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Herman& Helen s Manna Fourth Quarter 1999 Groundwater Monitoring <br /> February 1 2000 <br /> Page -4- <br /> TABLE 2 <br /> Laboratory Analytical Results <br /> Groundwater Samples (December 22, 1999) <br /> IOxygenates/Additives <br /> B T E X TPH-G <br /> INITBE Ethanol tert.- DIPE ETBE TAME <br /> Butanol <br /> Detection 0 3 03 03 06 005 1 0 1 0 10 1 0 10 1 0 <br /> Lets µg/1 µg/1 4g/I 4g/1 tng/l 4g/1 4g/I µg/1 PLO µg/1 4g/I <br /> Analytical Method 602 602 602 602 5030/LUFT 8260 8260 8260 8260 8260 8260 <br /> Sample I D <br /> 1432-MW1-12/22/99 ND ND ND ND ND ND ND ND ND ND ND <br /> 1432-MW2-12122199 ND* 15 ND* ND* 03 100,000 ND* ND* ND* ND* ND* <br /> 1432-MW3-12/22/99 18 ND* ND* 5 1 009 10,000 ND* ND* ND* ND* ND* <br /> 1432-MW4-12/22/99 30 ND ND 26 01 ND ND ND ND ND ND <br /> Unit Conversions Analytical <br /> µg/l parts per billion(ppb) BTEX-benzene,toluene,ethyl benzene,and xylene <br /> mg/l parts per million(ppm) TPH-G-total petroleum hydrocarbons,quantified as gasoline <br /> MTBE=methyl tert-butyl ether <br /> tert Butanol=tertiary-butanol <br /> DLPE=di-isopropyl ether <br /> ETBE- ethyl ternary-butyl ether <br />' TAME=tertiary-amyl methyl ether <br /> ND=not detected at or above the laboratory reported detection limit <br /> ND*=not detected at or above a raised laboratory reported detection limit See laboratory report <br /> sheets for detection limits <br /> 3.4 GROUNDWATER CONTOURS <br /> Groundwater elevation measurements collected at the site on December 22, 1999, indicate that the average depth <br /> to groundwater was approximately 6 6 feet below the monitor well and surface water station measuring points <br /> The groundwater elevations for the wells and the surface water elevations are shown in Figure 4, Appendix A <br /> Figure 4 shows the estimated groundwater elevation contours on December 22, 1999 The contours mchcate a <br /> very steep groundwater gradient towards the island drainage channel <br /> I <br /> tJ CONDOR <br />