SECTION THREE
Construction Activities
CONSTRUCTION AND IMPLEMENTATION OF THE TREATMENT REMEDY
A background air monitoring study was performed prior to on-site construction activities. The
study was conducted from October 10 through December 5, 1994. The perimeter air monitoring
program was initiated in March 1995, and excavation began in April 1995. In order to support
the vertical excavation at the site boundaries, a sheet pile excavation support system was
installed to allow "straight cut" excavations. Soil excavation was the first step in incinerator
construction, and the unit was sited on imported clean fill placed after the initial excavation.
Construction of the incineration system was completed in December 1995. System shakedown
and a clean burn were conducted on January 13, 1996. The incinerator was then shut down until
September 23, 1996 due to a lawsuit that was filed by a local opposition group against the
USEPA to stop the remediation project. Approval to continue the project was issued on August
14, 1996.
A mobile, on-site incineration system was used to decontaminate soil, sludge, and sediment at
the SCS Site. The incineration system consisted of a rotary kiln, a secondary combustion
chamber (SCC), and an air pollution control system (APCS). Rotary kiln incinerators are able to
process a wide variety of waste feed compositions and handle oversized wastes with minimal
processing pre-treatment. The rotary kiln portion of the system is used to volatilize and destroy
the majority of the organic contaminants. The remaining organic contaminants exit the kiln with
the hot gases into the SCC where additional destruction occurs. The APCS is used to provide
particulate matter and acid gas control. Figure 2 shows a schematic of the on-site incineration
system.
Site characteristics, operating limits, and operating parameters of the incineration system are
presented in Appendix A. The system was operated using the following steps:
Contaminated soil was excavated down to the water table over the entire site and was dried
by adding cement kiln dust or lime. Soil was then transported to the debris separation
building. Material greater than 4 inches in diameter was removed from the soil by rotating
barrel screens and underwent manual segregation into organic and inorganic debris. Organic
debris (e.g., wood) was shredded. Inorganic debris was either landfilled (e.g., plastic),
recycled (e.g., steel) or cleaned for backfill (e.g., rocks). Material less than 4 inches in
diameter was stockpiled in the feed preparation building after ferrous material was
electromagnetically removed.
Soil was blended with shredded brush, roots, trees, and other combustible material. The soil
was fed onto a variable-speed, apron conveyor, a weigh belt conveyor, and into the kiln feed
hopper. Feed material was delivered from the hopper to the kiln via dual, water-cooled, feed
screws. The feed material was sampled and analyzed for metals, SVOCs (including β -
naphthylamine), VOCs, Fenac, and physical/chemical parameters (e.g., BTU, moisture, ash,
and chlorine).
The rotary kiln was 60 feet long and had an inside diameter of 11 feet. The kiln was operated
concurrently with the waste feed located at the same end as the oxygen-natural gas burners.
3-1
Slippery Chemical OU 3 Final RA Report
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