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installation . Following the estimated maximum transit time through the remainder of the decanting process, <br /> sampling should occur a minimum of once every 24 hours . If at any time elevated chloride levels are <br /> detected in the monitoring wells, pumping will be stopped and ponding depth will be reduced until additional <br /> corrective measures can be taken . These may include the installation of a system of well points around the <br /> dike to reverse groundwater flow. Operational experience has shown that dike permeability decreases as the <br /> dike material filters and traps the finer fraction of dredged sediments. Thus, saline seepage from the <br /> containment basin should become increasingly limited with each successive dredging operation . <br /> 3 .6 Migratory Bird Protection <br /> Should dredging be necessary during the migratory bird nesting season (April 1 through September <br /> 1 ), procedures presented in Appendix I of the Migratory Bird Policy (COE, 1993 ) will be implemented . <br /> These procedures include a variety of measures, summarized in Section 2. 5 , to ensure avoidance of impacts <br /> to migratory birds during periods of active dredging operations. <br /> 35 <br />