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' Site Background Information Former Stockton Plating Facility <br /> Page 5 of 7 <br /> inlet of the vacuum blower, the outlet from the vacuum blower was routed through the catalytic <br />' oxidizing unit A Magnehelic vacuum gauge was attached to the inlet of the blower The air flow was <br /> monitored using a Dwyer DS-200 flow sensor The flow rate was determined from the measured <br /> differential pressure and the piping diameter using a nomograph The vapor stream at the SVE inlet <br />' was monitored for the presence of organic vapor using an OVA <br /> Sampling ports were installed upstream of the vacuum blower inlet to recover influent soil-gas vapor <br />' stream samples, and downstream of the catalytic converter to recover effluent stream samples to <br /> monitor the efficiency of hydrocarbon destruction <br /> SVE System Design and Supplemental Energy <br />' On 17 November 2003, a Solleco-manufactured EnvioPure 250 catalytic oxidizer soil-vapor <br /> extraction unit(SVE) was delivered to the site by AGE An SVE network was installed connecting <br /> wells VW-1 through VW-4, ground water extraction wells EW-1 and EW-2 and the SVE unit using <br /> 2-inch diameter schedule 40 PVC piping and 2-inch gate valves to control flow from individual <br /> wells The piping was placed in trenches, approximately 12-inches below surface grade The two- <br /> inch networked SVE inlet was connected to the SVE unit The influent line was routed through a 55- <br /> gallon moisture knockout vessel to a 7 5-horsepower,250-maximum standard cubic feet per minute <br /> (scfm) blower An in-line Dwyer Series 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 On 18 November 2003,the electrical power source <br /> and electrical delivery lines were installed,the electrical line was inspected and approved by the City <br />' of Stockton Building Department on 08 December 2003 An electrical meter was also installed by <br /> Pacific Gas and Electric on 09 December 2003 <br /> SVE Start-Up <br />' The EnviroPure 250 SVE system began operation on 09 December 2003 The initiation of the SVE <br /> operation was authorized by representatives of the San Joaquin Unified Air Pollution Control <br /> District(APCD)and inspected by the EHD The SVE unit operation is conducted in accordance with <br />' APCD permit N-5011-1-0 <br /> Measurement of the SVE flow rate, vacuum(potential), concentrations of the extracted soil-vapor <br /> and collection of a set of soil-vapor samples were observed by the EHD personnel The samples were <br /> collected to document baseline concentrations of hydrocarbon vapor in the soil-vapor extracted by <br />' the SVE network and to determine the SVE hydrocarbon destruction rate <br /> 1 Advanced GeoEnvironmental,inc <br /> 1 <br />