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'I <br /> - Quarterly Monitoring Report, April 2000 <br /> Cmepa's Car Wash (Park Street) <br /> October 20, 2000 <br /> Page 3 <br /> TABLE 1 <br /> GROUNDWATER ELEVATION DATA (July 129 2000) <br /> MW-1 THROUGH MW-7 <br />'l Well Well Casing Well Collar Depth to Groundwater <br /> ID Screen Elevation Water Elevation <br /> Interval (feet) (feet) (feet) <br /> (feet - bgs) <br /> MW-1 45 - 65 10.97 21 .79 - 10. 82 <br /> MW-2 45 - 65 10.37 22. 52 - 12. 15 <br /> MW-3 45 - 65 11 .76 23 . 11 - 11 .35 <br /> MW-4 40 - 60 10. 85 21 .33 - 10.48 <br /> MW-5 40 - 60 11 .25 22. 81 - 11 .56 <br /> MW-6 40 - 60 11 .72 23 .00 - 11 .28 <br /> MW-7 0 - 60 11 .05 23 .07 - 12.02 <br /> 4.2 LABORATORY ANALYSES (TPH-G, BTEX, OXYGENATES/ADDITIVES) <br /> The groundwater samples were analyzed by GeoAnalytical Laboratories, Inc. for total petroleum hydrocarbons <br /> quantified as gasoline (TPH-G) by Method 5030/LUFT; for benzene, toluene, ethyl benzene, and total xylenes <br /> (BTEX) by EPA Method 802113; and for selected gasoline oxygenates/additives by EPA Method 8260B . The <br /> gasoline oxygenates/additives include methyl tertiary-butyl ether (MTBE), ethanol, tertiary-butanol, di- <br /> isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), and tertiary-amyl methyl ether (TAME). <br /> Laboratory analyses indicate that none of the analytes of interest were detected at or above the laboratory <br /> reporting limits in the groundwater sample collected from monitor well MW- 1 . In the groundwater samples <br /> from MW-4 and MW-6 MTBEwvas detected at a concentration of 1 .4 micrograms per liter (µg/L) an& 12 µg/L, <br /> respectively. Toluene was detected in the groundwater sample collected from monitor well MW-7 at a <br /> concentration of d).8 µg/L. Ethyl Benzene and MTBE were detected at concentrations of 0 .3 µg/L and 3 .2 µg/L, <br /> respectively, in the groundwater sample collected from MW-3 . BTEX and TPH-G were detected in the sample <br /> collected from monitor well MW-2 at concentrations of:.90 µg/L, 52 µg/L, 120 µg/L, _160 µg/L, an&6.9 <br /> milligrams per liter (mg/L), respectively. BTEX and TPH-G were detected in the groundwater sample collected <br /> from monitor well MW-5 at concentrations of 6,700 µg/L, 6, 100 µg/L, 1 ,000 µg/L, 25800 µg/L, and 24 mg/L, <br /> respectively. None of the selected gasoline oxygenates/additives were detected at or above the laboratory <br /> reporting limits in any of the groundwater samples, with the exception of MTBE, which was detected in the <br /> samples collected from MW-3, MW-4, and MW-6 . The laboratory reporting limits were raised, however, for the <br /> groundwater samples collected from MW-2 and MW-5 due to high concentrations of other analytes. A <br /> summary of the laboratory analytical results is presented in Table 2 on the next page, and in Figure 3 , Appendix <br /> A. Laboratory report sheets indicating analytical methods used, reporting limits, and the results of the analyses <br /> are included in Appendix C. Historical groundwater analytical data are presented in Table A, Appendix B. <br /> n• <br /> t , CONDOR <br />