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03 October 2003 <br /> AGE-NC Project No 97-0290 <br /> IPage 2 of 6 <br />' Each water sample was transferred Into 40-m1 volatile organic analysis (VOA) vials containing <br /> 0 5 ml 18%hydrochloric acid as a sample preservative The samples were properly labeled,placed <br /> in a chilled container and transported under chain-of-custody to McCampbell Analytical Laboratories <br /> Inc (MAI) of Pacheco, a California Department of Health Service (DHS) - certified laboratory in <br /> Paramount, California The samples were analyzed for <br /> • Total petroleum hydrocarbons as gasoline(TPH-g)in accordance with EPA Methods 8015C <br /> Modified and <br /> • Benzene,toluene, ethylbenzene and xylene(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> in accordance with EPA Method 8021B <br /> E23 SOIL-VAPOR EXTRACTION AND IN-SITU AIR-SPARGING <br /> I A soil vapor extraction/in-situ air spargmg (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 1AS system, utilizing a five horsepower air compressor, was in operation during the <br /> I� quarter The SVE system was monitored monthly and inspected or maintained regularly during <br /> operation In addition, because the SVE unit utilizes 85-gallon carbon-filled canisters to adsorb <br /> hydrocarbon vapor from the extracted soil-vapor, the carbon median was monitored A changed of <br /> Ithe carbon 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 /> I using a Blue-White direct measure flow roto-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 using an organic vapor <br /> meter (OVM) equipped with a photo-ionization detector. PID (Thermo Environmental 580B, <br /> 10 OeV, calibrated to Isobutylene 100 ppb) <br /> The IAS system was fluids were maintained and checked regularly The air-sparging flow rate was <br /> adjusted to approximately 4 standard cubic feet per minute (scfin)by adjusting the IAS pressure to <br />' 6 pounds per square inch (psi) to each well (Table 6) <br /> 1 <br /> I <br /> i <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />