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[ !U Groundwater Analytical Laboratory Results <br /> Kiff Analytical Labs issued Report#45572 on August 31,2005,which is presented as Appendix 3 <br />` Groundwater analytical results indicate maximum concentrations of petroleum hydrocarbons and <br /> related gasoline fuel constituents are present in the wells as follow <br /> Constituent Concentration Well <br /> benzene 70 µg/1 PT-MW 1 (7 0 ug/l for PT-MW6, 3 7 ug/1 for PT- <br /> MW2) <br /> toluene 36 µg/1 PT-MWl <br /> ethylbenzene 53 µg11 PT-MW1 <br /> xylene 130 pg/1 PT-MWl <br /> TPH as Gasoline 13,000 µg/1 PT-MW6 (3,600 ug/1 for PT-MW3, 3000 ug/l for <br /> PT-MW1 and 140 for PT-MW2) <br /> MTBE 1 1 jig/l PT-MW3 <br /> M Not Analyzed <br /> ET Not Analyzed <br /> E TBA ND <br /> DIPE ND <br /> TAME ND <br /> 1,2-DCA 5 4 µg/1 PT-MW3 (2 7 µg/1 in PT-MW 1) <br /> 1,2-EDB 2 4 µg/1 PT-MW3 <br /> 1 • 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 0 002 The overall regional flow direction of the 1' <br /> groundwater zone is towards the topographic low portion of the San Joaquin Delta area <br /> The local or onsite groundwater flow direction for flus monitoring event is a slope toward South <br /> 45 degrees West with a gradient of 0 002 (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 /> 0 <br /> ni=\n\Uavuo,e„ranruawr \Repofu\QMxot231os wo 7 <br />