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s <br /> 3 . 2 Site Preparation and Pre-Dredging Operations <br /> 3. 2. 1 Installation of Shut- Off Valve <br /> To ensure the ability to prevent any possible uncontrolled discharge from the weir system, the <br /> contractor must install an approved shut-off valve on the discharge pipeline attached to the weir system . <br /> The contractor must submit valve specifications for review and approval by the Project Engineer as an <br /> element of his preconstruction submittals . The installation recently completed at 1711'41) Site SJ44 <br /> suggests that the installation at Site IR- 14 may require a ductile iron resilient wedge gate valve; however, <br /> the contractor may submit other valve designs for review and approval by the Project Engineer. <br /> Installation must conform to the valve manufacturer' s specifications, and must be completed before <br /> performing the required system leak test . Closure of the shut-off valve at any time that water flows <br /> through the valve must follow the valve manufacturer's recommendations for the pressures and flow <br /> velocities at the time of the closure. <br /> 3. 2. 2 Installation of Effluent Discharge Pipeline <br /> With the shut-off valve installed and fully closed, the contractor may begin to install the weir <br /> discharge pipeline that will extend from the shut-off valve 850 f ± to the shoreline of the Indian River <br /> (ICWW) . This pipeline will remain in place following the contractor 's demobilization from the site as <br /> required to discharge stormwater and drainage from the basin. As a permanent installation, the pipeline 's <br /> construction details (e. g. , buried vs. at grade, allowable slopes , etc.) must be addressed during the <br /> project' s final design phase to reflect a topographic survey of the pipeline route . Section 3 .4 .2 discusses <br /> the periodic release of stormwater following the contractor' s demobilization. <br /> 3. 2. 3 Installation of Required Weir Modifications <br /> Simultaneous with or immediately following the installation of the shut-off valve, the contractor <br /> must complete all required weir modifications including installation of the I-beam channel flange <br /> extensions (Section 2 . 3 . 1 ), fabrication of all required weir boards (Section 2 . 3 .2), and installation of the <br /> weir scaffolding and ladder system as required to access and install the weir boards (Section 2 . 3 . 3). <br /> - 13 - <br />