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!L2 Groundwater Anal cal Laboratoa Results <br /> K.iff Analytical Labs issued Report W265 on.Pune 16,2005,wluch is presented as Appendix 3 <br /> Groundwater analytical results indicate maximum concentrations of petroleum hydrocarbons <br /> and related gasoline fuel constituents are present in the wells as follow <br /> Constituent Concentration Well <br /> benzene 520 µg/1 PT-MW3 (250 ug/l for PT-MW I and 4 6 ug/l for <br /> PT-MW6) <br /> toluene 1600 pg/l PT-MW1 <br /> ethylbenzene 1500 gg/l PT-MWi <br /> xylene 4800 µg/l PT-MWI <br /> TPH Gasoline 25,000 µg/l PT-MW1 (24,000pg/1 for PT-MW3, 9300 ug/l for <br /> PT-MW6) <br /> MTBE 7.7 µg/l PT-MW3 <br />' M Not Analyzed <br /> ET Not Analyzed <br /> TBA ND <br /> DIPE ND <br /> TAME ND <br /> 1,2-DCA 28 pg/l PT-MW3 <br /> 1,2-EDB 16 µg/1 PT-MW3 <br /> 4-3 Local Groundwater Gradient <br /> The groundwater surface for this portion of San Joaquin County flows southerly from the <br /> Mokelumne River to the site (San Joaquin County Department of Public Works, 2004) at a <br /> gradient of about 10 feet per mile or 0 0018 The overall regional flow direction of the I' <br /> groundwater zone is towards the topographic low portion of the Delta <br /> The local or onsite groundwater flow direction for this monitoring event is a slope toward South <br /> 40 degrees West with a gradient of 0 001 (Figure 5) This flow direction and gradient are <br /> consistent with previous quarterly monitoring events and are approximately the same as the <br /> regional flow direction and gradient as reported by San Joaquin County Department of Public <br /> Works <br /> M=\[Mn"rcuu=1aMan=Texwo\RepmUNQMR063005 7 <br />