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Canepa's Car Wash <br /> •�- 248 East Park Street,Stockton,California <br /> Third Quarter Groundwater Momtonng Report,July 2004 <br /> Page 2 of 5 <br /> Summary of July 2004 Quarterly Groundwater Monitoring Results <br /> Field Activit <br /> Number of monitor wells 7 Number of monitor wells sampled 7 <br /> Datc(s)monitored 07/14/04 <br /> Site Wdrology <br /> Average depth to groundwater below Average increase(+)/decrease H in <br /> monitor well measuring points 27 91 feet depths to groundwater since last sam lin +0 61 foot <br /> The lowest(deepest)groundwater <br /> Approximate groundwater flow direction Northeast elevation has consistently been measured <br /> at monitor 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 5 concentrations at or above the benzene 2 <br /> MCL <br /> Range in concentrations <br /> Benzene(pg/L) <0 5—9,200 <br /> 13TEX Toluene(µi / ) <0 5—1,900 <br /> Nature of contamination Ethyl benzene(pg/L) <0 5—1,900 <br /> TPH-G Total xylenes(µgfl <1 0—5,300 <br /> TPH-G(mg/L) <0 05—40 <br /> FIELD OBSERVATIONS y <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 No sheen or separate phase petroleum <br /> was noted in field inspection samples from the wells A slight sulfur odor was noted in the groundwater <br /> inspection sample from well MW-2, and a moderate hydrocarbon odor was noted in the groundwater <br /> inspection sample from well 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 meter The groundwater monitoring field forms and groundwater measurement field form are <br /> 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 July 2004 <br /> monitoring event was 0 61 foot lower than measured in May 2004 The groundwater elevation contours <br /> for the current monitoring event indicate a groundwater gradient generally toward the northeast, <br /> consistent with previously reported gradient information <br /> 4M <br /> �� CONDOR <br />