The authors gratefully acknowledge the support of Bob Bastian, our USEPA Project Officer and coauthor for this book, and our other USEPA Project Officers for this study. Bob Bastian, Karen Klima, Virginia Kibler, and Dr. Mahesh Podar of USEPA's Office of Water all contributed to this research effort with their vision that, a quarter century after enactment of the 1972 Clean Water Act, an evaluation of the water quality improvements that could be attributed to federal funding by USEPA's Construction Grants Program and the Clean Water State Revolving Fund (CWSRF) was a feasible undertaking. Their guidance, encouragement, and challenging questions helped to shape the study documented in this book. This project was funded by the U.S. Environmental Protection Agency under the following contracts with Tetra Tech, Inc.: EPA-68-C3-0303, EPA-68-C1-0008, and EPA Purchase Order No. 7W-0763-NASA.

The authors gratefully acknowledge the efforts of many of our colleagues who assisted us in identifying, compiling, analyzing, and visualizing an enormous amount of data for this study. We acknowledge Alexander Trounov of Tetra Tech, Inc., for his expert assistance in the extraction and processing of data from USEPA's mainframe databases (STORET, Reach File Version 1, Permit Compliance System, Clean Water Needs Survey) and USGS streamflow databases. Patrick Solomon of Tetra Tech, Inc., is acknowledged for his expert assistance in transforming geographically based data sets into maps that are works of art. Timothy Bondelid of Research Triangle Institute (RTI) is acknowledged for his invaluable contributions of point and nonpoint source pollutant loading data, including the Reach File Version 1 transport routing database, which was developed as part of RTI's National Water Pollution Control Assessment Model (NWPCAM). With a professional career in water pollution investigations that began in Chicago, Illinois, with the U.S. Public Health Service during the early 1960s, Phill Taylor, our colleague at Tetra Tech, Inc., is acknowledged for his invaluable knowledge of the "early years" of water pollution control investigations and the insight stimulated by our frequent questions about historical water quality data archived in STORET. Phill's "corporate memory" and his personal library of reports documenting water pollution conditions during the 1950s and 1960s were instrumental in guiding and completing this research effort. The authors gratefully acknowledge the significant contributions of the late Ralph Sullivan in preparing material documenting the legislative and regulatory history of the Federal Water Pollution Control Act.

The authors wish to acknowledge the efforts of the Peer Review Team, whose insight and often critical observations undoubtedly increased the value and credibility of the study's results. The members of the Peer Review Team included:

• Mr. Tom Brosnan, National Oceanic and Atmospheric Administration

• Mr. Michael Cook, U.S. Environmental Protection Agency

• Mr. John Dunn, U.S. Environmental Protection Agency

• Dr. Mohammad Habibian, Washington Suburban Sanitation Commission

• Dr. Leo Hetling, Public Health and Environmental Engineering, New York State Department of Environmental Conservation (retired)

• Dr. Russell Isaacs, Massachusetts Department of Environmental Protection

• Dr. Norbert Jaworski, U.S. Environmental Protection Agency (retired)

• Dr. William Jobin, Blue Nile Associates

• Mr. Ken Kirk, American Metropolitan Sewerage Association

• Mr. John Kosco, U.S. Environmental Protection Agency

• Mr. Rich Kuhlman, U.S. Environmental Protection Agency

• Ms. Jessica Landman, Natural Resource Defense Council

• Mr. Ronald Linsky, National Water Research Institute

• Dr. Berry Lyons, University of Alabama

• Dr. Alan Mearns, National Oceanic and Atmospheric Administration

• Dr. Daniel Okun, University of North Carolina

• Mr. Steve Parker, National Research Council

• Mr. Richard Smith, U.S. Geological Survey

• Mr. Phill Taylor, U.S. Environmental Protection Agency and Tetra Tech, Inc. (retired)

• Dr. Red Wolman, Johns Hopkins University

Many state and local agency officials reviewed the case study chapters for accuracy and completeness. The authors want to specifically acknowledge the invaluable contributions and data sets provided by Alan Stubin and Tom Brosnan for the Hudson-Raritan estuary case study; by Cathy Larson for the Upper Mississippi River case study; by Tyler Richards for the Chattahoochee River case study; by Ed Santoro and Richard Albert for the Delaware estuary case study; and by Dr. Virginia Carter and Dr. Nancy Rybicki for the Potomac estuary case study. Jim Fitzpatrick (Hydro Qual, Inc.) and Dr. Wu-Seng Lung (Enviro Tech, Inc.) are acknowledged for providing the results of water quality model simulations for case studies of the Potomac, Delaware, James, and Upper Mississippi Rivers. The late Bob Reimold and his colleagues at Metcalf & Eddy Engineers, Inc., are acknowledged for their contributions to the case study of the Connecticut River.

The members of the Case Study Peer Review Team included:

• Mr. Richard Albert, Delaware River Basin Commission

• Mr. Tom Brosnan, National Oceanic and Atmospheric Administration

• Dr. Virginia Carter, U.S. Geological Survey

• Ms. Linda Henning, St. Paul Metropolitan Council Environmental Services

• Ms. Cathy Larson, St. Paul Metropolitan Council Environmental Services

• Dr. Nancy Rybicki, U.S. Geological Survey

• Mr. Alan Stubin, New York City Department of Environmental Protection

• Mr. Ed Santoro, Delaware River Basin Commission

• Ms. Pat Stevens, Atlanta Regional Commission

• Mr. Peter Tennant, Ohio River Valley Sanitation Commission

Finally, we recognize the cheerful cooperation and expert editing, graphic arts, and document production efforts of Marti Martin, Robert Johnson, Kelly Gathers, Krista Carlson, Emily Faalasli, Elizabeth Kailey, Melissa DeSantis, and Debby Lewis of Tetra Tech, Inc., in Fairfax, Virginia. Thanks for a great job!

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