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COLORADO DEPAR7'!IENT OF IIEA1.T11 <br />4/a ter Quality Control Division <br />Rationale - Page 2 <br />Permit No. CO-0000213 <br />FACILITY DESCRIPTION: <br />Because the Nucla Hine has temporarily ceased operations, the permittee has <br />requested that the self-monitoring frequency for pH, oil and grease, snd <br />flow be reduced from weekly to monthly during the period that the mine <br />remains inactive. The permittee has supplied 4 years of self-monitoring <br />data for outfall 001 and 006 (from 12/79 through 12/83) which show, except <br />for a single ezception on 12/19/80, that compliance with effluent <br />limitations has been maintained. Outfalls 002, 003, 004, and 005 have never <br />discharged. <br />The Division will grant the permittee's request. <br />Peabody Coal will be required to notify the Division upon resumption of <br />active operations. liken the mine goes active the self-monitoring frequency <br />for pH, oil and grease, end flow will automatically revert back to weekly. <br />Additionally, this permit will serve to incorporate Federal BAT (Best <br />Available Technology Economically Achievable) effluent guidelines into tl~e <br />permit. An eaplanation of the applicable State and Federal guidelines <br />(including BAT) follows. <br />• APPLICABLE RULES AND REGULATIONS: <br />Table 1 below shows State Effluent Standards (SES), Federal Best Practicable <br />Control Technology (BPT), Federal Best Available Technology Economically <br />Achievable (BAT), and State slater Quality Standards (41QS) applicable to this <br />facility. <br />Table 1 <br />Parameter SES BPT BAT uQs <br />pN, s.u, a/ 6.0 - 9.0 6.0 - 9.0 N/A 6.5 - 9.0 <br />011 and Grease, mg/1 a/ 10.0 N/A N/A N/A <br />Total Suspended Solids, mg/1 30/45 d/ 35170 b/ c/ N/A N/A <br />Total Iron, mg/1 N/A 3.5/7.0 b/ c/ 3.5/7,0 N/A <br />Settleable Solids, ml/1 c/ N/A N/A 0.5 N/A <br />a/ This parameter applicable at all times <br />b/ Thie limitation applicable to discharges during periods of no preciptitation <br />• c/ Thie parameter applicable to discharges during periods of precipitation less <br />then or equal to the 10-year, 24-hour event for tl:ia facility <br />d/ This limitation does not apply pursuant to Section 10.1.3(3) of the State <br />Regulations for Effluent Limitations <br />7-6-29 <br />