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' 18 February 20 <br /> • ry Q3 <br />' AGE-NC Project No 98-0448 <br /> Page 2 of 8 <br />' regular purge-volume intervals from each well using the Oakton water analyzer Field data and logs <br /> are in Appendix A Purged ground water was containen4ed in properly labeled DOT-approved <br />' 55-gallon drums and was stored on-site in an area lacking general 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% recharge prior to sample collection except for well MW-4A, which achieved only 57% <br /> recharge Ground water samples were collected from the purged wells utilizing new, disposable <br /> polyethylene bailers and transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18% <br />' hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles were <br /> not present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's initials <br /> 1 <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br />'• Each ground water sample was Iogged on a chain-of-custody form,placed in a chilled containcr and <br /> transported to McCambell Analytical Inc (MAI),a California Department ofHealth Services(DHS)- <br /> certified laboratory for analysis for <br /> o Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015C <br />' Modified, <br /> • Benzene,toluene,ethylbenzene and xylene(BTEX)with methyl tertiary-butyl ether(MTBE) <br />' by EPA Method 8021B, <br /> • 1,2-Dichloro ethane (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 8260B <br />' 3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE PROCEDURES <br />' Between 11 September and 17 December 2002, an SVE remediation system was continuously j <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 infect air beneath the <br /> . water table Operation and design of the SVE and IAS systems for the site were described in <br /> Advanced GcoEnviron mental,Inc <br /> r <br />