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Canepa's Car Wash <br /> 248 East Park Street,Stockton,California <br /> First Quarter Groundwater Morutonng Report,January 2003 <br /> Page 2 of 5 <br /> Summary of January 2003 Quarterly Groundwater Monitoring Results <br /> Field Active <br /> Number of monitor wells 7 Number of monitor wells sampled 7 <br /> Dates monitored 1/13/03 <br /> Site Hydrology <br /> Average depth to groundwater below 26 86 feet Average increase(+)/decrease(—) in depths 0 00 feet <br /> monitor well measuring points(bgs) bgs to oundwater since last sampling <br /> The lowest(deepest) groundwater elevation <br /> Approximate groundwater flow direction Northeast has consistently been measured at MoMtOr <br /> well MW-2 <br /> Groundwater Contamination <br /> Wells contatnuig free product None Wells with detected odors 3 <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—8,100 <br /> Toluene(µg/L) <0 5—6,600 <br /> Nature of contamination Ethyl-benzene(µg/L) <0 5— 1,700 <br /> Total xylenes(pg/L) <1 0—6,000 <br /> TPN-G TPH-G(mg/L) <0 05—55 <br /> MTBE MTBE(µg/L) <0 5—12 <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 Strong and moderate petroleum <br /> odors were noted in the groundwater inspection samples from wells MW-2 and MW-5, respectively A <br /> strong vanilla odor was noted in the groundwater inspection sample from well MW-3 <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 January <br /> 2003 monitoring event of 22 86 feet below ground surface (bgs) was the same as the previous quarter <br /> The groundwater elevation contours for the current monitoring event indicate a groundwater gradient <br /> generally toward the northeast, consistent with previously reported gradient information <br /> i <br /> �� CoNDOR <br />