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BMP Assessment Report Update BBMMPP AAsssseessssmmeenntt RReeppoorrtt UUppddaattee San Antonio River Authority Bexar Regional Watershed Management Partnership Texas Commission on Environmental Quality JJaammeess MMiieerrttsscchhiinn && AAssssoocciiaatteess,, IInncc.. EEnnvviiirroonnmmeennttaalll EEnnggiiinneeeerriiinngg JAMES MIERTSCHIN & ASSOCIATES, INC. ENVIRONMENTAL ENGINEERING P.O. BOX 162305 ◦ AUSTIN, TEXAS 78716-2305 ◦ (512) 327-2708 14 September 2010 Mr. Ernest Moran Environmental Services Department San Antonio River Authority PO Box 839980 San Antonio, Texas 78283-9980 RE: Final BMP Assessment Report Update Development of an Implementation Plan for Bacteria for Segment 1910 Salado Creek, Segment 1910A Walzem Creek, Segment 1911 Upper San Antonio River Dear Mr. Moran: James Miertschin & Associates, Inc (JMA) is pleased to provide the Final BMP Assessment Report Update for the project referenced above. This Final Update incorporates comments provided by stakeholders on the Draft Update Report that was released in April 2010. This Update will provide the basis for moving forward with implementation of control measures for bacteria impairment on the subject watercourses. We are grateful for the opportunity to assist the stakeholders with this important project. The work you accomplish here will likely provide a template for others around the State, showing the path forward to a successful implementation project. Yours truly, JAMES MIERTSCHIN & ASSOCIATES, INC. James Miertschin, PE, PhD JAMES MIERTSCHIN & ASSOCIATES, INC. ENVIRONMENTAL ENGINEERING P.O. BOX 162305 ◦ AUSTIN, TEXAS 78716-2305 ◦ (512) 327-2708 BMP ASSESSMENT REPORT UPDATE Development of an Implementation Plan for Bacteria for: Segment 1910 Salado Creek Segment 1910A Walzem Creek Segment 1911 Upper San Antonio River Prepared For: San Antonio River Authority 100 East Guenther St. San Antonio, Texas 78204 and Bexar Regional Watershed Management Partnership Prepared in Cooperation with: Texas Commission on Environmental Quality and U.S. Environmental Protection Agency The preparation of this report was financed through grants from the U.S. Environmental Protection Agency, through the Texas Commission on Environmental Quality Prepared By: James Miertschin & Associates, Inc. September 2010 TABLE OF CONTENTS Section Page LIST OF FIGURES ..................................................................................................................... iii LIST OF TABLES ....................................................................................................................... vi 1.0 INTRODUCTION ............................................................................................................. 1 1.1 PROJECT DEVELOPMENT ....................................................................................... 1 1.2 PROJECT BACKGROUND ........................................................................................ 3 1.3 REVIEW OF TMDL RESULTS .................................................................................. 8 1.4 STAKEHOLDER INVOLVMENT ........................................................................... 13 2.0 WATER QUALITY DATA REVIEW ........................................................................... 15 2.1 HISTORICAL SAMPLING ....................................................................................... 15 2.2 IMPLEMENTATION SAMPLING PLAN................................................................ 23 2.3 RESULTS OF ADDITIONAL MONITORING ........................................................ 26 2.4 ANALYSIS BASED UPON LOADINGS ............................................................... 145 2.4 ANALYSIS BASED UPON LOADINGS ............................................................... 145 2.5 INFERENCES REGARDING BACTERIA SOURCES ......................................... 190 3.0 WATER QUALITY MODEL ....................................................................................... 205 3.1 MODEL BACKGROUND ....................................................................................... 205 3.2 SALADO CREEK MODEL ENHANCEMENTS ................................................... 206 4.0 POINT SOURCES AND CONTROL MEASURES ................................................... 214 4.1 ASSESSMENT OF POINT SOURCES ................................................................... 214 4.2 CONTROL MEASURES ......................................................................................... 216 5.0 OVERVIEW OF MANAGEMENT MEASURES FOR NONPOINT SOURCES .. 219 5.1 SUMMARY OF POTENTIAL SOURCES ............................................................. 219 5.2 MANAGEMENT MEASURES FOR WASTEWATER COLLECTION SYSTEMS .. .................................................................................................................................. 