Attachment 2 - Plans and Specifications — Camarillo City Council, May 13, 2026 (part 7 of 8)

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Table 24 – Millers Canal (All Reaches) Waste Load Allocation Translations Pollutant Waste Load Allocation
Single Sample Limit (mg/L)
Numeric Action Level
(mg/L)
Dry-Weather Total
Nitrogen-N

1.1 1.1
Dry-Weather
Orthophosphate-P

0.04 0.04
Wet-Weather Total
Nitrogen-N

8.0 8.0
Wet-Weather
Orthophosphate-P

0.3 0.3
The Pajaro River Basin Nutrients TMDL assigns concentration-based waste load allocation to Responsible Dischargers for dry-weather discharges into the individual water bodies listed in Tables 15 through

24. Non-stormwater discharges are authorized in this General Permit if Order, Section IV.A terms and conditions are met to control the discharge of pollutants from the construction site. Order, Section IV.B prohibits all non-stormwater dischargers not authorized under Order, Section IV.A; therefore, all unauthorized non-stormwater dischargers must be either eliminated or have regulatory coverage under a separate NPDES permit. Authorized non-stormwater dischargers, as defined in this General Permit, are authorized because these discharges do not commingle with stormwater associated with construction activity. The Regional Water Board may impose additional requirements on nonstormwater dischargers if deemed necessary per site-specific analysis.

This General Permit requires that Responsible Dischargers meet the assigned wet-weather waste load allocations as numeric action levels at the construction site’s discharge locations, rather than the applicable receiving waters as stated in the Pajaro River Basin Nutrients TMDL.

The decision to establish numeric action levels, instead of numeric effluent limitations, was made considering that construction stormwater discharges are not expected to contribute a significant load of nutrients to receiving waters. An exceedance of the waste load allocation in the receiving waters would likely be attributed to sources other than construction stormwater discharges. Since different sources of stormwater runoff are often comingled, it is difficult to identify where the nutrient loading originates. Monitoring at the discharge location would be more indicative of an exceedance of the nutrient-related water quality objectives that is associated with a specific construction site.

Furthermore, compliance monitoring at the receiving waters can be infeasible or impractical as Responsible Dischargers may have restricted access to or be far-removed from the compliance points.

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· Compliance Actions and Schedule
At the time the Pajaro River Basin Nutrient TMDL was written, NPDES stormwater-permitted construction sites were generally expected to be meeting the proposed waste load allocations through the requirements of the previous permit or any subsequent Construction General Permit.

However, available information did not conclusively demonstrate that all construction sites were meeting the waste load allocations. 159 Therefore,
in addition to complying with the requirements of this General Permit, Responsible Dischargers identifying on-site sources of ammonia, nitrate, total phosphorus, or total nitrogen shall compare all non-visible sampling and analytical results to the numeric action levels for the identified nutrients.

If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the numeric action levels in the future. Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to nutrient sources, are expected to meet the numeric action levels. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the numeric action levels.

The Pajaro River Basin Nutrient TMDL’s implementation schedule indicates that the waste load allocations are to be achieved within 25 years of the TMDL’s effective date July 12, 2016. Therefore, the TMDL’s compliance deadline is July 12, 2041. Since the compliance deadline is in the far future, compliance with this General Permit is considered compliance with the TMDL. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance by July 12, 2041.
ii. Los Angeles Area Lakes Nutrients TMDL160
The U.S. EPA adopted the Los Angeles Area Lakes TMDL on March 26, 2012, to address the impairment of Peck Road Park Lake, Echo Park, Legg 159 Pajaro River Basin TMDL, p. 21.
160 United States EPA Region IX, Los Angeles Area Lakes Total Maximum Daily Loads for Nitrogen, Phosphorus, Mercury, Trash, Organochlorine Pesticides and PCBs (March 26, 2012),

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Lakes, and Puddingstone Reservoir due to nitrogen and phosphorus. Peck Road Park Lake, Echo Park Lake, and Legg Lakes are located in the Los Angeles River watershed and Puddingstone Reservoir is located in the San Gabriel River watershed.
· Source Analysis
Nutrient loadings into Peck Road Park Lake, Echo Park, Legg Lakes, and Puddingstone Reservoir originate from a variety of sources, including discharges from storm drain outlets containing construction stormwater discharges from sites within the watershed.
· Waste Load Allocation Translation
The Los Angeles Area Lakes TMDL assigns concentration-based waste load allocations for nitrogen and phosphorus to Responsible Dischargers at the site’s discharge location(s) for construction stormwater discharges into Peck Road Park Lake, Echo Park, Legg Lakes, and Puddingstone Reservoir. Therefore, dischargers covered under this General Permit are considered Responsible Dischargers for this TMDL. The waste load allocations for nitrogen and phosphorus differ depending on the receiving waters. The waste load allocations assigned to Responsible Dischargers for nitrogen and phosphorus are translated as shown in Table 25 and Table 26 below. The waste load allocations were set at monthly averages. The TMDL also states that “[a] three-year average will be used to evaluate compliance.” Because of the variable nature of stormwater, monthly or yearly averages are not necessarily representative of pollutant loading, and the nitrogen waste load allocation was translated into a numeric action level.

In addition to the explanation set forth in Section I.G.5.d of this Fact Sheet, implementation of the TMDL through numeric action levels is consistent with the assumptions and requirements of the waste load allocations because it is expected that compliance with this Permit will prevent exceedances of the numeric action levels. This TMDL was developed by U.S. EPA, and the Regional Board has not yet adopted an implementation plan. The TMDL also states, “if applicable water quality criteria for ammonia, dissolved oxygen and pH, and the chlorophyll-α target are met in the lake, then the total phosphorus and total nitrogen allocations are considered attained.” Because an individual discharger <https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/Established /Lakes/LALakesTMDLsEntireDocument.pdf> [as of May 20, 2021] (Los Angeles Area Lakes Nutrients TMDL)

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cannot determine whether the applicable water quality criteria were being met at the time of their discharge, the waste load allocation is more appropriately translated into an action level. As further explained in Section I.G.5.d of this Fact Sheet, dischargers must take corrective actions in response to any numeric action level exceedance and this iterative process will protect water quality consistent with the requirements and assumptions set forth in this TMDL.

Table 25 – Total Nitrogen Waste Load Allocation Translation Water Body Waste Load Allocation Monthly
Average (mg/L)
Numeric Action Level
(mg/L)
Peck Road Park Lake 3.61 3.61
Echo Park Lake 1.33 1.33
Legg Lakes 1.8 1.8
Puddingstone
Reservoir 2.0 2.0
Table 26 – Total Phosphorus Waste Load Allocation Translation Pollutant Waste Load Allocation Monthly
Average (mg/L)
Numeric Effluent
Limitation (mg/L)
Peck Road Park Lake 0.37 0.37
Echo Park Lake 0.16 0.16
Legg Lakes 0.64 0.64
Puddingstone
Reservoir 0.4 0.4
This General Permit requires that Responsible Dischargers meet the assigned waste load allocations at the construction site’s discharge location(s), which is consistent with requirements and assumptions of the TMDL.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of phosphorus and nitrogen shall compare all non-visible sampling and analytical results to the numeric action levels or numeric effluent limitations for the identified nutrients. If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the numeric action levels or numeric effluent limitations in the future. Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to nutrient sources, are expected to meet the numeric action levels or numeric effluent

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limitations. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the numeric action levels or numeric effluent limitations.

The Los Angeles Regional Water Quality Control Board has not adopted an Implementation Plan or a compliance schedule for the Los Angeles Area Lakes TMDL. The numeric action levels and numeric effluent limitations described above are applicable upon the effective date of this General Permit.
iii. Los Angeles River Nutrients TMDL161
The Los Angeles Regional Water Quality Control Board adopted the Los Angeles River Nutrients TMDL on December 6, 2012, to address impairment of the Los Angeles River due to nitrogen compounds (ammonia, nitrite, and nitrate) and related effects (algae, pH, odor, and scum). · Source Analysis
The TMDL lists urban runoff as a point source which includes stormwater runoff from construction sites and other urban runoff sources such as industrial, municipal, and the California Department of Transportation.162
· Waste Load Allocation Translation
The Los Angeles River Nutrients TMDL assigns concentration-based waste load allocations for nitrogen compounds to minor point sources, including construction stormwater runoff. Therefore, construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for this TMDL. The waste load allocations for ammonia are given as one-hour averages and thirty-day averages, for discharges into the Los Angeles River above LA-Glendale Water Reclamation Plant, Los Angeles River below LA-Glendale Water Reclamation Plant, or to tributaries discharging into the Los Angeles River above or below the LA-Glendale Water Reclamation Plant.

Because stormwater is an intermittent discharge, only the acute onehour averages are appropriate to apply to Responsible Dischargers. The waste load allocation translations from one-hour averages to numeric 161 Los Angeles Regional Water Quality Control Board, Los Angeles River Nitrogen Compounds and Related Effects TMDL (July 10, 2003),
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/R12- 010_RB_BPA.pdf> [as of May 20, 2021] (Los Angeles River Nutrients TMDL) 162 Los Angeles River Nutrients TMDL, p. 5.

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action levels for the three different reaches of the Los Angeles River are shown in Tables 27 through 29 below. The one-hour averages are appropriate to translate into action levels because of the variable nature of stormwater, and when the non-visible sampling requirements are triggered, the effluent sampling results are not averaged.

The Los Angeles River Nutrients TMDL assigns concentration-based waste load allocations for nitrate-nitrogen, nitrite-nitrogen, and nitratenitrogen plus nitrite-nitrogen as thirty-day averages to Responsible Dischargers into all reaches and tributaries of the Los Angeles River.

The waste load allocations are translated to numeric action levels as shown in Table 30 below, since compliance with monthly averages is not appropriate to monitor stormwater due to its intermittent and variable nature.

The May 2021 draft of the Construction Stormwater General Permit reissuance proposed a translation of the ammonia, nitrate-nitrogen, nitrite-nitrogen, and nitrate-nitrogen plus nitrite-nitrogen waste load allocations into numeric effluent limitations as the waste load allocations were concentration-based and assigned at the point of discharge.

However, the Permit was revised to implement nitrogen-based nutrient waste load allocations as numeric action levels because numeric action levels are consistent with the assumptions and requirements of the waste load allocations.

Implementation of the TMDL through numeric action levels is consistent with the assumptions and requirements of the waste load allocation because it is expected that compliance with this Permit will prevent exceedances of the waste load allocations. Consistent with the explanation set forth in Section I.G.5.d of this Fact Sheet, the critical condition identified in the TMDL is low flow conditions (p.8). The TMDL also indicates that a majority of nutrient loading originates from major point sources such as water reclamation plants and other publicly owned treatment works,163 while sources in stormwater runoff requires further evaluation.
163 For example, the principal source of nitrogen compounds identified in this TMDL are the water reclamation plants, which contribute 84.1 percent of the total dry weather nitrogen load (p.3). The TMDL states that stormwater may also contribute nitrate loads and that further evaluation of these sources is set forth in the implementation plan, but the implementation plan does not provide further detail about stormwater as a source.

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Table 27 – Los Angeles River above LA-Glendale WRP Waste Load Allocation Translation
Pollutant Waste Load Allocation OneHour Average (mg/L) Numeric Action Level
(mg/L)
Ammonia 4.7 4.7
Table 28 – Los Angeles River below LA-Glendale WRP Waste Load Allocation Translation
Pollutant Waste Load Allocation OneHour Average (mg/L) Numeric Action Level
(mg/L)
Ammonia 8.7 8.7
Table 29 – Los Angeles River Tributaries Waste Load Allocation Translation Pollutant Waste Load Allocation OneHour Average (mg/L) Numeric Action Level
(mg/L)
Ammonia 10.1 10.1
Table 30 – Los Angeles River Tributaries Waste Load Allocation Translation Pollutant Translated Numeric Action Level (mg/L)
Nitrate-Nitrogen 8.0
Nitrite-Nitrogen 1.0
Nitrate plus Nitrite-Nitrogen 8.0
This General Permit requires that Responsible Dischargers meet the numeric action levels at the construction site’s discharge location(s), which is consistent with requirements and assumptions of the Los Angeles River Nutrients TMDL.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of ammonia, nitrate, or nitrite shall compare all non-visible sampling and analytical results to the numeric action levels for the identified nutrients.

If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the numeric action levels in the future. Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to nitrogen compound sources, are expected to meet the assigned numeric action levels. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the numeric action levels.

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The Los Angeles River Nutrients TMDL’s final compliance deadline for the waste load allocations was March 23, 2004. Since this compliance deadline has already passed, the numeric action levels are applicable upon the effective date of this General Permit.
iv. Machado Lake Nutrients TMDL164
The Los Angeles Regional Water Quality Control Board adopted the Machado Lake Nutrients TMDL on May 1, 2008, to address the impairment of Machado Lake due to eutrophication, algae, ammonia, and odors caused by an excess of nutrient loadings. These pollutants can have negative impacts on the beneficial uses of Machado Lake including recreation (REC1 and REC-2), aquatic wildlife (WARM, WILD, RARE, and WET) and water supply (MUN).
· Source Analysis
Stormwater discharges from the municipal separate storm sewer system (MS4), California Department of Transportation, and general construction and industrial discharges are identified has point sources of nutrients into Machado Lake.
· Waste Load Allocation Translation
The Machado Lake Nutrients TMDL assigns waste load allocations as concentration-based monthly averages to construction stormwater dischargers for total phosphorus and total nitrogen based on in-lake concentrations. Therefore, dischargers covered under this General Permit are considered Responsible Dischargers for this TMDL. The waste load allocations apply to discharges to Machado Lake or through the following subdrainage systems: Drain 553, Wilmington Drain, Project 77/510, and Walteria Lake. The waste load allocations are translated to numeric action levels, as shown in Table 31 below, because this TMDL assigned these waste load allocations in the receiving water (in-lake) instead of at the point of discharge from the construction site. This TMDL assigned the waste load allocations as monthly averages; however, precipitation events are intermittent and variable. Compliance with the waste load allocations based on monthly averages is inconsistent with the monitoring and reporting requirements in this General Permit. 164 Los Angeles Regional Water Quality Board, Total Maximum Daily Load for Eutrophic, Algae, Ammonia, and Odors (Nutrient) in Machado Lake (May 1, 2008), <https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/2008- 006_RB_BPA.pdf> [as of May 20, 2021] (Machado Lake Nutrients TMDL)

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Table 31 – Machado Lake Nutrient Waste Load Allocations Translation Pollutant Waste Load Allocation Monthly
Average (mg/L)
Numeric Action Level
(mg/L)
Total Phosphorus 0.1 0.1
Total Nitrogen 1.0 1.0
This General Permit requires Responsible Dischargers to meet the numeric action levels at the construction site’s discharge location(s), which is consistent with requirements and assumptions of the TMDL. · Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of phosphorus and nitrogen shall compare all non-visible sampling and analytical results to the numeric action levels for the identified nutrients.

The Machado Lake Nutrients TMDL’s effective date was March 11, 2009, with a final compliance deadline set for September 11, 2018.

Since the compliance deadline for this TMDL has passed, the discharger shall comply with the numeric action levels by the effective date of this General Permit.
v. Santa Clara River Nitrogen Compounds TMDL165
The Los Angeles Regional Water Quality Control Board adopted the Santa Clara River Nitrogen Compounds TMDL on August 7, 2003, to address nutrient-related impairment of Santa Clara River Reach 3 and Reach 7. In specific, biostimulatory substances such as ammonia, nitrate, and nitrite can lead to excessive algae growth and low dissolved oxygen in the receiving water body.
165 Los Angeles Regional Water Quality Control Board, Santa Clara River Nitrogen Compounds TMDL (August 7, 2003),
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/2003- 011_RB_BPA.pdf> [as of April 28, 2022]

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· Source Analysis
The primary sources of these nitrogen compounds in the Santa Clara River can be attributed to local water reclamation and treatment plants.

However, stormwater discharges were also identified as potential point sources of the nitrogen compounds.
· Waste Load Allocation Translation
The Santa Clara River Nitrogen Compounds TMDL assigns
concentration-based waste load allocations for ammonia and nitrate plus nitrite as nitrogen to construction stormwater sources regulated under NPDES permits. Therefore, construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for this TMDL.

Ammonia and nitrate plus nitrite as nitrogen waste load allocations are established to address both acute effects (one-hour average concentration) and chronic effects (30-day average concentration) on aquatic life. Because stormwater is an intermittent discharge, only the acute one-hour average waste load allocations for ammonia are appropriate to apply to Responsible Dischargers. The translation of onehour average waste load allocations to numeric action levels for the two reaches of the Santa Clara River are shown in Table 32 and Table 33 below. The one-hour average waste load allocations appropriately translate into numeric action levels due to the variable nature of stormwater. Nitrate plus nitrite as nitrogen waste load allocations were not translated as they were only established as 30-day averages.

Table 32 – Santa Clara River Reach 3 Ammonia as Nitrogen Waste Load Allocation Translation
Pollutant Waste Load Allocation OneHour Average (mg/L) Numeric Action Level
(mg/L)
Ammonia 4.2 4.2
Table 33 – Santa Clara River Reach 7 Ammonia as Nitrogen Waste Load Allocation Translation
Pollutant Waste Load Allocation OneHour Average (mg/L) Numeric Action Level
(mg/L)
Ammonia 5.2 5.2
This General Permit requires that Responsible Dischargers comply with the numeric action levels at the construction site discharge location(s), consistent with requirements and assumptions of the TMDL.

The May 2021 draft of the Construction Stormwater General Permit reissuance proposed a translation for the ammonia waste load

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allocations into numeric effluent limitations as the waste load allocations were concentration-based and assigned at the point of discharge.

As set forth in Section I.G.5.d of this Fact Sheet, the source analysis found that the principal source of ammonia, nitrite, and nitrate to the Santa Clara River is discharges from water reclamation plants and publicly owned public treatment works (BPA, p.2). The TMDL also acknowledged that stormwater discharge may contribute nitrate loads.

But the allocations were set at the water quality objectives for receiving waters. The most critical conditions for water quality in the Santa Clara River are low-flow conditions, in particular at the end of the dry season (p. 72).

The TMDL also noted that “mass emission monitoring data conducted for MS4 NPDES Permit compliance indicate that the MS4 discharges are below the waste load allocation in both wet and dry weather samples.”166 (p.62) CGP dischargers subject to this TMDL are located within a MS4. · Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of ammonia, nitrate, and nitrite shall compare all non-visible sampling and analytical results to the numeric action levels for the identified nutrients.

If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the numeric action levels in the future. Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to nitrogen compound sources, are expected to meet the numeric action levels. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the numeric action levels.

The Santa Clara River Nitrogen Compounds TMDL’s compliance deadline for the waste load allocations was March 23, 2004. Since this 166 Staff Report, p. 62, available at
https://www.waterboards.ca.gov/losangeles/board_decisions/basin_plan_amendment s/technical documents/2003-011/03 0523/StaffReport06-16.pdf.

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compliance deadline has passed, the numeric effluent limitations are applicable upon the effective date of this General Permit. vi. Ventura River Algae TMDL167
The Los Angeles Regional Water Quality Control Board adopted the Ventura River Algae TMDL on December 6, 2016, to address nutrientrelated impairments in the Ventura River and its tributaries. Nutrient-related listings negatively impact beneficial uses such as water contact recreation, non-water contact recreation, warm and cold freshwater habitat, wetland habitat, rare/threated/endangered species habitat, migration of aquatic organisms, and spawning.
· Source Analysis
Discharges conveyed via the municipal separate storm sewer (MS4), including stormwater and non-stormwater discharges, are estimated to contribute 21.3 percent of nutrient loading in dry weather and 28.3 percent in wet weather.
· Waste Load Allocation Translation
The Ventura River Algae TMDL assigns concentration-based waste load allocations for nitrogen and phosphorus to construction stormwater dischargers during dry and wet-weather discharges. Therefore, construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for this TMDL. No translation is necessary for the dry and wet-weather waste load allocations as they were already expressed as concentration-based limitations. 1) Dry-Weather Waste Load Allocations
The Ventura River Algae TMDL assigns concentration-based waste load allocations for dry-weather total nitrogen and total phosphorus, shown in Table 34 below, with compliance assessed by averaging two grab samples.

Discharges that occur during dry-weather conditions are referred to as non-stormwater and only are authorized in this General Permit if the conditions in Order Section IV.A are met to control the discharge of pollutants from the construction site. Authorized non-stormwater discharges, as defined in this General Permit, are authorized 167 Los Angeles Regional Water Quality Control Board, Total Maximum Daily Load for Algae, Eutrophic Conditions, and Nutrients in the Ventura River and its Tributaries (December 6, 2012)
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/R12- 011_RB_BPA.pdf> [as of April 28, 2022] (BPA)

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because these discharges do not commingle with stormwater associated with construction activity. Order Section IV.B prohibits all NSWDs not authorized under Section IV.A; therefore, all unauthorized NSWDs must be either eliminated or have regulatory coverage under a separate NPDES permit. A dry-weather discharge to the Ventura River watershed with concentrations greater than the total nitrogen and total phosphorus waste load allocations would therefore be prohibited. The Regional Water Board may impose additional requirements on NSWDs if deemed necessary per sitespecific analysis.

Table 34 – Ventura River Algae Dry-Weather Waste Load Allocations Pollutant Total Nitrogen Waste Load
Allocation (mg/L)
Total Phosphorus
Waste Load Allocation
(mg/L)
Dry weather 1.15 0.115
2) Wet-Weather Waste Load Allocations
The wet-weather waste load allocations for nitrate plus nitrite as nitrogen, or total nitrogen where indicated, in Table 35 below are expressed as event mean concentrations or the average
concentration for all samples taken per precipitation event resulting in discharge.

Table 35 – Ventura River Algae Wet-Weather Waste Load Allocations Reach Nitrate Plus Nitrate as Nitrogen Numeric
Action Levels (mg/L)
Estuary *
Reach 1 *
Reach 2 10
Cañada Larga 10
Reach 3 5
San Antonio Creek 5
Reach 4 5
Reach 5 5
* The waste load allocations for the Estuary and Reach 1 are for total nitrogen at a concentration of 7.4 mg/L
The May 2021 draft of the Construction Stormwater General Permit reissuance proposed a translation for nitrate-nitrogen plus nitritenitrogen and total nitrogen waste load allocations into numeric effluent limitations as the waste load allocations were concentrationbased and assigned at the point of discharge. However, the Permit was revised to implement nitrogen-based nutrient waste load

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allocations as numeric action levels because numeric action levels are consistent with the assumptions and requirements of the waste load allocations.

The TMDL states that, “[t]he discharges from the general NPDES permits are intermittent and considered negligible for the purposes of this source assessment.” (Staff Report, p.40)168 Accordingly, “[t]he loadings from the general NPDES permits [were] not quantified” in the source assessment. (Staff Report, p.40) According to the TMDL, the critical condition for the TMDL is dry weather, “and it is the dryweather loading that results in water quality impairments.” (BPA, p.5) “The watershed nutrient wet-weather loads are generally delivered directly to the ocean and thus do not contribute to exceedance of the biostimulatory substances…”) (BPA, p.8) “Based on the linkage analysis, wet-weather loads do not have a significant impact on receiving water quality in the Ventura River and its tributaries or the Estuary and biostimulatory objectives are attained.” (Staff Report, p.79) The TMDL acknowledged that maintaining existing discharge quality would ensure that no further loading would occur in the receiving water. (BPA, p.8) The wet-weather loads were set to attain site-specific water quality objectives, (Staff Report, p.79) but “[f]or Reach 1 and Estuary, Wet-weather waste load allocations for stormwater sources are equal to existing water quality in stormwater discharges.” (BPA, p.6) This suggests that the TMDL assumed that reductions in stormwater discharges were not necessary. Dryweather waste load allocations were set at in-stream nutrient concentrations to meet biomass numeric targets. (Staff Report, p.76) All these statements support implementation of the TMDL through numeric action levels.

Although the implementation language specifies that the TMDL should be implemented as numeric water quality-based effluent limitations, the underlying assumptions contained in the TMDL support implementation via numeric action levels.
168 Los Angeles Regional Water Quality Control Board, Algae, Eutrophic Conditions, and Nutrients Total Maximum Daily Loads for Ventura River and Its Tributaries (December 6, 2012)
<https://www.waterboards.ca.gov/losangeles/board_decisions/basin_plan_amendmen ts/technical_documents/73_New/Docs/Mar%202013/Staff%20report_Final%20120612 .pdf> [as of June 28, 2022] (Staff Report)

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· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of nitrogen and/or phosphorus shall compare all non-visible sampling and analytical results to the numeric action level for the identified nutrients, when a wet-weather discharge occurs. If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the numeric action levels the future.

Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to nitrogen and phosphorous sources, are expected to meet the assigned numeric action levels. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the numeric action levels.

The Ventura River Algae TMDL’s compliance deadline for the waste load allocations was June 28, 2013. Since the compliance deadline has passed, the numeric action levels are applicable upon the effective date of this General Permit.
vii. San Diego Creek and Newport Bay Watershed Nutrients TMDL169 The Santa Ana Regional Water Quality Control Board adopted the San Diego Creek and Newport Bay Watershed Nutrients TMDL in 1998 to address nutrient-related impairments in Newport Bay, San Diego Creek, and its tributaries. Nutrients contribute to seasonal algal blooms that negatively impact recreational, aesthetic, and wildlife habit beneficial uses in these waters.
· Source Analysis
The predominant source of nutrients are the tailwaters from agricultural crops and from commercial nurseries, however, runoff from construction sites can also contribute to nutrient loading through the erosion of sediment containing phosphorus.
169 Santa Ana Regional Water Quality Control Board, Nutrient TMDL for the Newport Bay/San Diego Creek Watershed (1998)
<https://www.waterboards.ca.gov/santaana/water_issues/programs/tmdl/> [as of May 20, 2021] (San Diego Creek and Newport Bay Watershed Nutrients TMDL)

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· Waste Load Allocation Translation
Construction stormwater dischargers are assigned an annual, massbased waste load allocation for total phosphorus, aiming to reduce the loading of phosphorus by 50 percent. Therefore, construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for this TMDL if they identify sources of phosphorus on their site via the required pollutant source assessment.

All construction sites were expected to achieve compliance with the annual waste allocation of 12,810 lbs/year total phosphorus by 2007.

Requiring Responsible Dischargers to directly implement the waste load allocation and sample for the pollutants(s) would be impractical, costly, and not aligned with the requirements of this General Permit. It is infeasible to translate a mass-based annual waste load allocation applicable to all construction stormwater discharges to an effluent limitation that is applicable to an individual site. As mentioned in the source analysis, phosphorus loadings from construction stormwater discharges are in particulate form and associated with wet weather.

Therefore, the following will address this TMDL:
1) Comply with the site-specific erosion and sediment control, and postconstruction requirements in this General Permit. 2) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as preconstruction (e.g., undisturbed vegetation for the area) conditions.

Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of phosphorus through the required pollutant source assessment are to implement BMPs specific to preventing or controlling stormwater exposure to the sources of phosphorus. Furthermore, Responsible Dischargers are to comply with the RUSLE2 modeling requirements in Attachment H, Section I.D.2. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations.

The San Diego Creek and Newport Bay Watershed Nutrients TMDL has waste load allocation compliance deadline set in 2007 for construction sites. Since this compliance deadline has passed, the compliance

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ORDER WQ 2022-0057-DWQ
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FACT SHEET FS-156
actions are applicable to the Responsible Dischargers upon the effective date of this General Permit.
e. Sediment TMDLs
Twenty-five (25) sediment TMDLs are translated for this General Permit.

