1994-2000 Stormwater Quality Monitoring Report

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LA County Flood Control District

Assistant Deputy Director/
Division Engineer:
Angela R. George

Assistant Division Engineers:
Keith Lilley
Paul Alva
Russ Bryden

For information call
(626) 458-4300

LOS ANGELES COUNTY
1994-2000 INTEGRATED
RECEIVING WATER IMPACTS
REPORT

TABLE OF CONTENTS

ADA Information

Acronyms and Abbreviations

Executive Summary

Section 1 Introduction

1.1 Purpose

1.2 Report Organization

1.3 Recap of Major Monitoring Elements

1.3.1 Santa Monica Bay Receiving Waters Impact Study

1.3.2 Mass Emissions

1.3.2.1 Pollutant Loading

1.3.3 Land Use Program

1.3.4 Critical Sources

1.4 Other Studies

1.4.1 Wide Channel Pilot Study

1.4.2 Low Flow Pilot Study

1.4.3 Aerial Deposition

1.4.4 El Niño Study by SCCWRP

1.4.5 River Toxicity

Section 2 Site Descriptions

2.1 1990 NPDES Permit - Sampling Sites

2.1.1 Automated Sampling Program-1990 NPDES Permit

2.2 1996 NPDES Permit - Sampling Sites

2.2.1 Site Selection

2.2.1.1 Mass Emission Site Selection

2.2.1.2 Land Use Site Selection

2.2.1.3 Critical Source Site Selection

2.2.2 Location and Drainage Area Descriptions

2.2.2.1 Mass Emission Monitoring Sites

2.2.2.2 Land Use Monitoring Sites

2.2.2.3 Critical Source Monitoring Sites

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

3.2.3 Sampling Frequency

3.3 Laboratory Analyses

3.3.1 Possible Constituents of Concern

3.3.2 Analytical Suite and Analytical Methods

3.3.3 Quality Assurance and Quality Control

3.4 Statistical Test Criteria

3.4.1 Land Use

3.4.2 Mass Emissions

Section 4 Results and Interpretation

4.1 Hydrology: Precipitation and Flow

4.2 Stormwater Quality

4.2.1 Overall Imperviousness

4.2.2 Bacterial Indicators

4.2.3 Stormwater Toxicity

4.2.4 Contaminated Sediments and Total Suspended Solids

4.2.5 Comparison of Mass Emission Concentrations to the Ocean
Plan, Basin Plan, and California Toxics Rule

4.2.6 Loading

4.2.6.1 GIS Loading Model

4.2.7 Constituents of Concern

4.2.8 Identification of Possible Sources

4.2.9 Best Management Practices for Critical Source Industries

Section 5 Conclusions and Recommendations

5.1 Objectives Achieved

5.1.1 Track Water Quality Status, Pollutant Trends and Pollutant
Loads, and Identify Pollutants of Concern

5.1.2 Monitor and Assess Pollutant Loads from Specific Land
Uses and Watershed Areas

          5.1.3    Identify, Monitor and Assess Significant Water Quality
                     Problems Related to Stormwater Discharges Within the
                     Watershed

5.1.4 Identify Sources of Pollutants in Stormwater Runoff

5.1.5 Identify and Eliminate Illicit Discharges

          5.1.6    Evaluate the effectiveness of Mgmt. Programs including
                     Pollutant Reductions Achieved by Implementation of
                     BMPs

5.1.7 Assess the Impacts of Stormwater Runoff on Receiving
Waters

5.2 Wide Channel Pilot Study

5.3 Low Flow Pilot Study

5.4 Future Monitoring Recommendations

5.4.1 Mass Emission Element

5.4.2 Land Use Element

5.4.3 Critical Source Element

5.4.4 TMDLs in Los Angeles County

5.4.5 Constituents of Concern

5.4.5.1 Bacteria

5.4.5.2 Contaminated Sediments

5.4.5.3 Stormwater Toxicity

5.4.6 Receiving Waters Impacts

5.4.7 Other Monitoring Activities

Section 6 References

Tables

Figures

Appendices

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