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I <br /> 26 October 2004 <br /> AGE-NC Project No 97-0290 <br />' Page 2 of 6 <br />' in a chilled container and transported under chain of custody to Cal Tech Environmental <br /> Laboratories, (CTEL) a California Department of Health Service (DHS)-certified laboratory in <br /> Paramount, California The samples were analyzed for <br />' 0 Total petroleum hydrocarbons as gasoline (TPH-g) in accordance with EPA Method 8015 <br /> Modified, and <br />' 0 Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> in accordance with EPA Method 8021B <br /> 1 <br /> 23 SOIL-VAPOR EXTRACTION AND IN-SITU AIR-SPARGING <br />' A soil-vapor extraction/in-situ air sparging (SVE/IAS) system composed of 1) an SVE unit <br /> consisting of a 2 5-horsepower regenerative vacuum blower and three 85-gallon carbon canisters, <br />' and 2) an IAS system, utilizing a five horsepower air compressor, was in operation during the <br /> quarter <br /> The SVE system was monitored monthly and inspected or maintained regularly during operation <br /> In addition, because the SVE unit utilizes 85-gallon carbon-filled canisters to adsorb hydrocarbon <br />' vapor from the extracted soil-vapor, the carbon median was monitored A change of the carbon <br /> median was not required during the quarters <br />' During the SVE monitoring events,measurement ofthe flow rate,vacuum(potential),concentrations <br /> of hydrocarbons in the extracted soil-vapor and collection of an influent/effluent set of soil-vapor <br /> samples were conducted by AGE personnel The flow rate of soil-gas-vapor effluent was measured <br />' using a Blue-White direct measure flow rota-meter or Dwyer pressure flow meter Vacuum <br /> (potential)was measured at vapor extraction well network using a Magnehelic vacuum gauge The <br /> organic-vapor concentration in the extracted soil-vapor stream was measured before entering the <br />' SVE vacuum blower (influent stream) and after exiting the carbon vessels (effluent stream) using <br /> an organic vapor meter (OVM) equipped with a photo-ionization detector PID (Thermo <br /> Environmental 580, 10 OeV, calibrated to isobutylene 100 ppb) On 16 September the carbon <br /> adsorption vessels were removed from the site and SVE operation continued On approval of the <br /> soil-vapor extraction rebound analysis work plan by the EHD,the SVE unit was shut down for thirty <br /> days on 23 September 2004 <br />' The IAS system fluid(compressor oil)was maintained and checked regularly The air-spargmg flow <br /> rate was adjusted to approximately 4 standard cubic feet per minute (scfiii) by adjusting the IAS <br />' pressure to 6 pounds per square inch(psi)to each well(Table 2) SVE/IAS system maintenance field <br /> sheets are included in Appendix B <br /> Advanced GeoEnvironmental,inc <br />