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Canepa's Car Wash <br /> 248 East Park Street,Stockton,California <br /> Tbird Quarter Groundwater Momtonng Report,July 2003 <br /> Page 2 of 5 <br /> • Summary of July 2003 Quarterly Groundwater Monitoring Reiult3 <br /> Field Activity <br /> Number of monitor wells 7 Number of monitor wells sampled 7 <br /> Date(s)monitored 7/10103 <br /> Site Hydrology <br /> Average depth to groundwater below 26 98 feet Average increase(+)/decrease (—)m depths <br /> monitor well measuring points (bgs) bgs to groundwater since last sampling +0 37 feet <br /> The lowest(deepest)groundwater elevation <br /> Approximate groundwater flow direction Northeast has consistently been measured at mointor <br /> well MW-2 <br /> Groundwater Contamination <br /> Wells containing free product None Wells with detected odors 2 <br /> Number of wells with benzene 5 Number of wells with benzene 2 <br /> concentrations below the benzene MCL concentrations at the benzene MCL <br /> Range in concentrations <br /> Benzene(µg/L) <0 5—6,200 <br /> BTEX Toluene(µg/L) <0 5—5,600 <br /> Nature of contamination Ethyl benzene(µgtL) <0 5 1,300 <br /> Total xylenes(µg/L) <l 0-4,500 <br /> TPH-G TPH-G(mg/L) <0 05—49 <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 Slight and moderate 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 /> form 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 July <br /> 2003 monitoring event was 0 37 feet lower than measured in April 2003 The groundwater elevation <br /> contours for the current monitoring event indicate a groundwater gradient generally toward the northeast, <br /> consistent with previously reported gradient information <br /> �`� CONDOR <br />