San Bernard River Watershed Data Report April 2018 Table of Contents The preparation of this report was prepared in cooperation with, and financed through, grants from the Texas Commission on Environmental Quality and the U.S. Environmental Protection Agency. Introduction ................................................................................................................................................... 6 Watershed Location and Physical Description ............................................................................................. 7 Location and Climate ................................................................................................................................ 7 Physical Description and Land Use .......................................................................................................... 7 Wildlife and Wildlife Refuges .................................................................................................................. 7 History ...................................................................................................................................................... 7 TMDL & Watershed Protection ................................................................................................................ 8 Water Quality Parameters ............................................................................................................................. 9 Water Temperature ................................................................................................................................... 9 Dissolved Oxygen ..................................................................................................................................... 9 Specific Conductivity and Total Dissolved Solids.................................................................................. 10 pH ............................................................................................................................................................ 10 Salinity .................................................................................................................................................... 10 E. coli Bacteria ........................................................................................................................................ 10 Enterococci Bacteria ............................................................................................................................... 10 Orthophosphate ....................................................................................................................................... 11 Nitrate-Nitrogen ...................................................................................................................................... 11 Texas Surface Water Quality Standards ................................................................................................. 11 Data Analysis Methodologies ..................................................................................................................... 12 Data Collection ....................................................................................................................................... 12 Processes to Prevent Contamination ................................................................................................... 12 Documentation of Field Sampling Activities ...................................................................................... 12 Data Entry and Quality Assurance .......................................................................................................... 13 Data Entry ........................................................................................................................................... 13 Quality Assurance & Quality Control ................................................................................................. 13 Data Analysis Methods ........................................................................................................................... 14 Standards & Exceedances ................................................................................................................... 14 Methods of Analysis ........................................................................................................................... 14 San Bernard River Watershed Data Analysis ............................................................................................. 17 San Bernard River Maps ......................................................................................................................... 17 San Bernard River Watershed Trends over Time ................................................................................... 17 Sampling Trends over Time ................................................................................................................ 17 2 | P a g e Trend Analysis over Time ...................................................................................................................... 18 Air and water temperature................................................................................................................... 18 Total Dissolved Solids ........................................................................................................................ 19 Dissolved Oxygen ............................................................................................................................... 20 pH ........................................................................................................................................................ 21 Salinity ................................................................................................................................................ 22 Transparency ....................................................................................................................................... 23 Turbidity ............................................................................................................................................. 24 Nitrate-Nitrogen .................................................................................................................................. 22 Orthophosphate…………………………………………………………………………………...….26 Enterococci ........................................................................................................................................ 22 San Bernard River Watershed Site by Site Analysis .................................................................................. 24 Site 80770 – San Bernard River at Bates Allen Park .............................................................................. 38 Site Description ................................................................................................................................... 38 Sampling Information ......................................................................................................................... 39 Air and water temperature................................................................................................................... 40 Total Dissolved Solids ........................................................................................................................ 40 Dissolved Oxygen ............................................................................................................................... 41 pH ........................................................................................................................................................ 42 Transparency ....................................................................................................................................... 43 Site 81005 – San Bernard River at Hanson Riverside County Park ....................................................... 44 Site Description ................................................................................................................................... 44 Sampling Information ......................................................................................................................... 44 Air and water temperature................................................................................................................... 45 Total Dissolved Solids ........................................................................................................................ 46 Dissolved Oxygen ............................................................................................................................... 47 pH ........................................................................................................................................................ 48 Salinity ................................................................................................................................................ 49 Transparency ....................................................................................................................................... 50 Turbidity ............................................................................................................................................. 51 Nitrate-Nitrogen .................................................................................................................................. 52 Orthophosphate…………………………………………………………………………………...….53 Enterococci .......................................................................................................................................