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' 4�2 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 140 µg11 PT-MWI <br /> toluene 200 µg/I PT-MW 1 <br />' ethylbenzene 320 µg/1 PT-MW 1 <br /> xylene 1200 µg/l PT-MW 1 <br /> TPH as Gasoline 16,000 µg/I PT-MW6(10,000 ug/l for PT-MWI; 3200 ug/l for <br />' PT-MW3 and 79 for PT-MW2) <br /> MTBE 1 8 µg/1 PT-MW I <br /> M Not Analyzed <br />' ET Not Analyzed <br /> TBA ND <br /> DIPE ND <br />' TAME ND <br /> 1,2-DCA 5 1 µg/1 PT-MW3 (4.0 µg/1 in PT-MWI) <br /> 1,2-EDB 2.9 µg/l 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 0 018 The overall regional flaw direction of the 1 <br /> Igroundwater zone 1s towards the topographic low portion of the San Joaquin Delta area. <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 0 002(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 />' ]1Mw1D1EnvEroonuntallPmn IcxxolReportslQMR093005 wo 7 <br /> I <br />