Sediment is the loose sand, clay, silt, and other soil particles that settle at the bottom of a body of water. Sediment can be detrimental to aquatic life by interfering with photosynthesis, respiration, growth, reproduction, and oxygen exchange in water bodies.170 Sediment can be transported in construction site discharges due to excessive erosion.171 At construction sites, the rate of erosion is increased due to increased amount of exposed and disturbed soil.

Therefore, construction sites that discharge into the watersheds of these water bodies are considered Responsible Dischargers and shall comply with the requirements set forth in these TMDLs.
i. Albion River Sediment TMDL172
The United States Environmental Protection Agency (U.S. EPA) established the Albion River Sediment TMDL on December 20, 2001, to address the impairment on the Albion River and its tributaries due to sediment.

The implementation requirements for the Albion River Sediment TMDL in this General Permit are based on the North Coast Sediment TMDL Implementation Policy173 adopted on November 29, 2004. The North Coast Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sedimentrelated standards by all dischargers of sediment waste.174 Construction 170 California Stormwater Quality Association, Construction Stormwater Best Management Practice Handbook (August 2011), <http://www.casqa.org/> [as of May 20, 2021] (CASQA Construction BMP Handbook)
171 CASQA Construction BMP Handbook, p. 1-7.
172 United States Environmental Protection Agency Region IX, Albion River Sediment TMDL for Sediment (December 2001),
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/albion_rive r/pdf/albionfinaltmdl.pdf> [as of May 20, 2021] (Albion River Sediment TMDL) 173 North Coast Regional Water Quality Control Board, Total Maximum Daily Load Implementation Policy Statement for Sediment-Impaired Receiving Waters in the North Coast Region (November 29, 2004).
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/sediment_t mdl_implementation/> [as of May 20, 2021] (North Coast Sediment TMDL Implementation Policy)
174 North Coast Sediment TMDL Implementation Policy, p. 3.

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FACT SHEET FS-157
stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Albion River Sediment TMDL. · Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources at zero (0) because there are no significant point sources of sediment in the Albion River watershed.175
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Quality Control Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit.
ii. Big River Sediment TMDL176
The U.S. EPA established the Big River Sediment TMDL on December 20, 2001, to address the impairment of Big River Sediment TMDL and its tributaries due to sediment.

The implementation requirements for the Big River Sediment TMDL in this General Permit are based on the North Coast Sediment TMDL Implementation Policy adopted on November 29, 2004. The Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.177 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Big River Sediment TMDL.
175 Albion River Sediment TMDL, p. 35.
176 United States Environmental Protection Agency Region IX, Big River Total Maximum Daily Load for Sediment (December 2001)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/big_river/p df/bigfinaltmdl.pdf> [as of May 20, 2021] (Big River Sediment TMDL) 177 North Coast Sediment TMDL Implementation Policy, p. 3.

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ORDER WQ 2022-0057-DWQ
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FACT SHEET FS-158
· Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources at zero (0) because there are no significant point sources of sediment in the Big River Sediment TMDL watershed.178
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit.
iii. Eel River – Lower Main Sediment TMDL179
The U.S. EPA established the Eel River – Lower Main Sediment TMDL on December 18, 2007, to address the impairment of the Lower Eel River and its tributaries due to sediment.

The implementation requirements for the Eel River – Lower Main Sediment TMDL in this General Permit are based on the North Coast Sediment TMDL Implementation Policy180 adopted on November 29, 2004. The North Coast Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sedimentrelated standards by all dischargers of sediment waste.181 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Eel River – Lower TMDL. 178 Big River Sediment TMDL, p. 36.
179 United States Environmental Protection Agency Region IX, Lower Eel River Total Maximum Daily Loads for Temperature and Sediment (December 18, 2007) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_l ower/pdf/LER-TMDL-final-121807-signed.pdf> [as April 28, 2022] (Eel River-Lower Main Sediment TMDL)
180 North Coast Regional Water Quality Control Board, Total Maximum Daily Load Implementation Policy Statement for Sediment-Impaired Receiving Waters in the North Coast Region (November 29, 2004)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/sediment_t mdl_implementation/> [as of May 20, 2021] (North Coast Sediment TMDL Implementation Policy)
181 North Coast Sediment TMDL Implementation Policy, p. 3.

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ORDER WQ 2022-0057-DWQ
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FACT SHEET FS-159
· Waste Load Allocation Translation
The source analysis supporting the allocations in Table 36 evaluated sediment loading at a subwatershed scale. The source analysis did not attempt to distinguish sediment loading at the scale of specific land ownerships nor did the analysis distinguish loading between land areas subject to NPDES regulation, or land areas not subject to NPDES regulation. Therefore, this TMDL includes separate but identical load allocations for non-point sources and waste load allocations for diffuse NPDES-permitted sources for each subarea. The diffuse NPDESpermitted pollutant sources are addressed in the statewide NPDES municipal stormwater permit for the California Department of Transportation, this statewide Construction Stormwater General Permit, the statewide Industrial Stormwater General Permit, and the City of Fortuna NPDES municipal stormwater permit.182
Table 36 – Sediment Load Allocations for the Lower Eel River Watershed and its Tributaries
Sediment Source Load Allocation
(tons/mi2/year)
1955-2003 Loading
(tons/mi2/year)
Percent
Reduction
Road (Episodic) 9 43 80 percent
Road (Chronic) 17 115 85 percent
Bank Erosion 6 21 70 percent
Construction sites covered by this General Permit are considered to be human related sources of sediment to the watershed and therefore, Responsible Dischargers. Responsible Dischargers are not to exceed the load allocations assigned to roads (episodic and chronic) and bank erosion, as the allocations assigned to timber harvest and skid trails do not typically apply to construction sites. Responsible Dischargers calculate their annual loading by multiplying the area of the site with these load allocations.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-160
iv. Eel River – Middle Fork Sediment TMDL183
The U.S. EPA established the Eel River – Middle Fork Sediment TMDL in December 2003 to address the impairment of the Middle Fork Eel River and tributaries due to sediment.

The implementation requirements for the Eel River – Middle Fork Sediment TMDL in this General Permit are based on the North Coast Sediment TMDL Implementation Policy adopted on November 29, 2004. The North Coast Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sedimentrelated standards by all dischargers of sediment waste.184 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Eel River – Middle Fork Sediment TMDL. · Waste Load Allocation Translation
This TMDL identified discharges under the Construction General Permit and Caltrans Statewide Permit as current and prospective point sources that may discharge sediment in the watershed. Discharges from these point sources cannot be readily determined and possible loading from these sources is not distinguished from general management-related loading in the source analysis. Therefore, this TMDL set the load allocations for nonpoint sources to also represent waste load allocations for point sources that would be covered by general NPDES permits.185 Table 37 – Sediment Load Allocations for the Middle Fork Eel River Watershed and its Tributaries (tons/mi2/yr)
Sediment Source Black
Butte
Elk
Creek
Round
Valley
Upper
Middle
Fork
Williams/
Thatcher
Basinwide
Load
Small Management
Sources 7 41 9 9 19 23
Percent Reduction 0
percent
32 percent
95 percent
0 percent
89 percent
70 percent
183 United States Environmental Protection Agency Region IX, Final Middle Fork Eel River Total Maximum Daily Loads for Temperature and Sediment (December 2003) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_ middle_fork/pdf/tmdl.pdf> [as of April 28, 2022] (Eel River – Middle Fork Sediment TMDL)
184 North Coast Sediment TMDL Implementation Policy.
185 Eel River – Middle Fork Sediment TMDL, p. 45.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-161
The construction sites covered by this General Permit are considered to be human related sources of sediment to the watershed. Responsible Dischargers are not to exceed the load allocations or reductions assigned to “small management sources.” These allocations vary by subwatershed, as noted in Table 37 above. Responsible Dischargers calculate their annual loading by multiplying the area of the site with the appropriate load allocation.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. v. Eel River – Middle Main Sediment TMDL186
The U.S. EPA established the Eel River – Middle Main Sediment TMDL on December 31, 2005, to address the impairment of the Middle Main Eel River (from Dos Rios to the South Fork Eel River) and its tributaries due to sediment. A portion of the watershed is part of the Round Valley Indian Country. This TMDL does not apply to lands under tribal jurisdiction.

The implementation requirements for the Eel River – Middle Main Sediment TMDL in this General Permit are based on the North Coast Sediment TMDL Implementation Policy adopted on November 29, 2004. The Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.187 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Eel River – Middle Main Sediment TMDL.
186 United States Environmental Protection Agency Region IX, Final Middle Main Eel River and Tributaries Total Maximum Daily Loads for Temperature and Sediment (December 31, 2005)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_ middle_main/pdf/mainmdl-eel-final.pdf> [as of April 28, 2022] (Eel River – Middle Main Sediment TMDL)
187 North Coast Sediment TMDL Implementation Policy.

Page 706 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-162
· Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources at zero (0) for construction sites because this source is not significant.188 · Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. vi. Eel River – North Fork Sediment TMDL189
The U.S. EPA established the Eel River – North Fork Sediment TMDL on December 30, 2002, to address the impairment of the North Fork Eel River and its tributaries due to sediment. These TMDLs do not apply to lands under tribal jurisdiction.

The implementation requirements for the Eel River – North Fork Sediment TMDL in this General Permit are based on the North Coast Sediment TMDL Implementation Policy adopted on November 29, 2004. The North Coast Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sedimentrelated standards by all dischargers of sediment waste.190 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Eel River – North Fork Sediment TMDL. · Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources at zero (0) because there are no significant point sources of sediment in the North Fork Eel River watershed.191
188 Eel River – Middle Main Sediment TMDL, p. 45.
189 United States Environmental Protection Agency Region IX, Final North Fork Eel River Total Maximum Daily Loads for Sediment and Temperature (December 30, 2002) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_n orth_fork/pdf/final.pdf> [as of April 28, 2022] (Eel River – North Fork Sediment TMDL) 190 North Coast Sediment TMDL Implementation Policy.
191 Eel River – North Fork Sediment TMDL, p. 23.

Page 707 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-163
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. vii. Eel River – Upper Main Sediment TMDL192
The U.S. EPA established the Eel River – Upper Main Sediment TMDL on December 29, 2004, to address the Impairment of the Upper Main Eel River (including Tomki Creek, Outlet Creek, and Lake Pillsbury) and its tributaries due to sediment.

The implementation requirements for the Eel River – Upper Main Sediment TMDL in this General Permit are based on the North Coast TMDL Implementation Policy adopted on November 29, 2004. The North Coast Sediment Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.193 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Eel River – Upper Main Sediment TMDL.
· Waste Load Allocation Translation
This TMDL identified discharges under the Construction General Permit and Caltrans Statewide Permit as current and prospective point sources that may discharge sediment in the watershed and are therefore Responsible Dischargers. Discharges from these point sources cannot be readily determined and possible loading from these sources is not distinguished from general management-related loading in the source analysis. Therefore, this TMDL set the load allocations for nonpoint 192 United States Environmental Protection Agency Region IX, Final Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment (December 29, 2004) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_u pper_main/pdf/uer-tmdl-final-12-28.pdf> [as of May 20, 2021] (Eel River – Upper Main Sediment TMDL)
193 North Coast Sediment TMDL Implementation Policy.

Page 708 of 978 ends

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FACT SHEET FS-164
sources to also represent waste load allocations for point sources that would be covered by general NPDES permits.194
Table 38 – Sediment Load Allocations for the Upper Main Eel River Watershed and its Tributaries
Sediment Source Load Allocation
(tons/mi2/year)
1940-2004 Loading
(tons/mi2/year)
Percent
Reduction
Large Features (>3,000 yds3) 36 71 49 percent
Road Related (Small Features) 14 28 50 percent
Construction sites covered by this General Permit are considered to be human (land management) related sources of sediment to the watershed. Responsible Dischargers are not to exceed the load allocations assigned to road related projects or “large features” as this General Permit regulates projects that disturb an acre or greater of land.

Responsible Dischargers calculate their annual loading by multiplying the area of the site with these load allocations.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. viii. Eel River – South Fork Sediment TMDL195
The U.S. EPA established the Eel River – South Fork TMDL on December 16, 1999, to address the impairment of the South Fork Eel River and its tributaries due to sediment. These TMDLs do not apply to lands under tribal jurisdiction.

The implementation requirements for the Eel River – South Fork Sediment TMDL in this General Permit are based on the North Coast Sediment TMDL Implementation Policy adopted on November 29, 2004. The North Coast Sediment TMDL Implementation Policy requires the use of existing 194 Eel River – Upper Main Sediment TMDL, p. 54.
195 United States Environmental Protection Agency Region IX, South Fork Eel River Total Maximum Daily Loads for Sediment and Temperature (December 16, 1999) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_s outh_fork/pdf/eel.pdf> [as of April 28, 2022] (Eel River – South Fork Sediment TMDL)

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FACT SHEET FS-165
permitting and enforcement tools to pursue compliance with sedimentrelated standards by all dischargers of sediment waste.196 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Eel River – South Fork Sediment TMDL. · Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources at zero (0) because there are no significant point sources of sediment in the North Fork Eel River watershed.197
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. ix. Gualala River Sediment TMDL198
The U.S. EPA established the Gualala River Sediment TMDL in December 2001 to address the impairment of the Gualala River and its tributaries due to sediment.

The implementation requirements for the Gualala River Sediment TMDL in this General Permit are based on the North Coast TMDL Implementation Policy adopted on November 29, 2004. The Sediment TMDL
Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.199 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Gualala River Sediment TMDL.
196 North Coast Sediment TMDL Implementation Policy.
197 Eel River – North Fork Sediment TMDL, p. 23
198 United States Environmental Protection Agency Region IX, Gualala River Total Maximum Daily Load for Sediment (December, 2001)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/gualala_riv er/110707/gualalafinaltmdl.pdf> [as of May 20, 2021] (Gualala River Sediment TMDL) 199 North Coast Sediment TMDL Implementation Policy.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-166
· Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources at zero (0) because there are no significant individual point sources of sediment in the Gualala River watershed.200
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. x. Mad River Sediment TMDL201
The U.S. EPA established the Mad River Sediment TMDL on December 21, 2007, to address the impairment of the Mad River and its tributaries due to sediment.

The implementation requirements for the Mad River Sediment TMDL in this General Permit are based on the North Coast TMDL Implementation Policy adopted on November 29, 2004. The Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.202 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Mad River Sediment TMDL.
· Waste Load Allocation Translation
The source analysis evaluated sediment loading at a subwatershed scale. The source analysis did not attempt to distinguish sediment loading at the scale of specific land ownerships nor did it distinguish loading between land areas subject to NPDES regulation and land areas not subject to NPDES regulation. Therefore, this TMDL includes separate but identical load allocations for nonpoint sources and waste 200 Gualala River Sediment TMDL, p. 17.
201 United States Environmental Protection Agency Region IX, Mad River Total Maximum Daily Loads for Sediment and Turbidity (December 21, 2007) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/mad_river/ pdf/Mad-TMDL-122107-signed.pdf> [as of May 20, 2021] (Mad River Sediment TMDL) 202 North Coast Sediment TMDL Implementation Policy.

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NPDES No. CAS000002
FACT SHEET FS-167
load allocations for diffuse point sources. Construction activities permitted under this General Permit are considered diffuse point sources and are therefore Responsible Dischargers for this TMDL. This TMDL assigns a waste load allocation for permitted construction activities equivalent to the load allocation for roads.203
Table 39 – Sediment Load Allocations for the Mad River Watershed Sediment Source Load Allocation
(tons/mi2/year)
1940-2004 Loading
(tons/mi2/year)
Percent
Reduction
Roads (Total Sediment) 174 1,540 89 percent
Responsible Dischargers are not to exceed the load allocations for total sediment. Responsible Dischargers are required to calculate their project site annual loading by multiplying the area of the site with this load allocation.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocation. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. xi. Mattole River Sediment TMDL204
The U.S. EPA established the Mattole River Sediment TMDL on December 30, 2002, to address the impairment of the Mattole River and its tributaries due to sediment.

The implementation requirements for the Mattole River Sediment TMDL in this General Permit are based on the North Coast TMDL Implementation Policy adopted on November 29, 2004. The Sediment TMDL
Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.205 The discharge of soil, silt, bark, 203 Mad River Sediment TMDL, p. 91.
204 United States Environmental Protection Agency Region IX, Mattole River Total Maximum Daily Loads for Sediment and Temperature (December 30, 2002) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/mattole_riv er/110707/mattole.pdf> [as of May 20, 2021] (Mattole River Sediment TMDL) 205 North Coast Sediment TMDL Implementation Policy.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-168
sawdust, or other organic and earthen material from construction activities in quantities deleterious to fish, wildlife, or other beneficial uses is prohibited.206 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Mattole River Sediment TMDL.
· Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources at zero (0) because there are no point sources of sediment in the Mattole River watershed.207
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. xii. Navarro River Sediment TMDL208
The U.S. EPA established the Navarro River Sediment TMDL in December 2000 to address the impairment of the Navarro River and its tributaries due to sediment.

The implementation requirements for the Navarro River Sediment TMDL in this General Permit are based on the North Coast TMDL Implementation Policy adopted on November 29, 2004. The Sediment TMDL
Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.209 The discharge of soil, silt, bark, sawdust, or other organic and earthen material from construction activities in quantities deleterious to fish, wildlife, or other beneficial uses is 206 Mattole River Sediment TMDL p. 9.
207 Mattole River Sediment TMDL, p. 41.
208 United States Environmental Protection Agency Region IX, Navarro River Total Maximum Daily Loads for Temperature and Sediment (December 2000) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/navarro_ri ver/110708/navarro.pdf> [as of May 20, 2021] (Navarro River Sediment TMDL) 209 North Coast Sediment TMDL Implementation Policy.

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NPDES No. CAS000002
FACT SHEET FS-169
prohibited.210 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Navarro River Sediment TMDL.
· Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources at zero (0) because there are no known point sources of sediment in the Navarro River and its tributaries.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. xiii. Noyo River Sediment TMDL211
The U.S. EPA established the Noyo River Sediment TMDL on December 16, 1999, to address the impairment of Noyo River due to sediment.

The implementation requirements for the Noyo River Sediment TMDL in this General Permit are based on the North Coast TMDL Implementation Policy adopted on November 29, 2004. The Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.212 The discharge of soil, silt, bark, sawdust, or other organic and earthen material from construction activities in quantities deleterious to fish, wildlife, or other beneficial uses is prohibited.213 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Noyo River Sediment TMDL. 210 Navarro River Sediment TMDL, p. 3.
211 United States Environmental Protection Agency Region IX, Noyo River Total Maximum Daily Load for Sediment (December 16, 1999)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/noyo_river/ pdf/noyo.pdf> [as of May 20, 2021] (Noyo River Sediment TMDL) 212 North Coast Sediment TMDL Implementation Policy.
213 Noyo River Sediment TMDL, p. 10.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-170
· Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources equal to zero (0) because there are no point sources of sediment in Noyo River.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. xiv. Scott River Sediment TMDL214
The North Coast Regional Water Quality Control Board adopted the Scott River Sediment TMDL on December 7, 2005, to address the impairment of Scott River due to sediment.

The implementation requirements for the Scott River Sediment TMDL in this General Permit are based on the Scott River TMDL Action Plan215 which describes the specific implementation actions necessary to fulfill the obligations of the Sediment TMDL Implementation Policy. The Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.216 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Scott River Sediment TMDL.
214 United States Environmental Protection Agency Region IX, Scott River Total Maximum Daily Load for Sediment (December 7, 2005)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/scott_river/ > [as of May 20, 2021] (Scott River Sediment TMDL)
215 North Coast Regional Water Quality Control Board, Action Plan for the Scott River Sediment and Temperature TMDLs (August 11, 2006)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/scott_river/ 060307/bpl/Basin_Plan_Language.pdf> [as of May 20, 2021] (Scott River TMDL Action Plan)
216 North Coast Sediment TMDL Implementation Policy.

Page 715 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-171
· Waste Load Allocation Translation
Construction sites covered by this General Permit are considered to be anthropogenic related sources of sediment to the watershed.

Responsible Dischargers are not to exceed the sum of load allocations assigned to road surface erosion and large or small discrete streamside features, which totals to 69 tons/mi2/year.217 Responsible Dischargers calculate their annual loading by multiplying the area of the site with this load allocation.
· Compliance Actions and Schedule
The Scott River TMDL Action Plan describes the implementation actions necessary to achieve the TMDL within 40 years of U.S. EPA approval of the action plan or September 8, 2046. Since the compliance deadline is in the far future, compliance with this General Permit is considered compliance with the TMDL. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance by September 8, 2046. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocation. xv. Ten Mile River Sediment TMDL218
The U.S. EPA established the Ten Mile River Sediment TMDL in December 2000 to address the impairment of Ten Mile River due to sediment.

The implementation requirements for the Ten Mile River Sediment TMDL in this General Permit are based on the North Coast TMDL Implementation Policy adopted on November 29, 2004. The Sediment TMDL
Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.219 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Ten Mile River Sediment TMDL.
217 Scott River TMDL Action Plan, p. 4-5.00.
218 United States Environmental Protection Agency Region IX, Ten Mile River Total Maximum Daily Load for Sediment (December 2000)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/ten_mile_ri ver/pdf/tenmile.pdf> [as of May 20, 2021] (TMDL Mile River Sediment TMDL) 219 North Coast Sediment TMDL Implementation Policy.

Page 716 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-172
· Waste Load Allocation Translation
This TMDL set a sediment waste load allocation for point sources at zero (0) as there are no point sources of discharge in the basin.220 · Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Quality Control Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit.
xvi. Trinity River Sediment TMDL221
The U.S. EPA established the Trinity River Sediment TMDL on December 20, 2001, to address the impairment of the Trinity River and its tributaries due to sediment. This TMDL does not apply to lands under tribal jurisdiction and South Fork Trinity River.

The implementation requirements for the Trinity River Sediment TMDL in this General Permit are based on the Sediment TMDL Implementation Policy adopted on November 29, 2004. The Sediment TMDL
Implementation Policy directs the use of existing permitting and enforcement tools to pursue compliance with sediment-related standards by all dischargers of sediment waste.222
· Waste Load Allocation Translation
This TMDL identified discharges under the Construction General Permit from construction sites larger than 5 acres as current and prospective point sources that may discharge sediment in the watershed and are therefore considered Responsible Dischargers. The source analysis evaluated sediment loading at a subarea scale. The source analysis did not attempt to distinguish sediment loading at the scale of specific land ownerships nor did it distinguish between land areas subject to NPDES 220 Ten Mile River Sediment TMDL, p. 5.
221 United States Protection Agency Region IX, Trinity River Total Maximum Daily Load for Sediment (December 20, 2001)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/trinity_river /pdf/finaltrinitytmdl.pdf> [as of September 7, 2018] (Trinity River Sediment TMDL) 222 North Coast Sediment TMDL Implementation Policy.

Page 717 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-173
regulation and land areas not subject to NPDES regulation. Therefore, this TMDL includes separate but identical load allocations for nonpoint sources and waste load allocations for each subarea.223 Table 40 – TMDL and Allocations by Source Category for Upper Area (tons/mi2/year)
Source
Categories
Reference
Subwatersheds1
Westside
Tributaries2
Upper
Trinity3
East Fork
Tributaries4
Eastside
Tributaries5
Total
Management 281 105 690 65 60
Percent
Reduction 25 percent 33 percent 46percent 83 percent 37 percent 1 Stuarts Fork, Swift Creek, Coffee Creek
2 Stuart Arm Area, Stoney Creek, Mule Creek, East Fork Stuart Fork, West Side Trinity Lake, Hatchet Creek, Buckeye Creek
3 Upper Trinity River, Tangle Blue, Sunflower, Graves, Bear Upper Trinity Mainstem Area, Ramshorn Creek, Ripple Creek, Minnehaha Creek, Snowslide Gulch Area, Scorpion Creek
4 East Fork Trinity, Cedar Creek, Squirrel Gulch Area
5 East Side Tributaries, Trinity Lake
Table 41 – TMDL and Allocations by Source Category for Upper Middle Area (tons/mi2/year)
Source
Categories
Weaver
and
Rush
Creeks
Deadwood
Creek,
Hoadley
Gulch,
and Poker
Bar Area
Lewiston
Lake
Area
Grass
Valley
Creek1
Indian
Creek
Reading
and
Browns
Creek
Total
Management 169 68 49 44 81 66
Percent
Reduction
41 percent 88 percent 74percent
97 percent
96 percent
82 percent
1 The rate in Grass Valley Creek do not account for the amount of sediment trapped by Buckhorn Dam and Hamilton Ponds
223 Trinity River Sediment TMDL, p. 58.

Page 718 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-174
Table 42 – TMDL and Allocations by Source Category for Lower Middle Area (tons/mi2/year)
Source
Categories
Reference
Subwatersheds1
Canyon
Creek2
Upper
Tributaries3
Middle
Tributaries4
Lower
Tributaries5
Total
Management
(tons/mi2/year)
24 326 67 53 55
Percent
Reduction 0 percent 87percent 50 percent 35 percent 39 percent 1 New River, Big French, Manzanita, North Fork, East Fork, North Fork 2 Canyon Creek
3 Dutch, Soldier, Oregon Gulch, Conner Creek Area
4 Big Bar Area, Prairie Creek, Little French Creek
5 Swede, Italian, Canadian, Cedar Flat, Mill, McDonald, Hennessy, Quinby Creek Area, Hawkins, Sharber
Table 43 – TMDL and Allocations by Source Category for Lower Area (tons/mi2/year)
Source
Categories
Reference
Subwatersheds1
Mill
Creek
and Tish
Tang
Willow
Creek
Campbell
Creek and
Supply
Creek
Lower
Mainstem
Area and
Coon Creek2
Total
Management
(tons/mi2/year)
528 210 94 1961 63
Percent
Reduction 11 percent 74percent
91 percent 87 percent 44 percent
1 Horse Linto Creek
2 Since background rates for Lower Mainstem Area and Coon Creek were not available from GMA (2001), EPA used the same rate as was calculated for the Quinby Creek Area, which is immediately upstream, because Quinby Creek Area is comparable in size and underlain by the same geology type (Galice Formation).

The U.S. EPA expects the waste load allocations to be evaluated on a ten-year rolling average basis because of the natural variability in sediment delivery rates and does not expect the load allocation to be met for every square mile within a source category.224 Responsible Dischargers are not to exceed the load allocations or reductions assigned to the “Total Management” source category, provided in tons/mi2/yr. These allocations vary by subwatershed, as noted in Table 40 through Table 43 above. Responsible Dischargers calculate their 224 Trinity River Sediment TMDL, p. 63.

Page 719 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-175
annual loading by multiplying the area of the site with the appropriate load allocation.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H.

The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. xvii. Van Duzen River Sediment TMDL225
The U.S. EPA established the Van Duzen River Sediment TMDL on December 16, 1999, to address the impairment of the Van Duzen River and its tributaries due to sediment. These TMDLs do not apply to lands under tribal jurisdiction.

