Clark Environmental, Inc.

The likely sources of the contaminated soil which will be managed and treated by the CLARK Thermal Treatment facility include:

Petroleum contaminated soil
Petroleum tank bottom sludges from petroleum storage tank systems
Petroleum contaminated sediments, sludges, and liquids which originate from oil/water separators at residential car washes, rollover car washes, and tunnel car washes.
Petroleum contaminated sediments, sludges, and liquids which originate from oil/water separators/sumps, other than car washes.
Soils contaminated with non-hazardous coal tar pitch residuals.
Soils contaminated with non-hazardous creosote

Once the soil has met all of the acceptance requirements, it may be treated by the Thermal Treatment Facility. The loader operator will transfer the soil from the Contaminated Soil Area to the Feed Hopper. The soil travels from the Feed Hopper on the Transfer Conveyor, and then dumps onto a 4' x 10' Shaker Screen deck where 2" and smaller material continues on the Charging Conveyor toward the Desorber Drum.

Anything greater than 2" falls onto the Reject Conveyor, and then falls off to the side. The greater than 2" debris is removed by a loader operator, and transferred to the Debris Area. The debris will be disposed at a Class I Landfill.

The 2" and smaller material travels on the Charging Conveyor, is weighed, and then deposits onto the Slinger Feeder that goes into the Desorber Drum. Inside the Desorber Drum, the soil first travels through the Drying Zone, creating a curtain of soil to retain as much of the heat inside the drum as possible. The soil then travels through the Heating Zone, which continues to increase the temperature of the soil. And lastly, the soil travels through the Combustion Zone of the Desorber Drum, which brings the soil up to the required temperatures for proper and thorough treatment.

The treated soil travels to the Soil Conditioner where the soil is re-hydrated reducing the soil's temperature for safe handling. The soil then travels on the Discharge Conveyor where it falls into a pile. A second loader operator moves the treated soil to one of the Treated Soil Bays in Building #5 to await results of the post-burn sampling.

Once the soil has passed post-burn analytical requirements, the loader operator transfers the cleaned soil to the Cleaned Soil Area on the east and northeast side of the Thermal Treatment Building.

The exhaust fan, driven by two 150 hp motors, powers the flow of air through the entire Thermal Treatment Facility.

Air is pulled from the Desorber Burner into the horizontal Cyclone at approximately 400º F. The flow of air is then pulled into the Oxidizer, which heats the air stream up to a minimum of 1500º F at a 1.5 second dwell. Next, the air is pulled into the parallel Heat Exchangers, which will cool the air stream back down to approximately 350º F. The air stream then proceeds through the Baghouse to filter any remaining particulates out of the air stream. The clean air exhausts out of the stack.

Dust Return Augers provide a method for collecting dust from the air flow side of the Thermal Treatment Plant, and returning the dust to the soil flow side of the Thermal Treatment Plant. The Dust Return Auger from the Cyclone returns the dust that may not have been thoroughly treated, back to the Desorber Drum collar for re-treatment. This is a patented process only found on the Tarmac plants! The Dust Return Augers take the dust, which was further treated by the higher temperatures in the Oxidizer, from the Oxidizer and Baghouse, and returns the treated dust to the Soil Conditioner.

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