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r Quarterly Monitoring Report,October 2000 r Canepa's Car Wash(Park Street) • lauuary 18 2001 Page 4 r TABLE 2 r LABORATORY ANALYTICAL RESULTS (October 13,2000) Other B T E X MTBE Oxygenates/ TPH-G r Additives* MONITOR Detection 03 03 03 06 1 0 10— 10 005 WELL/ DATE Limits—+ pg/L pg/L 4g/L pig/L µg/L µg/L mg/L rSAMPLE Sample I D MW-1 10/13/00 2038-MWI-10/13/00 ND ND ND ND ND ND 042 r MW-2 10/13/00 2038-MW2-10113/00 32 130 32 100 ND(20) ND(20-200) 65 MW-3 10113100 2038-MW3-10/13/00 ND ND ND ND 55 ND 0 I 1 r MW-4 10/13/00 2038-MW4-10113/00 ND ND ND ND 25 ND ND MW-5 10/13/00 2038-MW5-10113/00 5,400 1,400 490 930 ND(20) ND(20-200) 27 MW-6 10/13/00 2038-MW6-10113100 ND 66 19 93 21 ND 016 rMW-7 10/13/00 2038-MW7-10/13/00 ND ND ND ND I ND ND ND Unit Conversions Analytical r lig/L parts per billion(ppb) B T,E X=benzene,toluene,ethyl benzene,and total xylenes mg/L parts per million(ppm) TPH-G=total petroleum hydrocarbons,quantified as gasoline MTBE=Methyl tertiary Butyl Ether I Other Oxygenates/Addftives = ethanol, Di-isopropyl ether(DIPS) Ethyl tertiary-Butyl Ether (ETBE) tertiary-amyl Methyl lather(TAME) and tertiary-Butanol *—See laboratory reports in Appendix C for actual laboratory reporting limits ' ND=not detected at or above the laboratory reporting limit ND(X)=not detected at or above a raised laboratory reporting limit See laboratory report sheets for reporting limits ' 5. DISCUSSION OF RESULTS r5.1 DISCUSSION OF GROUNDWATER ELEVATIONS The groundwater elevation at the site has generally increased from approximately 35 feet bmsl to ' approximately 1 1 feet bmsl since September 1994 A hydrograph of monitor wells MW-1 through MW-7 (Figure 5, Appendix A) illustrates the fluctuation of the groundwater table The average depth to groundwater measured in the monitor wells on July 12, 2000 was approximately 23 6 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 69 to 13 40 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 r5.2 DISCUSSION OF ANALYTICAL RESULTS ' The laboratory analytical results for the October 2000 groundwater monitoring event are generally consistent with the laboratory analytical results from the July 2000 groundwater monitoring event n r t, CONDOR