LOS ANGELES COUNTY

2008-09 STORMWATER

MONITORING REPORT

 

TABLE OF CONTENTS

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Acronyms and Abbreviations

Certification

American with Disabilities Act Information

Disclaimer

Executive Summary

Section 1    Introduction

1.1  Monitoring Program Objectives

1.2  Monitoring Program Status

1.2.1  Core Monitoring

1.2.1.1   Mass Emission Monitoring

1.2.1.2   Water Column Toxicity Monitoring

1.2.1.3   Tributary Monitoring

1.2.1.4   Shoreline Monitoring

1.2.1.5   Trash Monitoring

1.2.2  Regional Monitoring

1.2.2.1   Estuary Sampling

1.2.2.2   Bioassessment

1.2.3  Special Studies

1.2.3.1   New Development Impacts Study in the Santa Clara Watershed

1.2.3.2   Peak Discharge Impact Study

1.2.3.3   BMP Effectiveness Study

Section 2    Site Descriptions

2.1  Mass Emission Site Selection

2.2  Mass Emission Monitoring Locations and Drainage Areas

2.3  Tributary Site Selection

2.4  Tributary Monitoring Locations And Drainage Areas

Section 3    Methods

3.1  Precipitation and Flow Measurement

3.1.1  Precipitation Monitoring

3.1.2  Flow Monitoring

3.2  Stormwater Sampling

3.2.1  Wet Weather Sample Collection Methods

3.2.2  Dry Weather Sample Collection Methods

3.2.3  Field Quality Assurance/Quality Control Plan

3.3  Laboratory Analyses

3.3.1  Chemical and Biological Analysis

3.3.2  Toxicity Analysis

Section 4    Results, Analysis, and Recommendations

4.1  Hydrology: Precipitation and Flow

4.2  Storm Water Quality

4.2.1  Comparison to Water Quality Objectives

4.2.1.1   Mass Emission Stations

4.2.1.2   Tributary Stations

4.2.1.3   Summary of Measurements Not Attaining Water Quality Objectives

4.2.1.4   Detection Limit Analysis

4.2.2  Correlation Analysis

4.2.3  Watershed Load Analysis

4.2.4  Water Column Toxicity Analysis

4.2.5  Trash Monitoring Analysis

4.2.6  Identification of Possible Constituent Sources

4.2.6.1   Fecal coliform

4.2.6.2   Copper and Zinc

4.2.6.3   Cyanide

4.2.6.4   Mercury

4.2.6.5   Sulfate and Selenium

4.2.6.6   Chloride and TDS

4.2.6.7   pH

4.2.6.8   Ammonia

4.3  Recommendations

4.3.1  Monitoring Methods

4.3.2  Source Investigations

4.3.3  Information Development

Section 5    References

 

Tables

Table 1-1         Bioassessment Site Locations within the County of Los Angeles for Year 2008

Table 2-1a       Land Use Distribution of Monitored Catchments for the Monitoring Program (Mass Emission Sites)

Table 2-1b       Land Use Distribution of Monitored Catchments for the Monitoring Program (Tributary Sites)

Table 3-1         Analytical Methods 2008-2009

Table 4-1         Summary of Hydrologic Data for Mass Emissions Stations

Table 4-2a       2008-2009 County of Los Angeles Wet Weather Monitoring Analytical Data Inventory

Table 4-2b       2008-2009 County of Los Angeles Dry Weather Monitoring Analytical Data Inventory

Table 4-3         2008-2009 County of Los Angeles Wet and Dry Weather Monitoring Toxicity Data Inventory

Table 4-4         2008-2009 Summary of Water Quality Objectives Attainment for Mass Emission Stations

Table 4-5         2008-2009 Summary of Water Quality Objectives Attainment for Tributary Monitoring Stations

Table 4-6a       Summary of Toxicity Results - Dry Weather

Table 4-6b       Summary of Toxicity Results - Wet Weather

Table 4-7         2008-2009 Total Suspended Solids Results For Mass Emissions Stations

Table 4-8         2008-2009 Estimated Total Suspended and Total Dissolved Solids Loads for Mass Emission Stations

Table 4-9.1      Estimated Pollutant Loads for Ballona Creek

Table 4-9.2      Estimated Pollutant Loads for Malibu Creek

Table 4-9.3      Estimated Pollutant Loads for Los Angeles River

Table 4-9.4      Estimated Pollutant Loads for Coyote Creek

Table 4-9.5      Estimated Pollutant Loads for San Gabriel River

Table 4-9.6      Estimated Pollutant Loads for Dominguez Channel

Table 4-9.7      Estimated Pollutant Loads for Santa Clara River

Table 4-10       Correlation Analysis of All Constituents vs. Total Suspended Solids (TSS)
2006-2009

