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' Cleanup Plan October 27, 2003 Page 12 Competitive bids will be procured and a contractor will be selected based on the contractors' capabilities to perform the work and bid cost. ' Process equipment will be procured prior to construction based on specifications determined during the design phase. Equipment delivery will be coordinated to meet the construction scheduling needs ' of the selected contractor. 5.3.2 Construction Activities Sixty-five oxygenation points will be installed at the locations shown on Figure 7, prior to system construction. Construction of the system will commence upon receipt of all system construction and operation permits, pre-field activities, and well installation activities. SECOR will provide construction management during construction activities. This includes on-site management of contractor, subcontractors, and other SECOR personnel. A quality assurance representative will be present to document site activities using daily logs and photographs. The representative will verify compliance with design drawings, construction specifications, building permits, site health and safety plan, and construction schedules. The representative will also maintain revisions to a job-copy of the design drawings for preparation of as-built drawings. ' 5.3.3 Troubleshooting and Start-up 'w Upon completion of system construction, the system will be tested to verify the correct operation of all process equipment and controls, and to troubleshoot and repair any component of the system not operating correctly. Once operators determine that the system is fully operable, the official start-up ' will be performed. During startup, wells within 50 feet of an oxygenation point will be monitored for vapor-phase hydrocarbon concentrations using a photo ionization detector (PID). Wells will be monitored daily for the first week and weekly thereafter for the first month of operation to confirm that hydrocarbon vapor migration has not been induced. Data from the start-up will be tabulated as ' necessary to prepare a report, or reports. 5.3A Performance Monitoring The groundwater oxygenation system will be inspected and optimized monthly. Dissolved hydrocarbon concentrations including TPHg, TPHd, MtBE, TAME, TBA, 1,2-DCA, EDB, DIPE, EtBE and total lead will be monitored quarterly in on-site monitoring wells within the treatment area and annually in off-site temporary wells. Additionally, treatment area monitoring wells will be monitored for dissolved oxygen (DO) concentrations, pH, and oxidation-reduction potential (ORP), conductivity, ' total alkalinity, dissolved iron, manganese, sulfate, nitrate, ferrous iron, total organic carbon, and chemical oxygen demand (COD). Annual off-site performance monitoring is expected to be conducted during the third quarter of every year. Onsite treatment area wells are shown on Figure 7. ' A work plan for temporary well installation will be submitted under separate cover. 5.3.5 Reporting ' A cleanup implementation report will be prepared to summarize the results of the system installation • and excavation activities. The results of monthly performance monitoring will be included in each I:\Chevron\1001621\REPORTS\2003\2003-Cleanup Plan\Cleanup Plan.doc