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LADY BIRD LAKE WATERSHED DATA REPORT September 2019

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LADY BIRD LAKE WATERSHED DATA REPORT September 2019 LADY BIRD LAKE WATERSHED DATA REPORT September 2019 The preparation of this report was prepared in cooperation with, and financed through, grants from the U.S. Environmental Protection Agency through the Texas Commission on Environmental Quality. TABLE OF CONTENTS INTRODUCTION ................................................................................................................................................ 4 WATERSHED LOCATION AND PHYSICAL DESCRIPTION ...................................................................................... 5 Location and Climate .................................................................................................................................... 5 Physical Description and Land Use (City of Austin) ........................................................................................ 5 History ......................................................................................................................................................... 5 Lower Colorado River Authority: Colorado River Watch Network ................................................................. 6 Water Quality Impairments .......................................................................................................................... 6 Wastewater Treatment Facility Discharge .................................................................................................... 6 Wastewater Protection Department, City of Austin ...................................................................................... 7 Algal Blooms and Lady Bird Lake................................................................................................................... 7 Endangered Species and Conservation Needs ............................................................................................... 8 WATER QUALITY PARAMETERS....................................................................................................................... 11 Water Temperature ................................................................................................................................... 11 Dissolved Oxygen ....................................................................................................................................... 12 Specific Conductivity and Total Dissolved Solids ......................................................................................... 12 pH .............................................................................................................................................................. 13 Secchi Disk and Total Depth ....................................................................................................................... 13 E. coli Bacteria ............................................................................................................................................ 13 Orthophosphate ......................................................................................................................................... 13 Nitrate-Nitrogen......................................................................................................................................... 14 Texas Surface Water Quality Standards ...................................................................................................... 14 DATA ANALYSIS METHODOLOGIES ................................................................................................................. 15 Data Collection ........................................................................................................................................... 15 Processes to Prevent Contamination ...................................................................................................... 15 Documentation of Field Sampling Activities ............................................................................................ 15 Data Entry and Quality Assurance............................................................................................................... 16 Data Entry .............................................................................................................................................. 16 Quality Assurance and Quality Control ................................................................................................... 16 Data Analysis Methods ............................................................................................................................... 17 Standards and Exceedances ................................................................................................................... 17 Methods of Analysis ............................................................................................................................... 17 1 | P a g e LADY BIRD LAKE WATERSHED DATA ANALYSIS ................................................................................................ 19 Lady Bird Lake Maps ................................................................................................................................... 19 Lady Bird Lake Watershed Trends over Time .............................................................................................. 20 Sampling Trends over Time .................................................................................................................... 20 Trend Analysis over Time............................................................................................................................ 20 Air and Water Temperature ................................................................................................................... 20 Total Dissolved Solids ............................................................................................................................. 21 Dissolved Oxygen ................................................................................................................................... 22 pH .......................................................................................................................................................... 23 E. coli Bacteria ....................................................................................................................................... 24 Nitrate-Nitrogen..................................................................................................................................... 25 LADY BIRD LAKE WATERSHED SITE BY SITE ANALYSIS ...................................................................................... 27 Site 15955 – Town Lake Below Tom Miller Dam.......................................................................................... 32 Site Description ...................................................................................................................................... 32 Sampling Information ............................................................................................................................. 32 Air and Water Temperature ................................................................................................................... 32 Total Dissolved Solids ............................................................................................................................. 33 Dissolved Oxygen ................................................................................................................................... 34 pH .......................................................................................................................................................... 35 E. coli ..................................................................................................................................................... 36 Nitrate-Nitrogen..................................................................................................................................... 37 Site 80229 – Town Lake Upstream of South 1st Street @ Stevie Ray Vaughn Statue .................................... 38 Site Description ...................................................................................................................................... 38 Sampling Information ............................................................................................................................. 38 Air and Water Temperature ................................................................................................................... 39 Total Dissolved Solids ............................................................................................................................. 40 Dissolved Oxygen ................................................................................................................................... 40 pH .......................................................................................................................................................... 41 E. coli ..................................................................................................................................................... 42 Nitrate-Nitrogen..................................................................................................................................... 43 Site 80326 – Town Lake @ West Bouldin Creek .......................................................................................... 44 Site Description .....................................................................................................................................
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