228 5.3 MANAGEMENT MEASURES FOR SEPTIC SYSTEMS ..................................... 235 5.4 MANAGEMENT MEASURES FOR TRANSIENT WASTE ................................ 237 5.5 MANAGEMENT MEASURES FOR ANIMAL SOURCES .................................. 237 5.6 ASSESSMENT OF STRUCTURAL BMPS FOR URBAN RUNOFF ................... 242 5.7 ASSESSMENT OF NON-STRUCTURAL BMPS FOR URBAN RUNOFF ......... 278 5.8 MISCELLANEOUS SAN ANTONIO RIVER BMPS ............................................ 280 6.0 SHORT-TERM AND LONG-TERM MANAGEMENT MEASURES .................... 284 6.1 MANAGEMENT MEASURES FOR POINT SOURCES ...................................... 284 6.2 MANAGEMENT MEASURES FOR NONPOINT SOURCES .............................. 289 6.3 NINE ELEMENT SUMMARY TABLE ................................................................. 301 6.4 SUMMARY TIMETABLE FOR IMPLEMENTATION ........................................ 314 i 7.0 REFERENCES ............................................................................................................... 316 APPENDIX A – COMMENT SUMMARY TABLE ............................................................. 321 ii LIST OF FIGURES Figure 1-1: TMDL Implementation Plan Study Area .................................................................... 5 Figure 1-2: Densely Urbanized Portion of Study Area .................................................................. 6 Figure 1-3: USAR Bacteria Loads above Loop 410 (Urbanized Area) ....................................... 10 Figure 1-4: USAR Bacteria Loads below Loop 410 (Rural Area) .............................................. 10 Figure 1-5: Salado Creek Bacteria Loads .................................................................................... 11 Figure 2-1: Historical E. coli Geometric Means for Salado Creek .............................................. 17 Figure 2-2: Historical E. coli Geometric Means for USAR above Loop 410.............................. 20 Figure 2-3: Historical E. coli Geometric Means for USAR below Loop 410 ............................. 21 Figure 2-4: Stormwater TPDES Permit Sampling Stations ......................................................... 22 Figure 2-5: Stormwater Fecal Coliform Sampling Stations, 2000-2005 ..................................... 23 Figure 2-6a: September 2008 Synoptic Survey of Salado Creek and Walzem Creek ................. 41 Figure 2-6b: September 2008 Synoptic Survey of Salado Creek and Walzem Creek................. 42 Figure 2-7: September 2008 Synoptic Survey of USAR above Loop 410 .................................. 43 Figure 2-8: September 2008 Synoptic Survey of USAR below Loop 410 .................................. 44 Figure 2-9a: October 2008 Intensive Survey of Salado Creek and Walzem Creek..................... 47 Figure 2-9b: October 2008 Intensive Survey of Salado Creek and Walzem Creek .................... 48 Figure 2-10: October 2008 Intensive Survey of USAR above Loop 410 .................................... 49 Figure 2-11: October 2008 Intensive Survey of Olmos Creek .................................................... 50 Figure 2-12: October 2008 Intensive Survey of USAR below Loop 410 .................................... 51 Figure 2-13a: November 2008 Synoptic Survey of Salado Creek and Walzem Creek ............... 56 Figure 2-13b: November 2008 Synoptic Survey of Salado Creek and Walzem Creek ............... 57 Figure 2-14: November 2008 Synoptic Survey of USAR above Loop 410 ................................ 58 Figure 2-15: November 2008 Synoptic Survey of USAR below Loop 410 ................................ 59 Figure 2-16a: December 2008 Synoptic Survey of Salado Creek and Walzem Creek ............... 62 Figure 2-16b: December 2008 Synoptic Survey of Salado Creek and Walzem Creek ............... 63 Figure 2-17: December 2008 Synoptic Survey of USAR above Loop 410 ................................. 64 Figure 2-18: December 2008 Synoptic Survey of USAR below Loop 410 ................................ 65 Figure 2-19a: January 2009 Synoptic Survey of Salado Creek and Walzem Creek ................... 68 Figure 2-19b: January 2009 Synoptic Survey of Salado Creek and Walzem Creek ................... 69 Figure 2-20: January 2009 Synoptic Survey of USAR above Loop 410 ..................................... 70 Figure 2-21: January 2009 Synoptic Survey of USAR below Loop 410 .................................... 71 Figure 2-22a: February 2009 Synoptic Survey of Salado Creek and Walzem Creek ................. 74 Figure 2-22b: February 2009 Synoptic Survey of Salado Creek and Walzem Creek ................. 75 Figure 2-23: February 2009 Synoptic Survey of USAR above Loop 410 ................................... 76 Figure 2-24: February 2009 Synoptic
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