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1 ' 26 December 7_001 ' AGE-NC Project No 97-0290 Page 3 of 8 ' 23 OXYGEN RELEASE COMPOUND DEPLOYMENT On 19 March 2001, five oxygen release compound (ORC) packages were installed at the site The ' ORC was In tube forms within 12-mch sock material Two 12-Inch sock packages of ORC were placed in wells MW-2, MW-4, MW-5, MW-6 and MW-7 by AGE The ORC was Installed below the water table at 55 feet below surface grade (bsg) The dissolved oxygen concentration was later ' measured ' 23 SOIL-VAPOR EXTRACTION A thermal oxidation SVE system was in operation at the site until 27 February 2001 The system was ' removed on that date in preparation for site re-development On 01 March 2001, the pre-existing SVE well network was routed through a 2 5-horsepower, ' regenerative, 100 standard cubic feet per minute (scfm) vacuum blower and through a moisture knockout vessels (55-gallon drums) for liquid separation and to prevent water collection within . treatment media The vapor influent line was then routed through two 55-gallon carbon canisters to adsorb hydrocarbon vapor from the extracted soil-vapor The flow rate of soil-gas-vapor was measured using a Dwyer pressure flow meter Vacuum(potential)was measured at vapor extraction ' wells using a magnehelic vacuum gauge The organic-vapor concentration in the extracted soil-vapor stream was measured before entenng I the blower (influent stream) and after exiting the carbon vessels or burner prior to 27 February (effluent stream) using an organic vapor meter(OVM) equipped with a photo-ionization detector PID (Thermo Environmental 580A, 10 OeV, calibrated to isobutylene 100 ppb) Soil-vapor samples were collected on 21 December 2000, 23 January and 21 February 2001 from the thermal oxidation system Soil-vapor samples were collected on 19 March, 05 April and 16 April 2001 from the carbon-adsorption system The soil-vapor samples were collected in Tedlar vapor bags using a vacuum pump attached to the influent and effluent stream The samples were labeled, placed in a pre-chilled cooler and transported under chain-of-custody to McCampbell Analytical, Inc (MAI) in Pacheco The samples were analyzed for the following • TPH-g in accordance with EPA Method 8015M and • BTEX in accordance with EPA Method 8020 On 16 April 2001,both the SVE and 1AS systems were dismantled and stored on site pending further operation On 17 April 2001, the SVE and IAS piping network was installed 36 inches below grade in preparation for additional site development Advanced GeoEnvironmental,Inc