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Regional Water Quality Control Board(RWQCB). ' Based on the above-mentioned analytical results, it was concluded that the on-site soil contamination,although below regulatory action levels, was likely caused by the spilling of waste oil and motor oil at the former on-site service station. There was no indication of diesel or gasoline contamination. Groundwater was not sampled during this subsurface ' investigation. Agency Correspondence Ms. Linda Turkatte of the San Joaquin County Environmental Health Department (SJCEHD) contacted Building Analytics on May 9, 1996. Ms.Turkatte informed Building Y Analytics that the subsurface investigations at the neighboring sites had been completed, and that free floating product had been found on top of the aquifer at depths of 60 feet bgs. Assuming a southerly groundwater flow direction, Ms. Turkatte is considering the former I gasoline service station at the subject property to be a potential source. Building Analytics informed Ms. Turkatte of the findings of the February 1996 subsurface investigation. Agency Contact Building Analytics personnel visited the offices of the SJCEHD on August 26, 1996 in order to interview Ms. Turkatte of the agency, and to review environmental reports regarding the subject property and the nearby LUST sites. Building Analytics was informed that no records indicating the installation, abandonment or removal of underground storage tanks (USTs) at the subject property are on file with this agency. In addition,the latest available records were reviewed for the following sites in the vicinity of the subject property, which were identified as potential sources of contamination during the research: • Knowles/Roek Property, 102 South Wilson Way ' • Top Filling Station, 101 South Wilson Way • City of Stockton Right of Way, 102 South Wilson Way Roek Site The Roek site is located at 102 South Wilson Way, immediately southeast of the subject property. According to the latest groundwater monitoring results (November 1996), elevated levels of petroleum hydrocarbons were detected in groundwater samples collected from all wells,except well MW-7. Wells MW-11 and MW-12, located east of the former USTs, had TPH-g concentrations of 72 and 88 parts per billion (ppb) respectively, and BTEX concentrations were not detectable. The highest concentrations of TPH-g and BTEX were detected in samples collected from wells MW-2 and MW-13, located southeast and east of the former tanks.' Top Filling Station The Top Filling Station site is located at 101 South Wilson Way, immediately south of the subject property. According to the latest groundwater monitoring results (January 1997), TPH-g was detected in groundwater samples collected from wells MW-2, MW-3 and MW- 5 at concentrations of 94 ppb, 280 ppb and 12,000 ppb, respectively. In addition, benzene 1 Ground Zero Analysis, Inc., Groundwater Monitoring and Sampling Report, Knowles/Roek Property, 102 South Wilson Way, Stockton, California, November 1996. 2 197046a - Stockton