ARCHIVED REPORTS_XR0006029 - Laserfiche WebLink

Home Browse Search

I lie 31 August 2004 AGE-NC Project No 95-0173 IPage 6of10 3 2 IN-SITU AIR SPARGING SYSTEM PROCEDURES The IAS system utilized a 5 horsepower, Speedaire (model no 5F229B) electric air compressor to infect air beneath the water table From the outlet of the air compressor, a manifold network of one- Inch diameter, schedule 80 PVC piping was Installed underground to the well heads at IAS wells AW-1 through AW-7 and ground water monitoring wells MW-1 through MW-3 A Wilkerson oil I filter (model no M18) and Wilkerson air pressure regulator (model no R28) are installed at the outlet of the air compressor for added controls The infected air should volatilize dissolved hydrocarbons in ground water, and force hydrocarbon vapors into the vadose zone, where they can ' be withdrawn by the above SVE system Between 30 December and 24 March 2004, air pressure was continuously discharged from the air ' compressor to deeper screened well AW-2B between 13 and 15 psi Utilizing a Solinst water level indicator and a YSI-50 dissolved oxygen meter,measurements of ground water depth and dissolved oxygen from ground watermonitoring wells MW-1,MW-2 and MW-3 were performed to determine if ground water mounding was occurring as a result of the above IAS activities � . 3 3 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES A total of three sets of extracted air flow vapor samples were collected on 26 January, 23 February Iand 24 March 2004 from the influent and effluent of the regenerative vacuum blower unit to measure concentrations of hydrocarbon vapor The samples were collected in Tedlar bags using a hand air- vacuum pump Following sample collection, the samples were properly labeled, placed in a covered container and transported under chain-of-custody to either Castle Analytical Laboratory or Cal Tech Environmental Laboratories, both DHS-certified laboratories in California Each sample was analyzed within 72 hours of collection for TPH-g,BTEX and MTBE in accordance with EPA Methods 5030B/8015Cm IModified and 8021B 3 4 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE REMEDIATION FINDINGS From field and laboratory data collected at the SVE remediation system between 30 December 2003 and 24 March 2004, AGE determined the average TPH-g concentration, the average flow rate and calculated the approximate mass and volume of hydrocarbons removed 0 Advanced GeoEnvironmental,Inc