Gardena City Council
May 24, 2022

5.6c) Answer the following questions regarding Public Hotline and Training [VI.D.10.d and VI.D.10.f]

Yes No
Did you maintain or provide access to a hotline to enable the public to report illicit discharges/connections? ☒ ☐
Did you continue to implement a training program regarding the identification of IC/IDs for all municipal field staff, who, as part of their normal job responsibilities (e.g., street sweeping, storm drain maintenance, collection system maintenance, road maintenance), may come into contact with or otherwise observe an illicit discharge or illicit connection to the MS4?

☒

☐

5.6d) Additional Information. If desired, provide additional information regarding implementation of the Illicit Connections and Illicit Discharges Elimination Program.

The reporting of IC/ID is addressed through the City of Gardena (310) 217-9528 or (888) CLEANLA. The City of Gardena has also instituted “Gardena Direct,” an Accela Customer Relationship Management (CRM) application available at http://iframe.publicstuff.com/#?client_id=1000006, which facilitates the reporting of illicit discharges, illicit connections, and other pollution source control issues.

City of Gardena Individual Form
Reporting Year 2020-21

6 Stormwater Control Measures Summary
Complete the following items in this section.

If the information on stormwater control measure implementation requested in the following section will be included in a Watershed Form submitted by the Permittee, the Permittee may reference the Watershed Form and skip those items. Aside from the calculation of Effective Impervious Area (Section 6.1) and the Summary of Projects that Retain Runoff (Section 6.2), items in this section cover projects that are not part of the Planning and Land Development Program.

The tables within this section outline minimum information for reporting. The Permittee may reformat the sections regarding projects completed in the reporting year to include additional project descriptions and information (e.g. pictures, maps, funding information, etc.).

If any of the requested information cannot be obtained, please note in Section 11.

6.1 Effective Impervious Area and 85th Percentile, 24-Hour Runoff Volume [Attachment E, XVIII.A.1] (if available):

Summarize the estimated cumulative change in percent EIA since the effective date of the Permit (i.e. 12/28/2012) for the entire area covered by the WMP/EWMP and, if possible, the estimated change in the stormwater runoff volume during the 85th percentile, 24-hour storm event for the entire area covered by the WMP/EWMP.

We have preliminary estimated an EIA value of approximately 74%, however the City appreciates and will utilize the alternative cumulative change in EIA estimate that was offered to Permittees in the May 25, 2017, LARWQCB reporting guidance memorandum.

6.2 Sum mary of Projects that Retain Runoff (including New and Redevelopment Projects); Complete the summary tables below.

Table 6a: Summary of Projects that Retain Runoff Completed in the Reporting Year

Receiving Water
and/or

WMP/EWMP
Group
Number of New
Development/Re-
development Projects
Completed in
Reporting Year
Number of Other
Projects
Designed to
Intercept Runoff
Completed in
Reporting Year

Area Addressed by
Projects
[acres]

Total BMP Retention
Capacity of Projects
[acre-feet]
Dominguez
Channel 3 0 6.23 0.438
TOTAL 3 0 6.23 0.438

Table 6b: Cumulative Summary of Projects that Retain Runoff Completed since the Permit Effective Date

Receiving Water
and/or

WMP/EWMP
Group
Number of New
Development/
Re-development
Projects
Completed Since
12/28/2012
Number of Other
Projects
Designed to
Intercept Runoff
Completed
Since 12/28/2012

Area
Addressed
by Projects
[acres]
Total BMP
Retention Capacity
of Projects
Completed Since
12/28/2012 [acre-
feet]
Est. Total
Runoff Volume
Retained Onsite
for the
Reporting Year
[acre-feet]19
Dominguez
Channel (Above
Vermont Ave.)

7 9

28.59 0.868

0.33 TOTAL 7 9 28.59 0.868 0.33

19 Assuming 90% of 4.72” recorded at the ALERT Hollypark Rain gauge was captured in Project BMPs.

City of Gardena Individual Form
Reporting Year 2020-21

6.3 Projects Designed to Intercept Stormwater Runoff Completed during the Reporting Year (excluding New Development and Redevelopment Projects): Complete the table below for projects designed to intercept stormwater runoff completed in the reporting year. If needed, information unsuitable for the table or additional information on projects may be provided in the space below table.

Table 6c: Projects Designed to Intercept Runoff Completed in the Reporting Year Receiving Water
and/or

WMP/EWMP
Group

Name of
Project(s)

Type of
Project

Completion
Date
Length (if
Green
Street)
[miles]
Drainage
Area of
Project
[acres]
Total BMP
Retention
Capacity20
[acre-feet]
Dominguez
Channel Not Applicable Choose an
item.

Not
Applicable
Not
Applicable
Not
Applicable
Not
Applicable

The City of Gardena is investigating use of the Willows Wetlands as a regional infiltration control to address water quality issues and to facilitate groundwater recharge efforts.

6.4 Riparian Buffer and Wetland Restoration Projects: Complete the table below for any riparian buffer or wetland restoration projects completed in the reporting year.

Table 6d: Riparian Buffer/Wetland Restoration Projects Completed Receiving Water and/or
WMP/EWMP Group Name of Project Completion
Date Description of Project21
Dominguez Channel Gardena Willows
Wetland Preserve Ongoing Exotic/Invasive species control and removal, public education, and establishment of volunteer program

6.5 Status of Multi-Year Efforts [Attachment E, Part XVIII.A.1.i]: Provide the status of multi-year efforts, including TMDL implementation (not including Trash TMDLs) that were not completed in the current year and will continue into the subsequent year(s). For multi-year efforts, report on progress towards future milestones related to multi-year projects.

Include the status of the project, which includes the status with regard to standard project implementation steps. These steps include, but are not limited to, adopted or potential future changes to municipal ordinances to implement the project, site selection, environmental review and permitting, project design, acquisition of grant or loan funding and/or municipal approval of project funding, contractor selection, construction schedule, start-up, and effectiveness evaluation (once operational), where applicable.

If applicable, for green streets implementation, Permittees shall report on progress toward a structured approach identifying a sufficient number of green streets projects to meet compliance milestones (e.g., a green streets master plan).

