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Quarterly Monitoring Report,Apn]2001 Canepa's Car Wash(Park Street) May 28,2001 Page 2 3.1 GROUNDWATER MONTTORING 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 clean, single-use, polypropylene, disposable bailer was lowered into each well to check for floating product, petroleum odors, and sheen 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 inspection sample collected from MW-5 A moderate odor was noted in the groundwater inspection sample collected from MW-2, and a slight petroleum hydrocarbon odor was noted in the inspection sample from MW-3 None of the other groundwater inspection samples were noted as having an odor All monitor wells were purged using a Grundfos Reda-Flo II submersible pump, which was decontaminated prior to use 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 GROUNDWATER SAMPLING The groundwater samples from the monitor wells were collected by filling three 40-milliliter glass vials with groundwater directly from the pump discharge tubing at a reduced rate 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 for analyses 4. GROUNDWATER MONITORING RESULTS I4 1 GROUNDWATER ELEVATION CONTOURS On April 12, 2001, the depth to groundwater was measured in each monitor well prior to the collection of groundwater samples The average depth to groundwater on April 12, 2001, was approximately 23 4 feet below the well measuring points The average depth to groundwater decreased approximately 0 6 feet since the previous monitoring event conducted in January 2001 The groundwater elevation ranged from I 1153 to 13 25 feet below mean sea level (bmsl) The groundwater elevation contour map (Figure 2, Appendix A) indicates a groundwater gradient generally toward the northeast Groundwater elevation data is presented in Table 1, on the next page A hydrograph of groundwater elevations is included as Figure 3, Appendix A Note from the hydrograph in Figure 3 and a comparison of the top of the well casing screen interval versus the depth to water in Table 1 that the water table is approximately 16 to 22 feet above the top of the screen in all of the wells Ile IL� CONDOR