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ON /: SSR ViS t2 January 11, 1995 Project Number 113-26-03 Mr John Johnson ✓� The Customer Company 4457 Industrial Park Road Benicia, CA 94510 Subject: Groundwater Monitoring Report, , Cheaper! #37, 15 East Grant Line Road, Tracy, San Joaquin County, California Dear Mr. Johnson: We are forwarding the ort for your facility at 15 East Grant Line Road, Tracy. Copies of this report should be forwarded to San Joaquin County and . the Regional Water Quality Control Board at the addresses at the end of this report. L Site History Two gasoline tanks were removed from the property on March 3, 1988. Groundwater was observed at 7 feet BGS (below grade surface). The tank excavation was emptied and water was sampled prior to the new tank installation Three groundwater monitoring wells were installed in April, 1988, and a fourth well in May, 1988. Water sample analysis in May, 1988, showed TPH-g (total petroleum hydrocarbons as gasoline) at 140 µg/L and benzene at 2.7µg/L. Monitoring well sampling was done by Parker Environmental Services in September, 1992. Free product (approximately one inch) was found in MW-4, which is by the tanks near the store front MW-2 had a soil blockage at six feet BGS TPH-g was present in MW-1 (220 µg/L), benzene in MW-1 (2.1 µg/L) and MW-3 (0.7 µg/L), toluene and xylenes in both, and ethylbenzene in MW-1 only. The soil blockage in MW-2 was removed from the well by Parker Environmental Services in December, 1992. Evidently a cup filled with dirt was lodged in the well casing. The cup was forced to the well bottom (29') and will not impair water,flow to the well- Well measurements taken at the same time showed the groundwater flow direction to be toward the north r Reowkq Paper 190 East 7th Street * Pittsburg, CA 94565-2317 9 FAX (510) 439-2566 • Phone (510) 439-1024