Pond Sediment Stabilization

Location: Former Refinery / Active Fuel Terminal in Colon, Panama
Project Value: $1.1 Million

 

LWR was contracted by a US Oil Company to provide proprietary equipment, testing and expertise to stabilize the contents of two API separator ponds.

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LWR was contracted by a US Oil Company to provide proprietary equipment, testing and expertise to stabilize the contents of two API separator ponds at a former refinery currently in use as a bulk fuel terminal located in a tropical rainforest.

Our crew began their work by excavating and transferring approximately 17,000 tons of lightly impacted soil and aggregate from several locations within the facility to the pond area. These materials included dredge spoils from a stormwater canal, impacted tank berm soils and other impacted soils from various other locations that were utilized for construction of access ramps and temporary berms within the ponds during dewatering and excavation activities. These materials were eventually blended with soft pond sediment and reagent during the stabilization process to produce a recycled material suitable for future construction purposes. A total of approximately 22,000 cubic yards of oily sediment was removed from the ponds in order to meet closure criteria. Pond sediment, imported blending soils and a reagent admixture processed in LWR’s cold mix pugmill produced a total of approximately 38,000 tons of recycled product. All of the recycled product met project chemical and physical testing criteria prescribed by EPA and US Army Corps of Engineers documents without re-treatment.

Site conditions including the layout of the facility’s stormwater collection system, the extreme amount of rainwater that had to be handled and a plume of LNAPL flowing into the ponds from an unknown source provided special challenges on the project. LWR proposed and implemented field-designed modifications to the facility’s stormwater controls that diverted water routed to the project ponds to improvised oil/water separators and an alternative discharge point. LWR also designed and installed an LNAPL recovery trench that intercepted product flowing into the ponds and improved ongoing site product recovery efforts by an order of magnitude.