ARCHIVED REPORTS_XR0008139 - Laserfiche WebLink

Home Browse Search

I - 17 November 1999 AGE-NC Project No 95-0128 Page 4 of 7 • TPH-d was detected in samples from all the properly-screened monitoring wells, except MW7, at concentrations as high as 9,000 4g/l (MW5), but was not detected in samples from the deeper-screen wells MW1, MW2 or MW3 • MTBE was detected in ground water samples collected from monitoring wells MW 1 through MVL'? Detected concentrations of MTBE ranged from 4 7 ug.'l (M«'1) to 300 g'! (MW5) • TBA was detected in samples from MW2, MW3, MW4, MW5, and MW6 at concentrations of 17 4g11, 5 2 µg/l, 15 µg11, 31 ,ug/l and 67 µg11, respectively • DIPE, TAME, and ETBE were not detected in the ground water samples collected during the 08 July 1999 ground water monitoring event Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in Tables 2 and 3 The laboratory reports for the quarterly monitoring event (MAI Laboratory ID No 15251 to 15258) QA/QC reports and chain-of-custody form are included in Appendix B MAI received extracted and analyzed the ground water samples on 28 October 1999 MAI issued Y �' p a report dated 05 November 1999 The analytical results from the ground water samples are as follows • During the October 1999 ground water monitoring event, trace quantities of vanous BTEX compounds were detected in the ground water samples from the drowned well MW 1, TPH-d was detected In the samples from MW2 and MW3 at concentrations of 85 4g/I, 88 µg/l respectively TPH-g was not detected in the samples collected from the drowned monitoring wells c Dissolved petroleum hydrocarbons were detected in samples collected from all the properly screened monitoring wells except the up-gradient monitoring well MW7 The highest concentrations of hydrocarbons were detected in the water sample from monitoring well MW5, which contained 55,000 4g/l TPH-g, 7,700 µg/1 TPH-d, 1,500 µg/I benzene, 4,900 µg/1 toluene, 3,800 µg/l ethylbenzene and 17,000 ug/l total xylenes The lowest concentrations of hydrocarbons were detected in the sample from monitoring well MW6, which contained 1 1 µg/1 toluene • The concentrations of dissolved TPH-g decreased an order of magnitude or more in samples from MW6 and VW 1, and increased an order of magnitude in the sample from MW4 • TPH-d was detected in samples from the properly-screened monitoring wells MW4, MW5, and VW1, at concentrations as high as 7,700 µg/l QI`4W5) IAdvanced GeoEnviron mental Inc I