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Canepa s Car Wash <br /> 248 East Park Street,Stockton,California <br /> First Quarter Groundwater Monitoring Report,January,2005 <br /> Page 2 of 5 <br /> • Summary of January 2005 Quarterly Groundwater Monitoring Results <br /> Field Activit <br /> Number of monitoring wells 7 Number of monitoring wells sam led 7 <br /> Date(s) monitored 1113 & 14105 <br /> Site Hydrology <br /> Average depth to groundwater below Average increase(+)/decrease(--) in <br /> monitoring well measuring points 28 52 feet depths to groundwater since last -0 56 foot <br /> sampling <br /> The lowest(deepest)groundwater <br /> Approximate groundwater flow direction North elevation has consistently been <br /> measured at monitoringwell MW-2 <br /> Groundwater Contamination <br /> Wells containing free product None Wells with petroleum hydrocarbon 3 <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 /> MCI., <br /> Range in concentrations <br /> Benzene(µg/L) <0 5—7,400 <br /> BTEX Toluene(pg/L.) <0 5—2,100 <br /> Nature of contamination MTBE Ethyl Benzene(ltg/L) <0 5—2,400 <br /> TPH-G Total Xylenes(pg/L) <1 0— 10,000 <br /> MTBE(pg/L) <1 0-3 5 <br /> TPH-G(mg/L) <0 05—34 <br /> • FIELD OBSERVATIONS <br /> All monitoring 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 /> moderate hydrocarbon odor was noted in well MW-2 and a slight hydrocarbon odor was noted to MW-5 <br /> and MW-6 <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 January 2005 <br /> monitoring event was 0 56 feet higher than measured in October 2004 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 /> f <br /> ow <br /> �� CONDOR <br />