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First Quarter 2002 Quarterly Groundwater Monitoring Report <br /> Canepa s Car Wash,Park Street,Stockton,CA <br /> Page 3 <br /> Concentrations of MTBE in monitor well MW-6 have ranged from < 0 5 to 19 rrucrograms per liter <br /> (pg/ ) over time, with a trend of increasing concentration since April 2001 (Figure 8, Attachment A) <br /> Low concentrations of MTBE have been sporadically present in groundwater samples collected from <br /> monitor wells MW-3 and MW-4 <br /> Table 2— Groundwater Laboratory Analytical Results (January 8, 2002) <br /> B T E X TPH-G Gasoline <br /> Ox enates/Additives <br /> Analytical Methods 8020 8020 8020 8020 8015m 8260 <br /> Reporting Urnits-a 05 05 05 10 005 05-1300 <br /> Sample LD µg/L 4g/L µg/L ltg/L mg/L µg/L, <br /> 2038-MW1-118102 <0 5 <0 5 <0 5 <1 0 <0 05 14(MTBE) <br /> 2038-MW2-1/8/02 120 30 51 55 87 <5 0-130 <br /> 2038-MW3-1/8/02 13 <0 5 <0 5 <1 0 1 013 9 9(MTBE) <br /> 2038-MW4-118/02 <0 5 <0 5 <0 5 <1 0 <0 05 2 5(MTBE) <br /> 2038-MW5-118102 9,500 7,900 1,700 4,500 59 <50-1,300 <br /> 2038-MW6-1/8/02 <0 5 <0 5 <0 5 <1 0 <0 05 18(MTBE) <br /> 2038-MW7-1/8/02 <0 5 <0 5 <0 5 <1 0 <0 05 14(MTBE) <br /> Units Analytical <br /> mg/L=milligrams per liter=parts per million(ppm) B,T,E,X=benzene,toluene,ethyl benzene,total xylenes <br /> µg/L=micrograms per Mer=parts per billion(ppb) TPH-G=total petroleum hydrocarbons quantified as gasoline <br /> • Gasoline oxygenates/additives=methyl tertiary butyl ether(MTBE),ethanol, <br /> tertiary butanol,di-isopropyl ether(D1PE), ethyl tertiary butyl ether(E ME), <br /> tertiary amyl methyl ether(TAME) <br /> FUTURE WORK <br /> Additional groundwater investigation field activities are scheduled for the last week in March 2002 The <br /> next quarterly groundwater momtonng event is scheduled for April 2002 <br /> i a CONDOR <br />