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15 November 2002 <br /> AGE-NC Project No. 95-0173 <br /> Page 2 of 8 <br /> measured from each well for stabilization at regular purge-volume intervals using an Oakton water <br /> analyzer. Field data and logs are included in Appendix A. Purged ground water was containerized <br /> in 55-gallon drums and was stored on-site in an area lacking general public access. <br /> r <br /> 2.2. GROUND WATER SAMPLING <br /> Following well purging,ground water levels in the wells achieved a minimum of 80 percent recharge <br /> prior to sample collection. Subsequently,ground water samples were collected from the purged wells <br /> utilizing new,disposable polyethylene bailers and transferred into 40-m1 EPA-approved VOA vials <br /> �- containing 0.5 ml 18% hydrochloric acid as a sample preservative. Care was taken to ensure that <br /> visible air bubbles were not present in the vials after filling and capping. Ground water sample <br /> containers were labeled with the well designation, date, time, and sampler's initials. <br /> 2.3. LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> After labeling,each ground water sample was logged on a chain-of-custody form,placed in a chilled <br /> container and transported to a California Department of Health Services(DHS)-certified laboratory <br /> to be analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015C <br /> �- Modified; <br /> • Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> by EPA Method 8021 B; and <br /> • MTBE,tert-amyl methyl ether(TAME),tertiary butanol(TBA),di-isopropyl ether(DIPS), <br /> ethyl tert butyl ether(ETBE), 1,2-dichloro ethane(1,2-DCA)and ethylene-dibromide(EDB) <br /> by EPA Method 8260B. <br /> 3.0. SOIL VAPOR EXTRACTIONIIN-SITU AIR SPARGE SYSTEM <br /> Between 11 June 2002 and 26 September 2002, SVE remediation was in continual operation at the <br /> site, utilizing a Solleco Ecat 250 catalytic converter vapor extraction system to apply an induced <br /> vacuum to wells VW-1 through VW-7;during this time,IAS remediation was selectively continued <br /> with air sparging through wells AW-1 through AW-7. SVE and IAS procedures for the site were <br /> described in the AGE-prepared Remedial Action Work Plan dated 30 December 1998,and approved <br /> by the EHD by letter dated 20 April 1999. <br /> Advanced GcoEnvironmcntal,Inc. <br />