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1 <br /> ' 27 October 2003 <br /> • AGE-NC Project No 98-0450 <br /> 1 Page 8of17 <br /> ' sections of sods at the site with analytical results of soil samples is depicted in Figure 3 and pre- <br /> remediation well network Cross Section is depicted in Figure 3a <br /> ' <br /> 33 SOIL-VAPOR EXTRACTION/AIR-SPARGE SYSTEM INSTALLATION <br /> ' The SVE system utilized two-inch diameter, schedule 40 PVC piping Installed underground from <br /> each well-head at vapor extraction wells VW-1 through VW-11 and monitoring wells BMW-3, <br /> ' BMW-4 and BMW-5 to the inlet of the vacuum blower, the outlet from the vacuum blower was <br /> routed through the catalytic converter On 30 June 2000, a SoIleco Ecat 250 catalytic converter soil- <br /> vapor extraction unit(SVE)was delivered to the site by AGE The influent line was routed through <br /> a moisture knockout vessel to a 7 5-horsepower, maximum 250 standard cubic feet per minute <br /> (scfin) blower An in-line Dwyer Serres 647 in-line differential pressure transmitter (DPT) was <br /> installed in the 2 5-inch influent line leading into the SVE catalytic oxidation unit This meter is <br /> ' monitored monthly to calculated the influent rate <br /> Each IAS well was networked to the IAS unit using 1-inch diameter schedule 40 PVC piping and <br /> ' • 1-inch gate valves to control injected air-volume to individual sparging wells The piping was placed <br /> below surface grade approximately 12 inches <br /> 34 SVE START-UP <br /> The Solleco Ecat 250 SVE system began operation on 17 July 2000 The initiation of the SVE <br /> operation was observed on 20 July 2000 by representatives of the San Joaquin Unified Air Pollution <br /> Control District(APCD) and of the EHD The SVE unit operation is conducted in accordance with <br /> ' AP CD permit N-4344-1-0 <br /> ' 35 SOIL-VAPOR EXTRACTION/A]R-SPARGE SYSTEM OPERATION <br /> ' The SVE system was monitored weekly for the first month of operation and monthly thereafter <br /> During each momtonng event, the flow rate of extracted soil-vapor(influent)was measured using <br /> an electrical DPT flow meter Vacuum potential was at two and one-half inch influent line using a <br /> magnehelic vacuum gauge Vapor samples were collected to document baseline concentrations of <br /> ' T hydrocarbon vapor in the soil-vapor extracted by the SVE network and to determine the SVE <br /> hydrocarbon destruction rate <br /> ' The organic-vapor concentration in the extracted soil-vapor stream was measured before entering <br /> the blower (influent stream) and after exiting the catalytic unit (effluent stream) using an organic <br /> 1 <br /> Advanced Geo£nvirvnmentai,Inc <br />