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i Quarterly Monitoring Report,October, I999 Canepa s Car Wash(Park Street) November 15, 1999 Page 4 ITABLE 2 LABORATORY ANALYTICAL RESULTS (OCTOBER 14 AND 15, 1999) I Other B T E X MTBE Oxygenates/ TPH-G Additives MONITOR Detection 03 03 03 06 10 1 0- 10 005 WELL/ BATE Limits—> µg/I µg/I µg/1 µg/l µg/I 40 Mg/1 SAMPLE Sample I D MW-1 10/15/99 2038-MW1-10/15/99 ND 06 ND ND ND ND 006 MW-2 10/14/99 2038-MW2-10/14/99 92 65 170 220 ND* ND* 75 MW-3 10/15/99 2038-MW3-10/15199 ND 06 ND ND 30 ND ND MW-4 10/15/99 2038-MW4-10!15199 ND ND ND ND ND ND ND MW-5 10/15/99 2038-MW5-10/15/99 4 100 4,800 660 1,900 ND* 5 7(RIPE) 26 MW-b 10/15/99 2038-MW6-10/15/99 ND 06 ND ND 12 ND ND MW-7 10/15/99 2038-MW7-10/15/99 ND 08 ND ND ND ND 0 06 Unit Conversions Analytical µg/1 parts per billion(ppb) B,T,E X=benzene,toluene,ethyl benzene,and total xylenes mg/1 parts per million(ppm) TPH-G=total petroleum hydrocarbons,quantified as gasoline MTBE=Methyl tertiary Butyl Ether Other Oxygenates/Additives=ethanol,Di-isopropyl ether(RIPE),Ethyl tertiary-Butyl Ether (ETRE),tertiary-amyl Methyl Ether(TAME),and tertiary-Butanol ND=not detected at or above the reported laboratory detection limit ND* = not detected at or above a laboratory reported detection limit, raised due to elevated concentrations of other constituents See laboratory reports for actual detection limits 5 DISCUSSION OF RESULTS Since September 1994, the groundwater elevation at the site has generally increased from approximately 35 to approximately 12 feet bmsl A hydrograph of monitor wells MW-1 through MW-7 (Figure 4, Appendix A) illustrates the fluctuation of the groundwater table The average depth to groundwater measured during the October 1999 groundwater monitoring event was approximately 23 8 feet below the monitor well measuring I points The groundwater elevation ranged from 11 99 to 13 67 feet bmsl The groundwater elevation contour map (Figure 3, Appendix A) indicates that the groundwater gradient at the site is generally towards the northeast This is consistent with previous monitoring results The laboratory analytical results for the October 1999 groundwater monitoring event are generally consistent with the laboratory analytical results for the July 1999 groundwater monitoring event None of the analytes of I concern were detected in the groundwater sample collected from monitor well MW-4 TPH-G and all BTEX constituents were detected in the groundwater samples collected from MW-2 and MW-5 Low concentrations of toluene and TPH-G were detected in the groundwater sample collected from MW-1 Low concentrations of toluene and MTBE were detected in the groundwater samples collected from MW-3 and MW-6 Low concentrations of toluene and TPH-G were detected in the groundwater sample collected from MW-7 DIPS was detected for the fourth time in the groundwater sample collected from MW-5 I CONDOR