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Human& lle14-n %Manna Fourth Quarter 2000 Ciroundwati.r Monrtaring January 12 2(X]1 Page 5 ' TABLE 2 Laboratory AnalytiLal Results of Groundwater Samples (December 13, 2000) ' Oxygenates/Additives S r E X I PH-G tert- MTBE Ethanol Butanot DIPE N rBE TAME ' Deicdton 0 3 0 3 0 3 06 0 05 l 0 l0 to 1 0 10 l 0 I units µg/l µg/1 µg/l µ0 mg/I µg11 µg/l µg/l µg/l µg/l µg/t Analvti(,al Method 8021B 8021B 802113 8021B 5030/L L1-T 8260E 8260B 8260E 8260E 82608 8260B ' Sample 1 D 1432-MW1-12/13/00 ND VD ND ND 'ND ND ND ND ND Nil ND ' 1432-MW2-12/13100 ND ND ND I ND ND 14,000 ND* ND* IIID* ND* 'SID* 1432-MW3-12/13/00 ND ND ND I ND ND 4,100 ND* 'SID* ND* ND- ND* ' 1432-MW4-12/13/00 34 ND 42 120 167 14 ND ND ND ND ND Unit Conversions Analytical 1ig/l parts per billion(ppb) BTEX=benzene toluene ethyl benzene,and total xylenes ' mg/I parts per million(ppm) TPH-G =total petroleum hydrocarbons quantified as gasoline MTBE=methyl tert-butyl ether tert Butanol =ttrtiary-butanol DIPS=di-isopropyl ether FTBF i.lhyt ttruary-butyl ether F1 rAME tertiary-amyl methyl ether ND not detected at or above the laboratory reported detection limit ' ND* - not detected at or above a raised laboratory reported detection limit See laboratory report sheets for detection lanits ' 3 4 GROUNDWATER CONTOURS Groundwater elevation measurements collected at the site on December 13, 2000, indicate that the average depth ' to groundwater was approximately 5 7 feet below the monitor well and surface water station measuring points The groundwater elevations for the monitor wells and the surface water elevations for the island drainage channel and slough are shown in Figure 4, Appendix A Figure 4 shows the estimated groundwater elevation ' contours on December 13, 2000 The contours indicate a steep groundwater gradient towards the island drainage channel Current and historical groundwater depth-to-water and elevation data are included in Table 3 on the next page 1 CONDOR