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' Quarteriv Monitoring Report,April 1999 Canepa's Car Watih{Par],street) Mai 31 1999 Page 3 TABLE I ' GROUNDWATER ELEVATION DATA (MAY 4, 1999) MW-1 THROUGH MW-7 ' Well Well Casing Well Collar Depth to Groundwater Ill Screen Elevation Water Elevation Interval (feet) (feet) (feet) ' (feet- bgs) MW-I 45 -65 1097 22 19 -1122 ' MW-2 45 -65 1037 2300 -1263 MW-3 45 -65 1176 23 54 -1178 ' MW-4 40-60 1085 2181 -1096 MW-5 40-60 1125 2322 -1197 ' MW-6 40-60 1172 2344 -1172 MW-7 40-60 1105 2252 -1147 ' 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/LU)~T, 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, dt- lsopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE), and tertiary-amyl methyl ether(TAME) ' Laboratory analyses indicate that low concentrations of toluene (0 3 gg/l)and TPH-G (0 06 mg/1) were detected to 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 concentrations of 200 Itg/l, 130 µg/l, 280 }tgl1, 390 gg/l, and 13 mg/l, respectively Toluene, ethyl benzene, and TPH-G were detected to the sample collected from monitor well MW-3 at concentrations of 2 6 pg/l, 0 5 ltg/1, and 0 1 mg/l, 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 to the sample collected from monitor well MW-5 at relatively elevated concentrations of 1,900 gg/l, 3,200 pg/1 660 µg/l, 1,600 ggd, and 19 mg/l, respectively Toluene was detected ' 1n the sample collected from monitor well MW-6 at a concentration of 0 6 gg/l Low concentrations of benzene (0 3 µg/l) toluene (1 4 gg/l), and TPH-G (0 08 mg/l) were detected to the sample collected from monitor well MW-7 MTBE was detected 1n the samples collected from monitor wells MW-1, MW-3, and MW-6 at I concentrations of 12, 4 9 and 12 gg/l, respectively DIPE was detected 1n the sample collected from MW-5 at a conccntratron of 6 3 gg/l None of the other selected gasoline oxygenates/additives were detected at or above the laboratory reported detection limits in any of the other groundwater samples However, it should be rioted that the laboratory lcported detection limits associated with the groundwater samples collected from MW-2 and MW-5 were raised with respect to the gasoline oxygenates/additives due to the presence of BTEX co nts 1 �� CONDOR