Refinery Pond Stabilization / Reclamation

Location: Operating Oil Refinery in New Brunswick, Canada
Project Value: $4.5 Million

 

LWC was contracted to close a stormwater pond at a refinery that received effluent from process unit sewers in order to reclaim the ponds footprint for future construction.

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Lone Wolf Canada, ULC (LWC) was contracted to close a stormwater pond at an operating refinery that received effluent from process unit sewers in order to reclaim the ponds footprint for future construction. Pond sediment and underlying soil were heavily impacted with petroleum hydrocarbons and metals.

LWC collected representative samples of pond sediments and performed treatability testing to formulate an appropriate stabilization admixture recipe to recycle the impacted materials into a reusable fill material that met regulatory and geotechnical criteria. The initial mix design included additions of reagent and offsite borrow soils. After mobilization, the LWR Project Manager noticed a stockpile of waste soils in an area of the refinery property known as the Mud Dump. The waste soils included construction spoils and ditch sediments containing large amounts of debris. LWC performed additional testing with these materials and determined that they could be incorporated into the stabilization mixture after screening to remove oversized (>3-inch) debris. Use of the Mud Dump materials effectively cleared out the Mud Dump area for future use and eliminated the cost of importing offsite borrow materials.

During the course of the project LWC excavated and stabilized approximately 33,300 tons of impacted soils and sediments from the Pond B cleanout process. LWC also stabilized an additional 4,480 tons of impacted materials including impacted soils from other projects and refinery waste stored in over 200 rolloff bins. LWCs cold mix pugmill was utilized to mix impacted materials with approximately 70,000 tons of Mud Dump waste soils and a reagent admixture to produce approximately 113,000 tons of select fill material that was placed and compacted within the footprint of Pond B. The volume of recycled material created during the project was sufficient to completely fill the Pond B footprint creating an ideal foundation for future construction. Composite samples collected from each 1,500-ton Lot of recycled material produced during the project indicated that only one out of 75 Lots did not meet analytical and geotechnical criteria for the project and required re-stabilization.

LWC and its subcontractors worked over 25,000 manhours on this project without a single safety incident.