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i <br /> i 44 <br /> I • Kiff Analytical Labs issued Report#42632 on March 10,2005,which 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 /> cmftmt Contrition Wen <br /> benzene 140µg/1 PT-MW I <br /> toluene 140 µg/l PT-MW1 <br /> ethylbenzene 180 µg/1 PT-MW1 <br /> xylene 380 µg/1 PT-MW1 <br /> TPH Gasoline 12,000 pg/1 PT MW3(4900 µg/1 for PT-MWi) <br /> MTBE 16 ILSA PT MW3 <br /> M Not Analyzed <br /> ET Not Analyzed <br /> TBA 17 µg/1 PT-MW1 <br /> DIPE <0 5 µ,g/1 <br /> I TAME <0 5 µg/1 <br /> 1,2-DCA 9 2 pg/1 PT-MW3(4 6µg/l for PT-MW 1, 13 gg/1 for PT- <br /> MW2) <br /> 1,2-EDB 4 3 µg/l PT-MW3 <br /> 4.3 Local Gronuft—akr GM&gt <br /> The groundwater surface for this portion of San Joaquin County flows southerly from the <br /> Mokelumne River to the site(Sart 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't <br /> groundwater zone is towards the topographic low portion of the San Joaquin Delta. <br /> I The local or onsite groundwater flow direction for this monttonng event is a slope toward South <br /> 20 degrees West with a gradient of 0 001 (Figure 5) This flow direchon 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 /> I4A Petroleum Wdmarbon G yin r Pln-e <br /> The areal or horizontal extent of the petroleum hydrocarbon groundwater plume at the site <br />' extended throughout the site All monitoring wells except PT-MW4 and PT-MWS had reportable <br /> concentrations of petroleum hydrocarbons Significant concentrations of TPH-gasoline and <br /> benzene were present in wells PT MWI, 3 and 6 at concentrations above maximum contaminant <br />' levels (MCLs) Minor concentrations of 1,2-DCA were reported to be present in monitoring <br /> wells PT-MWI, PT-MW2 and PT-MW3 Minor concentrations of 1,2-EDB were reported to be <br /> present in monitoring well PT-MW3 MT&E was reported to be present at very low <br /> concentrations in monitoring well PF MW3 <br /> Man`Dlv�vwnm�llYemm PeracdRapartslQMR033i05 wpd 7 <br /> 1 <br /> 1 <br />