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i10 December 2001 AGE-NC Project No 98-0448 IPage 3of8 I beneath the water table 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 PHS-EHD by letter.dated 14 July 2000 3 1 SOIL VAPOR EXTRACTION/TN-SITU AIR SPARGE SYSTEM PROCEDURES Between 01 July 2001 and 30 September 2001, the SVE and IAS remediation systems were operational at the site The SVE system utilizes a model Fuji, 3-horsepower regenerative vacuum blower and two 55-gallon carbon canisters to extract and adsorb hydrocarbon vapor from the subsurface Two-inch diameter, schedule 80 PVC piping was installed underground from wells VW-1 through VW-5 to the inlet of the regenerative vacuum blower, the outlet from the vacuum I blower was routed through two sequential 55-gallon carbon canisters A Magnehehc 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 Idiameter using a nomograph (Appendix B) The SVE air flow of the influent and effluent streams was monitored routinely for the presence of organic vapor using an organic vapor analyzer(OVA) equipped with a photo-ionization detector(PID Thermo Environmental 580A, 10 0 eV, calibrated lie to isobutylene) Sampling ports were installed upstream of the vacuum blower inlet to recover SVE influent air flow vapor stream samples, and downstream of the vacuum blower to recover effluent I SVE air flow samples to monitor the efficiency of hydrocarbon destruction Field measurements were recorded at regular intervals between 01 July and 30 September 2001 and are summarized in Table 5 32 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES Between 01 July and 30 September 2001, a total of six extracted air flow vapor samples were collected from the influent and effluent streams 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 placed in a covered container and transported under chain-of-custody to either McCampbell Analytical Laboratory(MAL) in Pacheco, California Each sample was analyzed within 72 hours of collection for TPH-g and BTEX in accordance with EPA IMethods 5030/8015 Modified and 8020 Advanced CeoEnvtronmentai,Inc