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The North Bay Aqueduct Barker Slough Watershed Water Quality

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The North Bay Aqueduct Barker Slough Watershed Water Quality 1 State ,of California rl The Resou rces Agency Department of Water Resources r"l Division of Planning and Local Assistance Division of Operations and Maintenance r"-"j MWQI Copy Photocopy and RETURN The North Bay Aqueduct Barker Slough Watershed Water Quality Pete Wilson Douglas P. Wheeler David N. Kennedy Governor Secretary for Resources Director State of California The Resources Agency Department of Water Resources State of California n The Resources Agency DEPARTMENT OF WATER RESOURCES Division of Planning and Local Assistance D Division of Operations and Maintenance D [J The North Bay Aqueduct/Barker Slough D Watershed Water Quality D Phase I Report D D D o u. n D D ~ July 1998 D D [J [J n FOREWORD The California State Water Project Sanitary Survey Update Report, 1996 was written to fulfill the California Department of Health Services requirement of all large n utilities to assess their source surface waters and appropriate watersheds. The State Water Project's sanitary survey update was conducted by the Municipal Water Quality [J Investigations Program within the Division of Planning and Local Assistance. This study identified North Bay Aqueduct drinking water quality as being perhaps the most o vulnerable in the State Water Project. The MWQI Committee (comprised of the urban member of the State Water Contractors and staff from the U.S. Environmental Protection Agency, California o Department of Health Services, State Water Resources Control Board, and Department of Water Resources' Division of Planning and Local Assistance and Division of Operations and Maintenance) directed the MWQI Program to begin D conducting follow-up activities in the NBA Watershed to further assess the water quality . and potential contaminant sources. The North Bay Aqueduct/Barker Slough Watershed Water Quality Phase I Report summarizes the result of the first twelve months of this D study, which began in July 1996. Division of Operations and Maintenance staff provided monitoring assistance at D the Barker Slough Pumping Plant to collect data used in this report. In addition, an NBA Technical Advisory Committee composed of DWR and Solano County Water [] Agency staff (including laboratory and plant operations) helped guide the development of the study and interpretation of the results. D EJ William J. Bennett, Chief Division of Planning and Local Assistance D o D ~. D D iii o n D TABLE OF CONTENTS FOREWORD iii n ORGANIZATION : ix n EXECUTIVE SUMMARY \ xi n INTRODUCTION '............................................ .. 1 OBJECTIVES 3 D STUDY AREA DESCRIPTION 0 •• 5 Land Use 0 ••••••••••••••••••••• 5 Geology '._ 5 D Soils 6 Vegetation 6 D Hydrology 6 ···,0 WATER QUALITY OBSERVATIONS 9 WATER QUALITY RESULTS BY PARAMETER 11 Organic Carbon , 0 •• •••••••••••••••••••• •• 11 LJ Bromide 0· •• " 11 Total Trihalomethane Formation Potential 0 •• •• 12 Metals 12 o Escherichia coli 14 Pesticides 14 Field Parameters .............................. .. 14 U Storm Event and Yolo Bypass Results ;....... 15 DATA QUALITY 17 D Field Duplicates .............................................. .. 17 Field Blanks 17 o INTERPRETATION OF TRENDS " 0 ••••• 19 Wet Weather Trends ,.................. 19 Dry Weather Trends 22· o Water Quality at Barker Slough Pumping Plant Compared to the Sacramento River at Greenes Landing 24 ~ CONCLUSIONS 27 o REFERENCES . .. ...................................... .. 29 D SELECTED BIBLIOGRAPHY ~ 31 o v Figures Figure B-1, Barker Slough Watershed ",.............................. B-3 Figure B-2. Barker Slough Watershed Land Use. ....................... .. B-4 Figure B-3. Sacramento River Runoff at Freeport and Precipitation at Travis Air Force Base B-5 Figure B-4. Dissolved Organic Carbon Results for NBA Watershed Study .... .. B-6 Figure B-5. Ultraviolet Absorbance Values for NBA Watershed Study B-7 Figure B.-6. Specific Absorbance for NBA Watershed Study. .............. .. B-8 Figure B-7. Dissolved Bromide Results for NBA Watershed Study B-9 Figure B-8., TTHMFP for NBA Watershed Study " B-10 Figure B-9 Dissolved Aluminum Results for NBA Watershed Study. ....... .. B-11 Figure B-10. Dissolved Iron Results for NBA Watershed Study B-12 Figure B-11. Dissolved Manganese Results for NBA Watershed Study B-13 Figure B-12. Total Aluminum Results for NBA Watershed Study B-14 Figure B-13., Tota/lron Results for NBA Watershed Study B-15 Figure B-14. Total Manganese Results for NBA Watershed Study. ......... .. B-16 Figure B-15. E.aoli Results for NBA Watershed Study. .................. .. B-17 Figure B-16. pH Results for NBA Watershed Study. ..................... .. B-18 Figure B7'17. Dissolved Oxygen Results for NBA Watershed Study B-19 Figure B-18. Electrical