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ly p iwells 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 ndivdual 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 Senes,647 in-line differential pressure transmitter (DPT) was I installed in the 2 5-inch influent line leading into the SVE catalytic oxidation unit This meter is monitored monthly to calculated the influent rate On 18 November 2003,the electrical power source Y and electrical delivery lines were installed,the electrical line was inspected and approved by the City 'E of Stockton Building Department on 08 December 2003 An electrical meter was also installed by I I Pacific Gas and Electric on 09 December 2003 SVE Start-Up } ' s The EnviroPure 250 SVE system began operation on 09 December 2003 The initiation of,the SVE operation was authonzed by representatives of_the San,Joaquin Unified Air Pollution Control V District(APCD)and inspected by the EHD The SE unit operation is conducted in accordance with ` tAPCD permit N-5011-1-0 ' Measurement of the SVE flow rate, vacuum (potential), concentrations of the extracted soil-vapor 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 ' lie ' GROUND WATER EXTRACTION SYSTEM INSTALLATION Four 1 5-inch diameter, stainless steel QED Environmental model H23SET pneumatic powered, t down-well pumps were installed in vapor extraction wells VW-1, VW-2, VW-3 and VW-4 The ; pumps were internally equipped with a one-way check valve to prevent backflow The pumps were - installed in each well at a depth of approximately 45 feet bsg One-half inch diameter poly-vinyl ' chloride (PVC) tubing was routed from each pump to the top of each well casing and through a 2- +" inch diameter sanitary well seal In the remediation area, a manifold was created with independent 5 ' ' flow meters and a dedicated sampling port to allow sampling of each well independently without ; having to remove each respective well head assembly t On 02 February 2004; a 4-mch diameter,'stainless steel model 5S8 Grundfos Rediflow down-well a pump equipped with 230 volt'/2-horsepower 3-wire motors were installed in groundwater extraction " well EW-1 The Grundfos pump was installed in well EW-1 at a depth of approximately 65 feet below surface grade(bsg) Schedule 40, 1-inch diameter PVC tubing was routed from the pump to, ' the top of the well casing and through a 4-mch diameter sanitary well seal In the remediation area, an independent flow meter and a sampling port was installed to allow sampling of the well without' having to remove the well head assembly, ' 1 t t � � ;5113 I' 1 5 1 w