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2. 3. 4 Weir-Mounted Stage Gauge <br /> Finally, to improve the contractor 's ability to monitor water levels and ponding depths within the <br /> basin, the contractor must install a stage gauge, or staff, constructed of UV-resistant PVC or fiberglass, to <br /> the front face of the weirs . Clearly marked in feet and tenths (as for a surveyor' s stadia rod) and leveled to <br /> NGVD, this gauge will provide a means for the contractor (as well as inspectors, site operators, or other <br /> personnel authorized to enter the IR- 14 facility) to directly read the water level within the basin from any <br /> position around the basin ' s perimeter. <br /> 3 .0 WEIR OPERATIONAL GUIDELINES <br /> 3 . 1 Introduction <br /> This section presents guidelines for operating the discharge weirs at FIND Site IR44 during all <br /> phases of operations for which the selected dredging contractor will be responsible as part of his <br /> contracted services. These guidelines are intended to supplement the guidelines contained in the site 's <br /> Management Plan (Taylor et al . , April 1992). In those cases where the guidelines presented here conflict <br /> with the guidelines presented in the Management Plan, the present guidelines supersede the guidelines <br /> contained in the earlier plan document. <br /> The remaining sections of this chapter are organized as follows . Section 3 .2 outlines requirements <br /> for installing the required shut-off valve on the weir outflow pipe and modifying the existing weir system <br /> consistent with the preliminary design modifications presented in Chapter 2 .0. Section 3 . 3 presents <br /> guidelines for setting the initial weir elevation before the start of dredging operations and for operating <br /> the weir system during dredging operations as required to control water level and ponding depths within <br /> the basin and to maintain effluent quality consistent with permit requirements. Section 3 . 3 also presents <br /> dike inspection requirements that may be triggered by excessive ponding depths within the basin. Section <br /> 3 . 4 presents guidelines for operating the weir system through the completion of decanting procedures, for <br /> securing the weir system to prevent unauthorized discharges following the completion of decanting, and <br /> for demobilizing from the site at the completion of contracted services. <br /> - 12 - <br />