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r QUARTERLY MONITORING REPORT USA STATION#65- LODI APRIL,1996 On February 8, 1993, monitoring well MW-8 was completed to a depth of approximately 60-feet ' bgs by WEGE The well is downgradient from the suspected source and approximately 8-feet southeast of the tank field This well has consistently contained TPH and BTEX compounds On March 14, 1995, WEGE completed a one-day vapor extraction treatability test The test was performed on monitoring wells MW-4, S-1, S-2, and MW-8 Test results are summarized in the WEGE report Results of Pilot Test for Vapor Extraction, dated April 17, 1995 This work confirmed ' the feasibility of using vapor extraction for site remediation 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 In continuation of the quarterly sampling and monitoring program, Park conducted groundwater ' monitoring activities at the site during the first quarter of 1996 This QMR presents the findings from that groundwater sampling event ' 3.0 SCOPE OF WORK The following is a brief summary of the scope of work authorized by USA • Locate and measure depths to groundwater and free product thicknesses in groundwater monitoring wells MW-1 through MW-8, S-1 and S-2 (Figure 2), • Purge a minimum of three equivalent well volumes of groundwater from each of the sampled wells, monitor pH, temperature and conductivity, • Collect groundwater samples from the monitoring wells, • Analyze water samples for TPH G and BTEX, using EPA Methods 8015 Modified rand 8020, respectively, and • Prepare this QMR for submittal to USA and the County r 4.0 GROUNDWATER MONITORING rThe following section discusses field protocol used during data collection for this QMR r • r 3 r