[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: 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]