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' 26 December 2001 <br /> • AGE-NC Project No 97-0290 <br />' Page 2 of 8 <br />' data are included in Appendix A Purged water was stored on-site in labeled, 55-gallon, DOT- <br /> approved drums <br />' 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> I Water samples were collected from each purged well using the dedicated disposable plastic bailers <br /> Each water sample was transferred Into both 40-m1 volatile organic analysis(VOA)vials containing <br /> 0 5 ml 18%hydrochloric acid as a sample preservative <br />' After collection, the samples were properly labeled, placed in a chilled container and transported <br /> under chain-of-custody to McCampbell Analytical Laboratories Inc (MAI)of Pacheco, California, <br /> a California Department of Health Service(DHS)-certified laboratory The samples were analyzed <br /> for <br /> ITotal petroleum hydrocarbons as gasoline (TPH-g) in accordance with EPA Methods 8015 <br /> Modified and <br /> • Benzene,toluene, ethylbenzene and xylene(BTEX)in accordance with EPA Method 8020 <br /> f23 SOIL-VAPOR EXTRACTION AND IN-SITU AIR-SPARGING <br /> A soil vapor extraction system operated over the quarter, to remove hydrocarbons from soil vapor <br /> and dissolved hydrocarbons released from in-situ air-sparging system <br /> I The well network was previously installed from the ground level onto the roof of the building on- <br /> site, routed through a 2 5-horsepower, regenerative,100 standard cubic feet per minute (scfm) <br /> vacuum blower and through a moisture knockout vessels(55-gallon drums)for liquid separation and <br /> I to prevent water collection within treatment media The vapor influent line was then routed through <br /> two or three 55-gallon carbon canisters to adsorb hydrocarbon vapor from the extracted soil-vapor <br /> During the quarter the carbon media was changed on a regular basis, to allow for hydrocarbon <br /> destruction/adsorption The flow rate of soil-gas-vapor was measured using a Dwyer pressure flow <br /> meter Vacuum (potential) was measured at vapor extraction wells using a Magnehelic vacuum <br /> gauge The organic-vapor concentration in the extracted soil-vapor stream was measured before <br /> Ientering the blower (influent stream) and after exiting the carbon vessels using an organic vapor <br /> meter (OVM) equipped with a photo-ionization detector PID (Thermo Environmental 580A/B, <br /> 10 OeV, calibrated to isobutylene 100 ppb) <br /> • <br /> Advanced GeoEnwronmental,Inc <br /> I <br />