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' 26 September 2002 <br /> • AGE-NC Project No 98-0448 <br />' Page 2 of 8 <br />' pH and conductivity were measured for stabilization at regular purge-volume intervals from each <br /> well utilizing an Oakton water analyzer Field data and logs are included with Appendix A Purged <br /> ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general <br />' public access <br />' 2 2 GROUND WATER SAMPLING <br /> Following well purging, the ground water level in each well was allowed to achieve a minimum of <br />' 80 percent recharge prior to sample collection, except for well MW-8, which achieved only 77 <br /> percent recharge Ground water samples were collected from the purged wells utilizing new, <br /> disposable polyethylene bailers and transferred into 40-m1 EPA-approved VOA vials containing 0 5 <br />' ml 18%hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping Ground water sample containers were labeled <br />' with the well designation, date, time, and sampler's initials <br /> lie2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br />' transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> • Total petroleum hydrocarbons quantified as gasoline(TPH-g)by EPA Methods 5030/8015 <br />' Modified, <br /> • Benzene,toluene,ethylbenzene and xylene(BTEX)with methyl tertiary-butyl ether(MTBE) <br />' by EPA Method 8020, and <br /> • 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EDB), tertiary butanol (TBA), di- <br /> isopropyl. ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and <br /> MTBE by EPA Method 8260 Modified <br />' 3.0. SOIL VAPOR EXTRACTIONIIN-SITU AIR SPARGE PROCEDURES <br />' Between 11 March and 11 June 2002, an SVE remediation system was continually operated at the <br /> site by applying an induced vacuum to wells VW-1 through VW-5 utilizing a regenerative vacuum <br />' blower and two 100-gallon carbon canisters During this time, IAS remediation was continually <br /> operated at the site on wells AW-1 through AW-4 utilizing an electric air compressor to inject air <br />' Advanced GeoEnvironmcntal,Inc <br /> I <br />