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�. Quarterly Monitoring Report,October,1998 Canepa's Car Wash(Park Street) + µ - November 18,1998 Page 2 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,F` water-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. A strong petroleum hydrocarbon odor was noted in the groundwater sample collected from MW- k 2, and a moderate odor was noted in the sample collected from MW-5. Petroleum hydrocarbon odors were not _. F noted in the remaining groundwater samples. All of the monitorwells were 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 55-gallon drums and left on site pending laboratory analytical results. 3.2 Groundwater Sampling Each well was allowed to recover to at least 80% of its pre-purge water level before sampling.7 The groundwater samples were collected directly from disposable bailers by transferring the groundwater to two 40- ml 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 coIlection.: , I 4. GROUNDWATER MONITORING RESULTS 4.1 Groundwater Elevation Contours On October 21, 1998, the depth to groundwater was measured in each monitor well prior to the collection of groundwater samples.' The average depth to groundwater was approximately 24.6 feet below the well measuring points (slightly below the ground surface). The average depth to groundwater increased _ approximately 0.4 feet since the previous monitoring event conducted in July, 1998. The groundwater elevation ranged from 12.65 to 14.40 feet below mean sea level (bmsl). .Tbe groundwater elevation contour map (Figure Fi re 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. CONDOR (