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-�4 .. ... ... 3 - - ♦ 1 _ w r _ f. n ^t . �... NV W v 'rL y. !'!"„ -' <br /> r _ _AppendlxrA� Site Background lnfoxmation <br /> Former Stockton Plating Facility <br /> Page 5 of 7 <br />' The SVE system utilized two-Inch diameter, schedule 40 PVC piping installed underground from <br /> each well-head at vapor extraction wells and ground water extraction wells EW-1 and EW-2 to the <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 <br /> was 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 /> I <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 <br />' <br /> 55-gallon moisture knockout vessel to a 7 5-horsepower, 250-maximum standard cubic feet per <br /> minute (scfm)blower An in-line Dwyer Series 647 in-line differential pressure transmitter(DPT) <br /> was installed in the 2 5-Inch influent line leading Into the SVE catalytic oxidation unit This meter <br />' Is monitored monthly to calculated the influent rate On 18 November 2003, the electrical power <br /> source and electrical delivery lines were Installed,the electrical line was Inspected and approved by <br /> the City of Stockton Buildmg Department on 08 December 2003 An electrical meter was also <br />' installed by 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 <br />' were collected to document baseline concentrations of hydrocarbon vapor in the soil-vapor extracted <br /> • by the SVE network and to determine the SVE hydrocarbon destruction rate <br />' Advanced GeoEnvironmental,Inc <br />