Former Dry Cleaning Facility
Low Temperature Evaporative Desorption Technology (EDT)
Reterro EDT was selected as the remedial alternative to treat 1,800 tons of chlorinated volatile organic compound (CVOC) contaminated soil at a former dry cleaning facility in Union City, California
An air discharge permit was obtained from the Bay Area Air Quality Management District, which allowed operation of the flameless evaporative desorption ex situ thermal treatment unit. Impacted soil consisted of Bay Mud, a fine-grained soil resistant to soil treatment methods. The soils targeted for treatment were in both the vadose zone and below the water table.
Reterro mobilized one EDT system to the site i and commenced evaporative desorption soil processing, with a goal of completing the project within 45 days. Soil treatment goals were set one order of magnitude lower than environmental screening levels, and soil sampling of treated materials confirmed that the evaporative desorption process achieved those goals. Evaporative desorption processing of saturated Bay Mud materials provided an early site challenge that was addressed through real-time process engineering optimization.
Contaminants of concern: Chlorinated Volatile Organic Carbons (CVOCs)
Soil: Clay and silt (Bay Mud)
Excavation depth: 10 feet
Groundwater depth: 5 feet
Project size: 1,800 tons
Proximity to residential properties created emission and sound limitations
Low temperature EDT effective
Quiet and zero-emission
Zero reportable safety incidents
Subcontractor: Reterro, Inc.
Regulatory oversight: Alameda County Department of Environmental Health