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D FT <br /> e. Space for additional groundwater treatment equipment, if needed in the <br /> future, and <br /> f. A service life of approximately 30 years. <br /> 4. Construction of groundwater conveyance lines: <br /> a. Install a subsurface pipeline to convey extracted groundwater from <br /> RPS-1 to the groundwater treatment plant shown as INFLUENT <br /> CONVEYANCE PIPE on Exhibit A; the means and methods of <br /> construction are to be determined and approved by the School District, <br /> but would likely involve a combination of open trench methods and <br /> directional drilling followed by surface restoration to match existing <br /> conditions. This activity would likely involve three to four weeks of <br /> construction. <br /> b. Install a subsurface pipeline to convey treated groundwater from the <br /> treatment plant to the injection wells, shown as EFFLUENT <br /> CONVEYANCE PIPE on Exhibit A. The means and methods of <br /> construction are to be determined and approved by the School District, <br /> but would likely involve a combination of above-ground pipe, open <br /> trench methods and directional drilling. This activity would likely <br /> involve three to four weeks of construction. <br /> c. Connection of treated groundwater pipeline to existing irrigation <br /> infrastructure for re-use of treated water for irrigation of Property <br /> grounds on an as-need basis. <br /> 5. Operation. Maintenance and Monitoring (OMM): The groundwater treatment <br /> plant will be maintained and operated by NUSA contractors. The treatment <br /> plant will be operated to remove volatile organic compounds (VOCs) from <br /> groundwater to levels that are below detection with currently applied laboratory <br /> methods. The overall duration of OMM activities conducted as part of this <br /> Work is difficult to predict,but is expected to be greater than 10 years and may <br /> be substantially longer. The following OMM tasks are anticipated to occur <br /> regularly over the duration of Work: <br /> a. OMM inspections: I — 2 hours duration by 1 to 2 technicians, on a <br /> weekly, biweekly or monthly basis, as required by the Regional Board, <br /> and when otherwise needed to maintain system operation, <br /> b. Routine sampling of groundwater from RPS-1, treatment system <br /> influent, midstream and effluent, per Regional Board requirements, to <br /> be performed during certain OMM inspections. <br /> c. Change of GAC media: anticipated to occur every 2 months, for a <br /> duration of 1 to 2 days for the duration of the Work. Change of GAC <br /> 3 <br />