Also, include the following information:
• Name
• Receiving Water
• Project Type
• Location / Latitude and Longitude
• Permittee(s) Involved
• Status
• Expected Completion Date

The City of Gardena is not formally affiliated with a WMP/EWMP. The City anticipates revisiting this decision following the July 23, 2021 adoption of the fifth term permit.

20 If project not designed to retain stormwater, mark “N/A.” 21 For riparian buffer projects include width, length and vegetation type; for wetland restoration projects include acres restored, enhanced or created
City of Gardena Individual Form
Reporting Year 2020-21

6.6 Effectiveness Assessment of Stormwater Control Measures [ Attachment E – XVIII.A.2]: Provide the following:

• An assessment as to whether the quality of stormwater discharges as measured at designated outfalls is improving, staying the same or declining;
• An assessment as to whether wet-weather receiving water quality within the jurisdiction of the Permittee is improving, staying the same or declining, when normalized for variations in rainfall patterns.

The LARWQCB EO approved the City of Gardena Request to Modify the Board Directive to Commence Baseline Monitoring Pursuant to the Monitoring and Reporting Program as Set Forth in Attachment E (Los Angeles County Municipal Separate Storm Sewer System (MS4) Permit – NPDES Permit No. CAS 004001; Order No. R4-2012-075) on March 6, 2019, and the first water quality sample was collected on November 22, 2018. Stormwater outfall and receiving water quality data, collected during the past three years, do not yet allow for the development of an informative BMP/WCM effectiveness assessment.

6.7 Integrated Monitoring Compliance Report, Stormwater Control Measures [Attachment E – XVIII.A.5.d]: Provide a description of efforts that were taken to address stormwater discharges that exceeded one or more applicable water quality based effluent limitation, or caused or contributed to aquatic toxicity:

Through the voluntary early installation of Connector Pipe Screen (CPS) Full Capture Devices (FCDs) trash, organic matter, and sediment conveyance during storm events should be greatly reduced, however, absent maintenance and trash removal records, a determinations of trash volumes captured cannot be made.

The average copper content of automotive brake pads is rapidly declining as numerically assessed in a California Storm Water Quality Association (CASQA) technical report on the subject.

Water quality monitoring data collected prior to October 1, 2018 appears to include transcription errors and should be considered suspect until such time as the original analytical reports are made available.

6.8 Additional Information (optional): If available, the Permittee may include / attach the following items to their report:

• Hydrographs and Flow Data: Hydrographs or flow data of pre- and post-control activity for the 85th percentile, 24- hour rain event, if control measures were designed to reduce impervious cover or stormwater peak flow and flow duration.
• Reference Watershed Flow Duration Curves: For natural drainage systems, develop a reference watershed flow duration curve and compare it to a flow duration curve for the subwatershed under current conditions. • GIS Project Files: If available, submit a GIS project file that maps all implementation of on-the-ground projects (e.g. riparian buffer/wetland restoration; distributed/green streets; regional projects; new development and redevelopment on-site; and new development and redevelopment off-site)

The City of Gardena does not yet consider the integrity and reliability of this data to be sufficient for regulatory reporting and review. We are continuing to assess how the information can be better collected, validated, assessed, and presented.

City of Gardena Individual Form
Reporting Year 2020-21

7 Non-Stormwater Control Measures Summary
Complete the following items in this section.

7.1 Provide a description of efforts that were taken to mitigate and/or eliminate all non-stormwater discharges that exceeded one or more applicable water quality based effluent limitations, non-stormwater action levels, or caused or contributed to Aquatic Toxicity [Attachment E – XVIII.A.5.c]:

The inventory/screening program implemented by the City of Gardena during April-June 2019 suggested that significant Dominguez Channel Non-Stormwater were the result of conditionally exempt MS4 NPDES Permitted discharges, originating outside of City drainage areas. No NSWD water quality monitoring data were developed during the reporting period, as no discharges met standard MS4 Permit criteria for prioritization.

7.2 Provide the status of multi-year efforts, including TMDL implementation, related to the implementation or effectiveness assessment of non-stormwater control measures, that were not completed in the current year and will continue into the subsequent year(s) [Attachment E – XVIII.A.3.h]:

On February 7, 2019, the City of Gardena City Council authorized an additional 500 MS4 Permit I/C facility inspections that resulted in a significant business and public outreach education effort to further reduce the potential for NSWDs, Illicit discharges, illicit connections, and the discharge of industrial runoff, that may currently be occurring.

7.3 Provide an assessment of the effectiveness of the Permittee control measures in effectively prohibiting non-stormwater discharges through the MS4 to the receiving water [Attachment E – XVIII.A.4.b]:

NSWD significant flows within the City of Gardena appeared to be primarily associated with conditionally exempt MS4 NPDES Permitted discharges. As discussed in Section 4.4, a single MS4 outfall, with a catchment outside of the City, was investigated for NSWD sources by the City and referred to Los Angeles County.

7.4 Provide an assessment as to whether the quality of non-stormwater discharges as measured at monitored outfalls is improving, staying the same or declining:

The City of Gardena undertook three NSWD surveys during the 2018-19 RY, where NSWD flows were generally insignificant and below generally recognized MS4 Permit prioritization criteria. There is insufficient data to support an assessment of whether NSWD water quality is improving, unchanged, or declining.

7.5 Provide an assessment as to whether receiving water quality within the jurisdiction of the Permittee is impaired, improving, staying the same or declining during dry-weather conditions. Each Permittee may compare water quality data from the reporting year to previous years with similar dry-weather flows, conduct trends analysis, draw from regional bioassessment studies, or use other means to develop and support its conclusions [Attachment E, Part XVIII.A.4.a]:

The LARWQCB EO approved of the City of Gardena Request to Modify Directive to Commence Baseline Monitoring Pursuant to the Monitoring and Reporting Program as Set Forth in Attachment E (Los Angeles County Municipal Separate Storm Sewer System (MS4) Permit – NPDES Permit No. CAS 004001; Order No. R4- 2012-075) on March 6, 2019, and while the City of Gardena implemented its third year of dry-weather water quality monitoring, data does not yet support development of this assessment.

