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Tetra Tech. May 13,.1992. Reconnaissance survey of the lower Columbia River. Task 1: Summary of existing data and preliminary identification of problem areas and data gaps (2 volumes). Volume II: Appendices. Prepared for Lower Columbia River Bi-State Program. Tetra Tech, Inc., Redmond, WA. (TC 8526-01).

Tetra Tech. April 29, 1992. Reconnaissance survey of the lower Columbia River. Task 1: Final summary report. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 36 pp. (TC 8526-01).

Tetra Tech. August 22, 1991. Reconnaissance survey of the lower Columbia River. Task 2 report: List of sources of information to evaluate. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 8 pp. (TC 8526-02).

Tetra Tech. June 26, 1992. Reconnaissance survey of the lower Columbia River. Task 2 summary report: Inventory and characterization of pollutants. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 82 pp. (TC 8526-02).

Tetra Tech. May 22, 1992. Reconnaissance survey of the lower Columbia River. Task 2 data analysis report: Inventory and characterization of pollutants. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 202 pp. + appendices (TC 8526-02).

Tetra Tech. March 1992. Reconnaissance survey of the lower Columbia River. Task 3: Recommendations on conceptual modeling approaches and numerical models. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 31 pp. + appendix (TC 8526-03).

Tetra Tech. June 29, 1992. Reconnaissance survey of the lower Columbia River. Task 3: Review of hydraulic, hydrologic, sediment transport, and geomorphic characteristics of the lower Columbia River. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 46 pp. + appendix (TC 8526-03).

Tetra Tech. June 29, 1992. Reconnaissance survey of the lower Columbia River. Task 3 summary report: Review of physical and hydrologic characteristics. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 31 pp. (TC 8526-03).

Tetra Tech. February 1992. Reconnaissance survey of the lower Columbia River. Task 4: Review of biological indicators to support recommendations on a biological monitoring approach. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 45 pp. + appendices (TC 8526-04).

Tetra Tech. June 1992. Reconnaissance survey of the lower Columbia River. Task 4: Recommended biological indicators for the lower Columbia River. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc.. Redmond, WA. 32 pp. (TC 8526-04).