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首页> 外文期刊>International Journal of Soil, Sediment and Water >Characterization of Multiple Chlorinated Solvent Plumes Due to the Impact of TCE Screening Level Reduction
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Characterization of Multiple Chlorinated Solvent Plumes Due to the Impact of TCE Screening Level Reduction

机译：TCE筛选水平降低的影响对多种氯化溶剂柱的表征

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The reduction in the trichloroethylene (TCE) vapor phase screening level by the United States Environmental Protection Agency (USEPA) in 2004 prompted a re-evaluation of groundwater contaminant source areas, transport mechanisms, and commingling of multiple CVOC plumes within a complex river basin at a confidential site in the Midwest. A USEPA Administrative Order on Consent (AOC) dictated that the former owner of the facility investigate and perform residential and commercial vapor phase removal action to achieve compliance with revised indoor air and subslab action levels. The AOC did not differentiate contaminant source areas, transport, or commingled contaminants. In response, a comprehensive re-evaluation of the river basin hydrogeology and groundwater chlorinated volatile organic compound (CVOC) distribution was completed to facilitate demarcation of the AOC vapor phase removal action boundary and to minimize cleanup of contaminants not attributable to the facility. CVOCs, including TCE, are hydrophobic compounds that are heavier than water which tend to persist as residual contamination in aquifer matrix and bleed off slowly over time into the groundwater. In 2007, an integrated investigation and review of remediation reports filed with state regulators, USGS hydrogeologic reports, and historical groundwater elevation data was conducted. The data were evaluated to identify additional CVOC source areas, map known CVOC plumes, establish groundwater flow transport pathways, and determine the potential for commingled CVOC plumes. Understanding the complex groundwater flow regime, strongly influenced by river stages, flood control structures, municipal well field production, and engineered recharge basins, was critical to resolving the migration pathway of multiple CVOC plumes. All data collected was compiled into a series of CVOC overlay maps to provide a working river basin model of CVOC distribution and migration based on groundwater flow. The distribution of CVOC source areas results in numerous instances of CVOCs plumes becoming commingled due to the groundwater flow patterns. As a result, the former owner recommended the reduction of the AOC vapor phase removal action boundary area by over 60%, thus limiting the action area to immediately downgradient of the facility based on groundwater flow while identifying additional potential responsible parties (PRPs) for future cost recovery actions.
机译：2004年，美国环境保护署（USEPA）降低了三氯乙烯（TCE）气相筛查水平，这促使对位于复杂河流域的地下水污染物源区域，输送机制以及多种CVOC羽流混合进行重新评估。中西部的机密站点。美国环保局同意行政命令（AOC）规定，该设施的前所有者应调查并执行住宅和商业汽相去除行动，以确保符合修订后的室内空气和地下室行动水平。 AOC并未区分污染物源区域，运输或混合污染物。作为响应，对流域水文地质学和地下水含氯挥发性有机化合物（CVOC）分布进行了全面的重新评估，以促进对AOC气相去除作用边界的划分，并最大程度地减少了对非设施污染的清除。 CVOC（包括TCE）是比水重的疏水性化合物，它们往往作为残留污染物保留在含水层基质中，并随着时间的流逝而缓慢渗入地下水。 2007年，对州监管机构提交的补救报告，USGS水文地质报告以及地下水历史高度数据进行了综合调查和审查。对数据进行了评估，以识别其他CVOC源区域，绘制已知的CVOC羽流图，建立地下水流传输路径并确定CVOC羽流混合的可能性。了解复杂的地下水流态势，受河流级，防洪结构，市政井场生产和工程补给盆地的强烈影响，对于解决多种CVOC羽流的迁移途径至关重要。将收集的所有数据汇编成一系列CVOC覆盖图，以提供基于地下水流量的CVOC分布和迁移的有效流域模型。 CVOC源区域的分布导致许多CVOC羽由于地下水流型而混杂在一起的情况。因此，前所有者建议将AOC汽相去除作用边界区域减少60％以上，从而将作用区域限制为根据地下水流量立即降低设施的等级，同时确定未来的潜在责任方（PRP）成本回收行动。

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