Location: Northeastern Georgia
Client: Major Power Transmission Company
Contract Amount: $113,000
7,000 gallons of mineral oil were released when a 230 KV
transformer exploded at a power substation. Mineral oil
migrated off the substation pad, through a rock filled detention
pond and down a heavily vegetated drainage ditch that ended
up in a depressed area 550 feet from the transformer pad (on
the power line ROW). The impact area was determined to be
10,400 square feet by performing a GPS survey.
350-gallons of oil were recovered using Remtech’s all-terrain
vacuum tankers inside the substation’s fenced downgradient
section. Recovered oil was transported to a recycling facility.
The concrete transformer pad and power line footings were
cleaned with HC-2000 enhanced bioremediation accelerant/
cleaner and pressure washed with water.
Oil saturated soils were excavated from: the transformer area
inside the fence above grounding grids, access road, rock
filled detention pond, and drainage ditch. 280-tons of
contaminated soils transported to a Subtitle D Landfill facility
as a special waste.
The State of Georgia approved soil treatment of contaminated
soil in and beneath the grounding grid and downgradient
residual runoff soils with three (3) applications of Remtech’s
bioremediation accelerator HC-2000 without performance
sampling based on successful degradation sampling on
Remtech designed and constructed a new detention pond with
an oil recovery cell employing an inground API separator and
entrance and discharge hydraulic energy dissipators. The site
was landscaped with soil stabilization systems consisting of
gravel inside the fence, riprap, geotechnical fabric, and
wetlands mix seed germination netting outside the fence.
The insitu treatment of 0.23 acres of the mineral oil
contaminated soils in and beneath the substation’s grounding
grid and spill runoff area with HC-2000 rather than excavation
saved the client an estimated $100,000 and minimized
extended power outages that would have been associated with
removal and replacement of the substation’s grounding grid.