7.6 Describe sources of significant non-stormwater discharges determined to be a NPDES permitted discharge, a discharge subject to A Record of Decision approved by USEPA pursuant to section 121 of CERCLA, a conditional exempt essential non-stormwater discharge, or entirely comprised of natural flows. [Attachment E – IX.F.2]

NSWD significant flows within the City of Gardena appeared to result from conditionally exempt MS4 NPDES Permitted discharges. A single prioritized MS4 outfall was identified as having a drainage area exclusive of the City. No NSWD water quality monitoring data were developed during the reporting period.

City of Gardena Individual Form
Reporting Year 2020-21

8 TMDL Reporting
Complete the following items in this section.

8.1 Trash TMDL Compliance Report [VI.E.5.c.i]

For Permittees subject to Trash TMDLs, attach a Trash TMDL compliance report for each applicable Trash TMDL detailing compliance with applicable interim and/or final effluent limitations. Indicate if compliance is being achieved through (1) full capture systems; (2) partial capture devices and/or institutional controls; (3) combined compliance approaches; (4) minimum frequency of assessment and collection (MFAC); or (5) an alternative compliance option.

Although not subject to a trash TMDL, the City of Gardena has installed Connector Pipe Screen (CPS) Full Capture Device (FCD) and 87% effective Automatic Retracting Screen (ARS) devices in at least 184, of 230, City owned catch basins in partial and early implementation of the SWRCB Trash Policy. This was documented in the City of Gardena Statewide Trash Provisions Implementation Assessment Plan submitted to the LARWQCB on February 15, 2019. An additional 400 similar installations have been budgeted for the FY 2021-2022 period, using SCWP MPTA support. During the reporting period, the Los Angeles County Department of Public Works reported removing just over 4 tons of debris from 220 catch basins in the City.

8.2 TMDL Reporting [Attachment E, XIX]

Report on progress towards achieving interim or final milestones/WQBELs/RWLs based on applicable compliance schedules in Attachments L-R and any additional milestones and corresponding deadlines in an approved WMP/EWMP. If this information is reported in another document (e.g. Annual Report Watershed Form) or an attachment, clearly state and provide a reference to the pertinent document and section.

The only active TMDL currently applicable to the City of Gardena, as identified in Table K-4 of the amended Permit, is the Dominguez Channel and Greater Los Angeles and Long Beach Harbors Toxic Pollutants TMDL.

As summarized in Part E, of Attachment N, to the Permit, this is probably the most complex TMDL developed by the LARWQCB, targeting potential toxicity resulting from six metals, DDTs, PCBs, and PAHs, with widely varying interim and final pollutant concentrations, within more than a dozen water bodies, for water column, sediment, and fish tissue matrices. Fortunately, most Gardena storm drains are concrete-lined and in the Freshwater portion of the Dominguez Channel, where receiving water quality can be effectively assessed immediately east of Vermont Avenue. Small portions of Gardena contribute runoff, to the much larger tributary area and discharge flows from the City and County of Los Angeles, through a vegetated channel under Artesia Boulevard, also located just east of Vermont Avenue, into the Dominguez Channel Estuary.

Flows from Gardena would not typically be expected to significantly impact storm or non-storm water discharge water quality from this drain; however, this supposition could be revisited following a referral from the City of Los Angeles based on water quality monitoring data from the outfall location.

In response to the LARWQCB baseline monitoring letters of January 6, 2017 and September 9, 2018, the City of Gardena executed a November 28, 2018 Memorandum of Agreement (MOA), with the South Bay Cities Council of Governments (SBCCOG), to financially contribute to the existing Dominguez Channel Watershed Management Area (DCWMA) Dominguez Channel and Greater Los Angeles and Long Beach Harbors Toxic Pollutants TMDL Monitoring Study. Following payment, the MOA became effective on December 18, 2018, as was noted in the LARWQCB letter of March 3, 2019. This MOA resulted in the DC WMA sharing with Gardena sediment chemistry, grain size, toxicity and benthic infauna data for station B18-10397, located just above the Torrance Lateral, along with fish tissue bioaccumulation chemistry data from the same general location. The sediment and fish tissue data were included as part of the 2018 Bight Program Assessment Reports, which can be downloaded from https://www.sccwrp.org/about/research-areas/regional-monitoring/southern-

california-bight-regional-monitoring-program/bight-program-documents/bight-18/.

The City of Gardena anticipates that true pollutant source controls, such as the changing formulation of automotive friction pads, diesel exhaust filters and afterburners, and increased pesticide regulation, will continue to result in progress towards achieving water quality objectives and supporting receiving water beneficial use objectives. The City contributes to these efforts by having implemented an aggressive street vacuuming program and an effective MS4 Permit I/C facility inspection and enforcement program.

City of Gardena Individual Form
Reporting Year 2020-21

9 Watershed Hydrology
Complete the following items in this section.

If the information on watershed hydrology requested in the following section is included in a Watershed Form or was previously included in a WMP or EWMP, you may simply reference those documents.

9.1 (If applicable) Watershed Summary Information, Organization, and Content: Provide the information below in the odd year Annual Report (e.g., Year 1, 3, 5) 22, or any updates to the information below if previously provided. The requested information shall be provided for each watershed within the Permittee’s jurisdiction [Attachment E – XVII]:

Provide the following information related to the Watershed Management Area:
1) Description of effective TMDLs, applicable WQBELs, receiving water limitations, implementation and reporting requirements, and compliance dates;
2) List of CWA Section 303(d) listings not addressed by TMDLs. 3) Results of regional bioassessment monitoring. (If applicable, a reference to the SMC will suffice here.) 4) Description of known hydromodification effects to receiving waters. 5) Description and location of natural drainage systems. 6) Description of groundwater recharge areas, including number and acres. 7) Maps and/or aerial photographs identifying ESAs, ASBS, natural drainage systems, and groundwater recharge areas.

