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1 ' QUARTERLY MONITORING REPORT,April 1998 CANEPA S CAR WASH • 6234 Pacific Avenue,Stockton,CA May 26 1998 ' Page -2 Prior to granting unconditional approval of installation of a new SVE system., the Underground Storage Tank Reimbursement Fund has indicated the need for additional investigation Condor has completed the installation and sampling of two soil borings adjacent to the SVE well array The investigation included ' soil vapor screening using the Simulprobe sampling device in soil vapor collection mode Initial results indicated high levels of volatile organic compounds are present in the soil gas at the site The results of the laboratory analysis of soil and groundwater samples are pending A detailed Site History is included in Appendix B ' 3 0 QUARTERLY GROUNDWATER MONITORING -APRIL, 1998 On April 22 and 23, 1998, Condor personnel made field observations and collected groundwater ' samples from the eight monitor wells at the site (see Figure 2, Appendix A, for well locations) In addition, at the request of Mr Rowe of the PHS/EI-ID, a groundwater sample was also collected from soil vapor extraction well SV-2 The order of sampling was MW-5, MW-4, MW-8, MW-3, MW-1, SV-2, MW-2, MW-7, and MW-1 3.1 GROUNDWATER MONITORING OBSERVATIONS AND PARAMETERS ' The static water level in each well was measured to the nearest 0 01-foot with a battery-operated, flat tape, water-level meter A disposable bailer was lowered into each well to check for floating product, ' petroleum odors, and sheen Floating product was not observed in any of the monitor wells during the groundwater sampling Water levels in the wells were above the top of the well screens, however Strong petroleum hydrocarbon odors were noted in the groundwater samples collected from MW-2 and SV-2, and a moderate odor was detected in MW-1 No odor was noted in any of the other groundwater samples collected MW-I was purged using a Small submersible pump All other wells were each purged using new, disposable bailers At least 3 casing volumes of water were purged from each well (see the Groundwater Monitoring Field Forms in Appendix B) The purged water from each well was placed in a plastic, 55- gallon drum and left on site pending analytical results 3 2 GROUNDWATER SAMI'LING Each well was allowed to recover to at least 80% of its prc-purge water level before sampling The groundwater samples were collected directly from disposable bailers Each water sample consisted of three 40-nil glass, volatile organic analyses (VOA) vials The VOAs were labeled and placed in a cooler grour..Wa«r sa111pLUN wets cteiivCreu, under cinain-of-custody procedures, to GeoAnalytical Laboratories, Inc , in Modesto, California, on the day oI collection 4 0 GROUNDWATER MONITORING RESULTS 4 1 GROUNDWATER ELEVATION CONTOURS On April 22, 1998, the depth to groundwater was measured in each monitor well prior to the collection of gioundwatcr samples The average depth to groundwater was approximately 35 9 feet below the well measuring points (slightly below the ground surface) The average depth to groundwater has decrease ate® `y CONDOR