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Quarterly Monitoring Report,April 2001 � . Canepa's Car Wash(Park Street) May 28,2001 Page 4 TABLE 2 ' LABORATORY ANALYTICAL RESULTS (APRM 12 AND 13, 2001) Other ' B T E X MTBE Oxygenates/ TPH-G Additives* MONITOR Detection 03 03 03 06 to 1 0- 10 005 WELL/ DATE Limits—* µg/L Ag/L µg/L µg/L ug/L µg/L mg/L SAMPLE Sample I D MW-1 4/13/01 2038-MW1-4/13/01 ND ND ND ND ND ND ND MW-2 4/13/01 2038-MW2-4/13/01 41 25 48 56 ND(20) ND(20-200) 73 MW-3 4/12/01 2038-MW3-4/12/01 ND ND ND ND 68 ND ND MW-4 4/12/01 1 2038-MW4-4/12/01 ND ND ND ND 20 ND ND MW-5 4/13/01 2038-MW5-4/13/01 4,000 3,000 920 2,300 ND(200) ND(200- 29 2,000) MW-6 4/12/01 2038-MW64/12/01 21 57 20 80 ND ND 07 MW-7 4/13/01 1 2038-MW7-4/13/01 ND ND ND ND ND ND ND Unit Conversions Analytical µg/L. parts per billion(ppb) B,T,E X=benzene,toluene,ethyl benzene,and total xylenes mg/L parts per mullion(ppm) TPH-G=total petroleum hydrocarbons,quantified as gasoline MTBE=Methyl.tertiary Butyl Ether Other Oxygenates/Additives=ethanol,Di-isopropyl ether(DIPE),Ethyl tertiary-Butyl Ether (ETBE),tertiary-amyl Methyl Ether(TAME),and tertiary-Butanol *=See laboratory reports in Appendix C for actual laboratory reporting lunits ND=not detected at or above the laboratory reportmg limit ND(X)=not detected at or above a raised laboratory reporting limit See laboratory report sheets for reporting limits 5. DISCUSSION OF RESULTS 5.1 DISCUSSION OF GROUNDWATER ELEVATIONS ' The groundwater elevation at the site has generally increased from approximately 35 feet bmsl to approximately 11 feet bmsl since September 1994 A hydrograph of monitor wells MW-1 through MW-7 (Figure 3, Appendix A) illustrates the fluctuation of the groundwater table The average depth to ' groundwater measured in the monitor wells on April 12, 2001 was approximately 23 4 feet below the monitor well measuring points, which is approximately 16 to 22 feet above the top of all well screens The groundwater elevation ranged from 11 53 to 13 25 feet bmsl The groundwater elevation contour map (Figure 2, Appendix A) indicates that the groundwater gradient at the site is generally towards the northeast This is consistent with previous monitoring results 5.2 DISCUSSION OF ANALYTICAL RESULTS The laboratory analytical results for the April 2001 groundwater monitoring event(see Figures 4 tbrough 10, Appendix A) are generally consistent with the laboratory analytical results for the January 2001 Igroundwater monitoring event BTEX and TPH-G were detected in the groundwater samples collected IL� CONDOR