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CO1.OliADO Ol.P.1RTMENT OF flEALTIl, R'arcr Qunlifv Control DirLcinn /lntinnaM - l'n,ir IG, Prrnuf No. CO-0032638 Smrnnvn~rr: Active and inacfi ve coal training openuinn.c where srornnvafer conies info cnntnct with overburden, rnw material, intermediate products, byproducts, finicbed products or wnsfe praducts located at die mining she are included in category (iii) of the federal stormwater regu(arions. Such facilities rare required to have applied for a permit to discharge stormwater associated with nuning activity on or before October 7, 7992. The Division has no record of receipt oja stormwater discharge permit application for the Pittsburg and Mu7NSZy Coal Mining Co. at this time. Stormtvater permitting issues for this facility will be handled separately by the Division's S[ormwater Unit, although this permit may be reopened at a later date to incorporate stormwater provisions, if deemed appropriate. 8. Economic Reasonableness Evaluation: Section 25-8-503(8) of the revised (June 198SJ Cofarado Water Quality Control Act required the Division to Auermine whuher or nor any or all of the water quality standard based effluent limitations are reasonably related to the ecanom7c, environmental, public health and energy impacts to the public and affected persons, and are m furtherance of the policies set forth in sections 25.8-192 and 25-8-104. 77u Regulations for the State Discharge Perrrut System, 6.1.0, further define this requirement under 6.12.0 and state: 'Where economic, environntemal, public heahh and energy impacts to the public and affected persons have beat considered in the class fuatiotts and standards setting process, permits written to meet the standards may be presumed to have taken into consideration economic factors unless: aJ Anew permit is issued where the discharge was not in uistetu:e at the time of the class fu:ation and standards rufentaldng, or bJ In the case of a continuing discharge, additional information or factors have emerged that were nor anticipated or considered at the time of the class fication and standards rulernaldng. 77te evaltuuion for this perm7r shows that the Water Quality Control Commission, during their proceedings to adopt the Clans fkation and Numeric Standards for the Lower Colorado River Basin, considered economic reasonableness. Funhermare, this is nor a new discJtarger and rto new information has been preserved regarding the class~ations and standards. 7herefort, the wafer quality standard-based effluent limitations of this permit are determined to be reasonably related to the economic, environnumal, public health and energy impacts ro the public and affected persons and art in furtherance of the policies su forth in Sections ISM-!02 and 104. If the perminee disagrees with this finding, pursuant to 6.12.0(2J(bJ the permiaee should submit all pertinent injormatioti to the Division during the public notice period.