ARCHIVED REPORTS XR0006993 - Laserfiche WebLink

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gasoline oxygenates/additives were detected at or above the laboratory reported detection limits in any of the surface water samples On March 26, 1999, Condor conducted first quarter, 1999, groundwater and surface water monitoring at Herman & Helen s Marina Laboratory analytical results of the groundwater samples collected during the first quarter 1999 monitoring :vent were generally consistent with historical quarterly groundwater analytical data fClroundwater elevation measurements collected at the site on March 26, 1999, indicated that the average depth to groundwater was approximately 5 5 feet below the monitor well and surface water station measuring points Phis average depth to water is 0 1 feet greater than the average depth to water measured on December 30, 1998 Groundwater elevation contours for March 26, 1999, indicated that the groundwater gradient at the site was generally consistent with the historical groundwater gradient Laboratory analytical results of the surfaLL water samples collected during the first quarter, I999, monitoring event were generally consistent with historical surface water analytical data for BTEX and TFH-G MTBE, however, was detected for the first time in the sample collected from IDCW (2 2 gg/1) MTBE was detected in samples DDN and DDS at significantly higher concentrations during the first quarter, 1999, monitoring event (980 and 3,500 gg/l, respectively) than in prior monitoring events Additionally, .CAME was detected for the first time in samples DDN and UDS On June 30, 1999 C ondor conducted second quarter, 1999, groundwater and surface water monitoring at Herman & Helen's Marina Laboratory analytical results of the groundwater samples collected during the second quarter, 1999, monitoring event were generally consistent with historical Quarterly groundwater analytical data Groundwater elcvanon measurements collected at the site on June 30, 1999, indicated that the average depth to groundwater was approximately 6 2 feet bc,low the monitor well and surface water station measuring points This average depth to water is 0 7 feet greater than thL average depth to water measured on March 26, 1999 Groundwater elevation contours for June 30, 1999, indicated that the groundwater gradient at the site is generally consistent with the historical groundwater gradient Laboratory analytical results of the surface water samples collected during the second quarter, 1999, monitoring event were generally consistent with historical surface water analytical data MTBE was detected for the second time in the sample collected from IDCW (1 4 4g/1) MTBE was detected in samples DDN and DDS at significantly lower concentrations during the second quarter, 1999, monitoring event (5 4 and 1 8 µg/l, respectively) than in the first quarter, 1999 monitoring event Additionally, TAME was not detected in any of the surface water sample during the second quarter, 1999, monitoring event As previously described, Mr Ronald Rowe of the PHS/EHD requested that nine soil borings be installed to further evaluate the eastern extent of groundwater contamination at the site The installation and sampling of the soil borings is pending receipt of site access authorization from off-site property owners