[Code of Federal Regulations] [Title 40, Volume 28] [Revised as of July 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR471.91] [Page 779-782] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 471_NONFERROUS METALS FORMING AND METAL POWDERS POINT SOURCE CATEGORY --Table of Contents Subpart I_Zirconium-Hafnium Forming Subcategory Sec. 471.91 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT). Except as provided in 40 CFR 125.30 through 125.32, any existing point [[Page 780]] source subject to this subpart must achieve the following effluent limitations for the process operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT): (a) Rolling spent neat oils--Subpart I--BPT. There shall be no discharge of process wastewater pollutants. (b) Drawing spent lubricants--Subpart I--BPT. There shall be no discharge of process wastewater pollutants. (c) Extrusion spend emulsions--Subpart I--BPT. There shall be no discharge of process wastewater pollutants. (d) Extrusion press hydraulic fluid leakage. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of zirconium-hafnium extruded --------------- Chromium.................................... 0.104 0.043 Cyanide..................................... 0.069 0.029 Nickel...................................... 0.455 0.301 Ammonia..................................... 31.6 13.9 Fluoride.................................... 14.1 6.26 Oil and grease.............................. 4.74 2.85 TSS......................................... 9.72 4.62 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (e) Swaging spent neat oils--Subpart I--BPT. There shall be no discharge of process wastewater pollutants. (f) Heat treatment contact cooling water. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of zirconium-hafnium heat treated --------------- Chromium.................................... 0.151 0.062 Cyanide..................................... 0.100 0.041 Nickel...................................... 0.659 0.436 Ammonia..................................... 45.7 20.1 Fluoride.................................... 20.4 9.06 Oil and grease.............................. 6.86 4.12 TSS......................................... 14.1 6.69 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (g) Tube Reducing Spent Lubricant--Subpart I--BPT. (1) There shall be no discharge of process wastewater pollutants except as provided under paragraph (g)(2) of this section. (2) Process wastewater pollutants may be discharged, with no allowance for any pollutants discharged, provided the facility owner or operator demonstrates, on the basis of analytical methods set forth in or approved pursuant to 40 CFR part 136, that the concentrations of nitrosamine compounds in the wastewater discharged from the tube reducing process do not exceed 0.050 mg/l of N-nitrosodimethylamine, 0.020 mg/l of N-nitrosodiphenylamine, and 0.020 mg/l of N-nitrosodi-n- propylamine. (3) The demonstration required under subparagraph (g)(2) of this section shall be made once per month until the demonstration has been made for all three nitrosamine compounds for six consecutive months, after which time the demonstration may be made once per quarter. If a sample is found to contain any of the foregoing nitrosamine compounds at concentrations greater than those specified in subparagraph (g)(2) of this section, the actions described in paragraph (g)(4), of this section shall be taken, and the demonstration required under paragraph (g)(2) of this section shall be made once per month until it has been made for all three nitrosamine compounds for six consecutive months. (4) If sampling results show that any of the foregoing nitrosamine compounds is present in the process wastewater at concentrations greater than those specified in subparagraph (g)(2) of this section, the facility owner or operator shall ensure that, within thirty days of receiving written notification of the sampling results, there is no further discharge of tube reducing spent lubricant wastewater until the owner or operator: (i) Performs a subsequent analysis which demonstrates that the concentrations of the foregoing nitrosamine compounds do not exceed the levels specified in paragraph (g)(2) of this section; or (ii) Substitutes a new tube reducing lubricant and thereafter complies with the requirements of paragraph (g)(3) of this section; or [[Page 781]] (iii) Determines the source of the pollutant whose concentration exceeded the level specified in paragraph (g)(2) of this section and demonstrates to the satisfaction of the NPDES issuing authority that such source has been eliminated. (5) The concentration limits specified in paragraph (g)(2) of this section apply at the point of discharge from the tube reducing process. However, sampling after the tube reducing wastewater has been commingled with other wastewaters is permitted if: (i) Any dilution caused by the other wastewaters is taken into account in determining the appropriate (i.e., lower) allowable discharge concentration; and (ii) An analytical method of sufficient sensitivity is used to measure the levels of each of the foregoing nitrosamine compounds in the wastewaters being sampled. (h) Surface treatment spent baths. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of zirconium-hafnium surface treated --------------- Chromium.................................... 0.150 0.61 Cyanide..................................... 0.099 0.041 Nickel...................................... 0.653 0.432 Ammonia..................................... 45.3 20 Fluoride.................................... 