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首页> 外文会议>First International Conference on Remediation of Contaminated Sediments S1-2, Oct 10-12, 2001, Venice Italy >SEDIMENT SEQUENTIAL RISK MITIGATION AT THEA FOSS WATERWAY SUPERFUND SITE
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SEDIMENT SEQUENTIAL RISK MITIGATION AT THEA FOSS WATERWAY SUPERFUND SITE

机译：THEA FOSS水路超级站点的沉积物顺序风险缓解

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摘要

Sequential risk mitigation is a three-phase process designed to: (1) reduce the ecological and human health risks posed by highly contaminated sediments through confinement or capping; (2) reduce the risks associated with moderate levels of pollution on a less urgent schedule and at lower cost; and (3) address areas of limited contamination through a combination of natural attenuation and enhanced natural attenuation. Natural attenuation has as its basis the observation that ecosystem recovery appears to be largely a function of time. Sediment decomposition and the mixing of old sediments by bottom-dwelling organisms contribute to reduced contaminant concentrations. Knowledge of these processes is critical to the development of ecosystem recovery and waste management strategies. To evaluate the applicability of natural attenuation, information should be collected to determine whether surface sediment chemical concentrations will reach cleanup standards within a 10-year period through a combination of natural attenuation and adequate source control. The remedial design for the Thea Foss Waterway Superfund Site in Ta-coma, Washington, employs the sequential risk mitigation approach. The EPA has selected a remedy involving natural attenuation (21 acres [8.4 hectares]), enhanced natural attenuation (4 acres [1.6 hectares]), dredging (650,000 cubic yards [494,000 cubic meters]), and capping (30 acres [12 hectares]) of this 8,000-foot (2,438-meter)-long waterway. The dredged material will be disposed of in a near-shore confined disposal facility. Specialized design elements include sorbent capping of active oil seeps, about 400 feet (122 meters) of permanent sheet pile bulkhead, and other features related to long-term monitoring of the remedy and to controlling contaminant sources.
机译：减轻风险的顺序性过程分为三个阶段，旨在：（1）通过封闭或封盖减少高度污染的沉积物构成的生态和人类健康风险； （2）以较紧急的时间表和较低的成本降低与中等污染水平有关的风险； （3）通过自然衰减和增强的自然衰减相结合解决污染受限的区域。自然衰减的依据是生态系统的恢复似乎主要是时间的函数。底栖生物的沉积物分解和旧沉积物的混合有助于降低污染物的浓度。了解这些过程对于开发生态系统恢复和废物管理策略至关重要。为了评估自然衰减的适用性，应通过自然衰减和适当的源头控制相结合，收集信息以确定地表沉积物化学浓度在10年内是否达到净化标准。位于华盛顿州塔科马的Thea Foss水路超级基金站点的补救设计采用了顺序风险缓解方法。 EPA选择了一种补救措施，涉及自然衰减（21英亩[8.4公顷]），增强的自然衰减（4英亩[1.6公顷]），疏（（650,000立方码[494,000立方米]）和封顶（30英亩[12公顷]） ]）的8,000英尺（2,438米）长的水路。挖出的物料将在近岸密闭处置设施中进行处置。专门的设计元素包括活性油渗漏的吸附剂封盖，约400英尺（122米）的永久性板桩舱壁以及其他与长期监测补救措施和控制污染源有关的功能。

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