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Canepa s Car Wash 248 East Park Street,Stockton,California Fourth Quarter Groundwater Monitoring Report,October 2004 Page 4 of 5 Table 2—Groundwater Laboratory Analytical Results (October 2004) B T E X TPH-G MTBE Analytical Method—+ 8260B 8260B 8260B 8260B 8015B 82606 Reporting Units—> Ag/L Ag/L Ag/L n/L mg/L pg/L Sample I D 2038-MW1-10/12/04 <0 5 <0 5 <0 5 <1 0 <0 05 08 2038-MW2-10/12/04 19 19 52 100 63 <10 2038-MW3-10/12/04 <0 5 <0 5 <0 5 <1 0 <0 05 22 2038-MW4-10/12104 <0 5 <0 5 <0 5 <1 0 <0 05 1 1 2038-MW5-10/12/04 7,600 950 1,400 3,700 25 <40 2038-M W6-1 0/1 2104 <0 5 <0 5 <0 5 <1 0 <0 05 51 2038-MW7-10/12104 <0 5 <0 5 <0 5 <1 0 <0 05 1 0 Units. Analytical gg/L=micrograms per liter=parts per billion(ppb) B,T,E,X=benzene,toluene,ethyl benzene,total xylenes mg/L=milligrams per liter=parts per million(ppm) TPH-G=total petroleum hydrocarbons quantified as gasoline MTBE=Methyl tertiary-butyl ether FUTURE WORK The next quarterly groundwater monitoring event is scheduled for January 2005 In the Additional Soil and Groundwater Investigation Report and Work Plan Addendum, dated July 12, 2004, Condor recommended and described the installation of five multi-screened, discreet depth monitor wells at the site to further investigate the lateral and vertical extent of groundwater contamination Installation of the wells is pending the approval of the work plan addendum by the SJCEHD LIMITATIONS AND SIGNATURES This report was prepared under the direct supervision of a Registered Geologist in the State of California The standard of care for all services performed or furnished by Condor is commensurate with the care and skill ordinarily used by members of the environmental profession practicing under similar conditions at the same time in the same locality Condor is not responsible for the accuracy and completeness of information collected and developed by others • �� CONDOR