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Quarterly Monitoring Report January, 1999 • Canepa s Car Wash(Part.Street) February 8 1999 Page 2 3 1 Groundwater Monitoring Observations and Parameters The static water level um each well was measured to the nearest 0 0]-foot with a battery-operated, flat tape, Iwater-level meter A clean, single-use, polypropylene, 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 It should be noted that the groundwater table was above the top of the well screens Moderate petroleum hydrocarbon odors were detected in the groundwater samples collected from MW-2 and MW-5 Petroleum hydrocarbon odors were not noted in the remaining groundwater samples All of the monitor wells were purged using new, disposable bailers 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 55-gallon drums and left on site pending laboratory analytical ' results 3 2 Groundvwater 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- milliliter glass vials The sample containers were labeled, placed in a cooler chilled with ice, and delivered in accordance with chain-of-custody procedures to GeoAnalytical Laboratories, Inc , in Modesto, California, on the day of collection 4 GROUNDWATER MONITORING RESULTS 4 1 Groundwater Elevation Contours On January 20, 1999, the depth to groundwater was measured in each monitor well prior to the collection of I groundwater samples The average depth to groundwater was approximately 24 1 feet below the well measuring points (slightly below the ground surface) The average depth to groundwater decreased approximately one half-foot since the previous monitoring event conducted in October, 1998 The groundwater I elevation fanged from 12 20 to 13 88 feet below mean sea level (bmsl) The groundwater elevation contour map (Figui e 3, Appendix A) indicates a groundwater gradient generally toward the northeast See Table 1, on the following page, for groundwater elevation data A hydrograph of groundwater elevations is included as Figure 4, Appendix A I I n I �� CONDOR