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1 <br /> Quarteriy Monitoring Report April 2000 <br /> Cariepa s Car Wash(Part.Street) <br />' Page 4 <br />' TABLE 2 <br /> LABORATORY ANALYTICAL RESULTS (April 18 and 19,2040) <br />' <br /> Other <br /> B T I: X MTBE Oxygenates/ TPH- <br /> Additives" G <br /> MONITOR Reporting 0 3 03 0 3 06 l 0 10- 10 005 <br />' WELL/ DATE limits—* µL/L pg/L l.ig/L µs=*/L }tg/L Its,/L rng/L <br /> SAMPLE Sample 1 D <br />' MW-€ 4/18100 2038-MW1-4/18/00 ND ND ND ND ND ND 015 <br /> MW-2 4/19/00 2038-MW2-4/19/00 40 39 82 1 1 ND(100) ND(100-1 000) 9 <br /> MW-3 4/18/00 2038-MW3-4/18100 ND 14 ND ND ND ND 011 <br /> MW-4 4/18100 2038-MW4-4/18/00 ND ND ND ND ND ND ND <br /> MW-5 4/18/00 2038-MW5-4/18100 4,800 7,600 860 3 800 ND(100) ND(100-1 000) 47 <br /> MW-6 4/18/00 2038-MW6-4118100 ND ND ND ND 13 ND ND <br /> MW-7 4/19/00 2018-MW7-4/19100 ND ND ND ND ND ND 011 <br /> f lrsit(�1111YLISl(i1lS Ana__I�tic.�l <br /> ftg/L p arts per billion(pph) B r L X=benzene toluene ethyl benzene ind total xylenes <br /> • mg/L parts per million(ppm) TPH-G—total petroleum hydrocarbons quantified as gasoline <br /> MTBE=Methyl tertiary Butyl Ether <br /> Other Oxygenates/Additives = ethanol Dr-isopropyl ether (DfPE) Ethyl tcxhary-Butyl <br /> Ether <br /> (ETBE) tertiary-amyl Methyl Ether(TAME) and tertiary-Butanol <br /> *=See laboratory reports in Appendix C for actual laboratory reported detection limits <br /> ND=not detected at or above the laboratory reporting limit <br /> ND(X)=not detected at or above a raised laboratory reporting limit of X <br /> I5 0 DISCUSSION OF RESULTS <br /> 5 l DISCUSSION OF GROUNDWATER ELEVATIONS <br /> A hydtogtaph of monitor wells MW-1 through MW-7 (Figure 6, Appendix A) illustrates the fluctuation <br /> of the oroundwatef table, which shows that since September 1994, the groundwater elevation at the site <br /> has generally increased from approximately 35 feet bmsl to approximately 1 l feet binsl The average <br /> depth to groundwatet measured In the monitor wells on Api it 18, 2000 was approximately 22 4 feet <br /> below the monitor well measuring points, which is approximately 17 to 23 feet above the top ofall well <br /> screens The grotrndwatei elevation ranged from 10 44 to 12 19 feet bmsl The groundwater elevation <br /> Contour leap (rigure 2, Appendix A) indicates that the groundwater gradient at the site is generally <br /> Iowaids the northeast This ]s consrstentwrth previous monitoiing results <br /> 5 2 DISCUSSION OF ANALYTICAL RESULTS <br /> The laboratory analytical results fol the April 2000 gioundwatei monitoring event (Figures 3-5 and 7-10, <br /> Appendix A) are generally consistent with the laboratory analytical results from the January 2000 <br /> groundwater monitoring event The concentrations of benzene, toluene, total xylenes, and TPH-G <br /> detected in the groundwater sample collected from MW-5 represent historical highs for these constituents <br /> 0I <br /> L(� CONDOR <br />