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77 <br /> Canepa s Car Wash <br /> 248 East Park Street,Stockton,California <br /> Second Quarter Groundwater Momtonng Report,April 2005 <br /> Page 2 of 5 <br /> . Summary of April 2005 Quarterly Groundwater Monitoring Results <br /> Field Activit <br /> Number of monitoring wells 7 Number of monitoring wells sampled 7 <br /> Dates monitored 4/12/05 <br /> Site H drola <br /> Average increase(f)/decrease(—) in <br /> Average depth to groundwater below 27 10 feet depths to groundwater since last -142 feet <br /> monitoring well measuring points sampling <br /> The lowest(deepest)groundwater <br /> Approximate groundwater flow direction North elevation has consistently been <br /> measured at monitorin well MW-2 <br /> Groundwater Contamination <br /> Wells containing free product None Wells with petroleum hydrocarbon 2 <br /> odor noted <br /> Number of wells with benzene Number of wells with benzene <br /> concentrations below the benzene MCL 5 concentrations at or above the benzene 2 <br /> MCL <br /> Range in concentrations <br /> BTEX Benzene(µg(L.) <0 5— 10,000 <br /> MTBE Toluene(pg/L) <0 5--4,400 <br /> Nature of contamination TPH-G Ethyl Benzene(µg/L) <0 5—2,200 <br /> 1,2-DCA Total Xylenes(µg/L) <1 0-6,700 <br /> MTBE(µg/L) <1 0-5 1 <br /> TPH-G(mg/L) <0 05—45 <br /> 1,2-DCA(µg/L) <0 5-- 140 <br /> • FIELD OBSERVATIONS <br /> All monitonng wells were purged using a clean, single-use, polypropylene, disposable bailer <br /> Approximately three well casing volumes of water were purged from each well No sheen or separate <br /> phase petroleum was noted in the initial groundwater field inspection samples from the wells, however, a <br /> strong hydrocarbon odor was noted in monitoring wells MW-2 and MW-5 <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 tape, <br /> water level indicator The groundwater monitoring field forms and groundwater measurement field form <br /> are included in Attachment C The groundwater table has been above the top of all well screens since the <br /> August 1996 monitoring event The average groundwater elevation measured during the April 2005 <br /> monitonng event was 142 feet higher than measured in January 2005 The groundwater elevation <br /> contours for the current monitoring event indicate a groundwater gradient variable across the Site, but <br /> generally toward the north <br /> • <br /> �1� CONDOR <br />