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Characterization of Crystalline Bedrock Contaminated by Dense Nonaqueous Liquid

机译：浓非水液体污染的结晶基岩的表征

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摘要

A systematic hydrogeologic site characterization has been completed in a fractured rock flow system, with the objective of identifying contaminant migration and fate pathways from a historical release of 1,1,1-trichloroethane (TCA). The study integrated hydrogeologic analysis techniques such as borehole geophysical logging, pumping test analysis, and hydrochemi-cal facies analysis to study the impact of a dense nonaqueous phase liquid (DNAPL) in a sparsely fractured crystalline bedrock. The assessment methodology can be divided into two parts: (1) characterization of the source area, where DNAPL is acting as a residual source of TCA, and (2) characterization of the downgradient plume. Reduction in DNAPL mass in the source area has resulted in significant and sustained reductions in downgradient concentrations, suggesting that remediation of fractured crystalline bedrock contaminated with DNAPL is possible and not "technically infeasible."
机译：在裂隙岩流系统中已经完成了系统的水文地质位点表征，目的是根据历史释放的1,1,1-三氯乙烷（TCA）来识别污染物的迁移和结局。这项研究综合了水文地质分析技术，例如钻孔地球物理测井，抽水试验分析和水化学相分析，以研究稠密非水相液体（DNAPL）对稀疏破裂的晶体基岩的影响。评估方法可分为两部分：（1）源区域的特征描述，其中DNAPL充当TCA的残留源；以及（2）下降羽状特征描述。源区DNAPL量的减少已导致梯度浓度的显着且持续的降低，这表明有可能修复被DNAPL污染的裂化结晶基岩，并且“在技术上不可行”。

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