mg/off-kg (lb/million off-ibs) of aluminum cleaned or etched mg/off-kg (lb/million off-lbs) of aluminum drawn with emut Chromium 0.205 0.084 0.056 0.285 1.49 0.070 0.038 0.196 1.27 4.67 5.60 (1) Chromium 0.173 Cyanide 0.094 Zinc 0.476 Aluminum 2.85 Oil and grease 4.67 Suspended solids 7.00 PH (") Within the range of 7.0 to 10.0 at all times. mg/off-kg (lb/million off-lbs) of Chromium 0.079 0.032 0.022 0.11 0.57 Chromium 0.0009 0.0006 0.0029 0.0014 0.079 0.052 0.262 0.124 0.032 0.022 0.11 Chromium toring parameter) 0.10 monitoring parameter) 0.052 8 467.66 Pretreatment standards for new sources. Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in aluminum forming process wastewaters introduced into a POTW shall not exceed the values set forth below: Chromium monitoring parameter) mg/off-kg (lb/million off-Ibs) of aluminum rod cast 0.072 0.039 0.198 0.134 0.029 0.016 0.082 1.94 1.94 |