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... lfte <br /> Historical Background Information: West Clay Properties <br /> Page 7 of 7 <br /> (CPT02/137-141) and 6,600 gg/l total xylenes (CPT02/137-141). <br /> • HU-5: TPH-g and TPH-d were detected in the ground water sample CPT03/176-180 <br /> collected from HU-5 at concentrations of 5,400 µg/1 and 3,000 µg/1, respectively. BTEX <br /> constituents were detected at concentrations of 23 µg/1 (benzene), 330 µg/1 (toluene), 200 <br /> µg/1 (ethylbenzene) and 1,180 gg/l (total xylenes). <br /> Former UST Cluster <br /> Analytes of concern were not detected in ground water samples collected from the soil borings <br /> advanced near the former UST cluster area. <br /> IMPLICATIONS FROM VERTICAL ASSESSMENT <br /> Grab ground water samples collected from soil borings advanced near the former UST No.3 location <br /> contained detectable concentrations of TPH-g, TPH-d and BTEX constituents at depths as great as <br /> 180 feet bsg. Due to refusal, additional samples could not be collected from greater depths. In <br /> addition, detectible concentrations of target analytes were reported by the laboratory in grab ground <br /> water samples collected from soil borings advanced down-gradient of the former UST No.3 location <br /> at depths ranging from 74 to 78 feet bsg and 178 to 182 feet bsg. Neither the vertical nor the deep <br /> lateral extent of petroleum hydrocarbon-impacted ground water has been defined around the former <br /> UST No. 3 location. <br /> Target analytes were not detected above laboratory reporting limits in grab ground water samples <br /> collected from the former UST cluster area to depths as great as 182 feet bsg. In addition, target <br /> analytes were not detected above laboratory reporting limits in grab ground water samples collected <br /> from boring CHB-01, located down-gradient from the former UST cluster location. The vertical <br /> extent of impacted ground water appears to be defined at the UST cluster location;the lateral extent <br /> is not defined to the north and southwest. <br /> Advanced GeoEnvironmental,Inc. <br />