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Kerman&11den 5 Manna IP't Quarter I998 Groundwater Momtortng April 16 1998 Page 8 4 SUMMARY/CONCLUSIONS On March 27, 1998, Condor personnel were on site to measure water levels and collect groundwater samples from the site monitor wells Laboratory analyses of groundwater samples collected from the site monitor wells indicated that BTFX, TPH-G and the selected gasoline oxygenates/additives were not detected at or above the laboratory reported detection limits in the sample collected from MW-1 or the Ansate sample (1432-MW5- 3/27/98) Fthanol, tertiary-butanol, DEPF, E TBE, and TAME: were not detected at or above the laboratory reported detection limits in any of the groundwater samples Detection limits for the analysts of the samples collected from MW-2 and MW-3 were raised, however, due to relatively high concentrations of M I BF in the samples collected from those wells (as described below) Benzene and TPH-G were not detected at or above raised detection limits and TEX constituents were detected ranging from 3 6 µg/1 to 43 µg/1 in the sample collected from MW-2 MTBE was detected at 110,000 pg/l in the MW-2 sample BTEX and TPH-G were not detected at or above the Iaboratory reported detection limits in the sample collected from MW-3 MTBE was detected at 1,900 µg/I in the MW-3 sample TPH-G was detected at 0 52 mg/1 and BTEX constituents were rdetected ranging from 1 5 µg/l to 100 µg/I in the sample collected from MW-4 MTBI was not detected at or above the laboratory reported detection limit in the MW-4 sample No floating product, sheen, or petroleum hydrocarbon odor was noted in the monitor wells ILaboratory analytical results of the groundwater samples for the first quarter, 1998, monitoring event were generally consistent with the historical quarterly groundwater analytical data MTBE concentrations in samples from MW-2, however, have increased by more than two orders of magnitude, total, during the three quarterly monitoring events conducted at the site Evaluation of intnnsic bioremediation parameters requires a data set that includes as much as one year of monitoring Additional monitoring of the intrinsic bioremediation parameters is necessary to evaluate the potential for intrinsic bioremediation at the site Groundwater elevation measurements collected at the site on March 27, 1998, indicated that the average depth to groundwater was approximately 5 feet bgs The average depth to water at the site increased by approximately 1 foot between December 31, 1997 and March 27, 1998 Groundwater elevation contours estimated using the depth- to-water measurements collected on March 27, I998, indicated that groundwater gradient at the site is generally consistent with the estimated gradient on September 18, 1997, and December 31, 1997 t� CONDOR