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Wu <br /> -ar Safi . <br /> :r ! 1, <br /> Ms.Diane Hinson, R.E.A.S. <br /> *larch L 1991 <br /> Pn�'c'.'. <br /> Ground @Vater Ant=lvticuf Results <br /> Each ground water sample was submitted for analysis of benzene,toluene,ethylbenzene,xylenes,and <br /> total petroleum hydrocarbons (TPH) is gasoline using US Environmental Protection Agency and <br /> California Department of Health Services approved methods. The analytical laboratory results of ground <br /> water samples collected on January 31, 1991 are summarized in Table 2. Previous results are also <br /> provided in Table 2 for comparison. copies or the certified laboratory reports for January 1991 are <br /> included in Enclosure B. <br /> Analytical laboratory results indicate an increase in the concentration of petroleum constituents frant <br /> October 1990 to January 1991. The concentrations in monitoring wells Mod-1 and MR'-5 increased <br /> gignificanfly more than other wells. These wells are locabd downgradient and therefore, the <br /> concentration of dissolved petroleum constituents is expected to increase more in these veils as dissolved <br /> constituents migrate with the ground water. <br /> EW—Plos—e M iuct Recnfflela <br /> A Westinghouse pneumatically-operated product-only pump was operated in monitoring well MW-7 <br /> during the period. Product level in the well has dropped from 1.05 feet to OAG feet. This pump will <br /> [ remain in monitoring well MW-7 during the next period. i <br /> Delta will collect groundwater samples the last v:..ek of April 1991 and submit a written report to the <br /> San Joaquin County,Department of Environmental}Icalth,the week beg!nniag June 17, 1991. If you <br /> have questions regarding the April sampling event or this letter report,please call us at(916)638-2085. <br /> Sincerely, <br /> DELTA EN','IRONMENTAL CONSUL;fANT5, INC. <br /> i <br /> IVB <br /> };u h J.Wes <br /> g <br /> Project Engineer <br /> � J1 <br /> Henry A.Dihm,P.E. <br /> Project Manager <br /> HAD:HJM:crd <br /> Enclosures <br /> Wenc: Ms.Barbara Mickelson,Delta Etivironmental Consultants,Inc. <br /> Mr.Jack Brw mad,Shell Oil Company <br /> Mr.Jim Masghau,Cantral Valley Regional Watsr Quality Control Board <br /> w <br />