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r <br /> 2 Foot above the last ;lot 'When the annulus was filled with <br /> hydrated bentonite for 3 feet and the remainder of the annulus <br />' was sealed with neat cement A traffic box was placed over the <br /> well and cemented to the pavement { See Well Logs ) <br /> r <br /> The wells were developed by removing approximately 70 gallons of <br />' wator at whLah time the sediment was greatly reduced <br /> Approximately 24 to 48 hours later, the wells were surveyed, <br />' with a spirit lovel, to tie the tops of the casings to the local <br /> datum, measured for depth to water, and sampled ( See <br /> Protocols) . <br /> r <br /> SITE CHARACTERIZATION <br /> rYaagse Ton <br /> r The logs of the six wells indicate the unsaturated zone consits � <br /> predominately of silts and clays. A 5 foot acne of sand is <br /> located between 20 and 30 feet below the suface Another <br /> thicker sand layer begins at about 45 to 50 feet below the <br /> surface. The water table is presently located at 48 feet below <br /> rgrade within this sand layer. <br /> rWe have generated three geologic cross-sections of the site <br /> Lasted along the sides of the wells are the TPH readings <br /> r measured by the laboratory. The most contaminated well is BM-1 <br /> This well is located at the northern edge of the old excavation <br /> r The only other well with a4ycontamination above the 40 foot <br /> level it BM-5 it has a zone of contamination at the 15 to 20 <br /> foot level. This contamination is apparently caused by a clay <br /> rlense which dips from BM-1. to BM-5 The fact that no other � <br /> wells show contamination helps define the zero limits of the <br /> rcontaminant and also indicated the contaminant migrated almost <br /> vertically <br /> 1 <br /> r <br />' 4 <br />