[Code of Federal Regulations] [Title 40, Volume 27] [Revised as ofJuly 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR436.262] [Page 361-362] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 436--MINERAL MINING AND PROCESSING POINT SOURCE CATEGORY--Table of Contents Subpart Z--Novaculite Subcategory Sec. 436.262 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. (a) Except as provided in Secs. 125.30 through 125.32, and subject to the provisions of paragraph (b) of this section, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT): There shall be no discharge of process generated waste water pollutants into navigable waters. (b) Only that volume of water resulting from precipitation that exceeds the maximum safe surge capacity of a process waste water impoundment may be discharged from that impoundment. The height difference between the maximum safe surge capacity level and the normal operating level must be greater than the inches of rain representing the 10-year, 24-hour rainfall event as established by the National Climatic Center, National Oceanic and Atmospheric Administration for the locality in which such impoundment is located. [40 FR 48657, Oct. 16, 1975, as amended at 60 FR 33969, June 29, 1995; 60 FR 35796, July 11, 1995] [[Page 362]] Subpart AA--Fire Clay Subcategory [Reserved] Subpart AB--Attapulgite and Montmorillonite Subcategory [Reserved] Subpart AC--Kyanite Subcategory [Reserved] Subpart AD--Shale and Common Clay Subcategory [Reserved] Subpart AE--Aplite Subcategory [Reserved]