Conductivity Results for NBA Watershed Study B-20 Figure B-19. Turbidity Results for NBA Watershed Study ; " B-21 Figure B-20. Temperature Results for NBA Watershed Study. ............. .. B-22 Figure 8-21. Alkalinity Values for NBA Watershed Study B-23 Figure B-22. Greenes Landing and Barker Association of Dissolved Organic Carbon B-24 Figure G-1. Tide Elevation at Barker Slough Pumping Plant G-3 Tables Table A-1. Water Quality Sampling Summary A-6 Table A-2. Cost of MWQI Analyses ,and Staff Time A-7 Table B-1. TOC at NBA Pumping Plant Compared to DOC and Particulate Organic Carbon ................... .. B-25 Table B-2. Data Summary Table B-26 Table B-3. Pesticides and Organic Compounds ....................... .. B-27 Table B-4. Yolo Bypass Sampling Event .....•........................ B-28 Table B-5. Sample Duplicate Recovery ; ~ .'. , . .. B-29 Table B-6. Filtered Field Blank Contamination Results B-29 Table B-7. Results of Unfiltered Field Blank Analyses " B-29 Table F-1. Phase /I Sampling Locations, Parameters, and Frequency F-6 Table F-2. Phase /I Budget. ....................................... .. F-7 Table G-1. Barker Slough Pumping (in CFS) ,................... G-4 vi I'0 n Appendices Appendix A. Phase I Workplan for the Barker Slough Watershed A-1 n Appendix B. Figures and Tables. B-1 Appendix C. Data Appendix C-1 Field Parameters C-3 D Minor Elements Results C-10 Trihalomethane Formation Potential Constituents ....... .. C-18 o Appendix D. USEPA and DHS Drinking Water Standards D-1 Appendix E. Barker Slough Pumping Plant Data E-1 Appendix F. Phase II Water Quality Monitoring Workplan F-1 [] Appendix G. Tide Elevation and Pumping Data .................... .. .... .. G-1 D D D o D EJ D o D ~ § o D vii [J D [J STATE OF CALIFORNIA D Pete Wilson, Governor THE RESOURCES AGENCY n Douglas P. Wheeler, Secretary for Resources DEPARTMENT OF WATER RESOURCES lJ David N. Kennedy, Director Robert G. Potter Raymond D. Hart Stephen L. Kashiwada o Chief Deputy Director Deputy Director Deputy Director L. Lucinda Chipponeri Susan N. Weber D Assistant Director for Legislation Chief Counsel D DIVISION OF PLANNING AND LOCAL ASSISTANCE William J. Bennett Chief, Division of Planning and Local Assistance D Dennis Letl Deputy Chief, Division of Planning and Local Assistance Phil Wendt· Chief, Water Quality Assessment Branch William Nickels Chief, Bryte Chemical Laboratory D Dan Otis Chief, Technical Services Section D Ray Tom Chief, Quality Assurance IQuality Control Unit [J This report was prepared under the supervision of Richard Breuer Chief, Municipal Water Quality Investigations Unit D By D A. Marc Commandatore Environmental Specialist II Denise Webster : .. :... Scientific Aid Marvin Jung Consulting Water Quality Scientist D Marvin Jung &Associates, Inc. {DWR B-80985) ~ MWQI Field Support David Gonzalez .. , Chief, Field Support Unit Ian Waters Associate Engineering Geologist D Walt Lambert Water Resources Engineering Associate D ix [J Lori Weisser ................... Water Resources Engineering Associate Diana Stoliker ............................... .. Water Resources Technician I Editorial Review, Graphics, and Document Production Lynda Herren Supervisor, Division Publications Brenda Main ........................................... .. Research Writer Edna Smith Office Assistant ProjectOversight, Review, and Comment By NBA Technical Advisory Committee John C.oburn ....................................... State Water Contractors Elaine Archibald Archibald and Wallberg Consultants Jaqueline McCall City of Vacaville David Okita ; Solano County Water Agency Victoria Shidell City of Benicia David Tompkins City of Vacaville Niles Fleege City of Fairfield Turan Ramadan City of Napa Ann Rice , : .. , " City of Vallejo Lawrence Joyce .. DWR - Operations and Maintenance, Chief, Water Quality Section Barry Montoya ............•........... DWR - O&M, Environmental Specialist III Richard Gage DWR - O&M, Delta Field Division Water Resources Engineering Associate x ~l D . I:XECUTIVE SUMMARY The California State Water Project Sanitary Survey Update Report, 1996 identified several water quality concerns in the Barker Slough watershed that affected D NBA as a source of drinking water. These concerns included high concentrations of organic carbon, trihalomethane formation potential, metals, and coliform bacteria. In response to these concerns, a study of the water quality of surface waters entering D NBA from Barker Slough, Calhoun Cut, and Lindsey Slough was initiated. n The study is being conducted in two phases. The first phase began on July 1, 1996 and ended on June 30,1997. An NBA Technical Advisory Committee was formed to develop a workplan to monitor water quality in the watershed. The NBA TAC o is comprised of representatives of the contractors using NBA water and Department of Water Resources' MWQI Unit and Division
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