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首页> 外文会议>Western Dredging Association Twenty-Second Technical Conference, Thirty-Fourth Texas Aamp;M Dredging Seminar, and Special Permanent International Association of Navigational Congresses Session, Jun 12-15, 2002, Denver, Colorado >Post-Dredging Economic Analysis for Remediation of PCB-Contaminated Sediment in the St. Lawrence River near Massena, New York
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Post-Dredging Economic Analysis for Remediation of PCB-Contaminated Sediment in the St. Lawrence River near Massena, New York

机译：纽约马塞纳附近圣劳伦斯河中多氯联苯污染的沉积物的疏D后经济分析

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摘要

The St. Lawrence River Remediation Project entailed the removal of 65,500 m~3 of PCB-contaminated sediment from near-shore areas along a 1.2 km long reach of the river. The initial budget for the project, prepared at the time the 1993 Record of Decision (ROD) was signed, was $72 million. Cost estimates developed during the design phase were based on completing the entire project in a single construction season (April-November). The final construction estimate, completed prior to mobilization, was $41 million. Through 2001, actual costs were slightly under the estimate; however, a second construction season (2002) will be needed to complete underwater capping in a small area (0.44-hectare). Although the project encountered significant complications and unexpected conditions, the final breakdown of costs does not vary significantly from the pre-mobilization estimate. Cost overruns during the 2001 construction season were observed in the construction of onshore sediment storage and handling areas, environmental monitoring, sediment processing, demobilization, and construction management. The overruns were attributed to problems in obtaining the required cleanup goals for sediment, which prolonged the overall project and led to considerably more dredging activities; unexpected complications regarding sediment handling and processing; and the need to greatly expand the scope of environmental monitoring activities. These overruns were offset by under runs for the sheet pile wall and silt curtain installation, dredging costs, landfill operations, and the offsite shipment of sediments. Under runs were attributed to competitive bidding of services and materials and the fact that smaller quantities of the more highly contaminated sediment requiring offsite disposal were generated by the dredging. The forecasted estimate at completion is $40,092,000, reflecting an underrun of $908,000. In terms of unit costs, contaminated sediment (wet) was removed at the rate of approximately $612/m~3. Using a wet weight of 1,220 kg/m~3, unit removal costs equate to $503 per metric ton. The remediation accomplished the removal of approximately 9,180 kg of PCB mass from the St. Lawrence River. Dividing these quantities into the total project cost, PCBs were removed at the rate of $4,367/kg.
机译：圣劳伦斯河整治项目需要从沿河1.2公里长的近岸地区清除65,500 m〜3的多氯联苯污染的沉积物。该项目的初始预算是在1993年《决定记录》签署时准备的，预算为7200万美元。在设计阶段制定的成本估算是基于在单个施工季节（4月至11月）完成整个项目的结果。在动员之前完成的最终建筑估算为4,100万美元。到2001年，实际费用略低于估计数；但是，将需要第二个施工季节（2002年）才能在小面积（0.44公顷）内完成水下覆盖。尽管该项目遇到了严重的复杂性和意外情况，但最终的成本细分与动员前的估计相差无几。在陆上沉积物存储和处理区的建设，环境监测，沉积物处理，复员和施工管理中，观察到2001年施工季节的成本超支。超支归因于在获得所需的沉积物清理目标方面存在问题，这延长了整个项目的时间，并导致更多的疏dr活动；有关泥沙处理和处理的意外并发症；并且需要大大扩大环境监测活动的范围。这些超支被板桩墙和淤泥幕的安装，疏ging成本，垃圾填埋场操作以及沉积物的异地运输的欠载所抵消。运行不足归因于服务和材料的竞争性招标，以及疏the产生了少量少量需要现场处理的污染程度更高的沉积物。预计完工时的估计数为40 092 000美元，不足908,000美元。就单位成本而言，被污染的沉积物（湿）的去除率约为612美元/ m〜3。使用1,220 kg / m〜3的湿重，单位去除​​成本相当于每公吨503美元。修复工作从圣劳伦斯河清除了大约9,180公斤的PCB物料。将这些数量划分为项目总成本后，PCB的去除率为4367美元/公斤。

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