UPPER CIBOLO CREEK WATERSHED DATA REPORT April 2018 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. TABLE OF CONTENTS INTRODUCTION ............................................................................................................................. 6 WATERSHED LOCATION AND PHYSICAL DESCRIPTION ............................................................ 7 Location and Physical Description ............................................................................................... 7 Ecoregion .................................................................................................................................... 8 Climate ........................................................................................................................................ 9 Land Use ..................................................................................................................................... 9 History ....................................................................................................................................... 10 Water Quality Impairments ....................................................................................................... 10 Wastewater Treatment Facility Discharge ................................................................................ 10 On-Site Sewage Facilities .......................................................................................................... 11 Watershed Protection Plan ........................................................................................................ 11 Endangered Species and Conservation Needs ......................................................................... 12 WATER QUALITY PARAMETERS ................................................................................................. 13 Water Temperature ................................................................................................................... 13 Dissolved Oxygen ..................................................................................................................... 14 Specific Conductivity and Total Dissolved Solids ...................................................................... 14 pH .............................................................................................................................................. 15 Secchi Disk and Total Depth ..................................................................................................... 15 E. coli Bacteria ........................................................................................................................... 15 Orthophosphate ........................................................................................................................ 16 Nitrate-Nitrogen ......................................................................................................................... 16 Texas Surface Water Quality Standards .................................................................................... 16 DATA ANALYSIS METHODOLOGIES .......................................................................................... 17 Data Collection .......................................................................................................................... 17 Processes to Prevent Contamination .................................................................................... 17 Documentation of Field Sampling Activities .......................................................................... 17 Data Entry and Quality Assurance ............................................................................................. 18 Data Entry .............................................................................................................................. 18 Quality Assurance and Quality Control .................................................................................. 18 1 | Page Data Analysis Methods ............................................................................................................. 19 Standards and Exceedances .................................................................................................. 19 Methods of Analysis .............................................................................................................. 19 UPPER CIBOLO CREEK WATERSHED DATA ANALYSIS ............................................................ 22 Upper Cibolo Creek Maps ......................................................................................................... 22 Upper Cibolo Creek Watershed Trends over Time .................................................................... 23 Sampling Trends over Time ................................................................................................... 23 Trend Analysis over Time .......................................................................................................... 24 Air and Water Temperature ................................................................................................... 24 Total Dissolved Solids ............................................................................................................ 25 Dissolved Oxygen .................................................................................................................. 25 pH .......................................................................................................................................... 26 Turbidity ................................................................................................................................. 27 E. coli Bacteria ....................................................................................................................... 27 Nitrate-Nitrogen ..................................................................................................................... 28 Orthophosphate ..................................................................................................................... 29 UPPER CIBOLO CREEK UPSTREAM TO DOWNSTREAM TRENDS ........................................... 29 Total Dissolved Solids ............................................................................................................ 30 Dissolved Oxygen .................................................................................................................. 30 pH .......................................................................................................................................... 31 E. coli ..................................................................................................................................... 31 Nitrate-Nitrogen ..................................................................................................................... 32 Orthophosphate ..................................................................................................................... 32 UPPER CIBOLO CREEK WATERSHED SITE BY SITE ANALYSIS ................................................ 33 Site 80187– Upper Cibolo Creek @ the Upper Cibolo Creek Road Fifth Crossing .................... 40 Site Description ..................................................................................................................... 40 Sampling Information ............................................................................................................. 40 Air and Water Temperature ................................................................................................... 41 Total Dissolved Solids ............................................................................................................ 41 Dissolved Oxygen .................................................................................................................. 42 pH .......................................................................................................................................... 43 2 | Page E. coli ..................................................................................................................................... 43 Nitrate-Nitrogen ..................................................................................................................... 44 Orthophosphate ..................................................................................................................... 44 Secchi Disk and Total Depth .................................................................................................. 44 Field Observations ................................................................................................................. 44 Site 80904 – Upper Cibolo Creek Upstream of Boerne Lake .................................................... 44 Site Description ..................................................................................................................... 44 Sampling Information ............................................................................................................. 44 Air and Water Temperature ................................................................................................... 45 Total Dissolved Solids ............................................................................................................ 45 Dissolved Oxygen .................................................................................................................