Oxidation Pond Closure


Project Value: $12 Million


Cap and Title 27 closure for a former 66-acre oxidation pond system. At the time, this was the largest active Title 27 Closure project in the United States.

  • Remediation
  • Grading
  • Paving
  • Underground
  • Earthmoving
  • Soil mixing


We needed to solidify and stabilize F037 waste sediments in large inaccessible pond cells to suspend contaminants as well as create usable area for the facility owner. Twenty acres were designed as a “floating cap” where only the top three feet of sediment were stabilized and encapsulated the remaining sediment below. 


We designed direct pneumatic delivery and placement of Portland Cement and Fly-ash to cells and direct placed soil amendments. This eliminated the need for on-site silo storage and secondary delivery operations of cementitious materials. We used GPS guided equipment to grade and place subgrade and finish surface of aggregate base rock, reducing the personnel required for the task.

Project Success

We completed the closure ahead of schedule and under budget. Our innovative approach resulted in a client cost savings of over $2.5 million and reduced risk exposure.