LOS ANGELES COUNTY
2008-09 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 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
