environmental Cons. Technology Way and Brentwood Boulevard388 17th Street, Suite 230 Brentwood, CA 94513 Oakland, CA 94612 7818767.4 Johnathan Rizzo-Mosbaugh EDR Topographic Map Library has been searched by EDR and maps covering the target property location as provided by Baseline Environmental Cons. were identified for the years listed below. EDR’s Historical Topo Map Report is designed to assist professionals in evaluating potential liability on a target property resulting from past activities. EDRs Historical Topo Map Report includes a search of a collection of public and private color historical topographic maps, dating back to the late 1800s.
24201-01 37.944044 37° 56' 39" North ICF East Co. Service Center -121.69792 -121° 41' 53" West Zone 10 North 614408.38 4200406.05 68.00' above sea level This Report contains certain information obtained from a variety of public and other sources reasonably available to Environmental Data Resources, LLC. It cannot be concluded from this Report that coverage information for the target and surrounding properties does not exist from other sources. This Report is provided on an “AS IS”, “AS AVAILABLE” basis. NO WARRANTY EXPRESS OR IMPLIED IS MADE WHATSOEVER IN CONNECTION WITH THIS REPORT.

ENVIRONMENTAL DATA RESOURCES, LLC AND ITS SUBSIDIARIES, AFFILIATES AND THIRD PARTY SUPPLIERS DISCLAIM ALL WARRANTIES, OF ANY

KIND OR NATURE, EXPRESS OR IMPLIED, ARISING OUT OF OR RELATED TO THIS REPORT OR ANY OF THE DATA AND INFORMATION PROVIDED IN

THIS REPORT, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES REGARDING ACCURACY, QUALITY, CORRECTNESS, COMPLETENESS,

COMPREHENSIVENESS, SUITABILITY, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, NON-INFRINGEMENT, MISAPPROPRIATION, OR OTHERWISE. ALL RISK IS ASSUMED BY THE USER. IN NO EVENT SHALL ENVIRONMENTAL DATA RESOURCES, LLC OR ITS

SUBSIDIARIES, AFFILIATES OR THIRD PARTY SUPPLIERS BE LIABLE TO ANYONE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL,

CONSEQUENTIAL OR OTHER DAMAGES OF ANY TYPE OR KIND (INCLUDING BUT NOT LIMITED TO LOSS OF PROFITS, LOSS OF USE, OR LOSS OF DATA), ARISING OUT OF OR IN ANY WAY CONNECTED WITH THIS REPORT OR ANY OF THE DATA AND INFORMATION PROVIDED IN THIS REPORT.

Any analyses, estimates, ratings, environmental risk levels, or risk codes provided in this Report are provided for illustrative purposes only, and are not intended to provide, nor should they be interpreted as providing any facts regarding, or prediction or forecast of, any environmental risk for any property. Only an assessment performed by a qualified environmental professional can provide findings, opinions or conclusions regarding the environmental risk or conditions in, on or at any property.

Copyright 2024 by Environmental Data Resources, Inc. All rights reserved. Reproduction in any media or format, in whole or in part, of any report or map of Environmental Data Resources, Inc., or its affiliates, is prohibited without prior written permission. 7818767 4 2 ~EDR•

page
Topo Sheet Key
This EDR Topo Map Report is based upon the following USGS topographic map sheets. -
2021 Source Sheets
2021
Brentwood

7.5-minute, 24000
2018 Source Sheets
2018
Brentwood

7.5-minute, 24000
2015 Source Sheets
2015
Brentwood

7.5-minute, 24000
2012 Source Sheets
2012
Brentwood

7.5-minute, 24000
7818767 4 3

page
Topo Sheet Key
This EDR Topo Map Report is based upon the following USGS topographic map sheets. -
1978 Source Sheets
1978
Brentwood

7.5-minute, 24000
Aerial Photo Revised 1974
1968 Source Sheets
1968
Brentwood

7.5-minute, 24000
Aerial Photo Revised 1968
1954 Source Sheets
1954
Brentwood

7.5-minute, 24000
Aerial Photo Revised 1949
1943 Source Sheets
1943
BYRON
15-minute, 62500
7818767 4 4

page
Topo Sheet Key
This EDR Topo Map Report is based upon the following USGS topographic map sheets. -
1940 Source Sheets
1940
Byron
15-minute, 62500
Aerial Photo Revised 1940
1916 Source Sheets
1916
Byron
15-minute, 62500
1914 Source Sheets
1914
Brentwood

7.5-minute, 31680
7818767 4 5

Historical Topo Map
page
SITE NAME:

ADDRESS:

CLIENT:

This report includes information from the
following map sheet(s).
-
W E

SW S SE

NW N NE
2021 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, Brentwood, 2021, 7.5-minute
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page
SITE NAME:

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This report includes information from the
following map sheet(s).
-
W E

SW S SE

NW N NE
2018 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, Brentwood, 2018, 7.5-minute
7818767 4 7
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BALFOUR RD

Historical Topo Map
page
SITE NAME:

ADDRESS:

CLIENT:

This report includes information from the
following map sheet(s).
-
W E

SW S SE

NW N NE
2015 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, Brentwood, 2015, 7.5-minute
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page
SITE NAME:

ADDRESS:

CLIENT:

This report includes information from the
following map sheet(s).
-
W E

SW S SE

NW N NE
2012 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, Brentwood, 2012, 7.5-minute
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page
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CLIENT:

This report includes information from the
following map sheet(s).
-
W E

SW S SE

NW N NE
1978 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, Brentwood, 1978, 7.5-minute
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page
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following map sheet(s).
-
W E

SW S SE

NW N NE
1968 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, Brentwood, 1968, 7.5-minute
7818767 4 11
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page
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following map sheet(s).
-
W E

SW S SE

NW N NE
1954 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, Brentwood, 1954, 7.5-minute
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page
SITE NAME:

ADDRESS:

CLIENT:

This report includes information from the
following map sheet(s).
-
W E

SW S SE

NW N NE
1943 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, BYRON, 1943, 15-minute
7818767 4 13
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-
W E

SW S SE

NW N NE
1940 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

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7818767 4 14
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page
SITE NAME:

ADDRESS:

CLIENT:

This report includes information from the
following map sheet(s).
-
W E

SW S SE

NW N NE
1916 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, Byron, 1916, 15-minute
7818767 4 15
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Historical Topo Map
page
SITE NAME:

ADDRESS:

CLIENT:

This report includes information from the
following map sheet(s).
-
W E

SW S SE

NW N NE
1914 0 Miles 0.25 0.5 1 1.5 APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 Baseline Environmental Cons.

TP, Brentwood, 1914, 7.5-minute
7818767 4 16
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59

Certified Sanborn® Map Report
Inquiry Number:
6 Armstrong Road, 4th floor
Shelton, CT 06484
Toll Free: 800.352.0050
www.edrnet.com
APN 016-120-024 Technology Way and Brentwood Boulevard Brentwood, CA 94513 November 12, 20247818767.3

Certified Sanborn® Map Report
Certified Sanborn Results:

Disclaimer - Copyright and Trademark Notice
EDR and its logos (including Sanborn and Sanborn Map) are trademarks of Environmental Data Resources, LLC or its affiliates. All other trademarks used herein are the property of their respective owners.
- page
The Sanborn Library includes more than 1.2 million
fire insurance maps from Sanborn, Bromley, Perris &
Browne, Hopkins, Barlow and others which track
historical property usage in approximately 12,000
American cities and towns. Collections searched:

Library of Congress
University Publications of America
EDR Private Collection
The Sanborn Library LLC Since 1866™
Limited Permission To Make Copies
Sanborn® Library search results
EDR Inquiry # Contact:

Site Name: Client Name:

Certification #
PO #
Project
11/12/24 Technology Way and Brentwood Boulevard APN 016-120-024 Baseline Environmental Cons. 388 17th Street, Suite 230 Brentwood, CA 94513 7818767.3 Oakland, CA 94612 Johnathan Rizzo-Mosbaugh The Sanborn Library has been searched by EDR and maps covering the target property location as provided by Baseline Environmental Cons. were identified for the years listed below. The Sanborn Library is the largest, most complete collection of fire insurance maps. The collection includes maps from Sanborn, Bromley, Perris & Browne, Hopkins, Barlow, and others. Only Environmental Data Resources Inc. (EDR) is authorized to grant rights for commercial reproduction of maps by the Sanborn Library LLC, the copyright holder for the collection.

Results can be authenticated by visiting www.edrnet.com/sanborn.

The Sanborn Library is continually enhanced with newly identified map archives. This report accesses all maps in the collection as of the day this report was generated. 6A31-40CE-8FF5 24201-01 UNMAPPED PROPERTY ICF East Co. Service Center This report certifies that the complete holdings of the Sanborn Library, LLC collection have been searched based on client supplied target property information, and fire insurance maps covering the target property were not found.

Certification #: 6A31-40CE-8FF5
Baseline Environmental Cons. (the client) is permitted to make up to FIVE photocopies of this Sanborn Map transmittal and each fire insurance map accompanying this report solely for the limited use of its customer. No one other than the client is authorized to make copies. Upon request made directly to an EDR Account Executive, the client may be permitted to make a limited number of additional photocopies. This permission is conditioned upon compliance by the client, its customer and their agents with EDR's copyright policy; a copy of which is available upon request.

This Report contains certain information obtained from a variety of public and other sources reasonably available to Environmental Data Resources, LLC. It cannot be concluded from this Report that coverage information for the target and surrounding properties does not exist from other sources. This Report is provided on an “AS IS”, “AS AVAILABLE” basis. NO WARRANTY EXPRESS OR IMPLIED IS MADE WHATSOEVER IN CONNECTION WITH THIS REPORT.

