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Mark Pestrella
Assistant Deputy Director/
Division Engineer

Terri Grant
Assistant Division Engineer

Hector J. Bordas
Assistant Division Engineer

Rossana D’Antonio
Assistant Division Engineer

For information call
(626) 458-4300
LOS ANGELES COUNTY
2002-2003 STORMWATER
MONITORING REPORT

TABLE OF CONTENTS

ADA Information

Acronyms and Abbreviations

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 Location
     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    Sample Collection Methods
          3.2.2    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    Mass Emission Analysis
                   4.2.1.1    Comparison Study
                   4.2.1.2    Loading and Trend Analysis
                   4.2.1.3    Correlation Study
          4.2.2    Tributary Monitoring Analysis
          4.2.3    Water Column Toxicity Analysis
          4.2.4    Trash Monitoring Analysis
          4.2.5    Identification and Possible Sources
          4.2.6    Recommendations

Section 5      References

Table 1-1 Bioassessment Sampling Locations within Los Angeles County
Table 2-1 Land Use Distribution of Monitored Catchments for the Monitoring Program
Table 3-1 Analytical Methods for Constituents
Table 4-1 Summary of Hydrologic Data for Mass Emissions Stations
Table 4-2 2002-2003 Los Angeles County Storm Water Monitoring Analytical Data Inventory
Table 4-2a 2002-2003 Los Angeles County Dry Weather Monitoring Analytical Data Inventory
Table 4-3 2002-2003 Los Angeles County Wet and Dry Weather Monitoring Toxicity Data Inventory
Table 4-4 Comparison of 2002-2003 Mass Emissions Results with Standards
Table 4-5 Comparison of 2002-2003 Tributary Results with Standards
Table 4-6 2002-2003 Summary of Water Quality Exceedances for Mass Emission Stations
Table 4-7 2002-2003 Summary of Water Quality Exceedances for Tributary Monitoring Stations
Table 4-8a Summary of Toxicity Results - Dry Weather
Table 4-8b Summary of Toxicity Results - Wet Weather
Table 4-9 Total Supended Solids Results for Mass Emission Stations
Table 4-10 2002-2003 Estimated Total Suspended Solids Loadings
Table 4-11 Estimated Pollutant Loading
Table 4-12 2002-2003 Storm Season Trash Monitoring

Figure 1-1 Bioassessment Sampling Station Locations Within Los Angeles County
Figure 2-1 Mass Emission and Tributary Sampling Sites for 2003-2004
Figure 2-2 Ballona Creek (S01) at Sawtelle Blvd., Los Angeles
Figure 2-3 Malibu Creek (S01) at Piuma Rd., Unicorporated L.A. County
Figure 2-4 Los Angeles River (S01) 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 Rd., Santa Clara
Figure 2-9 Los Angele River Tributary Monitoring Stations
Figure 2-10 Aliso Creek (TS01) at Saticoy St., Reseda
Figure 2-11 Bull Creek (TS02) at Victory Blvd., Lake Balboa
Figure 2-12 Burbank Western System (TS03) upstream of Riverside Dr., Glendale
Figure 2-13 Verdugo Wash (TS04) at Jackson St., Glendale
Figure 2-14 Arroyo Seco Channel (TS05) at Griffin Ave., Montecito Heights
Figure 2-15 Rio Hondo Channel (TS06) at Beverly Blvd., Pico Rivera
Figure 4-1 Historic L.A. Monthly Wet Season Ranfall at Station#716, Ducommun St., Los Angeles
Figure 4-2 L.A. Annual (Wet Season) Rainfall at Station #716, Ducommun St., Los Angeles
Figure 4-3 Comparison of Water Quality Results with TDS
Figure 4-4 Loading Trend Analyses
Figure 4-5 Metals Concentrations vs. TSS
Figure 4-6 Total Suspended Solids (TSS) Concentrations - All Watersheds
Figure 4-7 Total Suspended Solids (TSS) Concentrations - Individual Watersheds

Appendices

 
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