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1 Page 3 ' Ms Margaret Lagono February 21, 1997 ' MONITORING ACTIVITIES ' Groundwater sampling for this quarterly monitoring event was performed between December 16 and 18, 1996 Depth to groundwater and the presence or absence of phase separated hydrocarbons (PSH) was evaluated in each monitoring well Groundwater ' sampling procedures are presented in Appendix A Water sample field data sheets are presented in Appendix B Groundwater samples were submitted under proper chain of custody control to Western ' Environmental Science & Technology of Davis, California Samples were analyzed in accordance with United States Environmental Protection Agency (USEPA) guidelines for total volatile hydrocarbons-gasoline (TVH-G), and benzene, toluene, ethylbenzene, and ' total xylenes (BTEX) compounds using USEPA Methods Modified 8015 and 602, respectively Groundwater samples were also collected and analyzed for various parameters to indicate ' the occurrence of natural intrinsic biodegradation Groundwater sample collection and analytical procedures followed those described in Protocol for Monitoring Intrinsic Bioremediation to Groundwater (included in Appendix A), which was provided to Philip by the Santa Clara Valley Water Quality District LUST Oversight Program for a similar project within their jurisdiction These parameters include alkalinity, dissolved oxygen, oxidation-reduction(redox)potential, pH, specific conductivity, temperature, nitrate, ' sulfate, and ferrous iron QUARTERLY MONITORING RESULTS ' Groundwater elevationetrol p earn hydrocarbon analytical, and biodegradation assessment data are contained in the following sections ' Groundwater Elevations Data - ' Groundwater elevation measurements for this quarter are presented in Table 1 Historical groundwater elevation measurements are in Table 2 Groundwater elevations measured in facility monitoring wells on December 16, 1996, ranged from-30 04 to -3105 feet MSL ' Groundwater levels in all but three wells increased approximately 0 75 to 0 97 feet from the previous monitoring event, while groundwater levels in MW-1, MW-7, and MW-10 decreased 0 08 to 0 23 feet As shown in Figure 3, Potentiometric Groundwater ' Elevatiol Contour Map, the groundwater flow direction is easterly at a gradient of about 2 6 x 10" foot per foot This groundwater flow direction vanes somewhat from the radial pattern delineated in the third quarter 1996 monitoring event, but is generally consistent with historic water level data 1 E 121382112599714gtr96 doc