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Work Plan For Remedial Approach and Well Installation 6 Ranch Market Site 23569 South Santa Fe Road Riverbank California May 2,2002 Monthly Catalytic Oxidizer Operation and Maintenance An operation and maintenance (O&M) manual will be prepared as a stand-alone document to assist personnel maintaining the operation and performing compliance monitoring of the remediation system. The system manual will include as-built drawings, monitoring and maintenance checklists and schedules,troubleshooting guides, and equipment operating manuals. The remediation system will be operated until cleanup goals are achieved or until such a time as the remediation effort is shown to no longer be technically or economically feasible such as when groundwater concentrations reach asymptotic levels. Site clean-up goals may eventually be determined by risk based corrective action assessment. Throughout the life of the system, its operation will be monitored, at a minimum, to verify permit compliance and to meet permit reporting requirements. As part of the system operation and maintenance, SECOR will visit the site two times per month to monitor and adjust the ozone sparging well configurations and the SVE extraction rates. Equipment maintenance and monitoring for fugitive emissions of ozone in the lateral piping trenches and well boxes will also be performed during the site visit. Monthly air samples will be collected from the influent and effluent vapor lines and analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX),TPHg, and MtBE using EPA method 8260. The air sample data will be compiled and tracked to comply with San Joaquin Air Pollution Control District Permit to Operate. SECOR estimates the catalytic oxidizer will run approximately four months. After four months the influent gasoline concentration in the extracted soil vapor will decline to a point where installation of blower and vapor phase granulated active carbon vessels will be more economic to operate. Catalytic Oxidizer Removal, Carbon Blower Installation,and Start-up After four months of operation, the catalytic oxidizer will be replaced with an H2Oil 7.5 hp SVE Skid with a 550-gallon water knock-out tank and two (2) 1,000 pound vapor phase carbon vessels. The existing air permit will be modified and a new permit to operate will be obtained. All required building and electrical permits will be obtained prior to conversion of the remediation system. The carbon blower system construction will commence upon procurement of all system construction and operation permits, completion of pre-field activities, and completion of well installation activities. SECOR and a licensed electrician will remove the catalytic oxidizer and install the new blower and carbon vessels. Daily logs will be made to document installation of the carbon SVE system and also maintain revisions to a job-copy of Fae:Re hMmket-aivet \Wor pbmTi market-Rend System