The implementation requirements for the Van Duzen River Sediment TMDL in this General Permit are based on the North Coast Sediment TMDL Implementation Policy adopted on November 29, 2004. The North Coast Sediment TMDL Implementation Policy requires the use of existing permitting and enforcement tools to pursue compliance with sedimentrelated standards by all dischargers of sediment waste.226 Construction stormwater dischargers covered under this General Permit are considered Responsible Dischargers for the Van Duzen River Sediment TMDL. · Waste Load Allocation Translation
This TMDL set the sediment waste load allocation for point sources at zero (0) because there are no point sources of sediment in the Van Duzen River watershed.227
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and the Sediment TMDL Requirements in Attachment H. 225 United States Environmental Protection Agency Region IX, Van Duzen River and Yager Creek Total Maximum Daily Load for Sediment (December 16, 1999) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/vanduzen_ river/pdf/vanduzen.pdf> [as of May 20, 2021] (Van Duzen River Sediment TMDL) 226 North Coast Sediment TMDL Implementation Policy.
227 Van Duzen River Sediment TMDL, p. 46.

Page 720 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-176
The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocation. The North Coast Sediment TMDL Implementation Policy does not include an implementation date for this TMDL. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit. xviii. Lagunitas Creek Sediment TMDL228
The San Francisco Bay Regional Water Quality Control Board adopted the Lagunitas Creek Sediment TMDL on June 11, 2014, to address the impairment of Lagunitas Creek due to sediment. Point sources of sediment in the watershed contribute minimal sediment loading and are associated with municipal and construction stormwater runoff, which are regulated through NPDES permits. Construction sites that discharge into the Lagunitas Creek watershed are therefore considered Responsible Dischargers.
· Waste Load Allocation Translation
The Lagunitas Creek Sediment TMDL set the sediment waste load allocation for construction stormwater runoff at 30 tons/year, which is equivalent to the current load from construction sites. Per the implementation measures of this TMDL, complying with the requirements of this General Permit is appropriate in addressing this waste load allocation.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit upon its effective date. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocation.

The final compliance deadline for the Lagunitas Creek Sediment TMDL is June 11, 2034. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance by June 11, 2034.
228 San Francisco Bay Regional Water Quality Control Board, Lagunitas Creek Fine Sediment Reduction and Habitat Enhancement Plan (March 10, 2014), <https://www.waterboards.ca.gov/sanfranciscobay/water_issues/programs/TMDLs/lag unitascrksediment/LagunitasSedimentHabitat%20StaffReportPublicReviewDraft.pdf> [as of April 28, 2022] (Lagunitas Creek Sediment TMDL)

Page 721 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-177
xix. Napa River Sediment TMDL229
The San Francisco Bay Regional Water Quality Control Board adopted the Napa River Sediment TMDL on September 9, 2009, to address the impairment of Napa River due to sediment. Point sources of sediment that were identified as contributors of sediment to the watershed are associated with urban stormwater runoff, including construction stormwater runoff, and wastewater treatment plants, which are regulated by NPDES permits.

Construction sites that discharge into the Napa River watershed are therefore considered Responsible Dischargers.
· Waste Load Allocation Translation
The Napa River Sediment TMDL set the sediment waste load allocation for construction stormwater runoff at 500 tons/year, which is equivalent to the current load from construction sites. Per the implementation measures of this TMDL, complying with the requirements of this General Permit is appropriate in addressing this waste load allocation. · Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit upon its effective date. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocation.

The final compliance deadline for the Napa River Sediment TMDL is September 9, 2029. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance by September 9, 2029.
xx. Pescadero and Butano Creek Sediment TMDL230
The San Francisco Bay Regional Water Quality Control Board adopted the Pescadero and Butano Creek Sediment TMDL on June 13, 2018, to 229 San Francisco Bay Regional Water Quality Control Board, Napa River Sediment Reduction and Habitat Enhancement Plan (September 15, 2009), <https://www.waterboards.ca.gov/rwqcb2/water_issues/programs/TMDLs/napariverse dimenttmdl.html#:~:text=The%20Napa%20River%20Sediment%20TMDL,healthy%20f ishery%20in%20this%20watershed.> [as of April 28, 2022] (Napa River Sediment TMDL)
230 San Francisco Bay Regional Water Quality Control Board, Pescadero-Butano Watershed Sediment TMDL and Habitat Enhancement Plan (December 11, 2018),

Page 722 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-178
address the impairment of Pescadero and Butano Creek due to sediment.

The only known point sources of sediment to the watershed are associated with stormwater runoff from state highways, municipalities, and construction sites; which are regulated by NPDES permits. Construction sites that discharge into the Pescadero-Butano Creek watershed are therefore considered Responsible Dischargers.
· Waste Load Allocation Translation
The Pescadero and Butano Creek Sediment TMDL set the sediment waste load allocation for construction stormwater runoff at 150 tons/year, which is equivalent to the current load from construction sites. Per the implementation measures of this TMDL, complying with the requirements of this General Permit is appropriate in addressing this waste load allocation.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit upon its effective date. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations.

The final compliance deadline for the Pescadero and Butano Creek Sediment TMDL is June 13, 2038. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance by June 13, 2038.
xxi. Sonoma Creek Sediment TMDL231
The San Francisco Bay Regional Water Quality Control Board adopted the Sonoma Creek Sediment TMDL on December 10, 2008, to address the impairment of Sonoma Creek due to sediment. The only known point sources of sediment to the watershed are associated with urban stormwater runoff from state highways, municipalities, industrial facilities, and construction sites; which are regulated by NPDES permits. Construction <https://www.waterboards.ca.gov/sanfranciscobay/water_issues/programs/TMDLs/pe scadero/BPA%20FINAL.pdf> [as of May 20, 2021] (Pescadero and Butano Creek Sediment TMDL)
231 San Francisco Bay Regional Water Quality Control Board, Sonoma Creek Watershed Sediment TMDL and Habitat Enhancemnt Plan (December 12, 2008), <https://www.waterboards.ca.gov/rwqcb2/water_issues/programs/TMDLs/napariverse dimenttmdl.html> [April 28, 2022] (Sonoma Creek Sediment TMDL)

Page 723 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-179
sites that discharge into the Sonoma Creek watershed are therefore considered Responsible Dischargers.
· Waste Load Allocation Translation
The Sonoma Creek Sediment TMDL set the sediment waste load allocation for construction stormwater runoff at 300 tons/year, which is equivalent to the current load from construction sites. Per the implementation measures of this TMDL, complying with the requirements of this General Permit is appropriate in addressing this waste load allocation.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit upon its effective date. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocation.

The final compliance deadline for the Sonoma Creek Sediment TMDL is December 10, 2028. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance by December 10, 2028.
xxii. San Lorenzo River Sediment TMDL232
The Central Coast Regional Water Quality Control Board adopted the San Lorenzo River Sediment TMDL on May 16, 2003, to address the sediment related impairment of San Lorenzo River which is accelerated by anthropogenic watershed disturbances. The source analysis did not distinguish sediment loading between point and nonpoint sources, but rather assigned load allocations to water bodies within the San Lorenzo River watershed. Construction activities were included under the load allocation for Other Urban and Rural Lands sediment category. Therefore, construction sites covered under this General Permit are considered Responsible Dischargers.
232 Central Coast Regional Water Quality Control Board, San Lorenzo River Total Maximum Daily Load and Implementation Plan for Sediment Including Carbonera Creek, Lompico Creek, and Shingle Mill Creek (May 16, 2003), <https://www.waterboards.ca.gov/centralcoast/water_issues/programs/tmdl/docs/san_ lorenzo/sediment/index.html> [as of May 20, 2021] (San Lorenzo River Sediment TMDL)

Page 724 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-180
· Waste Load Allocation Translation
The San Lorenzo River Sediment TMDL did not establish a waste load allocation for construction sites, as it is included in the load allocation for the Other Urban and Rural Lands sediment category as indicated in Table 44 below.

Table 44 – Other Urban and Rural Land Load Allocations for San Lorenzo River Sediment TMDL
Water Body Allocation (tons/yr)
Carbonara Creek 2,622
Lompico Creek 965
Shingle Mill Creek 310
San Lorenzo River 43,368
Per the San Lorenzo River Sediment TMDL implementation plan, complying with the requirements of this General Permit is appropriate to meet the load allocations.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit upon its effective date. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about excessive sediment loading.

The final compliance deadline for the San Lorenzo River Sediment TMDL is May 16, 2028. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance by May 16, 2028.
xxiii. Squaw Creek Sediment TMDL233
The Lahontan Regional Water Quality Control Board adopted the Squaw Creek Sediment TMDL in April 2006 to address the impairment of Squaw Creek due to sediment. Accelerated hillslope erosion from land disturbances related to development in natural erosion-prone areas contribute to excess sediment delivery to the creek. Therefore, construction sites covered under this General Permit are considered Responsible Dischargers. 233 Lahontan Regional Water Quality Control Board, Total Maximum Daily Load for Sediment, Squaw Creek, Placer County (April 2006),
<https://www.waterboards.ca.gov/lahontan/water_issues/programs/tmdl/squaw_creek/ docs/basin_plan_amendment_final.pdf> [as of May 20, 2021] (Squaw Creek Sediment TMDL)

Page 725 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-181
· Waste Load Allocation Translation
There are currently no NPDES-regulated point sources in the watershed; therefore, the waste load allocation is zero (0).234 Additionally, the load allocations are not viewed as appropriate for discharge specifications in permits as they are broad estimates. Based on the assumptions for assigning the requirements of this TMDL, complying with the requirements of this General Permit is appropriate in addressing this waste load allocation.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit upon its effective date. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about excessive sediment loading.

The final compliance deadline for the Squaw Creek Sediment TMDL was estimated to be 20 years, or April 2026. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance by April 2026.
xxiv. Truckee River Sediment TMDL235
The Lahontan Regional Water Quality Control Board adopted the Truckee River Sediment TMDL in May 2008 to address the impairment of the Middle Truckee River Watershed due to sediment discharges during high-flow events such as those caused by thunderstorms. Primary sources of sediment include runoff from urban areas, dirt roads, legacy erosion sites, and graded ski runs. Although not explicitly stated, construction sites within urban areas or that utilize dirt roads, covered under this General Permit, can contribute to sediment loading in the Truckee River watershed and are therefore considered Responsible Dischargers.
· Waste Load Allocation Translation
This TMDL set a total waste load allocation for all sediment point sources at 4,936 tons/yr. The source analysis did not attempt to distinguish sediment loading at the scale of specific land ownerships. 234 Squaw Creek Sediment TMDL, p. 2.
235 Lahontan Regional Water Quality Control Board, Total Maximum Daily Load for Sediment Middle Truckee River Watershed (May 2008),
<https://www.waterboards.ca.gov/lahontan/water_issues/programs/tmdl/truckee/docs/ adopted_basinplan_amendment.pdf> [as of May 20, 2021] (Truckee River Sediment TMDL)

Page 726 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-182
NPDES-regulated point sources are expected to achieve compliance through the requirements of their respective NPDES permits. Per the implementation plan of the Truckee River Sediment TMDL, compliance with this General Permit is appropriate in addressing this waste load allocation.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit upon its effective date. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about excessive sediment loading.

The final compliance deadline for the Truckee River Sediment TMDL was estimated to be 20 years, or May 2028. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance by May 2028.
xxv. San Diego Creek and Newport Bay Sediment TMDL236
The Santa Ana Regional Water Quality Control Board adopted the San Diego Creek and Newport Bay Sediment TMDL on April 16, 1999, to address the erosion in the San Diego Creek watershed and resultant siltation in Newport Bay. Anthropogenic activities such as extensive grading for development and increased runoff due to urbanization contribute to sediment loading in this watershed. Construction sites covered under this General Permit are considered Responsible Dischargers for this TMDL. · Load Allocation Translation
The San Diego Creek and Newport Bay Sediment TMDL assigns a load allocation of 13,000 tons/yr to construction sites that discharge to Newport Bay and 13,000 tons/yr to construction sites that discharge into the San Diego Creek watershed. The load allocations are shared amongst all construction sites within the Newport Bay/San Diego Creek watershed and are implemented as a 10-year running annual average.

The primary implementation measure for this TMDL is complying with the requirements of this General Permit which is expected to be appropriate to address this load allocation.
236 Santa Ana Regional Water Quality Control Board, Basin Plan Amendment Total Maximum Daily Load for Sediment in the Newport Bay/San Diego Creek Watershed (April 16, 1999)
<https://www.waterboards.ca.gov/santaana/water_issues/programs/tmdl/docs/tmdl02. pdf> [as of May 20, 2021] (San Diego Creek and Newport Bay Sediment TMDL)

Page 727 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-183
Responsible Dischargers shall comply with the requirements of this General Permit upon its effective date. The Regional Water Board may assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about excessive sediment loading.

The San Diego Creek and Newport Bay Sediment TMDL does not include a deadline to achieve compliance. Therefore, Responsible Dischargers are required to comply with this TMDL upon the effective date of this General Permit.
xxvi. Los Peñasquitos Lagoon Sediment TMDL237
The San Diego Regional Water Quality Control Board adopted the Los Peñasquitos Lagoon Sediment TMDL on June 13, 2012, to address the impairment of Los Peñasquitos Lagoon due to sediment.

The watershed sources of sediment consist of point and non-point source discharges in the watershed draining into Los Peñasquitos Lagoon.

Anthropogenic activities such as land development exacerbate erosive processes by exposing sediment and creating more impervious surfaces which increases the velocity and volume of runoff. The Los Peñasquitos Lagoon Sediment TMDL identifies construction stormwater discharges as contributing sediment to the Lagoon and are therefore considered Responsible Dischargers.238 According to the Los Peñasquitos Lagoon Sediment TMDL staff report, the potential contribution of pollutant loadings from construction stormwater is low because non-stormwater discharges are prohibited or authorized under strict permit circumstances.239 · Waste Load Allocation Translation
The Los Peñasquitos Lagoon Sediment TMDL assigns a final waste load allocation of 2,580 tons/year to the combined responsible parties for discharges into the Los Peñasquitos Lagoon Watershed.240 Responsible 237 San Diego Regional Water Quality Control Board, Amendment to the Water Quality Control Plan for the San Diego Basin (9) to Incorporate the Sediment Total Maximum Daily Load (TMDL) for Los Peñasquitos Lagoon (June 13, 2012) <https://www.waterboards.ca.gov/sandiego/board_decisions/adopted_orders/2012/R9 -2012-0033_Attach_A.pdf> [as of May 20, 2021] (Los Peñasquitos Lagoon Sediment TMDL)
238 Los Peñasquitos Lagoon Sediment TMDL, p. A-5.
239 San Diego Regional Water Quality Control Board, Sediment TMDL for Los Peñasquitos Lagoon Staff Report (June 13, 2012),
<https://www.waterboards.ca.gov/sandiego/water_issues/programs/tmdls/docs/los_pe nasquitos_lagoon/updates071212/Staff_Report.pdf> [as of May 20, 2021] 240 Los Peñasquitos Lagoon Sediment TMDL, p. A-6.

Page 728 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-184
parties include: Phase I Municipal Separate Storm Sewer Systems (MS4s) co-permittees (the County of San Diego, City of San Diego, City of Del Mar, and City of Poway), Phase II MS4 permittees, the California Department of Transportation, and general construction and industrial stormwater NPDES permittees. The Phase I MS4 co-permittees and the California Department of Transportation are responsible for assuming the lead role in coordinating and carrying out the necessary actions, compliance monitoring requirements, and successful implementation of the adaptive management framework required as part of this TMDL.

Responsible Dischargers are expected to cooperate with all responsible parties to reduce their collective sediment load.

Responsible Dischargers are required to monitor sediment discharges from their sites to demonstrate progress towards compliance with final waste load allocations.
241 Monitoring flow rates for construction
stormwater discharges is not required for all dischargers in this General Permit and is specific to Responsible Dischargers located in the Los Peñasquitos Lagoon Watershed to assess the correlation between flow and sediment deposition in this water body.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit and are required to provide an estimate of a representative flow rate from their construction site for at least one precipitation event that generates discharge within the reporting year.

Monitoring flow rate values should be consistent with the monitoring, calculation, and reporting methods and framework used by the Phase I MS4 co-permittees. Responsible Dischargers shall submit the representative flow estimate as a PDF attachment to the Annual Report required in this General Permit.
242 The Regional Water Board may
assign additional monitoring, reporting, and BMP requirements upon obtaining site specific information about exceedances of the waste load allocations.

Compliance actions will be required upon the effective date of this General Permit. The final compliance deadline for the Los Peñasquitos Lagoon TMDL is July 14, 2034. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or 241 Los Peñasquitos Lagoon Sediment TMDL, p. A-8.
242 Unless another alternative electronic method in SMARTS is provided by the Water Boards.

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ORDER WQ 2022-0057-DWQ
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FACT SHEET FS-185
interim targets to progress towards the required final compliance by July 14, 2034.
f. Temperature TMDLs
Seven Temperature TMDLs, established by the U.S. EPA, are applicable to construction stormwater dischargers. These include the Temperature TMDLs for the Mattole River,
243 Navarro River,244 Scott River245 and the Lower Main,246 Middle Main,
247 North Fork,248 and Upper Main249 extents of the Eel River. 243 United States Environmental Protection Agency Region IX, Mattole River TMDL for Sediment and Temperature (December 30, 2002),
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/mattole_riv er/110707/mattole.pdf> [as of May 20,2021] (Mattole River Temperature TMDL) 244 United States Environmental Protection Agency Region IX, Navarro River TMDL for Sediment and Temperature (November 2004),
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/navarro_ri ver/110708/navarro.pdf> [as of May 20, 2021] (Navarro River Temperature TMDL) 245 North Coast Regional Water Quality Control Board, Scott River TMDL (June 2018), Ch. 4, p. 65,
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/scott_river > [as of April 28,2022] (Scott River Temperature TMDL)
246 United States Environmental Protection Agency Region IX, Lower Eel River Total Maximum Daily Loads for Temperature and Sediment (December 18, 2007) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_l ower/pdf/LER-TMDL-final-121807-signed.pdf> [as of April 28, 2022] (Eel River – Lower Main Temperature TMDL)
247 United States Environmental Protection Agency Region IX, Final Middle Main Eel River and Tributaries (from Dos Rios to the South Fork) Total Maximum Daily Loads for Temperature and Sediment (December 31, 2005)
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_ middle_main/pdf/mainmdl-eel-final.pdf> [April 28, 2022] (Eel River – Middle Main Temperature TMDL)
248 United States Environmental Protection Agency Region IX, North Fork Eel River Total Maximum Daily Loads for Sediment and Temperature (December 30, 2002) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_n orth_fork/pdf/final.pdf> [as of April 28, 2022] (Eel River – North Fork Temperature TMDL)
249 United States Environmental Protection Agency Region IX, Final Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment (December 29, 2004) <https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/eel_river_u per_main/pdf/uer-tmdl-final-12-28.pdf> [as of April 28, 2022] (Eel River – Upper Main Temperature TMDL)

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-186
Stream temperature is a critical physical characteristic of aquatic habitats that directly impacts salmonid species. Metabolism, food requirements, growth rates, timing of adult migration upstream, timing of juvenile migration downstream, and sensitivity to diseases are all affected by stream temperature.

Although stream temperatures in Northern California naturally provide a wide range of summer conditions for rearing salmonids, the removal of riparian vegetation from road building and urbanization are amongst the sources observed to increase stream temperatures. Excessive sediment input also raises stream temperature by widening stream channels, filling pools, and eliminating riparian vegetation during flood events.250 The requirements set forth in these TMDLs apply to all point sources within the watersheds of these water bodies, which was assumed to include construction stormwater discharges. Therefore, dischargers covered under this General Permit are considered Responsible Dischargers for the Temperature TMDLs.

The Temperature TMDLs for the Klamath River, Shasta River, and the Middle Fork of the Eel River were not translated for this General Permit. These TMDLs had no known point sources that increase stream temperature and therefore did not assign any waste load allocations.
· Waste Load Allocation Translation
The Temperature TMDLs define the waste load allocations in two different ways:

1. The TMDL for the Lower Main Eel River assigns a waste load allocation of “zero (0) net increase in receiving water temperature” to construction sites subject to this General Permit.

2. The TMDLs for the Mattole River, Navarro River, Scott River and the Middle Main, North Fork, and Upper Main extents of the Eel River set the waste load allocation at zero (0), as no point sources are considered to contribute to the total loading of the respective water bodies.

The two waste load allocation definitions will be translated similarly and require that the Responsible Dischargers do not produce discharges that result in elevated stream temperatures.

The implementation requirements for the Temperature TMDLs in this General Permit are based on the Temperature Implementation Policy adopted by the North Coast Regional Water Quality Control Board on March 13, 2014. The North Coast Temperature Implementation Policy requires the use of existing permitting and enforcement tools such as NPDES permits to pursue compliance with the water quality objectives for temperature. 250 Eel River – Upper Main Temperature TMDL, p. 7.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-187
Additionally, the Temperature Implementation Policy251 relies on the Sediment TMDL Implementation Policy252 as a means of addressing elevated water temperatures associated with excess sediment discharges.253 The effective implementation of erosion and sediment controls, as well as meeting post-construction standards, required by this General Permit are expected to achieve the waste load allocation.

Therefore, complying with the requirements of this General Permit is consistent with the assumptions and requirements of the Temperature and Sediment TMDL Implementation Policies.
· Compliance Actions and Schedule
Compliance with this General Permit’s requirements is consistent with the assumptions and requirements of the Temperature Implementation Policy and is sufficient to achieve the assigned waste load allocation. Responsible Dischargers that implement BMPs specific to preventing or controlling stormwater exposure with sediment and comply with post-construction standards are expected to meet the assigned waste load allocation. If a BMP is observed failing, the Responsible Discharger shall evaluate the BMPs being used and implement a strategy in the site’s SWPPP to prevent potential exceedances of the waste load allocation in the future. The Regional Water Quality Control Boards may assign additional monitoring, reporting, and BMP requirements upon obtaining site-specific information about exceedances of the waste load allocation.

The North Coast Temperature Implementation Policy does not include an implementation deadline for Temperature TMDLs. Therefore, Responsible Dischargers are required to comply with the Temperature TMDLs upon the effective date of this General Permit, as listed in Table H-2 of Attachment H. 251 North Coast Regional Water Quality Control Board, Policy for the Implementation of the Water Quality Objectives for Temperature (March 13, 2014), <https://www.waterboards.ca.gov/northcoast/water_issues/programs/basin_plan/temp erature_amendment/> [as of May 20, 2021], (North Coast Temperature Implementation Policy)
252 North Coast Regional Water Quality Control Board, Total Maximum Daily Load Implementation Policy Statement for Sediment-Impaired Receiving Waters in the North Coast Region (November 29, 2004),
<https://www.waterboards.ca.gov/northcoast/water_issues/programs/tmdls/sediment_t mdl_implementation/> [as of May 20, 2021] (North Coast Sediment TMDL Implementation Policy)
253 North Coast Temperature Implementation Policy, p.4.200.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-188
g. Metals and Toxics TMDLs
Seventeen (17) Metals and/or Toxics TMDLs are translated for this General Permit. Metals can be toxic to aquatic life and cause impairments of beneficial uses within water bodies. Many of the artificial surfaces of the urban environment (e.g., galvanized metal, paint, automobiles, or preserved wood) contain metals, which enter stormwater as the surfaces corrode, flake, dissolve, decay, or leach.254
Other toxic pollutants in stormwater include organochlorine (OC) pesticides (chlordane, DDD, DDE, DDT, dieldrin, and toxaphene), polycyclic aromatic hydrocarbons (PAHs), and polychlorinated biphenyls (PCBs), which can contribute to the impairment of beneficial uses within water bodies. The use of these pollutants has been banned for many years because of potential human health and environmental harm, however, the physio-chemical properties of the pollutants allow them to persist in the environment, bioaccumulate through the food web, and pose risks to aquatic life, wildlife, and human health.

The primary transport mechanism for the metals and toxics is the mobilization of fine sediment via stormwater and authorized NSWDs. OC pesticides, PAHs, PCBs, and metals have an affinity for organic matter and will partition from water and sorb to organic substances such as sediment. Sediment and particulates transported through construction stormwater discharges eventually settle in the bed of the receiving water.

Some of the TMDLs addressed in this Section have receiving water sediment numeric targets translated to dry-weight sediment concentration waste load allocations to be met by Responsible Dischargers at the site’s discharge location(s). The sediment targets address receiving waterbed-toxicity. Because these TMDLs associate receiving waterbed-toxicity targets to discharges of metals, OC pesticides, PAHs, and PCBs bound to sediment particulates, these TMDLs are addressed by implementing sediment control measures so that sediment-bound particulates do not leave a construction site’s area and settle in the receiving waterbed via stormwater discharges and authorized NSWDs.

This General Permit currently requires implementation of site-specific erosion and sediment controls to minimize sediment in construction runoff. The sitespecific erosion control requirements address erosion in downstream channels and banks, upgradient run-on flow diversion conveyances, and cut and fill slopes.
254 CASQA, California Stormwater Best Management Practice Handbook: Construction (July 2015). <https://www.casqa.org/resources/bmp-handbooks/construction>. [as of May 20, 2021]. (CASQA Construction BMP Handbook).

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-189
In addition, Responsible Dischargers with the potential to discharge into a TMDL watershed, water body, or reach are required to install erosion controls that will result in predicted erosion rates that are as protective as preconstruction conditions (e.g., undisturbed vegetation for the area) for each phase of the construction project. The Responsible Discharger shall use RUSLE2 to calculate the predicted erosion rates, as described in Attachment H.

Sediment produced by erosion occurring in channels is not estimated by RUSLE2255. This General Permit controls channel erosion by requiring engineered conveyance of up gradient run-on water, channel and streambank erosion control, and peak flowrate and volume controls.

Other TMDLs addressed in this Section assign waste load allocations to Responsible Dischargers in one of the following ways:
· A fixed concentration-based waste load allocation as a solution of effluent, where a concentration-based waste load allocation is assigned directly to Responsible Dischargers at the point of discharge;
· A fixed concentration-based waste load allocation as dry-weight sediment, where a concentration-based waste load allocation is assigned directly to Responsible Dischargers at the point of discharge;
· A hardness-based floating concentration waste load allocation, where the waste load allocation is hardness dependent on receiving water; or · A waste load allocation that assigned both a mass-based waste load allocation and a concentration-based waste load allocation Concentration-based waste load allocations, where applicable, were translated into numeric action levels or numeric effluent limitations for Responsible Dischargers to comply with.
i. Ballona Creek Metals TMDL256
The Los Angeles Water Quality Control Board (Los Angeles Regional Water Quality Control Board) adopted the Ballona Creek Metals TMDL on 255 USDA-Agricultural Research Service, DRAFT User’s Reference Guide Revised Universal Soil Loss Equation Version 2 (May 2008), p. 22-23 <http://fargo.nserl.purdue.edu/rusle2_dataweb/userguide/RUSLE2_User_Ref_Guide_ 2008.pdf> [as of May 20, 2021]
256 Los Angeles Regional Water Quality Control Board, Proposed Amendment to the Water Quality Control Plan – Los Angeles Region to incorporate the Ballona Creek Metals TMDL
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/Ballon a20Metals/R13-010M_RB_BPA.pdf> [as of April 28, 2022] (Ballona Creek Metals TMDL)

Page 734 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-190
September 6, 2007, to address the impairment of Ballona Creek and Sepulveda Canyon Channel due to copper, lead, and zinc. · Source Analysis
Storm drains convey a large percentage of metals loadings during dry weather. During wet weather, most of the metals loadings in Ballona Creek are in particulate form and are associated with wet-weather storm flows.257
· Waste Load Allocation Translation
1) Dry-Weather Waste Load Allocation
The Ballona Creek Metals TMDL assigns a dry-weather waste load allocation of zero (0) for Responsible Dischargers. Non-Stormwater Discharges (NSWDs) are authorized in this General Permit if Order, Section IV.A terms and conditions are met to control the discharge of pollutants from the construction site. Order, Section IV.B prohibits all NSWDs not authorized under Order, Section IV.A; therefore, all unauthorized NSWDs must be either eliminated or have regulatory coverage under a separate NPDES permit. Authorized NSWDs, as defined in this General Permit, are authorized because these discharges do not comingle with stormwater associated with construction activity. The Regional Water Board may impose additional requirements on NSWDs if deemed necessary per sitespecific analysis. 2) Wet-Weather Waste Load Allocations
The Ballona Creek Metals TMDL assigns mass-based waste load allocations per construction area in grams per day per acre (g/day/acre) for copper, lead, and zinc. The waste load allocations for metals are shown in Table 45 below.

