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i lie 31 August 2004 AGE-NC Project No 95-0173 Page 5of10 I No other fuel components were detected from the laboratory analysis The laboratory report (CAL Reference No 6853) and chain-of-custody forms are presented in Appendix C, GeoTracker confirmation pages ofthe submitted laboratory electronic deliverable format(EDF)files are Included in Appendix G 3.0. SOIL VAPOR EXTRACTIONIIN-SITU AIR SPARGE SYSTEM Between 30 December 2003 and 24 March 2004,an SVE remediation system was continuously operated at the site,utilizing a regenerative vacuum blower to selectively apply an induced vacuum to wells VW-1 through VW-4 During this time, IAS remediation was continuously operated at the site on IAS well AW-2B(screened 60 to 70 feet bsg)utilizing an air compressor to inject airbeneath the water table SVE and IAS procedures for the site were described In the AGE-prepared Remedial Action Work Plan dated 30 December 1998, and approved by the SJCEHD by letter dated 20 April 1999 . 3 1 REMEDIATION SYSTEM PROCEDURES The SVE system utilized a manifold network of two-inch diameter, schedule 80 PVC piping Installed underground from SVE wells VW-1 through VW-7 to the inlet of the SVE remediation system The SVE remediation system comprises one 4%-horsepower, regenerative vacuum blower and two-1,000 pound carbon canisters In order to monitor efficiency of the SVE system, 1) a Magnehehc vacuum gauge (Dwyer DS-200 flow sensor) was installed prior to the inlet of the SVE unit so that air flow Is monitored, the flow rate was determined from the measured differential pressure and the piping diameter using a nomograph (Appendix B), 2) SVE air flow of the influent and effluent streams were monitored routinely for the presence of organic vapor using an organic vapor analyzer (OVA) equipped with I a photo-ionization detector(PID Thermo Environmental 580B, 10 0 eV,calibrated to isobutylene), and 3) Influent and effluent air flow vapor stream samples were collected from sampling ports installed upstream(influent)ofthe vacuum blower and downstream(effluent)ofthe carbon canisters and submitted for laboratory analysis Field measurements were recorded at regular intervals and are summarized in Table 6 Between 30 December 2003 and 24 March 2004, an induced vacuum was applied to SVE wells (VW-1 through VW-4) to extract hydrocarbon vapor from the subsurface Wells VW-5 through VW-7 were closed at the well-heads due to only trace levels of petroleum hydrocarbons previously _ observed from PID field measurements (Table 6) Advanced GeoEnvironmcntal,Inc I