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Report—Monitor Well Installation and Sampling <br /> t New Jerusalem School <br /> February 26, 1999 <br /> Page-7 <br /> �- TABLE 3 <br /> f <br /> Groundwater Sample Analytical Results <br /> B T E X OXYGENATES/ADDITIVES TPH-G <br /> Detection 0.3 0.3 0.3 0.6 1.0µg/l 0.05 <br /> Limits: <br /> µg/l µg/l µg/l µg/1 10µg/l(tertiary-butanol) mg/1 <br /> Sample I.D. <br /> 2500-MW-1-12/29/98 ND ND ND ND F ND ND <br /> 2500-MW-2-12/29/98 ND ND ND ND ND ND <br /> • 2500-MW-3-12/29/98 ND ND ND ND ND ND <br /> 2500-IW-12/29/98 ND ND i ND ND I ND ND <br /> 2500-DW-12/29/98 ND ND ND ND ND ND <br /> i <br /> ` Unit Conversions: Analytical <br /> 1 lig/:parts per billion(ppb) B,T,E,X=benzene,toluene,ethyl benzene,and xylene. <br /> mgll:parts per million(ppm) TPH-G=total petroleum hydrocarbons,quantified as gasoline- <br /> Oxygenates/Additives=methyl tertiary butyl ether(MTBE);ethanol,tertiary-butanol, <br /> di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether <br /> (TAME). <br /> ND=none detected at or above laboratory detection limits. <br /> i <br /> 6. CONCLUSIONS/.RECOMMENDATIONS <br /> The native soil encountered during the installation of monitor wells MW-1, MW-2, and MW-3 generally <br /> consisted of approximately 17 feet of clay overlying sand. Laboratory analyses of the soil samples <br /> ' collected from MW-1, MW-2, and MW-3 indicate that BTEX, TPH-G, and MTBE were not detected at <br /> �.r or above the laboratory reported detection limits in the samples collected from various depths, with the <br /> exception of.the soil sample collected from five feet bgs in MW-1. Total xylenes were detected in this <br /> sample at a concentration of 7.3 µ.Ag. Laboratory analyses of�the groundwater samples collected from <br /> MW-1, MW-2, MW-3, and the facility's irrigation well and domestic water supply well indicate that ' <br /> BTEX,TPH-G, and MTBE were not detected at or above the laboratory reported detection limits. <br /> 3 <br /> The average depth to groundwater was approximately 8.8 feet bgs on December 29, 1998. The estimated <br /> groundwater gradient on December 29, 1998,was 0.23 ft/100 ft to the northeast. <br /> l �y <br /> ;1 <br /> tJ CONDOR <br /> f <br />