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a depth of 20 feet bgs in soil boring ATC-5, which is located approximately 8 feet down-gradient <br /> of the pump island. <br /> A depth discrete groundwater sample (ATC-5-42') was obtained in ofder to vertically define the <br /> extent of petroleum hydrocarbons. Analytical results of groundwater sample ATC-5-42 indicate <br /> that TPH-G and BTEX were not detected in the groundwater sample. A relatively low <br /> concentration of MTBE (39 ug/l) 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 /> I� <br /> �r <br /> R:\LetMNIArNQS_132_YAREPORTS\dritiryt.doc 2 ATC Associates Inc. <br />