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Work Plan For Remedial Approach and Well Installation 7 <br /> Ranch Market Site,23569 South Santa Fe Road,Riverbank,California May 2,2002 <br /> the design drawings for preparation of as-built drawings. <br /> Monthly Operation and Maintenance of the SVE System with Vapor Phase Carbon <br /> As part of the system operation and maintenance, SECOR will visit the site one time per month <br /> to monitor and adjust the ozone sparging well configurations and the SVE extraction rates. <br /> Equipment maintenance and monitoring for fugitive emissions of ozone in the lateral piping <br /> trenches and well boxes will also be performed during the site visit. Monthly air samples will <br /> be collected from the influent and effluent vapor lines and analyzed for BTEX, TPHg, and <br /> MtBE using EPA method 8260. The air sample data will be compiled and tracked to comply <br /> with San Joaquin Air Pollution Control District Permit to Operate. <br /> Vapor Phase Carbon Change-Out <br /> After approximately 4 to 5 months of operation, SECOR estimates the carbon in the first vessel <br /> will be saturated and require replacement. A carbon profile sample will be collected and <br /> analyzed, the carbon will be profiled for disposal, and taken to a licensed regeneration facility. <br /> Quarterly Monitoring and Sampling <br /> Site groundwater monitoring and sampling will continue to be performed on a quarterly basis <br /> using the existing well array. Water will continue to be analyzed BTEX,TPHg, 1,2- <br /> dichloroethane (1,2-DCA), 1,2-dibromoethane (EDB), and five oxygenates: methyl-tertiary- <br /> butyl ether(MtBE), diisopropyl ether(DIPE),ethyl-tert-butyl ether(EtBE), tert-amyl-methyl <br /> ether(TAME), and tert-butanol (TBA), using Environmental Protection Agency(EPA)Method <br /> 8260B. <br /> SECOR recommends that well AS-1 be included in the current groundwater monitoring and <br /> sampling schedule. Since the well is completed with a screen set from 40 to 45 feet bgs, water <br /> samples will be able to track the progress of the remediation within the source area from a deep <br /> well screen. <br /> Quarterly Monitoring Reports <br /> Site groundwater monitoring and system efficiency reports will be prepared and submitted on a <br /> quarterly basis or in compliance with the air discharge permit requirements. System efficiency <br /> reporting will include summaries of mass extracted, mass extraction rates, and any <br /> modifications to system operation, which may have increased mass extraction rates. Extracted <br /> FJ,: bMarket-aivesbnnk\WotkpleusUtmxh t et-a SYstm <br />