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Empirical Assessment Of Ground Water-to-indoor Air Attenuation Factors For The Cdot-mtldenver Site

机译:Cdot-mtldenver场地的地下水对室内空气衰减因子的经验评估

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The area surrounding the Colorado Department of Transportation Materials Testing Laboratory in Denver was the subject of intense investigation, involving the collection of thousands of ground water, soil-gas, and indoor air samples in order to investigate indoor air impacts associated with a subsurface release of chlorinated solvents. The preremediation portion of that data set is analyzed and reduced in this work to ground water-to-indoor air attenuation factors (α_(gw) = the ratio of the measured indoor air concentration to the soil-gas concentration predicted to be in equilibrium with the local ground water concentration). The empirical α_(gw) values for this site range from about 10~(-6) to 10~(-4) with an overall average of 3 × 10~(-5) (μg/L indoor air)/(μg/L soil gas). The analysis of this data set highlights the need for a thorough data review and data screening when using large data sets to derive empirical relationships between subsurface concentrations and indoor air. More specifically, it is necessary to identify those parts of the data that contain a strong vapor intrusion pathway signal, which generally will require concentrations well above reported detection levels combined with spatial or temporal correlation of subsurface and indoor concentrations.
机译:丹佛科罗拉多州运输材料测试实验室周围的区域是密集调查的对象,涉及数千种地下水,土壤气体和室内空气样本的收集,以调查与地下释放物相关的室内空气影响。氯化溶剂。分析该数据集的预修复部分,并在这项工作中将其减少至地下水对室内空气的衰减因子(α_(gw)=测得的室内空气浓度与预测的土壤气体浓度处于平衡状态的比率)当地地下水浓度)。该位置的经验α_(gw)值范围约为10〜(-6)至10〜(-4),平均平均值为3×10〜(-5)(μg/ L室内空气)/(μg/ L土壤气体)。该数据集的分析突出表明,在使用大数据集得出地下浓度与室内空气之间的经验关系时,需要进行彻底的数据审查和数据筛选。更具体地说,有必要确定数据中包含强蒸汽侵入途径信号的那些部分,这些部分通常将需要远高于所报告的检测水平的浓度以及地下和室内浓度的时空相关性。

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