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Quarterly Monitoring Report January, 1999 Canepa s Car Wash(Pari.Street) February 8, 1999 Page 3 TABLE 1 GROUNDWATER ELEVATION DATA (JANUARY 20, 1999) IMW-1 THROUGH MW-7 ' Well Well Casing Well Collar Depth to Groundwater ID Screen Elevation Water Elevation Interval (feet) (feet) (feet) ' (feet- bgs) MW-1 45 -65 1097 23 50 -1253 ' MW-2 45 -65 1037 2425 -13 88 MW-3 45 -65 1 1 76 2478 -1302 MW-4 40-60 10 85 2305 -1220 MW-5 40-60 11 25 2440 -1315 MW-6 40-60 1172 2466 -1294 MW-7 40-60 1 1 05 23 81 -1276 ' 4 2 Laboratory Analyses (TPH-G,BTEX, Oxygenates/Additives) The groundwater samples were analyzed by GeoAnalyttcal Laboratories, Inc for total petroleum hydrocarbons - quantified as gasohne(TPH-G) by Method 5030/LUFT, for benzene, toluene, ethyl benzene, and total xylenes I (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 indicate that low concentrations of toluene (0 6 lig/1)and TPH-G (0 07 mg/1) were detected in the groundwater sample collected from monitor well MW-1 BTEX and TPH-G were detected in the sample ' collected from monitor well MW-2 at concen trat tons of 280 µg/l, 160 lig/l, 370 lig/l, 500 tig/l, and 8 4 mg/1, respectively BTEX and TPH-G were detected in the sample collected from monitor well MW-3 at concentrations of 0 5 µg/l, 4 6 µg11, 0 6 ltg/l, 0 6 µg/l, and 0 3 mg/1, respectively BTEX and TPH-G were not ' deteLted at or above the laboratory reported detection limits in the sample collected from monitor well MW-4 BTEX and TPH-G wet e detected in the sample collected from monitor well MW-5 at relatively elevated concentrations of 2,000 µg/l, 2,200 µg/l, 600 µg/l, 1,200 lig/l, and 12 mg/l, respectively Low concentrations of benzene (1 6 ltgll), toluene (1 3 µg/1) and ethyl benzene (0 3 µg/l) were detected in the sample collected from ' monitor well MW-6 Low concentrations of benzene (0 4 pg/1), toluene (1 8 µg/l), and TPH-G (0 1 mg/1) were detected in the sample collected from monitor well MW-7 MTBE was detected to the samples collected from monitor wells MW-4 and MW-6 at concentrations of 5 4 and 13 pg/l, respectively None of the other selected ' gasoline oxygenates/additives were detected at or above the laboratory reported detection limits in any of the groundwater samples A summary of the laboratory analytical results is presented in Table 2, on the next page, and in Figure 2, Appendix A Laboratory report sheets indicating analytical methods used, detection limits, and ' L1 CONDOR