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I <br /> Chevron Products Company 3 <br /> Former Chevron Service Station 9-8632 575 Grant Line Road,Tracy,California July 26 2002 <br /> • Benzene and toluene were detected once each at concentrations of 27 µg/1 in the <br /> . sample form MW-7 and 3 µg11 in the sample from MW-7, respectively <br /> • MtBE and 1,2-DCA were detected once each at concentrations of 4 µg11 in the <br /> sample from MW-6A and 4 gg/l in the sample from MW-6B, respectively <br /> Groundwater analytical results are summarized in Table 2 Groundwater chemical <br /> concentrations are shown graphically in Figure 3 Laboratory analytical reports and <br /> chain-of-custody documentation are presented in Attachment D Groundwater <br /> monitoring well development and sampling field data sheets are presents as Attachment <br /> E <br /> Well Surveying and Groundwater Gradient Interpretation. A state-licensed <br /> surveyor surveyed the newly installed wells to known vertical and horizontal datum <br /> Depth to groundwater measurements collected by GR during the second quarter 2002 <br /> monitoring and sampling event were utilized for interpretation of groundwater flow and <br /> gradient beneath the site The groundwater flow at the site was to the northwest at a <br /> gradient of 0 006 foot per foot (Figure 4) <br /> If there are any questions regarding the contents of this report, please call Brian Silva of <br /> SECOR at (916) 861-0400 extension 240 or Bob Cochran of Chevron at (925) 842- <br /> 9655 <br /> • Sincerely, <br /> SECOR International Incorporated <br /> Grotenhuls �AED Va Brain Silva <br /> Staff Scientist `�'� SCO (Q Project Manager <br /> � TT � <br /> GABLE <br /> Cr <br /> • No 636 0 <br /> ;A Exp o <br /> cott Gable SOF CA►-��a <br /> Principal Geologist, R G <br /> I 1Chevron1986321Reports198632 well install SA2002 doe <br />