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1 <br />' FOURTH QUARTER,1997 <br /> GROUNDWATER MONITORING REPORT <br /> USA STATION#65-LODI <br />' NOVEMBER,1997 <br /> On October 6, and 7, 1997, USA removed and replaced the three existing UST's and product <br />' distribution plumbing USA also removed approximately 500 cubic yards of hydrocarbon <br /> impacted soil during the excavation and retrofit activities GHH representatives provided product <br /> line and UST excavation soil sampling services to USA during the retrofit activities, as directed by <br /> the County Soil sampling activities and analytical results are presented in the "Soil Excavation <br /> and Product Line Sampling" letter report to the County dated October 22, 1997 Monitoring well <br /> S-1 was damaged and repaired during the field activities <br />' 3.0p <br /> SCO E OF WORK <br /> The following is a brief summary of the scope of work performed by GHH during the <br /> groundwater monitoring commencing on October 6, 1997 <br /> r0 Locate and measure depths to groundwater in monitoring wells MW-1 through <br /> MW-8, S-1 and S-2 <br /> ta Purge a minimum of three equivalent well volumes of groundwater from each of <br /> the sampled wells, while monitoring pH, and conductivity <br /> r & Collect groundwater samples from the purged monitoring wells <br /> e Analyze water samples for TPH i1 the gasoline range (TPH G), BTEX and methyl- <br /> tert-butyl-ether (MTBE) using EPA Methods 8015 Modified and 8020, <br /> respectively <br />' 9 Prepare this QMR for submittal to USA and the County <br />' 4.0 GROUNDWATER MONITORING <br /> tThe following section discusses field protocol used during data collection for this QMR. <br />' 4.1 Groundwater Elevations <br /> Prior to gauging depths to groundwater, the groundwater monitoring wells were checked for the <br />' presence of free product using an interface probe Depths to groundwater measurements were <br /> then taken from each well from surveyed marks on the casing using an electric water level sensor <br /> Monitoring well S-1 was dry during this sampling event, it appears that during the excavation for <br /> removal of the USTs, 5-feet of soil entered the damaged well This soil will need to be taken out <br /> of the well, the well developed and restored to monitor groundwater quality Groundwater <br /> elevation data is summarized in Table 1 The field data sheets are included in Appendix X <br /> 3 <br />