ENVIRONMENTAL DATA RESOURCES, LLC AND ITS SUBSIDIARIES, AFFILIATES AND THIRD PARTY SUPPLIERS DISCLAIM ALL WARRANTIES, OF ANY

KIND OR NATURE, EXPRESS OR IMPLIED, ARISING OUT OF OR RELATED TO THIS REPORT OR ANY OF THE DATA AND INFORMATION PROVIDED IN

THIS REPORT, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES REGARDING ACCURACY, QUALITY, CORRECTNESS, COMPLETENESS,

COMPREHENSIVENESS, SUITABILITY, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, NON-INFRINGEMENT, MISAPPROPRIATION, OR OTHERWISE. ALL RISK IS ASSUMED BY THE USER. IN NO EVENT SHALL ENVIRONMENTAL DATA RESOURCES, LLC OR ITS

SUBSIDIARIES, AFFILIATES OR THIRD PARTY SUPPLIERS BE LIABLE TO ANYONE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL,

CONSEQUENTIAL OR OTHER DAMAGES OF ANY TYPE OR KIND (INCLUDING BUT NOT LIMITED TO LOSS OF PROFITS, LOSS OF USE, OR LOSS OF DATA), ARISING OUT OF OR IN ANY WAY CONNECTED WITH THIS REPORT OR ANY OF THE DATA AND INFORMATION PROVIDED IN THIS REPORT.

Any analyses, estimates, ratings, environmental risk levels, or risk codes provided in this Report are provided for illustrative purposes only, and are not intended to provide, nor should they be interpreted as providing any facts regarding, or prediction or forecast of, any environmental risk for any property. Only an assessment performed by a qualified environmental professional can provide findings, opinions or conclusions regarding the environmental risk or conditions in, on or at any property.

Copyright 2024 by Environmental Data Resources, Inc. All rights reserved. Reproduction in any media or format, in whole or in part, of any report or map of Environmental Data Resources, Inc., or its affiliates, is prohibited without prior written permission. 7818767 3 2 ✓
✓
✓
~EDR"

APPENDIX C

SITE PHOTOGRAPHS

APPENDIX C: PHOTOGRAPHS FROM SITE RECONAISSANCE
Photo C1
View of the Site as seen from the eastern border of the Southern Site.

APPENDIX C: PHOTOGRAPHS FROM SITE RECONAISSANCE
Photo C2
View of the scattered pile of fast-food related trash on the northeastern corner of the Southern Site.

APPENDIX C: PHOTOGRAPHS FROM SITE RECONAISSANCE
Photo C3
View of a scattered trash on the Southern Site most likely from littering along Brentwood Boulevard.

APPENDIX C: PHOTOGRAPHS FROM SITE RECONAISSANCE
Photo C4
Abandoned weed sprayer container found on the eastern border of the Southern Site. The container was not labeled.

APPENDIX C: PHOTOGRAPHS FROM SITE RECONAISSANCE
Photo C5
Small fresh layer of topsoil found near the western border of the Southern Site.

APPENDIX C: PHOTOGRAPHS FROM SITE RECONAISSANCE
Photo C6
Cement blocks used for fence foundations seen nearby the western border of the Southern Site.

APPENDIX C: PHOTOGRAPHS FROM SITE RECONAISSANCE
Photo C7
View of a farm and farm buildings as seen from the southwest of the Southern Site.

APPENDIX D

ENVIRONMENTAL RECORDS REPORT

FORM-LBC-TFS
®kcehCoeG htiw tropeR ™paM suidaR RDE ehT
6 Armstrong Road, 4th floor
Shelton, CT 06484
Toll Free: 800.352.0050
www.edrnet.com
APN 016-120-024
Technology Way and Brentwood Boulevard
Brentwood, CA 94513
Inquiry Number: 7818767.2s
November 12, 2024
~EDR"

TABLE OF CONTENTS

SECTION PAGE
Executive Summary ES1
Overview Map 2
Detail Map 3
Map Findings Summary 4
Map Findings 9
Orphan Summary 456
Government Records Searched/Data Currency Tracking GR-1

GEOCHECK ADDENDUM
Physical Setting Source Addendum A-1
Physical Setting Source Summary A-2
Physical Setting SSURGO Soil Map A-5
Physical Setting Source Map A-12
Physical Setting Source Map Findings A-14
Physical Setting Source Records Searched PSGR-1
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TC7818767.2s Page 1

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 1
A search of available environmental records was conducted by Environmental Data Resources, Inc (EDR).

The report was designed to assist parties seeking to meet the search requirements of EPA’s Standards and Practices for All Appropriate Inquiries (40 CFR Part 312), the ASTM Standard Practice for Environmental Site Assessments (E1527 - 21), the ASTM Standard Practice for Environmental Site Assessments for Forestland or Rural Property (E2247 - 16), the ASTM Standard Practice for Limited Environmental Due Diligence: Transaction Screen Process (E1528 - 22) or custom requirements developed for the evaluation of environmental risk associated with a parcel of real estate.

TARGET PROPERTY INFORMATION

ADDRESS

TECHNOLOGY WAY AND BRENTWOOD BOULEVARD
BRENTWOOD, CA 94513

COORDINATES
Latitude (North): 37.9440440 - 37˚ 56’ 38.55’’
Longitude (West): 121.6979200 - 121˚ 41’ 52.51’’
Universal Tranverse Mercator: Zone 10
UTM X (Meters): 614411.2
UTM Y (Meters): 4200200.5
Elevation: 68 ft. above sea level

USGS TOPOGRAPHIC MAP ASSOCIATED WITH TARGET PROPERTY
Target Property Map: 50003342 BRENTWOOD, CA
Version Date: 2021

AERIAL PHOTOGRAPHY IN THIS REPORT
Portions of Photo from: 20200525
Source: USDA

7818767.2s Page 2
39 ISAAC MONTANEZ 151 LYNN DRIVE RCRA NonGen / NLR, E MANIFEST Higher 958, 0.181, South G38 7570 BRENTWOOD 7455 BRENTWOOD BLVD CONTRA COSTA SITES, CERS Lower 945, 0.179, NNE F37 BRENTWOOD PETROLEUM 7920 BRENTWOOD BLVD UST FINDER Higher 940, 0.178, SSE F36 BEACON STATION #3544 7920 BRENTWOOD BLVD UST Higher 940, 0.178, SSE F35 USA GASOLINE CORPORA 7920 BRENTWOOD BLVD RCRA-SQG Higher 940, 0.178, SSE F34 BRENTWOOD PETROLEUM 7920 BRENTWOOD BLVD UST Higher 940, 0.178, SSE F33 BEACON #3544 (FORMER 7920 BRENTWOOD BLVD LUST, CERS HAZ WASTE, SWEEPS UST, CA FID UST, CERS...Higher 940, 0.178, SSE F32 BEACON #3544 (FORMER 7920 BRENTWOOD BLVD UST FINDER RELEASE Higher 940, 0.178, SSE F31 K & D RV SERVICE 7893 BRENTWOOD BLVD CONTRA COSTA SITES Higher 929, 0.176, SSE E30 IRS 1 HR CLEANERS 41 SAND CREEK RD B CONTRA COSTA SITES Lower 907, 0.172, NNE E29 IRS ONE HOUR CLEANER 41 SANDCREEK RD# B RCRA-SQG, DRYCLEANERS Lower 907, 0.172, NNE F28 D&N AUTOWERKS TATT/B 7885 BRENTWOOD BLVD RCRA NonGen / NLR, E MANIFEST Higher 906, 0.172, SSE F27 BRENTWOOD TIRE CO 7885 BRENTWOOD BLVD UST Higher 906, 0.172, SSE F26 BRENTWOOD TIRE CO 7885 BRENTWOOD BLVD CERS HAZ WASTE, HWTS, HAZNET, CONTRA COSTA SITES,...Higher 906, 0.172, SSE E25 BRENTWOOD CAMPUS 101 SAND CREEK RD A CONTRA COSTA SITES Lower 894, 0.169, North 24 LYON WOODFIELD PROJE EAST FROM INTERSECTI CPS-SLIC Lower 849, 0.161, East D23 NAPA DC FRESNO 7881 BRENTWOOD BLVD RCRA NonGen / NLR, E MANIFEST Higher 766, 0.145, SSE D22 BRENTWOOD AUTO PARTS 7881 BRENTWOOD BLVD HWTS, HAZNET, CONTRA COSTA SITES Higher 766, 0.145, SSE E21 PANDA EXPRESS #3500 40 SAND CREEK RD CONTRA COSTA SITES, CERS Lower 748, 0.142, North 20 ANGIE GUZMAN 197 CURTIS DRIVE RCRA NonGen / NLR Higher 742, 0.141, SW B19 BEACON STATION 544 1380 HIGHWAY 4 HIST UST Higher 625, 0.118, SSE 18 CSP I, LP DBA BRENTW 190 SAND CREEK RD RCRA NonGen / NLR Higher 616, 0.117, NNW D17 DOLLAR GENERAL #1358 7820 BRENTWOOD BLVD CERS HAZ WASTE, HWTS, HAZNET, CONTRA COSTA SITES,...Higher 593, 0.112, SE D16 DOLLAR GENERAL STORE 7820 BRENTWOOD BLVD RCRA NonGen / NLR, E MANIFEST Higher 593, 0.112, SE 15 TRINIDAD OLIVARES 222 NANCY STREET RCRA NonGen / NLR, E MANIFEST Lower 548, 0.104, ESE B14 BRENTWOOD SHELL SERV 1355 HIGHWAY 4 HIST UST Higher 546, 0.103, SSE C13 WESTERN DENTAL SERVI 7603 BRENTWOOD BLVD CONTRA COSTA SITES Lower 543, 0.103, NE C12 WESTERN DENTAL AND O 7603 BRENTWOOD BLVD RCRA NonGen / NLR Lower 543, 0.103, NE C11 WESTERN DENTAL SERVI 7603 BRENTWOOD BLVD CERS HAZ WASTE Lower 543, 0.103, NE C10 AUTOZONE 4136 7609 BRENTWOOD BLVD CERS HAZ WASTE, HWTS, HAZNET, CONTRA COSTA SITES,...Lower 498, 0.094, NE C9 AUTOZONE #4136 7609 BRENTWOOD BLVD RCRA NonGen / NLR, E MANIFEST Lower 498, 0.094, NE C8 PITTS FAMILY MARKET 7610 BRENTWOOD BLVD RCRA NonGen / NLR Lower 487, 0.092, NE C7 BRENTWOOD GROCERY OU 7610 BRENTWOOD BLVD CONTRA COSTA SITES Lower 487, 0.092, NE B6 MANGINI BROTHERS 7865 BRENTWOOD BLVD CONTRA COSTA SITES Higher 476, 0.090, SE B5 MANGINI BROS 7865 BRENTWOOD BLVD RCRA NonGen / NLR Higher 476, 0.090, SE B4 BRENTWOOD SHELL SERV 1355 HIGHWAY 4 SWEEPS UST, CA FID UST Higher 437, 0.083, SSE A3 TACO BELL 30762 7814 BRENTWOOD BLVD CONTRA COSTA SITES, CERS Higher 349, 0.066, SE A2 STRONG-BROWN 204, IN 7810 BRENTWOOD BLVD CONTRA COSTA SITES, CERS Higher 201, 0.038, ESE 1 JACK IN THE BOX #434 60 TECHNOLOGY WAY CONTRA COSTA SITES, CERS Higher 97, 0.018, NE