Table 45 – Ballona Creek and Sepulveda Channel Waste Load Allocations Pollutant Waste Load Allocation (g/day/acre)
Copper 1.673 x 10-10 x Daily storm volume (L)
Lead 9.369x 10-10 x Daily storm volume (L)
Zinc 1.279 x 10-9 x Daily storm volume (L)
Directly implementing the copper, lead, and zinc waste load allocations will result in a unique mass load for each Responsible Discharger dependent on the area of the construction site. Requiring 257 Ballona Creek Metals TMDL, p. 3.

Page 735 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-191
Responsible Dischargers to calculate the construction site’s specific mass loading of a pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most metal loadings in this watershed are in particulate form and associated with wet-weather flows. Therefore, the following will address this TMDL:
a) Comply with the site-specific erosion and sediment control, and post-construction requirements in this General Permit.
b) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as pre-construction (e.g., undisturbed vegetation for the area) conditions. Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of the copper, lead, and zinc, through the required pollutant source assessment, are to implement BMPs specific to preventing or controlling stormwater exposure to the identified metals. Furthermore, Responsible Dischargers are to comply with the RUSLE2 modeling requirements in Attachment H, Section I.G.2.

The TMDL’s final compliance deadline was January 11, 2015. Since this compliance deadline has passed, the Responsible Dischargers shall comply with the requirements of this General Permit and the RUSLE2 modeling requirements in Attachment H, Section I.G.2, upon the effective date of this General Permit.
ii. Ballona Creek Estuary Toxics TMDL258
The Los Angeles Regional Board adopted the Ballona Creek Estuary Toxics TMDL on July 7, 2005, to address the impairment of Ballona Creek and Ballona Creek Estuary (Ballona Watershed) due to cadmium, chlordane, copper, DDT, lead, polychlorinated biphenyls (PCBs), polyaromatic hydrocarbons (PAHs), silver, toxicity in sediment, and zinc. Chlordane and DDT are organochlorine (OC) pesticides. The Ballona Creek Estuary Toxics 258 Los Angeles Regional Water Quality Control Board, Proposed Amendment to the Water Quality Control Plan – Los Angeles Region to incorporate the Ballona Creek Estuary Toxic Pollutants TMDL
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/Ballon a%20Toxics/R13-010T_RB_BPA.pdf> [as of May 20, 2021] (Ballona Creek Estuary Toxics TMDL)

Page 736 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-192
does not include a TMDL for PAHs because recent data does not show PAH levels exceeding the numeric targets.259
· Source Analysis
The Ballona Creek Estuary Toxics TMDL identifies urban stormwater as a substantial source of metals and the most prevalent metals in urban stormwater are consistently associated with particulates. As a result, metals have the potential to accumulate in estuarine sediments where they may pose a toxicity risk. A majority of organic constituents in stormwater such as PAHs, phthalates, and OC compounds are also associated with particulates.260
· Waste Load Allocation Translation
The Ballona Creek Estuary Toxics TMDL assigns grouped mass-based waste load allocations per construction area in grams per year per acre (g/yr/ac) for cadmium, chlordane, copper, DDT, lead, PAHs, PCBs, silver, toxicity in sediment, and zinc. The waste load allocations for are shown in Table 46 below.

Table 46 – Ballona Creek Estuary Waste Load Allocations Pollutant Waste Load Allocation (g/yr/ac)
Cadmium 0.1
Copper 3
Lead 4
Silver 0.1
Zinc 13
Chlordane 0.00011
DDTs 0.00016
Total PCBs 0.00028
Directly implementing the waste load allocations will result in a unique mass load for each Responsible Discharger dependent on the area of construction site. Requiring Responsible Dischargers to calculate the construction site’s specific mass loading of a pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most metal and toxic pollutant loadings in this watershed are in particulate form and associated with wet-weather flows. Therefore, the following will address this TMDL:
259 Ballona Creek Estuary Toxics TMDL, p. 2.
260 Ballona Creek Estuary Toxics TMDL, p. 3.

Page 737 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-193
1) Comply with the site-specific erosion and sediment control, and postconstruction requirements in this General Permit. 2) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as preconstruction (e.g., undisturbed vegetation for the area) conditions.

Furthermore, Responsible Dischargers are to comply with the RUSLE2 modeling requirements in Attachment H, Section I.G.2.

The TMDL’s final compliance deadline was January 11, 2015. Since this compliance deadline has passed, the Responsible Dischargers shall comply with the requirements of this General Permit and the RUSLE2 modeling requirements in Attachment H, Section I.G.2, upon the effective date of this General Permit.
iii. Calleguas Creek Metals and Selenium TMDL261
The Los Angeles Water Quality Control Board (Los Angeles Water Board) adopted the Calleguas Creek Metals and Selenium TMDL on October 13, 2016, to address the impairment of Calleguas Creek, Mugu Lagoon, and Revolon Slough due to copper, mercury, nickel, and selenium. · Source Analysis
The significant sources of metals and selenium in the watershed include urban runoff, agricultural runoff, POTW effluent, and groundwater. Open space was also a significant source for mercury.

Higher loads were delivered during wet weather for all constituents due to the association between metals and particulate matter. The source analysis indicates that naturally occurring metals and selenium may be contributing sources in soil. The Calleguas Creek Metals and Selenium 261 Los Angeles Regional Water Quality Control Board, Total Maximum Daily Load for Metals and Selenium in the Calleguas Creek, its Tributaries and Mugu Lagoon <https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/R16- 007_RB_BPA.pdf> [as of May 20, 2021] Calleguas Creek Metals and Selenium TMDL)

Page 738 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-194
TMDL includes plans for special studies to further assess natural sources of metals in soil.262
· Waste Load Allocation Translation
1) Dry-weather Waste Load Allocations
The Calleguas Creek Metals and Selenium TMDL assigns
concentration-based waste load allocations for dry-weather. NonStormwater Discharges (NSWDs) are authorized in this General Permit if Order, Section IV.A terms and conditions are met to control the discharge of pollutants from the construction site. Order, Section IV.B prohibits all NSWDs not authorized under Order, Section IV.A; therefore, all unauthorized NSWDs must be either eliminated or have regulatory coverage under a separate NPDES permit. Authorized NSWDs, as defined in this General Permit, are authorized because these discharges do not commingle with stormwater associated with construction activity. The Regional Water Board may impose additional requirements on NSWDs if deemed necessary per site-specific analysis.
2) Wet-weather Interim Waste Load Allocations for Copper The Calleguas Creek Metals and Selenium TMDL assigns an interim concentration-based wet-weather waste load allocation for copper to “Permitted Stormwater Dischargers (PSDs)” to be met at the receiving water. Responsible Dischargers are identified as a PSDs as defined in the Calleguas Creek Metals and Selenium TMDL.263 The interim wet daily maximum concentration-based waste load allocation will be translated into a numeric action level for Responsible Dischargers until the final waste load allocations apply. The interim waste load allocations were translated into numeric action levels as shown in Table 47 below. The numeric action levels are in mg/L to be consistent with the reporting units in SMARTS.

Table 47 – Calleguas Creek, Conejo Creek, and Revolon Slough Interim WetWeather Waste Load Allocations Water body Waste Load Allocation
for Copper (ug/L)
Total Copper Numeric
Action Level (mg/L)
Calleguas and Conejo
Creek 204 0.204
Revolon Slough 204 0.204
262 Calleguas Creek Metals and Selenium TMDL, p. 4, p. 13. 263 Calleguas Creek Metals and Selenium TMDL, p. 19.

Page 739 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-195
3) Wet-weather Final Waste Load Allocations Copper, Nickel, and Selenium
The Calleguas Creek Metals and Selenium TMDL assigns a final mass-based wet-weather waste load allocations for copper, nickel, and selenium in pounds per day to “Permitted Stormwater Dischargers (PSDs)” to be met in the water column of Calleguas Creek or Revolon Slough. The waste load allocation for copper, nickel, and selenium are shown in Table 48 below.

Table 48 – Calleguas Creek, Conejo Creek, and Revolon Slough Interim WetWeather Waste Load Allocations Pollutant
Waste Load Allocation for
Calleguas Creek and Conejo
Creek (lbs/d)
Waste Load Allocation for
Revolon Slough (lbs/d)
Copper* (0.00054*Q^2*0.032*Q – 0.17)*WER
– 0.06 (0.0002*Q2+0.0005*Q)*WER
Nickel** 0.014*Q^2+0.82*Q 0.027*Q^2+0.47*Q
Selenium** (a) 0.027*Q^2+0.47*Q
*The approved site-specific WER of 1.51 for Mugu Lagoon is used to calculate the assigned waste load allocations for discharges to Calleguas and Conejo Creek to ensure the downstream standard is achieved. Permitted stormwater dischargers may apply a WER of up to 3.69 for discharges to upstream reaches, with the exception of Reaches 4 and 5, to calculate the assigned waste load allocations. If a WER of greater than 1.51 is applied, permitted stormwater dischargers shall be required to provide detailed quantitative analysis to demonstrate that the waste load allocations as modified by the WER are protective of downstream reaches. No site specific WER for Revolon Slough was approved so default WER value of 1 is applied. Regardless of the final WERs, total copper loading shall not exceed current loading. **Current loads do not exceed loading capacity during wet weather. Sum of all loads cannot exceed loads presented in the table. Q: Daily storm volume (cfs). (a) Selenium allocations have not been developed for this reach as it is not on the 303(d) list.

Directly implementing the final copper, nickel, and selenium waste load allocations will result in a unique mass load for each Responsible Discharger dependent on the daily stormwater flows and area of construction site. Requiring Responsible Dischargers to calculate the construction site’s specific mass loading of a pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most metal loadings in this watershed are in particulate form and associated with wet-weather flows. Therefore, the following will address this TMDL:

Page 740 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-196
a) Comply with the site-specific erosion and sediment control, and post-construction requirements in this General Permit.
b) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as pre-construction (e.g., undisturbed vegetation for the area) conditions. Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.
4) Wet-weather Interim Limits and Final Waste Load Allocations for Mercury
The Calleguas Creek Metals and Selenium TMDL assigns massbased interim and final waste load allocations for mercury pounds per year (lbs/yr) to “Permitted Stormwater Dischargers (PSDs)” to be met at the receiving water. The waste load allocations for mercury are shown in Table 49 below.

Table 49 – Interim Limits and Final Waste Load Allocations for Mercury in Suspended Sediment for Calleguas Creek and Revolon Slough Flow Range
Calleguas
Creek Interim
(lb/yr)
Calleguas
Creek Final
(lb/yr)
Revolon
Slough
Interim (lb/yr)
Revolon
Slough Final
(lb/yr)
0-15,000
Million Gallons
per Year

3.3 0.4 1.7 0.1
15,000-25,000
Million Gallons
per Year

10.5 1.6 4 0.7
Above 25,000
Million Gallons
per Year

64.6 9.3 10.2 1.8
Directly implementing the copper and nickel waste load allocations will result in a unique mass load for each Responsible Discharger dependent on the range of stormwater flows and area of
construction site. Requiring Responsible Dischargers to calculate the construction site’s specific mass loading of a pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most metal loadings in this watershed are in particulate form and associated with wet-weather flows. Therefore, the following will address this TMDL:
a) Comply with the site-specific erosion and sediment control, and post-construction requirements in this General Permit.

Page 741 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-197
b) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as pre-construction (e.g., undisturbed vegetation for the area) conditions. Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.
· Compliance Actions and Schedule
The TMDL’s interim compliance deadline was March 27, 2007. Since this compliance deadline has passed, the interim waste load allocations shall be met by the effective date of this General Permit.

Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers shall compare all non-visible sampling and analytical results to the numeric action level for copper. If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the waste load allocations in the future. Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to copper, nickel, selenium, and mercury sources are expected to meet the assigned waste load allocations.

The TMDL’s final compliance deadline was March 27, 2022. Since this compliance deadline has passed, the Responsible Dischargers shall comply with the erosion and sediment control requirements of this General Permit and RUSLE2 modeling requirements in Attachment H, Section I.G.2, upon the effective date of this General Permit. iv. Calleguas Creek OC Pesticide and PCBs TMDL264
The Los Angeles Regional Water Quality Control Board adopted the Calleguas Creek OC Pesticide and PCBs TMDL on June 9, 2006, to address the impairment of Calleguas Creek Watershed due to organochlorine (OC) pesticides and polychlorinated biphenyls (PCBs).

Eleven of fourteen reaches in the watershed are identified as impaired for these toxic pollutants on the 2002 303(d) list.
264 Los Angeles Regional Water Quality Control Board, Total Maximum Daily Loads (TMDLs) for Organochlorine (OC) Pesticides, Polychlorinated Biphenyls (PCBs) and Siltation in Calleguas Creek, its Tributaries, and Mugu Lagoon (July 7, 2005), <https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/2005- 010_RB_BPA.pdf> [as of May 20, 2021] (Calleguas Creek OC Pesticides and PCBs TMDL)

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-198
· Source Analysis
The largest sources of OC pesticides and PCBs in the watershed were estimated to be agricultural runoff and residues from past uses, respectively. Urban runoff is considered a minor source of OC pesticides and PCBs. Both impairing contaminants are known to bind to sediments and fine particles, which are transported to the watershed through runoff and erosion.
· Waste Load Allocation Translation
The Calleguas Creek OC Pesticide and PCBs TMDL assigns interim and final waste load allocations for pollutants in sediment for stormwater permittees, shown in Table 50 and Table 51 below. Although not specifically identified in the TMDL, waste load allocations were interpreted as applicable to construction stormwater dischargers due to the sediment and erosion intensive activities associated with construction. Therefore, construction stormwater dischargers are considered Responsible Dischargers for the Calleguas Creek OC Pesticide and PCBs TMDL.

Table 50 – Interim Sediment Waste Load Allocations (ng/g) for Stormwater Permittees
Constituent Mugu
Lagoon*
Calleguas
Creek
Revolon
Slough
Arroyo
Las
Posas
Arroyo
Simi
Conejo
Creek
Chlordane 3.3 3.3 0.9 3.3 3.3 3.3
4,4-DDD 2.0 2.0 2.0 2.0 2.0 2.0
4,4-DDE 2.2 1.4 1.4 1.4 1.4 1.4
4,4-DDT 0.3 0.3 0.3 0.3 0.3 0.3
Dieldrin 4.3 0.2 0.1 0.2 0.2 0.2
PCBs 180.0 120.0 130.0 120.0 120.0 120.0
Toxaphene 360.0 0.6 1.0 0.6 0.6 0.6
* Mugu Lagoon subwatershed includes Duck Pond/Agricultural Drain/Mugu/Oxnard Drain #2

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ORDER WQ 2022-0057-DWQ
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FACT SHEET FS-199
Table 51 – Final Sediment Waste Load Allocations (ng/g) for Stormwater Permittees
Constituent Mugu
Lagoon*
Calleguas
Creek
Revolon
Slough
Arroyo
Las
Posas
Arroyo
Simi
Conejo
Creek
Chlordane 3.3 3.3 0.9 3.3 3.3 3.3
4,4-DDD 2.0 2.0 2.0 2.0 2.0 2.0
4,4-DDE 2.2 1.4 1.4 1.4 1.4 1.4
4,4-DDT 0.3 0.3 0.3 0.3 0.3 0.3
Dieldrin 4.3 0.2 0.1 0.2 0.2 0.2
PCBs 180.0 120.0 130.0 120.0 120.0 120.0
Toxaphene 360.0 0.6 1.0 0.6 0.6 0.6
* Mugu Lagoon subwatershed includes Duck Pond/Agricultural Drain/Mugu/Oxnard Drain #2
Compliance with the sediment-based waste load allocations is measured as an in-stream annual average at the base of each subwatershed where the dischargers are located. Requiring Responsible Dischargers to sample for the pollutant(s) within the receiving waters would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, OC pesticide and PCB loading are associated with sediment and fine particles transported by runoff. Therefore, the following will address this TMDL:
1) Comply with the site-specific erosion and sediment control, and postconstruction requirements in this General Permit. 2) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as preconstruction (e.g., undisturbed vegetation for the area) conditions.

Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of organochlorine compounds associated with the impaired water body, through the required pollutant source assessment, are to implement BMPs specific to preventing or controlling stormwater exposure to the organochlorine compounds. Furthermore, Responsible Dischargers are to comply with the RUSLE 2 modeling requirements in Attachment H, Section I.G.2.

The Calleguas Creek OC Pesticide and PCBs TMDL’s interim compliance deadline for the TMDLs was March 26, 2007. Since the deadline has already passed, Responsible Dischargers shall comply with

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-200
the interim waste load allocations through the requirements of this General Permit and the RUSLE2 modeling requirements in Attachment H, Section I.G.2, upon the effective date of this General Permit.

Compliance with the final waste load allocations shall be achieved by March 26, 2027.
v. Colorado Lagoon Toxics TMDL265
The Los Angeles Regional Water Quality Control Board adopted the Colorado Lagoon Toxics TMDL on October 1, 2009, to address the impairment of Colorado Lagoon due to metals, organochlorine (OC) pesticides (chlordane, DDT, and dieldrin), polyaromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and sediment toxicity. · Source and Linkage Analysis
The Colorado Lagoon watershed is divided into five sub-basins that discharge stormwater and urban dry weather runoff to Colorado Lagoon.266 The impairing contaminants in sediment are associated with fine-grained particles that are primarily delivered to the sediments through suspended solids in stormwater and urban runoff.267 Therefore, construction sites covered under this General Permit are considered Responsible Dischargers for the Colorado Lagoon Toxics TMDL. · Waste Load Allocation Translation
The Colorado Lagoon Toxics TMDL assigns concentration-based waste load allocations for lead, zinc, OC pesticides, PAHs, and PCBs to be met at the construction site’s discharge point(s) for discharges into Colorado Lagoon.268 The waste load allocations are shown in Table 52 below. 265 Los Angeles Regional Water Quality Control Board, Total Maximum Daily Load for Organochlorine (OC) Pesticides, Polychlorinated Biphenyls (PCBs), Sediment Toxicity, Polycyclic Aromatic Hydrocarbons (PAHs), and Metals for Colorado Lagoon (October 1, 2009),
<https://www.waterboards.ca.gov/water_issues/programs/tmdl/docs/coloradolagoonto xicity/signedresolutionr09_005_amendments.pdf> [as of April 29, 2022] (Colorado Lagoon Toxics TMDL)
266 Colorado Lagoon Toxics TMDL, p. 3.
267 Colorado Lagoon Toxics TMDL, p. 4.
268 Colorado Lagoon Toxics TMDL, p. 5, 10.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-201
Table 52 – Colorado Lagoon Waste Load Allocations
Pollutants Waste Load Allocation Suspended SedimentAssociated Contaminants (ug/dry kg) Chlordane 0.50
Dieldrin 0.02
Lead 46,700.00
Zinc 150,000.00
PAHs 4,022.00
PCBs 22.70
DDT 1.58
Requiring Responsible Dischargers to sample for the pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most metal loadings in this watershed are in particulate form and associated with wet-weather flows. Therefore, the following will address this TMDL:
1) Comply with the site-specific erosion and sediment control, and postconstruction requirements in this General Permit. 2) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as preconstruction (e.g., undisturbed vegetation for the area) conditions.

Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of the toxic pollutants associated with the impaired water body, through the required pollutant source assessment, are to implement BMPs specific to preventing or controlling stormwater exposure to the organochlorine compounds. Furthermore, Responsible Dischargers are to comply with the RUSLE2 modeling requirements in Attachment H, Section I.G.2.

The final compliance deadline for the Colorado Lagoon Toxics TMDL was July 28, 2018. Since the deadline has already passed, Responsible Dischargers shall comply with the waste load allocations through the requirements of this General Permit and the RUSLE2 modeling requirements in Attachment H, Section I.G.2, upon the effective date of this General Permit.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-202
vi. Los Angeles Area Lakes Waters Toxics TMDL269
The U.S. EPA adopted the Los Angeles Area Lakes Toxics TMDL on March 26, 2012, to address the impairment in three of the nine assessed lakes in the Los Angeles Region due to organochlorine (OC) pesticides (chlordane, dieldrin, DDT) and polychlorinated biphenyls (PCBs). The three identified lakes for OC pesticides and PCBs impairments are Peck Road Park Lake, Echo Park Lake, and Puddingstone Reservoir. Peck Road Park Lake and Echo Park Lake are located in the Los Angeles River watershed.

Puddingstone Reservoir is located in the San Gabriel River watershed. · Source Analysis
The manufacturing and use of OC pesticides and PCBs are currently banned and no additional allowances for new sources of discharges are expected in the Los Angeles Area Lakes Toxics TMDL. Source control BMPs and pollutant removal are the most suitable courses of action to reduce OC pesticides and PCBs. The TMDL identified many historic and current loadings of pollutants into Peck Road Park Lake, Echo Park Lake, and Puddingstone Reservoir including construction sites that would be covered under this General Permit. Therefore, construction stormwater dischargers are considered Responsible Dischargers for the Los Angeles Area Lakes Toxics TMDL.
· Waste Load Allocation Translation
The Los Angeles Area Lakes TMDL assigns concentration-based waste load allocations for OC pesticides and PCBs in the water column to be met at the construction site’s discharge location(s) into Peck Road Park Lake, Echo Park Lake, and Puddingstone Reservoir, summarized in Table 53 through Table 55 below.

Table 53 – Peck Road Park Lake Toxics Waste Load Allocation Pollutant Waste Load Allocation – Water Column
(mg/L)
Chlordane 5.9 X 10-7
Dieldrin 1.4 X 10-7
Total DDTs 5.9 X 10-7
Total PCBs 1.7 X 10-7
269 Los Angeles Regional Water Quality Control Board, Los Angeles Area Lakes Waters Toxics TMDL (May 2011)
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/Established /Lakes/LALakesTMDLsEntireDocument.pdf> [as of April 28, 2022] (Los Angeles and Long Beach Harbor Water TMDL)

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-203
Table 54 – Echo Park Lake Toxics Waste Load Allocation
Pollutant Waste Load Allocation – Water Column
(mg/L)
Chlordane 5.9 X 10-7
Dieldrin 1.4 X 10-7
Total PCBs 1.7 X 10-7
Table 55 – Puddingstone Reservoir Toxics Waste Load Allocation Pollutant Waste Load Allocation – Water Column
(mg/L)
Chlordane 5.7 X 10-7
Dieldrin 1.4 X 10-7
Total DDTs 5.9 X 10-7
Total PCBs 1.7 X 10-7
The May 2021 draft of the Construction Stormwater General Permit reissuance proposed a translation of the waste load allocations into numeric effluent limitations. However, the translated numeric effluent limitations for chlordane, DDT, dieldrin, and PCBs in the Los Angeles Area Lakes Toxics TMDL were below the respective reporting limits for the constituents and would render determining compliance at the point of discharge infeasible.

Dischargers that discharge to the applicable Los Angeles Area Lakes waterbodies are to conduct a soil screening investigation for chlordane, DDT, dieldrin, and PCBs (as applicable) as part of the pollutant source assessment to determine whether they are Responsible Dischargers per Attachment H, Section I.G.5. Dischargers are considered Responsible Dischargers if the TMDL analytes are measured above their respective reporting limits and will be required to comply with a numeric effluent limitation of 100 mg/L total suspended solids (TSS) as the applicable limitation for each of the applicable TMDL-pollutants identified through the soil screening investigation.

State Water Board staff reviewed literature270 and concluded that measurements of total suspended solids at the point of discharge, 270 Nasrabadi T, Ruegner H, Schwientek M, Bennett J, Fazel Valipour S, Grathwohl P (2018) “Bulk metal concentrations versus total suspended solids in rivers: Timeinvariant & catchment-specific relationships.”; Washington Department of Ecology (2004) “A Total Maximum Daily Load Evaluation for Chlorinated Pesticides and PCBs in the Walla Walla River.”; Angela Gorgoglione, Fabián A. Bombardelli, Bruno J. L. Pitton, Lorence R. Oki, Darren L. Haver and Thomas M. Young (2018) “Role of Sediments in Insecticide Runoff from Urban Surfaces: Analysis and Modeling.”

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-204
following a non-visible pollutant monitoring trigger, are the most reasonable way to assess presence of chlordane, DDT, dieldrin, and PCBs, as these organic pollutants are readily sorbed to sediment.

The measurement of total suspended solids at or above of 100 mg/L is an appropriate indicator of the presence of chlordane, DDT, dieldrin, and PCBs in runoff, if the pre-project soil analysis (described in Attachment H, Section I.G.5) demonstrated these pollutants are present in the soil.

There is a strong positive correlation between total suspended solids and chlordane, DDT, dieldrin, and PCBs, indicating that concentrations of pollutants increase and decline proportionally with the TSS concentrations. If the constituents were measured in the soil at or above the reporting limit, a small fraction will be in the TSS sample as well. · Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of toxic pollutants associated with the impaired water bodies, through the required pollutant source assessment, are to implement BMPs specific to preventing or controlling stormwater exposure to the metals.

Furthermore, the Responsible Discharger shall compare all non-visible sampling and analytical results to the TSS numeric effluent limitation to address toxic pollutants associated with the impairment of the water body. Exceedances of the TSS numeric effluent limitation equates to an exceedance of each applicable TMDL-specific pollutant identified in the soil screening investigation.

The Los Angeles Regional Water Quality Control Board has not adopted an Implementation Plan or a compliance schedule for the toxic pollutants addressed by the Los Angeles Area Lakes Toxics TMDL. Therefore, Responsible Dischargers are required to achieve compliance with the TSS numeric effluent limitation by the effective date of this General Permit.
vii. Los Angeles and Long Beach Harbor Waters TMDL271
The Los Angeles Regional Water Quality Control Board adopted the Los Angeles and Long Beach Harbor Waters TMDL on May 5, 2011, to address 271 Los Angeles Regional Water Quality Control Board, Total Maximum Daily Load for Toxic Pollutants in Dominguez Channel and Greater Los Angeles and Long Beach Harbor Waters (May 2011)
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/R11- 008_RB_BPA.pdf> [as of May 20, 2021] (Los Angeles and Long Beach Harbor Waters TMDL)

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-205
the impairment and affected benthic communities of the Dominguez Channel, Greater Los Angeles, and Long Beach Harbor Waters due to cadmium, certain polyaromatic hydrocarbon (PAH) compounds, chlordane, chromium, copper, DDT, dieldrin, lead, mercury, polychlorinated biphenyls (PCBs), toxaphene, toxicity, and zinc.
· Source Analysis
Chromium, copper, lead, mercury, PAHs, and zinc are currently deposited into the watershed via urban runoff and then washed into storm drains and channels that discharge to the Dominguez Channel and Greater Harbor Waters. Organochlorine (OC) pesticides (chlordane, DDT, dieldrin) and PCBs are legacy pollutants and remain present in the environment. Urban runoff and rainfall mobilize OC pesticides, PAHs, and PCBs bound to fine-grained particles, which are then washed into storm drains and channels that discharge to the Dominguez Channel and Greater Harbor Waters. Runoff from construction sites covered under this General Permit has the potential to transport these toxic pollutants into the waters. Therefore, construction stormwater dischargers are considered Responsible Dischargers for the Los Angeles and Long Beach Harbor Waters Toxics TMDL.
· Waste Load Allocation Translation
1) Dominguez Channel and Torrance Lateral Freshwater Wet Weather Interim Waste Load Allocations
This TMDL assigns interim concentration-based waste load allocations for copper, lead, and zinc to Responsible Dischargers to be met at the construction site’s discharge location(s) for discharges into the Dominguez Channel or Torrance Lateral. The interim concentration-based waste load allocations will be translated to numeric action levels as an interim target for Responsible Dischargers until the final waste load allocations apply. The compliance deadline of the interim waste load allocations is upon effective date of the TMDL and therefore, apply at that time. The interim numeric action levels are shown in Table 56 below.

