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1 <br /> 1 312 LaboratoKy Sample Analysis <br /> The water samples were analyzed using U S Environmental Protection Agency(U S EPA) Test <br /> 1 Method 8260B for benzene, toluene, ethylbenzene, xylene, TPH-gasohne, and 5 oxygenate <br /> compounds In addition, the lead scavenger compounds 1,2-Dichloroethane (1,2-DCA) and <br /> 1 1,2-Dibromoethane(1,2-DCB) were also analyzed Copies of the analytical laboratory reports <br /> (Kiff#47351) and chain of custody documentation are attached to this report(Appendix 3) and <br /> the results are tabulated in the attached Tables 3 and 4 <br /> 1 <br /> 3.3 Local Groundwater Gradient <br /> 1 The groundwater surface depths from the six monitoring wells were plotted and contoured <br /> showing lines of equal groundwater elevation surface The attached Figure 5 shows the <br /> 1 groundwater elevation contours that are present around these wells The estimated groundwater <br /> gradient from all of the wells is also depicted on the attached map <br /> 1 The wells all suggest a gentle slope of the groundwater surface to the southwest and away from <br /> the Mokelumne River at a gradient of approximately 0 002 or approximately 10 feet per mile <br /> 1 <br /> 1 � <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> • <br /> 1 Mam\D1Env�ronmentallPar�nai7 axacolRepor#s1QMR0123105 wN 5 <br /> 1 <br />