tailieunhanh - WATER QUALITY PROTECTION AND NONPOINT SOURCE POLLUTION CONTROL IN SAN FRANCISCO BAY

Recent re-analyses of time series studies have highlighted a second important epidemiological and statistical issue known as confounding bias. Pollution relative rate estimates for mortality= morbidity could be confounded by observed and unobserved time-varying confounders (such as weather variables, season, and in°uenza epidemics) that vary in a similar manner as the air pol- lution and mortality=morbidity time series. To control for confounding bias, smooth functions of time and temperature variables are included into the semi-parametric Poisson regression model | FINAL STAFF REPORT WATER QUALITY PROTECTION AND NONPOINT SOURCE POLLUTION CONTROL IN SAN FRANCISCO BAY October 2003 SAN FRANCISCO BAY CONSERVATION AND DEVELOPMENT COMMISSION 50 California Street Suite 2600 San Francisco California 94111 Information 415 352-3600 Fax 415 352-3606 Web site http e-mail info@ This report was prepared with financial assistance provided by the Coastal Zone Management Act of 1972 as amended administered by the Office of Ocean and Coastal Resource Management National Oceanic and Atmospheric Administration. CONTENTS CHAPTER 1. AN OVERVIEW OF NONPOINT SOURCE Definition of Terms Pollutants Point Source Nonpoint Pollutant Types. .9 Pollutant Sources and Six Major Categories of Nonpoint Source Urban Runoff Problems and Marinas and Recreational Boating Problems and Hydromodification Problems and Wetlands and Riparian Areas Benefits and CHAPTER 2. NONPOINT SOURCE POLLUTION IN SAN FRANCISCO San Francisco Extent of Pollution Estimated Pollutant Pollutants of Particular California s 303 d List TMDL Priorities Beneficial Impaired Waterbodies Pollutants Sources and TMDL Significant Water Quality Watershed Specific Pollutant Categories and Associated Pollutants of Urban Hydromodification Waterway Modification .37 Alteration of Wetland and Riparian Historical and Current Top Known Contamination Problems in San Francisco High Mercury Levels and Fish Consumption Advisories in San Francisco Other Contaminants of Concern Pesticides Hydrocarbons Trace Long Term Nonpoint Source Pollution Impacts Effects on Bay Current RMP Research Efforts. 48 CHAPTER 3. OVERVIEW OF NONPOINT SOURCE POLLUTION Federal Regulations Clean Water Federal Regulations Coastal .