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• LFR, Inc. <br /> µg/1, respectively. The groundwater sample collected from well SP/M-3 contained <br /> xylenes (0.71 µg/1) only. <br /> • Groundwater samples collected from wells SP/M-4 through SP/M-6 and SP/M-8 <br /> did not contain BTEX compounds. <br /> Total petroleum hydrocarbon as gasoline (TPHg) was detected in six of the nine <br /> sampled wells at concentrations ranging from 0.25 mg/1 in the sample collected <br /> from SP/M-4 to 65 mg/l in the sample collected from SP/M-9. TPHd was detected <br /> in the same six wells at concentrations ranging from 0.089 mg/1 in the sample <br /> collected from well SP/M-7 to 1.6 mg/l in the sample collected from well SP/M-1. <br /> • Methyl tertiary-butyl ether (MTBE) was detected in the groundwater samples <br /> collected from wells SP/M-1 (1,100 µg/1), SP/M-3 (76 µg/1), SP/M-4 (4.5 µg/1), <br /> SP/M-6 (12 µg/1), SP/M-7 (4.0 µg/1), SP/M-9 (83,000 ttg/1), and SP/M-10 (120 <br /> µg/1). <br /> • The fuel oxygenate tertiary butyl ether (TBA) was detected in the groundwater <br /> samples collected from monitoring wells SP/M-1 (340 µg/1), SP/M-3 (73 µg/1), <br /> SP/M-7 (27 µg/1), and SP/M-9 (4,900 µg/1). <br /> • TBA, Di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), and tertiary <br /> amyl methyl ether (TAME) were not detected in the groundwater samples collected <br /> from SP/M-4 through SP/M-6, SP/M-8, and SP/M-10, although the laboratory <br /> reporting limits for some of these compounds were raised due to high <br /> concentrations of other constituents. <br /> • Methanol and ethanol were not detected in the groundwater samples collected from <br /> on-site wells during the fourth quarter of 2005. <br /> Known Compounds Source Known Concentration Range <br /> (soil/water/drum, etc.) (ppm, mg/kg, mg/1) <br /> Lowest Highest <br /> TPHg Groundwater ND 160 mg/L <br /> TPHd Groundwater ND 9.1 mg/L <br /> MTBE Groundwater ND 200 mg/L <br /> Benzene Groundwater ND 19 mg/L <br /> Toluene Groundwater ND 1.5 mg/L <br /> Ethylbenzene Groundwater ND 2.1 mg/L <br /> Total Xylenes Groundwater ND 5.4 mg/L <br /> TBA Groundwater ND 9.0 mg/L <br /> TAME Groundwater ND 0.46 mg/L <br /> mg/kg = milligrams per kilogram mg/L= milligrams per liter <br /> ND = Non Detect ppm =parts per million <br /> KMEPStockton-HASPv Ldoc:LFR Page 5 <br />