In Situ Solidification/Stabilization (ISS) can be achieved using a variety of methods including single vertical auger mixing, multi-auger vertical mixing, mixing with specialty tools (such as the Lang Dual Axis Remediation Blender), backhoe mixing, and jet grouting. Vertical auger mixing (VAM) generally involves hollow stem augers with mixing heads between 3 and 12 feet in diameter. Ex Situ Solidification/Stabilization (ESS) can also be performed using a variety of methods including back hoe mixing in place or in tanks or containers; pugmill mixing; or treatment in lay down areas using discs or soil stabilizers. Back hoe mixing is the simplest and most commonly used method when treatment objectives are relatively simple and readily achieved. When soil or waste characteristics are more complex and a higher degree of performance certainty and process control are required, pugmill or treatment pad mixing are more commonly used. We own automated batch plants for optimum efficiency and high volume grout preparation. Great Lakes E&I has the experience to help clients evaluate the methodologies that will best meet their project objectives.



  • In Situ mixing of impacted clay soils 28 feet below land surface with sodium permanganate 
  • Installation of an engineered excavation and support structure supporting excavation up to 28 feet below land surface
  • Installation and operation of dewatering and treatment system

Great Lakes E&I was contracted to treat soils within a chlorinated hydrocarbon PCLE Zone to the top of bedrock (approximate depth of 28 feet below land surface) using In Situ soil mixing with sodium permanganate injection to oxidize the contaminants with the underlying ground water plume. The treatment was completed with a RH-20 Delmag Rig turning a 6 feet auger attachment to inject and mix the sodium permanganate into impacted soils. The treated soils were excavated and disposed of at a Class 2 disposal facility.  Following the excavation of treated soils the area was back-filled with select fill. Additional features of work included asphalt removal/haul off and resurfacing, installation of an excavation support structure and dewatering and treatment system with the ability to support excavation of 28 ft below land surface, and excavation/haul off and backfill of cadmium impacted areas and chlorinated hydrocarbon PCLE area.



  • Wetland Project Setting
  • In Situ Soil Stabilization
  • Construction of 10,624 lf of composite slurry wall to a depth of 38 feet
  • Excavation of RCRA SWMUs
  • Consolidation Area Placement
  • Quarry and Borrow Area Development
  • Access Road Construction
  • Site Grading and SWPP BMPs
  • Onsite Crushing Operations
  • Recycling of packaged materials and unused HDPE Sheetpiles

​​This multi-faceted remediation project was conducted at an active chemical plant in Utah. The scope of work included: the development and reactivation of an on-site quarry to produce rock needed for berm and barrier wall platform construction, In Situ soil stabilization to support barrier wall platform construction and improve seismic stability, barrier wall work pad construction, soil-sepiolite slurry wall construction, HDPE sheet pile installation, and final dike construction and rock slope protection. The project also included remediation of two RCRA Solid Waste Management Units (SWMUs) and placement of excavated material in an on-site consolidation area.