ARCHIVED REPORTS XR0006991 - Laserfiche WebLink

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I monitoring event VII BL was detected in samples DDN and DDS (980 and 3,500 pg/l respectively) at significantly higher concentrations than in previous and subsequent monitoring events Additionally, the only surface water Sample detections of TAME were reported in samples DDN and DDS during the First quarter, 1999 monitoring event During the third quarter monitoring event, however, MTBE was detected in sample DDN at a much lCWei concentration (1 7 gg/l) and was not detected in sample DDS MTBE was detected for the third time in the sample collected from IDCW ( 1 6 µg/l) ' On December 22 1999 condor conducted fourth quarter, 1999 groundwater and surface water monitoring at the site Laboratory analytical results of the groundwater samples collected during the fourth quarter 1999, ' monitoring event arc generally consistent with historical quarterly groundwater analytical data Benzene and Fr total xylenes were detected for the second time in the groundwater sample collected from MW-3 ' (groundwater elevation measurements collected at the site on December 22, 1999, indicated that the average depth to groundwater was approximately 6 6 feet below the monitor well and surface water station measuring points Ihis average. depth to water was 0 1 feet greater than measured on September 23, 1999 Groundwater elevation contours for December 22 1999 indicated that the groundwater gradient at the site was generally consistent with the historical groundwater gradient ' The laboratory analytical surface water sample data for the fourth quarter, 1999, monitoring event were generally representative of historical data, with the exception of the first quarter, 1999, data During the first quarter, 1999, monitoring event, MTBF was detected in samples DDN and DDS (980 and 3,500 pg/1, respectively) at I significantly higher concentrations than in previous and subsequent monitoring events Additionally, the only surface water sample detections of TAME- were reported in samples DDN and DDS during the first quarter, 1999 monitoring event During the fourth quarter 1999, monitoring event, however, MTRY was detected in 'ie samples DDN and DD5 at much lower concentrations (2 7 and l 5 p.g/l, respectively) As previously dcscribcd Mr Ronald Rowe of the PHS/- HD requested that nine soil boring,, be installed to further evaluate the eastern extent of groundwater contamination at the site the installation and sampling, ofthL soil borings is pending receipt of site access authorization from off-site property owners I I 1 I I