MAPPED SITES SUMMARY
Target Property Address:

TECHNOLOGY WAY AND BRENTWOOD BOULEVARD
BRENTWOOD, CA 94513
Click on Map ID to see full detail.

MAP RELATIVE DIST (ft. & mi.)

ID DATABASE ACRONYMS ELEVATION DIRECTION SITE NAME ADDRESS

7818767.2s Page 3
K69 BRISTOW MIDDLE SCHOO 855 MINNESOTA AVENUE ENVIROSTOR, SCH Higher 4986, 0.944, WSW K68 BRISTOW MIDDLE SCHOO 855 MINNESOTA AVENUE ENVIROSTOR, SCH, NPDES, CIWQS, CERS Higher 4986, 0.944, WSW 67 WILDFLOWER EXPANSION GARIN ROAD AND OAK S ENVIROSTOR, SCH Lower 4170, 0.790, SE 66 SAND CREEK ELEMENTAR SAND CREEK ROAD/GARI ENVIROSTOR, SCH Lower 2538, 0.481, ENE J65 BRENTWOOD SUB STATIO 29 SPRUCE ST UST FINDER RELEASE Higher 2202, 0.417, SSE J64 DIABLO VALLEY MOSQUI 29 SPRUCE ST LUST, SWEEPS UST, CA FID UST, Cortese, HIST... Higher 2202, 0.417, SSE 63 SCIORTINO WELL AREA BRENTWOOD BLVD CPS-SLIC Lower 2050, 0.388, NE 62 SAVER’S SS 2323 HWY 4 LUST, HIST CORTESE Higher 1814, 0.344, SE 61 JACK L ROBBINS MARSH CREEK ROAD CPS-SLIC, HIST UST Lower 1565, 0.296, NE H60 BRENTWOOD HEALTH CEN 171 SAND CREEK RD RCRA NonGen / NLR, E MANIFEST Lower 1280, 0.242, NNW H59 BRENTWOOD HEALTH CEN 171 SAND CREEK RD HWTS, HAZNET, CONTRA COSTA SITES Lower 1280, 0.242, NNW H58 BRENTWOOD HEALTH CEN 171 SAND CREEK RD ST CERS HAZ WASTE Lower 1280, 0.242, NNW I57 SPEEDEE AND MIDAS - 7377 BRENTWOOD BLVD RCRA NonGen / NLR, E MANIFEST Lower 1252, 0.237, NNE I56 SPEEDEE OIL CHANGE A 7377 BRENTWOOD BLVD RCRA NonGen / NLR Lower 1252, 0.237, NNE I55 SPEEDEE OIL CHANGE & 7377 BRENTWOOD BLVD AST, CERS HAZ WASTE, CERS TANKS, CHMIRS, CONTRA... Lower 1252, 0.237, NNE 54 NADLER-PELEG PARTNER 30 BRODERICK DR, RCRA NonGen / NLR, E MANIFEST Higher 1194, 0.226, South H53 MILLER NELSON ANALYT 181 SAND CREEK RD BL RCRA NonGen / NLR Lower 1149, 0.218, NNW H52 MILLER NELSON ANALYT 181 SAND CREEK RD D CONTRA COSTA SITES Lower 1149, 0.218, NNW F51 SAVER’S SS 2323 HWY 4 LUST, Cortese Higher 1093, 0.207, SSE 50 ALLISON STEVENSON SR 1346 ELLEN LN RCRA NonGen / NLR, E MANIFEST Higher 1091, 0.207, SSW F49 JEELS INVESTMENTS, L 7940 BRENTWOOD BOULE RCRA NonGen / NLR Higher 1091, 0.207, SSE F48 FIRST STOP AUTO MART 7935 BRENTWOOD BLVD LUST, UST, CERS HAZ WASTE, SWEEPS UST, Cortese,... Higher 1043, 0.198, SSE F47 FIRST STOP GAS 7935 BRENTWOOD BLVD UST FINDER RELEASE Higher 1043, 0.198, SSE G46 QUICK QUACK CAR WASH 7450 BRENTWOOD BLVD HWTS, CONTRA COSTA SITES, CIWQS, CERS Lower 1022, 0.194, NNE G45 7-ELEVEN 38723 7450 BRENTWOOD BLVD RCRA NonGen / NLR Lower 1022, 0.194, NNE G44 7-ELEVEN #38723 7460 BRENTWOOD BLVD CERS HAZ WASTE, CERS TANKS, EMI, HWTS, CONTRA... Lower 985, 0.187, NNE G43 7-ELEVEN 38723 7460 BRENTWOOD BLVD RCRA NonGen / NLR, E MANIFEST Lower 985, 0.187, NNE G42 7-ELEVEN INC. #38723 7460 BRENTWOOD BLVD UST Lower 985, 0.187, NNE F41 F & G MOTORS 7911 BRENTWOOD BLVD RCRA NonGen / NLR Higher 977, 0.185, SSE F40 BYER’S AUTO BODY, IN 7911 BRENTWOOD BLVD EMI, CONTRA COSTA SITES Higher 977, 0.185, SSE

MAPPED SITES SUMMARY
Target Property Address:

TECHNOLOGY WAY AND BRENTWOOD BOULEVARD
BRENTWOOD, CA 94513
Click on Map ID to see full detail.

MAP RELATIVE DIST (ft. & mi.)

ID DATABASE ACRONYMS ELEVATION DIRECTION SITE NAME ADDRESS

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 4

TARGET PROPERTY SEARCH RESULTS
The target property was not listed in any of the databases searched by EDR.

DATABASES WITH NO MAPPED SITES
No mapped sites were found in EDR’s search of available ("reasonably ascertainable ") government records either on the target property or within the search radius around the target property for the following databases:

STANDARD ENVIRONMENTAL RECORDS
Lists of Federal NPL (Superfund) sites
NPL National Priority List
Proposed NPL Proposed National Priority List Sites
NPL LIENS Federal Superfund Liens
Lists of Federal Delisted NPL sites
Delisted NPL National Priority List Deletions
Lists of Federal sites subject to CERCLA removals and CERCLA orders FEDERAL FACILITY Federal Facility Site Information listing SEMS Superfund Enterprise Management System
Lists of Federal CERCLA sites with NFRAP
SEMS-ARCHIVE Superfund Enterprise Management System Archive Lists of Federal RCRA facilities undergoing Corrective Action CORRACTS Corrective Action Report
Lists of Federal RCRA TSD facilities
RCRA-TSDF RCRA - Treatment, Storage and Disposal
Lists of Federal RCRA generators
RCRA-LQG RCRA - Large Quantity Generators
RCRA-VSQG RCRA - Very Small Quantity Generators (Formerly Conditionally Exempt Small Quantity Generators)
Federal institutional controls / engineering controls registries LUCIS Land Use Control Information System
US ENG CONTROLS Engineering Controls Sites List

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 5
US INST CONTROLS Institutional Controls Sites List
Federal ERNS list
ERNS Emergency Response Notification System
Lists of state- and tribal (Superfund) equivalent sites RESPONSE State Response Sites
Lists of state and tribal landfills and solid waste disposal facilities SWF/LF Solid Waste Information System
Lists of state and tribal leaking storage tanks
INDIAN LUST Leaking Underground Storage Tanks on Indian Land Lists of state and tribal registered storage tanks
FEMA UST Underground Storage Tank Listing
INDIAN UST Underground Storage Tanks on Indian Land
Lists of state and tribal voluntary cleanup sites
INDIAN VCP Voluntary Cleanup Priority Listing
VCP Voluntary Cleanup Program Properties
Lists of state and tribal brownfield sites
BROWNFIELDS Considered Brownfieds Sites Listing

