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COLORADO DEPARTMENT OF HEALTH, Water Quuliw Comrol Division <br />Rationale - Puge 6, Perini[ No. CO-0034141 <br />Since outjalls 004, 007, 009, 0!!, 0l1. 0/3, 0/4, 0/5, 0/6. 0/7, 0/8. 0/9, 010 nnrl 01/ rlo not dischnrge <br />pollutan(s limited by water quulit}~ standards, Leith the ecception gjpH, low flows wilt no[ be used m calculate water <br />yualin'-bated effluent lhnitntion.c. <br />The acute and chronic low flows ojNee Willimnr Fork River teill be aced to enlculnte'.vnter quality-based effluen7 <br />!lmimtion.r at outjnlls 003 and 014, which dicchurge mine water; outfnll 022, which di.cdmrgec .epoiLc.tpring water: and <br />ourfall 023, wdeich discharges effluent lram the domestic wastewater treatment ponds. <br />IV. FAC/LITYDESCR/PT/ON <br />A. /nduslry Description <br />Tire CEC Eagle Mine Complex i.c nn underground roal mining operation. Surface raining conducted in the pact hoc ceased <br />and dint silo is in the post-raining plence: however, underground mining continues. <br />Table /!-l shows the sources ojull outjnllr. The surface areas ojthe site hove been reconr'oured and are revegeturing; rhu.r. <br />ull.curfuce runoJjpondr/outfir/Lr serve post-mhring urens. The mine drainage outjd/s discharge mine realer from <br />underground ureuc x•here mining previously took place. A.c such. deere is the potemia! shut this drainage inns conmet nreo.c <br />preeioucly mined. <br />1. True njlndu.ctrt" CEC operates un underground coal minDtg operation. <br />Sources m the Treatmem Plant: On September 17. l 990, during initial revic w ojdee renewal application Irv the <br />DivLrion. CEC requested that the permit be amended to add m the dischnrge from Ourfnll 009 the flow jrorn un oil/water <br />,separator. The oil/water separator receires wm~h down water from n service building'. Water jrorn the separator flows <br />ro sedimentation pond SA-PI where it is commingled with rureofjjrorn reclnirned urens ajthe sire. The discharge from <br />Pond SA-Pl i.c Outfnll 009. Based on infonnntion provided by the permittee in Nee above referenced letler, the oil/water <br />separator flon• i.r nn inrignifrcnnt yunntiN and the pond i.c designed to handle well in ~erccsc of the additional flow. <br />3. ChernicnLc Used: No changes in chemicnLc used nt the facility have occurred .Snce 7lre i.r.ernnce of the previous permit. <br />ljadditional chemicnLc are proposed for u.ce. dre permittee must submit a Mruerinlc SajeN data Sheer (ti1SDS) for the <br />chemical for review and approval. <br />B. Wasrewaler Treatment Description <br />With the erce/nion ojthe addition ojthe oil/wnter.reparntnr:for dre [reatmem ojadditional Jlow.c to Outfall 009. no changes <br />with dre tvn.cteknrer trenunent .cvctem.c hove occurred.cince the i,csuance ojthe previous permit. <br />V. PERFORMANCE HISTORY <br />A. Monitoring Data <br />Di.cchnree Monitoring Renortc: Tahlec V-l, V"-1, V-3 and V-4 surnrnur'ize the e/Jluent darn reported on the monthly <br />Di.cchnrge Monitoring Reports (DMR.rI for Outjnlls 013, 003, 012, and 014 respertlvelc, from the CECfirciliNjrom <br />January l 991 to December / 992. In the monthly sabmltted DA1R.c, dre permittee indicated that no dischnrge had <br />occunedduring 1992fram Orrtjn//s 004, 007, 009, 0//, 0/1, 0/3. 0/4, 015, O16, 0/7. 0/8, 019, 010, and 02/. <br />These dischnrge.c con.ci.ct nfsurface n+no jfrom post raining urens. <br />