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' 25 November 2002 <br /> AGE-NC Project No 98-0448 <br /> 1 Page 2 of 8 <br />' water analyzer Field data and logs are included with Appendix A Purged ground water was <br /> containerized in 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 percent recharge prior to sample collection Groundwater samples were collected from the purged <br />' wells utilizing new,disposable polyethylene bailers and transferred into 40-m1 EPA-approved VOA <br /> vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure <br /> that 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 />' 23 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 McCambell Analytical Inc (MAI),a California Department ofHealth Services(DHS)- <br /> certified laboratory for analysis for <br />' • 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 /> • Methanol, ethanol, 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EDB), tertiary <br />' butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl <br /> ether (TAME) and MTBE by EPA Method 8260B <br /> 1 <br /> 3.0 SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE PROCEDURES <br />' Between 11 June and I 1 September 2002, an SVE remediation system was continuously operated <br /> at the site, utilizing a regenerative vacuum blower to apply an induced vacuum to wells VW-1 <br /> 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 /> Remedial Action Work Plan dated 07 July 2000, prepared by AGE, and approved by the EHD by <br /> letter dated 14 July 2000 <br /> IAdvanced GeoEnvironmental,Inc <br />