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' Site Background Information Former Stockton Plating Facility Page 5 of 7 k inlet of the vacuum blow�er, the outlet from the vacuum blower was routed through the catalytic r �' oxidizing unit A Magnehelic vacuum gauge was attached to the inlet of the blower The air flow was` ' monitored using a Dwyer DS-200 flow sensor The flow rate was determined from the measured' differential pressure and the piping diameter using a nomograph The vapor stream at the,SVE inlet ' wpi" Aas monitored for the presence of organic vapor using an OVA Sampling ports were installed upstream of the vacuum blower inlet to recover influent soil-gas vapor ,, ` stream samples, and downstream of the catalytic converter to recover effluent stream samples to r �ryr , ' monitor the efficiency of hydrocarbon destruction ,3 SVE System Design and Supplemental Energy s ' On 17 November 2003, a Solleco-manufactured EnvioPure 250 catalytic oxidizer soil-vapor extraction unit(SVE) was delivered to the site by AGE An SVE network was installed connecting wells VW-1 through VW-4, ground water extraction wells EW-1 and EW-2 and the SVE unit using ' 2-inch diameter schedule 40 PVC piping and 2-inch gate valves to control flow from individual _ wells, The piping was placed in trenches, approximately 12-inches below surface grade The two- ` inch networked SVE inlet was connected to the SVE unit The influent line was routed through a 55- gallon moisture knockout vessel to a 7 5-horsepower,250-maximum standard cubic feet per minute (scfrn) blower An in-line Dwyer Series 647 in-line differential pressure transmitter (DPT) was ' installed in the 2 5-inch influent line leading into the SVE catalytic oxidation unit This meter is i monitored monthly to calculated the influent rate On 18 November 2003,the electrical power source and electrical delivery lines were installed,the electrical line was inspected and approved by the City ; of Stockton Building Department on 08 December 2003 An electrical meter was also installed by Pacific Gas and Electric on 09 December 2003 Y ' � S t i S II SIII SVE Start-Up The EnviroPure 250 SVE system began operation on 09 December 2003 The initiation of the SVE ' operation was authorized by representatives of the'San Joaquin Unified Air Pollution Control District(APCD)and inspected by the EHD The SVE unit operation is conducted in accordance with ' APCD permit N-5011-1-0 s Measurement�of the SVE flow rate, vacuum (potential), concentrations of the extracted soil-vapor ' a and collection of a set of soil-vapor samples were observed by the EHD personnel The samples were collected to document baseline concentrations of hydrocarbon vapor in the soil-vapor extracted by the SVE network and to determine the SVE hydrocarbon destruction rate ! Advanced GeoEnvironmental,Inc 1 „f 4 i I e t '