Sub-slab Depressurization System Installation

Designed and installed an active sub-slab depressurization system (SSDS).

June 23, 2022

Overview

problem statement

High concentrations of VOCs from a former gas station presented a possible pathway to contaminate indoor air in an operating business.

target contaminants

Petroleum VOCs

location

Brighton, MI

Equipment

Sub-slab depressurization system to mitigate vapor intrusion
extraction trench and vapor recovery fans

Solution

Global Treatment Solutions was contracted to design and install an active sub-slab depressurization system (SSDS) in an approximately 2,100-square-foot residential/commercial building located in Southeast Michigan. As a result of a Phase II Environmental Site Investigation, soil and groundwater samples collected from the site documented concentrations of petroleum VOCs exceeding EGLE’s Volatilization to Indoor Air Pathway (VIAP) Screening Levels. Global installed an SSDS, which included a total of two VOC extraction fans, four vertical extraction points, and two 15-foot runs of vapor collection material to mitigate potential vapors from entering the basement of the building. Additionally, Global installed eight sub-slab soil gas points to monitor the SSDS performance and has proposed routine monitoring to document system performance.

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