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' Quarterly Monitoring Report,lanuary 1998 C.—pa%Car Wash 248E Part.St Stockton CA March 12 199898 Pare ' Methyl tertiary Butyl Ether(MTBE) and gasoline oxygenates/additives were analyzed by EPA Method 8260 The laboratory certificates of analyses and chain-of-custody are located in Appendix C ' 4 2 Results of Analyses Laboratory analytical results indicated that TPH-G was detected in the groundwater samples collected from ' MW-1 at 0 11 mg/L, MW-2 at 16 mg/L, MW-3 at 0 53 mg/L, MW-5 at 9 0 mg/L, MW-6 at 0 18 mg/L, and MW-7 at 0 21 mg/L BTEX constituents were detected in the groundwater samples collected from all of the monitor wells sampled, ranging from 0 5 1tg/L to 2,000 ug/L Gasoline oxygenates/additives were not detected at or above the laboratory reported detection limits in any of the groundwater samples collected from the monitor wells with the exception of MTBE, at 1I µg/L, in the sample from MW-6 Detection limits were raised for MTBE and the other gasoline oxygenates/additives in MW-2 and MW-5 due to the presence of elevated gasoline concentrations The laboratory results are presented in Table 1, below, and Figure 2, Appendix A TABLE 1 ' Groundwater Analytical Results (January, 1998) MW-1 through MW-7 ' B T E X MTBE Other TPH-G Oxygenates/ Additives �. MONITOR Detection 0 3 03 03 06 1 0 See 005 WELL/ DATE Limits—+ µg/1 µgll "g/l µg11 µg/l Laboratory mg/1 SAMPLE Sample I D Report Sheet MW-1 1/22198 2038-MW1-1/22198 05 19 ND ND ND ND Oil MW-2 1/22/98 2038-MW2-1122/98 850 220 480 740 ND* ND* 16 MW-3 1/22/98 2038-MW3-1122/98 12 48 13 26 ND ND 053 MW-4 1/22/98 Not Sampled NS NS NS NS NS NS NS MW-5 1/22/98 2038-MW5-1/22/98 2,000 570 300 260 ND* ND* 90 MW-6 1/22/98 2038-MW6-1/22/98 14 11 68 78 11 ND 018 MW-7 1/22/98 2038-MW7-112/98 08 30 ND ND ND ND 0 21 Unit Conversions AnaMical pg/l parts per billion(ppb) B,T E X=benzc,ne,toluene ethyl benzene,and xylene mg/1 parts per million(ppm) rPH-G=total petroleum hydrocarbons quantified as gasoline MTBE=Methyl tertiary Butyl Ether I Other Oxygenates/Additives=ethanol,Di-isopropyl ether,Ethyl tertiary-Butyl Ether, terttary-amyl Methyl Ether and tertiary-Butanol ND=none detected at or above reported laboratory detection limit NS=Not Sampled-No access *=detection limit raised due to elevated concentrations See Certificalcs of Analytics for raised detection limn values N&—o I �� CONDOR