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EXECUTIVE SUMMARY <br /> Two soil borings were drilled in August 2001 to determine whether oil and/or <br /> groundwater are contaminated by petroleum hydrocarbons at 10848 Copperopolis Road <br /> in eastern San Joaquin County. The site is the former location of Countryside Market, a <br /> gasoline service station and convenience store that ceased operations in 1993. <br /> One boring was drilled to a depth of 90 feet, encountering groundwater between 85.and <br /> 90 feet. Soil samples were collected at 5-foot intervals from 15 feet total depth, and a <br /> water sample was also collected. The second boring was drilled to 50 feet. A total of <br /> twelve soil samples from the two borings were submitted for laborat ry analysis. <br /> Total Petroleum Hydrocarbons in the gasoline range were detected in all eight of the soil <br /> samples from the deep boring and in the water sample. The maximum concentration was <br /> 15,000 parts per million at a depth of 50 feet. Hydrocarbons were de ected only in the <br /> deepest sample (50 feet) from the shallow boring.No methyl tertiabutyl ether(MTBE) <br /> was detected in any of the samples. The fact that the two undergro d storage tanks were <br /> reportedly not used during the 1�980's or 1990's, and were removed in 1993, accounts for <br /> the'absehce of MTBE. However, the laboratory did report tertiary butyl alcohol (another <br /> gasoline oxygenate) in the water sample. <br /> 1 <br />