1. Effective TMDLs, WQBELs, RWLs, implementation and reporting requirements, and compliance dates are identified in the amended 2012 Coastal Los Angeles County MS4 Permit and are further described in the appropriate section of the LARWQCB website. The City of Gardena is continuing to implement new BMPs, WCMs, and source controls to support the attainment of receiving water beneficial use objectives.

2. The State Water Resources Control Board (SWRCB) Draft 2018 California Integrated Report website (https://www.water boards.ca.gov/water_issues/programs/water_quality_assessment/2018_integrated_report.ht ml) recommends development of a TMDL for indicator bacteria in the (lined) Dominguez Channel.

3. Results of a 2015 bioassessment study conducted by the Southern California Coastal Water Research Project (SCCWRP) concluded that metals, pyrethroids, and toxicity were either rarely above threshold or weakly associated with biological condition (See Bioassessment of Streams in Southern California: A Report on the First Five Years of the Stormwater Monitoring Coalition’s Regional Stream Survey, SCCRWP, Technical Report 844). The study validates results from SWAMP-generated ambient and wet weather data for Dominguez Channel that metals and toxics are not significant contributors to the channel’s impairment.

4. The Dominguez Channel within the City of Gardena is a hardened flood control conveyance.

5. The City of Gardena Willows Wetland occupies approximately 13.6 acres of land in southeastern Gardena, northwest of the State Route 91 and Interstate 110 interchange corridor. This site is identified as a natural drainage area that might be modified to increase infiltration and provide additional runoff water treatment.

6. In April 2021, the Friends of the Gardena Willows Wetland Preserve submitted a Wildlife Conservation Board Riparian Habitat Conservation Planning Grant Application in amount of $325,000 for Wetland Restoration.

7. The Dominguez Channel Watershed is highly urbanized with few, if any, large groundwater recharge areas.

8. There are no ESAs, ASBSs, or surficial groundwater recharge areas remaining within the City of Gardena.

There is a short unlined drainage conveyance, serving mostly Los Angeles City and County jurisdictional areas, located to the east of Vermont Avenue, adjacent to Artesia Boulevard. An aerial photograph identifying the Gardena Willows Wetlands Preserve is attached below as Figure-1.

22 Year 1 = 2012-13 Annual Report; Year 2 = 13-14; Year 3 = 14-15; Year 4 = 15-16; Year 5 = 16-17;… City of Gardena Individual Form
Reporting Year 2020-21

1) With the exception of a quarter square-mile area, in northwest Gardena, that drains to WBD No. or HUC-12 Subwatershed 180701060101 (Upper Dominguez Channel), the remainder of the City drains to WBD No. or HUC-12 Subwatershed 180701060102 (Lower Dominguez Channel). While the basin plan recognizes no named tributaries to the Dominguez Channel, the Torrance Lateral is a commonly recognized conveyance within the Dominguez Estuary and below all City of Gardena catchments.

Provide the following information related to the Subwatershed (HUC-12):
1) Description including HUC-12 number, name and a list of all tributaries named in the Basin Plan. 2) Land Use map of the HUC-12 subwatershed.
3) 85th percentile, 24-hour rainfall isohyetal map for the subwatershed. 4) One-year, one-hour storm intensity isohyetal map for the subwatershed. 5) MS4 map for the subwatershed, including major MS4 outfalls and all low flow diversions.

Figure-1 City of Gardena Willows Wetlands Preserve Location Aerial Photograph

City of Gardena Individual Form
Reporting Year 2020-21

Figure-2 Dominguez Channel Watershed Land Use Map (HUC-12 180701060102)

City of Gardena Individual Form
Reporting Year 2020-21

Figure-3 City of Gardena Vicinity, 85th Percentile, 24-hour Isohyetal Map (0.90” to 0.98”, mean 0.94”).

City of Gardena Individual Form
Reporting Year 2020-21

Figure-4 City of Gardena Vicinity One-year, One-hour, Isohyetal Map (0.28” to 0.32”)

City of Gardena Individual Form
Reporting Year 2020-21

Figure-5 City of Gardena Vicinity Map showing major MS4 Elements and Outfall Locations

City of Gardena Individual Form
Reporting Year 2020-21

2) The estimated baseline Effective Impervious Area (EIA) in the City of Gardena is approximately 0.74 or 74%.

Figure-6 City of Gardena Jurisdiction Area Showing MS4 Elements and Major Outfalls

Provide the following information related to the Permittee(s) Drainage Area(s) within the Subwatershed:
1) A subwatershed map depicting the Permittee(s) jurisdictional area and the MS4, including major outfalls (with identification numbers), and low flow diversions (with identifying names or numbers) located, within the Permittee’s jurisdiction.
2) Provide the estimated baseline percent of effective impervious area (EIA) within the Permittee(s) jurisdictional area as existed at the time that this Order became effective and, if possible, the estimated change in the stormwater runoff volume during the 85
th percentile, 24-hour storm event.

City of Gardena Individual Form
Reporting Year 2020-21

(1) There were a total of 12 storm events during the 2020-21 reporting period. (2) The highest volume event began on December 28, 2020 and concluded on December 29, 2020. (3) The highest number of consecutive days with measurable rainfall was two, from December 28 and 29, 2020. (4) The total rainfall measured during the 2020-21 reporting period was 4.72 inches, compared to the 13.18- inch annual rainfall average for the Coastal Plain, as stated in the LACDPW 2016-17 Hydrologic Report. The total rainfall depth was significantly lower than the average, and therefore, there were significantly less qualifying storm events throughout the fiscal year. The lower-than-average rainfall also made mobilization more challenging than “normal”. Mobilization changes were implemented throughout the wet season to increase social distancing and reduce the potential risk of CoViD 19 transmission. These changes included driving separately, wearing masks, increased sanitation, and increased separation while on site.

9.2 Rainfall Summary: Provide a rainfall summary for the reporting year including: (1) A summary of the number of storm events; (2) The highest volume event (inches/24 hours); (3) The highest number of consecutive days with measureable rainfall; and (4) The total rainfall during the reporting year compared to average annual rainfall for the subwatershed [Attachment E – XVIII.A.2]:

9.3 SW Monitoring Event Summary: Provide a summary table describing rainfall during stormwater outfall and wet -weather receiving water monitoring events. The summary description shall include the date, time that the storm commenced and the storm duration in hours, the highest 15- minute recorded storm intensity (converted to inches/hour), the total storm volume (inches), and the time between the storm event sampled and the end of the previous storm event.

