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' L ' 14 February 2006 AGE-NC Project No 98-0448 ' Page 3 of 9 Services (DHS)-certified laboratory for analysis for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015M, ' • Benzene, toluene, ethylbenzene and xylene (BTEX) and methyl tert butyl ether (MTBE), 1,2-Dichloro ethane (1,2-DCA), ethylene dibromide (EDB), tertiary butanol (TBA), di- isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and ' MTBE by EPA Method 8260B 3.0. SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE PROCEDURES ' Between 07 September 2005 and 22 November 2005,an SVE remediation system was continuously operated at the site SVE remediation utilized a regenerative vacuum blower to selectively apply an induced vacuum to wells VW-1 and VW-6 During this time, IAS remediation was continually ' operated at the site on wells AW-4 (screened 25-30 feet),AW-5 (screened 30-35 feet)and MW-4B (screened 45-50 feet) Operation and design of the SVE and IAS systems for the site were described in Remedial Action Work Plan dated 07 July 2000,prepared by AGE,and approved by the EHD by ' letter dated 14 July 2000 ' On 23 November 2005, SVE remediation operations were suspended at the site as part of rebound response test ' 3 1 SOIL VAPOR EXTRACTION SYSTEM PROCEDURES ' The SVE system utilized a Fuji, 3-horsepower regenerative vacuum blower to volatilize and extract adsorbed hydrocarbon vapor from the subsurface A manifold network of two-inch diameter, Schedule 80 PVC piping was previously installed underground from wells VW-1 through VW-6 to ' a vapor moisture knockout drum and to the inlet of the regenerative vacuum blower,the outlet from the vacuum blower was discharged directly into the atmosphere due to low hydrocarbon concentrations in the vapor samples A PVC ball-valve was installed at each SVE well-head for ' added controls and so that the SVE network could be reconfigured when appropriate A Magnehelic vacuum gauge was attached to the inlet of the blower, air flow was monitored at the inlet using a Dwyer DS-200 flow sensor A flow rate was determined from the measured differential pressure and the piping diameter using a nomograph (Appendix B) IIn order to monitor the efficiency of hydrocarbon removal, 1) the SVE air flow of the influent . stream was monitored routinely utilizing an organic vapor analyzer(OVA) equipped with a photo- Advanced GcoEnvironmental,Inc I