[Code of Federal Regulations]

[Title 40, Volume 28]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR422.51]



[Page 641]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 422_PHOSPHATE MANUFACTURING POINT SOURCE CATEGORY--Table of Contents

 

           Subpart E_Defluorinated Phosphoric Acid Subcategory

 

Sec.  422.51  Specialized definitions.



    For the purpose of this subpart:

    (a) Except as provided below, the general definitions, 

abbreviations, and methods of analysis set forth in 40 CFR part 401 

shall apply to this subpart.

    (b) The term process waste water means any water which, during 

manufacturing or processing, comes into direct contact with or results 

from the production or use of any raw material, intermediate product, 

finished product, by-product, or waste product. The term ``process waste 

water'' does not include contaminated non-process waste water, as 

defined below.

    (c) The term contaminated nonprocess waste water shall mean any 

water including precipitation runoff, which during manufacturing or 

processing, comes into incidental contact with any raw material, 

intermediate product, finished product, by-product or waste product by 

means of:

    (1) Precipitation runoff, (2) accidental spills, (3) accidental 

leaks caused by the failure of process equipment and which are repaired 

or the discharge of pollutants therefrom contained or terminated within 

the shortest reasonable time which shall not exceed 24 hours after 

discovery or when discovery should reasonably have been made, whichever 

is earliest, and (4) discharges from safety showers and related personal 

safety equipment, and from equipment washings for the purpose of safe 

entry, inspection and maintenance; provided that all reasonable measures 

have been taken to prevent, reduce, eliminate and control to the maximum 

extent feasible such contact and provided further that all reasonable 

measures have been taken that will mitigate the effects of such contact 

once it has occurred.

    (d) The term ten-year 24-hour rainfall event shall mean the maximum 

precipitation event with a probable recurrence interval of once in 10 

years as defined by the National Weather Service in technical paper no. 

40, ``Rainfall Frequency Atlas of the United States,'' May 1961, and 

subsequent amendments or equivalent regional or State rainfall 

probability information developed therefrom.

    (e) The term 25-year 24-hour rainfall event shall mean the maximum 

precipitation event with a probable recurrence interval of once in 25 

years as defined by the National Weather Service in technical paper no. 

40, ``Rainfall Frequency Atlas of the United States,'' May 1961, and 

subsequent amendments or equivalent regional or State rainfall 

probability information developed therefrom.