Table 56 – Dominguez Channel and Torrance Lateral Interim Waste Load Allocation Translation
Pollutant Waste Load Allocation
(ug/L)
Interim Numeric Action Level
(mg/L)
Total Copper 207.51 0.20751
Total Lead 122.88 0.12288
Total Zinc 898.87 0.89887

Page 750 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-206
2) Dominguez Channel and Torrance Lateral Wet-Weather Final Waste Load Allocations
This TMDL assigns wet-weather final concentration-based waste load allocations for copper, lead, and zinc to Responsible Dischargers to be met at the construction site’s discharge location(s) for discharges into the Dominguez Channel (above Vermont Avenue).

Exxon Mobil Torrance Refinery and “all other dischargers” are assigned concentration-based waste load allocations of copper, lead, and zinc equal to the sediment targets to be met at the construction site’s discharge location(s) for discharges into the Dominguez Channel and Torrance Lateral, shown in Table 57 below.

Responsible Dischargers are assumed to be included in the “all other dischargers” definition. The concentration-based waste load allocations are translated into numeric effluent limitations. However, the numeric effluent limitations are not immediately effective because the compliance deadline for attaining the waste load allocation for dischargers into Dominguez Channel and Torrance Lateral is beyond this General Permit’s term.

Table 57 – Dominguez Channel and Torrance Lateral Final Waste Load Allocation Pollutant Waste Load Allocation* (mg/L)
Total Copper 0.0097
Total Lead 0.0427
Total Zinc 0.0697
*Hardness used = 50 mg/L. Recalculated concentration-based allocations using ambient hardness at the time of sampling are considered consistent with the assumptions and requirements of these waste load allocations. In addition to the waste load allocations above, samples collected during flow conditions less than the 90th percentile of annual flow rates must demonstrate that the acute and chronic hardness dependent water quality criteria provided in the CTR are achieved.

The May 2021 draft of the Construction Stormwater General Permit reissuance proposed a translation for the final total copper, lead, and zinc waste load allocations into numeric effluent limitations as the waste load allocations were concentration-based and assigned at the point of discharge. However, this General Permit incorporates a soil screening investigation and a total suspended solids numeric effluent limitation to assess compliance with the final waste load allocations for total copper, lead, and zinc.

Starting at the effective date of the final waste load allocations, March 23, 2032, dischargers that discharge to the Dominguez Channel and Torrance Lateral are to conduct a soil screening investigation for

Page 751 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-207
copper, lead, and zinc as part of the pollutant source assessment to determine whether they are Responsible Dischargers per Attachment H Section I.G.5. Dischargers are considered Responsible Dischargers if the TMDL analytes are measured above the analytical reporting limit and will be required to comply with a numeric effluent limitation of 100 mg/L total suspended solids (TSS) as the applicable limitation for each of the applicable TMDL-pollutants identified through the soil screening investigation, instead of the numeric effluent limitations for total copper, lead, and zinc.

State Water Board staff reviewed literature272 and concluded that measurements of TSS at the point of discharge, following a nonvisible pollutant monitoring trigger, are the most reasonable way to assess the presence of copper, lead, and zinc, as these metals are a readily sorbed to sediment, which is the most common pollutant discharged from construction sites and can be managed effectively with BMPs.

Staff determined the measurement of TSS at or above 100 mg/L is an appropriate indicator of the presence of copper, lead, and zinc in runoff, if the pre-project soil monitoring (described in Attachment H, Section I.G.5) demonstrated these pollutants are present in the soil.

There is a strong positive correlation between TSS and metals, indicating that concentrations of pollutants increase and decline proportionally with the TSS concentrations. If the constituents were measured in the soil at or above the analytical reporting limit, a small faction will be in the TSS sample as well.
3) Dominguez Channel Estuary and Greater Los Angeles and Long Beach Harbor Waters Interim Sediment Waste Load Allocations This TMDL assigns concentration-based interim sediment waste load allocations for copper, lead, zinc, DDT, PAHs, and PCBs to Responsible Dischargers for discharges into the Dominguez Channel Estuary and Greater Harbor Waters, shown in Table 58 below. 272 Nasrabadi T, Ruegner H, Schwientek M, Bennett J, Fazel Vailpour S, Grathwohl P (2018) “Bulk metal concentrations versus total suspended solids in rivers: Timeinvariant & catchment-specific relationships.”

Page 752 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-208
Table 58 – Dominguez Channel Estuary and Greater Harbor Waters Interim Sediment Waste Load Allocations in mg/kg sediment
Water Body Copper Lead Zinc DDT PAHs PCBs
Dominguez Channel
Estuary 220.0 510.0 789.0 1.727 31.60 1.490
Long Beach Inner Harbor 142.3 50.4 240.6 0.070 4.58 0.060 Los Angeles Inner Harbor 154.1 145.5 362.0 0.341 90.30 2.107 Long Beach Outer Harbor
(inside breakwater) 67.3 *46.7 150 0.075 *4.022 0.248
Los Angeles Outer Harbor
(inside breakwater) 104.1 *46.7 150 0.097 *4.022 0.310
Los Angeles River Estuary 53.0 *46.7 183.5 0.254 4.36 0.683 San Pedro Bay
Near/Offshore Zones 76.9 66.6 263.1 0.057 *4.022 0.193
Los Angeles Harbor –
Cabrillo Marina 367.6 72.6 281.8 0.186 36.12 0.199
Los Angeles Harbor –
Consolidated Slip 1470.0 1100.0 17050 1.724 386.00 1.920 Los Angeles Harbor –
Inner Cabrillo Beach 129.7 *46.7 163.1 0.145 *4.022 0.033 Fish Harbor 558.6 116.5 430.5 40.5 2102.7 36.6
*Values are also the final allocation
Directly implementing the final waste load allocations would be impractical, costly, and not aligned with the monitoring requirements in this General Permit. As mentioned above, this TMDL associates bed toxicity with discharges of metals, OC pesticides, PAHs, and PCBs bound to sediment particulates. Therefore, the following will address this TMDL:
a) Comply with the site-specific erosion and sediment control, and post-construction requirements in this General Permit.
b) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as pre-construction (e.g., undisturbed vegetation for the area) conditions. Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.
4) Dominguez Channel Estuary and Greater Harbor Waters Final Water-Column Waste Load Allocations
This TMDL assigns concentration-based final waste load allocations for the metals and organic compounds identified in Table 57 and Table 58 below. The waste load allocations are to be met in the water column for discharges to Dominguez Channel Estuary and the Greater Harbor Waters. Greater Harbor Waters include Inner and

Page 753 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-209
Outer Harbor, Main Channel, Consolidated Slip, Southwest Slip, Fish Harbor, Cabrillo Marina, Inner Cabrillo Beach, Los Angeles River Estuary, and San Pedro Bay. The concentration-based waste load allocations are translated to numeric action levels because the waste load allocations are assigned to be met in the receiving waters and not at the point of discharge. The assigned waste load allocations of copper, lead, and zinc are based on the Criteria Chronic Concentration, and are inappropriate to assign to stormwater discharges. Therefore, the California Toxics Rule (CTR) Criterion Maximum (acute) Concentration is applied to Responsible Dischargers. The units are converted from ug/L to mg/L to be consistent with the reporting units in SMARTS. The numeric action levels assigned to Responsible Dischargers are shown in Table 59 and Table 60 below.

Table 59 – Dominguez Channel Estuary Final Water Column Waste Load Allocation Translations
Pollutant
Waste
Load
Allocation
(ug/L)
Dissolved Saltwater
Criterion Maximum
Concentration
(ug/L)
Total Saltwater
Criterion Maximum
Concentration
(ug/L)
Numeric
Action Level
(mg/L)
4,4-DDT 0.00059 5.9 X10-7
Chlordane 0.00059 5.9 X10-7
Dieldrin 0.00014 1.4 X10-7
Total Copper 3.73 4.8 5.8** 0.0058
Total Lead 8.53 210 221** 0.221
PAHs 0.049 4.9 X10-5
Total PCBs 0.00017 1.7 X10-7
Total Zinc 85.6 90 95** 0.095
* CTR human health criteria were not established for total PAHs. Therefore, the CTR criterion for individual PAHs of 0.049 μg/L is applied individually to benzo(a)anthracene, benzo(a)pyrene, and chrysene. The CTR criterion for Pyrene of 11,000 μg/L is assigned as an individual waste load allocation to Pyrene. Other PAH compounds in the CTR shall be screened as part of the TMDL monitoring.
**Values were rounded to match Criterion significant figures.

Table 60 – Greater Harbor Final Water Column Waste Load Allocation Translations
Pollutant
Waste
Load
Allocation
(ug/L)
Dissolved Saltwater
Criterion Maximum
Concentration
(ug/L)
Total Saltwater
Criterion Maximum
Concentration
(ug/L)
Numeric
Action Level
(mg/L)
4,4-DDT 0.00059 5.9 X10-7
Total Copper 3.73 4.8 5.8** 0.0058

Page 754 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-210
Pollutant
Waste
Load
Allocation
(ug/L)
Dissolved Saltwater
Criterion Maximum
Concentration
(ug/L)
Total Saltwater
Criterion Maximum
Concentration
(ug/L)
Numeric
Action Level
(mg/L)
Total Lead 8.53 210 221** 0.221
Total PCBs 0.00017 1.7 X10-7
Total Zinc 85.6 90 95** 0.095
**Values were rounded to match Criterion significant figures. 5) Dominguez Chanel Estuary, Consolidated Slip, and Fish Harbor Final Sediment Waste Load Allocations
This TMDL assigns concentration-based final sediment waste load allocations for cadmium, chromium, and mercury to be met at the construction site’s discharge point(s) for discharges into Consolidated Slip and Fish Harbor, cadmium discharges into Dominguez Channel Estuary and Consolidated Slip, and chromium discharges into Consolidated Slip.

Table 61 – Dominguez Channel Estuary, Consolidated Slip and Fish Harbor Final Sediment Waste Load Allocations
Pollutant Waste Load Allocation (mg/kg sediment)
Cadmium* 1.2
Chromium** 81
Mercury*** 0.15
* Applies to Dominguez Channel Estuary and Consolidated Slip ** Applies to Consolidated Slip
*** Applies to Consolidated Slip and Fish Harbor
Directly implementing the final waste load allocations would be impractical, costly, and not aligned with the monitoring requirements in this General Permit. As mentioned above, this TMDL associates bed toxicity with discharges of metals bound to sediment particulates.

Therefore, the following will address this TMDL:
a) Comply with the site-specific erosion and sediment control, and post-construction requirements in this General Permit.
b) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as pre-construction (e.g., undisturbed vegetation for the area) conditions. Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that discharge into the

Page 755 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-211
Dominguez Channel or the Torrance Lateral, and identify on-site sources of copper, lead, and zinc through the required pollutant source assessment, shall compare all non-visible sampling and analytical results to the applicable interim numeric action levels for the metals.

Responsible Dischargers that discharge into the Dominguez Channel Estuary or the Greater Harbor waters, and that identify on-site sources of the metals and toxic pollutants listed in Table 60 and Table 61 are to implement BMPs specific to preventing or controlling stormwater contact with those metals and toxic pollutants. Furthermore, Responsible Dischargers are to comply with the RUSLE2 modeling requirements in Attachment H, Section I.G.2, in order to address applicable interim sediment-based waste load allocations.

If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the interim numeric action levels and TSS numeric effluent limitations in the future. Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to the metals and toxic pollutant sources are expected to meet the assigned numeric action levels and TSS numeric effluent limitations.

The effective date of the TMDL, March 23, 2012, is the interim compliance deadline. Since this compliance deadline has passed, the requirements to meet the interim numeric action levels shall be met by the effective date of this General Permit. Responsible Dischargers are to comply with the final numeric action levels and TSS numeric effluent limitations by March 23, 2032, the final compliance deadline for the Los Angeles and Long Beach Harbor. Future reissuances of this General Permit may incorporate additional or revised compliance requirements or interim targets to progress towards the required final compliance when a final numeric action level or TSS numeric effluent limitation applies.
viii. Los Angeles River Metals TMDL273
The Los Angeles Regional Water Quality Control Board adopted the Los Angeles River Metals TMDL on April 9, 2015, to address the impairment of 273 Los Angeles Regional Water Quality Control Board, Amendment to the Water Quality Control Plan for the Los Angeles Region to Revise the Los Angeles River and Tributaries Metals TMDL (April 2015)
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/R15- 004_BPA_CH_7.pdf> [as of May 20, 2021] (Los Angeles River Metals TMDL)

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-212
Los Angeles River and its tributaries due to cadmium, copper, lead, selenium, and zinc.
· Source Analysis
Dry weather loading from storm drains contributes a large percentage of the loading because of low flows but high concentration of dissolved metals. During wet weather most metals loadings are in the particulate form where stormwater flows contribute a large percentage of cadmium, copper, lead, and zinc loading. Studies are underway to evaluate whether selenium levels represent a “natural condition” for this watershed.274
· Waste Load Allocation Translation
1) Dry-weather Waste Load Allocations
The Los Angeles River Metals TMDL assigns concentration-based waste load allocations for dry-weather. Non-Stormwater Discharges (NSWDs) are only authorized in this General Permit if the terms and conditions in Order, Section IV.A are met to control the discharge of pollutants from the construction site. Order, Section IV.B prohibits all NSWDs not authorized under Order, Section IV.A; therefore, all unauthorized NSWDs must be either eliminated or have regulatory coverage under a separate NPDES permit. Authorized NSWDs, as defined in this General Permit, are authorized because these discharges do not commingle with stormwater associated with construction activity. The Regional Water Board may impose additional requirements on NSWDs if deemed necessary per sitespecific analysis. 2) Wet-weather Waste Load Allocations
The Los Angeles River Metals TMDL assigns a mass-based waste load allocation per construction area in grams per day per acre (g/d/ac) for cadmium, copper, lead, and zinc at the construction site’s discharge point(s) for discharges into the Los Angeles River or tributaries (Los Angeles River Watershed).275 In addition, daily storm volume flows are required to calculate the waste load allocation for each metal. The waste load allocations are shown in Table 62 below.

Directly implementing the copper, lead, and zinc waste load allocations would result in a unique mass load for each Responsible Discharger depended on the daily stormwater flows and the 274 Los Angeles River Metals TMDL, p. 4.
275 Los Angeles River Metals TMDL, p. 13.

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FACT SHEET FS-213
construction site’s acreage. Requiring Responsible Dischargers to calculate the site-specific mass load of a pollutant would be impractical, costly, and not aligned with the monitoring requirements in this General Permit.

The Los Angeles River Metals TMDL Staff Report allows for compliance to be assessed based on concentration. Additionally, the TMDL Staff Report states, “the wet-weather mass-based waste load allocations for the general construction and industrial stormwater permittees (Table 6-12) will be incorporated into watershed specific general permits. Concentration-based permit conditions may be set to achieve the mass-based waste load allocations. These concentration-based conditions would be equal to the concentrationbased waste load allocations assigned to the other NPDES permits.” This TMDL states “each general construction stormwater permit holder will be subject to site-specific BMPs and monitoring requirements to demonstrate compliance with the final waste load allocations.”276 Therefore, it is consistent with the requirements and assumptions of the waste load allocation to apply the Los Angeles River Metals TMDL Numeric Targets as concentration-based numeric action levels (permit conditions).

The numeric action level iterative process in this General Permit requires dischargers to implement and evaluate performance of sitespecific BMPs to demonstrate compliance with applicable waste load allocations. The units are converted from ug/L to mg/L to be consistent with the reporting units in SMARTS. The translated numeric action levels are shown in Table 62 below and a WER of

3.97 is used for copper.
276 Los Angeles River Metals TMDL, p. 23.

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FACT SHEET FS-214
Table 62 – Los Angeles River Waste Load Allocations Translation for Total Recoverable Metals
Pollutant Waste Load Allocation
(g/d/ac)
Numeric Target
(ug/L)
Numeric Action Level
(mg/L)
Cadmium* WER x (7.6 x 10-12) x daily
volume (L) – (4.8 x 10-6)
WER x 3.1 0.0031
Copper** WER x (4.2 x 10-11) x daily
volume (L) – (2.6 x 10-5)
WER x 17 0.06749
Lead* WER x (4.2 x 10-11) x daily
volume (L) – (8.7 x 10-5)
WER x 94 0.094
Zinc* WER x (3.9 x 10-10) x daily
volume (L) – (2.2 x 10-4)
WER x 159 0.159
* WER(s) have a default value of 1.0 unless site-specific WER(s) are approved. **The WER for this constituent is 3.97.
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that discharge into the Los Angeles River or its tributaries, and that identify on-site sources of cadmium, copper, lead, and/or zinc through the required pollutant source assessment, shall compare all non-visible sampling and analytical results to the applicable numeric action levels for the identified metals.

Responsible Dischargers shall install, operate, and maintain site-specific BMPs to address identified on-site sources of cadmium, copper, lead, and/or zinc.

If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the numeric action levels in the future. Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to the sources of metals are expected to meet the numeric action levels.

The final compliance deadline for the Los Angeles River Metals TMDL was January 11, 2016. Since this compliance deadline has passed, the numeric action levels are applicable upon the effective date of this General Permit.

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FACT SHEET FS-215
ix. Los Cerritos Channel Metals TMDL277
The U.S. EPA adopted the Los Cerritos Metals TMDL on March 17, 2010, to address the impairment of Los Cerritos Channel due to copper, lead, and zinc.
· Source Analysis
Sources of metals from construction sites include sediment-bound metals, construction materials, and equipment used on construction sites. Additionally, in highly urbanized Los Cerritos Channel freshwater watershed, re-development of former industrial sites has a higher potential to discharge sediments laden with metals. During wet-weather, runoff from construction sites has the potential to contribute metals loadings to the Channel. Building materials and construction waste exposed to stormwater can leach and contribute metals to waterways.278 Therefore, construction sites covered under this General Permit are considered Responsible Dischargers for the Los Cerritos Channel Metals TMDL.
· Waste Load Allocation Translation
1) Dry-weather Waste Load Allocation
The Los Cerritos Channel Metals TMDL assigns a concentrationbased waste load allocation for dry-weather. Non-Stormwater Discharges (NSWDs) are authorized in this General Permit if Order, Section IV.A terms and conditions are met to control the discharge of pollutants from the construction site. Order, Section IV.B prohibits all NSWDs not authorized under Order, Section IV.A; therefore, all unauthorized NSWDs must be either eliminated or have regulatory coverage under a separate NPDES permit. Authorized NSWDs, as defined in this General Permit, are authorized because these discharges do not commingle with stormwater associated with construction activity. The Regional Water Board may impose additional requirements on NSWDs if deemed necessary per sitespecific analysis. 277 U.S. Environmental Protection Agency Region IX, Los Cerritos Channel Total Maximum Daily Loads for Metals (March 2010)
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/Established /Los%20Cerritos%20Channel%20Metals%20TMDL/03-18-10LosCerritosChannelmetalsTMDLs.pdf> [as of April 28, 2022] 278 Los Cerritos Channel Metals TMDL, p. 20.

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FACT SHEET FS-216
2) Wet-weather Waste Load Allocations
The Los Cerritos Channel Metals TMDL assigns a mass-based waste load allocation per construction area in grams per day per acre (g/day/ac) for copper, lead, and zinc for discharges into the Los Cerritos Channel. In addition, daily storm volume flows are required to calculate the waste load allocation for each metal. The massbased waste load allocations are shown in Table 63 below.

Table 63 – Los Cerritos Mass-based Waste Load Allocations Pollutant Waste Load Allocation (g/day/ac)
Copper 0.497 x 10-3 x daily volume(L)
Lead 2.835 x 10-3 x daily volume(L)
Zinc 4.860 x 10-3 x daily volume(L)
Directly implementing the copper, lead, and zinc mass-based waste load allocations would result in a unique mass load for each Responsible Discharger, dependent on the daily stormwater flows and the construction site’s acreage. Requiring Responsible Dischargers to calculate the site-specific mass loading of a pollutant(s) is impractical, costly, and not aligned with the monitoring requirements of this this General Permit. The Los Cerritos Channel TMDL Implementation Plan279 requires incorporation of the waste load allocations in this General Permit as wet-weather permit limitations expressed as event mean concentrations.

The term permit limitation in the TMDL implementation plan is defined as “a water-quality based effluent limitation or a receiving water limitation…permittees may demonstrate compliance with wetweather waste load allocations in any one of three ways. First, general industrial and construction storm water permittees may be deemed in compliance with permit limitations if they demonstrate that there are no exceedances of the permit limitations at their discharge points or outfalls. Second, general industrial and construction storm water permittees may be deemed in compliance with permit limitations if they demonstrate that there are no exceedances of the permit limitations in the receiving water at, or downstream of, the 279 Los Angeles Regional Water Quality Control Board, Amendment to the Water Quality Control Plan – Los Angeles Region to Incorporate the Implementation Plan for the Total Maximum Daily Loads for Metals in the Los Cerritos Channel <https://www.waterboards.ca.gov/losangeles/board_decisions/basin_plan_amendmen ts/technical_documents/99_New/Los%20Cerritos%20Metals%20implementation%20p lan%20and%20schedule%20BPA_rev%20053013.pdf> [as of April 28, 2022] (Los Cerritos Channel Metals TMDL Implementation Plan)

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ORDER WQ 2022-0057-DWQ
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FACT SHEET FS-217
permittee's outfalls. Third, if permittees provide a quantitative demonstration that control measures and best management practices (BMPs) will achieve wet-weather waste load allocations consistent with the schedule in Table 7-20.2, then compliance may be demonstrated by implementation of those control measures and BMPs, subject to Executive Officer approval.”280 The assigned massbased waste load allocations require site-specific calculations that are incompatible with the monitoring and reporting requirements in this General Permit. Therefore, it is consistent with the requirements and assumptions of the waste load allocations to implement the Los Cerritos Channel Metals TMDL Numeric Targets as concentrationbased numeric action levels to align the mass-based waste load allocations to the requirements in this General Permit. The TMDL implementation plan provided Responsible Dischargers the abovestated three options for demonstrating waste load allocation compliance. The option implemented in this General Order is to implement the TMDL-specific numeric action levels at the point of discharge for the Responsible Discharger’s construction site. The assigned concentration based numeric action levels are shown in Table 64 below. The units are converted from ug/L to mg/L to be consistent with the reporting units in SMARTS.

Table 64 – Los Cerritos Channel Waste Load Allocations (Concentration-based, Total Recoverable)
Pollutant Numeric Targets (ug/L) Numeric Action Levels (mg/L) Copper 9.8 0.0098
Lead 55.8 0.0558
Zinc 95.6 0.0956
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that discharge into the Los Cerritos Channel and that identify on-site sources of copper, lead, and zinc through the required pollutant source assessment, shall compare all non-visible sampling and analytical results to the applicable numeric action levels for the identified metals.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-218
Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to the metals’ sources are expected to meet the assigned numeric action levels.

The TMDL’s final compliance deadline was September 30, 2017. Since this compliance deadline has passed, the numeric action levels are applicable upon the effective date of this General Permit. x. Machado Lake Toxics TMDL281
The Los Angeles Regional Water Quality Control Board adopted the Machado Lake Toxics TMDL on September 2, 2010, to address the impairment of Machado Lake due to chemical group organochlorine (OC) pesticides (chlordane, DDT, dieldrin) and polychlorinated biphenyls (PCBs). · Source Analysis
The point sources of OC pesticides and PCBs into Machado Lake are stormwater and urban runoff discharges from the municipal separate storm sewer system (MS4), the California Department of Transportation, and general construction and industrial dischargers. Therefore, construction sites covered under this General Permit are considered Responsible Dischargers for the Machado Lake Toxics TMDL.

OC pesticides are no longer legally sold or used, but remain ubiquitous in the environment, bound to fine-grained particles. The chemicals are transported to new locations when these particles become waterborne.

The more recent small discharges of OC pesticides and PCBs to Machado Lake most likely come from the erosion of pollutant-laden sediment further up in the watershed. Urban runoff and rainfall higher in the watershed mobilize the particles, which are then washed into storm drains and channels that discharge to the lake. Stormwater and urban runoff discharges to Machado Lake occur through the Wilmington Drain, Project 77, and Project 510 subdrainage systems. The estimated contributions of OC pesticides and PCBs from point sources is much smaller than the estimated contribution from internal lake sediments.

However, a waste load allocation is assigned to ongoing point source discharges to the lake.
281 Los Angeles Regional Water Quality Control Board, Machado Lake Pesticides and PCBs TMDL (September 2, 2010),
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/R10- 008_RB_BPA.pdf> [as of May 20, 2021] (Machado Lake Toxics TMDL)

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-219
· Waste Load Allocation Translation
The Machado Lake Toxics TMDL assigns a suspended sediment concentration-based waste load allocations for OC pesticides and PCBs to be met at the construction site’s discharge location(s) for discharges into Machado Lake, shown in Table 65 below.

Table 65 – Machado Lake Toxics Waste Load Allocations
Pollutant Waste Load Allocation of Suspended SedimentAssociated Contaminants (ug/kg dry weight) Chlordane 3.24
DDD (all congeners) 4.88
DDE (all congeners) 3.16
DDT (all congeners) 4.16
Dieldrin 1.9
Total DDTs 5.28
Total PCBs 59.8
Requiring Responsible Dischargers to directly implement the waste load allocation and sample for the pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most toxic pollutants loadings in this watershed are in particulate form and associated with wet-weather flows. Therefore, the following will address this TMDL:
1) Comply with the site-specific erosion and sediment control, and postconstruction requirements in this General Permit. 2) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as preconstruction (e.g., undisturbed vegetation for the area) conditions.

Furthermore, Responsible Dischargers are to comply with the RUSLE2 modeling requirements in Attachment H, Section I.G.2.

The Machado Lake Toxics TMDL’s final compliance deadline was September 30, 2019. Since this compliance deadline has passed,

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-220
compliance with the waste load allocations shall be met upon the effective date of this General Permit.
xi. Marina del Rey Toxics TMDL282
The Los Angeles Regional Water Quality Control Board adopted the Marina del Rey Toxics TMDL on February 6, 2014, to address the impairment of Marina del Rey Harbor due to chlordane, copper, DDT, dieldrin, fish consumption advisory, lead, polychlorinated biphenyls (PCBs), sediment toxicity, and zinc. During the development of this TMDL, review of available data indicated that dieldrin is no longer a cause of impairment, and that there is a dissolved copper impairment in the water column and sediment. · Source Analysis
Urban stormwater has been recognized as a substantial source of metals. Numerous researchers have documented that the most prevalent metals in urban stormwater (i.e., copper, lead, and zinc) are consistently associated with suspended solids. Because metals are typically associated with fine particles in stormwater runoff, they have the potential to accumulate in marine sediments where they may pose a toxicity risk. A majority of organic constituents in stormwater are also associated with particulates. Once the particles accumulate in the sediments in the harbor, the sediments themselves can become a source through re-suspension and are thus assigned load allocations.

