[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: 40CFR401.17]

[Page 9]
 
                TITLE 40-PROTECTION OF ENVIRONMENT
 
      CHAPTER I-ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 401-GENERAL PROVISIONS--Table of Contents
 
Sec. 401.17  pH Effluent limitations under continuous monitoring.

    (a) Where a permittee continuously measures the pH of wastewater 
pursuant to a requirement or option in a National Pollutant Discharge 
Elimination System (NPDES) permit issued pursuant to section 402 of the 
Act, the permittee shall maintain the pH of such wastewater within the 
range set forth in the applicable effluent limitations guidelines, 
except excursions from the range are permitted subject to the following 
limitations:
    (1) The total time during which the pH values are outside the 
required range of pH values shall not exceed 7 hours and 26 minutes in 
any calendar month; and
    (2) No individual excursion from the range of pH values shall exceed 
60 minutes.
    (b) The Director, as defined in Sec. 122.3 of this 
chapter, may adjust the requirements set forth in paragraph (a) of this 
section with respect to the length of individual excursions from the 
range of pH values, if a different period of time is appropriate based 
upon the treatment system, plant configuration or other technical 
factors.
    (c) For purposes of this section, an excursion is an unintentional 
and temporary incident in which the pH value of discharge wastewater 
exceeds the range set forth in the applicable effluent limitations 
guidelines.

(Secs. 301, 304, 306 and 501 of the Clean Water Act (the Federal Water 
Pollution Control Act Amendments of 1972, 33 U.S.C. 1251 et. seq., as 
amended by the Clean Water Act of 1977, Pub. L. 95-217))

[47 FR 24537, June 4, 1982]

                           PART 402 [RESERVED]