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<br />APPEKDIX A
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<br />Criteria for \vater SegmeAt Classes al
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<br />As part of the section 303(e} planning process, the
<br />Governor of each State shall submit, a c,I.assification of seg-
<br />ments to the Regional Administrator not' later than February 15., .'., '
<br />'1973. The term "segment" means a portion of a basin the ,",';.::.\
<br />surfaCe waters of which have common hydrologic characteristies '",::)'
<br />(or flow regulation patterns) and common natural.physical".:
<br />chemical, and biological processes, incLuding reactions to 'i, ""'"
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<br />Classification shall, be based upon measured in-stream,
<br />water quality, where known, or where riot known, estimated
<br />in-stream water quality in the area of maximum pollutant
<br />'concentration.
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<br />Each segment shall be classified as follows:
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<br />(1)
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<br />Water QualitY.Class -any segme,nt where either: ,.
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<br />It is known to a reasonable degree of certainty
<br />that water quality will not meet applicable
<br />water quality standards after the application
<br />of the effluent limi~ations required by sections
<br />301 (b) (1) (A) and30l (bl(l) (B) of theFWPCA.
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<br />Thereis'substantial uncertainty as
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<br />limitations described above. .
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<br />Effluent Limitation Class - any segment where:
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<br />It is knowntoasubstantia1 degr~~Of certainty"~'?f;r::I
<br />that waterquali tyis ,meeting and will continue ,;,'-'i:fF".
<br />to meet applicable water quality standards after';~~:~::,/
<br />the application of the effluent 1imi tations, ,....\,.,,'
<br />required by sections 30l(b) (1) (A), and, 30l(b} (I) (B) ';:,<
<br />of the FWPCA. . '.,>;. '.-
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<br />tal Excerpted from~g130~2(m) andl30.21 of se~t.io~'303(eL\
<br />regulations proposed by OAWP December 28, 1972. .
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