- Solids pretreated with shredding, screening, and mixing with cement kiln dust
- Incineration system consisting of rotary kiln and secondary combustion chamber (SCC)
- Enclosed conveyor transported contaminated soil and debris to the unit
- Kiln temperature of 1,425°F, SCC temperature of 2,091°F
- Treated soil and debris (incinerator ash) discharged onto conveyors and taken to an ash storage area
CERCLA and State: Arkansas
- ROD Date: 3/24/88
2491 (Wood Preserving)
|Points of Contact:|
U.S. EPA Region 6
1445 Ross Avenue
Dallas, TX 75202
State of Arkansas
Department of Pollution Control
P.O. Box 8913
Little Rock, AR 72219
Pentachlorophenol and polynuclear aromatic hydrocarbons, and VOCs
- Benzo(a)anthracene, benzo(a)pyrene, benzo(k)fluoranthene, chrysene, fluoranthene, 2-methyl naphthalene, phenanthrene, benzene, toluene, trichloroethylene, xylene, and chloroform.
- PCP concentrations up to 5,900 mg/kg and PAH concentrations up to 38,000 mg/kg
Disposal lagoons - wood preserving waste
Type/Quantity of Media Treated:
Sludge and Soil
- 102,000 tons of sludge and soil
- Moisture content: sludge - 43.6
Purpose/Significance of Application:
Initially, dioxins and furans were believed to be present in the soil. Later, concentrations of dioxins and furans were determined to be very low and none were in the form of 2,3,7,8-TCDD.
Regulatory Requirements/Cleanup Goals:
Destruction and Removal Efficiency (DRE) of 99.9999% for all constituents of concern as required by Resource Conservation and Recovery Act (RCRA) incinerator regulations in 40 CFR part 264, subpart O.
- Monitoring and trial burn data indicate that all DRE and emission standards have been met
- Analytical data of residuals indicate that cleanup goals have been met
Between 1969 and 1979, the site operated as a wood preserving plant. Effluents from the treatment process containing PCP and PAHs were discharged to seven on-site lagoons. A series of inspections at the site were performed by the Arkansas Department of Pollution Control and Ecology and the U.S. EPA between 1981 and 1986. A Record of Decision (ROD) was signed March 1988, specified on-site incineration as the remedial technology for the sludge, soil, and sediments. Site cleanup goals and DRE standards were specified for constituents of concern.
On-site incineration began in June 1992 and was completed in May 1993. The treatment system consisted of a rotary kiln and an SCC. An enclosed conveyor moved the soil and debris to the kiln for treatment. Treated ash from the incinerator was discharged to a conveyor and conveyed to a collection area. During its period of operation, the incinerator processed 102,000 tons of sludge and soil. Incineration achieved the soil cleanup goals specified in the ROD.