Project Features:
- Superfund site remediation with USACOE and EPA oversight/involvement
- Stabilization of 18,000 CY of contaminated soils
Background:
Geo-Solutions was subcontracted to complete the specialty geotechnical construction portions of the American Creosote Works (ACW) Superfund site remediation in Louisville, Mississippi. Geo-Solutions’ work components included the installation of a soil-bentonite slurry trench barrier wall and shallow stabilization of contaminated soils. The barrier wall was installed to a depth of 60 feet BGS. The slurry trench barrier wall installation was completed with a Komatsu PC800 excavator fitted with a specialty long stick. The shallow stabilization was performed with Portland cement to a depth of 3 to 4 feet BGS. The shallow stabilization was performed using excavator bucket mixing.
Project Objectives:
- SB barrier wall permeability less than or equal to 1×10-7 cm/s
- Stabilized material UCS greater than 100 psi
Description of Work:
- Installation of 190,000 VSF soil-bentonite barrier wall
- Maximum depth of 60 feet BGS, Average perm = 5×10-8 cm/s
- Work completed over 22 weeks
- Stabilization of 18,000 CYs of contaminated soils
- Maximum depth of 3 to 4 feet BGS, Average UCS of 130 psi
- Work completed over 11 weeks
Project Challenges:
- Achieving a well-mixed soil-reagent composite in a soft, plastic clay
- Installing the barrier wall on a soft work platform – significant rain, spongy swamp soils
