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. 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. 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 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 2: Appendix A, Data validation reports. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 8526-06).

Tetra Tech. April 1992. Reconnaissance survey of the lower Columbia River. Laboratory data report. Volume 7: Dioxin and furan data for sediment. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 8526-06).

Tetra Tech. April 1992. Reconnaissance survey of the lower Columbia River. Laboratory data report. Volume 6: Dioxin and furan data for tissues. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 8526-06).

Tetra Tech. February 1992. Reconnaissance survey of the lower Columbia River. Laboratory data report. Volume 4: Tissue data, excluding dioxins and furans. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 8526-06).

Tetra Tech. August 1992. Reconnaissance survey of the lower Columbia River. Laboratory data report. Volume 5: Benthic invertebrate data. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 8526-06).

Tetra Tech. January 1992. Reconnaissance survey of the lower Columbia River. Laboratory data report. Volume 1: Sediment organic data. Prepared for Lower Columbia River Bi , State Committee. Tetra Tech, Inc., Redmond, WA. (TC 8526-06).