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limit to the sample, collected from this well Floating product or sheens were not observed in the groundwater . removed tram the monitor wells ,Itg11t petroleum livdrocarbun odor was noted in the groundwater sample collected tram MW-4 Laborator} analytical results of tht, groundwater ,atmples collected during the second quarter, 1998 monitoring event werE generally consistent with historical quarterly groundwater analytical data Concentrations of MTBE ' detected in the sample, collected from MW-2 and MW-3 on June 26, 1998 appeared to reverse a trend of InLreastng concentrations historically detected to samples collected from these wells I Groundwater elevation measurements collected at the site monitor wells on June 26 1998 indicated that the average depth from tht `-,round surface to groundwater was approximately 5 feet Fhe average depth to water at The sitL was essentially the same on March 27 1998 and June. 26 1998 Groundwater elevation contours estimated using tht, depth-to-watcr measurements collected on lune 26 1998, indicated that the groundwater gradient at the site was gcncrally consistent with the estimated gradient on September 18, 1997, December 31, 1997 and March 27 1998 On September 30, 1998 a Condor representative was on site to conduct quarterly groundwater monitoring activities laboratory analyses of groundwater samples collected from the site monitor wells mduated that BTFX, TPI1-G and the selected gasoline oxygenates/additives were not detected at or above the laboratory reported detection hiritts to the sample collected from MW-1 Ethanol, tertiary-butanol, DIPI, and FTBIi were not detected at or above the laboratory reported detection Iii-nits in any of the groundwater samples The laboratory reported detection limits were raised for the groundwater samples collected from MW-2 and MW-3 due to rciattvely high concentrations of M I BE to the groundwater samples collected from those wells (as described below) I AMI was detected in the groundwater samples collected from MW-2 and MW-3 MTBF I was detected to the groundwater samples collected tram MW-2, MW-3, and MW-4 Beniene, ethyl benzene, total xylenes and I Pl1-C, wen, not detected at or above raised laboratory reported detection limits in the groundwater sample collected from MW-2 A low concentration of toluene was detected to tltt groundwater ' sample collected from MW-2 B I EX and TPH-6 were not detectLd at or above the laboratory reported detection limits to the groundwater sample collected from MW-3 the laboratory detection limits associated with the BTEX constituents were raised for this sample Relatively low concentrations of benzene, ethyl bt,nzene, total xylenes, and TPH-G were detected to the groundwater sample collected from MW-4 Toluene was not detected at or above a raised laboratory detection lima in the groundwater sample collected from this well Floating product or sheens were not observed to the groundwater purged from the monitor wells Petroleum hydrocarbon odors were not detected to the groundwater samples collected from the four monitor wells Laboratory analytical results of the groundwater samples collected during the third quarter, 1998, monitoring event were generally consistent with historical quarterly groundwater analytical data Concentrations of MTBE detected to the samples collected from MW-2 and MW-3 increased significantly with respect to the second quarter 1998 laboratory analytical results The concentration of MTBE reported for the sample collected from MW-3 on September 30 1998, was a historical high for this constituent in samples collected from this well IGroundwater elevation measurements collected at the site monitor wells on September 30, 1998, indicated that the average depth from the ground surface to groundwater was approximately 5 6 feet The average depth to water at the site increased by approximately one-half foot between June 26, 1998 and September 30, 1998 Groundwater elevation contours estimated using the depth-to-water measurements collected on September 30, 1998, indicated that groundwater gradient at the site was generally consistent with the estimated gradient on September 18, 1997 December 31, 1997, March 27, 1998, and June 26, 1998 On October 1, 1998, a Condor representative was on site to conduct quarterly surface water sampling activities and collect a sample of the marina's pre-treated and treated drinking water from the tacility's water treatment system Laboratory analyses of the surface water samples indicated that a low concentration of toluene was