Table 10a: Summary of Stormwater Outfall and Wet Weather Receiving Water Monitoring Events

Event

Date

Storm Start
Time

Storm
Duration
[hours]

Highest
Storm
Intensity 15
min
[in/hr]

Total
Storm
Volume
[inches]
Span
Between
Sample
Event and
Previous
Storm Event
[hours]
Event 1 11/07/2020 07:13 1.66 0.02 0.03 120
Event 2 12/28/2020 00:12 25.7 0.56 1.68 834
Event 3 01/28/2021 19:26 17.0 1.00 1.16 88
City of Gardena Individual Form
Reporting Year 2020-21

Information and task characterizations provided in this report constitute a best effort to comply with permit requirements that may, or may not, subsequently be determined to constitute unfunded state mandates, based on future State Unfunded Mandate Commission findings. Based on these still evolving commission findings, the City of Gardena reserves the right to terminate the implementation of impacted permit provisions and seek subvention support which, if not provided, would lead to a contest of MS4 Permit enforcement. In the effort to promote shared water quality protection objectives, the City continues to implement this costly MS4 Permit to the maximum extent practicable using primarily diverted City General Funds.

On October 11, 2021, CWE was notified that, due to changing Environmental Laboratory Accreditation Program (ELAP) certification requirements, Eurofins Calscience would no longer perform Alkyl PAH analyses, only 8270C SIM PAH analyses. This was discussed with Board staff, along with the observation the alkyl PAHs were not identified in 2021, nor included in the LARWQCB 2021, MS4 Permits. This will be further addressed in the Monitoring Plan Revision due to the Board in 2023.

The critical dry weather event, for the 2020-2021 reporting year, occurred on July 29, 2020, in coordination with County Mass Emission Station (MES) and Dominguez Channel EWMP Group CIMP monitoring. Mobilization for the critical first wet weather event occurred on November 7, 2020, as it was forecast as qualifying at 0600 hours on November 7, 2020, with an 85% chance of depths greater than 0.25’’. Because the forecast was qualifying, and because it was the critical first flush event of the season, samples were collected on November 7, 2020, although only 0.03’’ of rain was produced during the event. Second and third wet-weather water and sediment quality monitoring events were successfully completed on December 28, 2020 and January 28, 2021.

The winter dry-weather event occurred on March 23, 2021, in coordination with Los Angeles County MES and Dominguez Channel EWMP Group Coordinated Integrated Monitoring Program (CIP) Plan monitoring. 10 Additional Information (Optional)
Provide any additional information in this section.

You may use this section to report any additional information not specified in the Individual Permittee Report Form; information in the Individual Form that is better presented outside of the report form structure; and/or data limitations that prevented requested information from being obtained. You may also provide an additional detailed summary table describing control measures that are not otherwise described in the reporting requirements.

10.1 Data Limitations: If any of the requested information cannot be obtained, provide a discussion of the factor(s) limiting its acquisition and steps that will be taken to improve future data collection efforts.

The accurate calculation of watershed EIAs is based on subjective criteria that are difficult to quantify and subject to private property modifications generally considered overly intrusive for municipal oversight and regulation. Retention of storm water runoff volumes within BMPs and WCMs is dependent on impervious area, rainfall intensity, and rainfall depth that vary significantly by storm and location within the watershed. Runoff volumes captured should be estimated using assumed rainfall depth and impervious catchment area values incorporated in the annual report, rather using assumptions that ignore actual annual rainfall depths.

10.2 (optional) GIS Files: If available, the Permittee(s) may submit GIS project files that map all implementation of on-the- ground projects (e.g. riparian buffer/wetland restoration; distributed/green streets; regional projects; new development and redevelopment on-site; and new development and redevelopment off-site).

This information has not yet integrated into a unified database format for the City of Gardena.

10.3 Summary of Events Conducted During Reporting Year: Summarize the required monitoring for the year and the monitoring events conducted during the year. Also include the following summary table describing rainfall during stormwater outfall and wet-weather receiving water monitoring events: Additionally, discuss any problems with samples not being collected and their resolution.

City of Gardena Individual Form
Reporting Year 2020-21

Consistent with prior reporting years, rainfall data was downloaded for the Hollypark Drain #21 gauge, located within the City of Gardena, using the expanded ALERT system Website https://ladpw.org/wrd/precip/.

The City of Gardena is currently implementing a baseline water quality monitoring program as directed by the LARWQCB Executive Officer in its March 6, 2019, letter to the then City of Gardena City Manager. Therefore, no regional or CIMP related special studies were initiated.

Quality assurance/quality control (QA/QC) measures were coordinated with Eurofins Calscience, for wet- chemistry analyses, and Enthalpy Analytical, for microbiological analyses. All samples were analyzed within their required holding times, requiring coordination with analytical laboratories. We understand that a different sub-laboratory will be used for mercury analyses going forward.

City of Gardena water and sediment quality monitoring data, in a CEDEN style Excel® workbook, will be separately submitted to the LARWQCB by December 15, 2021.

In October 2021, CWE and the City of Gardena were advised that, due to SWRCB Environmental Laboratory Accreditation Program (ELAP) changes, Eurofins Calscience Laboratories, would no longer perform Method 8270 SIM Alkyl Polynuclear Aromatic Hydrocarbon (PAH) analyses. This analysis was undertaken in response to the March 6, 2019, Monitoring Plan Modification Approval Letter from the Board Executive Officer to the Gardena City Manager. Page 3, Table 2, of that letter, required monitoring for Total PAHs as identified in footnote 22, but the table duplicated three PAHs (Benzo(a)Anthracene, Phenanthrene, and Pyrene) identified in footnote 22, a deuterated PAH surrogate, that should not be in field samples, and alkyl (C1-C4) Chrysene (sic), suggesting that these insertions were made in haste. Since the laboratory no longer analyzes for alkyl Chrysenes and Table E-6 of the recently adopted 2021 MS4 Permit does not include them, the City of Gardena draft revised monitoring and reporting program, due to the Board in December 2022, will be amended or adaptive to more accurate reflect the analyte list identified in Table E-6 of the 2021 MS4 Permit.

