ARCHIVED REPORTS_XR0008926 - Laserfiche WebLink

Home Browse Search

I ' 13 December 2004 AGE-NC Project No 99-0645 ' Page 4 of 7 ' 2 6 RE-ANALYSIS OF MONITORING WELL MW-3 On collection and review of the initial ground water data, the laboratory analysis detected the ' presence of TPH and BTEX. in ground water sample MW-3 for the first time, at relatively high concentrations (Table 2) On 29 November 2004, AGE personnel monitored, purged and sampled well MW-3 again for re-analysis,in order to verify the previous sampling results The same sampling ' procedures were followed for re-analysis ' 3.0 FINDINGS From field data collected at the SVE remediation system between 05 October and 17 November ' 2004,AGE determined the average TPH-g concentration and the average airflow rate,and calculated the approximate mass and volume of hydrocarbons removed Ground water elevation and flow direction were determined from the field data collected on 20 October 2004, hydrocarbon impact to ground water was Inferred from laboratory analysis of the samples ' • 3 1 SOIL-VAPOR EXTRACTION During the Fourth Quarter 2004, the SVE unit operated at an average air flow rate of 55 sefm, ' generating an induced vacuum (negative pressure) of approximately 18 and 24 inches of water, measured in the piping between the blower and extraction well The SVE unit operation was ' continuous over the quarter, since initiation 05 October TPH-g was detected from the influent SVE samples at a concentration of 12,000 ' micrograms liter(µg/I),BTEX compounds were detected at 15 pg/l, 450 µg11,40 µg/1 and 300 µg/l, respectively, and MTBE was detected at a concentrations of 160 µg/1 Contaminants of concern (COCl) were not detected In the effluent SVE sample 13 October TPH-g was detected from the influent SVE samples at a concentration of 3,900 µg/1, BTEX compounds were detected at 11 µg11,260 µg/I,27 µg/1 and 180 gg/l,respectively,and MTBE ' was detected at a concentrations of 130 µg/1 CDCs were not detected in the effluent SVE sample 21 October TPH-g was detected from the influent SVE samples at a concentration of 1,300 µg/l, ' BTEX compounds were detected at 8 µg/l, 87 µg11,28 µg/1 and 220 µg/l,respectively,while MTBE was detected at a concentrations of 340µg/I TPH-g was detected from the effluent SVE sample at a concentration of 110 µg/l and the BTEX compounds toluene, ethylbenzene and xylenes were ' detected at concentrations of 2 9 µg/1, 5 µg/1 and 40 µg/1, respectively, MTBE was not detected Advanced GeaEnvironmental,Inc 1