Stewart Environmental Consultants, Inc. and AAA Plating of Denver, Colorado, have successfully delisted AAA's F006/F019 listed hazardous waste. When AAA Plating moved into their new facility in 1997, several changes were made to meet the intent of the Strategic Goals Program of the Co on Sense Initiative. Part of this program was to eliminate as much of the hazardous waste as possible at the facility. The first step was to separate the two major wastewater streams, zinc-containing and chromium-containing wastes. Zinc sludge is exempt under 40 CFR 261 and thus reduced the amount of hazardous waste from the facility by over 50 percent. The sludge derived from the chromium-containing wastewater was listed as an F006/F019 hazardous waste. The delisting process took 12 months to satisfy regulators that the heavy metals in the sludge were not available to the environment. In June 2000, this material was successfully delisted by the Colorado Department of Public Health and Environment. This paper will discuss this process, what was learned from the process, and what parameters need to be reviewed as an ongoing responsibility in the future.
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