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1 _ � ON�NT91 Q�R�K SER VIAS April 20, 1995 Project Number 113-26-03 F�V� 19 95 ohm Johnson 9S The Customer Company sF��CFs"�ITH 4457 Industrial Park Road Benicia, CA 94510 Subject: Groundwater Monitoring Report, Third Quarter, Cheaper! #37, 1-5 East Grant Line Road, Tracy, San Joaquin County, California Dear Mr Johnson- We are forwarding the third quarter's report for your facility at 15 East Grant Line Road, Tracy. The site location is shown in Figure 1. 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 140µ&/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 (220µg/L), benzene in MW4 (2.1 µg/L) and MW-3 (0 7µg/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 s direction to be toward the north Recycled Paper 190 East 7th Street a Pittsburg CA 94565-2317 0 FAX (510) 419-2566 • Phnne l41M 470.107.1