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Mr Harlin Knoll Environmental <br /> 9 November 2000 Resources <br /> Page 3 Management <br /> included in Table 3 Copies of the well sampling records and laboratory <br /> analytical results are included as Attachments B and C, respectively <br /> The ground water sampling results are summarized below <br /> Tank 1 Location <br /> The results of ground water samples collected at Tank 1 are presented in <br /> Table 1 As shown, the results of samples collected in the shallow wells <br /> were consistent with previous sampling events At MW-3 (located <br /> upgradient of the former tank location), no detectable concentrations of <br /> chemicals were detected At MW-1 and MW-4 (located downgradient of <br /> the former tank location), TPH-g and BTEX were detected at <br /> concentrations similar to those previously detected at these locations <br /> In the new, deep well installed at this tank site (MW-7), TPH-g and <br /> xylenes were the only compounds detected As shown in Table 1, these <br /> compounds were detected at concentration barely exceeding their <br /> • detection limits TPH-g was detected at a concentration of 59 <br /> micrograms per liter (µg/1), and xylenes were detected at a concentration <br /> of 11 Pg/1 Based on the sampling results at this location, it appears that <br /> the vertical extent of impacts in the tank 1 area have been defined <br /> Tank 2 Location <br /> The results of ground water samples collected at Tank 2 are presented in <br /> Table 2 As shown, the results of samples collected in the shallow wells <br /> were generally consistent with previous sampling events At MW-5 <br /> (located upgradient of the former tank location), minor concentrations of <br /> TPH-g, ethylbenzene, and xylenes were detected However, these <br /> concentrations barely exceeded the detection limits At MW-6 (located <br /> immediately downgradient of the former tank location), TPH-g and <br /> BTEX were detected at concentrations similar to, but less than, those <br /> previously detected in this well At MW-2 (located downgradient of the <br /> former tank Iocation), no detectable concentrations of chemicals were <br /> detected The decrease in concentrations at MW-6 and MW-2 appear to <br /> indicate that natural attenuation continues to decrease the chemical <br /> concentrations at this location <br /> In the new, deep well installed at this tank site (MW-8), TPH-g, toluene, <br /> ethylbenzene, and xylenes were detected As shown in Table 2, these <br /> compounds were detected at concentration slightly in excess of their <br />