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r ,. <br /> 7.0 CONCLUSIONS <br /> i <br /> Based on the results of this investigation, it appears that groundwater beneath the site generally <br /> appears to impacted by petroleum hydrocarbons. It appears that MTBE has migrated a short <br /> distance generally down-gradient of the site, in the vicinity of soil borings ATC-1, ATC-2, and <br /> ATC-3. The maximum MTBE concentration detected in the soil borings was 2,900 ug/1 at a <br /> depth of 20 feet bgs in soil boring ATC-5, which is located approximately S feet down-gradient <br /> of the pump island. <br /> A depth discrete groundwater sample (ATC-5-42) was obtained in order to vertically define the <br /> extent of petroleum hydrocarbons. Analytical results of groundwater sample ATC-5-42 indicate <br /> r� that TPH-G and BTEX were not detected in the groundwater sample. A relatively low <br /> concentration of MTBE (39 ug/1) was detected in this groundwater sample. However, the MTBE <br /> concentration in groundwater sample ATC-5-42 (deeper groundwater sample) was two orders of <br /> magnitude lower than groundwater sample ATC-5-20 (shallow groundwater sample). It <br /> therefore appears that petroleum hydrocarbon impact is limited primarily to shallow <br /> groundwater. <br /> r� <br /> 4� <br /> 1� <br /> i <br /> H:ILERWAMQS_132_WSREPORTSWrillrpt&x 9 ATC Associates Inc. <br /> �I <br />