10.4 Identification of Non-Direct Measurements Utilized: Identify the measurements utilized within the report that were not directly taken as part of the CIMP (e.g., wet weather flow data, precipitation data, etc.). Additionally, discuss any problems with obtaining non-direct measurements and their resolution.

10.5 Regional and Special Studies: Summarize any regional and/or special studies conducted as part of meeting the CIMP requirements. Include and/or attach to this report any data not previously submitted to the Regional Water Board.

10.6 Quality Assurance/Quality Control: Summarize Quality Assurance/Quality Control (QA/QC) results and actions to address any QA/QC issues that arose during the year. Potential issues include:

• Holding Time
• Contamination
• Precision
• Summary of Qualified Data (if necessary)

10.7 Assessment of Monitoring Data: Include and/or attach to this report any receiving water and stormwater outfall data not previously submitted to the Regional Water Board.

All monitoring data and associated metadata must be summarized in an Excel spreadsheet and sorted by watershed, subwatershed, monitoring station/outfall identifier linked to a watershed map, and monitoring condition (wet weather receiving water, dry weather receiving water, stormwater outfall, and non-stormwater outfall). The data summary must include the date, sample type, (flow-weighted composite, grab, field measurement), sample start and stop times, parameters, analytical method, value, and units.

City of Gardena Individual Form
Reporting Year 2020-21

For the City of Gardena, wet-weather receiving water and sediment samples were first collected in 2018 and three seasons of data collection provides insufficient data from which to develop trend assessments for water or sediment quality. Samples collected for aquatic toxicity during the first dry weather event and first two wet weather events passed both survival and reproduction bioassays.

The City of Gardena initiated stormwater outfall monitoring in 2018 and three seasons of data collection provides an insufficient foundation for the assessment of changes in the quality of stormwater outfall discharges. No aquatic toxicity analyses were required stormwater outfalls, nor were any collected.

10.8 Assessment of Receiving Water Monitoring Data: Provide an assessment as to whether wet-weather receiving water quality within the watershed is improving, staying the same, or declining, when normalized for variations in rainfall patterns. The assessment may compare water quality data from the reporting year to previous years with similar rainfall patterns, trends analysis, draw from regional bioassessment studies, or use other means to develop and support conclusions. Also provide an assessment as to whether receiving water quality within the watershed management group is impaired, improving, staying the same, or declining during dry-weather conditions.

Data from all receiving water sites would be assessed in this section. Water quality improvements or degradation would be identified. If aquatic toxicity was confirmed and a TIE was conducted, the toxic chemicals as determined by the TIE, will be identified. All relevant data will be included in an appendix to allow the Regional Water Board to review the adequacy and findings of the TIE, including, but not be limited to, the sample(s) date, sample(s) start and end time, sample type(s) (flow-weighted composite, grab, or field measurement), sample location(s) as depicted on the map, the parameters, the analytical results, and the applicable limitation.

For WMPs/EWMPs, this assessment should focus on Category 1, 2, and 3 Water Body-Pollutant Combinations.

10.9 Assessment of Stormwater Outfall-based Monitoring Data: Provide an assessment as to whether the quality of stormwater discharges as measured at designated outfalls is improving, staying the same, or declining. The assessment may compare water quality data from the reporting year to previous years with similar rainfall patterns, conduct trends analysis, or use other means to develop and support its conclusions (e.g., use of municipal action levels as provided in Attachment G of the Permit).

Data from all stormwater outfalls sites shall be assessed in this section. If aquatic toxicity was confirmed and a TIE was conducted, the toxic chemicals as determined by the TIE, will be identified. All relevant data will be included in an appendix to allow the Regional Water Board to review the adequacy and findings of the TIE, including, but not be limited to, the sample(s) date, sample(s) start and end time, sample type(s) (flow-weighted composite, grab, or field measurement), sample location(s) as depicted on the map, the parameters, the analytical results, and the applicable limitation.

For WMPs/EWMPs, this assessment should focus on Category 1, 2, and 3 Water Body-Pollutant Combinations.

City of Gardena Individual Form
Reporting Year 2020-21

The initial outfall inventory was conducted on April 26, May 1, and May 3, 2019, during which, no significant discharges from the City of Gardena were observed, nor samples collected. Non-stormwater outfall screening occurred on June 7, 10, and 25, 2019, during which no significant discharges were observed, nor samples collected.

As commonly observed by most Los Angeles County MS4 Permittees, the Fecal Indicator Bacteria (FIB), Escherichia coli (E. coli), is the most common Dominguez Channel receiving water limitations exceedance.

During wet-weather, the two stormwater outfalls monitored by the City of Gardena contributed to this exceedance, although they are unlikely to be sole, or even primary, discharge source to the Dominguez Channel.

10.10 Non-stormwater Outfall Screening and Monitoring Program Implementation and Assessment of Monitoring Data: Summarize the implementation of the non-stormwater outfall screening and monitoring program and assess monitoring data collected as part of the program. The summary of program implementation shall include:
• The number and percentage of source identifications completed and their outcome. • The number of outfalls where significant non-stormwater discharge was attributed to other NPDES permitted discharges; other authorized non-stormwater discharges; or conditionally exempt discharges pursuant to Part III.A of the Permit.
• An assessment of the effectiveness of the Permittee(s) control measures in effectively prohibiting non- stormwater discharges through the MS4 to the receiving water. • The status of multi-year efforts related to the non-stormwater outfall screening and monitoring program that were not completed within the current year and will continue. Further details may be included in individual forms submitted by Permittees.

Data from all non-stormwater outfalls sites shall be assessed in this section. If aquatic toxicity was confirmed and a TIE was conducted, the toxic chemicals as determined by the TIE, will be identified. All relevant data will be included to allow the Regional Board to review the adequacy and findings of the TIE, including, but not be limited to, the sample(s) date, sample(s) start and end time, sample type(s) (flow-weighted composite, grab, or field measurement), sample location(s) as depicted on the map, the parameters, the analytical results, and the applicable limitation.

