Environmental monitoring of remedial dredging at the New Bedford Harbor, MA, Superfund site
Environmental monitoring of remedial dredging at the New Bedford Harbor, MA, Superfund site
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DOI：
10.1007/s10661-005-8223-4
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发表时间：
2005-12-01
影响因子：
3
通讯作者：
Jayaraman, S
中科院分区：
文献类型：
--
作者：
Bergen, BJ;Nelson, WG;Jayaraman, S
马萨诸塞州新贝德福德港（NBH）是一个超级基金场地，因为沉积物中多氯联苯（PCB）浓度较高。从1994年4月至1995年9月，补救疏浚作业（称为“热点”）删除了污染最严重的沉积物（PCB浓度大于4000微克/克）从上港。在补救过程中，一项监测计划评估了对NBH和邻近的布扎德湾的潜在环境影响。监测计划是在联邦、州和地方当局的投入下制定的。建立了特定地点的决策标准，以评估蓝贻贝和棱纹贻贝（紫贻贝和Geukensia demissa，分别）中的PCB净运输，水柱毒性和PCB生物累积。补救工作已经完成，没有超过决定标准中规定的多氯联苯净迁移或急性毒性影响。此外，在这段时间内，贻贝中的多氯联苯生物累积并不明显大于操作前或操作后的测量。结果表明，大约14000立方码的高度多氯联苯污染的沉积物被永久删除，环境影响最小。在这次行动中吸取的经验教训，以及以前在现场进行的试点研究，将用于使NBH的全面补救工作更加有效和环保。
New Bedford Harbor (NBH), MA, is a Superfund site because of high polychlorinated biphenyl (PCB) concentrations in the sediment. From April 1994 to September 1995, a remedial dredging operation (termed the "Hot Spot") removed the most contaminated sediments (PCB concentrations greater than 4000 mu g/g) from the upper harbor. During remediation, a monitoring program assessed the potential environmental impacts to NBH and adjacent Buzzards Bay. The monitoring program was developed with input from federal, state, and local authorities. Site-specific decision criteria were established to assess net PCB transport, water column toxicity, and PCB bioaccumulation in blue and ribbed mussels (Mytilus edulis and Geukensia demissa, respectively). The remediation was completed without exceeding PCB net transport or acute toxicity effects specified in the decision criteria. In addition, PCB bioaccumulation in mussels during this time period was not significantly greater than pre- or post-operational measurements. The results indicated that approximately 14000 cubic yards of highly PCB contaminated sediment were permanently removed with minimal environmental effects. The lessons learned during this operation, as well as previous pilot studies at the site, will be used to make full-scale remedial efforts in NBH more efficient and environmentally protective.