Craney Island Disposal Area PDF Download

The Craney Island disposal ara is a 2,500-acre confined dredged material disposal facility located near Norfolk, VA. In 1981, the Craney Island Management Plan (CIMP) was developed to extend the useful life of the site for disposal of maintenance material from the project area. The CIMP called for subdivision of the site into three subcontainments and use of alternating filling and dewatering cycles. Management of the site in general accordance with the CIMP was implemented in 1984. This report documents site operations and monitoring data for the Craney Island disposal area from Oct 1980 to Sept 1987. Field sampling operations, laboratory testing, and monitoring and survey data are described and interpreted. Based on the monitoring data collected to data and projections of future fill rates, the site will be filled to elevation +30 ft during FY 2000 if the present intensity of management is continued. If the site had not been subdivided and management for dewatering not initiated, the site would fill during FY 1997. Therefore, the CIMP as implemented to date will result in a gain in useful life of approximately 3 years or 2% of the remaining capacity. Differences are due to a combination of factors, including inaccuracies of models in projecting long-term fill rates, inefficiencies in implementing the CIMP, natural inefficiencies of desiccation processes, and the placement of significant volumes of new work material in the site.