Last month, we发言语蒸汽侵入的可能性以及蒸汽侵入的调查和减轻;有机蒸汽的可能性，进入居民，商业或工业空间，具有不良人体健康影响。通过控制室内空间内部或下方的环境条件来修复这些有机蒸汽的来源或减轻曝光潜力可以是工程挑战。
The factors that go into the best solution include, but are not limited to:
- 新与现有建筑
- 污染物的实际来源和质量
- 一个人试图影响的媒体（例如，土壤，地下水，土壤蒸汽）
- 正在解决的结构的大小
- 年龄
- 建筑建筑材料
- 设计和建筑HVAC控制
一旦通过适当的工程和科学调查建立了蒸汽侵入的可能性（受到他们存在的要求或指导的影响），必须组装有关结构的信息，或者部分结构，然后设计和价值 -工程师一个符合几个可能竞争目标的解决方案。
我们的顾问一直在执行这项工作超过25年，虽然许多州在过去十年之前没有出版指导，但如果有的话。我们的作品从大型工业制造设施，商业建筑，办公大楼，带式商场，小型一层办公楼，到多家和单户主的家庭。蒸气侵入的潜力和现实不仅与旧工业设施相关联。
Mitigation of actual or perceived vapor intrusion (it is not easy to absolutely know that vapors are entering a structure) is not the same as remediation of the source of those vapors. Sometimes it is acceptable, from a regulatory standpoint, to leave the source where it is. This may seem contradictory to environmental laws but is consistent with risk-based site cleanups which are acceptable at the federal and most state levels. Remediation will remove or destroy the source contaminants, where mitigation simply controls the exposure pathway. In the case of vapor intrusion, the main mitigation objective is to keep the vapors from entering an occupied space where inhalation exposure can lead to human health consequences.
If one can reasonably remediate the source of the vapors, or if you are a responsible party and required to do so, then remediation and mitigation may be the same. Although still costly, mitigation is usually less expensive and time-consuming than remediating the source of vapors. Typical capital or up-front costs for vapor mitigation systems can range from $2.00 to $6.00/ft2of the ground level square footage of the structure. You may be required to have an environmental covenant or property deed restrictions on the property and may have to perform on-going monitoring and reporting.
As we briefly discussed last month, there are well-proven ways to mitigate vapor intrusion. While at first glance it may seem as simple as modifying a building’s HVAC system so that the building is always “pressurized” (and therefore, does not allow the vapors to enter into the building through maintenance of a pressure gradient), this method will likely prove to be impractical and costly.
Sealing a building’s floors, walls, sumps, utility corridors, or other direct pathways from underlying soils into a building also seems like an inexpensive mitigation step but can be hard to accomplish. It is comparable to sealing against water intrusion in basements constructed in saturated soils – a losing battle against Mother Nature.
So,depressurization或者通风建筑物下方的“子板”空间是各种结构蒸汽缓解的主要选择。典型的子板式减压系统（SSD）非常像您在家中可能拥有的氡系统。子平板通风系统（SSV）与SSD有点不同，因为它们通常包括将新鲜空气引入的子平板空间，这导致能够降低能量成本以提供缓解保护。
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