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Based on an anticipated start-up VES process concentration of approximately 40,000 mg/m3,the use of a therm-ox will initially provide the most cost-effective control technology The cost effectiveness discussed herein is based on the cost to extract and process TPH-as-Gasoline on a per pound basis at the extraction concentrations expected Other viable control technologies ' such as an internal combustion engine or carbon adsorption will have operation and treatment costs greater than thermal oxidation The control technology for the VES off-gas will consist of a natural gas supported therm-ox rated at 100 scfm It is expected that the concentrations of extracted TPH-as-Gasoline vapor will decrease significantly within the first 3 months of system operation As the concentration of TPH-as- Gasoline vapor decreases, the cost of supplemental fuel (natural gas or propane) increases ' Typically, after 3 to 9 months of VES operation, conversion from therm-ox to catalytic oxidation (cat-ox) mode is performed to reduce supplemental fuel consumption costs For this reason, the VES treatment unit should be a combination therm-ox/cat-ox 4.3 VES Design 9 ' The CAP section included herein forms the basis for the detailed engineering design of the VES Regulatory review and approval of this PAR/CAP by San Joaquin County PHS/EHD is necessary, prior to initiating engineering design Regulatory approval of this PAR/CAP provides concurrence from PHSIEHD with the remediation technology and methods proposed to provide intenm site remediation Upon approval of this report by PHS/EHD, the preparation of operating permit submittals and engineering plans can proceed A construction and operation permit (Authority to Construct and Permit to Operate) is required from the SJVUAPCD Engineering plans form the basis for Ian review and building permit issuance b the Ci of 9 9P P 9P Y City ' Stockton Public Works and Planning Departments The building permit plan review and field inspections required for the construction of the VES principally relate to the new electrical and natural gas services required to operate the proposed therm-ox The plans also are necessary to depict the construction methods necessary to install the new electric and natural gas services in accordance with Pacific Gas and Electric(PG&E) requirements A recommended minimal content for engineering plans for the permitting of the VES is as follows ' • Site map showing the entry and termination routes for new electric and natural gas services, VES trench routes and remediation compound/fencing locations ' • Electrical schematic ("single line diagram") depicting electrical amperage loads, circuit designs for the VES and meter base/circuit breaker box construction details 16