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Monitaring Well Irtatatlawn Workplan <br /> � 707 East Yosemite Avenue Manteca Calitomia <br /> . 3.3 Groundwater Conddions <br /> Siegfried & Associates Engineering, of Stockton, California surveyed the locations and <br /> top-of-well casing elevations to an arbitrary site benchmark Aegis personnel collected <br /> depth-to-water measurements on August 17, 1993 Table 2 summarizes depth-to-water <br /> measurements and corresponding groundwater elevations All of the measurements were <br /> conducted according to the Aegis SOP On the basis of the August 17, 1993, <br /> measurements, groundwater is estimated to flow to the northeast(Figure 4) at an average <br /> gradient of 0 002 ft/ft <br /> 3.4 Ana 'cal Results: Groundwater <br /> On August 17, '1993, the wells were purged and groundwater samples collected according <br /> to the Aegis SOP The samples were submitted under chain-of-custody to Excelchem <br /> All samples were analyzed for concentrations of <br /> • TPH as gasoline and diesel, by EPA Method 8015, <br /> • BTEX by EPA Method 60218020, <br /> • Total lead <br /> . The groundwater sample analytical results are summarized in Table 3 No petroleum <br /> hydrearbons were detected in the groundwater samples Lead was detected at a <br /> concentration of 0 13 ppm in MW-2 This level is below the hazardous-waste designation <br /> of 5 0 ppm Figure 3 is a distribution map of TPH, as gasoline, diesel and benzene in <br /> groundwater based on the analytical results The laboratory report and chain-of-custody <br /> form are included in Appendix B <br /> • <br /> 93.0426 WPN 4 <br />