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�g <br /> z <br /> L� <br /> # Harding Lawson Associates <br />` were screened on site with a Gas Tech model 1314 calibrated to <br /> hexane. Soil samples with the highest Gas Tech readings from <br /> ., each boring, were delivered under chain--of-custody to a chemical <br /> ' <br /> testing laboratory. Logs of all borings are in Appendix A. <br /> All borings were drilled through asphalt or landscap<-d <br /> t _ <br /> areas. The shallow subsurface is primarily composed of fine- <br /> i grained silts, silty clayn, and clays. A coarse-grained stratum <br /> that was encountered at various depths across the site may be as <br /> f <br /> } thick as 12 feet in the central portion of the site. Coarse- <br /> grained materials are silty, clayey, or gravelly sands in the <br /> upper 2Q feet of soil. <br /> The boring for monitoring well MW-7 (a replacement well for <br /> MW-B) was drilled adjacent to the underground tanks and through <br /> _ the clayey sand backfill surrounding them. This backfill <br /> J. r extended to approximately 12 feet deep. From that depth to the <br /> bottom of. the boring (13.5 feet at this location) , silty clays <br /> were encountered. <br /> J <br /> Ground water was generally encountered between three and <br /> -five feet below grade. . Qualitative ground-water samples ("grab <br /> samples1 ) were collected from exploratory probes P-2 through P-4, <br /> P-6, and P-7. These probes had been extended approximately two <br /> feet,.belo _the water table and allowed to stabilize overnight <br /> r' 1.6f ore being.:checked for free- product and sampled. - - <br /> Y <br /> Water samples:were also .collected from the eight 2-inch PLIC <br /> '.- <br /> � �� <br /> monitoring-wells. Before sampling, the wells were developed. <br /> Water samples were collected with a stainless steel bailer and ? <br /> �rr <br />