Cleanup Activities
| Start Date | EPA Funding | Completion Date | CA | Accomplishment Counted? | Cleanup Documentation |
|---|
| 10/01/2012 | | 08/25/2014 | Clinton County | Yes | |
Cleanup/Treatment Implemented:
N
Cleanup/Treatement Categories:
Addl Cleanup/Treatment info:
Previous site investigations documented the presence of volatile organic compounds (VOCs), including chlorinated solvents, in soil and groundwater samples collected from the beneath the subject building at concentrations exceeding the State's Residential and Nonresidential Volatilization to Indoor Air Pathway (VIAP) screening levels, representing a vapor intrusion (VI) condition and indicates that potential contaminant inhalation exposures may exist for building occupants. Mitigation is required in the form of sub-slab depressurization (SSD), a method that depressurizes the atmosphere beneath the concrete slab of a building to maintain a greater pressure within the subject building that prevent soil gas from entering the structure, while venting soil gas to the exterior air.
Therefore, a constructability survey to evaluate the feasibility of employing a SSD system at the subject property was conducted which included identifying specific site features such as floor elevations, floor condition, building additions, drainage, and other slab features, as they relate to the process of depressurizing the atmosphere beneath the concrete slab during SSD system operation. In addition, a limited GPR survey within the subject building to clear the proposed extraction point locations of subsurface utilities and to identify potential subsurface impediments beneath the concrete floor slab that would prevent or complicate applying and maintaining a
vacuum field using a SSD system was conducted.
Based on the findings of the constructability survey and limited GPR activities discussed above, an SSD system pilot test is recommended to further evaluate the feasibility and effectiveness of employing SSD for vapor mitigation, and to provide a basis for SSD system design and specifications in accordance with EGLE's May 2013 Guidance for the Vapor Intrusion Pathway.
Address of Data Source:
Total ACRES Cleaned Up: 10.2
Number of Cleanup Jobs Leveraged:
EPA Cleanup Funding:
Leveraged Funding: $1,000,000.00
Cost Share Funding:
Total Funding: $1,000,000.00
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