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� T <br /> Second 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 21 micrograms per liter <br /> (gglL) 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 well MW-3 Concentrations of MTBE near the detection limit have been detected in the monitor <br /> wells on the west extent of the site The detections have appeared first in monitor well MW-4, followed <br /> by MW-1 and most recently MW-7 It is possible that the low concentrations of MTBE represent <br /> background concentrations since they are at the upgradient extent of t11e site <br /> Table 2—Groundwater Laboratory Analytical Results (April 9,2002) <br /> B T E X TPH-G Gasoline <br /> Oxygenates/Additives <br /> Analytical Method-> 8020 8020 8020 8020 8015m 8260 <br /> Reporting Limits— 05 05 05 1 0 005 05-1300 <br /> Sample I D pg/L ltg/L µg/l- pg/L mg/L pg/L <br /> 2038-MW1-4/9/02 <0 5 <0 5 <0 5 <1 0 <0 05 1 7(MTBE) <br /> 2038-MW2-419102 49 32 66 120 13 <5 0-130 <br /> 2038-MW3-4/9102 14 <0 5 <0 5 <1 0 0 099 12 (MTBE) <br /> 2038-MW4-419102 <0 5 <0 5 <0 5 <1 0 <0 05 3 4(MTBE) <br /> 2038-MW5-4/9/02 10,000 13,000 1,700 5,800 69 <50-1,300 <br /> 2038-MW6-4/9/02 <0 5 <0 5 <0 5 <1 0 <0 05 21 (MTBF) <br /> 2038-MW7-4/9/02 <0 5 <0 5 <0 5 <1 0 006 15(MTBE) <br /> Units Analytical <br /> mg/L,=milligrams per liter=parts per million(ppm) B,T,E,X=benzenc, toluene ethyl benzene,total xylenes <br /> pg/L—micrograms per liter=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(DIPS),ethyl tertiary butyl ether(LTBE), <br /> tertiary amyl methyl ether(TAME) <br /> FUTURE WORK <br /> The next quarterly groundwater monitoring event is scheduled for July 2002 Results of the recent soil <br /> and groundwater investigation will be presented in the Additional Soil and Groundwater Investigation <br /> Report, currently being prepared by Condor <br /> i <br /> ia CONDOR <br />