Question # 262

262. Regarding non-PBT metals in mixtures, such as chromium in an alloy (stainless steel), how are thresholds and releases and other waste management activities accounted for in a foundry type operation where all of the metals are melted down? Could the de minimis and article exemptions be applied?
For threshold purposes, if the listed non-PBT chemicals in the metals are processed, otherwise used, manufactured as an impurity (that remains with the product), or imported below the de minimis levels, then the de minimis exemption may be taken for that metal in the alloy. However, the article exemption cannot be taken for this type of foundry operation since in founding, a metal is melted down and poured into a mold. Consequently, the resulting metal is not recognizable as its original form.