Therefore, construction sites covered under this General Permit are considered Responsible Dischargers for the Marina del Rey Toxics TMDL.

In addition to stormwater runoff, copper-based anti-fouling paints are recognized as substantial sources of dissolved copper in the water column and sediments. Site-specific modeling indicated that 100 percent of copper loading came from copper-based anti-fouling hull paint and hull cleaning activities. Direct deposition of airborne particles to the water surface may be a minor source responsible for contributing metals and organic pollutants to the Marina del Rey Harbor.283
282 Los Angeles Regional Water Quality Control Board, Amendment to the Water Quality Control Plan – Los Angeles Region to incorporate the Marina del Rey Harbor Toxic Pollutants TMDL (February 6, 2014),
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/R14- 004_RB_BPA.pdf> [as of May 20, 2021] (Marina del Rey Harbor Toxics TMDL) 283 Marina del Rey Harbor Toxics TMDL, p. 3-4.

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NPDES No. CAS000002
FACT SHEET FS-221
· Waste Load Allocation Translation
The Marina del Rey Toxics TMDL assigns a mass-based waste load allocation per construction area in grams per day per acre (g/day/ac) or milligrams per day per acre (mg/day/ac) for chlordane, copper, total DDTs, Dichlorodiphenyldichloroethylene (p,p’-DDE), lead, total PCBs, and zinc for discharges into the Marina del Rey Harbor. The mass-based waste load allocations are shown in Table 66 and Table 67 below.

Table 66 – Marina del Rey Toxics Metals Waste Load Allocations Pollutant Waste Load Allocation (g/yr/ac)
Copper 1.9
Lead 2.6
Zinc 8.5
Table 67 – Marina del Rey Toxics OC Pesticides Waste Load Allocations Pollutant Waste Load Allocation (mg/yr/ac)
Chlordane 0.03
Total PCBs 1.3
Total DDTs 0.09
p,p’-DDE 0.12
Requiring Responsible Dischargers to directly implement the waste load allocation and sample for the pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most toxic pollutants loadings in this watershed are in particulate form and associated with wet-weather flows. Therefore, the following will address this TMDL:
1) Comply with the site-specific erosion and sediment control, and postconstruction requirements in this General Permit. 2) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as preconstruction (e.g., undisturbed vegetation for the area) conditions.

Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.
100 percent of the copper loadings into the Marina del Rey Harbor comes from the leaching of antifouling hull paint and from hull cleaning operations. Therefore, the copper numeric target will not be assigned to Responsible Dischargers and compliance with this waste load allocation shall be through compliance with this General Permit.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-222
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of the metals and toxic pollutants associated with the impaired water body, through the required pollutant source assessment, are to implement BMPs specific to preventing or controlling stormwater exposure to the metals and toxic pollutants. Furthermore, Responsible Dischargers are to comply with the RUSLE2 modeling requirements in Attachment H, Section I.G.2.

The Marina del Rey Toxics TMDL’s final compliance deadline was March 22, 2016. Since this compliance deadline has passed, the waste load allocations shall be met upon the effective date of this General Permit. xii. Oxnard Drain No. 3 Toxics TMDL284
The U.S. EPA adopted the Oxnard Drain No. 3 Toxics TMDL on October 6, 2011, to address the impairment of the Oxnard Drain No. 3 due to bifenthrin, chlorpyrifos, organochlorine (OC) pesticides (chlordane, DDT, dieldrin, and toxaphene), polychlorinated biphenyls, and sediment toxicity. · Source Analysis
The Oxnard Drain No. 3 Toxics TMDL identifies historic and current loadings of toxic pollutants, including construction sites that would be covered under this General Permit. During wet weather, discharges from construction sites have the potential to contribute toxic pollutant loadings. However, dry weather discharges have less potential to contribute to toxic pollutant loadings as non-stormwater discharges authorized by this General Permit are only authorized when they do not cause or contribute to a violation of any water quality standard.

Therefore, construction sites covered under this General Permit are considered Responsible Dischargers for the Oxnard Drain No. 3 Toxics TMDL.
· Waste Load Allocation Translation
The Oxnard Drain No. 3 Toxics TMDL assigns a concentration-based waste load allocation to construction stormwater discharges for 4,4’- 284 United States EPA Region IX, Total Maximum Daily Loads for Pesticides, PCBs, and Sediment Toxicity in Oxnard Drain No.3 (October 6, 2011), <https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/Established /Oxnard%20Drain%20No.%203%20Pesticides%20PCBs%20and%20Sediment%20T oxicity%20TMDL/oxnard-drain-3-tmdl-10-2011.pdf> [as of April 28, 2022] (Oxnard Drain No. 3 Toxics TMDL)

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-223
DDD, 4,4’-DDE, 4,4’-DDT, bifenthrin, chlorpyrifos, dieldrin, total chlordane, total PCBs, and toxaphene expressed as water, bed sediment and suspended sediment concentrations in ug/kg to be met at the construction site’s discharge location(s) for discharges into the Oxnard Drain No. 3. OC pesticides and PCBs have an affinity for organic matter and will partition from water to organic substances such as sediment, benthic organisms, and fish, so the sediment allocations are applied, shown in Table 68 below.

Table 68 – Oxnard Drain No. 3 Waste Load Allocations
Pollutant Waste Load Allocation of Suspended SedimentAssociated Contaminants (ug/kg dry weight) 4,4’-DDD 2.0
4,4’-DDE 2.2
4,4’-DDT 0.3
Bifenthrin -
Chlordane, Total 3.3
Chlorpyrifos -
Dieldrin 4.3
PCBs, Total 180
Sediment Toxicity -
Toxaphene 360
Requiring Responsible Dischargers to directly implement the waste load allocation and sample for the pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most toxic pollutants loadings in this watershed are in particulate form and associated with wet-weather flows. Therefore, the following will address this TMDL:
1) Comply with the site-specific erosion and sediment control, and postconstruction requirements in this General Permit. 2) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as preconstruction (e.g., undisturbed vegetation for the area) conditions.

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FACT SHEET FS-224
Furthermore, Responsible Dischargers are to comply with the RUSLE2 modeling requirements in Attachment H, Section I.G.2.

The Los Angeles Regional Water Quality Control Board has not adopted an Implementation Plan or a compliance schedule for the toxic pollutants addressed by the Oxnard Drain No. 3 Toxics TMDL. Therefore, Responsible Dischargers are required to achieve compliance with the waste load allocations upon the effective date of this General Permit. xiii. San Gabriel River Metals and Selenium TMDL285
The U.S. EPA adopted the San Gabriel River Metals TMDL on March 26, 2007, to address the impairment of San Gabriel River, estuary, and tributaries due to copper, lead, selenium, and zinc. A TMDL was not developed for the elevated levels of selenium in Reach 6 during dry weather conditions because the sources of selenium appear to be related to natural levels of selenium in the soils.
· Source Analysis
Sources of metals from construction sites include sediment-bound metals, construction materials, and equipment used on construction sites. Building materials and construction waste exposed to stormwater can leach and contribute metals to waterways. During dry weather, the potential contribution of metals loading from Responsible Dischargers is low.286
· Waste Load Allocation Translation
1) Dry-weather Waste Load Allocation
The San Gabriel River Metals TMDL assigns concentration-based and mass-based waste load allocations for dry-weather discharges of copper and selenium. Non-Stormwater Discharges (NSWDs) are authorized in this General Permit if Order, Section IV.A terms and conditions are met to control the discharge of pollutants from the construction site. Order, Section IV.B prohibits all NSWDs not authorized under Order, Section IV.A; therefore, all unauthorized NSWDs must be either eliminated or have regulatory coverage under a separate NPDES permit. Authorized NSWDs, as defined in this 285 U.S. Environmental Protection Agency Region IX, Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries (March 26, 2007) <https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/Established /San%20Gabriel%20River%20Metals%20TMDL/final_sangabriel_metalstmdl_3-27-

07.pdf> [as of May 20, 2021] (San Gabriel River Metals TMDL) 286 San Gabriel River Metals TMDL, p. 22.

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NPDES No. CAS000002
FACT SHEET FS-225
General Permit, are authorized because these discharges do not commingle with stormwater associated with construction activity. The Regional Water Board may impose additional requirements on NSWDs if deemed necessary per site-specific analysis.
2) Wet-weather Waste Load Allocations
The San Gabriel River Metals TMDL assigns a mass-based waste load allocation per construction area in kilograms per day (kg/d) for lead for discharges into the San Gabriel River Reach 2 watershed (all upstream reaches and tributaries) and Coyote Creek or its tributaries.

The waste load allocations are shown in Table 69 and Table 70 below.

Table 69 – San Gabriel River Reach 2 Watershed Waste Load Allocation Pollutant Waste Load Allocation (kg/d)
Lead 0.8
Table 70 – Coyote Creek Watershed Waste Load Allocations Pollutant Waste Load Allocation (kg/d)
Copper 0.513
Lead 2.07
Zinc 3.0
The San Gabriel River Metals TMDL Implementation Plan287 requires incorporation of the waste load allocations in this General Permit as permit limitations expressed as event mean concentrations. The term permit limitation is defined in the TMDL compliance plan as “a waterquality based effluent limitation or a receiving water limitation…permittees may demonstrate compliance with wet-weather waste load allocations in any one of three ways. First, general industrial and construction storm water permittees may be deemed in compliance with permit limitations if they demonstrate that there are no exceedances of the permit limitations at their discharge points or outfalls. Second, general industrial and construction storm water permittees may be deemed in compliance with permit limitations if they demonstrate that there are no exceedances of the permit 287 Los Angeles Regional Water Quality Control Board, Amendment to the Water Quality Control Plan – Los Angeles Region to Incorporate the Implementation Plan for the Total Maximum Daily Loads for Metals and Selenium in the San Gabriel River and Impaired Tributaries (June 6, 2013)
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/docs/R13- 004_RB_BPA.pdf> [as of May 20, 2021] (San Gabriel River Metals TMDL Implementation Plan)

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-226
limitations in the receiving water at, or downstream of, the permittee's outfalls. Third, if permittees provide a quantitative demonstration that control measures and best management practices (BMPs) will achieve wet-weather waste load allocations consistent with the schedule in Table 7-20.2, then compliance may be demonstrated by implementation of those control measures and BMPs, subject to Executive Officer approval.”288
The assigned mass-based waste load allocations require site-specific calculations that are incompatible with the monitoring and reporting requirements in this General Permit. Therefore, it is consistent with the requirements and assumptions of the waste load allocations to implement the San Gabriel River Metals and Selenium TMDL Numeric Targets as concentration-based numeric action levels to align the mass-based waste load allocations to the requirements in this General Permit. The TMDL implementation plan provided Responsible Dischargers the three above-stated options for demonstrating waste load allocation compliance and the appropriate option is to implement the TMDL-specific numeric action levels at the point of discharge for the Responsible Discharger’s construction site.

The assigned concentration-based numeric action levels are shown in Table 71 and Table 72 below. The units are converted from ug/L to mg/L to be consistent with the reporting units in SMARTS.

Table 71 – San Gabriel River Reach 2 Watershed Waste Load Allocation Translation (concentration-based, total recoverable)
Pollutant Numeric Targets (ug/L) Numeric Action Levels (mg/L) Lead 166 0.166
Table 72 – Coyote Creek Watershed Waste Load Allocations (concentrationbased, total recoverable) Pollutant Numeric Targets (ug/L) Numeric Action Levels (mg/L) Copper 27 0.027
Lead 106 0.106
Zinc 158 0.158
· Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that discharge into the San Gabriel River and that identify on-site sources of copper, lead, and zinc through the required pollutant source assessment, shall compare all 288 San Gabriel River Metals TMDL Implementation Plan, p. 4-5.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-227
non-visible sampling and analytical results to the applicable numeric action levels for the identified metals.

If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the numeric action levels in the future. Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to the metals sources are expected to meet the numeric action levels.

The San Gabriel River Metals TMDL’s final compliance deadline was September 30, 2017. Since this compliance deadline has passed, the numeric action levels are applicable upon the effective date of this General Permit.
xiv. Santa Monica Bay Toxics TMDL289
The U.S. EPA adopted the Santa Monica Bay Toxics TMDL on March 26, 2012, to address the impairment for Santa Monica Bay due to DDTs and polychlorinated biphenyls (PCBs). Santa Monica Bay, as defined in this TMDL, is Point Dume to Point Vicente and the Palos Verdes shelf from Point Vicente to Point Fermin.
· Source Analysis
DDTs are organochlorine insecticides widely used in the past on agricultural crops and to control disease-carrying insects. The United States banned the use of DDTs in 1972, except for public health emergencies involving insect diseases and control of body lice. Although use of DDTs is limited, it can persist in the environment, adhering strongly to soil particles. PCBs are mixtures of up to 209 individual chlorinated compounds (known as congeners). In 1976, the manufacturing of PCBs was prohibited because of evidence that they build up in the environment and can cause harmful health effects. Similar to DDTs, PCBs adhere to soil and can be transported into watersheds via erosion and stormwater runoff. Studies within the watershed indicated that concentrations of DDTs and PCBs in stormwater may exceed human health criteria. Therefore, construction sites covered 289 U.S. Environmental Protection Agency Region IX, Santa Monica Bay Total Maximum Daily Loads for DDTs and PCBs (March 26, 2012),
<https://www.waterboards.ca.gov/losangeles/water_issues/programs/tmdl/Established /SantaMonica/FinalSantaMonicaBayDDTPCBsTMDL.pdf> [as of May 20, 2021] (Santa Monica Bay Toxics TMDL)

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-228
under this General Permit are considered Responsible Dischargers for the Santa Monica Bay Toxics TMDL.
· Waste Load Allocation Translation
The Santa Monica Bay Toxics TMDL assigns mass-based waste load allocations of 0.16 g/yr for DDT and 0.82 g/yr for PCBs to be met at the construction site’s discharge location(s) for discharges into Santa Monica Bay. The waste load allocations are based on the aggregate area represented by individual permittees covered under this General Permit, which is roughly 0.56 percent of the watershed’s total area.

Table 73 shows the waste load allocation below.

Table 73 – Santa Monica Bay Toxics Waste Load Allocations Pollutant Waste Load Allocation (g/yr)
DDTs 0.16
PCBs 0.82
Permittees covered under this General Permit are not expected to perform individual sampling. Requiring Responsible Dischargers to directly implement the waste load allocation and sample for the pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most toxic pollutants loadings in this watershed are in particulate form and associated with wet-weather flows. Therefore, the following will address this TMDL:
1) Comply with the site-specific erosion and sediment control, and postconstruction requirements in this General Permit. 2) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as preconstruction (e.g., undisturbed vegetation for the area) conditions.

Furthermore, Responsible Dischargers are to comply with the RUSLE 2 modeling requirements in Attachment H, Section I.G.2.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-229
The Los Angeles Regional Water Quality Control Board has not adopted an Implementation Plan or a compliance schedule for the toxic pollutants addressed by the Santa Monica Bay Toxics TMDL. Therefore, Responsible Dischargers are required to achieve compliance with the waste load allocations upon the effective date of this General Permit. xv. San Diego Creek and Newport Bay Toxics TMDL 290,291 The U.S. EPA adopted the San Diego Creek and Newport Bay Toxics TMDL on June 14, 2002, to address the impairments of San Diego Creek and Newport Bay due to cadmium, chlordane, chlorpyrifos, chromium, copper, DDT, diazinon, dieldrin, lead, mercury, polychlorinated biphenyls (PCBs), selenium, toxaphene, and zinc. However, the Santa Ana Regional Water Quality Control Board adopted a separate Revised Organochlorine Compounds (chlordane, DDT, dieldrin, PCBs, and toxaphene) TMDL on July 15, 2011, which revises the loading capacities in the U.S. EPA TMDL based on an updated impairment assessment. For the purpose of this General Permit and factsheet, both TMDLs will be addressed as a single San Diego Creek and Newport Bay Toxics TMDL.
· Source Analysis
The San Diego Creek and Newport Bay Toxics TMDL provides source analyses specific to the pollutant categories: metals, organochlorine compounds, chromium, and mercury. These pollutants are known to adsorb or adhere to sediment which are transported through the watershed via soil erosion and runoff. Surface runoff from natural background and man-made contributions are estimated to be the largest source of metals within San Diego Creek and its tributaries. The largest source of dissolved metals (except copper) to Upper and Lower Newport Bay are thought to be freshwater-borne loads from San Diego Creek.

Likewise, the main source of continual loadings of organochlorine pollutants to the Newport Bay watershed is also attributed to erosion of 290 United States EPA, Total Maximum Daily Loads for Toxic Pollutants San Diego Creek and Newport Bay, California (June 14, 2002),
<https://www.waterboards.ca.gov/santaana/water_issues/programs/tmdl/docs/sd_crk_ nb_toxics_tmdl/summary0602.pdf> [as of May 20, 2021] (San Diego Creek and Newport Bay Toxics TMDL)
291 Santa Ana Regional Water Quality Control Board, Revised Organochlorine Compounds TMDLs for San Diego Creek, Upper and Lower Newport Bay (July 15, 2015),
<https://www.waterboards.ca.gov/rwqcb8/water_issues/programs/tmdl/docs/oc/2011- 0037/FINAL/R8-2011-0037_Attachment2_Final_BPA.PDF> [as of May 20, 2021] (San Diego Creek and Newport Bay Toxics TMDL)

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ORDER WQ 2022-0057-DWQ
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FACT SHEET FS-230
surface soils or in-stream sediments, primarily from San Diego Creek.

Construction activities have the potential to exacerbate erosion within the watershed, therefore construction sites covered under this General Permit are considered Responsible Dischargers.

Chlorpyrifos, chromium, diazinon, dieldrin, mercury, and selenium are not translated for this General Permit as construction stormwater discharges are not identified as sources of these pollutants. · Waste Load Allocation Translation
The San Diego Creek and Newport Bay Toxics TMDL assigns waste load allocations for various metals (cadmium, copper, lead, and zinc) and organochlorine compounds (chlordane, DDT, PCBs, and toxaphene) to Responsible Dischargers to be met at the site’s discharge location(s) for dischargers into Newport Bay or San Diego Creek and its tributaries.

The following list details the water bodies and their associated pollutants with assigned waste load allocations:
1) San Diego Creek: cadmium, copper, lead, zinc, DDT, and toxaphene The San Diego Creek and Newport Bay Toxics TMDL assigns concentration-based waste load allocations for cadmium, copper, lead, and zinc to the category “Other NPDES permittees” which includes Responsible Dischargers in addition to seven other NPDES permits. The TMDL does not specifically identify construction stormwater dischargers as a major source of metals to the impaired waterbodies or divide the waste load allocations between permitted dischargers. Furthermore, the TMDL includes an option for the Water Boards to conduct a permit-specific analysis to divide the waste load allocations; however, conducting the analysis on a discharge flow, volume, and timing basis is not aligned with the framework of this General Permit.

The waste load allocations are assigned to Responsible Dischargers to be met at the construction site’s discharge location(s) for discharges into San Diego Creek and its tributaries including the Santa Ana-Delhi Channel, Big Canyon Channel, East Costa Mesa Channel, and other tributaries into San Diego Creek (San Diego Creek Watershed). Therefore, these waste load allocations are translated as concentration-based numeric action levels applied at the point(s) of discharge from the Responsible Discharger’s construction site. The waste load allocations are hardness dependent, meaning the receiving water body hardness must be known to calculate the waste load allocations.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-231
Receiving water body hardness is dependent on receiving water body flow. The U.S. EPA calculated the hardness-dependent criteria for cadmium, copper, lead, and zinc as shown in Table 5-2 of the San Diego Toxics TMDL with the following CTR equation:

CMC = WER X (Acute Conversion Factor) X
(exp{mA[ln (hardness)]+bA})
Where CMC stands for criterion maximum concentration, WER is the water effect ratio, and mA and bA are constants, specific to each metal. Hardness is defined as the concentration of calcium carbonate (CaCO3) in the water column and has the units of milligram per liter (mg/L). Freshwater aquatic life criteria for certain metals are expressed as a function of hardness because hardness and/or water quality characteristics that are usually correlated with hardness can reduce or increase the toxicity of some metals. The site-specific hardness is used to calculate the metal numeric targets.

Only one hardness value is selected to be representative of the receiving water body instead of requiring Responsible Dischargers to sample for receiving water body hardness in concurrence with taking a discharge sample to calculate the metal criteria. This is consistent with the approach taken in many hardness-dependent TMDLs of assigning a hardness value based on existing data. The U.S. EPA and the Santa Ana Regional Water Quality Control Board staff evaluated daily flow records of the San Diego Creek for 19 years.

The TMDL developed multiple receiving water hardness values based on flow and did not assign one hardness value to be representative of the San Diego Creek water body. A hardness of 197mg/L was calculated as the average hardness for large flows and is selected as the typical hardness value associated with a precipitation event flow at San Diego Creek. Table 5-2 of the San Diego Toxics TMDL shows how the California Toxics Rule (CTR) equation was used to calculate the acute concentration criteria at a hardness of 197 mg/L.

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ORDER WQ 2022-0057-DWQ
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FACT SHEET FS-232
Table 74 – San Diego Creek Watershed Waste Load Allocation Translation Parameter CTR Equation
Total Criteria
with 197
hardness in
mg/L
Total
freshwater
acute
concentration
Numeric Action
Level mg/L*
Cadmium (exp(1.128*ln(hardness)-3.6867)) 0.0097 0.0097
Copper (exp(0.9422*ln(hardness)-1.7)) 0.027 0.027
Lead (exp(1.273*ln(hardness)-1.460)) 0.194 0.194
Zinc (exp(0.8473*ln(hardness)+0.884)) 0.21 0.21
*Values are rounded to reflect the significant figures of each respective pollutant An average hardness of San Diego Creek was selected to calculate the criteria for translating each pollutant into a numeric action level in the San Diego Toxics TMDL because it is not feasible or practical to require Responsible Dischargers to collect the ambient hardness of the receiving water body in concurrence with each monitoring sample.

The Revised Organochlorine Compounds TMDL assigns massbased waste load allocations for total DDT and toxaphene on an annual basis to Responsible Dischargers in the San Diego Creek watershed, shown in Table 76 below. Requiring Responsible Dischargers to calculate the construction site’s specific mass loading of a pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most organochlorine compound loadings in this watershed are in the form of fine sediment transported through erosion. The TMDL’s implementation plan intends to use source control to reduce the loading of organochlorine compounds into the watershed, which is aligned with the requirements of this General Permit. Therefore, the following will address this TMDL:
a) Comply with the site-specific erosion and sediment controls, and post-construction requirements in this General Permit.
b) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as pre-construction (e.g., undisturbed vegetation for the area) conditions. Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.

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FACT SHEET FS-233
2) Upper Newport Bay: cadmium, copper, lead, zinc, chlordane, DDT, and PCBs
Mass-based waste load allocations for dissolved cadmium, copper, lead, and zinc are assigned to be met in the receiving water of Upper Newport Bay. Concentration-based waste load allocations for cadmium, copper, lead, and zinc in Upper Newport Bay are assigned to Other NPDES Dischargers, which includes construction stormwater dischargers. However, the TMDL does not specifically identify construction stormwater dischargers as a major source of metals to the impaired waterbodies or divide the waste load allocations between permitted dischargers. The TMDL includes an option for the Water Boards to conduct a permit-specific analysis to dive the waste load allocations; however, conducting the analysis on a discharge flow, volume, and timing basis is not aligned with the framework of this General Permit. Therefore, these waste load allocations are translated as concentration-based numeric action levels applied to the point(s) of discharge from the Responsible Discharger’s construction site. The concentration-based waste load allocations are translated into total concentrations using the CTR conversion factor for saltwater acute criteria. The numeric action levels are shown in Table 75 below.

The Revised Organochlorine Compounds TMDL assigns massbased waste load allocations for chlordane, DDT, and PCBs on an annual basis to Responsible Dischargers in Upper Newport Bay, shown in Table 76 below. Requiring Responsible Dischargers to calculate the construction site’s specific mass loading of a pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most organochlorine compound loadings in this watershed are in the form of fine sediment transported through erosion. The TMDL’s implementation plan intends to use source control to reduce the loading of organochlorine compounds into the watershed, which is aligned with the requirements of this General Permit. Therefore, the following will address this TMDL:
a) Comply with the site-specific erosion and sediment controls, and post-construction requirements in this General Permit.
b) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as pre-construction (e.g., undisturbed vegetation for the area) conditions. Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-234
3) Lower Newport Bay: copper, lead, zinc, chlordane, DDT, and PCBs Mass-based waste load allocations for dissolved copper, lead, and zinc are assigned to be met in the receiving water of Lower Newport Bay. Concentration-based waste load allocations for copper, lead, and zinc in Lower Newport Bay are assigned to Other NPDES Dischargers, which includes construction stormwater dischargers.

However, the TMDL does not specifically identify construction stormwater dischargers as a major source of metals to the impaired waterbodies or divide the waste load allocations between permitted dischargers. The TMDL includes an option for the Water Boards to conduct a permit-specific analysis to dive the waste load allocations; however, conducting the analysis on a discharge flow, volume, and timing basis is not aligned with the framework of this General Permit.

Therefore, these waste load allocations are translated as concentration-based numeric action levels applied to the point(s) of discharge from the Responsible Discharger’s construction site. The concentration-based waste load allocations are translated into total concentrations using the CTR conversion factor for saltwater acute criteria. The numeric action levels are shown in Table 75 below.

The Revised Organochlorine Compounds TMDL assigns massbased waste load allocations for chlordane, DDT, and PCBs on an annual basis to Responsible Dischargers in Lower Newport Bay, shown in Table 76 below. Requiring Responsible Dischargers to calculate the construction site’s specific mass loading of a pollutant(s) would be impractical, costly, and not aligned with the requirements of this General Permit. However, as mentioned in the source analysis, most organochlorine compound loadings in this watershed are in the form of fine sediment transported through erosion. The TMDL’s implementation plan intends to use source control to reduce the loading of organochlorine compounds into the watershed, which is aligned with the requirements of this General Permit. Therefore, the following will address this TMDL:
a) Comply with the site-specific erosion and sediment controls, and post-construction requirements in this General Permit.
b) For each phase of the construction project, install erosion controls that will result in predicted erosion rates that are as protective as pre-construction (e.g., undisturbed vegetation for the area) conditions. Calculate the predicted erosion rates by using RUSLE2 modeling as described in Attachment H.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-235
4) Rhine Channel Area of Lower Newport Bay: copper, lead, and zinc Mass-based waste load allocations for dissolved, copper, lead, and zinc are assigned to be met in the receiving water of the Rhine Channel. Concentration-based waste load allocations for copper, lead, and zinc in Lower Newport Bay are assigned to Other NPDES Dischargers, which includes construction stormwater dischargers.