ADDITIONAL ENVIRONMENTAL RECORDS
Local Brownfield lists
US BROWNFIELDS A Listing of Brownfields Sites
Local Lists of Landfill / Solid Waste Disposal Sites
WMUDS/SWAT Waste Management Unit Database
SWRCY Recycler Database
HAULERS Registered Waste Tire Haulers Listing
INDIAN ODI Report on the Status of Open Dumps on Indian Lands ODI Open Dump Inventory
DEBRIS REGION 9 Torres Martinez Reservation Illegal Dump Site Locations IHS OPEN DUMPS Open Dumps on Indian Land
Local Lists of Hazardous waste / Contaminated Sites
US HIST CDL Delisted National Clandestine Laboratory Register HIST Cal-Sites Historical Calsites Database
SCH School Property Evaluation Program
CDL Clandestine Drug Labs

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 6
Toxic Pits Toxic Pits Cleanup Act Sites
US CDL National Clandestine Laboratory Register
Local Land Records
LIENS Environmental Liens Listing
LIENS 2 CERCLA Lien Information
DEED Deed Restriction Listing
Records of Emergency Release Reports
HMIRS Hazardous Materials Information Reporting System
CHMIRS California Hazardous Material Incident Report System LDS Land Disposal Sites Listing
MCS Military Cleanup Sites Listing
SPILLS 90 SPILLS 90 data from FirstSearch
Other Ascertainable Records
FUDS Formerly Used Defense Sites
DOD Department of Defense Sites
SCRD DRYCLEANERS State Coalition for Remediation of Drycleaners Listing US FIN ASSUR Financial Assurance Information

EPA WATCH LIST EPA WATCH LIST
2020 COR ACTION 2020 Corrective Action Program List
TSCA Toxic Substances Control Act
TRIS Toxic Chemical Release Inventory System
SSTS Section 7 Tracking Systems
ROD Records Of Decision
RMP Risk Management Plans
RAATS RCRA Administrative Action Tracking System
PRP Potentially Responsible Parties
PADS PCB Activity Database System
ICIS Integrated Compliance Information System
FTTS FIFRA/ TSCA Tracking System - FIFRA (Federal Insecticide, Fungicide, & Rodenticide Act)/TSCA (Toxic Substances Control Act)
MLTS Material Licensing Tracking System
COAL ASH DOE Steam-Electric Plant Operation Data
COAL ASH EPA Coal Combustion Residues Surface Impoundments List PCB TRANSFORMER PCB Transformer Registration Database
RADINFO Radiation Information Database
HIST FTTS FIFRA/TSCA Tracking System Administrative Case Listing DOT OPS Incident and Accident Data
CONSENT Superfund (CERCLA) Consent Decrees
INDIAN RESERV Indian Reservations
FUSRAP Formerly Utilized Sites Remedial Action Program
UMTRA Uranium Mill Tailings Sites
LEAD SMELTERS Lead Smelter Sites
US AIRS Aerometric Information Retrieval System Facility Subsystem US MINES Mines Master Index File
ABANDONED MINES Abandoned Mines
MINES MRDS Mineral Resources Data System
FINDS Facility Index System/Facility Registry System
UXO Unexploded Ordnance Sites
DOCKET HWC Hazardous Waste Compliance Docket Listing

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 7
ECHO Enforcement & Compliance History Information
FUELS PROGRAM EPA Fuels Program Registered Listing
PFAS NPL Superfund Sites with PFAS Detections Information PFAS FEDERAL SITES Federal Sites PFAS Information
PFAS TRIS List of PFAS Added to the TRI
PFAS TSCA PFAS Manufacture and Imports Information
PFAS RCRA MANIFEST PFAS Transfers Identified In the RCRA Database Listing PFAS ATSDR PFAS Contamination Site Location Listing
PFAS WQP Ambient Environmental Sampling for PFAS
PFAS NPDES Clean Water Act Discharge Monitoring Information

PFAS PROJECT NORTHEASTERN UNIVERSITY PFAS PROJECT
PFAS ECHO Facilities in Industries that May Be Handling PFAS Listing PFAS ECHO FIRE TRAIN Facilities in Industries that May Be Handling PFAS Listing PFAS PT 139 AIRPORT All Certified Part 139 Airports PFAS Information Listing AQUEOUS FOAM NRC Aqueous Foam Related Incidents Listing BIOSOLIDS ICIS-NPDES Biosolids Facility Data
PFAS PFAS Investigation Site Location Listing
AQUEOUS FOAM Former Fire Training Facility Assessments Listing CA BOND EXP. PLAN Bond Expenditure Plan
CHROME PLATING Chrome Plating Facilities Listing
CUPA Listings CUPA Resources List
EMI Emissions Inventory Data
ENF Enforcement Action Listing
Financial Assurance Financial Assurance Information Listing ICE Inspection, Compliance and Enforcement
HWP EnviroStor Permitted Facilities Listing
HWT Registered Hazardous Waste Transporter Database
HWTS Hazardous Waste Tracking System
HAZNET Facility and Manifest Data
MINES Mines Site Location Listing
MWMP Medical Waste Management Program Listing
NPDES NPDES Permits Listing
PEST LIC Pesticide Regulation Licenses Listing
PROC Certified Processors Database
Notify 65 Proposition 65 Records
HAZMAT Hazardous Material Facilities
UIC UIC Listing

UIC GEO UIC GEO (GEOTRACKER)
WASTEWATER PITS Oil Wastewater Pits Listing
WDS Waste Discharge System
WIP Well Investigation Program Case List

MILITARY PRIV SITES MILITARY PRIV SITES (GEOTRACKER)

PROJECT PROJECT (GEOTRACKER)
WDR Waste Discharge Requirements Listing
CIWQS California Integrated Water Quality System

CERS CERS

NON-CASE INFO NON-CASE INFO (GEOTRACKER)

OTHER OIL GAS OTHER OIL & GAS (GEOTRACKER)

PROD WATER PONDS PROD WATER PONDS (GEOTRACKER)

SAMPLING POINT SAMPLING POINT (GEOTRACKER)
WELL STIM PROJ Well Stimulation Project (GEOTRACKER)

EDR HIGH RISK HISTORICAL RECORDS
EDR Exclusive Records
EDR MGP EDR Proprietary Manufactured Gas Plants

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 8
EDR Hist Auto EDR Exclusive Historical Auto Stations
EDR Hist Cleaner EDR Exclusive Historical Cleaners

EDR RECOVERED GOVERNMENT ARCHIVES
Exclusive Recovered Govt. Archives
RGA LF Recovered Government Archive Solid Waste Facilities List RGA LUST Recovered Government Archive Leaking Underground Storage Tank SURROUNDING SITES: SEARCH RESULTS
Surrounding sites were identified in the following databases.

Elevations have been determined from the USGS Digital Elevation Model and should be evaluated on a relative (not an absolute) basis. Relative elevation information between sites of close proximity should be field verified. Sites with an elevation equal to or higher than the target property have been differentiated below from sites with an elevation lower than the target property.

Page numbers and map identification numbers refer to the EDR Radius Map report where detailed data on individual sites can be reviewed.

Sites listed in bold italics are in multiple databases.

Unmappable (orphan) sites are not considered in the foregoing analysis.

STANDARD ENVIRONMENTAL RECORDS
Lists of Federal RCRA generators
RCRA-SQG: RCRAInfo is EPA’s comprehensive information system, providing access to data supporting the Resource Conservation and Recovery Act (RCRA) of 1976 and the Hazardous and Solid Waste Amendments (HSWA) of 1984. The database includes selective information on sites which generate, transport, store, treat and/or dispose of hazardous waste as defined by the Resource Conservation and Recovery Act (RCRA). Small quantity generators (SQGs) generate between 100 kg and 1,000 kg of hazardous waste per month.

A review of the RCRA-SQG list, as provided by EDR, and dated 06/03/2024 has revealed that there are 2 RCRA-SQG sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ USA GASOLINE CORPORA 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F35 256 EPA ID:: CAR000142398
Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ IRS ONE HOUR CLEANER 41 SANDCREEK RD# B NNE 1/8 - 1/4 (0.172 mi.) E29 215 EPA ID:: CAD981396724

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 9
Lists of state- and tribal hazardous waste facilities
ENVIROSTOR: The Department of Toxic Substances Control’s (DTSC’s) Site Mitigation and Brownfields Reuse Program’s (SMBRP’s) EnviroStor database identifes sites that have known contamination or sites for which there may be reasons to investigate further. The database includes the following site types: Federal Superfund sites (National Priorities List (NPL)); State Response, including Military Facilities and State Superfund; Voluntary Cleanup; and School sites. EnviroStor provides similar information to the information that was available in CalSites, and provides additional site information, including, but not limited to, identification of formerly-contaminated properties that have been released for reuse, properties where environmental deed restrictions have been recorded to prevent inappropriate land uses, and risk characterization information that is used to assess potential impacts to public health and the environment at contaminated sites.

A review of the ENVIROSTOR list, as provided by EDR, and dated 07/22/2024 has revealed that there are 4 ENVIROSTOR sites within approximately 1 mile of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BRISTOW MIDDLE SCHOO 855 MINNESOTA AVENUE WSW 1/2 - 1 (0.944 mi.) K68 446 Facility Id: 60003041
Status: No Further Action
BRISTOW MIDDLE SCHOO 855 MINNESOTA AVENUE WSW 1/2 - 1 (0.944 mi.) K69 452 Facility Id: 07010006
Status: No Action Required
Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ SAND CREEK ELEMENTAR SAND CREEK ROAD/GARI ENE 1/4 - 1/2 (0.481 mi.) 66 440 Facility Id: 07100004
Status: No Further Action
WILDFLOWER EXPANSION GARIN ROAD AND OAK S SE 1/2 - 1 (0.790 mi.) 67 443 Facility Id: 70000174
Status: No Further Action
Lists of state and tribal leaking storage tanks
LUST: Leaking Underground Storage Tank (LUST) Sites included in GeoTracker. GeoTracker is the Water Boards data management system for sites that impact, or have the potential to impact, water quality in California, with emphasis on groundwater.

