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(continued) reduction attainable by the application of the best practicable control technology currently available.
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Except as provided in §§125.30 through 125.32, 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): For operations not employing wet processes there shall be no discharge of process generated waste water pollutants into navigable waters.

[60 FR 33969, June 29, 1995]

Subpart AG—Kaolin Subcategory [Reserved]
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Subpart AH—Ball Clay Subcategory [Reserved]
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Subpart AI—Feldspar Subcategory [Reserved]
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Subpart AJ—Talc, Steatite, Soapstone and Pyrophyllite Subcategory [Reserved]
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Subpart AK—Garnet Subcategory [Reserved]
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Subpart AL—Graphite Subcategory
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§ 436.380 Applicability; description of the graphite subcategory.
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The provisions of this subpart are applicable to the mining and processing of naturally occurring graphite.

§ 436.381 Specialized definitions.
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For the purpose of this subpart:

(a) Except as provided below, the general definitions, abbreviations and methods of analysis set forth in part 401 of this chapter shall apply to this subpart.

(b) The term “mine drainage” shall mean any water drained, pumped or siphoned from a mine.

§ 436.382 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
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(a) Except as provided in §§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):



------------------------------------------------------------------------
Effluent limitations
-----------------------------
Average of daily
Effluent characteristic Maximum values for 30
for any 1 consecutive days
day shall not
exceed_
------------------------------------------------------------------------
TSS....................................... 20 mg/l 10 mg/l.
Total Fe.................................. 2 mg/l 1 mg/l.
pH........................................ (\1\) (\1\)
------------------------------------------------------------------------
\1\ Within the range 6.0 to 9.0.


(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]