Table 75 – Upper Newport Bay, Lower Newport Bay and Bay Segments, and Rhine Channel Metals Waste Load Allocation Translation
Parameter
Dissolved
saltwater acute
TMDLs and
allocations (ug/L)
CTR Conversion
Factor for saltwater
acute criteria
Total saltwater acute
concentration
Numeric Action Level
(mg/L)
Cadmium* 42 0.994 0.042**
Copper 4.8 0.83 0.00578**
Lead 210 0.951 0.221**
Zinc 90 0.946 0.095**
*Applies to Upper Newport Bay only
**Values are rounded to reflect the significant figures of each respective pollutant Table 76 – San Diego Creek, Upper Newport Bay and Lower Newport Bay Organochlorine Compounds Waste Load Allocations
Parameter Total DDT
(g/yr)
Chlordane
(g/yr)
Total PCBs
(g/yr)
Toxaphene
(g/yr)
San Diego Creek 99.8 1.5
Upper Newport Bay 40.3 23.4 23.2
Lower Newport Bay 14.9 8.6 60.7

Page 780 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-236
· Compliance Actions and Schedule
1) Metals
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that discharge into San Diego Creek, Upper Newport Bay, Lower Newport Bay, or the Rhine Channel and that identify on-site sources of cadmium, copper, lead, and zinc through the required pollutant source assessment, shall compare all non-visible sampling and analytical results to the applicable numeric action levels for the identified metals.

If an exceedance or failure of a BMP is observed, the Responsible Discharger shall evaluate the BMPs being used and identify and implement a strategy in the site’s SWPPP to prevent potential exceedances of the numeric action levels in the future. Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to the metals’ sources are expected to meet the numeric action levels.

The Santa Ana Regional Water Quality Control Board has not adopted an Implementation Plan or a compliance schedule for the metals addressed by the San Diego Creek and Newport Bay Toxics TMDL. Therefore, Responsible Dischargers are required to achieve compliance with the translated numeric action levels by the effective date of this General Permit.
2) Organochlorine Compounds
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that identify on-site sources of organochlorine compounds associated with the impaired water body, through the required pollutant source assessment, are to implement BMPs specific to preventing or controlling stormwater exposure to the organochlorine compounds. Furthermore,
Responsible Dischargers are to comply with the RUSLE2 modeling requirements in Attachment H, Section I.G.2.

The Revised Organochlorine Compounds TMDL’s final compliance deadline for the TMDLs is December 31, 2020. Therefore, Responsible Dischargers shall comply with the requirements of this General Permit and the RUSLE2 modeling requirements in
Attachment H, Section I.G.2, upon the effective date of this General Permit.

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-237
xvi. Chollas Creek Metals TMDL292
The San Diego Regional Water Quality Control Board adopted the Chollas Creek Metals TMDL on June 13, 2007, to address the impairment of Chollas Creek due to dissolved copper, lead, and zinc.
· Source Analysis
The major urban runoff contributors of copper, lead, and zinc into Chollas Creek include freeways, commercial, and industrial land uses.293 Construction erosion is a potential source of metals in Chollas Creek.294 Sediment is assumed to not reside in Chollas Creek long enough to allow metal concentrations to build to high enough levels that the sediment becomes a source to the creek.295 However, construction sites covered under this General Permit are identified as Responsible Dischargers for the Chollas Creek Metals TMDL.
· Waste Load Allocation Translation
The Chollas Creek Metals TMDL assigns waste load allocations for dissolved copper, lead, and zinc to Responsible Dischargers to be met at the construction discharge location(s).

The waste load allocations for dissolved copper, lead, and zinc are concentration-based and set equal to 90 percent of the numeric targets, which is the CTR acute criteria, shown in Table 77 below. 292 San Diego Regional Water Quality Control Board, A Resolution Adopting an Amendment to the Water Quality Control Plan for the San Diego Basin (9) to Incorporate Total Maximum Daily Loads for Dissolved Copper, Lead, and Zinc in Chollas Creek, Tributary to San Diego Bay, and to Revise the Toxic Pollutants Section of Chapter 3 to Reference the California Toxics Rule (June 2007) <https://www.waterboards.ca.gov/sandiego/water_issues/programs/tmdls/docs/chollas creekmetals/update011509/R9-2007-0043_Signed.pdf> [as of May 20, 2021] (Chollas Creek Metals TMDL)
293 Chollas Creek Metals TMDL, p. 3.
294 San Diego Regional Water Quality Control Board, Total Maximum Daily Loads for Dissolved Copper, Lead, and Zinc in Chollas Creek, Tributary to San Diego Bay (May 2007)
<https://www.waterboards.ca.gov/sandiego/water_issues/programs/tmdls/docs/chollas creekmetals/update011509/Technical_Report.pdf> [as of May 20, 2021] (Chollas Creek Metals TMDL Technical Report)
295 Chollas Creek Metals TMDL Technical Report, p. 49-50.

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ORDER WQ 2022-0057-DWQ
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FACT SHEET FS-238
Table 77 – Chollas Creek Metals Waste Load Allocations
Pollutant 90 Percent of Dissolved Metal Concentration Numeric Targets (ug/L)
Dissolved Copper (0.90) X (0.96) X exp(0.9422 X ln[hardness] – 1.700) X WER Dissolved Lead (0.90) X [1.46203 – 0.145712 X ln(hardness)] X exp(1.273 X ln[hardness] – 1.460) X WER
Dissolved Zinc (0.90) X (0.978) X exp(0.8473 X ln[hardness] + 0.884) X WER The CTR acute criteria for dissolved copper, lead, and zinc are calculated using water effect ratios (WER), which represents the correlation between the concentrations present in the water column and the concentrations that are biologically available and toxic to aquatic life.

The San Diego Regional Water Board adopted Resolution R9-2017- 0015 which established site-specific WERs for dissolved copper (6.998) and zinc (1.711) in Chollas Creek. In the absence of a site-specific WER, such as for lead, a default value of 1.0 is used.

The CTR acute criteria calculation also requires receiving water body hardness, which results in a floating target that would differ at each sample because the receiving water body hardness is dependent on receiving water body flow. Hardness is defined as the concentration of calcium carbonate (CaCO3) in the water column and has the units of milligram per liter (mg/L). Freshwater aquatic life criteria for certain metals are expressed as a function of hardness because hardness and/or water quality characteristics that are usually correlated with hardness can reduce or increase the toxicities of some metals.

Known site-specific hardness data is used to calculate the waste load allocation instead of requiring Responsible Dischargers to calculate their metal limit by sampling the receiving water body hardness in concurrence with taking a discharge sample. This is consistent with the approach taken in many hardness dependent TMDLs of assigning a hardness value based on existing data. Hardness data for Chollas Creek was obtained by Regional Board TMDL staff from California Integrated Water Quality System (CIWQS). Data analysis was conducted on hardness results from wet-weather sampling events from the Chollas Creek TMDL watershed with sample dates ranging from 1994 to 2017.

All results obtained were marked as part of the Chollas Creek TMDL project, however not all stations had specific location information.

Statistics run on the data set produced a hardness geometric mean of

94.07 mg/L. Table 78 below shows how the CTR equation was used to calculate the acute concentration criteria at a hardness of 94.07 mg/L.

Page 783 of 978 ends

ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
FACT SHEET FS-239
Table 78 – Chollas Creek Dissolved Metals Waste Load Allocation Translation Pollutant CTR equation
Total Criteria
(ug/L) using
hardness of

94.07 mg/L
90 Percent of
Total Criteria
as the Waste
Load
Allocation
(ug/L)
Translated
Numeric
Effluent
Limitations
(mg/L)*
Copper 6.998 X (exp(0.9422 X
ln[hardness] - 1.7)) 92.4823777 83.23413993 0.083
Lead 1 X (exp(1.273 X
ln[hardness] - 1.460)) 75.5324136 67.97917227 0.068
Zinc 1.711 X (exp(0.8473 X
ln[hardness] + 0.884)) 194.6576544 175.181889 0.175
*Values are rounded to reflect the significant figures of each respective pollutant A geometric mean hardness of Chollas Creek was selected to calculate the criteria for translating each pollutant into a numeric effluent limitation in the Chollas Creek Metals TMDL because it is not feasible or practical to require Responsible Dischargers to collect the ambient hardness of the receiving water body in concurrence with each monitoring sample.

Therefore, Responsible Dischargers are assigned numeric effluent limitations for dissolved copper, lead, and zinc for discharges to Chollas Creek to be met at the construction site’s discharge location(s). · Compliance Actions and Schedule
Responsible Dischargers shall comply with the requirements of this General Permit. Responsible Dischargers that discharge into Chollas Creek and that identify on-site sources of copper, lead, and zinc through the required pollutant source assessment, shall compare all non-visible sampling and analytical results to the applicable numeric effluent limitations for the identified metals.

Responsible Dischargers that perform the required pollutant source assessment and implement BMPs specific to preventing or controlling stormwater exposure to the metals’ sources are expected to meet the numeric effluent limitations.

The Chollas Creek Metals TMDL’s final compliance deadline is October 22, 2028. As an interim target, Responsible Dischargers shall apply the translated numeric effluent limitation values as numeric action levels up until the compliance date of October 22, 2028. Future reissuances of this General Permit may incorporate additional or revised compliance

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FACT SHEET FS-240
requirements or interim targets to progress towards the required final compliance when a numeric effluent limitation applies.

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NPDES No. CAS000002
ATTACHMENT C C-1

ATTACHMENT C

CONTACTS

NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)

GENERAL PERMIT FOR STORMWATER DISCHARGES ASSOCAITED

WITH CONSTRUCTION AND LAND DISTURBANCE ACTIVITIES
(GENERAL PERMIT)
State Water Resources Control Board
www.waterboards.ca.gov
P.O. Box 1977
Sacramento, CA 95812-1977
[email protected]
Division of Financial Assistance: (916) 341-5700
Division of Water Quality: (916) 341-5455
Office of Enforcement: (916) 341-5272
Office of Public Affairs: (916) 341-5254
Office of Legislative Affairs: (916) 341-5251
Office of the Ombudsman: (916) 341-5254

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ORDER WQ 2022-0057-DWQ
NPDES No. CAS000002
ATTACHMENT C C-2

ATTACHMENT C
Regional Water Quality Control Board Stormwater Program Contacts NORTH COAST REGION (1)
[email protected]
5550 Skylane Boulevard, Suite A
Santa Rosa, CA 95403
(707) 576-2220
CENTRAL COAST REGION (3)
[email protected]
895 Aerovista Place, Suite 101
San Luis Obispo, CA 93401
(805) 549-3147
CENTRAL VALLEY REGION (5S)
[email protected]
11020 Sun Center Drive, Suite 200
Rancho Cordova, CA 95670-6114
(916) 464-3291
FRESNO BRANCH OFFICE (5F)
[email protected]
1685 E Street
Fresno, CA 93706
(559) 445-5116
VICTORVILLE BRANCH OFFICE (6V)
[email protected]
15095 Amargosa Road—Bldg 2,
Suite 210
Victorville, CA 92394
(760) 241-6583
SANTA ANA REGION (8)
[email protected]
3737 Main Street, Suite 500
Riverside, CA 92501-3348
(951) 782-4130
SAN FRANCISCO BAY REGION (2)
[email protected]
1515 Clay Street, Suite 1400
Oakland, CA 94612
(510) 622-2402
LOS ANGELES REGION (4)
[email protected]
320 W. 4th Street, Suite 200
Los Angeles, CA 90013
(213) 576-6600
REDDING BRANCH OFFICE (5R)
[email protected]
364 Knollcrest Drive, Suite 205
Redding, CA 96002
(530) 224-4845
LAHONTAN REGION (6SLT)
[email protected]
2501 Lake Tahoe Blvd
South Lake Tahoe, CA 96150
(530) 542-5400
COLORADO RIVER REGION (7)
[email protected]
73-720 Fred Waring Drive, Suite 100
Palm Desert, CA 92260
(760) 346-7491
SAN DIEGO REGION (9)
[email protected]
2375 Northside Drive, Suite 100
San Diego, CA 92108-2700
(619) 516-1990

STORMWATER STAFF DIRECTORY
https://www.waterboards.ca.gov/water_issue
s/programs/stormwater/contact.html

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Project No. ST-5006, CML-5393(036)
Appendices
APPENDIX D – STORM WATER

2. Post-Construction Stormwater Management Plan (PCSMP) PCSMP due within 15 calendar days after the receipt of Notice of Award

Page 788 of 978 ends

PARCEL #:

Project Name:

Preparation/Revision Date: 2/20/2026
Prepared for:

Name of Owner/Developer:

Stress Address:

City, State, Zip Code:

Telephone:

Prepared by:

Name and Title of Preparer:

Company Name:

Stress Address:

City, State, Zip Code:

Telephone:

I hereby certify that the information provided in this Application is correct.

Application Prepared by:

Print Name and Firm
Signed
Signature of Project Engineer in the Firm Named Above
Title
Note: Following Contractor selection, all blanks, post-construction sections, and design values shall be confirmed by the Contractor. The PCSMP shall be updated accordingly and resubmitted to the City for review and approval.

Los Angeles, CA 90017

VENTURA COUNTYWIDE STORMWATER QUALITY PROGRAM

POST-CONSTRUCTION STORMWATER MANAGEMENT PLAN (PCSMP)
FOR
ST-5006 Pleasant Valley Bike Lanes
ST-5006 Pleasant Valley Bike Lanes
City of Camarillo
Pleasant Valley Road
Camarillo, CA 93010
(805) 388-5300
Nicole Dias, PE
Kimley-Horn
660 S. Figueroa St, Suite 2050
(213) 261-4040
Nicole Dias, Kimley-Horn
Affix Professional registration stamp of the person named above with signature and expiration date

Page 789 of 978 ends

Project Name:

STEP 1: DETERMINE PROJECT APPLICABILITY
Y/N/NA
N
N
N
N
N
N
Y
N
N
2) Industrial parks with 10,000 square feet or more of total altered surface area →go to Step 2
3) Commercial strip malls with 10,000 square feet or more of impervious surface area →go to Step 2
4) Retail gasoline outlets with 5,000 square feet or more of total altered surface area →go to Step 2
5) Restaurants (Standard Industrial Classification (SIC) of 5812) with 5,000 square feet or more of total altered surface area
→go to Step 2
6) Parking lots with 5,000 square feet or more of impervious surface area, or with 25 or more parking spaces
→go to Step 2
7) Streets, roads, highways, and freeway construction of 10,000 square feet or more of impervious surface area
→ go to Roadway Projects
8) Automotive service facilities (Standard Industrial Classification (SIC) of 5013, 5014, 5511, 5541, 7532-7534 and 7536-7539) of 5,000 square feet or more of total altered surface area →go to Step 2
9) Projects located in or directly adjacent to, or discharging directly to an Environmentally Sensitive Area (ESA), where the development will:
a. Discharge stormwater runoff that is likely to impact a sensitive biological species or habitat; and b. Create 2,500 square feet or more of impervious surface area →go to Step 2
1) Development projects equal to 1 acre or greater of disturbed area that adds more than 10,000 square feet of impervious surface area
→go to Step 2
ST-5006 Pleasant Valley Bike Lanes
Instructions:

For new development projects, answer yes, no, or NA to questions (1) - (10) below.

For redevelopment projects , answer yes, no, or NA to questions (11) - (13) below.

NEW DEVELOPMENT PROJECTS
Does the new development project fall within categories (1) - (10) below? Project Type and/or Characteristics

Page 790 of 978 ends

N
Project Name:

Y/N/NA
N/A
N/A
N/A
For redevelopment projects that fall within categories (1) through (9) above, and that conduct land-disturbing activities that result in the creation, or addition, or replacement of 5,000 square feet or more of impervious surface area on an already developed site, answer questions 11-13 below.Existing single-family dwelling and accessory structures are exempt from redevelopment projects unless such projects create, add, or replace 10,000 square feet of impervious surface area.

Project Type and/or Characteristics
11) Projects where redevelopment results in an alteration to more than fifty percent of impervious surfaces of a previously existing development, and the existing development was not subject to the post development stormwater quality control requirements of Board Order 00-108, these projects must mitigate the entire redevelopment project area
→go to Step 2
12) Projects where redevelopment results in an alteration to more than fifty percent of impervious surfaces of a previously existing development, and the existing development was subject to the post development stormwater quality control requirements of Board Order 00-108, the project must mitigate only the altered portion of the redevelopment project area and not the entire project area →go to Step 2
13) Projects where redevelopment results in an alteration of less than fifty percent of impervious surfaces of a previously existing development these projects must mitigate only the altered portion of the redevelopment project area and not the entire project area →go to Step 2

REDEVELOPMENT PROJECTS
10) Single-family hillside homes (see Section 2 of the TGM for specific requirements) →go to SF Hillside
ST-5006 Pleasant Valley Bike Lanes
PROJECT APPLICABILITY, CONT.

Page 791 of 978 ends

Project Name:

ROADWAY PROJECTS: ASSESS SITE CONDITIONS
General Characteristics
General Project Characteristics
Total Project Site Area
Estimated Disturbed Area
Total Pre-Project Impervious Area
Post-Project Impervious Area [1]
Area Draining to Hydrologic Source
Controls (ET-2) [1]
Revised Post-Project Impervious Area
Project Imperviousness (%)
Project Description
Describe current and proposed zoning and land use designation:

Per the City of Camarillo Zoning Map, Pleasant Valley Road is surrounded by agricultural exclusive, rural exclusive, limited manufacturing, and light manufacturing. Per the California Department of Conservations, the surrounding lands are identified as Prime Farmland and Farmland of Statewide Importance. In addition, the adjacent agricultural lands are under a Williamson Act contract.

Describe topography of project area. Identify low and high points and the location of steep slopes (provide a range of grades):

The existing project vicinity topography generally slopes southwesterly and consists primarily of agricultural fields; as such, the overland grades range between approximately 0.3% to 0.7% slope. Pleasant Valley Road runs east/west and the proposed roadway has a superelevated roadway cross slope of 1.5-2% on the travel lanes and 5% within the bicycle lane and buffer.

Drainage sheet flows across the roadway and shoulder to the northern ditch that runs parallel to Pleasant Valley Road. The existing drainage ditch along the northern shoulder of the road has eroded to about 4-5 feet deep and about 10-13 feet wide.

The drainage ditch has numerous culvert-type crossings for residential and agricultural access to the north. Additionally, power/utility poles are located in the northern bank of the drainage and large power poles are located along the southern side of Pleasant Valley Road.

Describe the site's soil types (A, B, C, D) and geological conditions:

Pleasant Valley Road is underlain by alluvial deposits of sand, silt, and clay. The majority of the alignment is mapped as hydrologic Soil Group C (Ventura County Soil Types 2 and 3) with very low to low infiltration rates.

The project consists of minor roadway widening along a 1.6-mile section of Pleasant Valley Road and reconstruction of the roadway cross slopes from a crowned roadway to a superelevated roadway which will slope towards the north channel to accommodate the widening for the Class II bike lanes and buffers. The bike lanes will connect from Las Posas Rd to E 5th St.

The project includes the reconstruction of the severely eroded embankments along the north earthen drainage ditch along Pleasant Valley Road. Project improvements include the installation of nine [9] curb inlet catch basins and nine [9] attached Modular Wetland System proprietary biofiltration units for water quality treatment. Overflows from the Modular Wetland Systems will discharge into the northern drainage ditch, matching existing conditions.

ST-5006 Pleasant Valley Bike Lanes
►This tab only applies to Roadway Projects
►Provide an assessment of the project site using the following tables Area (acres)

9.00 9.00

4.05 6.23

0.00 6.23

69.22%
Briefly describe project:

Page 792 of 978 ends

Project Name:

ROADWAY PROJECTS: ASSESS SITE CONDITIONS, CONT.

Y/N/NA
N
N
Y
Attach relevant geotechnical information
Pleasant Valley Road is within a liquefaction zone from Las Posas Road to west of Southfield Road. The onsite soils consist primarily of fine grained clay (plasticity index of 16 to 18 to depths of 20 to 30 feet) with a low collapse (hydroconsolidation) potential. Clay soils with a PI of 16 to 18 typically correlate with a low to moderate expansion index (EI).

Drainage to the site is predominantly due to stormwater runoff from the superelevated roadway. Offsite drainage from the City Pump Station and agricultural land enters the channel through a pipe along at (10) locations on the project. A portion of the offsite drainage enters the channel prior to the ditch along Southfield Road.

Describe any existing utilities within the project area that would limit the possible locations of certain BMPs:

Pleasant Valley Road is constrained by existing utilities on each side of the roadway. On the north side, it is constrained by power poles and on the south side it is constrained by large Southern California Edison utility poles.

Describe any environmentally sensitive areas (e.g. riparian areas, wetlands) within the project area:

The existing northern earthen ditch along Pleasant Valley Road conveys surface water, has a defined bed and bank, and flows to Revolon Slough. It falls under the jurisdiction of the United States Army Corps of Engineers (USACE), Regional Water Quality Control Board (RWQCB), and California Department of Fish and Wildlife (CDFW). There is approximately 0.98 acre of non-wetland waters under jurisdiction of the USACE and RWQCB and 3.67 acres under CDFW jurisdiction.

Geotechnical considerations:

Does the site contain any of the following characteristics:

Collapsible Soil
Expansion Soil
Potential for seismically-inducted soil liquefaction
Additional considerations:

Is there offsite drainage on the site? If so, identify the location(s) and source(s) of offsite drainage and the volume of water running onto the site:

Attach soil type information
Describe the site's groundwater conditions (e.g. depth to seasonal high groundwater):

The groundwater conditions along Pleasant Valley Road range from -13 to -50 in the upper aquifer and -107 in the lower aquifer system per the Ventura County Public Works Watershed Protection Resources Division. Additionally, groundwater was not encountered during the Geotechnical Investigation, conducted by Oakridge Geoscience, Inc. in May 2020, but it was noted that infiltration testing at depths of 11ft within the north ditch encountered very moist soils.

Attach source of groundwater information
ST-5006 Pleasant Valley Bike Lanes

Page 793 of 978 ends

Project Name:

ROADWAY PROJECTS: POLLUTANTS OF CONCERN
Identify pollutants of concern using the tables below
Pollutants of Concern Assoc. with Project Activities (See Section 3.3 of TGM) Sediment Nutrients Metals Pesticides Oxygen Demanding Substances Toxic Organics Oil & Grease Bacteria Trash and Debris Street, road, or highway X X X X X
Agricultural Land X X
[fill in if necessary]
*Denote potential pollutant with "x"
Receiving Waterbody Listings (See Section 3.3 of TGM)
Distance to
Project (ft)
Revolon Slough & Beardsley Wash (Calleguas Creek) 13200.00 Bacteria, Salts, Trash, Metals, Selenium, Nutrients,
Pesticides, PCBs, Sediment
[fill in if necessary]
ST-5006 Pleasant Valley Bike Lanes
Activity / Potential Land Uses
Potential Pollutant*
Receiving Water Body
(watershed indicated in parentheses) Constituent Grouping [2]

Page 794 of 978 ends

Project Name:

ROADWAY PROJECTS: PERFORMANCE STANDARDS
[1] Additional gudiance on performance standards can be found in Section 2.2 of the TGM.

Project Name:

ROADWAY PROJECTS: BMP SIZING
Y/N
Y
A completed copy of the applicable “BMP Sizing Worksheet(s)” for the project’s stormwater BMP(s) from Appendix E of the Technical Guidance Manual is included as an attachment. [1] Applicant should enter post-project impervious cover prior to accounting for green roof and hydrologic source control (HSC) credits. Volume reduction provided by green roofs and HSCs are accounted for implicitly in the sizing calcuations for BMPs by assuming the roof area covered by a green roof or the area draining to a HSC is pervious rather than impervious when caluclating the runoff coefficient for the site. Green roofs and HSCs are not required to be considered for all project locations and types. In order to obtain credit, Green Roofs and HSCs must be designed as specified in the TGM. Additional detail on Green Roofs (ET-1) and HSCs (ET-2) can be found in Section 6 of the TGM. [2] If a waterbody is listed for "toxicity" and the cause and/or contribution to toxicity is known, then the consituent group known to contribute to toxicity are listed here (in lieu of listing "toxicity")
Tree canopy is added by planting or preserving trees and shrubs N/A
Not applicable to project site. Roadway constrained by
agricultural land, utilities, and earthen ditch.

ST-5006 Pleasant Valley Bike Lanes
Roadway projects must utilize retention or biofiltration BMPs as specified in the TGM (INF-1-7, RWH-1, ET 1- 2, or BIO-1- 5). BMPs must be sized to meet the SQDV or SQDF. See Section 2, Step 7 of the for guidance on calculating the SQDV and SQDF.

BMP Sizing
Street width is minimized Y
The street width has been minimized to the appropriate
minimum for maintaing traffic flow and public safety.

Porous pavement or pavers are used for low traffic roadways, on-street parking, shoulders or sidewalks N/A
Not applicable to project site. Roadway constrained by
agricultural land, utilities, and earthen ditch.

Retention and/or biofiltration BMPs are sized to capture and treat SQDV or the SQDF.

Also see BMP Sizing below
Y
BMP sized to treat Stormwater Quality Design Flow (SQDF).

ST-5006 Pleasant Valley Bike Lanes
► Street, roadway, highway,and freeway projects that construct 10,000 square feet or more of impervious surface area must incorporate the USEPA guidance, "Managing Wet Weather with Green Infrastructure: Green Streets", to the maximum extent practicable.
► Identify and describe the performance standards included within the proposed site in the table below.

Performance Standard [1] Included?
Y/N/NA Brief description of Performance Standard

Page 795 of 978 ends

Project Name:

ADDITIONAL REQUIRED SUBMITTALS
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Technical Infeasibility Analysis – if Retention BMPs cannot be used, the applicant must submit a site-specific analysis showing technical infeasibility as described in Section 3.2 of the TGM.

Technical infeasibility may include some (or all) of the components submitted with soil, groundwater and/or geotechnical reports. Technical infeasibility must also account for Rainwater Harvesting. Rainwater Harvesting is not required to be used if the available demands do not meet the volume required for 80% capture using a 72-hour drawndown time (See RWH-1 in Section 6 of the TGM for more detail).

Soil Type Information (may include site specific analyses, available geologic or geotechnical reports and/ or the Ventura Hydrology Manual Soil Map zoomed into site level) Groundwater Information (may include available groundwater data, site specific redoximorphic analytical/groundwater monitoring results, or known groundwater impacts such as contaminated sites registered with the State Water Board)
Maintenance Plan (Use City of Camarillo Template available for download at www.cityofcamarillo.org in "forms")
ST-5006 Pleasant Valley Bike Lanes
Submit $2,000 fee deposit, and 1 original & 1 copy of PCSMP as well as an electronic copy with the Excel spreadsheet along with the following submittals to City of Camarillo Public Works Dept.:

Site map that includes:
o Property boundary
o Major roadways or landmarks
o Scale and north arrow
o Drainage areas
o Surrounding land uses
o Presence of Environmentally Sensitive Areas
o Open space preservation areas
o Impervious areas
o Natural hydrologic features
o Location of discharge(s)
o Existing and planned utilities
o Topography (including steep slopes)
o Key activities such as outdoor material storage, parking, food preparation, etc. o Potential pollutant areas (e.g., fueling island)
o Location of nearby (within 2,000 ft of development project) bus or train station(s) o Location and type of source control measures
o Location and type of stormwater BMPs
BMP Sizing Worksheet(s) (see Appendix E of TGM); design specifiations and details must also be provided for Green Roofs and Hydrologic Source Controls (ET-1 & 2) Stormwater Treatment Device Access and Maintenance Agreement (Use City of Camarillo Template available at www.cityofcamarillo.org in forms)

Page 796 of 978 ends

Yes
N/A
Geotechnical Reports (may include site specific analyses with information on collapsible soils, expansive soil, liquefaction, or groundwater mounding analysis) Rainwater Harvesting - Include calculations and justification for rainwater harvesting demand. Section 3.2 for guidance of the TGM.

