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is Golden Grain company ` January 11 , 1989 l.a 202/799-5045.01 petroleum hydrocarbon concentrations in the soil . mW-4 showed with 1400 parts per million (pp1n1 of the highest concentrations, le taken at a depth of 21 total hydrocarbons in the soil camp feet. Water samples were collected from the wells on February 11 , les 1987 and analyzed for the same constituents l wereil mfound (Appendix V) . The highest hydro ca � in water from MW-2. Total dissolved gasoline hydrocarbons in groundwater from MW-2 was 200 ppm. y tions were initially surve ed on The we February 26, 1987, and groundwater elevations were monitored the shallow same day. Groundwater elevations indicated a relatively Y i (0,6%) hydraulic gradient with west-nompiled flgcSdand cpresented (Gradients are calculated from maps compiled by (G Appendices II through IV. ) San Joaquin Flood Control and E : Water conservation District Map, f Equal Elevation of "Lines o f� Water in Wells, Fall 1987" , shows a northwestward gradient in the � of Manteca. Given the gently gradient interpreted from vicinity wells s and the fact that monitoring y a review of SCS's map radient containing free product are located less thanofOfreetproduct does t the upgradient oc..urrence from the tank pit, of contamination. not necessarily indicate an off-site source Sampling and monitoring protocol, analytical methods, and 3 endix II. well construction --etails are discussed in App ;.., e a weals Water levels were monitored in the four wells onc eriod (Appendix III) , Gradients varied greatly over a six-week p 1987 to 2.6% on May 7, during this period, from 0.03% on April 9, SCS ranged from E 1987. The estimated flow directions reported by --- ------- 4, ,� north=northeast to .nor.thwest.. -.. 7