Our confidential client engaged SCS Engineers and SCS Field Services, our construction and O&M divisions, to perform the remedial engineering design and construction of a 3.7-acre site requiring soil stabilization where a waste water lagoon once existed.
The excavation contained 27,000 tons of soil impacted with cadmium concentrations
greater than 1 milligram per liter (mg/L). Soils with these concentrations are subject to RCRA standards. Therefore, these soils were stabilized in-place using Portland cement to render them non-hazardous for disposal at a local landfill. The Portland cement was placed in thin lifts and blended with road stabilizer. The remedial construction for the site included the following activities:
- Design, specifications and workplans
- Health and safety monitoring
- Permits from the city, flood control, county and state
- Install stormwater best management practices
- Demolish and remove above ground structures from the excavation area
- Recycle asphalt in the excavation area
- Remove base-rock and other potential base materials
- Remove and dispose of soils containing non-hazardous concentrations of cadmium at concentrations greater than 40 milligrams per kilogram (mg/kg)
- Dewatering
- Confirmation sampling and analysis
- Air monitoring
- Stabilizing soils containing hazardous levels of cadmium using Portland cement prior to removal and disposal
- Stockpile or direct load soil
- Transport and dispose of excavated soil
- Import 27,000 tons of clean material
- Backfill, grade and compact excavation area
