RESULTS

Process Wastes
K061 is an EPA regulated waste by-product from the primary production of steel in electric furnaces. K061 can contain a variety of heavy metals including lead, cadmium and chrome. Depending on the specific process, waste K061 may also contain elevated levels of zinc, copper, and other metals that can interfere or render pozzolonic or ion specific stabilization methods ineffective. ADT was requested to conduct treatability studies on K061 waste from a steel mill and containing high levels of lead, cadmium, chrome, and zinc. Using treatment formulations that added only 2 percent to the original waste volume, ADT successfully reduced TCLP levels to below RCRA as well as below the more stringent land disposal restrictions for all metals of concern. This on site treatment process allows for off site disposal at considerably less cost.

Soil Contamination
During the 1990s, heavy metal concentrations have been identified in the Spokane River, which empties Lake Coeur d'Alene and leads to the salmon and trout spawning grounds of the Columbia River system. Following laboratory bench scale tests a stabilization method was identified for on-site confirmation of an in-situ technique that would not damage the River's banks. Specially formulated reagents were applied and testing revealing concentrations below EPA (LDR)

Waste Stockpiles and Sediments
An EPA superfund located northern California is typical of wood treating facilities that employed CCA (Copper-Chromium-Arsenate) formulations to reduce biological degradation and insect damage in structural and decorative timber. Concentrations of leachable arsenic in excess of RCRA clean up standards were identified in several areas of the plant including the upper 2- 3 feet of soil in the "drip-line" area; sediments collected in storm water settling basins and soils around and under the pressure retorts used to force treating solutions into the timber. ADT conducted on site treatment using costumed formulated bulk reagents adding less than 2 % original waste volume. Treated wastes were then permanently deposited in a specially designed cell on site.

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