ARCHIVED REPORTS_XR0005713 - Laserfiche WebLink

Home Browse Search

I 26 February 2001 AGE-NC Project No 95-0173 ' Page 7 of 8 collected from wells MW-2, MW-3, MW-4, MW-6, MW-13, AW-1A, AW-1B and AW-2B I (Table 2) The TPH-g and BTEX decreases may be due to air sparging activities • Previous and curl ent laboratory results of ground water samples suggest that there is a minor MTBE_impact to ground water in the areas of wells MW-3 and MW-4 (Table 2) Jam_ �- - Laboratory i esults of ground water samples collected from MW-13 (screened 95 to 100 feet f bsg) suggest that the dissolved petroleum hydrocarbon plume extends at least 100 feet bsg, ' r and is at least 70 feet thick ' Based on SVE remediation data collected between 01 October 2000 and 31 December 2000, AGE concludes ' • The volume of hydrocarbons extracted from the inlet of the SVE system was calculated to be approximately 203 gallons of petroleum hydrocarbons (Appendix E) during the fourth ' quarter 2000 monitoring period • Since initiation of the SVE system, the total volume of petroleum hydrocarbons extracted is estimated to be approximately 613 gallons (Appendix F) ' An average SVE inlet flow rate 99 cubic feet per minute (cfm), an average differential pressures of 3 4 inches of water, average induced vacuum of 18 inches of water (Table 5) ' • No general concentration trends were evident in the PID field measurements or results of laboratory analysis of soil-gas vapor samples over the monitoring period 6.0. RECOMMENDATIONS ' Based upon fourth quarter 2000 data collected from the site, AGE recommends ' • Continued quarterly ground water monitoring and sampling of wells MW-1 through MW-13, AW-lA, AW-1B, AW-2A and AW-2B, ground water sampling results will be used to monitor progi ess of the SVE and IAS remediation system • Continued operation of the on-site SVE and IAS remediation system, remediation progress will be reevaluated on a quarterly basis Advanced CeoEnvironmental,Inc 1