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i r <br /> I07 May 1999 <br /> • AGE-NC Project No 95-0104 <br /> IPage 2 of 8 <br /> with Appendix A Purged ground water was containerized in 55-gallon drums and was stored on-site <br />' in an area lacking general public access <br />' 2 2 GROUND WATER SAMPLING <br />' Following well purging activities, ground water levels in monitoring wells MW-1, MW-3, MW-4, <br /> MW-5,MW-6 and VW-I achieved a minimum of 80 percent recharge Prior to ground water sample <br /> collection,an additional gallon of ground water was purged from wells MW-1,MW-3,MW-4, MW- <br /> 5, MW-6 and VW-I utilizing a teflon bailer and new rope. Ground water samples were collected <br /> from the six purged wells utilizing new,disposable polyethylene bailers The retrieved samples were <br /> transferred into four 40-m1 EPA-approved VOA vials containing 0 5 ml preservative Care was taken <br /> I to ensure that visible air bubbles were not present in the vials after filling and capping Ground water <br /> sample containers were labeled with the well designation, date, time, and sampler's initials <br />' 2 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 />' in accordance with <br /> • EPA Method 8015M for total petroleum hydrocarbons quantified as gasoline (TPH-g), <br />' • EPA Method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene <br /> BTEX) with methyl-tertiary butyl ether (MTBE), and <br />' • EPA Method 8260 for tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl <br /> ether (ETBE), tert amyl methyl ether (TAME) and MTBE <br /> 3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE PILOT TEST PROCEDURES <br />' On 18 March 1999,a SVE/IAS pilot test was initiated at the site by applying a vacuum at well VW-1 <br /> and infecting compressed air into well MW-6, during the SVE/IAS pilot test operation, a total of four <br />' extracted soil gas samples were collected at the Inlet of the SVE unit SVE and IAS pilot test <br /> procedures for the site were outlined in a Letter Work Plan dated 02 dune 1998 prepared by AGE <br /> Iand approved by the PHS-EHD by letter on 15 June 1998 <br /> i <br /> Advanced GeoEnvironmental,Inc <br />