Wet Cake Remedial Action Plan
One of many challenges to remediate the AltEn site in 2021 was the need to develop and implement a remedial action plan (RAP) to address wet cake and other solids at the site. Since then, the AltEn Facilities Response Group (FRG) has worked to remove chemicals, debris, trash, and other materials from the site. Following a successful pilot study to determine the best approach, a total of 165,367 tons (7,293 truckloads) of wet cake was removed from the site, with transportation and disposal completed in August 2025.
Wet Cake Remedial Action Plan Overview
The FRG submitted the Wet Cake Remedial Action Plan (RAP) to NDWEE on August 23, 2024. The Wet Cake RAP recommended:
- Solidifying the wet cake on-site so that it could be safely loaded into trucks and transported off-site
- Transporting the solidified wet cake to and disposing of it in a landfill permitted by NDWEE to receive this material.
The RAP contained important environmental protection measures that were implemented during the remedial action, including stormwater management, dust control, odor control, air quality monitoring, truck lining, truck tire washing, truck inspections, and road cleaning.
The plan also included a schedule of activities with an anticipated completion date by the end of 2025. The work was completed ahead of schedule in August 2025, with all wet cake removed from the site. The location of the former wet cake pile will be graded and restored by mid-2026. The FRG will continue monitoring the site for environmental receptors.