LOS ANGELES COUNTY
2006-07 STORMWATER
MONITORING REPORT
TABLE OF CONTENTS
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 Best Management Practices 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 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 Stormwater 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 of Possible Sources
4.2.6 Recommendations
Section 5 References
Tables
Table 1-1. Bioassessment Site Locations within the County of Los Angeles
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. 2006-07 County of Los Angeles Stormwater Monitoring
Analytical Data Inventory
Table 4-2a 2006-07 County of Los Angeles Dry-Weather Monitoring
Table 4-3. 2006-07 County of Los Angeles Wet- and Dry-Weather
Monitoring Toxicity Data Inventory
Table 4-4. 2006-07 Summary of Water Quality Exceedances for
Mass Emission Stations
Table 4-5. 2006-07 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 2006-07 Total Suspended Solids Results For Mass
Emissions Stations
Table 4-8 2006-07 Estimated Total Suspended Solids and Total
Dissolved Solids Loads (Tons) for Mass Emission Stations
Table 4-9.1 Estimated Pollutant Loading for Ballona Creek
Table 4-9.2 Estimated Pollutant Loading for Malibu Creek
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 2006-07 Season Baseline Trash Monitoring within
Los Angeles River Watershed Management Area
Table 4.10b 2006-07 Season Baseline Trash Monitoring within
Ballona Creek Watershed Management Area
Figures
Figure 1-1 Bioassessment Monitoring Study Locations
Figure 2-1 Mass Emissions Sampling Sites
Figure 2-2 Ballona Creek 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 River Mass Emission Sampling Site
Figure 2-9 Tributary Areas in San Gabriel River Watershed
Figure 2-10 Big Dalton/Walnut Creek Tributary Area
Figure 2-11 Puente Creek Tributary Area
Figure 2-12 Upper San Jose Creek Tributary Area
Figure 2-13 Maplewood Channel Tributary Area
Figure 2-14 North Fork Coyote Creek Tributary Area
Figure 2-15 SD 21 (Artesia-Norwalk Drain) Tributary Area
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
Figures 4.3.1-4.3.21 Comparison of Water Quality Data with Applicable
Water Quality Standards – Ballona Creek
Figures 4.3.22-4.3.40 Comparison of Water Quality Data with Applicable
Water Quality Standards – Malibu Creek
Figures 4.3.41-4.3.61 Comparison of Water Quality Data with Applicable
Water Quality Standards – Los Angeles River
Figures 4.3.62-4.3.81 Comparison of Water Quality Data with Applicable
Water Quality Standards – Coyote Creek
Figures 4.3.82-4.3.102 Comparison of Water Quality Data with Applicable
Water Quality Standards – San Gabriel River
Figures 4.3.103-4.3.123 Comparison of Water Quality Data with Applicable
Water Quality Standards – Dominguez Channel
Figures 4.3.124-4.3.143 Comparison of Water Quality Data with Applicable
Water Quality Standards – Santa Clara River Creek
Figures 4.3.144-4.3.163 Comparison of Water Quality Data with Applicable
Water Quality Standards – Big Dalton/Walnut Creek
Figures 4.3.164-4.3.183 Comparison of Water Quality Data with Applicable
Water Quality Standards – Puente Creek
Figures 4.3.184-4.3.203 Comparison of Water Quality Data with Applicable
Water Quality Standards – Upper San Jose Creek
Figures 4.3.204-4.3.223 Comparison of Water Quality Data with Applicable
Water Quality Standards – Maplewood Channel
Figures 4.3.224-4.3.244 Comparison of Water Quality Data with Applicable
Water Quality Standards – North Fork Coyote Creek
Figures 4.3.245-4.3.265 Comparison of Water Quality Data with Applicable
Water Quality Standards – SD 21 (Artesia-Norwalk Drain)
Figures 4.4.1–4.4.55 Mass Emissions Loadings
Figures 4.4.56-4.4.57 Mass Emission Loadings Total Suspended Solids
Figures 4.4.58 Mass Emission Loadings Total Dissolved Solids
Figures 4.5.1-4.5.6 Correlation with Total Suspended Solids for
Santa Clara River
Figures 4.5.7-4.5.25 Correlation with Total Suspended Solids for
San Gabriel River
Figures 4.5.26-4.5.42 Correlation with Total Suspended Solids for
Upper San Jose Creek
Figure 4.6 Total Suspended Solids Concentrations at Mass Emission Stations
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
A- Hydrographs for catchments monitored during storms
B- Monitoring Results for Mass Emission and Tributary Monitoring Sites
C- Trash Photo 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
I- Ballona Creek Watershed Trash Compliance Monitoring Report
J- New Development Impacts Study in Santa Clara Watershed
