Peak Oil Superfund Site, Tampa
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The Peak Oil Superfund site is situated within a derelict industrial area of wetland. The former waste oil recycling plant site covered 15.5 acres and was contaminated with waste oil products, including PCBs and trichloroethylene. Lead was also present on the site. As a result of a previous remediation attempt (infrared heat treatment), a stockpile of contaminated ash was also present. The geology of the area was of variable drift and included sand, silt, clay, and peat. The area had a shallow water table with a low hydraulic gradient to the west.
Solidification/stabilization remediation treatment began in September
2000 and was completed in 2001, with an estimated 24,000 tons of
material treated.
The site investigations involved traditional drilling methods and the use of a laser-induced fluorescence sensor. The "cutlines" sampling strategy was adapted here, and the site was divided into a grid of 12-meter (35-foot) squares with five sampling locations in each.
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| Pugmill mixing equipment at Peak Oil Superfund site. |
The treatment method at this site by Remedial Construction Services involved excavation of contaminated soil and backfilling the void to a height of 0.2 to 0.3 meters (8 to 12 inchs above the water table with clean soil. The excavated oil-contaminated soil and ash were blended together and treated with trisodium phosphate granules to further immobilize the lead. The material was then screened and fed to a pugmill where it was mixed with the cement binder formulation. The treated material was transported to the excavated area, bladed, and compacted in 0.3 meter (1 foot) layers. Remedial targets were set and compliance sampling took place at a rate of 1 in 90 tons, or 1 per day. Environmental monitoring at the site involved real-time and averaged pumped sampling for respirable dust, toxic metals, total VOCs, and pesticides.
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