Salinas Reservoir Water Quality Report
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Salinas Reservoir Water Quality Monitoring Report Water Year 2020 (October 2019 – September 2020) San Luis Obispo County Flood Control and Water Conservation District Prepared by: County of San Luis Obispo Department of Public Works Water Quality Laboratory Prepared for: United States Army Corps of Engineers Los Angeles District County of San Luis Obispo Salinas Reservoir Water Quality Monitoring Report Water Year 2020 (October 2019 – September 2020) Prepared for: United States Army Corps of Engineers Los Angeles District Prepared By: County of San Luis Obispo Department of Public Works Water Quality Laboratory Contributors: Kari Frances Gephart, Water System Chemist Nicholas Johnson, Assistant Plant Superintendent Salinas Reservoir Water Quality Monitoring Report for Water Year 2020 County of San Luis Obispo Water Quality Lab Table of Contents Summary ...................................................................................................................... 1 Section 1 Background and Reservoir Description ................................................... 2 1.1 Background……………………………………………………………………………………………………. 2 1.2 Description…………………………………………………………………………………………………….. 4 Section 2 Water Quality Management Objective .................................................... 5 Section 3 Monitoring Program .................................................................................. 6 3.1 Limnological…………………………………………………………………………………………………… 9 3.2 Nitrogen and Total Phosphate Nutrients……………………………………………………….. 9 3.3 Algae…………………………………………………………………………………………………………….. 10 3.4 Odor and Turbidity……………………………………………………………………………………….. 11 3.5 Hydrogen Sulfide………………………………………………………………………………………….. 11 3.6 Coliforms……………………………………………………………………………………………………… 11 3.7 Iron and Manganese…………………………………………………………………………………….. 12 3.8 General Mineral……………………………………………………………………………………………. 12 3.9 Trace Metals and Cyanide…………………………………………………………………………….. 13 3.10 Volatile Organic Compounds and Synthetic Organic Compounds………………. 13 3.11 Perchlorate…………………………………………………………………………………………………. 13 3.12 Total Organic Carbon…………………………………………………………………………………..14 Section 4 Creek/Watershed Inspections ................................................................ 15 Section 5 Quagga and Zebra Mussel Monitoring .................................................. 16 5.1 Boat Inspections…………………………………………………………………………………………… 16 5.2 Early Detection Monitoring…………………………………………………………………………… 17 Section 6 Operations ................................................................................................ 18 Section 7 References ................................................................................................. 19 Section 8 Appendices ................................................................................................ 20 8.1 Salinas Reservoir Limnology Data Temperature Profile at Salinas Dam Intake…… 20 8.1.1 Temperature Profile Data in Celsius ............................................................. 21 8.1.2 Dissolved Oxygen Profile ............................................................................... 22 8.1.3 Dissolved Oxygen Profile Data in mg/L ........................................................ 23 8.1.4 pH Profile at Intake ......................................................................................... 24 8.1.5 pH Profile at Intake Data ................................................................................ 25 8.1.6 pH of Intake in Use for WY 2020 ................................................................... 26 8.1.7 Water Visibility at Intake ................................................................................ 27 8.1.8 Intake Visibility Data at Intake in Feet ........................................................... 28 Salinas Reservoir Water Quality Monitoring Report for Water Year 2020 County of San Luis Obispo Water Quality Lab 8.1.9 Historical Graph of Visibility at Intake in Use ............................................... 28 8.2 Nitrogen and Phosphate Nutrient………………………………………………………………… 29 8.2.1 Intake/Raw Water Nutrients .......................................................................... 29 8.2.2 Alamo Creek Water Nutrients ....................................................................... 30 8.2.3 Salinas River Water Nutrients ........................................................................ 31 8.2.4 Salsipuedes Creek Water Nutrients .............................................................. 32 8.2.5 Toro Creek Water Nutrients .......................................................................... 33 8.2.6 V-Notch Water Nutrients ............................................................................... 