10.11 Identification of Exceedances: Summarize all identified exceedances of (1) outfall-based stormwater monitoring data, (2) wet weather receiving water monitoring data, (3) dry weather receiving water data, and (4) non-stormwater outfall monitoring data against all applicable receiving water limitations, water quality-based effluent limitations, non- stormwater action levels, and aquatic toxicity thresholds (as defined in Sections XII.F and G of the MRP).

Cause or Contribute
Where Receiving Water Limitations were exceeded, a description of efforts that were taken to determine whether discharges from the MS4 caused or contributed to the exceedances shall be provided. The Group shall summarize all receiving water exceedances (as shown in Example Table 3); the Group shall also summarize monitoring results for all outfalls upstream of the receiving water monitoring site with an exceedance (Example Table 4). Any of the conditionally exempt non-stormwater discharges identified in Section 4.3 that are a source of pollutants that causes or contributes to an exceedance of applicable receiving water limitations and/or water quality-based effluent limitations shall be identified in this section.

Outfall Data
Additionally, outfall-based stormwater monitoring data will be compared to municipal action levels (MALs), and those sub watersheds with a running average of twenty percent or greater of exceedances of the MALs listed in Attachment G of the Permit in discharges of stormwater from the MS4 will be identified. All sample results that exceeded one or more applicable thresholds shall be identified (e.g. all outfalls exceeding receiving water limitations shall be summarized whether or not there is a downstream receiving water exceedance, as shown in Example Table 5).

City of Gardena Individual Form
Reporting Year 2020-21

Table 1 Receiving Water: Limitations or Total Maximum Daily Load (TMDL) Exceedances

Date
Monitoring
Event (if
available)

Condition
Receiving
Water
Location

Parameter

Result

Units
Upstream
Outfalls
Monitored
7/29/2020 2020-21 DWE1 Dry Gardena-R1 E. coli1 15,000 MPN/100mL None 11/07/2020 2020-21 WWE1 Wet Gardena-R1 E. coli1 28,000 MPN/100mL FS3, FS4 12/28/2020 2020-21 WWE2 Wet Gardena-R1 E. coli1 15,000 MPN/100mL FS3, FS4 1/28/2021 2020-21 WWE3 Wet Gardena-R1 E. coli1 5,200 MPN/100mL FS3, FS4 1 City of Gardena MAL Action Plan is summarized in Section 10.13.

Table 2 Monitoring Results for Monitored Outfalls Upstream of a Receiving Water Exceedance

Date
Monitoring
Event (if
available)

Condition Gardena
Outfall

Parameter

Result

Units WQBEL/RWL
Exceedance?
11/07/2020 2020-21 WWE1 Wet FS3 E. coli1 90,000 MPN/100mL Yes 11/07/2020 2020-21 WWE1 Wet FS4 E. coli1 80,000 MPN/100mL Yes 12/28/2020 2020-21 WWE2 Wet FS3 E. coli1 9.800 MPN/100mL Yes 12/28/2020 2020-21 WWE2 Wet FS4 E. coli1 15,000 MPN/100mL Yes 1/28/2021 2020-21 WWE3 Wet FS3 E. coli1 2,000 MPN/100mL Yes 1/28/2021 2020-21 WWE3 Wet FS4 E. coli1 2,400 MPN/100mL Yes 1 City of Gardena MAL Action Plan is summarized in Section 10.13.

Table 3 Summary of All Outfalls with Result(s) Above Applicable WQBEL/RWL

Date
Monitoring
Event (if
available)

Condition LARUR2
Outfall

Parameter

Result

Units Receiving
Water
11/07/2020 2020-21 WWE1 Wet FS3 E. coli1 90,000 MPN/100mL Yes 11/07/2020 2020-21 WWE1 Wet FS4 E. coli1 80,000 MPN/100mL Yes 12/28/2020 2020-21 WWE2 Wet FS3 E. coli1 9,800 MPN/100mL Yes 12/28/2020 2020-21 WWE2 Wet FS4 E. coli1 15,000 MPN/100mL Yes 1/28/2021 2020-21 WWE3 Wet FS3 E. coli1 2,000 MPN/100mL Yes 1/28/2021 2020-21 WWE3 Wet FS4 E. coli1 2,400 MPN/100mL Yes 1 City of Gardena MAL Action Plan is summarized in Section 10.13..

City of Gardena Individual Form
Reporting Year 2020-21

Monitoring data for copper, lead, and zinc were evaluated against the Dominguez Channel and Greater Los Angeles and Long Beach Harbor Waters Toxic Pollutants TMDLs interim WQBELs for discharges to the freshwater Dominguez Channel during wet-weather. No exceedances were observed among the reported data.

On November 12, 2020, the Office of Environmental Health Hazard Assessment (OEHHA) released Health Advisory And Guidelines for Eating Fish from Alondra Park Lake (Los Angeles County)23 due to PCB and Mercury contamination. This report and Fact Sheets may be found on the following pages. Based on the non- stormwater, rising groundwater derived discharge, through the undocumented connection between the Lake and Dominguez Channel, discovered on April 15, 2020, we suspect the lake may be a potential contributing source of many of the legacy pollutants identified within the Los Angeles Harbor Toxics TMDL and any receiving water monitoring required of the City of Gardena.

Along with most MS4 Permittees, the only commonly observed exceedance found by the City of Gardena Monitoring program continues to be the fecal indicator bacteria E. coli. This pollutant is unique in replicating and forming biofilms along drainage conveyance facility walls, in sediments, and in and of itself is normally harmless or even beneficial, however it can be indicative of the potential for fecal contamination from many organisms. In response to this Municipal Action Level (MAL) or Receiving Water Limitations (RWL) exceedance, the City of Gardena continues to more fully implement the MS4 Permit I/C inspection program and assess the need for better trash and grease controls within the City. Our initial efforts have identified a significant food service establishment educational need, that will be carried forward into the next permit cycle.

