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Published on January 12, 2008

Author: Susett

Source: authorstream.com

Slide1:  Bacteria Total Maximum Daily Load Task Force Kevin Wagner Slide2:  THE ISSUE – BACTERIA 197 waterbodies (i.e. streams, rivers, lakes, bays) do not meet bacteria water quality standards and are considered “IMPAIRED” 183 - contact recreation use (swimming) 14 - oyster water use (oyster harvest) #1 Cause of Impairment in TX! 1 in 3 rivers in U.S. impaired Bacteria: Number One Water Quality Contaminant:  Bacteria: Number One Water Quality Contaminant Sources of bacteria Slide5:  TO ADDRESS THE IMPAIRMENTS Develop TMDLs & TMDL Implementation Plans What is a TMDL? TMDL = WLA + LA + MOS + FG A TMDL outlines: Pollution reductions needed to restore water quality in “impaired” water bodies Where reductions will come from [point sources (WLA) and/or nonpoint sources (LA)] Slide6:  BACTERIA TMDL ISSUES As the first round of bacteria TMDLs were completed, a number of issues surfaced: Inadequate communication within the TMDL process Appropriateness of the water quality standards questioned Better tools and science needed Slide7:  How will Texas address these bacteria TMDL issues? WORKING TOGETHER!!! Triennial Water Quality Standards Review Process Bacteria TMDL Task Force Lead by Dr. Allan Jones, TWRI Sept. 27th TCEQ/TSSWCB Meeting Slide8:  Bacteria TMDL Task Force 7 Members: George DiGiovanni, TAES-El Paso Larry Hauck, TIAER Allan Jones, TWRI Joanna Mott, Texas A&M-Corpus Christi Hanadi Rifai, University of Houston Raghavan Srinivasan, Texas A&M George Ward, UT-Austin Slide9:  Expert Advisors to Task Force ~40 members formed to provide input represent various stakeholder perspectives Slide10:  Review EPA TMDL guidelines and approaches taken by selected states to TMDL and implementation plan development. 2. Evaluate scientific tools, including microbial fate and transport modeling, microbial source tracking, and others. 3. Suggest alternative approaches to TMDL development , emphasizing scientific quality, timeliness, and cost effectiveness. Task Force Scope of Work Slide11:  4. Suggest alternative approaches to TMDL implementation plan and watershed protection plan development, emphasizing scientific quality, timeliness, and cost effectiveness. 5. Develop a 3- to 5-year science roadmap to guide and improve our understanding of microbial fate and movement in Texas environments. Task Force Scope of Work Slide12:  Oct. 31 – First DRAFT sent out Nov. 13 – Comments on First DRAFT due Nov. 27 – Task Force Meeting/Teleconference Dec. 4 – Second DRAFT Dec. 15 – Response to Second DRAFT due Dec. 18 – Task Force Meeting/Teleconference Jan. 8 – Third DRAFT delivered to TCEQ and TSSWCB Schedule Slide13:  Introduction Bacteria Fate & Transport Models – Srini and Hanadi Bacteria Source Tracking – DiGiovanni and Mott Recommended Decision-Making Process Research and Development Needs – Hauck and Ward Appendices 1-EPA Guidelines 4-Task Force Personnel 2-State Approaches 5-Comments 3-Model Descriptions Components of Report Slide14:  Statistical and mass Balance Bacteria Models Load Duration Curves Mass Balance Method In-Stream Bacteria Models HSPF SWAT SWMM WASP Bacteria Fate & Transport Models Slide15:  ERIC-PCR Ribotyping Pulse Field Gel Electrophoresis Kirby-Bauer Antibiotic Resistance Analysis Bacteria Source Tracking Slide16:  Kevin Wagner Project Manager Texas Water Resources Institute 1500 Research Parkway, Suite A240 2118 TAMU College Station, TX 77843.2118 979.845.2649 979.845.8554 (fax) klwagner@ag.tamu.edu http://twri.tamu.edu Contact TWRI:

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