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I <br /> 20 February 2003 <br /> AGE-NC Protect No 97-0290 <br /> Page 2 of 6 <br />' water sample was transferred Into 40-md volatile organic analysis (VOA)vials containing 0 5 nil 18% g <br /> hydrochloric acid as a sample preservative The samples were properly labeled, placed in a chilled <br /> container and transported under chain-of-custody to CalTech Environmental Laboratory (CTEL), a <br /> California Department of Health Service (DHS) - certified laboratory in Paramount, California The <br /> samples were analyzed for <br /> • Total petroleum hydrocarbons as gasoline (TPH-g) In accordance with EPA Methods 8015 <br /> Modified and <br /> • Benzene,toluene, ethylbenzene and xylene (BTEX) and methyl tertiary-butyl ether(MTBE) <br /> in accordance with EPA Method 8020 <br />' <br /> 23 SOIL-VAPOR EXTRACTION AND IN-SITU AIR-SPAR <br /> GING <br /> A soil vapor extraction/in-situ air sparging (SVE/IAS) system composed of 1) an SVE unit <br /> consisting ofa 2 5-horsepower regenerative vacuum blower and three 55-gallon carbon canisters,and <br /> 2) an IAS system, utilizing an air compressor, was in operation during the quarter The SVE system <br /> was monitored monthly and inspected or maintained weekly during operation In addition, because <br /> the SVE unit utilizes 55-gallon carbon-filled canisters to adsorb hydrocaibon vapor from the <br /> extracted soil-vapor, the carbon median was monitored and changed on a regular basis during the <br /> quarter to maximize hydrocarbon ads orplion/destruction or was de-activated when contaminant <br /> breakthrough occurred <br /> IDuring the monitoring event,measurement of the SVE flow rate,vacuum(potential), concentrations <br /> of hydrocarbons in the extracted soil-vapor and collection of a set of soil-vapor samples were <br /> conducted by AGE personnel The flow rate of soil-gas-vapor was measured using a Blue-White <br /> direct measure flow roto-meter or Dwyer pressure flow meter Vacuum(potential)was measured at <br /> vapor extraction wells using a Magnehelic vacuum gauge The organic-vapor concentration in the <br /> extracted soil-vapor stream was measured before entering the SVE vacuum blower (influent stream) <br /> and after exiting the carbon vessels using an organic vapor meter (OVM) equipped with a photo- <br /> ionization detector PID (Thermo Environmental 58013, 10 OeV, calibrated to isobutylene 100 ppb) <br /> The IAS system was maintained and the air-spargmg flow rate was adjusted to approximately <br /> 4 standard cubic feet per minute (scfm) and to a pressure of 6 pounds per square inch (psi) at each <br /> well <br /> • <br /> Advanced Geohnvironmentai,Inc <br />