A review of the LUST list, as provided by EDR, has revealed that there are 5 LUST sites within approximately 0.5 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BEACON #3544 (FORMER 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F33 219 Database: LUST REG 5, Date of Government Version: 07/01/2008 Database: LUST, Date of Government Version: 08/28/2024
Status: Completed - Case Closed
Status: Preliminary site assessment workplan submitted
Global Id: T0601300802
FIRST STOP AUTO MART 7935 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.198 mi.) F48 302 Database: LUST REG 5, Date of Government Version: 07/01/2008 Database: LUST, Date of Government Version: 08/28/2024

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 10
Status: Open - Remediation
Global Id: T0601343310
SAVER’S SS 2323 HWY 4 SSE 1/8 - 1/4 (0.207 mi.) F51 336 Database: LUST REG 5, Date of Government Version: 07/01/2008 Status: Case Closed
SAVER’S SS 2323 HWY 4 SE 1/4 - 1/2 (0.344 mi.) 62 432
Database: LUST, Date of Government Version: 08/28/2024
Status: Completed - Case Closed
Global Id: T0601300755
DIABLO VALLEY MOSQUI 29 SPRUCE ST SSE 1/4 - 1/2 (0.417 mi.) J64 435 Database: LUST REG 5, Date of Government Version: 07/01/2008 Database: LUST, Date of Government Version: 08/28/2024
Status: Completed - Case Closed
Status: Case Closed
Global Id: T0601300750
CPS-SLIC: Cleanup Program Sites (CPS; also known as Site Cleanups [SC] and formerly known as Spills, Leaks, Investigations, and Cleanups [SLIC] sites) included in GeoTracker. GeoTracker is the Water Boards data management system for sites that impact, or have the potential to impact, water quality in California, with emphasis on groundwater.

A review of the CPS-SLIC list, as provided by EDR, has revealed that there are 3 CPS-SLIC sites within approximately 0.5 miles of the target property.

Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ LYON WOODFIELD PROJE EAST FROM INTERSECTI E 1/8 - 1/4 (0.161 mi.) 24 194 Database: CPS-SLIC, Date of Government Version: 08/28/2024 Global Id: SLT5S1843223
Facility Status: Completed - Case Closed
JACK L ROBBINS MARSH CREEK ROAD NE 1/4 - 1/2 (0.296 mi.) 61 431 Database: CPS-SLIC, Date of Government Version: 08/28/2024 Global Id: SLT5S1283168
Facility Status: Completed - Case Closed
SCIORTINO WELL AREA BRENTWOOD BLVD NE 1/4 - 1/2 (0.388 mi.) 63 434 Database: CPS-SLIC, Date of Government Version: 08/28/2024 Global Id: SL0601397127
Facility Status: Completed - Case Closed
Lists of state and tribal registered storage tanks
UST: The Underground Storage Tank database contains registered USTs. USTs are regulated under Subtitle I of the Resource Conservation and Recovery Act (RCRA). The data come from the State Water Resources Control Board’s Hazardous Substance Storage Container Database.

A review of the UST list, as provided by EDR, has revealed that there are 5 UST sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BRENTWOOD TIRE CO 7885 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.172 mi.) F27 208 Database: UST, Date of Government Version: 08/28/2024

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 11
Facility Id: 07-000-772601
BRENTWOOD PETROLEUM 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F34 253 Database: UST, Date of Government Version: 08/28/2024
Facility Id: 07-000-738853
BEACON STATION #3544 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F36 258 Database: UST, Date of Government Version: 08/28/2024
Facility Id: 738853
FIRST STOP AUTO MART 7935 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.198 mi.) F48 302 Database: UST, Date of Government Version: 08/28/2024
Facility Id: 748792
Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ 7-ELEVEN INC. #38723 7460 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.187 mi.) G42 275 Database: UST, Date of Government Version: 08/28/2024
Facility Id: 07-000-776676
AST: A listing of aboveground storage tank petroleum storage tank locations.

A review of the AST list, as provided by EDR, has revealed that there is 1 AST site within approximately 0.25 miles of the target property.

Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ SPEEDEE OIL CHANGE & 7377 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.237 mi.) I55 347 Database: AST, Date of Government Version: 07/06/2016

ADDITIONAL ENVIRONMENTAL RECORDS
Local Lists of Hazardous waste / Contaminated Sites
CERS HAZ WASTE: List of sites in the California Environmental Protection Agency (CalEPA) Regulated Site Portal which fall under the Hazardous Chemical Management, Hazardous Waste Onsite Treatment, Household Hazardous Waste Collection, Hazardous Waste Generator, and RCRA LQ HW Generator programs.

A review of the CERS HAZ WASTE list, as provided by EDR, and dated 07/10/2024 has revealed that there are 9 CERS HAZ WASTE sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ DOLLAR GENERAL #1358 7820 BRENTWOOD BLVD SE 0 - 1/8 (0.112 mi.) D17 122 BRENTWOOD TIRE CO 7885 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.172 mi.) F26 195 BEACON #3544 (FORMER 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F33 219 FIRST STOP AUTO MART 7935 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.198 mi.) F48 302 Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ AUTOZONE 4136 7609 BRENTWOOD BLVD NE 0 - 1/8 (0.094 mi.) C10 45 WESTERN DENTAL SERVI 7603 BRENTWOOD BLVD NE 0 - 1/8 (0.103 mi.) C11 101 7-ELEVEN #38723 7460 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.187 mi.) G44 284 SPEEDEE OIL CHANGE & 7377 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.237 mi.) I55 347 BRENTWOOD HEALTH CEN 171 SAND CREEK RD ST NNW 1/8 - 1/4 (0.242 mi.) H58 382

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 12
Local Lists of Registered Storage Tanks
SWEEPS UST: Statewide Environmental Evaluation and Planning System. This underground storage tank listing was updated and maintained by a company contacted by the SWRCB in the early 1990’s. The listing is no longer updated or maintained. The local agency is the contact for more information on a site on the SWEEPS list.

A review of the SWEEPS UST list, as provided by EDR, and dated 06/01/1994 has revealed that there are 3 SWEEPS UST sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BRENTWOOD SHELL SERV 1355 HIGHWAY 4 SSE 0 - 1/8 (0.083 mi.) B4 27 Status: A
Tank Status: A
Comp Number: 48792
BEACON #3544 (FORMER 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F33 219 Status: A
Tank Status: A
Comp Number: 38853
FIRST STOP AUTO MART 7935 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.198 mi.) F48 302 Status: A
Tank Status: A
Comp Number: 48791
HIST UST: Historical UST Registered Database.

A review of the HIST UST list, as provided by EDR, and dated 10/15/1990 has revealed that there are 2 HIST UST sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BRENTWOOD SHELL SERV 1355 HIGHWAY 4 SSE 0 - 1/8 (0.103 mi.) B14 105 Facility Id: 00000048792
BEACON STATION 544 1380 HIGHWAY 4 SSE 0 - 1/8 (0.118 mi.) B19 182 Facility Id: 00000038853
CERS TANKS: List of sites in the California Environmental Protection Agency (CalEPA) Regulated Site Portal which fall under the Aboveground Petroleum Storage and Underground Storage Tank regulatory programs.

A review of the CERS TANKS list, as provided by EDR, and dated 07/10/2024 has revealed that there are 3 CERS TANKS sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BEACON #3544 (FORMER 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F33 219 Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ 7-ELEVEN #38723 7460 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.187 mi.) G44 284 SPEEDEE OIL CHANGE & 7377 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.237 mi.) I55 347

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 13
CA FID UST: The Facility Inventory Database contains active and inactive underground storage tank locations. The source is the State Water Resource Control Board.

A review of the CA FID UST list, as provided by EDR, and dated 10/31/1994 has revealed that there are 2 CA FID UST sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BRENTWOOD SHELL SERV 1355 HIGHWAY 4 SSE 0 - 1/8 (0.083 mi.) B4 27 Facility Id: 07001416
Status: A
BEACON #3544 (FORMER 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F33 219 Facility Id: 07001385
Status: A
Other Ascertainable Records
RCRA NonGen / NLR: RCRAInfo is EPA’s comprehensive information system, providing access to data supporting the Resource Conservation and Recovery Act (RCRA) of 1976 and the Hazardous and Solid Waste Amendments (HSWA) of 1984. The database includes selective information on sites which generate, transport, store, treat and/or dispose of hazardous waste as defined by the Resource Conservation and Recovery Act (RCRA). Non-Generators do not presently generate hazardous waste.

A review of the RCRA NonGen / NLR list, as provided by EDR, and dated 06/03/2024 has revealed that there are 21 RCRA NonGen / NLR sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ MANGINI BROS 7865 BRENTWOOD BLVD SE 0 - 1/8 (0.090 mi.) B5 28 EPA ID:: CAL000381747
DOLLAR GENERAL STORE 7820 BRENTWOOD BLVD SE 0 - 1/8 (0.112 mi.) D16 110 EPA ID:: CAL000373075
CSP I, LP DBA BRENTW 190 SAND CREEK RD NNW 0 - 1/8 (0.117 mi.) 18 179 EPA ID:: CAC003228007
ANGIE GUZMAN 197 CURTIS DRIVE SW 1/8 - 1/4 (0.141 mi.) 20 182 EPA ID:: CAC003271765
NAPA DC FRESNO 7881 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.145 mi.) D23 188 EPA ID:: CAL000064019
D&N AUTOWERKS TATT/B 7885 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.172 mi.) F28 209 EPA ID:: CAL000432597
ISAAC MONTANEZ 151 LYNN DRIVE S 1/8 - 1/4 (0.181 mi.) 39 265 EPA ID:: CAC003129850
F & G MOTORS 7911 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.185 mi.) F41 273 EPA ID:: CAL000404754
JEELS INVESTMENTS, L 7940 BRENTWOOD BOULE SSE 1/8 - 1/4 (0.207 mi.) F49 330 EPA ID:: CAC003284818
ALLISON STEVENSON SR 1346 ELLEN LN SSW 1/8 - 1/4 (0.207 mi.) 50 332 EPA ID:: CAC002993633
NADLER-PELEG PARTNER 30 BRODERICK DR, S 1/8 - 1/4 (0.226 mi.) 54 340 EPA ID:: CAC003160370
Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ PITTS FAMILY MARKET 7610 BRENTWOOD BLVD NE 0 - 1/8 (0.092 mi.) C8 31

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 14
EPA ID:: CAL000483912
AUTOZONE #4136 7609 BRENTWOOD BLVD NE 0 - 1/8 (0.094 mi.) C9 33 EPA ID:: CAL000384117
WESTERN DENTAL AND O 7603 BRENTWOOD BLVD NE 0 - 1/8 (0.103 mi.) C12 103 EPA ID:: CAL000464551
TRINIDAD OLIVARES 222 NANCY STREET ESE 0 - 1/8 (0.104 mi.) 15 106 EPA ID:: CAC003153339
7-ELEVEN 38723 7460 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.187 mi.) G43 277 EPA ID:: CAL000462087
7-ELEVEN 38723 7450 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.194 mi.) G45 294 EPA ID:: CAL000454841
MILLER NELSON ANALYT 181 SAND CREEK RD BL NNW 1/8 - 1/4 (0.218 mi.) H53 337 EPA ID:: CAL000468172
SPEEDEE OIL CHANGE A 7377 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.237 mi.) I56 369 EPA ID:: CAL000136086
SPEEDEE AND MIDAS - 7377 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.237 mi.) I57 371 EPA ID:: CAL000425569
BRENTWOOD HEALTH CEN 171 SAND CREEK RD NNW 1/8 - 1/4 (0.242 mi.) H60 419 EPA ID:: CAL000345341
UST FINDER RELEASE: US EPA’s UST Finder data is a national composite of leaking underground storage tanks.

This data contains information about, and locations of, leaking underground storage tanks. Data was collected from state sources and standardized into a national profile by EPA’s Office of Underground Storage Tanks, Office of Research and Development, and the Association of State and Territorial Solid Waste Management Officials.

A review of the UST FINDER RELEASE list, as provided by EDR, and dated 06/08/2023 has revealed that there are 3 UST FINDER RELEASE sites within approximately 0.5 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BEACON #3544 (FORMER 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F32 218 FIRST STOP GAS 7935 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.198 mi.) F47 301 BRENTWOOD SUB STATIO 29 SPRUCE ST SSE 1/4 - 1/2 (0.417 mi.) J65 439 UST FINDER: EPA developed UST Finder, a web map application containing a comprehensive, state-sourced national map of underground storage tank (UST) and leaking UST (LUST) data. It provides the attributes and locations of active and closed USTs, UST facilities, and LUST sites from states and from Tribal lands and US territories . UST Finder contains information about proximity of UST facilities and LUST sites to: surface and groundwater public drinking water protection areas; estimated number of private domestic wells and number of people living nearby; and flooding and wildfires.

A review of the UST FINDER list, as provided by EDR, and dated 06/08/2023 has revealed that there is 1 UST FINDER site within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BRENTWOOD PETROLEUM 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F37 259

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 15
E MANIFEST: EPA established a national system for tracking hazardous waste shipments electronically.

This system, known as ?e-Manifest,? will modernize the nation?s cradle-to-grave hazardous waste tracking process while saving valuable time, resources, and dollars for industry and states.

A review of the E MANIFEST list, as provided by EDR, and dated 07/24/2023 has revealed that there are 11 E MANIFEST sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ DOLLAR GENERAL STORE 7820 BRENTWOOD BLVD SE 0 - 1/8 (0.112 mi.) D16 110 NAPA DC FRESNO 7881 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.145 mi.) D23 188 D&N AUTOWERKS TATT/B 7885 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.172 mi.) F28 209 ISAAC MONTANEZ 151 LYNN DRIVE S 1/8 - 1/4 (0.181 mi.) 39 265 ALLISON STEVENSON SR 1346 ELLEN LN SSW 1/8 - 1/4 (0.207 mi.) 50 332 NADLER-PELEG PARTNER 30 BRODERICK DR, S 1/8 - 1/4 (0.226 mi.) 54 340 Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ AUTOZONE #4136 7609 BRENTWOOD BLVD NE 0 - 1/8 (0.094 mi.) C9 33 TRINIDAD OLIVARES 222 NANCY STREET ESE 0 - 1/8 (0.104 mi.) 15 106 7-ELEVEN 38723 7460 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.187 mi.) G43 277 SPEEDEE AND MIDAS - 7377 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.237 mi.) I57 371 BRENTWOOD HEALTH CEN 171 SAND CREEK RD NNW 1/8 - 1/4 (0.242 mi.) H60 419 Cortese: The sites for the list are designated by the State Water Resource Control Board (LUST), the Integrated Waste Board (SWF/LS), and the Department of Toxic Substances Control (Cal-Sites).

A review of the Cortese list, as provided by EDR, and dated 06/17/2024 has revealed that there are 4 Cortese sites within approximately 0.5 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BEACON #3544 (FORMER 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F33 219 Cleanup Status: COMPLETED - CASE CLOSED
FIRST STOP AUTO MART 7935 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.198 mi.) F48 302 Cleanup Status: OPEN - REMEDIATION
SAVER’S SS 2323 HWY 4 SSE 1/8 - 1/4 (0.207 mi.) F51 336 Cleanup Status: COMPLETED - CASE CLOSED
DIABLO VALLEY MOSQUI 29 SPRUCE ST SSE 1/4 - 1/2 (0.417 mi.) J64 435 Cleanup Status: COMPLETED - CASE CLOSED
DRYCLEANERS: A list of drycleaner related facilities that have EPA ID numbers. These are facilities with certain SIC codes: power laundries, family and commercial; garment pressing and cleaners’ agents; linen supply; coin-operated laundries and cleaning; drycleaning plants except rugs; carpet and upholster cleaning; industrial launderers; laundry and garment services.

A review of the DRYCLEANERS list, as provided by EDR, has revealed that there is 1 DRYCLEANERS site within approximately 0.25 miles of the target property.

Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ IRS ONE HOUR CLEANER 41 SANDCREEK RD# B NNE 1/8 - 1/4 (0.172 mi.) E29 215 Database: DRYCLEANERS, Date of Government Version: 04/02/2024 EPA Id: CAD981396724

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 16
HIST CORTESE: The sites for the list are designated by the State Water Resource Control Board [LUST], the Integrated Waste Board [SWF/LS], and the Department of Toxic Substances Control [CALSITES]. This listing is no longer updated by the state agency.

A review of the HIST CORTESE list, as provided by EDR, and dated 04/01/2001 has revealed that there are 3 HIST CORTESE sites within approximately 0.5 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BEACON #3544 (FORMER 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F33 219 Reg Id: 070084
SAVER’S SS 2323 HWY 4 SE 1/4 - 1/2 (0.344 mi.) 62 432
Reg Id: 070018
DIABLO VALLEY MOSQUI 29 SPRUCE ST SSE 1/4 - 1/2 (0.417 mi.) J64 435 Reg Id: 070012
CONTRA COSTA SITES: Lists includes sites from the Underground Tank Program, Hazardous Waste Generator Program & Business Plan 12185 Program
A review of the CONTRA COSTA SITES list, as provided by EDR, and dated 07/22/2024 has revealed that there are 23 CONTRA COSTA SITES sites within approximately 0.25 miles of the target property.

Equal/Higher Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ JACK IN THE BOX #434 60 TECHNOLOGY WAY NE 0 - 1/8 (0.018 mi.) 1 9 Facility Id: FA0037823
STRONG-BROWN 204, IN 7810 BRENTWOOD BLVD ESE 0 - 1/8 (0.038 mi.) A2 15 Facility Id: FA0037652
TACO BELL 30762 7814 BRENTWOOD BLVD SE 0 - 1/8 (0.066 mi.) A3 21 Facility Id: FA0040702
MANGINI BROTHERS 7865 BRENTWOOD BLVD SE 0 - 1/8 (0.090 mi.) B6 30 Facility Id: FA0033793
DOLLAR GENERAL #1358 7820 BRENTWOOD BLVD SE 0 - 1/8 (0.112 mi.) D17 122 Facility Id: FA0031761
BRENTWOOD AUTO PARTS 7881 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.145 mi.) D22 187 Facility Id: FA0037306
BRENTWOOD TIRE CO 7885 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.172 mi.) F26 195 Facility Id: FA0029286
K & D RV SERVICE 7893 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.176 mi.) F31 218 Facility Id: FA0029287
BEACON #3544 (FORMER 7920 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.178 mi.) F33 219 Facility Id: FA0032210
BYER’S AUTO BODY, IN 7911 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.185 mi.) F40 269 Facility Id: FA0036380
Facility Id: FA0027840
FIRST STOP AUTO MART 7935 BRENTWOOD BLVD SSE 1/8 - 1/4 (0.198 mi.) F48 302 Facility Id: FA0032337
Lower Elevation Address Direction / Distance Map ID Page ____________________ ________ ___________________ _____ _____ BRENTWOOD GROCERY OU 7610 BRENTWOOD BLVD NE 0 - 1/8 (0.092 mi.) C7 31

