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Canepa's Car Wash <br /> 248 East Park Street,Stockton,California <br /> Second Quarter Groundwater Monitoring Report,Apnl 2003 <br /> Page 2 of 5 <br /> • Summary of April 2003 Quarterly Groundwater Monitoring Results <br /> Field Activi <br /> Number of monitor wells 7 Number of monitor wells sampled 7 <br /> Date(s)monitored 4104103 <br /> Site Hydrology <br /> Average depth to groundwater below 26 61 feet Average increase (+)/decrease(--) in depths _0 25 feet <br /> monitor well measuring points(bgs) bgs to groundwater 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 containfree product None Wells with detected odors 2 <br /> Number of wells with benzene Number of wells with benzene <br /> concentrations below the benzene MCL 5 concentrations at or above benzene MCL 2 <br /> Range in concentrations <br /> BTEX Benzene(pg/L) <0 5—7,000 <br /> Toluene(pg/L) <0 5—5,000 <br /> Nature of contamination Ethyl-benzene(pg/L) <0 5—1,500 <br /> Total xylenes(pg/L) <1 0—4,800 <br /> TPH-G TPH-G(mg/L) <0 05—43 <br /> MTBE MTBE ) <5 0—13 <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 strong petroleum odors <br /> 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 April <br /> 2003 monitoring event of 26 61 feet below ground surface (bgs) is slightly higher that the previous <br /> quarter The groundwater elevation contours for the current monitoring event indicate a groundwater <br /> gradient generally toward the northeast, consistent with previously reported gradient information <br /> • <br /> %0 CONDOR <br />