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Quarterly Monitoring Report,October,1998 Canepa's Car Wash(Park Street) November 18,1998 Page 3 ..� TABLE 1 Groundwater Elevation Data(October 21, 1998) MW-1 through MW-7 46' Well Well Casing Well Collar Depth to Groundwater ID Screen Elevation Water Elevation Interval (feet) (feet) (feet) *- (feet- bgs) MW-1 45-65 10.97 23.91 -12.94 ` MW-2 45-65 10.37 24.77 -14.40 MW-3 45-65 11.76 25.42 -13.66 i6w MW-4 40-60 10.85 23.50 -12.65 Y MW-5 40-60 11.25 25.09 -13.84 MW-6 40-60 11.72 25.30 -13.58 16- MW-7 40-60 11.05 24.32 -13.27 4.2 Laboratory Analyses(TPH-G,BTEX,Oxygenates/Additives) The groundwater samples were analyzed by GeoAnalytical Laboratories, Inc. for total petroleum hydrocarbons - quantified as gasoline(TPH-G)by Method 5030/LUFT; for benzene,toluene, ethyl benzene, and total xylenes (BTEX) by EPA Method 602; and for selected gasoline oxygenates/additives by EPA Method 8260. The gasoline oxygenates/additives include methyl tertiary-butyl ether (MTBE), ethanol, tertiary-butanol, di- isopropyl ether(DIPS), ethyl tertiary-butyl ether(ETBE),and tertiary-amyl methyl ether(TAME). Laboratory analyses indicated that low concentrations of toluene(0.9 µg11),total xylenes (2.0 pg/1), and TPH-G (0.08 mg/1) were detected in the groundwater sample collected from monitor well MW-1. BTEX and TPH-G L' were detected in the sample collected from monitor well MW-2 at concentrations of 310 µg/l, 150 µg/l, 370 µg/1, 520 µg/l, and 15 mg/l, respectively. BTEX and TPH-G were detected in the sample collected from monitor well MW-3 at concentrations of 0.6 µg/1, 4.3 µg/1, 1.9 µg11, 1.2 µg/1, and 0.4 mg/1, respectively. BTEX and TPH-G were not detected at or above the laboratory reported detection limits in the sample collected from monitor well MW-4. BTEX and TPH-G were detected in the sample collected from monitor well MW-5 at relatively elevated concentrations of 3,000 µg/l, 1,400 µg/1, 540 µg/l, 690 µg/l, and 19 mg/l, respectively. Low concentrations of benzene (0.3 µg/1), toluene (1.6 µg/l), ethyl benzene (0.4 µg/1), and TPH-G (0.06 mg/1) were detected in the sample collected from monitor well MW-6. Low concentrations of benzene (0.4 µg/1), toluene (1.9 µg/I), and TPH-G (0.1 mg/1) were detected in the sample collected from monitor well MW-7. MTBE was i detected in the samples collected from monitor wells MW-4 and MW-6 at concentrations of 1.0 and 13 µg/1, respectively. None of the other selected gasoline oxygenates/additives, excluding DIPE, were detected at or above the laboratory reported detection limits in any of the groundwater samples. DIPE was detected at a �. concentration of 7.6 }tg/l in the sample collected from monitor well MW-5. A summary of the laboratory analytical results is presented in Table 2, on the next page, and in Figure 2, Appendix A. Laboratory report L� CoNoox