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 17
Facility Id: FA0047883
AUTOZONE 4136 7609 BRENTWOOD BLVD NE 0 - 1/8 (0.094 mi.) C10 45 Facility Id: FA0034137
WESTERN DENTAL SERVI 7603 BRENTWOOD BLVD NE 0 - 1/8 (0.103 mi.) C13 105 Facility Id: FA0045940
PANDA EXPRESS #3500 40 SAND CREEK RD N 1/8 - 1/4 (0.142 mi.) E21 185 Facility Id: FA0048144
BRENTWOOD CAMPUS 101 SAND CREEK RD A N 1/8 - 1/4 (0.169 mi.) E25 195 Facility Id: FA0038889
IRS 1 HR CLEANERS 41 SAND CREEK RD B NNE 1/8 - 1/4 (0.172 mi.) E30 218 Facility Id: FA0032965
7570 BRENTWOOD 7455 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.179 mi.) G38 260 Facility Id: FA0041308
7-ELEVEN #38723 7460 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.187 mi.) G44 284 Facility Id: FA0043693
QUICK QUACK CAR WASH 7450 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.194 mi.) G46 298 Facility Id: FA0045197
MILLER NELSON ANALYT 181 SAND CREEK RD D NNW 1/8 - 1/4 (0.218 mi.) H52 337 Facility Id: FA0046464
SPEEDEE OIL CHANGE & 7377 BRENTWOOD BLVD NNE 1/8 - 1/4 (0.237 mi.) I55 347 Facility Id: FA0028265
BRENTWOOD HEALTH CEN 171 SAND CREEK RD NNW 1/8 - 1/4 (0.242 mi.) H59 385 Facility Id: FA0033892

EXECUTIVE SUMMARY
TC7818767.2s EXECUTIVE SUMMARY 18
Due to poor or inadequate address information, the following sites were not mapped. Count: 5 records.

Site Name Database(s)
____________ ____________

LYON WOODFIELD PROJECT - BRENTWOOD CPS-SLIC

DOW CHEMICAL COMPANY - MARSH CREEK CPS-SLIC
STATE ROUTE 4 BYPASS AUTHORITY CPS-SLIC

VENTURINI LEASE SITE (BRENTWOOD OI CPS-SLIC

COWELL RANCH/VINEYARDS AT MARSH CR CPS-SLIC

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80 80
80 OVERVIEW MAP - 7818767 .2S
N Target Property
.... Sites at elevations higher than
or equal to the target property □ ♦ Sites at elevations lower than N the target property N .1 Manufactured Gas Plants [:] National Priority List Sites ~
[2J Dept. Defense Sites ~
□
□
SITE NAME: APN 016-120-024
ADDRESS: Technology Way and Brentwood Boulevard
Brentwood CA 94513
LAT/LONG: 37.944044 / 121 .69792
0 1/4
Indian Reservations BIA
Power transmission lines
Pipelines
Special Flood Hazard Area (1%)

0.2% Annual Chance Flood Hazard
National Wetland Inventory
State Wetlands
1/2
lfflffl Areas of Concern
This report includes Interactive Map Layers to
display and/or hide map information. The
legend includes only those icons for the
default map view.

CLIENT: Baseline Environmental Cons.

CONTACT: Johnathan Rizzo-Mosbaugh
INQUIRY#: 7818767.2s
DATE: November 12, 2024 11 :51 am
Copyright © 2024 EDR, Inc.© 2015 Tom Tom Rel. 2015.

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N Target Property
.... Sites at elevations higher than
or equal to the target property
♦ Sites at elevations lower than
the target property
.1 Manufactured Gas Plants
• Sensitive Receptors
Q National Priority List Sites
[2J Dept. Defense Sites
SITE NAME: APN 016-120-024
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DETAIL MAP- 7818767.2S
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N Pipelines
~ Special Flood Hazard Area (1%)
~
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D National Wetland Inventory
D State Wetlands
118
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~o 24
♦
♦
:n
1/4Mlles
lfflffl Areas of Concern
This report includes Interactive Map Layers to
display and/or hide map information. The
legend includes only those icons for the
default map view.

CLIENT: Baseline Environmental Cons.

ADDRESS: Technology Way and Brentwood Boulevard
Brentwood CA 94513
CONTACT: Johnathan Rizzo-Mosbaugh
INQUIRY#: 7818767.2s
LAT/LONG: 37.944044 I 121 .69792 DATE: November 12, 2024 11 :52 am Copyright © 2024 EDR, Inc. © 2015 Tom Tom Rel. 2015.

MAP FINDINGS SUMMARY
Search
Distance Target Total
Database Property (Miles) < 1/8 1/8 - 1/4 1/4 - 1/2 1/2 - 1 > 1 Plotted

STANDARD ENVIRONMENTAL RECORDS
Lists of Federal NPL (Superfund) sites
NPL 1.000 0 0 0 0 NR 0
Proposed NPL 1.000 0 0 0 0 NR 0
NPL LIENS 1.000 0 0 0 0 NR 0
Lists of Federal Delisted NPL sites
Delisted NPL 1.000 0 0 0 0 NR 0
Lists of Federal sites subject to
CERCLA removals and CERCLA orders
FEDERAL FACILITY 0.500 0 0 0 NR NR 0
SEMS 0.500 0 0 0 NR NR 0
Lists of Federal CERCLA sites with NFRAP
SEMS-ARCHIVE 0.500 0 0 0 NR NR 0
Lists of Federal RCRA facilities
undergoing Corrective Action
CORRACTS 1.000 0 0 0 0 NR 0
Lists of Federal RCRA TSD facilities
RCRA-TSDF 0.500 0 0 0 NR NR 0
Lists of Federal RCRA generators
RCRA-LQG 0.250 0 0 NR NR NR 0
RCRA-SQG 0.250 0 2 NR NR NR 2
RCRA-VSQG 0.250 0 0 NR NR NR 0
Federal institutional controls /
engineering controls registries
LUCIS 0.500 0 0 0 NR NR 0
US ENG CONTROLS 0.500 0 0 0 NR NR 0
US INST CONTROLS 0.500 0 0 0 NR NR 0
Federal ERNS list
ERNS 0.001 0 NR NR NR NR 0
Lists of state- and tribal
(Superfund) equivalent sites
RESPONSE 1.000 0 0 0 0 NR 0
Lists of state- and tribal
hazardous waste facilities
ENVIROSTOR 1.000 0 0 1 3 NR 4
Lists of state and tribal landfills
and solid waste disposal facilities
SWF/LF 0.500 0 0 0 NR NR 0
TC7818767.2s Page 4

MAP FINDINGS SUMMARY
Search
Distance Target Total
Database Property (Miles) < 1/8 1/8 - 1/4 1/4 - 1/2 1/2 - 1 > 1 Plotted Lists of state and tribal leaking storage tanks
LUST 0.500 0 3 2 NR NR 5
INDIAN LUST 0.500 0 0 0 NR NR 0
CPS-SLIC 0.500 0 1 2 NR NR 3
Lists of state and tribal registered storage tanks
FEMA UST 0.250 0 0 NR NR NR 0
UST 0.250 0 5 NR NR NR 5
AST 0.250 0 1 NR NR NR 1
INDIAN UST 0.250 0 0 NR NR NR 0
Lists of state and tribal voluntary cleanup sites
INDIAN VCP 0.500 0 0 0 NR NR 0
VCP 0.500 0 0 0 NR NR 0
Lists of state and tribal brownfield sites
BROWNFIELDS 0.500 0 0 0 NR NR 0

ADDITIONAL ENVIRONMENTAL RECORDS
Local Brownfield lists
US BROWNFIELDS 0.500 0 0 0 NR NR 0
Local Lists of Landfill / Solid
Waste Disposal Sites
WMUDS/SWAT 0.500 0 0 0 NR NR 0
SWRCY 0.500 0 0 0 NR NR 0
HAULERS 0.001 0 NR NR NR NR 0
INDIAN ODI 0.500 0 0 0 NR NR 0
ODI 0.500 0 0 0 NR NR 0
DEBRIS REGION 9 0.500 0 0 0 NR NR 0
IHS OPEN DUMPS 0.500 0 0 0 NR NR 0
Local Lists of Hazardous waste /
Contaminated Sites
US HIST CDL 0.001 0 NR NR NR NR 0
HIST Cal-Sites 1.000 0 0 0 0 NR 0
SCH 0.250 0 0 NR NR NR 0
CDL 0.001 0 NR NR NR NR 0
Toxic Pits 1.000 0 0 0 0 NR 0
CERS HAZ WASTE 0.250 3 6 NR NR NR 9
US CDL 0.001 0 NR NR NR NR 0
Local Lists of Registered Storage Tanks
SWEEPS UST 0.250 1 2 NR NR NR 3
HIST UST 0.250 2 0 NR NR NR 2
CERS TANKS 0.250 0 3 NR NR NR 3
CA FID UST 0.250 1 1 NR NR NR 2
Local Land Records
LIENS 0.001 0 NR NR NR NR 0
TC7818767.2s Page 5

