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No Further Action Request Section 2 0 Former American Forest Products Facility 2/16/2006 URS Project No 17322736 Page 2-2 feet in the ground, and temporary wells were installed using 2-inch-diameter PVC casing, with 10 feet of 0 020 slot screen from 65 feet bgs to 55 feet bgs A filter pack of#3 sand was installed from 65 feet bgs to approximately 53 feet bgs After developing and purging by bailing and pumping ten casing volumes of water, the wells were sampled using disposable bailers The samples were stored on ice and transported under chain-of-custody protocol to Kiff Analytical LLC of Davis, California, for analysis of VOCs by EPA Method 8260B r23 IN SITU GROUNDWATER SAMPLING ANALYTICAL RESULTS ' The four in situ groundwater samples collected in July and September 2005 were analyzed for VOCs by EPA Method 8260B The full analytical results are presented in Appendix B Table 2 presents a summary of the results for detected constituents URS conducted a limited quality control review of the data, full data validation was not performed The limited review indicates the analytical results are usable without qualification 1,2-DCA was not detected in any of the four samples Chloromethane was reported in one sample, HP-9, at a concentration of 1 9 Vg/]L Chloroform was reported in HP-12 at a concentration of 0 76 µg/l, Toluene was reported in HP-9 at a concentration of 16 pg/L, and PCE was reported in all four samples at concentrations ranging from 14 pg/L in HP-12 to 5 1 µg/L in HP-10 With one exception all of the results were below the respective California Department of Health Services (DHS) primary maximum contaminant levels (MCLS) The result for PCE in HP-10 of 5 1 µg/l- was ' slightly above the MCL of 5 0 µg/L MCLS are set by the DHS at concentrations that represent no adverse health risks E Vero ectSlURS1AM2005 DCA lnvesti ation\HP investigation Re ort1AFP 2005 Report WP-TC-Rev02 doc g g p