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' 3—.2 Laboratory Sample Analysis <br /> The water samples were analyzed using U S Environmental Protection Agency(U S. EPA)Test <br />' Method 8260B for benzene, toluene, ethylbenzene, xylene, TPH-gasoline, and 5 oxygenate <br /> compounds In addition, the lead scavenger compounds 1,2- D€chloroethane (1,2-DCA) and <br /> 1,2-D€bromoethane(1,2-DCB)were also analyzed Copies of the analytical laboratory reports <br />' (K€ff#44265) and chain of custody documentation are attached to this report (Appendix 3)and <br /> the results tabulated in the attached Tables 3 and 4 <br /> 3.3 Local Groundwater Gradient <br /> The groundwater surface depths from the six monitoring wells were plotted and contoured <br /> showing Imes of equal groundwater elevation surface The attached Figure 5 shows the <br /> 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 /> The wells all suggest a gentle slope of the groundwater surface to the southwest and toward the <br />' Sacramento River at a gradient of approximately 0 001, approximately 5 feet per mile This <br /> gradient and direction of flow are consistent with previous groundwater gradients present at sites <br /> near the Sacramento River within the city of Rio Vista and is consistent with the pnor <br /> Igroundwater monitoring data on site <br /> r . <br /> MamUT-nvwm=ntallP==Tcx m\PAp M\QMR063005 5 <br /> • <br />