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r SECOND QUARTER 1996 i QUARTERLY MONITORING REPORT USA PETROLEUM STATION #65 - LODI MAY, 1996 ' USA retained Park to prepare a Remedial Action Plan (RAP) The rationale and design of the necessary environmental remediation and sampling activities at the site were presented in Park's RAP dated November, 1995 and in a subsequent letter to the County, dated February 28, 1996 r 3.0 SCOPE OF WORK rThe following is a beef summary of the scope of work authorized by USA ' o Locate and measure depths to groundwater and free product thicknesses in groundwater monitoring wells MW-1 through MW-8, S-1 and S-2, o Purge a minimum of three equivalent well volumes of groundwater from each of the sampled wells, monitor pH, temperature and conductivity, ' 0 Collect groundwater samples from the monitoring wells, o Analyze water samples for TPH G and BTEX, using EPA Methods 8015 Modified and 8020, respectively, and ® Prepare this QMR for submittal to USA and the County 4.0 GROUNDWATER MONITORING 1 The following section discusses field protocol used during data collection for this QMR r4.1 Groundwater Elevations ' Upon gauging depths to groundwater, the groundwater monitoring wells were checked for the presence of free floating hydrocarbon using an interface probe Depths to groundwater measurements were then taken from each well from surveyed marks on the casing using an ' electric water level sensor or interface probe Calculated groundwater elevations and field data are presented in Tables 1 and 2, respectively The field data sheets are included in Appendix A 4.2 Monitoring Well Purging The monitoring wells were purged using a 2-inch diameter submersible Grundfos groundwater ' pump until a minimum of three equivalent well volumes of water were removed from each well Groundwater purged from the wells was placed into DOT approved 55-gallon drums and stored ' on-site prior to disposal by USA 3 r