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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 >Unexpected Conditions, Unforeseen Complications and Unplanned Expenditures: Lessons Learned in the Dredging of PCB-Contaminated Sediment from the St. Lawrence River
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Unexpected Conditions, Unforeseen Complications and Unplanned Expenditures: Lessons Learned in the Dredging of PCB-Contaminated Sediment from the St. Lawrence River

机译：意外情况，意外并发症和计划外支出：从圣劳伦斯河疏of多氯联苯污染的泥沙中吸取的教训

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摘要

In the spring of 2001, an ambitious dredging project was kicked off in Massena, New York. The objective: remove an estimated 77,000 yd~3 of PCB-contaminated sediment from the St. Lawrence River opposite the former Reynolds Metals Company St. Lawrence Reduction Plant. A 3800-ft long sheet pile wall to isolate the remediation area from the river was installed, within which contaminated sediment were dredged using specialized clamshell buckets and hauled ashore for dewatering, processing and disposal. The project was exquisitely detailed and diagramed, from the expected percentage of analytical variability in sediment PCB analyses down to the timing, in minute and seconds, of each bucket cycle, for the work had to be accomplished in one season--the sheet pile wall had to be pulled and equipment demobilized before the river froze. A number of complications ensued, both onshore and on the water, requiring frequent departures from the expected flow of work and schedule. In the end, work was being driven as much by the Contingency Plan as it was by the Final Design and Work Plan. Many lessons were learned, which fall into several broad categories, including equipment and labor; pre-dredging bottom conditions and extent of contamination; and regulatory oversight. On the positive side, a lot of things did work well, and by many measures it could be considered one of the more successful environmental dredging projects completed in the U.S. A major accomplishment was outstanding safety performance―there were no lost time accidents or injuries even though at its peak there were two 10-hour shifts per day employing over 150 construction personnel, engaged in a multitude of dangerous tasks. In addition, the project successfully removed 65,500 m~3 of contaminated sediment containing over 9,000 kilograms of PCBs from the river.
机译：在2001年春季，一个宏伟的疏project项目在纽约马塞纳（Massena）启动。目标：从原雷诺兹金属公司圣劳伦斯还原厂对面的圣劳伦斯河中，除去估计受PCB污染的沉积物约77,000 yd〜3。安装了一个3800英尺长的板桩墙，将整治区与河流隔离开来，其中使用专用的翻盖式铲斗将污染的沉积物疏and并拖到岸上进行脱水，处理和处置。从沉积物PCB分析中预期的分析变异百分比到每个铲斗周期的分钟和秒的时间，该项目进行了详尽的细致设计和绘制，因为这项工作必须在一个季节内完成-板桩墙在河冻结之前，必须将其拉开，并遣散设备。随之而来的是陆上和水上的许多复杂情况，需要经常偏离预期的工作流程和时间表。最后，应急计划和最终设计与工作计划都在推动工作。我们吸取了很多教训，这些教训分为几大类，包括设备和劳力。预挖底部条件和污染程度；和监管监督。从积极的方面来说，很多事情都做得很好，而且从许多方面来看，它可以被认为是在美国完成的更成功的环境疏projects项目之一。主要成就是出色的安全性能-甚至没有浪费时间的事故或伤害。尽管在高峰期每天要进行两次10小时轮班，雇用150多名建筑工人来完成许多危险的工作。此外，该项目还成功清除了河流中65,500 m〜3的污染沉积物，其中含有9,000多千克多氯联苯。

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