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COLARaDO DEPAR^.S_r*1'L OF HE~I.-Ii. 4acar Qua-. .y conc-- - ~.. ~ .... Bacionala, Amendment No. 1 - Page 2 Parnit Na. CO-0038776 Y. DISCUSSION OF AHE~DHE.*1S: (Cantiauad) vas fractured. She tmdergraund pipe does not appear on nay of eha as-built ~. or facility drawings. Following Lnvaatigaeion of the aittsaeion, it vas determined tsar the pip• vas the NPDES diseharga pipalina for the 007A domestic vastavatar ~eaCmane plane (~iUTP) polishing pond. Duziag the eonst-vetion activities, the pipalina vas ruptured beyond repair and could not ba m~ndad unless the antis aaction of pipalina vas uaaarrisad and replaced. Iastaad of raplaeiag the pipeline, the diseharga frog the polishing pond 007A vaa~seroutad. Sha polishing pond afflwat aov floes to Pond !D3-Z, whets it is discharged under NPDES point 004A. ' Nat only did this solution avoid unnecessary surface disturbaaea, but it also alloys a double polishing pond system for the GfrLP. As required by Loa CDPS permit, the parmictea has indicated that they will eontiaue to monitor dischargn paints 007A and 004A as independent discharges. Thn only change will be that LLle afflunne from 007A will flay to point 004A prior eo being discharged off-site, Originally for L4e public notice draft permit, the limitations and monitoring for outfall 007 (on pages ld and lg of the permit) were modified to also be applicable foc oucfall 004, However, based upon permietee comments, as is further discussed in Section 4I, below, these particular limits and monitoring ae oucfall 007 were deleted, since these should ba adequately addressed ac outfall 004, Thus, no changes warn made eo the permLc as a result of this emendator. Don Holmer • November 27, 1992 ~. VI. CHANGES i0 Y~l:IS FOL.I.04TING PUBLIC NOTICE P~IOD =rte only comment letter Lhat vas zeeeived regardLng this amendment vas from the permictae, ?louncain Coal Company, dated January 19, 1993. In this Teeter, Mountain Caal Company contested eo Che inclusion of limits and monitoring for the parameters related to the domestic vastavatar trnatmant plane (BODE„ SSS, Fetal Colifora Bacteria, and IRC) at discharge point 004. She pnrmittne orated that they belLnve these doubin monitoring 1s tautaccnsary and that the monitoring requirements associated with outfall 007 nand aot bn duplicated for outfall 004, In thn comment latter, lSouaeala Coal also indicatnd thn following: Each outfall is associated with a different type of industrial pond. Dischargn 007A 1s from {lest Elk Hint's (WE"t's) waste water trnataenc plant (~.T°) and the diseharga from 004A Ls from a sedimentation control pond. 'Iha affluent flaying from point 007A has been treated in eon~unetion vic4 eha monitoring 1Smicatlons sac forth for RGTPs, including BOD and focal eoliform. She pond associated with discharge . potnc 004A ahauld not receive any source of BOD, ehlorinn, or fecal ' eolifora ocher than lrom the created effluent from 007A, thereforn it is not a WTP and thn monitoring limitations aac forth for QvIPs should not be required for diseharga poiac 004A. Discharge 004A will continue . to fttnetion as a sadimnnution control pond only and the traatnd •ffluenc from another source should aac change its designation.