Land Disposal Restrictions: Granting of Two Site-Specific Treatment Variances to U.S. Ecology Idaho, Incorporated in Grandview, Idaho and CWM Chemical Services, LLC in Model City, New York

The Environmental Protection Agency (EPA or Agency) is promulgating two site-specific treatment variances from the Land Disposal Restrictions (LDR) standards for wastes generated at U.S. Ecology Idaho, Incorporated (USEII) in Grandview, Idaho, and CWM Chemical Services, LLC (CWM) in Model City, New York. These waste streams are derived from the treatment of multiple listed and characteristic hazardous wastes, including K088 (spent potliners from primary aluminum reduction), and differ significantly from the waste used to establish the LDR treatment standard for arsenic in K088 non- wastewaters. Accordingly, we are finalizing an alternate treatment standard of 5.0 mg/l for arsenic, measured using the Toxicity Characteristic Leaching Procedure (TCLP), for the K088 derived emission control dust from the USEII facility. We are also, for the CWM facility, finalizing an alternate treatment standard of 5.0 mg/l for arsenic, measured using the Toxicity Characteristic Leaching Procedure, for the K088 derived baghouse dust, incinerator ash, and filtercake. This treatment variance requires USEII and CWM to dispose of their respective waste in RCRA Subtitle C landfills provided the waste complies with the specified alternate treatment standard for arsenic in K088 non-wastewaters and meets all other applicable LDR treatment standards.