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tl !i <br /> Canepa's Car Wash <br /> 248 East Park Street,Stockton,California <br /> Fourth Quarter Groundwater Monitoring Report,November 2003 <br /> Page 2 of <br /> s <br /> Summary of November 2003 Quarterly Groundwater Monitoring Results <br /> Field Activity <br /> Number of monitor wells 7 Number of monitor wells sampled 7 <br /> Dates monitored 11/6/03 <br /> Site Hydrology <br /> Average depth to groundwater below 28 27 feet Average increase (f)/decrease(—) in depths +1 29 feet <br /> monitor well measuring points to roundwater since last sampling <br /> The lowest(deepest)groundwater elevation <br /> Approximate groundwater flow direction Northeast has consistently been measured at monitor <br /> well MW-2 <br /> Groundwater Contamination <br /> Wells containing free product None Wells with petroleum hydrocarbon odor 2 <br /> noted <br /> Number of wells with benzene Number of wells with benzene <br /> concentrations below the benzene MCL 1 concentrations above the benzene MCL 2 <br /> Range in concentrations <br /> Benzene(ltg/L) <0 5—8,300 <br /> BTEX Toluene(µg/L) <0 5—3,600 <br /> Nature of contamination Ethyl benzene(µg/L) <0 5— 1,800 <br /> TPH-G Total xylenes(pg/L) <1 0—5,300 <br /> TPH-G(mg/L) <0 05—50 <br /> FIELD OBSERVATIONS <br /> All monitor wells were purged using a clean, single-use, polypropylene, disposable bailer Approximately <br /> three well casing volumes of water were purged from each well The purged water from each well was <br /> placed in 55-gallon drums and left on site pending laboratory analytical results No sheen or separate <br /> phase petroleum was noted in field inspection samples from the wells Moderate and strong petroleum <br /> odors were noted in the groundwater inspection samples from wells MW-2 and MW-5, respectively <br /> GROUNDWATER ELEVATIONS AND GRADIENT <br /> The static water level in each well was measured to the nearest 0 01-foot with a battery-operated, flat <br /> tape, water-level meter The groundwater monitoring field forms and groundwater measurement field <br /> forth are included in Attachment C The groundwater table has been above the top of all well screens <br /> since the August 1996 monitoring event The average groundwater elevation measured during the <br /> November 2003 monitoring event was 1 29 feet lower than measured in July 2003 The groundwater <br /> elevation contours for the current monitoring event indicate a groundwater gradient generally toward the <br /> northeast, consistent with previously reported gradient information <br /> �" CONDOR <br />