Tetra Tech, Inc., was contracted by the Lower Columbia River Bi-State Program to conduct a supplemental reconnaissance survey of sediment and biota (fish and crayfish) contaminant levels in backwater areas of the lower Columbia River (Tetra Tech 1994). 15 stations were sampled for dioxins, furans, PCBs, metals, trace elements, cyanide, semi-volatile organic compounds, pheonolic compounds and polynuclear aromatic hydrocarbons, pesticides, PCB Arocolors, butyltin compounds and radionuclides. These samples were intended to expand the data base of the original reconnaissance survey reported in Tetra Tech (1993). Station latitude and longitude were recorded from geographic coordinates provided by a Magnavox MX 2000 Global Positioning System (GPS) Navigator System receiver. The GPS locational information was not corrected for the U.S. Department of Defense's Selective Availability, and therefore the GPS latitudes and longitudes provided are accurate to approximately 100 m.
Lower Columbia River Backwater Reconaissance Survey