10.12 TMDL Provisions and WMP/EWMP Milestones: Report on progress towards achieving interim or final milestones, water quality-based effluent limitations, and receiving water limitations based on applicable compliance schedules in Attachments L-R of the LA County MS4 Permit and any additional milestones and corresponding deadlines in an approved WMP/EWMP.

TMDL reporting items required per the applicable schedules outlined in Attachment E, Section XIX.A through XIX.G of the Permit may be provided here or as an attachment to this report.

10.13 Efforts to Address Exceedances: The previous sections summarized all activities completed during the Reporting Year. This section shall be used to link the aforementioned activities to specific exceedances identified within the Reporting Year. The section may reference activities discussed within Section 7 and would also include the following:

• A description of efforts that were taken to address stormwater discharges that exceeded one or more applicable water quality based effluent limitations, or caused or contributed to Aquatic Toxicity. • Where Receiving Water Limitations were exceeded, a description of all efforts that were taken to control the discharge of pollutants from the MS4 to those receiving waters in response to the exceedances. • For sub watersheds not part of a WMP or EWMP, and/or not subject to any TMDLs, where a running average of twenty percent or greater of exceedances of the MALs in any discharge of stormwater from the MS4 is present, a MAL Action Plan must be submitted with the Annual Report. Where applicable, the Action Plan should be included here.

23 https://oehha.ca.gov/advisories/alondra-park-lake
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The City of Gardena is exclusive of the Dominguez Channel Watershed Management Area Group CIMP.

Wet-weather aquatic toxicity samples collected on November 7, 2020 and December 28, 2020, and a dry- weather sample collected on July 29, 2020, passed both survival and reproduction bioassays.

10.14 CIMP Adaptive Management: This section shall be utilized to describe adaptive management of the CIMP and include:

• Identification of changes to any aspect of the CIMP (including changes to the non-stormwater outfall-based screening and monitoring program if changes are determined to be necessary during the one re-assessment required during the Permit term; indicate when the re-assessment was done or will be done); • Reason(s) for the change(s);
• Timeframe for implementing the changes; and
• Identification of those changes that require Regional Board Executive Officer approval

10.15 Information to Meet Additional Reporting Requirements Related to Monitoring: Results for monitoring of any pollutant more frequently than required by the Permit using approved test procedures, or another method specified in the Permit shall be reported here.

This section will also include:

a. A full laboratory report for each chronic toxicity test prepared according to the appropriate test methods manual chapter on Report Preparation, including:
i. The chronic toxicity test results for the t-test, reported as “Pass” or “Fail”, and the “Percent Effect”. ii. The dates of sample collection and initiation of each toxicity test. iii. Test species with biological endpoint values for each concentration tested. iv. Reference toxicant test results.
v. Water quality measurements for each toxicity test (e.g., pH, dissolved oxygen, temperature, conductivity, hardness, salinity, chlorine, ammonia).
vi. TRE/TIE testing results.
vii. A printout of CETIS (Comprehensive Environmental Toxicity Information System) program results. b. A map of all sample location(s), including separate TIE sample locations (if any).

As noted previously, all monitoring data and associated meta data used to prepare the Annual Report must be summarized in an Excel spreadsheet and sorted by watershed, subwatershed and monitoring station/outfall identifier linked to the subwatershed map. The data summary must include the date, sample type, (flow-weighted composite, grab, field measurement), sample start and stop times, parameters, analytical method, value, and units.

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The City of Gardena is currently exclusive of any WMP/EWMP groups and currently has no recommendations regarding the effectiveness of runoff and pollutant control measures. The City continues to implement its MS4 Permit I/C facility inspection program and made sixty-nine Industrial General Permit (IGP) non-filer referrals to the LARWQCB during the past year.

Assess the effect of control measures implemented within the watershed and include the following:
• Identification of the most effective control measures and a description of why the measures were effective. • Identification of the least effective control measures and a description of why the measures were deemed ineffective.

The City of Gardena is currently exclusive of any WMP/EWMP groups and no milestone or endpoint objectives or dates have been identified.

In years where milestones as defined in the WMP/EWMP are included within the permit year, compare data collected from the CIMP with water quality endpoints as projected in the reasonable assurance analysis. Comparison may be captured in a table similar to the one presented below.

The City of Gardena is currently exclusive of any WMP/EWMP groups and currently has no recommendations regarding the effectiveness of runoff and pollutant watershed control measures (WCMs).

Describe changes to control measures, including the following (where applicable):

• For those control measures identified as least effective, describe how the control measures will be modified or replaced.
• Identification of significant changes to control measures during the prior year and the rationale for the changes.
• Description of all significant changes to control measures anticipated to be made in the next year and the rationale for the changes. Those changes requiring approval of the Regional Board or its Executive Officer shall be clearly identified at the beginning of the Annual Report. • The status of all multi-year efforts that were not completed in the current year and will continue into the subsequent year(s).
• Description of additional BMPs, including modifications to current BMPs that will be implemented to prevent or reduce any pollutants that are causing or contributing to the exceedances of receiving water limitations. • An implementation schedule for additional BMPs, including modifications to current BMPs that will be implemented to prevent or reduce any pollutants that are causing or contributing to the exceedances of receiving water limitations.
• Any modifications, including where appropriate, new compliance deadlines and interim milestones, with the exception of those compliance deadlines established in a TMDL, necessary to improve the effectiveness of the WMP/EWMP.
11 Adaptive Management Strategies
Include the following information on Adaptive Management Strategies as required in Section XVIII.A.6 of the MRP.

11.1 Program Assessment
This section shall summarize the most effective and least effective control measures on a watershed scale as well as receiving water quality results in comparison to RAA projections.

11.2 Control Measure Effectiveness

11.3 Assessment of Milestones

11.4 Modifications and Changes to Control Measures

City of Gardena Individual Form
Reporting Year 2020-21

12 City of Gardena Confirmation of MS4 Permit Legal Enforcement Authority

City of Gardena Individual Form
Reporting Year 2020-21

ATTACHMENT C –
City of Gardena SCWP MPTA FY 2020‐2021 Annual Report

 



 


 









 


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