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Tetra Tech. January. 1993. Reconnaissance survey of the lower Columbia River. Task 6: Reconnaissance report. Volume 2: Appendix A, Data validation reports. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 8526-06).

Tetra Tech. May 17, 1993. Reconnaissance survey of the lower Columbia River. Task 6: Reconnaissance report. Volume 1: Reconnaissance report. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 454 pp. + glossary. (TC 8526-06).

Tetra Tech. January 1993. Reconnaissance survey of the lower Columbia River. Task 6: Reconnaissance report. Volume 3: Data tables, Appendices B, C, D, & E. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 8526-06).

Tetra Tech. May 25, 1993. Reconnaissance survey of the lower Columbia River. Task 7 conclusions and recommendations. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 270 pp. + appendix (TC 8526-07).

Tetra Tech. June 22, 1993. Lower Columbia River backwater reconnaissance survey. Sampling and quality assurance/quality control (QA/QC) plan. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 69 pp. (TC 9497-01).

Tetra Tech. December 1993. Lower Columbia River backwater reconnaissance survey. Reconnaissance report. Volume 2: Data validation reports. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 9497-06).

Tetra Tech. May 26, 1995. Lower Columbia River backwater reconnaissance survey. Reconnaissance report. Volume 1: Reconnaissance report. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 422 pp. (TC 9497-06).

Tetra Tech. December 1993. Lower Columbia River backwater reconnaissance survey. Reconnaissance report. Volume 3: Data appendix. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 9497-06).

Fuhrer, G.J., D.Q. Tanner, J.L. Morace, S.W. McKenzie, and K.A. Skach. 1996. Water quality of the lower Columbia River basin: analysis of current and historical water-quality data through 1994. U.S. Geoloaical Survey, Water-Resources Investigations Report 95-4294. U.S. Geological Survey, Water Resources Division, Portland, OR. 157 pp.

Tetra Tech. June 23, 1993. Lower Columbia River problem area confirmation and pollutant source studies. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. 44 pp. (TC 9214-03).