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1 <br /> Quarterly Monitoring and Sensitive Receptor Survey Report <br />' Canepa's Car Wash(Park Street) <br /> November 5,2001 <br /> Page 4 <br /> tTABLE 2 <br /> GROUNDWATER SAMPLE LABORATORY ANALYTICAL RESULTS (OCTOBER 9,2001) <br />' MW-1 THROUGH MW-7 <br /> B T E X MTBE Other TPH-G <br /> Oxygenates/ <br />' Additives* <br /> MONITOR Detection 0 5 pg/L 0 5 Ag/L 0 5µg/L. 10µg/L 0 5 pg/L 0 5— 13 µg/L 0 05 mg/L <br /> Limits—;,11 <br /> WELL/SAMPLE DATE Sample I D <br />' MW-1 10/9/01 2038-MW 1-10/9/01 <0 5 <0 5 <0 5 <1 0 12 <0 5-13 0 091 <br /> MW-2 10/9/01 2038-MW2-10/9/01 150 67 120 280 <10 <10-25 16 <br /> MW-3 10/9/01 2038-MW3-1019101 23 <0 5 09 1 0 <0 5 <0 5-13 023 <br />' MW-4 1019101 2038-MW4-10/9101 <0 5 <0 5 <0 5 <10 28 <0 5-13 <0 05 <br /> MW-5 10/9101 2038-MW5-10/9/01 9,200 4,900 1,600 3,600 <50 1 <50-1,300 44 <br /> MW-6 10/9/01 2038-MW6-10/9/01 <0 5 <0 5 <0 5 <1 0 17 <5 0-130 0 049 <br />' MW-7 10/9/01 2038-MW7-10/9101 09 <0 5 <0 5 <I 0 <05 <0 5-13 0 091 <br /> IUnit Conversions Analytical <br /> tig/L parts per billion(ppb) B,T,E,X=benzene toluene ethyl benzene,and total xylenes <br /> mg/L parts per million(ppm) TPN-G=total petroleum hydrocarbons,quantified as gasoline <br />' MTBE=Methyl tertiary Butyl.Ether <br /> Other Oxygenates/Additives=ethanol,Di-isopropyl ether(RIPE),Ethyl tertiary-Butyl Ether <br /> (ETBE),tertiary-amyl Methyl Ether('TAME),and tertiary-Butanol <br /> *=See laboratory reports in Appendix C for actual laboratory reporting limits <br />' 5.0 DISCUSSION OF RESULTS <br /> 5.1 DISCUSSION OF GROUNDWATER ELEVATIONS <br /> The groundwater elevation at the site has generally Increased from approximately 35 feet bmsl to <br /> approximately 1 l feet bmsl since September 1994 A hydrograph of monitor wells MW-1 through MW-7 <br /> (Figure 3, Appendix A) illustrates the fluctuation of the groundwater table The average depth to <br /> groundwater measured in the monitor wells on October 9, 2001 was approximately 25 2 feet below the <br /> monitor well measuring points, which is approximately 16 to 22 feet above the top of all well screens <br /> The groundwater elevation ranged from 13 30 to 15 06 feet bmsl The groundwater elevation contour <br /> map (Figure 2, Appendix A) Indicates that the groundwater gradient at the site is generally towards the <br /> northeast This is consistent with previous monitoring results <br /> 5 2 DISCUSSION OF ANALYTICAL RESULTS <br /> The laboratory analytical results for the October 2001 groundwater monitoring event (see Figures 4 <br /> I through 8, Appendix A) are generally consistent with historical laboratory analytical results for the site <br /> BTEX and/or TPH-G were detected in the groundwater samples collected from. MW-1, MW-2, MW-3, <br /> MW-5, MW-6 and MW-7 Low concentrations of MTBE were detected in the groundwater samples <br />' collected from MW-1, MW-4, and MW-6 The fourth quarter 2001 laboratory analytical results generally <br /> indicate that the area of groundwater contamination most impacted by petroleum hydrocarbons is in the <br /> northern portion of the site in the vicinity of monitor wells MW-2 and MW-5 <br /> r � <br /> ILA CONAOR <br />