Abs: Active soil gas methods consist of the withdrawal and analysis of the soil gas from the subsurface. These methods give concentration data (for example, μg/m3) for COCs, which can be directly compared to risk-based screening levels or used in predictive models… Continue reading
Abs: The site investigation phase starts with implementing a concentration-based evaluation using existing data. If necessary, the next step involves conducting a PVI investigation. Data evaluation is followed to determines whether additional investigation is warranted. Finally, a conclusion on the completeness of the PVI pathway must be made… Continue reading
摘要：场地调查阶段首先需要借助现有的数据进行基于浓度的初步筛查，根据筛查结果进行石油蒸汽侵入调查。调查过程中采集的数据需要进一步评估，从而决定是否需要更细致的场地调查。最后得出关于石油蒸汽侵入途径的一个完整结论。… Continue reading
ABS：This chapter describes a method for PVI screening based on the vertical distance from a petroleum vapor source to a building foundation (vertical separation distance). Application of the method is expected to improve PVI screening and reduce unnecessary data collection at numerous petroleum release sites.
Abs: Vapor Intrusion (VI) occurs when vapors from contaminated groundwater or other subsurface sources migrate upward through vadose zone soils and into overlying buildings. While PVI has similarities to chlorinated vapor intrusion (CVI), recent research and analysis has increased the understanding of the significant differences between PVI and CVI. Vapor Intrusion (VI) occurs when vapors … Continue reading
This article describes various sampling and analysis methods available for vapor intrusion investigations. This information will help with select the techniques that will best meet the data objectives… Continue reading
Abs: This chapter explains how to evaluate and select a strategy for mitigating PVI, as well as how to identify metrics for performance and closure strategies. PVI can be managed by environmental remediation, institutional controls (ICs), building mitigation, or any combination of these approaches. Traditional remedial technologies applied to the source may be sufficient to … Continue reading
Abs: ITRC’s 2007 guidance document, Vapor Intrusion Pathway: A Practical Guideline, primarily focused on chlorinated vapor intrusion (CVI). However, the focus of PVI document is petroleum vapor intrusion (PVI), a subset of vapor intrusion. Vapors from petroleum hydrocarbons rapidly biodegrade as they migrate through unsaturated, vadose-zone soils, greatly limiting the potential for the PVI pathway … Continue reading
Abs: Building control technologies are typically required at VI sites (in both existing and new buildings)until long-term, site-wide remedies reduce soil and groundwater concentrations to acceptable levels. The following sections discuss various VI building control technologies, factors affecting technology selection, and common design and installation issues. Vapor control for VOCs can include environmental remediation, building … Continue reading
Light, nonaqueous-phase liquid (LNAPL) management (LNAPL assessment and remediation) presents some of the greatest corrective action and cleanup compliance challenges to petroleum manufacturing, storage, and handling facilities such as refineries, bulk product terminals, gas stations, airports, and military bases The management of LNAPL requires to first identify the specific LNAPL composition and saturation concerns the … Continue reading
