Vapor intrusion (VI) is the migration of subsurface vapors, including radon and volatile organic compounds (VOCs), from the subsurface to indoor air. The VI exposure pathway extends from the contaminant source, which can be impacted soil, non-aqueous phase liquid, or contaminated groundwater, to indoor air-exposure points. Therefore, contaminated matrices may include groundwater, soil, soil gas, and indoor air. VOC contaminants of concern typically include halogenated solvents such as trichloroethene, tetrachloroethene, and chloroform, as well as petroleum hydrocarbons, such as the aromatic VOCs benzene, toluene, and xylenes. Radon is a colorless radioactive gas that is released by radioactive decay of radionuclides in rock and soil that migrate into homes through VI in a similar fashion to VOCs. This project focused on the performance of permanent versus temporary sub-slab sampling ports for the determination of VI of halogenated VOCs and radon into an unoccupied house. VOC and radon concentrations measured simultaneously in soil gas using collocated temporary and permanent ports appeared to be independent of the type of port. The variability between collocated temporary and permanent ports was much less than the spatial variability between different locations within a single residential duplex. The agreement of the majority of VOC and radon concentrations, 0-36% relative percent difference, and 2-19% relative standard deviation respectively, of each sub-slab port (SSP) type was achieved even though the clay portion of the seal of the temporary ports was visibly desiccated and cracked. Post sampling leak test results suggested that the temporary SSP desiccation and cracking were not as detrimental to the port seal performance as would have been expected, this suggests that the Teflon tape portion of the seals served an important function. Post sampling leak tests are advisable (in addition to pre-sampling leak tests) when temporary ports are used to collect a time-integrated sample over a period of several hours. These results suggest that temporary sub-slab sampling ports can provide data equivalent to that collected from a permanent sub-slab sampling port. However, (1) only one type of seal material was tested in one location, (2) the seals were installed by experts with rigorous quality control, and; thus, (3) these results may not apply to all types of temporary seals and all building foundations.

中文翻译：

---

临时与永久子平板端口：比较性能研究。

蒸气侵入（VI）是地下蒸气（包括ra和挥发性有机化合物（VOC））从地下向室内空气的迁移。VI暴露途径从污染物源延伸到室内空气暴露点，污染物源可能是受污染的土壤，非水相液体或受污染的地下水。因此，被污染的基质可能包括地下水，土壤，土壤气体和室内空气。令人关注的VOC污染物通常包括卤化溶剂，例如三氯乙烯，四氯乙烯和氯仿，以及石油烃，例如芳香族VOC苯，甲苯和二甲苯。on是一种无色的放射性气体，它是由岩石和土壤中放射性核素的放射性衰变释放的，这些放射性核素通过挥发性有机物以类似于挥发性有机化合物的方式通过VI迁移到房屋中。该项目侧重于确定永久性和临时性子板取样端口的性能，用于确定卤化挥发性有机化合物和ra进入无人居住房屋的VI。使用并置的临时和永久端口在土壤气体中同时测量的VOC和ra浓度似乎与端口类型无关。并置的临时端口和永久端口之间的可变性远小于单个住宅复式房屋中不同位置之间的空间可变性。即使密封件的黏土部分被密封，每种VOC和ra的大部分浓度，每种子平板端口（SSP）的大多数VOC和ra浓度，相对百分比差分别为0-36％和相对标准偏差为2-19％都已达成一致。临时港口明显干燥并破裂。采样后的泄漏测试结果表明，临时的SSP干燥和开裂对端口密封性能的影响不如预期的那样，这表明密封的特氟龙胶带部分起着重要的作用。当使用临时端口在几个小时内收集时间积分的样本时，建议进行采样后泄漏测试（除了采样前泄漏测试）。这些结果表明，临时子板采样端口可以提供与从永久子板采样端口收集的数据等效的数据。但是，（1）在一个位置只测试了一种密封材料；（2）密封是由经过严格质量控制的专家安装的；以及 因此，（3）这些结果可能不适用于所有类型的临时密封件和所有建筑地基。