[Code of Federal Regulations]
[Title 40, Volume 27]
[Revised as ofJuly 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR471.24]

[Page 702-703]
 
                   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 B--Magnesium Forming Subcategory
 
Sec. 471.24  Pretreatment standards for existing sources (PSES).

    Except as provided in 40 CFR 403.7 and 403.13, any existing source 
subject to this subpart which introduces pollutants into a publicly 
owned treatment works must comply with 40 CFR part 403 and by August 23, 
1988 achieve the following pretreatment standards for existing sources 
(PSES). The mass of wastewater pollutants in magnesium forming process 
wastewater introduced into a POTW shall not exceed the following values:
    (a) Rolling spent emulsions.

                             Subpart B--PSES
------------------------------------------------------------------------
                                                             Maximum for
       Pollutant or pollutant property         Maximum for     monthly
                                                any 1 day      average
------------------------------------------------------------------------
                                                 mg/off-kg (pounds per
                                                million off-pounds) of
                                                 magnesium rolled with
                                                       emulsions
                                             ---------------
Chromium....................................         0.033         0.014
Zinc........................................         0.109         0.046
Ammonia.....................................         9.95          4.37
Fluoride....................................         4.44          1.97
------------------------------------------------------------------------

    (b) Forging spent lubricants--Subpart B--PSE. There shall be no 
discharge of process wastewater pollutants.
    (c) Forging contact cooling water.

                             Subpart B--PSES
------------------------------------------------------------------------
                                                             Maximum for
       Pollutant or pollutant property         Maximum for     monthly
                                                any 1 day      average
------------------------------------------------------------------------
                                                 mg/off-kg (pounds per
                                                million off-pounds) of
                                                 magnesium cooled with
                                                         water
                                             ---------------
Chromium....................................         0.127         0.052
Zinc........................................         0.422         0.177
Ammonia.....................................        38.5          17.0
Fluoride....................................        17.2           7.63
------------------------------------------------------------------------

    (d) Forging equipment cleaning wastewater.

                             Subpart B--PSES
------------------------------------------------------------------------
                                                             Maximum for
       Pollutant or pollutant property         Maximum for     monthly
                                                any 1 day      average
------------------------------------------------------------------------
                                                 mg/off-kg (pounds per
                                                 million off-pounds) of
                                                    magnesium forged
                                              --------------
Chromium.....................................        0.002        0.0007
Zinc.........................................        0.006        0.003
Ammonia......................................        0.532        0.234
Fluoride.....................................        0.238        0.106
------------------------------------------------------------------------

    (e) Direct chill casting contact cooling water.

                             Subpart B--PSES
------------------------------------------------------------------------
                                                             Maximum for
       Pollutant or pollutant property         Maximum for     monthly
                                                any 1 day      average
------------------------------------------------------------------------
                                                 mg/off-kg (pounds per
                                                million off-pounds) of
                                              magnesium cast with direct
                                                     chill methods
                                             ---------------
Chromiun....................................          1.74         0.711
Zinc........................................          5.77         2.41
Ammonia.....................................        527          232
Fluoride....................................        235          105
------------------------------------------------------------------------

    (f) Surface treatment spent baths.

                             Subpart B--PSES
------------------------------------------------------------------------
                                                             Maximum for
       Pollutant or pollutant property         Maximum for     monthly
                                                any 1 day      average
------------------------------------------------------------------------
                                                 mg/off-kg (pounds per
                                                million off-pounds) of
                                               magnesium surface treated
                                             ---------------
Chromiun....................................         0.205         0.084
Zinc........................................         0.681         0.285
Ammonia.....................................        62.1          27.3
Fluoride....................................        27.8          12.3
------------------------------------------------------------------------

    (g) Surface treatment rinse.

                             Subpart B--PSES
------------------------------------------------------------------------
                                                             Maximum for
       Pollutant or pollutant property         Maximum for     monthly
                                                any 1 day      average
------------------------------------------------------------------------
                                                 mg/off-kg (pounds per
                                                million off-pounds) of
                                               magnesium surface treated
                                             ---------------
Chromiun....................................         0.832         0.340
Zinc........................................         2.76          1.16
Ammonia.....................................       252           111
Fluoride....................................       113            49.9
------------------------------------------------------------------------

    (h) Sawing or grinding spent emulsions.

                             Subpart B--PSES
------------------------------------------------------------------------
                                                             Maximum for
       Pollutant or pollutant property         Maximum for     monthly
                                                any 1 day      average
------------------------------------------------------------------------
                                                 mg/off-kg (pounds per
                                                million off-pounds) of
                                               magnesium sawed or ground
                                             ---------------
Chromiun....................................         0.009         0.004
Zinc........................................         0.029         0.012
Ammonia.....................................         2.60          1.15
Fluoride....................................         1.16          0.515
------------------------------------------------------------------------

    (i) Degreasing Spent Solvents--Subpart B--PSES. There shall be no 
discharge of process wastewater pollutants.

[[Page 703]]

    (j) Wet air pollution control scrubber blowdown.

                             Subpart B--PSES
------------------------------------------------------------------------
                                                             Maximum for
       Pollutant or pollutant property         Maximum for     monthly
                                                any 1 day      average
------------------------------------------------------------------------
                                                 mg/off-kg (pounds per
                                                million off-pounds) of
                                                 magnesium sanded and
                                                  repaired or forged
                                             ---------------
Chromium....................................         0.273         0.112
Zinc........................................         0.904         0.378
Ammonia.....................................         8.25         36.3
Fluoride....................................        36.9          16.4
------------------------------------------------------------------------


[50 FR 34270, Aug. 23, 1985; 51 FR 2884, Jan. 22, 1986]