MAP FINDINGS SUMMARY
Search
Distance Target Total
Database Property (Miles) < 1/8 1/8 - 1/4 1/4 - 1/2 1/2 - 1 > 1 Plotted LIENS 2 0.001 0 NR NR NR NR 0
DEED 0.500 0 0 0 NR NR 0
Records of Emergency Release Reports
HMIRS 0.001 0 NR NR NR NR 0
CHMIRS 0.001 0 NR NR NR NR 0
LDS 0.001 0 NR NR NR NR 0
MCS 0.001 0 NR NR NR NR 0
SPILLS 90 0.001 0 NR NR NR NR 0
Other Ascertainable Records
RCRA NonGen / NLR 0.250 7 14 NR NR NR 21
FUDS 1.000 0 0 0 0 NR 0
DOD 1.000 0 0 0 0 NR 0
SCRD DRYCLEANERS 0.500 0 0 0 NR NR 0
US FIN ASSUR 0.001 0 NR NR NR NR 0
EPA WATCH LIST 0.001 0 NR NR NR NR 0
2020 COR ACTION 0.250 0 0 NR NR NR 0
TSCA 0.001 0 NR NR NR NR 0
TRIS 0.001 0 NR NR NR NR 0
SSTS 0.001 0 NR NR NR NR 0
ROD 1.000 0 0 0 0 NR 0
RMP 0.001 0 NR NR NR NR 0
RAATS 0.001 0 NR NR NR NR 0
PRP 0.001 0 NR NR NR NR 0
PADS 0.001 0 NR NR NR NR 0
ICIS 0.001 0 NR NR NR NR 0
FTTS 0.001 0 NR NR NR NR 0
MLTS 0.001 0 NR NR NR NR 0
COAL ASH DOE 0.001 0 NR NR NR NR 0
COAL ASH EPA 0.500 0 0 0 NR NR 0
PCB TRANSFORMER 0.001 0 NR NR NR NR 0
RADINFO 0.001 0 NR NR NR NR 0
HIST FTTS 0.001 0 NR NR NR NR 0
DOT OPS 0.001 0 NR NR NR NR 0
CONSENT 1.000 0 0 0 0 NR 0
INDIAN RESERV 1.000 0 0 0 0 NR 0
FUSRAP 1.000 0 0 0 0 NR 0
UMTRA 0.500 0 0 0 NR NR 0
LEAD SMELTERS 0.001 0 NR NR NR NR 0
US AIRS 0.001 0 NR NR NR NR 0
US MINES 0.250 0 0 NR NR NR 0
ABANDONED MINES 0.250 0 0 NR NR NR 0
MINES MRDS 0.250 0 0 NR NR NR 0
FINDS 0.001 0 NR NR NR NR 0
UXO 1.000 0 0 0 0 NR 0
DOCKET HWC 0.001 0 NR NR NR NR 0
ECHO 0.001 0 NR NR NR NR 0
FUELS PROGRAM 0.250 0 0 NR NR NR 0
PFAS NPL 0.250 0 0 NR NR NR 0
PFAS FEDERAL SITES 0.250 0 0 NR NR NR 0
TC7818767.2s Page 6

MAP FINDINGS SUMMARY
Search
Distance Target Total
Database Property (Miles) < 1/8 1/8 - 1/4 1/4 - 1/2 1/2 - 1 > 1 Plotted PFAS TRIS 0.250 0 0 NR NR NR 0
PFAS TSCA 0.250 0 0 NR NR NR 0
PFAS RCRA MANIFEST 0.250 0 0 NR NR NR 0
PFAS ATSDR 0.250 0 0 NR NR NR 0
PFAS WQP 0.250 0 0 NR NR NR 0
PFAS NPDES 0.250 0 0 NR NR NR 0
PFAS PROJECT 0.250 0 0 NR NR NR 0
PFAS ECHO 0.250 0 0 NR NR NR 0
PFAS ECHO FIRE TRAIN 0.250 0 0 NR NR NR 0
PFAS PT 139 AIRPORT 0.250 0 0 NR NR NR 0
AQUEOUS FOAM NRC 0.250 0 0 NR NR NR 0
BIOSOLIDS 0.001 0 NR NR NR NR 0
UST FINDER RELEASE 0.500 0 2 1 NR NR 3
UST FINDER 0.250 0 1 NR NR NR 1
E MANIFEST 0.250 3 8 NR NR NR 11
PFAS 0.250 0 0 NR NR NR 0
AQUEOUS FOAM 0.250 0 0 NR NR NR 0
CA BOND EXP. PLAN 1.000 0 0 0 0 NR 0
CHROME PLATING 0.500 0 0 0 NR NR 0
Cortese 0.500 0 3 1 NR NR 4
CUPA Listings 0.250 0 0 NR NR NR 0
DRYCLEANERS 0.250 0 1 NR NR NR 1
EMI 0.001 0 NR NR NR NR 0
ENF 0.001 0 NR NR NR NR 0
Financial Assurance 0.001 0 NR NR NR NR 0
ICE 0.001 0 NR NR NR NR 0
HIST CORTESE 0.500 0 1 2 NR NR 3
HWP 1.000 0 0 0 0 NR 0
HWT 0.250 0 0 NR NR NR 0
HWTS 0.001 0 NR NR NR NR 0
HAZNET 0.001 0 NR NR NR NR 0
MINES 0.250 0 0 NR NR NR 0
MWMP 0.250 0 0 NR NR NR 0
NPDES 0.001 0 NR NR NR NR 0
PEST LIC 0.001 0 NR NR NR NR 0
PROC 0.500 0 0 0 NR NR 0
Notify 65 1.000 0 0 0 0 NR 0
HAZMAT 0.250 0 0 NR NR NR 0
CONTRA COSTA SITES 0.250 8 15 NR NR NR 23
UIC 0.001 0 NR NR NR NR 0
UIC GEO 0.001 0 NR NR NR NR 0
WASTEWATER PITS 0.500 0 0 0 NR NR 0
WDS 0.001 0 NR NR NR NR 0
WIP 0.250 0 0 NR NR NR 0
MILITARY PRIV SITES 0.001 0 NR NR NR NR 0
PROJECT 0.001 0 NR NR NR NR 0
WDR 0.001 0 NR NR NR NR 0
CIWQS 0.001 0 NR NR NR NR 0
CERS 0.001 0 NR NR NR NR 0
NON-CASE INFO 0.001 0 NR NR NR NR 0
OTHER OIL GAS 0.001 0 NR NR NR NR 0
TC7818767.2s Page 7

MAP FINDINGS SUMMARY
Search
Distance Target Total
Database Property (Miles) < 1/8 1/8 - 1/4 1/4 - 1/2 1/2 - 1 > 1 Plotted PROD WATER PONDS 0.001 0 NR NR NR NR 0
SAMPLING POINT 0.001 0 NR NR NR NR 0
WELL STIM PROJ 0.001 0 NR NR NR NR 0

EDR HIGH RISK HISTORICAL RECORDS
EDR Exclusive Records
EDR MGP 1.000 0 0 0 0 NR 0
EDR Hist Auto 0.125 0 NR NR NR NR 0
EDR Hist Cleaner 0.125 0 NR NR NR NR 0

EDR RECOVERED GOVERNMENT ARCHIVES
Exclusive Recovered Govt. Archives
RGA LF 0.001 0 NR NR NR NR 0
RGA LUST 0.001 0 NR NR NR NR 0
- Totals -- 0 25 69 9 3 0 106
NOTES:

TP = Target Property
NR = Not Requested at this Search Distance
Sites may be listed in more than one database
TC7818767.2s Page 8

Map ID MAP FINDINGS
Direction
Distance EDR ID Number
Elevation Site Database(s) EPA ID Number
Violation Program: HMRRP
Violation Division: Contra Costa County Health Services Department and maintain training records for a minimum of three years. a release or threatened release of a hazardous material and document annual training for all employees in safety procedures in the event of employees and submit training record to CUPA. Ensure initial and minimum of three years. CORRECTIVE ACTION: Conduct training for all plan or failure to document and maintain training records for a hazardous material including familiarity with the emergency response procedures in the event of a release or threatened release of a to provide initial and annual training to all employees in safety Violation Notes: Returned to compliance on 04/29/2019. OBSERVATION: The business failed records for a minimum of three years.
hazardous material or failure to document and maintain training safety procedures in the event of a release or threatened release of a Violation Description: Failure to provide initial and annual training to all employees in

6.95, Section(s) 25505(a)(4)
Citation: HSC 6.95 25505(a)(4) - California Health and Safety Code, Chapter Violation Date: 11-20-2018
Site Name: Jack in the Box #4349
Site ID: 364275
Violations:

CERS Description: Chemical Storage Facilities
CERS ID: 10658170
Site ID: 364275
City,State,Zip: BRENTWOOD, CA 94513
Address: 60 TECHNOLOGY WAY
Name: JACK IN THE BOX #4349
CERS:

CERS ID: 10658170
Cupa Number: 775253
Region: CONTRA COSTA
Program/Elements: HMBP: 1K-10K LBS, 0-19 EMPLOYEES
Program Status: CONTRA COSTA SITES
Billing Status: ACTIVE, BILLABLE
Facility ID: FA0037823
City: BRENTWOOD
Address: 60 TECHNOLOGY WY
Name: JACK IN THE BOX #4349
CERS ID: 10658170
Cupa Number: 775253
Region: CONTRA COSTA
Program/Elements: HMBP: LESS THAN 1000 LBS
Program Status: CONTRA COSTA SITES
Billing Status: INACTIVE, NON-BILLABLE
Facility ID: FA0037823
City: BRENTWOOD
Address: 60 TECHNOLOGY WY
Name: JACK IN THE BOX #4349
CONTRA COSTA SITES:
97 ft.

0.018 mi.

Relative:

Higher
Actual:
68 ft.
< 1/8 BRENTWOOD, CA 94513
NE 60 TECHNOLOGY WAY CERS N/A
1 JACK IN THE BOX #4349 CONTRA COSTA SITES S118648328
TC7818767.2s Page 9