 

Figures

Figure 1-1        Bioassessment Monitoring Study Locations

Figure 2-1        Mass Emission Monitoring Stations

Figure 2-2        Ballona Creek (S01) at Sawtelle Blvd., Los Angeles

Figure 2-3        Malibu Creek Mass (S02) at Piuma Rd., Unincorporated Los Angeles County

Figure 2-4        Los Angeles River (S10) at Wardlow Rd., Long Beach

Figure 2-5        Coyote Creek (S13) at Spring St., Long Beach

Figure 2-6        San Gabriel River (S14) at San Gabriel Pkwy., Pico Rivera

Figure 2-7        Dominguez Channel (S28) at Artesia Blvd., Torrance

Figure 2-8        Santa Clara River (S29) at The Old Road, Santa Clara

Figure 2-9        Dominguez Channel Watershed Tributary Monitoring Stations and Drainage Areas

Figure 2-10      Project No. 1232 (TS19), Dominguez Channel Watershed

Figure 2-11      PD 669 (TS20), Dominguez Channel Watershed

Figure 2-12      Project Nos. 5246 & 74 (TS21), Dominguez Channel Watershed

Figure 2-13      PD 21–Hollypark Drain (TS22), Dominguez Channel Watershed

Figure 2-14      D.D.I. 8 (TS23), Dominguez Channel Watershed

Figure 2-15      Dominguez Channel at 116th St. (TS24), Dominguez Channel Watershed

Figure 4-1        Historic Los Angeles Monthly Wet Season Rainfall at Station #716, Ducommun Street, Los Angeles

Figure 4-2        Los Angeles Annual (Wet Season) Rainfall at Station #716, Ducommun Street, Los Angeles

Figure 4-3        Comparison of Water Quality Data with Applicable Water Quality Objectives

Figure 4-4.1     Load Trend Analysis for Ballona Creek

Figure 4-4.2     Load Trend Analysis for Malibu Creek

Figure 4-4.3     Load Trend Analysis for Los Angeles River

Figure 4-4.4     Load Trend Analysis for Coyote Creek

Figure 4-4.5     Load Trend Analysis for San Gabriel River

Figure 4-4.6     Load Trend Analysis for Dominguez Channel

Figure 4-4.7     Load Trend Analysis for Santa Clara River

Figure 4-5        Plots of Metals versus Total Suspended Solids for All Mass Emission Stations

Figure 4-6        Plot of Total Mercury vs. Total Suspended Sediment for All Mass Emission Stations, 2006–2009

Figure 4-7        Plot of Selenium vs. Arsenic for Malibu Creek, 2006-2009

Figure 4-8        Plot of Selenium vs. Sulfate for Malibu Creek, 2006-2009

Figure 4-9        Total Suspended Solids Concentrations at Mass Emission Stations

Figure 4-10.1   Total Suspended Solids Concentrations for Ballona Creek

Figure 4-10.2   Total Suspended Solids Concentrations for Malibu Creek

Figure 4-10.3   Total Suspended Solids Concentrations for Los Angeles River

Figure 4-10.4   Total Suspended Solids Concentrations for Coyote Creek

Figure 4-10.5   Total Suspended Solids Concentrations for San Gabriel River

Figure 4-10.6   Total Suspended Solids Concentrations for Dominguez Channel

Figure 4-10.7   Total Suspended Solids Concentrations for Santa Clara River

Figure 4-11      Mass Emission Total Suspended Solids Loads

Figure 4-12      Mass Emission Total Dissolved Solids Loads

 

Appendices

A          Hydrographs for Catchments Monitored During Storms

B          Monitoring Results for Mass Emission and Tributary Monitoring Sites

C          Visual Trash Photos at Mass Emission Sites after Storm Events

D          City of Los Angeles Shoreline Monitoring Report

E          City of Santa Monica (Santa Monica Urban Runoff Recycling Facility) Raw Data

F          Costs

G          Contacts

H          Bioassessment Monitoring Report 2008

I            Ballona Creek Watershed Trash Compliance Monitoring Report

J           Los Angeles River Watershed Trash Compliance Monitoring Report

K          Table of Monitoring Events