Louisville, MS: Slurry Wall Installation, American Creosote Works Superfund Site

Louisville, MS: Slurry Wall Installation, American Creosote Works Superfund Site

Project Description

services-slurry-soil-bentonite-louisville2-msProject 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

services-slurry-soil-bentonite-louisville1-msDescription 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