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n <br /> C <br /> I.Randa11/3 April 1993 2 <br /> GROUNDWATER FLOW <br /> -- J <br /> Figure 5 is the potentiometric surface map of the shallow groundwater,based on depth-to-water <br /> measurements taken en 18 December 1989. Watsr-elevation data are tabulated in Table 2 <br /> i1 {la <br /> Hydrographs showing groundwater fluctuations over time are uicluded as Attachment B. Estimated <br /> , s <br /> groundwater flow was to the cut at P.gradient of about 11.5%. <br /> s GUMA E jrS <br /> Concentrations of TPFH and arematic hydrocaitions in grow,uwater appear to have remained <br /> ;#c the€ame,whey.compared to previous,%amples except fnr well MW-S.TPFH and aromatic hydrocarbons <br /> _ have increased approumately an order of magnitude for well MW-5,since the sampling in September <br /> - 1989,returning to the concentrations reported for the March 1989 sampling. <br /> We appreciate the opportunity to provide geologic and environmental consulting scnices to <br /> Chevron and trust this report meets your needs. If yon have any questions,please:all us at(415)457 <br /> 7.595. <br /> Sincerely, <br /> Wester ologi ource Inc. <br /> Tho ml.Echo <br /> - - Project Genf 't <br /> TIE:ag J <br />