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' ONA1 �r^Y w t Vice`' December 16, 1993 ' Project Number 113-26-02 Mr. john Johnson The Customer Company 4457 Industrial Park Road Benicia, CA 94510 Subject: Groundwater Monitoring Report, fourth Quarter, Cheaper' #37, 15 East Grant Line Road, Tracy, San Joaquin County, California Dear Mr. Johnson. We are forwarding the fourth quarter's report for your facility at 15 East Grant Line Road, liacy Copies of thus 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 Iwo gasoline tanks were removed from the property� P P Y o:i 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 inbtallation. 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 2.7 µg/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 IPH-g ' was present in MW-1 (220 µg/L), benzene in MW-1 (21 µg/L) and MW-3 (0.7 µg/L), toluene and xylenes in both, and ethylbenzene to 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 direction flow to be toward the north (see attached drawing). 46 Re(y(lyd Pulwr 190 East 7th Street • Pittsburg, CA 94565-2317 • FAX ($ip) 439-2566 • Phone (510) 439-1024