[Code of Federal Regulations]
[Title 40, Volume 26]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR418.11]

[Page 340-341]
 
                TITLE 40-PROTECTION OF ENVIRONMENT
 
      CHAPTER I-ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 418-FERTILIZER MANUFACTURING POINT SOURCE CATEGORY--Table of Contents
 
                 Subpart A-Phosphate Subcategory
 
Sec. 418.11  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 wastewater 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 wastewater'' does not include 
contaminated non-process wastewater, as defined below.
    (c) The term, contaminated non-process wastewater 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 
24-hour 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 in effect as 
of the effective date of this regulation.
    (e) The term 25-year 24-hour rainfall event shall mean the maximum 
24-hour 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 in effect, 
as of the effective date of this regulation.

[[Page 341]]

    (f) The term calcium sulfate storage pile runoff shall mean the 
calcium sulfate transport water runoff from or through the calcium 
sulfate pile, and the precipitation which falls directly on the storage 
pile and which may be collected in a seepage ditch at the base of the 
outer slopes of the storage pile, provided such seepage ditch is 
protected from the incursion of surface runoff from areas outside of the 
outer perimeter of the seepage ditch.

[39 FR 12836, Apr. 8, 1974, as amended at 41 FR 20583, May 19, 1976]