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' 08 June 2003 <br /> • AGE-NC Project No 98-0448 <br />' Page 3 of 9 <br /> of (1) utilizing a 2-Inch diameter, stainless steel hand bailer to `surge' the well and hand bail <br />' approximately 10 gallons of sediment and ground water, and (2) utilizing a Watera-Hydro-Lift II <br /> pump and%-inch diameter polyethylene tubing to remove approximately 20 gallons of sediment and <br />' ground water Ground water was bailed and/or pumped from well MW-4A until ground water was <br /> visually sediment free Purged ground water was containerized in properly labeled D O T -approved <br /> model 17H 55-gallon drums and was stored on-site In an area lacking public access <br /> IFollowing well redevelopment, well MW-4A was sampled and analyzed In accordance with the <br /> methods described in Sections 2 2 and 2 3 above <br /> I <br /> 3.0. SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE PROCEDURES <br />' Between 17 December 2002 and 20 March 2003, an SVE remediation system was continuously <br /> operated at the site, utilizing a regenerative vacuum blower to apply an induced vacuum to wells <br /> VW-1 through VW-5 During this time,IAS remediation was continually operated at the site on well <br /> MW-4B (screened 45 to 50 feet bsg) utilizing an electric air compressor to inject air beneath the <br />'. water table Operation and design of the SVE and IAS systems for the site were described in <br /> Remedial Action Work Plan dated 07 July 2000, prepared by AGE, and approved by the EHD by <br /> letter dated 14 July 2000 <br /> 3 1 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM PROCEDURES <br />' The SVE system utilizes a model Fuji, 3-horsepower regenerative vacuum blower and two <br /> 100-gallon carbon canisters to extract and adsorb hydrocarbon vapor from the subsurface Two-inch <br />' diameter, schedule 80 PVC piping was installed underground from wells VW-1 through VW-5 to <br /> the inlet of the regenerative vacuum blower,the outlet from the vacuum blower was routed through <br /> two sequential 55-gallon carbon canisters A Magnehelic vacuum gauge was attached to the inlet of <br />' the blower Air flow was monitored at the inlet using a Dwyer DS-200 flow sensor A flow rate was <br /> determined from the measured differential pressure and the piping diameter using a nomograph <br /> (Appendix B) <br /> IIn order to monitor the efficiency of hydrocarbon destruction, 1)the SVE air flow of the influent and <br /> effluent streams was monitored routinely for the presence of organic vapor using an organic vapor <br /> analyzer (OVA) equipped with a photo-ionization detector (PID Thermo Environmental 580A, <br /> 10 0 eV, calibrated to isobutylene) and 2) influent and effluent air flow vapor stream samples were <br /> collected from sampling ports installed upstream(influent)and downstream(effluent)ofthe vacuum <br /> Advanced GeoEnvironmental,Inc <br />