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i1 Canepa's Car Wash <br /> 248 East Park Street,Stockton,California <br /> Second Quarter Groundwater Monitoring Report,April 2006 <br /> Page 4 of 5 <br /> Table 2—Groundwater Laboratory Analytical Results (April 28, 2006) <br /> B T E X MTBE Other Oxygenates/ TPH-G <br /> Additives <br /> Analytical Method—), $2608 8260B 82608 8260E 826013 <br /> 8260E 8015M <br /> Reporting Units µg/L µg/L n/L µg/L ug/L n/L m.g/L <br /> Sample I D <br /> MW-1 <0 5 <0 5 <0 5 <1 0 <0 5 <0 5-<5 0 <0 05 <br /> MW-2 88 10 28 59 <1 0 <1 0-<10 41 <br /> MW-3 <0 5 <0 5 <0 5 <1 0 <0 5 <0 5-<5 0 <0 05 <br /> MW-4 <0 5 <0 5 <0 5 <1 0 <0 5 <0 5-<5 0 <0 05 <br /> MW-5 6,900 1,700 2,100 6,400 <50 70(1,2-DCA) 42 <br /> MW-6 <0 5 <0 5 <0 5 <1 0 14 <0 5-<5 0 <0 05 <br /> MW-7 <0 5 <0 5 <0 5 <1 0 <0 5 <0 5-<5 0 <0 05 <br /> Units <br /> lig/L=micrograms per liter=parts per billion(ppb) <br /> mg/I,=milligrams per Inter=parts per nuilton(Ppm) <br /> Constituent levels in bold indicate concentration levels above laboratory reportable limits <br /> Analytical <br /> B,T,E X=benzene toluene,ethyl benzene total xylenes <br /> MTBE=Methyl tertiary-butyl ether <br /> TPH-G=total petroleum hydrocarbons quantified as gasoline <br /> Other oxygenates/additives = tertiary-butanol (TBA), di-isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE), tertiary-amyl methyl ether <br /> (TAME),1,24bohloroethane(1,2-DCA),and 1,2-dibromoethane(EDB) <br /> FUTURE WORK <br /> The next quarterly groundwater monitonng event is scheduled for July 2006 In the Additional Soil and <br /> Groundwater Investigation Report and Work Plan Addendum, dated July 12, 2004, Condor recommended <br /> and described the installation of five multi-screened, discreet depth monitor wells at the Site to further <br /> investigate the lateral and vertical extent of groundwater contamination Installation of the wells is <br /> pending the approval of the work plan addendum by the SJCEHD <br /> LIMITATIONS AND SIGNATURES <br /> This report was prepared under the direct supervision of a Certified Hydrogeologist in the State of <br /> California The standard of care for all services performed or furnished by Condor is commensurate with <br /> the care and skill ordinanly used by members of the environmental profession practicing under similar <br /> conditions at the same time in the same locality Condor is not responsible for the accuracy and <br /> completeness of information collected and developed by others <br /> 44,• <br /> ®s <br /> +.4d CONDOR <br />