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Coal Tar Stabilization Project
Southeastern PA In January of 2003 Enviro-Air Technologies, Inc. was contracted to stabilize approximately 1400 cubic yards of coal tar sludge that was contained in a quarry. The sludge depth ranged from 3-9 feet. The stabilization design called for the addition of Type III Portland cement at a rate of 20% by weight of the sludge. Enviro-Air utilized a 65,000 pound excavator with a specialized mixing head to mix the Portland cement with the sludge. The mixing head provided a uniform mixing between the sludge and the cement. The sludge was contained in a quarry that only had access at one area and there were no banks surrounding the lagoon. Over 100,000 gallons of water had to be removed from the surface of the lagoon prior to the stabilization activities. As a result Enviro-Air had to work off of the stabilized sludge and move across the lagoon. The average daily temperature during the stabilization activities was 18 degrees Fahrenheit. The project took ten working days from mobilization to demobilization. After all of the sludge had been stabilized, the area was graded with a D-3 dozer and six inches of ¾" modified stone was brought in and leveled over the top of the stabilized lagoon. Level D personal protection was implemented once during the project due to elevated benzene levels. |
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