CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY > SUBPART E—Primary Electrolytic Copper Refining Subcategory (§421.50 to §421.57) > 421.52—Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

421.52—Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):
Effluent Limitations
Effluent characteristic Maximum for any 1 day Average of Daily values for 30 consecutive days shall not exceed
(Metric units, kg/kkg of product; English units, pounds per 1,000 lb of product)
Total suspended solids 0.100 0.050
Copper 0.0017 0.0008
Cadmium 0.00006 0.00003
Lead 0.0006 0.0026
Zinc 0.0012 0.0003
pH (1) (1)
1 Within the range of 6.0 to 9.0.