prepared by U.S. Environmental Protection Agency, Region X ; prepared with the assistance of Engineering-Science, Inc. [and] Socio-Economic Systems, Inc
prepared jointly by Environmental Protection Agency, Region X, Municipality of Metropolitan Seattle, Washington State Department of Ecology ; with the assistance of James M. Montgomery, Consulting Engineers, Inc
prepared by U.S. Environmental Protection Agency, Region 10 with technical assistance from Jones & Stokes Associates, Inc., in association with Culp, Wesner and Culp
prepared by U.S. Environmental Protection Agency, Region X, with technical assistance from Jones & Stokes Associates, Inc. in association with Culp, Wesner and Culp and Gruen Gruen & Associates
prepared by U.S. Environmental Protection Agency, Region X, with technical assistance from Jones & Stokes Associates, Inc., in association with Culp, Wesner and Culp and Gruen Gruen + Associates
prepared jointly by Environmental Protection Agency, Region X, Municipality of Metropolitan Seattle, Washington State Department of Ecology ; with the assistance of James M. Montgomery, Consulting Engineers, Inc