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FORTH QUARTER 1996 <br /> QUARTERLY MONITORING REPORT <br /> USA STATION#65- LODI <br /> NOVEMBER, 1996 <br /> USA retained Park to prepare a Remedial Action Plan (RAP) The rationale and design of the <br /> necessary environmental remediation and sampling activities at the site were presented in Park's <br /> RAP dated November, 1995 and in a subsequent letter to the County, dated February 28, 1996 <br /> 3.0 SCOPE OF WORK <br /> 1 Groundwater monitoring was completed at the site on October 10, 1996 The following is a brief <br /> summary of the scope of work authorized by USA <br /> • Locate and measure depths to groundwater and free product thicknesses in <br /> groundwater monitoring wells MW-1 through MW-8, S-1 and S-2, <br /> o Purge a minimum of three equivaIent well volumes of groundwater from each of <br /> the sampled wells, monitor pH, temperature and conductivity, <br /> Collect groundwater samples from the purged monitoring wells, <br /> • Analyze water samples for TPH G, methyl-tert-butyl-ether(MTBE) and BTEX, <br /> using EPA Methods 8015 Modified and 8020, respectively, and <br /> • Prepare this QMR for submittal to USA and the County, <br /> 4.0 GROUNDWATER MONITORING <br /> The following section discusses field protocol used during data collection for this QMR. <br /> 4.1 Groundwater Elevations <br /> Upon au gde the to �'oundwater, the groundwater monitoring wells were checked for the <br /> presence of free floating hydrocarbon using an interface probe Depths to groundwater <br /> measurements were then taken from each well from surveyed marks on the casing using an <br /> electric water level sensor or interface probe Calculated groundwater elevations are presented in <br /> Table 1 The field data sheets are included in Appendix A <br /> 3 <br />