Fort Lewis, Washington
In September 1986, a field investigation was conducted at the Old Fire Fighting Training Pit to assist in the preparation of a Resource Conservation and Recovery Act (RCRA) Part B permit application for Fort Lewis. Twenty test pits were dug within a 100-ft-diameter area thought to encompass the Old Fire Fighting Training Pit. Twelve composite soil samples were collected and analyzed for 56 SVOCs using EPA Method 8270.
In September 1987, three borings were advanced to a depth of 10 ft using a 4-inch diameter hollow-stem auger. Eight soil samples were collected using a split-spoon sampler and analyzed for SVOCs and VOCs, pesticides and PCBs, and dioxins and dioxin homologues.
Between September 1993 and July 1994, Woodward-Clyde conducted a limited field investigation to determine if the previous practices at the Old Fire Fighting Training Pit resulted in contamination of the uppermost aquifer beneath the site. The investigation included installation of three monitoring wells, an evaluation of the groundwater gradient, and groundwater sampling and analysis. Groundwater samples were collected in November and December 1993 and analyzed for VOCs, SVOCs, low-level PCBs, metals, cyanide, and dioxins and furans.
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