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t � <br /> sealed with duct tape, labeled for identification,*and placed in an ice chest for preservation <br /> and transportation to the laboratory. <br /> Sample PE1NE was taken from the base of the excavation in the northeast corner. The <br /> C backhoe dug through about three feet of concrete and penetrated approximately one foot <br /> of native clay and sampled at a depth of 18 feet. Sample PE2NE was taken from the east <br /> wall in the northeast corner at a depth of 11 feet. This sample was from the fill debris <br /> above the layered concrete. Sample PE3SE was taken out of the base of the excavation at <br /> a depth of 20 feet. At approximately 17 feet and below the concrete layer, sand (which <br /> may or may not be true formation) was present and had a strong petroleum odor. Below <br /> the sand was native clay. The sample was taken from the clay and no odor was detected. <br /> Sample PE4SE was taken from the east wall near the southeast corner of the excavation <br /> and was sandy fill material with no odor. Sample PE5SW came from the base of the <br /> excavation in the southwest corner at a depth of 17 feet. It was native clay with no odor. <br /> Sample PE6SW came from a depth of 11 feet in the south wall near the southwest corner. <br /> This sample was fill material and had no odor. Sample PL7S came from the base at the <br /> south end of the piping trench and was fill material with no odor. Sample PE8NW was <br /> taken from the base near the northwest corner of the pit at a depth of 17-1/2 feet. This <br /> sample was native clay with no odor. Sample PE9NW was taken in the fill material at a <br /> depth of -11 feet in the north wall near the northwest corner. At the time of excavating <br /> and sampling,'it was noted that seepage of water was slowly entering the excavation just <br /> below where sample PE9NW was taken. Since the entire excavation was free of water <br /> except for this small area in the northwest comer, it is not believed this seepage is due to <br /> a perched water table. Instead, it is felt that it is the result of surface drainage percolating <br /> down through the fill material at the site and being trapped above the layered concrete that <br /> was found when excavating. <br /> L These soil samples were delivered by the proper chain of custody to FGL (EXHIBIT Q <br /> for laboratory analyses of TPH-Diesel using EPA method 8015M and BETX using EPA <br /> method 8020. The laboratory results are included in EXHIBIT C. and shown on PLATE <br /> C IX and TABLE 2. <br /> LABORATORY RESULTS 5/10/94 <br /> All nine (9) soil samples analyzed by the laboratory for BETX were reported as non <br /> r detect for these constituents. TPH-Diesel was reported in samples PE3SE at 8200 ppm, <br /> L EE4SE at 180 ppm, PL7S at 620 ppm, and PE9NW at 350 ppm. The other five samples { <br /> were non detect for TPH-Diesel. Based on the laboratory analysis, the only contamination <br /> found after the over excavation was TPH-Diesel at a depth of 11 feet in the northwest <br /> comer of the pit and at depths from 9 to 20 feet in the piping trench and southeastern <br /> corner of the excavation. ' Using this information, it was decided that the best and most <br /> economical method to remove the remaining contamination was to do additional <br /> 5 <br />