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r� otvM�n,T9 r s jr nti _41 71 PQ VKE S8R V I February 25, 2000 Project Number 113-26-04 Mr John Johnson Lo P The Customer Company 4457 Industrial Park Road Benicia, CA 94510 Subject Groundwater Monitoring Report, Former Cheaper! #37, 15 East Grant Line Road, Tracy, San Joaquin County, California Dear Mr Johnson We are forwarding this quarter's report for the subject facility at 15 East Grant Line Road, Tracy The site location is shown in Figure 1 Copies of this report will be forwarded to San Joaquin County and the Regional Water Quality Control Board at the addresses at the end of this report 1. 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 pg/L and benzene at 2 7 pg/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 to MW-1 (220 pg/L), benzene in MW-1 (2 1 pg/L) and MW-30 7 toluene and xylenes in both, and ethylbenzene in MW-1 only ( lag/L)' 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 190 Fast 7th SULCt - PlItSburg, CA 9456S-2;17 • FAX (92�) 439-2566 - Yhone (925) 439-1024 0