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Lake Berryessa Watershed Sanitary Survey Update

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Lake Berryessa Watershed Sanitary Survey Update LAKE BERRYESSA WATERSHED SANITARY SURVEY UPDATE FINAL REPORT JUNE 2013 PREPARED BY ARCHIBALD CONSULTING FOR NAPA COUNTY DEPARTMENT OF PUBLIC WORKS AND SOLANO COUNTY WATER AGENCY CONTENTS 1.0 Introduction ....................................................................................................................................... 1-1 2.0. Water Treatment Plants.................................................................................................................... 2-1 2.1 Lake Berryessa Resort Improvement District............................................................................... 2-1 2.2 Napa Berryessa Resort Improvement District ............................................................................. 2-3 3.0. Contaminant Sources ........................................................................................................................ 3-1 3.1 Recreational Use of Lake Berryessa ............................................................................................. 3-1 3.1.1 Background ........................................................................................................................ 3-1 3.1.2 Current Recreational Facilities at Lake Berryessa ............................................................... 3-6 3.1.3 Boater Education Efforts .................................................................................................. 3-12 3.1.4 Summary .......................................................................................................................... 3-13 3.2 Wastewater Treatment Facilities............................................................................................... 3-14 3.2.1 Wastewater Treatment Facilities in the Upper Putah Creek Watershed ......................... 3-15 3.2.2 Wastewater Treatment Facilities Serving Communities near Lake Berryessa .................. 3-18 3.2.3 Wastewater Treatment Facilities Serving Resorts and Recreation Areas near Lake Berryessa ................................................................................................................. 3-29 3.2.4 Wastewater Facilities on Lake Berryessa ......................................................................... 3-36 3.2.5 Summary .......................................................................................................................... 3-36 3.3 Agriculture/Pesticide Use .......................................................................................................... 3-37 3.3.1 Lake County...................................................................................................................... 3-37 3.3.2 Napa County .................................................................................................................... 3-39 3.3.3 Summary .......................................................................................................................... 3-40 3.4 Hazardous Materials Spills ......................................................................................................... 3-41 3.5 Wildfires .................................................................................................................................... 3-42 4.0 Water Quality..................................................................................................................................... 4-1 4.1 Microbiological Contaminants ..................................................................................................... 4-1 4.1.1 Lake Berryessa Resort Improvement District Coliform Data and Treatment Requirements .................................................................................................................... 4-1 4.1.2 Napa Berryessa Resort Improvement District Coliform Data and Treatment Requirements .................................................................................................................... 4-3 4.2 Turbidity ...................................................................................................................................... 4-3 4.3 Organic Carbon ............................................................................................................................ 4-3 4.4 Comparison to Maximum Contaminant Levels ............................................................................ 4-6 4.4.1 Lake Berryessa Resort Improvement District Constituents Exceeding Maximum Contaminant Levels ......................................................................................................... 4-10 4.4.2 Napa Berryessa Resort Improvement District Constituents Exceeding Maximum Contaminant Levels ......................................................................................................... 4-11 5.0 Findings and Recommendations ........................................................................................................ 5-1 5.1 2001 Findings and Recommendations ......................................................................................... 5-1 5.2 2013 Findings and Recommendations ......................................................................................... 5-6 5.2.1 Recreational Use of Lake Berryessa ................................................................................... 5-6 5.2.2 Wastewater Treatment Facilities ....................................................................................... 5-7 5.2.3 Agriculture/Pesticide Use ................................................................................................... 5-8 5.2.4 Microbiological Contaminants ........................................................................................... 5-9 6.0 References ......................................................................................................................................... 6-1 i FIGURES 2-1 LBRID and NBRID Water Service Areas ........................................................................................... 2-2 3-1 Lake Berryessa Watershed ............................................................................................................. 3-2 3-2 Recreational Facilities at Lake Berryessa ........................................................................................ 3-7 3-3 Location of Middletown WWTF ................................................................................................... 3-16 3-4 Location of Hidden Valley Lake Water Reclamation Facility......................................................... 3-17 3-5 Location of LBRID WWTF .............................................................................................................. 3-18 3-6 Location of Berryessa Wines WWTF............................................................................................. 3-21 3-7 Location of Spanish Flat WWTF .................................................................................................... 3-22 3-8 Location of NBRID WWTF ............................................................................................................. 3-24 3-9 Location of Turtle Rock WWTF ..................................................................................................... 3-26 3-10 Location of Capell Valley Mobile Home Park WWTF .................................................................... 3-27 3-11 Location of Circle Oaks WWTF ..................................................................................................... 3-28 3-12 Location of Reclamation WWTF ................................................................................................... 3-32 3-13 Location of Pleasure Cove WWTF ................................................................................................ 3-34 3-14 Location of Markley Cove WWTF ................................................................................................. 3-35 3-15 Acreage Devoted to Wine Grapes in Lake County ........................................................................ 3-37 3-16 Usage of Glyphosate and Copper Pesticides in Lake County ........................................................ 3-38 3-17 Usage of Glyphosate Pesticides in Napa County .......................................................................... 3-40 3-18 Usage of Copper Pesticides and Simazine in Napa County ........................................................... 3-40 4-1 Monthly Median Total Coliforms at the LBRID WTP Intake ............................................................ 4-2 4-2 Monthly Median E. coli at the LBRID WTP Intake ........................................................................... 4-2 4-3 Monthly Median Total Coliforms at the NBRID WTP Intake ........................................................... 4-4 4-4 Monthly Median E. coli at the NBRID WTP Intake .......................................................................... 4-4 4-5 Turbidity at the LBRID WTP Intake ................................................................................................. 4-5 4-6 Turbidity at the NBRID WTP Intake ................................................................................................ 4-5 4-7 TOC Concentrations at the LBRID WTP Intake ................................................................................ 4-6 4-8 TOC Concentrations at the NBRID WTP Intake ............................................................................... 4-6 4-9 Aluminum Concentrations at the NBRID WTP Intake ..................................................................
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