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y1RON Ad -- _ 0 C1'. Fo jtl tu� � --- stR Ices Septembel 16, 1994 Project Numbe i 113-26-03 Mr John Johnson The Customer Company L/-103 4457 Industrial Park Road Beni cia, CA 94510 0 L Subject Groundwater Monitoring Re Laped #37, 15 East Giant Line Road, Tracy, Sa Joaquin County, ifornia Dear Mr Jolinson We aie forwarding the first quarter of monitoring (diming 1994) report foi your facility at 15 East Giant Line Road, Tracy Monitoring during the first and second quartets of 1994 was not performed by Parker Enviioriinental 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 I Site History Two gasoline tanks were removed fi om the property on March 3, 1988 Gioundwater was observed at 7 feet BGS (below grade surface) The tank excavation was emptied and wafer was sampled prior to the new tank Installation Thiee groundwater monitoring wells weI e Installed in Apid, 1988, and a fourth well in May, 1988 Water sample analysis in May, 1988, showed TPH-g (total pets oleum hydiocaibons as gasoline) at 140 lig/L and benzene at 2 7 µg/L Monitoring well sampling was done by Pat ker Environmental Set vices in September, 1992 Fiee product (appioximately one inch) was found in MW-4, which is by the tanks near the store fi ont MW-2 had a soil blockage at six feet BGS TPH-g was present in MW-1 (220 p.g/L), benzene in MW-1 (21 µg/L) and MW-3 (0 7 µg/L), toluene and xylenes in both, and ethylbenzene in MW-1 only 1 The boil blockage in MW-2 was removed from the well by Parker Environmental Set vices in December, 1992 Evidently a cup filled with dii t was lodged in the well casing The cup was forced to the -,Nell bottom (29') and will not impall water flow to Recycled Paper East 7th Street o Pittsburg, CA 94565-2317 m FAX (514) 439-2566 d Phone (510) 439-1024