• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Western Dredging Association technical conference >Unexpected Conditions, Unforeseen Complications and Unplanned Expenditures: Lessons Learned in the Dredging of PCB-Contaminated Sediment from the St. Lawrence River
【24h】

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

机译：意想不到的条件，不可预见的并发症和无计划的支出：从圣劳伦斯河的PCB受污染沉积物中疏浚的经验教训

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

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年的春天，一个雄心勃勃的疏浚工程是马塞纳，纽约拉开序幕。目的：除去的估计77000码〜3从圣劳伦斯河前者雷诺金属公司圣劳伦斯还原设备相对PCB污染的沉积物。安装甲3800英尺长的板桩壁的修复区域从河隔离，其内污染的沉积物，使用专门的蛤壳式铲斗疏浚和岸上拖拉脱水，处理和处置。该项目是精美的详述和可图示，来自分析变异性沉积物PCB的预期百分比分析下到定时，在分和秒中，每个桶循环的，对于工作必须在一个季节到完成 - 板桩壁不得不拉和设备河水都结冰之前复员。一些并发症接踵而至，陆上和水面上，需要从工作和计划​​的预期流动频繁列车。最后，工作驱动尽可能多的应急计划，因为它是由最终的设计和工作计划。许多获得经验，它分为几大类，包括设备和劳动;预疏浚底条件和污染程度;和监管。从积极的一面，很多事情没有工作好，被许多措施也可能被认为是美国的一个主要成就完成的比较成功的环保疏浚项目的一个非常出色的安全性能，甚至有没有时间损失的事故或伤害虽然在其高峰期共有从业人员超过150施工人员每天两个10小时轮班，从事危险的任务，众说纷纭。另外，该项目成功移除污染沉积物的65500米〜3含有超过9000公斤从河多氯联苯。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号