34 8.3 Salinas Reservoir Algae Data………………………………………………………………………… 35 8.3.1 Graph of Algae Counts ................................................................................... 35 8.4 Salinas Reservoir Intake Odor and Turbidity Summary………………………………… 36 8.4.1 Intake in Use Threshold Odor and Turbidity ................................................ 36 8.4.2 Intake in Use Threshold Odor and Turbidity Data ....................................... 37 8.4.3 Intake Odor Profile 2020 ................................................................................ 38 8.4.4 Odor Profile Data at Intake in TON ............................................................... 39 8.4.5 Intake Turbidity Profile ................................................................................... 40 8.4.6 Turbidity Profile Data at Intake in NTU ......................................................... 41 8.4.7 Turbidity from Surface Sites .......................................................................... 42 8.5 Bacteriological Summary of all Sites Monitored…………………………………………….43 8.5.1 Coliform Data .................................................................................................. 43 8.5.2 Intake in Use/Raw Water Coliform Historical Trend .................................... 45 8.5.3 Historical Bacteriological Data for Alamo Creek .......................................... 46 8.5.4 Historical Bacteriological Data for Salinas Creek ......................................... 46 8.5.5 Historical Bacteriological Data for Salsipuedes Creek ................................. 47 8.5.6 Historical Bacteriological Data for Toro Creek ............................................. 47 8.6 Salinas Reservoir Metals Data………………………………………………………………………. 48 8.6.1 Raw Water Iron and Manganese ................................................................... 48 8.6.2 Raw Water Iron and Manganese Data .......................................................... 49 8.6.3 Historical Graph of Raw Water Iron and Manganese Concentration......... 50 8.6.4 Trace Metals and Cyanide Summary for all Sites Monitored ..................... 51 8.7 Salinas Reservoir General Mineral Data……………………………………………………….. 56 8.8 Salinas Reservoir Raw Water VOCs, SOCs and Perchlorate…………………………… 60 8.9 Creek/Watershed Inspection Checklist…………………………………………………………. 61 8.10 Salinas Reservoir Invasive Mussel Inspection Form……………………………………. 63 8.11 Operational Data Summary……………………………………………………………………….. 64 8.11.1 Salinas Reservoir Statistics WY 2020 ........................................................... 64 8.11.2 Salinas Reservoir Historical Operations Data ............................................ 65 8.11.3 Historical Graph of Water Delivered to SLO WTP Summary ..................... 66 8.11.4 Salinas Dam Release Summary Report for WY 2020 ................................. 67 8.12 Salinas Dam Release Report for WY 2020…………………………………………………….68 Salinas Reservoir Water Quality Monitoring Report for Water Year 2020 County of San Luis Obispo Water Quality Lab 8.12.1 October 2019 Dam Release Report ............................................................ 68 8.12.2 November 2019 Dam Release Report ........................................................ 69 8.12.3 December 2019 Dam Release Report......................................................... 70 8.12.4 January 2020 Dam Release Report ............................................................. 71 8.12.5 February 2020 Dam Release Report ........................................................... 72 8.12.6 March 2020 Dam Release Report ............................................................... 73 8.12.7 April 2020 Dam Release Report .................................................................. 74 8.12.8 May 2020 Dam Release Report ................................................................... 75 8.12.9 June 2020 Dam Release Report ................................................................... 76 8.12.10 July 2020 Dam Release Report .................................................................. 77 8.12.11 August 2020 Dam Release Report ............................................................ 78 8.12.12 September 2020 Dam Release Report ..................................................... 79 Table of Tables Table 1: Summary of Water Quality Monitoring WY 2020 for Salinas Reservoir ......................... 7 Table of Figures Figure 1: Santa Margarita Lake and Trib............................................................................................ 8 Index of Graphs and Tables Alamo Creek Water Nutrients ......................................................................................... 31 Algae Counts for WY 2018 .............................................................................................. 38