20.3 8.98 Oil and grease.............................. 6.80 4.08 TSS......................................... 14 6.63 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (i) Surface treatment rinse. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of zirkonium-hafnium surface treated --------------- Chromium.................................... 3.91 1.60 Cyanide..................................... 2.58 1.07 Nickel...................................... 17.1 11.3 Ammonia..................................... 1,190 521 Fluoride.................................... 529 235 Oil and grease.............................. 178 107 TSS......................................... 364 173 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (j) Alkaline cleaning spent baths. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of zirconium-hafnium alkaline cleaned --------------- Chromium.................................... 0.704 0.288 Cyanide..................................... 0.464 0.192 Nickel...................................... 3.07 2.03 Ammonia..................................... 214 93.8 Fluoride.................................... 95.2 42.3 Oil and grease.............................. 32 19.2 TSS......................................... 65.6 31.2 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (k) Alkaline cleaning rinse. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of zirconium-hafnium alkaline cleaned --------------- Chromium.................................... 13.8 5.65 Cyanide..................................... 9.11 3.77 Nickel...................................... 60.3 39.9 Ammonia..................................... 4,190 1,840 Fluoride.................................... 1,870 829 Oil and grease.............................. 628 377 TSS......................................... 1,290 613 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (l) Sawing or grinding spent emulsions. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of zirconium-hafnium sawed or ground with emulsions --------------- Chromium.................................... 0.124 0.051 Cyanide..................................... 0.082 0.034 Nickel...................................... 0.540 0.357 Ammonia..................................... 37.5 16.5 Fluoride.................................... 16.7 7.42 Oil and grease.............................. 5.62 3.37 TSS......................................... 11.5 5.48 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (m) Wet air pollution control scrubber blowdown--Subpart I--BPT. There shall be no allowance for the discharge of process wastewater pollutants. [[Page 782]] (n) Degreasing spent solvents--Subpart I--BPT. There shall be no discharge of process wastewater pollutants. (o) Degreasing rinse--Subpart I--BPT. There shall be no discharge or process wastewater pollutants. (p) Molten salt rinse. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthy any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off pounds) of zirconium-hafnium treated with molten salt --------------- Chromium.................................... 3.33 1.360 Cyanide..................................... 2.20 0.907 Nickel...................................... 14.5 9.60 Ammonia..................................... 1,010 443 Fluoride.................................... 450 200 Oil and grease.............................. 151 90.7 TSS......................................... 310 148 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (q) Sawing or grinding contact cooling water. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of zirconium-hafnium sawed or ground with contact cooling water --------------- Chromium.................................... 0.142 0.058 Cyanide..................................... 0.093 0.039 Nickel...................................... 0.617 0.408 Ammonia..................................... 42.8 18.8 Fluoride.................................... 19.1 8.48 Oil and grease.............................. 6.42 3.85 TSS......................................... 13.2 6.26 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (r) Sawing on grinding rinse. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of sawed or ground zirconium hafnium rinsed --------------- Chromium.................................... 0.792 0.324 Cyanide..................................... 0.522 0.216 Nickel...................................... 3.46 2.29 Ammonia..................................... 240 106 Fluoride.................................... 107 47.5 Oil and grease.............................. 36 21.6 TSS......................................... 73.8 35.1 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (s) Sawing or grinding spent neat oils--Subpart I--BPT. There shall be no discharge of process wastewater pollutants. (t) Inspection and testing wastewater. Subpart I--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of zirconium-hafnium tested --------------- Chromium.................................... 0.007 0.003 Cyanide..................................... 0.005 0.002 Nickel...................................... 0.030 0.020 Ammonia..................................... 2.06 0.903 Fluoride.................................... 0.917 0.407 Oil and grease.............................. 0.308 0.185 TSS......................................... 0.632 0.301 pH.......................................... (1) (1) ------------------------------------------------------------------------ 1 Within the range of 7.05 to 10.0 at all times. [50 FR 34270, Aug. 23, 1985; 51 FR 2888, Jan. 22, 1986, as amended at 54 FR 11350, Mar. 17, 1989]