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LA County Flood Control District
Gary Hildebrand
Assistant Deputy Director/
Division Engineer


Terri Grant
Assistant Division Engineer

Rossana D'Antonio
Assistant Division Engineer

For information call
(626) 458-4300
1998-99 STORMWATER MONITORING REPORT

TABLE OF CONTENTS



Executive Summary

 
Acronyms and Abbreviations

 
Section 1    Introduction
     1.1    Purpose
     1.2    Report Organization
     1.3    Background
          1.3.1    Mass Emission Monitoring Program
          1.3.2    Land Use Program
          1.3.3    Critical Source/BMP Program

 
Section 2TWOSite Descriptions
     2.1    Site Selection
          2.1.1     Mass Emission Site Selection
          2.1.2     Land Use Site Selection
          2.1.3     Critical Source Site Selection
     2.2    Location and Drainage Area Descriptions
          2.2.1     Mass Emission Monitoring Sites
          2.2.2     Land Use Monitoring Sites
          2.2.3     Critical Source Monitoring Sites

 
Section 3THREEMethods
     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    River Toxicity Tests
          3.4.1    Dry Weather Methods
          3.4.2    Wet Weather Methods

 
Section 4FOURResults and Interpretation
     4.1    Hydrology: Precipitation and Flow
     4.2    Stormwater Quality
          4.2.1    Determination of Constituents of Concern for Analysis
          4.2.2    Mass Emission Element
          4.2.3    Land Use Element
          4.2.4    Critical Source Element

 
Section 5FIVEConclusions and Recommendations
     5.1    Objectives Achieved In 1998-99
     5.2    Mass Emission Program Conclusions
     5.3    Land Use Program Conclusions
     5.4    Critical Source Program Conclusions
     5.5    Recommendations

 
Section 6SIXReferences

 
Tables

 
Figures

 
Appendices
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