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Canepa s Car Wash 248 East Park Street,Stockton,California Second Quarter Groundwater Monitoring Report,April 2005 Page 4 of 5 • A summary of the laboratory analytical results for the current monitoring event is presented In Table 2, on the following page Laboratory report sheets indicating analytical methods used, reporting limits, and the results of the analyses are included in Attachment D Table 2—Groundwater Laboratory Analytical Results (April 12, 2005) Other B T E X TPH-G MTBE Oxygenates/ Additives Analytical Method—+ 8260B 8260B 8260E 8260B 8015M 8260E 82608 Reporting Units-+ µg/L µg/L. µg/L, µg/L mg/L gg/L n/L Sample I D 2038-MW I A/12/05 <0 5 <0 5 <0 5 <1 0 <0 05 10 <0 5 -<5 0 2038-MW24/12/05* 16 16 30 62 46 <5 0 <5 0-<50 2038-MW3-4/12/05 <0 5 <0 5 <0 5 <1 0 <0 05 21 <0 5-<5 0 2038-MW4-4/12/05 <0 5 <0 5 <0 5 <1 0 <0 05 12 0 7(1,2-DCA) 2038-MW5-4/12/05* 10,000 4,400 2,200 6,700 45 <50 140(1,2-DCA) 2038-MW6-4/12/05 <0 5 <0 5 <0 5 <1 0 <0 05 51 <0 5-<5 0 2038-MW7-4/12/05 <0 5 <0 5 <0 5 <1 0 <0 05 1 5 <0 5-<5 0 • Units µg/L=micrograms per liter=parts per billion(ppb) mg/L=milligrams per liter=parts per million(ppm) Constituent levels in bold indicate concentration levels above laboratory reportable limits Analytical B,T,E,X=benzene,toluene,ethyl benzene,total xylenes MTBE=Methyl tertiary-butyl ether TPH-G=total petroleum hydrocarbons quantified as gasoline *=Sample diluted due to high concentration of target analytes and/or high organic content Other oxygenatesladditives = ternary butanol (TBA), di-isopropyl ether(D1PE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), 1,2-dichloroethane(1 2-DCA),and 1,2-dibromoethane(EDB) FUTURE WORK The next quarterly groundwater monitoring event is scheduled for July 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 Professional 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 tho same time in the same locality Condor is not responsible for the accuracy and completeness of information collected and developed by others • A �•1� CONDOR