Direct Potable Reuse Resource Document
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1700 North Congress Avenue Austin, Texas 78711 FINAL REPORT Direct Potable Reuse Resource Document April 2015 TWDB Contract No. 1248321508 Volume 1 of 2 In conjunction with: EOA, Inc. • Lloyd Gosselink Attorneys at Law • Nellor Environmental Associates, Inc. • Separation Processes, Inc. • Soller Environmental, LLC • Trussell Technologies, Inc. • Dr. Jörg Drewes, Technical University of Munich • Dr. Steven Duranceau, University of Central Florida • Dr. Desmond Lawler, University of Texas at Austin • Dr. Shane Snyder, University of Arizona • Dr. George Tchobanoglous, University of California at Davis THIS PAGE INTENTIONALLY LEFT BLANK 1700 North Congress Avenue Austin, Texas 78711 FINAL REPORT Direct Potable Reuse Resource Document April 2015 TWDB Contract No. 1248321508 Volume 1 of 2 In conjunction with: EOA, Inc. • Lloyd Gosselink Attorneys at Law • Nellor Environmental Associates, Inc. • Separation Processes, Inc. • Soller Environmental, LLC • Trussell Technologies, Inc. • Dr. Jörg Drewes, Technical University of Munich • Dr. Steven Duranceau, University of Central Florida • Dr. Desmond Lawler, University of Texas at Austin • Dr. Shane Snyder, University of Arizona • Dr. George Tchobanoglous, University of California at Davis THIS PAGE INTENTIONALLY LEFT BLANK DIRECT POTABLE REUSE RESOURCE DOCUMENT ACKNOWLEDGMENTS Alan Plummer Associates, Inc. would like to acknowledge the participation of the Texas Water Development Board, sponsors and technical team who provided valuable contributions to this document. Texas Water Development Board (lead sponsor agency) Dr. Sanjeev Kalaswad Dr. Robert Mace Erika Mancha Sponsors City of College Station/ Brazos Valley Groundwater Conservation District El Paso Water Utilities City of Houston City of Irving City of Lewisville City of Lubbock San Antonio Water System Upper Trinity Water Quality Compact City of Dallas City of Fort Worth North Texas Municipal Water District Trinity River Authority WateReuse Texas Technical Team Members: Kevin Alexander, Separation Processes, Inc. (currently Hazen and Sawyer) Dr. Christopher Boyd, Alan Plummer Associates, Inc. Brad Castleberry, Lloyd Gosselink Attorneys at Law Charles Cruz, Separation Processes, Inc. Alan Davis, Alan Plummer Associates, Inc. Dr. Jörg Drewes, Technical University of Munich Dr. Steven Duranceau, University of Central Florida Dr. Timothy Kennedy, Alan Plummer Associates (currently at Abilene Christian University) Dr. Desmond Lawler, University of Texas at Austin Dr. Ellen McDonald, Alan Plummer Associates, Inc. Margaret Nellor, Nellor Environmental Associates, Inc. Page | i DIRECT POTABLE REUSE RESOURCE DOCUMENT Dr. Brian Pecson, Trussell Technologies, Inc. Alan Plummer, Alan Plummer Associates, Inc. Dr. Adam Olivieri, EOA, Inc. Jeffrey Soller, Soller Environmental, LLC Dr. Shane Snyder, University of Arizona Dr. George Tchobanoglous, University of California, Davis (emeritus) Dr. Shane Trussell, Trussell Technologies, Inc. Page | ii DIRECT POTABLE REUSE RESOURCE DOCUMENT TABLE OF CONTENTS 1 Introduction .................................................................................................................... 1-0 1.1 Background on Water Reuse in Texas ...................................................................................... 1-1 1.2 Purpose of the Direct Potable Reuse Resource Document ....................................................... 1-4 1.3 Structure of Document ............................................................................................................... 1-4 1.4 Document Development ............................................................................................................. 1-5 2 Relevance of Chemical Contaminants of Concern in Texas ....................................... 2-0 2.1 Introduction ................................................................................................................................. 2-1 2.2 Summary of Chemical Contaminants of Concern and Constituents of Emerging Concern in Texas .......................................................................................................................................... 2-2 2.2.1 Statewide Raw Water Quality Trends ................................................................................ 2-2 2.2.2 Stakeholder Data................................................................................................................ 2-8 2.2.3 Data from Other Studies .................................................................................................. 2-10 2.3 Relevant Data from Outside Texas Related to Direct Potable Reuse ..................................... 2-12 2.4 Comparison of Contaminants of Concern in Available Data to Regulatory Standards and Guidance/Advisory Levels ........................................................................................................ 2-16 2.4.1 Groundwater Quality Comparison .................................................................................... 2-16 2.4.2 Surface Water Quality Comparison .................................................................................. 2-18 2.4.3 Treated Wastewater Quality ............................................................................................. 2-18 2.5 Review of the State of Analytical Technology .......................................................................... 2-19 2.5.1 Water Matrix ..................................................................................................................... 2-20 2.5.2 Analysis of CECs.............................................................................................................. 2-20 2.5.3 Considerations for Developing a Monitoring Program ..................................................... 2-21 2.5.4 Method Reporting Limits .................................................................................................. 2-22 2.5.5 Bio-analytical Methods ..................................................................................................... 2-23 2.6 Suggested Monitoring Framework for Utilities Interested in Pursuing Direct Potable Reuse .. 2-24 2.6.1 Indicator and Surrogate Concept ..................................................................................... 2-25 2.6.2 Phased Monitoring Program ............................................................................................ 2-29 2.6.3 Assessment of Performance ............................................................................................ 2-31 2.6.4 Re-evaluation of Indicators and Surrogates ..................................................................... 2-32 3 Water Quality Performance Targets for Direct Potable Reuse ................................... 3-0 3.1 Introduction ................................................................................................................................. 3-1 3.2 Constituents of Concern for Direct Potable Reuse .................................................................... 3-2 3.2.1 Microbial Contaminants ...................................................................................................... 3-2 3.3 Direct Potable Reuse Performance Targets .............................................................................. 3-7 Page | iii DIRECT POTABLE REUSE RESOURCE DOCUMENT 3.3.1 Targets for Microorganisms ............................................................................................... 3-7 3.3.2 Targets for Chemicals ...................................................................................................... 3-10 3.3.3 Targets for Aesthetics ...................................................................................................... 3-11 3.3.4 Targets for Corrosion Control ........................................................................................... 3-11 4 Enhanced Source Control for Direct Potable Reuse ................................................... 4-0 4.1 Pretreatment and Source Control Overview .............................................................................. 4-1 4.2 Federal Pretreatment Program .................................................................................................. 4-1 4.3 National Pretreatment Program Elements ................................................................................. 4-2 4.3.1 Legal Authority ................................................................................................................... 4-2 4.3.2 Procedures ......................................................................................................................... 4-3 4.3.3 Funding .............................................................................................................................. 4-3 4.3.4 Local Limits ........................................................................................................................ 4-3 4.3.5 Enforcement Response Plan ............................................................................................. 4-4 4.3.6 List of Industrial Users ........................................................................................................ 4-4 4.4 Federal Pretreatment Standards ................................................................................................ 4-4 4.5 Source Control Monitoring and Notifications .............................................................................. 4-5 4.7 Source Control Recommendations