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Quarterly Monitoring Report, January 1999 Canepa s Car Wash(Pacific Avenue) February 8, 1999 ' Page -2 Prior to granting approval of installation of a new SVF system, the Underground Storage Tank Clean-Up Fund indicated the need for additional investigation Subsequently, Condor conducted the installation and I sampling of two soil borings adjacent to the SVE well array The investigation included soil vapor scicening using a Simulprobe sampling device in soil vapor collection mode The results indicated high levels of volatile organic compounds are present in the soil vapor at the site The laboratory analytical results of the soil and groundwater samples collected during the investigation are presented in Report—Sod crud Groundwater Investigation, dated Junc. 12, 1998 A detailed Site History is included in Appendtx B r3 0 QUARTERLY GROUNDWATER MONITORING -JANUARY 1999 On January 21 and 22, 1999, a Condor representative performed field observations and collected I groundwater samples from the eight monitor wells at the site (see Figure 2, Appendix A, for well locations) The sampling order was as follows MW-5, MW-4, MW-8, MW-G, MW-1, MW-2, MW-7, and MW-3 3 1 GROUNDWATER MONITORING OBSERVATIONS AND PARAMETERS IThe static water level in each well was measured to the nearest 0 01-foot with a battery-operated, flat tape, water-level meter A clean, single-use, polypropylene, disposable baiter 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 It should be noted that the surface of the groundwater table was above the top of the well screens A moderate and slight petroleum hydrocarbon odor was noted in the groundwater sample collected from MW-I and MW-2, respectively Petroleum hydrocarbon odors were not rioted in the remaining groundwater samples All of the monitor wells except MW-1 and MW-3 were purged using new, disposable bailers Monitor I wells MW-1 and MW-3 were purged with an electric submersible pump Approximately three well 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 I3.2 GROUNDWATER SAMPLING Each well was allowed to recover to at least 80% of its pre-purge water level before sampling The groundwater samples were collected directly from disposable bailers by transferring the groundwater to two 40-inl glass vials 111G Jd11-1ple l.Ulltalllels were labeled, plaLVU lir a ioVier Cinliied �vltln It,;,, and delivered, in accordance with chain-of-custody procedures, to GeoAnalytical Laboratories, Inc , ul IModesto, Californta, on the day of collection 4 0 GROUNDWATER MONITORING RESULTS 41 GROUNDWATER ELEVATION CONTOURS On lanuary 21, 1999,the depth to groundwater was measured in each monitor well prior to the collection Of groundwater samples The average depth to groundwater was approximately 34 2 feet below t ell Measuring points (slightly below the ground surface) The average depth to groundwater dee IQd� CONDOR