Page 797 of 978 ends

229-0-020-145 229-0-020-155 230-0-052-150 NORTH LEGEND

Page 798 of 978 ends

NORTH LEGEND

Page 799 of 978 ends

Pleasant Valley Road
1 Ventura County Technical Guidance Manual, page 2-6
2 Ventura County Technical Guidance Manual, Section 2.8, page 2-27 3 Ventura County Technical Guidance Manual, Section 2.8, page 2-30 4 Ventura County Road Standards, Section 4.2, page 12
Water Quality Design
The following is an overview of the analysis completed as part of the stormwater quality design, sizing of the modular wetlands and adjacent drainage inlets. If found acceptable, a revised final drainage memorandum will be submitted encompassing the complete analysis.

The water quality design calculations are based on the Ventura County Technical Guidance Manual for Stormwater Quality Control Measures, Manual Update 2011, Errate Update 2018 (Larry Walker and Associates, Geosyntec, June 2018) [TGM], while the roadway drainage design is based on the Ventura County Road Standards.

The warranty for the proposed modular systems is 1 year provided by Contech and will be one year or greater for approved equal.

TGM Step 1c: Roadway Projects
Minimum requirements for the impervious area within the Right-of-Way associated with streets, roads, highways, and freeways are as follows: 1) Provide Retention BMPs or Biofiltration BMPs sized to capture and treat the Stormwater Quality Design Volume (SQDV) or the Stormwater Quality Design Flow (SQDF) (see Step 7 for guidance on calculating the SQDV and SQDF).1 TGM Step 7: Apply Treatment Control Measures
Calculation Procedure
1) Determine the area from which runoff must be retained or captured and treated (Aproject).
a. Attached
b. 6.23 acres
The project area will not maintain the existing grade and thus is not considered routine maintenance. The original crown road is being revised to slope towards the northern channel. The southern channel is being removed to accommodate the widening for the bicycle lanes and buffers.
2) C = 0.95*imp + Cp (1-imp) (Equation 2-14)2
C = 0.95*1.0 + 0.1(1-1) = 0.95
Where:

C = runoff coefficient (equals 0.95 for impervious surfaces) imp = impervious fraction of watershed
Cp = pervious runoff coefficient, determined based on soil type using table below [Ventura County Hydrology Manual (2017)]:

Page 800 of 978 ends

Pleasant Valley Road
1 Ventura County Technical Guidance Manual, page 2-6
2 Ventura County Technical Guidance Manual, Section 2.8, page 2-27 3 Ventura County Technical Guidance Manual, Section 2.8, page 2-30 4 Ventura County Road Standards, Section 4.2, page 12
Figure 1 Table 2-3 TGM
3) Stormwater Quality Design Flow (SQDF)
𝑆𝑄𝐷𝐹 = 𝐶 ∗ 𝑖 ∗ 𝐴 (Equation 2-16)3
𝑆𝑄𝐷𝐹 = 0.95 ∗ 0.2 ∗ 6.23 = 1.18 𝑐𝑓𝑠
Where:

SQDF = flow in cubic feet per second (cfs)
C = runoff coefficient, calculated by Equation 2-14 above I = average rainfall intensity (inches/hour) for a duration equal to the time of concentration of the watershed [equal to 0.2 in/hr for method (1)] Aproject = drainage area of the tributary catchment (acres)* *Sizing is based upon the post-project impervious surface area to meet the MEP 4) Modular Wetland Design
a. Treatment Design Flow
i. SQDF = 1.18 cfs
ii. Treatment Flow Provided = 1.239 cfs
iii. System designed with the largest modular wetland systems that will fit in the project location and that they are sized to the maximum extent practicable.
iv. Refer to the Contech standard details for treatment flow based on size of module.
b. 4’ x 8’ Modular Wetland Sizing [3]
i. Modified Depth Treatment Flow = 0.075 cfs
c. 4’ x 21’ Modular Wetland Sizing [6]
i. Modified Depth Treatment Flow = 0.169 cfs

Page 801 of 978 ends

Pleasant Valley Road
1 Ventura County Technical Guidance Manual, page 2-6
2 Ventura County Technical Guidance Manual, Section 2.8, page 2-27 3 Ventura County Technical Guidance Manual, Section 2.8, page 2-30 4 Ventura County Road Standards, Section 4.2, page 12
Refer to the Drainage Report for the SQDF and Q10 peak flow calculations per inlet and sizing of the curb inlets adjacent to the modular wetland systems.

Drainage Area
Size of
Modular
Wetland
Modified Depth
Modular Wetland
Treatment Flow
(CFS)*
Modular
Wetland Cost
A.1 4' x 8' 0.075 $35,000
A.2 4' x 21' 0.169 $60,000
A.3 4' x 21' 0.169 $60,000
A.4 4' x 21' 0.169 $60,000
A.5 4' x 21' 0.169 $60,000
A.6 4' x 21' 0.169 $60,000
A.7 4' x 8' 0.075 $35,000
A.8 4' x 8' 0.075 $35,000
A.9 4' x 21' 0.169 $60,000
Total 4' x 8' 3 1.239 $465,000
Total 4' x 21' 6
*The treatment flow provided in this document is an estimate of the treatment capacity for a modified modular wetland system. A full design for the modified system must be prepared during construction by the manufacturer once selected. This document will be amended with the manufacturer plans, specifications, and actual treatment flow. 1yr 1hr Storm Trash Capture Calcs
Drainage
Area Q C I A
A1 0.134 0.95 0.44 0.32
A2 0.314 0.95 0.44 0.75
A3 0.497 0.95 0.44 1.19
A4 0.706 0.95 0.44 1.69
A5 0.196 0.95 0.44 0.47
A6 0.084 0.95 0.44 0.2
A7 0.025 0.95 0.44 0.06
A8 0.092 0.95 0.44 0.22
A9 0.556 0.95 0.44 1.33
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Purchase a license to generate PDF files without this notice.

Page 802 of 978 ends

B
B
A
A

SECTION A-A

CHANNEL / MODULAR WETLAND DETAIL
1"=2'

SECTION B-B

TYPICAL RECTANGULAR CHANNEL SECTION
1"=2'
CHANNEL PROFILE OPTION AT HEAVY SEDIMENT LOCATIONS (DRIVEWAYS 1, 3) 1"=3'

CHANNEL WITH MODULAR WETLAND TYPICAL SECTION AND ADJACENT DRAINAGE INLET EXHIBIT

CHANNEL PROFILE
1"=3'

CHANNEL LAYOUT
1"=3'

NNEL PROFILE
1"=3'

NNEL LAYOUT
1"=3'
(DRIVEWAYS 1, 3)
FOR REFERENCE ONLY. REFER TO BID SET PLANS FOR FINAL CONSTRUCTION DETAILS AND SPECIFICATIONS.

Page 803 of 978 ends

STANDARD DETAIL

STORMWATER BIOFILTRATION SYSTE
MWS-L-4-21- 3'-0"-V

FOR PATENT INFORMATION, GO TO
www.ContechES.com/IP

SITE SPECIFIC DATA

PLAN VIEW

ELEVATION VIEW

LEFT END VIEW

RIGHT END VIEW

GENERAL NOTES

INSTALLATION NOTES

REFER TO THE BID SET PLANS FOR FINAL
CONSTRUCTION DETAILS AND SPECIFICATIONS.
* To be revised once modified design is prepared
by the manufacturer.

Page 804 of 978 ends

PLAN VIEW

ELEVATION VIEW

RIGHT END VIEW

LEFT END VIEW

SITE SPECIFIC DATA

GENERAL NOTES

INSTALLATION NOTES

STANDARD DETAIL

STORMWATER BIOFILTRATION SYSTEM
MWS-L-4-8-V

FOR PATENT INFORMATION, GO TO
www.ContechES.com/IP REFER TO THE BID SET PLANS FOR

FINAL CONSTRUCTION DETAILS AND
SPECIFICATIONS. .
* To be revised once modified design is prepared
by the manufacturer.

Page 805 of 978 ends

0.115 OFFLINE N/A N/A N/A PEDESTRIAN 3.4 2.0 1.0 0.115 * PRELIMINARY NOT FOR CONSTRUCTION Know what'sbelow.

Callbefore you dig.

PLEASANT VALLEY ROAD

BIKE LANES
39 DETAIL SHEET - FOREBAY
D-6
27 PLAN - CHANNEL LAYOUT WITH 4'X21' MODULAR WETLAND
PLAN - CHANNEL LAYOUT WITH 4'X8' MODULAR WETLAND

CHANNEL PROFILE
C-18090

PLAN - CHANNEL TO CULVERT TRANSITION
*SEE SHEET D-7 FOR CHANNEL TO CULVERT TRANSITION SECTION LEGEND

Page 806 of 978 ends

PLAN VIEW

RIGHT END VIEW

LEFT END VIEW

ELEVATION VIEW
Know what'sbelow.

Callbefore you dig.

PLEASANT VALLEY ROAD

BIKE LANES
39 1/15/26

DRAINAGE DETAIL
DD-1
29 PLAN VIEW

ELEVATION VIEW

LEFT END VIEW

RIGHT END VIEW

INSTALLATION NOTES
C-18092

Page 807 of 978 ends

Page 808 of 978 ends

Stormwater Treatment/Mitigation Device
Operations & Maintenance Plan
Address: ________________________________________
Project No.: ___________________________________
Date: ______________
Prepared for:

OWNER: (name & Address)
Prepared by:

Name:

Company:

Mailing Address:

Phone No.:

City of Camarillo
601 Carmen Dr #6034,
Camarillo, CA 93010
Nicole Dias, PE Kimley-Horn 660 S Figueroa St #2050, Los Angeles, CA 90017 (213) 261-4040 Pleasant Valley Road, Camarillo, CA 93010 05/24/2024 ST-5006

Page 809 of 978 ends

Page 2 of 17 ends

STORMWATER TREATMENT OPERATIONS & MAINTENANCE PLAN
Project Address & No.

INTRODUCTION
This Stomwater Treatment Operations and Maintenance Plan (O&M) has been prepared for the developments located at the above address in Camarillo, California.

This O&M has been prepared in conformance with the guidelines set forth in Appendix I (Maintenance Plan Guidelines & Checklists) of the Technical Guidance Manual for Storm Water Quality Control Measures.

Pleasant Valley Road, Camarillo, CA 93010 094169102

Page 810 of 978 ends

Page 3 of 17 ends

1. SITE MAP
Below are the guidelines for the required site map (insert here or include as an attachment). a) Provide a site map showing boundaries of the site, acreage and drainage patterns/contour lines.

Show each discharge location from the site and any drainage flowing onto the site. Distinguish between soft and hard surfaces on the map.
b) Identify locations of existing and proposed storm drain facilities, private sanitary sewer systems and grade-breaks for purposes of pollution prevention.
c) With legend, show locations of expected sources of pollution generation (outdoor work and storage areas, heavy traffic areas, delivery areas, trash enclosures, fueling areas, industrial clarifiers, wash-racks, etc). Identify any areas having contaminated soil or where toxins are stored or have been stored/disposed of in the past.
d) With legend, indicate types and locations of stormwater management control measures which will be built to permanently control stormwater pollution. Distinguish between pollution prevention, treatment, sewer diversion, and containment devices.

See Appendix A.

Page 811 of 978 ends

Page 4 of 17 ends

2. BASELINE DESCRIPTIONS
(Insert description of project).

2.1. O&M Implementation Responsibility
List the persons responsible for operation and maintenance of the stormwater management control measures onsite. Include phone numbers and addresses. Use table below.

Table 2-1 O&M Implementation Responsibility
Company Contact and Telephone Number Responsibility

2.2. Financing Mechanism & Estimated Annual Maintenance Cost Identify the intended method of providing financing for operation, inspection, routine maintenance and upkeep of stormwater control measures.

Estimated Annual Maintenance Cost for Storm water Treatment Device: $_________________

2.3. Permanent Stormwater Control Measures
This facility is equipped with the following permanent stormwater control measures.

List all permanent stormwater control measures. Provide a brief description of stormwater management control measures selected and if appropriate, fact sheets or additional information. $6,000-$8,000 annually
combined for nine devices
Financing for operation, inspection, routine maintenance and upkeep of stormwater control measures shall be the responsibility of the City of Camarillo.

The project proposes a minor roadway widening project along a 1.6-mile section of Pleasant Valley Road and reconstruction of the roadway cross slopes from a crowned roadway to a superelevated roadway which will slope towards the northern channel to accommodate the widening for the Class II bicycle lanes and buffers. The bicycle lanes will connect bicyclists from Las Posas Road to west of Fifth Street. The project includes the reconstruction of the severely eroded embankments along the earthen drainage ditch on the north side of Pleasant Valley Road. To mitigate storm water quality, 9 Modular Wetland Systems were proposed. Discharge will enter on-grade curb inlet catch basins located along the stretch of Pleasant Valley Road and flow through their respective Modular Wetland System. Flows will then be routed to the reconstructed northern drainage channel before ultimately discharging into Revolon Slough (Calleguas Creek Reach 4).

2.1. O&M Implementation Responsibility
City of Camarillo Thang Tran
805-388-5345
Maintain permanent storm
water BMPs implemented
on-site. Modular Wetland
Systems [9]
Capture runoff and debris and then filters runoff
from known pollutants BMP Description Fact Sheet

Page 812 of 978 ends

Page 5 of 17 ends

2.4. Inspection and Maintenance Procedures
As appropriate for each stormwater control measure provide the below:
a) A written description and check list of all maintenance and waste disposal activities that will be performed. Distinguish between the maintenance appropriate for a 2-year establishment period and expected long-term maintenance. For example, maintenance requirements for vegetation in a constructed wetland may be more intensive during the first few years until the vegetation is established. The post-establishment maintenance plan should address maintenance needs (e.g., pruning, irrigation, weeding) for a larger, more stable system. Include maintenance performance procedures for facility components that require relatively unique maintenance knowledge, such as specific plant removal / replacement, landscape features, or constructed wetland maintenance. These procedures should provide enough detail for a person unfamiliar with maintenance to perform the activity, or identify the specific skills or knowledge necessary to perform and document the maintenance.
b) A description of site inspection procedures and documentation system, including record-keeping and retention requirements.
c) An inspection and maintenance schedule, preferably in the form of a table or matrix, for each activity for all facility components. The schedule should demonstrate how it will satisfy the specified level of performance, and how the maintenance / inspection activities relate to storm events and seasonal issues.
d) Identification of the equipment and materials required to perform the maintenance.

Inspection and maintenance procedures for the stormwater treatment devices are presented in the tables below. Inspection and maintenance activities are discussed in Section 6.

Note: An inspection checklist from the Technical Guidance Manual Appendix I should be included for each device. Below is a list of devices that have an inspection checklist. a) Bioretention/Planter Box
b) Vegetated Swale Filter
c) Vegetated Filter Strip
d) Sand Filter
e) Infiltration BMPs
f) Permeable Pavement
g) Constructed Treatment Wetland
h) Wet Retention Basin
i) Dry Extended Detention Basin
j) Proprietary Devices
Table 2-2 Inspection
Area Item Frequency
Equipment/Materials
Necessary
Safety
Equipment
Catch Basin
Signage
Inspect the catch basins to
ensure that they are labeled
with the wording “Don’t Dump
– Drains to Creek.”
Quarterly None None
Catch Basins Inspect the catch basins for
debris and sediment build up.

Quarterly None May require use
of Gas Detector
and confined
space training
certification

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Covered
Trash
Enclosures
Trash Enclosures will be kept
free of debris. No debris shall
be washed to the storm drain.

Monthly
Insert other
PostConstruction
Mitigation
Controls
Refer to manufacturer's
guidelines.

Refer to manufacturer's
guidelines.

Winwater
Pump
System
Safety glasses,
gloves, long
pants, and
sturdy
work shoes
Flashlight,
Manhole hook,
tape measure
Observe inlet and outlet
Bi-annually pipes for damage and
obstructions. Inspect
joint sealant for
damage.

Flexstorm
Inlet Filters
Observe inlet filter for
accumulated sediment and
debris.

Monthly
industrial vacuum Refer to manufacturer's
guidelines.

Oldcastle
Flogard Inlet
Filter
Monthly
Bi-annua
Modular Wetlands
Linear Maintenance
Form, Flashlight,
Access Cover Hook,
Ratchet and 7/16"
Socket, Vaccum
Assisted Truck with
Pressure Washer,
Replacement
BioMediaGREEN (If
Required) Inspect the catch basins for
None debris and sediment build up.

Modular
Wetland
System

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Table 2-3 Maintenance
Area Item Frequency
Equipment/Materials
Necessary
Safety
Equipment
Catch Basin
Signage
Replace signage when worn or
wording is no longer legible
When
deemed
necessary
by
inspection
Replacement plaque
(available from the city
at 805-383-5659)
Safety glasses,
gloves, long
pants, and sturdy
work shoes
Catch Basins Remove debris and clean as
necessary
Quarterly May require use of
vacuum or vactor truck
and gas detector.

Gas detector and
confined space
training
certification may
be required
Covered Trash
Enclosures
Trash Enclosures will be kept free
of debris. No debris shall be
washed to the storm drain.

Monthly
Street &
Parking Lot
Sweeping
Private roads and parking lots shall
be maintained free of litter/debris.

Monthly Street Sweeper Debris must be
disposed of
properly and not
swept into storm
drains
Insert other
PostConstruction
Mitigation
Controls

2.5. Housekeeping Procedures
As appropriate list appropriate housekeeping practices. See http://www.vcstormwater.org/index.php/programs/business for a list of clean business fact sheets (which can be referenced or attached to your O&M plan.

Refer to manufacturer's
guidelines.

Flexstorm
Inlet Filters
Observe inlet filter for
accumulated sediment and
debris.

Monthly
industrial vacuum
each filter to be removed
and vacuumed dry. Replace
if any damage is noted
Replace as
needed,
Clean 3
times a year
or after
every storm
event
Refer to manufacturer's
guidelines.

Oldcastle
Inlet filter
Replace
and clean
as needed

Flexstorm
Inlet Filters
Observe inlet filter for
accumulated sediment and
debris.

Oldcastle
Inlet filter
Replace
and clean
as needed
Modular
Wetland
System
Stormtech
MC-3500
As needed JetVac truck Sediment to be flushed
out of Isolator rows
when necessary.

Safety glasses,
gloves, long pants, and
sturdy work shoes
Safety glasses,
gloves, long
pants, and
sturdy
work shoes
Winwater
Pump
System
Safety glasses,
gloves, long
pants, and
sturdy
work shoes
hoist, JetVac
truck
Remove pump and Bi-annually piping components.
remove all floating
debris and sediment.

Flexstorm
Inlet Filters
Observe inlet filter for
accumulated sediment and
debris.

Monthly
industrial vacuum
each filter to be removed
and vacuumed dry. Replace
if any damage is noted
Replace as
needed,
Clean 3
times a year
or after
every storm
event
JetVac truck
shovel, rake broom
Cleaning of the trash rack. Replacement of
the soil media once its service life has been
reached. Remove and replace vegetation as
needed.

Bi-annually or
as needed per
inspection

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3. SPILL O&M
These spill response procedures have been developed to respond to potential spills at the site.

The below information should be included in the Spill Plan. a) Provide emergency notification procedures (phone and agency/persons to contact) b) As appropriate for site, provide emergency containment and cleaning procedures. c) Note downstream receiving water bodies or wetlands which may be affected by spills or chronic untreated discharges.
d) As appropriate, create an emergency sampling procedure for spills. (Emergency sampling can protect the property owner from erroneous liability for downstream receiving area clean ups).

Note: The below information should be verified to ensure all numbers are accurate.

3.1. Emergency Notification Procedures
If there has been a release of hazardous material, follow the notification procedures presented below.

ON SITE SPILLS
Immediately contact the O&M Coordinator listed in Table 2-1.

If the O&M Coordinator is unavailable, immediately notify the following agencies. If the O&M Coordinator is available, he should make these notifications.

Local emergency response: 911
Ventura County Spill Hotline: (805) 320-6244
City of Camarillo Illicit Discharge Spill Hotline: (805) 388-5338 State Office of Emergency Services (OES): (805) 852-7550 Ventura County Environmental Health
Department:

Business hours: (800) 654-2813
After hours: 911
State Regional Water Quality Control Board:
(Ask for someone in technical support)
(213) 576-6600
If waste oil is spilled, contact the DTSC:
(Department of Toxic Substance Control)
Business hours: (800) 852-7550
After hours: (800-852-7550
FOR SPILLS RUNNING OFF SITE – If a reportable quantity or more flows from the site:

1. Follow sequence of actions noted above.

2. Notify the National Response Center at: (800) 424-8802

FOR SPILLS THAT THREATEN NAVIGABLE WATER

1. Follow sequence of actions noted above.

2. Notify United States Coast Guard at: (562) 980-4444

3. SPILL O&M
These spill response procedures have been developed to respond to potential spills at the site.

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Information to be Included in Oral Notification
When reporting to government agencies is required, notification should be made as soon as possible.

Below are possible questions that the agency may ask.

Document all reports to regulatory agencies. Ask the name and position of person you have contacted and note the agency and the time of your call. Write this information down.

1. Give the facility name, address, and phone number as well as your name and position.

2. Date and time of the spill
a. Time or estimated time spill began
b. Duration of spill or if it is continuing
c. Location of spill

3. Spill information:
a. Materials spilled.
b. Volume or estimated volume spilled.
c. Has spill entered storm drain or navigable waters? If so, how much? Is there potential for the spill to enter storm drain or navigable waters? d. The source of the discharge.
e. A description of all affected media (e.g. water and/or soil). f. The cause of the discharge
g. Damages or injuries caused by the discharge.

4. Response measures taken:
a. For containment.
b. For cleanup.
c. Has the source been stopped?
d. Will as evacuation be required?
e. Name or individuals and organizations who have been contacted.

5. Weather:
a. Raining?
b. Air temperature?
c. Wind speed and direction?
Do not wait until all information is known to contact agencies.

Do not hang up until all questions are answered.

3.2. Spill Response
The following spill response procedures provide guidelines for use by those on duty to respond to releases. They are not meant to supplant the use of common sense and good judgment during emergencies. Do not contact any spilled material unless wearing proper personal protective equipment per the MSDS.

1. NOTIFY SUPERVISOR. As soon as it is safe to do so, notify your supervisor. a. If the spill involves fire, the supervisor will call 911 immediately. b. The supervisor will notify the O&M Coordinator and take charge until the O&M Coordinator arrives.
c. The O&M Coordinator will take charge of the situation on arrival.

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2. EVACUATE the immediate area.

3. AID any persons that have been injured or contaminated or are in danger of being injured or contaminated. Do not put yourself in danger trying to save someone else. If someone is contaminated with material, avoid contacting that person.

4. STOP FLOW, if it is safe to do so. Stop the source of the spill and contain the material that has already been spilled. Do this only if it can be accomplished safely without endangering life or property. Minimizing the amount of material spilled reduces the potential for discharge and the amount of clean up necessary.

5. ALERT OTHERS in the area to stay clear.

6. ELIMINATE IGNITION SOURCES in the area.

7. CONTAIN SPILL if it has, or is about to, enter storm drains. Place absorbent material into position to contain the spill. Care should be used to prevent the spill from leaving the site or entering sewers and storm drains.

8. CLEAN UP spilled material with absorbent materials, dikes, etc. Contact contractors (see Table 3- 1) for assistance if necessary.

9. NOTIFY personnel and agencies presented in Section 3.1.

O&M Coordinator Responsibilities
• In charge of overall incident response
• Calling emergency numbers as required (see Section 3.1) • Notifying people in the area and advising them to stay away from the spill • Coordinating with outside emergency response and providing technical information • Reporting emergency incidents to appropriate agencies • Authorizing non-emergency cleanup measures
• Ensuring compliance with applicable federal, state, and local rules and regulations Response Equipment – External Response Equipment
Contractors may be contacted to provide the following spill response equipment (see below):
• Bins and equipment for used absorbent removal
• Vacuum truck to collect and remove spilled material
Table 3-1 Spill Response Contractor(s)
Name Phone Number Address
Assistant Street
Superintendent
383-5639
823-3965 Street Superintendent 388-5378
405-7532 Public Works Director 383-5642 City Manager 388-5307 Spill Response Contractor(s) Refer to Appendix E for "Standard Operating Procedures for Hazardous Materials Spills or Containers of Unknown Substances on Public Right-of-Way."

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3.3. Spill Cleanup Procedures
Material generated during spill response activities must be disposed of in accordance with applicable federal, state, and local regulations.

There may be various types of waste generated during response activities. Below is a list of common materials and disposal requirements.
• Free product: if there is a large amount of this material, a vacuum truck should be contacted to collect and haul it to a licensed treatment, storage, and disposal facility for recycling or disposal.

Small spills may be cleaned up using absorbent material. • Soiled rags, booms, and absorbent material should be drummed up and sent to a licensed treatment, storage, and disposal facility for disposal.

3.4. Receiving Water Bodies
Material that enters storm drains at the site will travel through the storm drain system which discharges into Calleguas Creek, Revolon Slough/Beardsley Wash or Conejo Creek (circle applicable water body).

3.5. Sampling Plan
During a spill, it may be possible for contaminated material to enter the storm drain. If contaminated material enters the storm drain, it may be prudent to take samples and to document the amount of material released.

If sampling is performed, samples should be taken at the storm drain inlet where contaminated material is entering.

The samples must be sent to a state-certified laboratory for analysis. The following procedures will be used for taking the samples:
a. Collect samples in sampling containers. Ensure that the sample is free of excess debris (i.e. leaves, paper fragments, etc.). Fill the container to the top. b. The closed sample containers may be sealed with custody tape, which can be obtained from the test laboratory with the sample bottles. Do not seal the bottles with other types of tape (scotch, duct, cellophane, etc.) as organic material from the tape may contaminate the sample. c. Label samples with the following information:
i. Company Name v. Sample Description
ii. Date Sampled vi. Preservative
iii. Time Sampled vii. Analysis Required
iv. Collection Point viii. Special Requirements
d. The laboratory should be instructed to analyze for the constituents, which may have been discharged. In the event of an oil spill, the sample should be analyzed for “Oil & Grease.” e. Complete a chain-of-custody form recording pertinent information including the information listed above and the signature of the person taking the sample. The test laboratory will provide the chain-of-custody forms.
f. If possible, chill the samples to 4°C (40°F) until the samples are delivered to the laboratory. Do not freeze the samples.
g. Send the samples to a state-certified laboratory, or call the laboratory, or call the laboratory to have the samples picked up.

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4. FACILITY CHANGES
Note: Operational or facility changes which significantly affect the character or quantity of pollutants discharging into the stormwater management control measures will, require modifications to the Maintenance Plan and/or additional stormwater control measures. List the cases in which this O&M Plan will be amended below.

This O&M will be amended:
a. EXAMPLE: When there is a change in operations which may significantly affect the character or quantity of pollutants discharging from the site, or
b. EXAMPLE: When plans are made to modify the approved treatment devices.

Minor administrative changes to the O&M (changes in names, phone numbers, etc.) may be made by the O&M Coordinator.

Amendments to the O&M will be noted on the Amendment Log in Appendix B.

Minor administrative changes to the O&M (changes in names, phone numbers, etc.) may be made by the O&M Coordinator.

Amendments to the O&M will be noted on the Amendment Log in Appendix B.

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Camarillo City CouncilMay 13, 2026

Camarillo City Council
May 13, 2026