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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

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(626) 458-4300
LOS ANGELES COUNTY
2005-2006 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 Site 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 2005-2006 Los Angeles County Storm Water Monitoring Analytical Data Inventory
Table 4-2a 2005-2006 Los Angeles County Dry Weather Monitoring Analytical Data Inventory
Table 4-3 2005-2006 Los Angeles County Wet and Dry Weather Monitoring Toxicity Data Inventory
Table 4-4 2005-2006 Summary of Water Quality Exceedances for Mass Emission Stations
Table 4-5 2005-2006 Summary of Water Quality Exceedances 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 2005-2006 Total Suspended Solids Results for Mass Emission Stations
Table 4-8 2005-2006 Estimated Total Suspended Solids Loadings (Tons) for Mass Emission Stations
Table 4.9.1 Estimated Pollutant Loading for Ballona Creek
Table 4.9.2 Estimated Pollutant Loading for Malibu
Table 4.9.3 Estimated Pollutant Loading for Los Angeles River
Table 4.9.4 Estimated Pollutant Loading for Coyote Creek
Table 4.9.5 Estimated Pollutant Loading for San Gabriel River
Table 4.9.6 Estimated Pollutant Loading for Dominguez Channel
Table 4.9.7 Estimated Pollutant Loading for Santa Clara River
Table 4.10a 2005-2006 Storm Season Trash Monitoring within Los Angeles River Watershed Management Area
Table 4.10b 2005-2006 Storm Season Trash Monitoring within Ballona Creek Watershed Management Area

Figure 1-1 Bioassessment Monitoring Study Locations
Figure 2-1 Mass Emissions Sampling Sites
Figure 2-2 Ballona Cress Mass Emission Sampling Site
Figure 2-3 Malibu Creek Mass Emission Sampling Site
Figure 2-4 Los Angeles River Mass Emission Sampling Site
Figure 2-5 Coyote Creek Mass Emission Sampling Site
Figure 2-6 San Gabriel River Mass Emission Sampling Site
Figure 2-7 Dominguez Channel Mass Emission Sampling Site
Figure 2-8 Santa Clara Mass Emission Sampling Site
Figure 2-9 Tributary Areas in Ballona Creek Watershed
Figure 2-10 Adams Boulevard Drain Tributary Area
Figure 2-11 Benedict Canyon Drain Tributary Area
Figure 2-12 Centinela Creek Drain Tributary Area
Figure 2-13 Cochran Avenue Drain Tributary Area
Figure 2-14 Fairfax Avenue Drain Tributary Area
Figure 2-15 Sepulveda Channel Tributary Area
Figure 4-1 Historic Los Angeles Monthly Wet Season Rainfall at Station #716, Ducommun St., Los Angeles
Figure 4-2 Los Angeles Annual (Wet Season) Rainfall at Station #716, Ducommun St., Los Angeles
Figure 4.3
    Figure 4.3.1-4.3.35 Comparision of Water Quality Data with Applicable Water Quality Standards - Ballona Creek
    Figure 4.3.36-4.3.70 Comparision of Water Quality Data with Applicable Water Quality Standards - Malibu Creek
    Figure 4.3.71-4.3.105 Comparision of Water Quality Data with Applicable Water Quality Standards - Los Angeles River
    Figure 4.3.106-4.3.140 Comparision of Water Quality Data with Applicable Water Quality Standards - Coyote Creek
    Figure 4.3.141-4.3.175 Comparision of Water Quality Data with Applicable Water Quality Standards - San Gabriel River
    Figure 4.3.176-4.3.210 Comparision of Water Quality Data with Applicable Water Quality Standards - Dominguez Channel
    Figure 4.3.211-4.3.245 Comparision of Water Quality Data with Applicable Water Quality Standards - Santa Clara River Creek
    Figure 4.3.246-4.3.280 Comparision of Water Quality Data with Applicable Water Quality Standards - Centinella Creek
    Figure 4.3.281-4.3.315 Comparision of Water Quality Data with Applicable Water Quality Standards - Sepulveda Channel
    Figure 4.3.316-4.3.350 Comparision of Water Quality Data with Applicable Water Quality Standards - Benedict Canyon
    Figure 4.3.351-4.3.385 Comparision of Water Quality Data with Applicable Water Quality Standards - Adams Drain
    Figure 4.3.386-4.3.420 Comparision of Water Quality Data with Applicable Water Quality Standards - Fairfax Drain
    Figure 4.3.421-4.3.455 Comparision of Water Quality Data with Applicable Water Quality Standards - Cochran Drain
Figure 4.4.1-4.4.44 Mass Emissions Loadings
Figure 4.5.1-4.5.20 Correlation with TSS for Santa Clara River
Figure 4.5.21-4.5.40 Correlation with TSS for Ballona Creek
Figure 4.5.41-4.5.60 Correlation with TSS for Adams Drain Creek
Figure 4.6 Total Suspended Solids Concentrations
Figure 4.7.1 Total Suspended Solids Concentrations at Ballona Creek
Figure 4.7.2 Total Suspended Solids Concentrations at Malibu Creek
Figure 4.7.3 Total Suspended Solids Concentrations at Los Angeles River
Figure 4.7.4 Total Suspended Solids Concentrations at Coyote Creek
Figure 4.7.5 Total Suspended Solids Concentrations at San Gabriel River
Figure 4.7.6 Total Suspended Solids Concentrations at Dominguez Channel
Figure 4.7.7 Total Suspended Solids Concentrations at Santa Clara River

Appendices

 
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