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COLOR.IJO U(iP.4RTrLICVI OFPCBI_IC NL:V.TH:LVD E-VL'IRO:V:LIf:VT, lVuter Qua(u: Control Drtr.cirnr <br />Rutru~mle ~Unenrbnen[ No ( Page Z, Pennrt :\`o. CO-0000221 <br />/!/. PURPOSE OF:4:LlF_NUdIENT <br />• !n a lever d~ued November h. 1994, the OPrn IIUPP req«PSled a peflll!( (Ilfle'.'I(i:Rdtlt. T?i E~ are add(1Ig SLt /1 c'w pOA((5, etl C)i <br />wuh sepnatre ourfalls. These will be ornfulL• 012. 013, 01=i. 01~. Olri m+d 017 ,•Idduionnlly, d+e<~ requested a change <br />in the ,vho(e effluent to.eieity (tiVET) testing species for outful( 005. In n subsequent letter dared November 2.i, /993, the <br />pennittee requested drat rile Drvisiun reduce the numitoring frequenr.+es jot pH. otl mul grease and flnrv for ulI ourfu!ls <br />except 003. Ti+ey requested that this change be incoroorated m[o dre amendment reglrested by the firtit letter. <br />!V. RECE/VIN'G STRE:LLI /,VFOR,YLdTiON FOR NEIY OUTFrILLS <br />A. Idenrijication, C/assijicadon and Standards <br />Identi tcation: Outfalls 012, 013. 0!4 m+d 015 discharge to Snge Creek or unmm~ed tributaries Ourfhll 0l6 <br />discharges to an unnamed tributnry to Hubberson Grrlch, a vibutary to Dry Creek. Ourfnll 0!7 discharges to <br />Hubberson Gulch. Drv Creek, Hubberson Guldr, Sage Creek mrd them tributaries are within Segmen[ !2 of the <br />Ynmpa River Sub-basin afthe Upper Colorado River Basin. <br />Classificatiar7: Segment 12 is designated Use Protected and classijted jot the following uses: Recreation. Closs <br />2; Aquatic Life, Class 2 (cold); Agriculture. <br />3. Numeric Standards: The standards which have been assigned in accordance with the classifications for segment <br />12 can be found in the Classifications and Numeric Standards for the U2oer Colorado River Basin (Regulation <br />No. 33, 5 CCR 1002-33), as amended November 9, ]998. There are no metals standards for this segment. <br />B. Receiving Water Data <br />• 1. Quantity Acute and Chronic Low Flows: The flows which will be used to calculate acute and c/vonic efjiuene <br />limitations are dre one day m three year low flow (1 E3) and the 30 day in three year low flow (30E3) <br />respectively. T/tose flows /lave been determined for Dry Creek, Sage Creek, Hubberson Gulch and their <br />rtnna»ted tributaries by tl+e LVater Quality Control Division, and are ns follows (all Jlorvs in cubic jeer per <br />second): <br />Table IV-I -- Acute aid Chronic Low Flows <br />Acute Chronic <br />Anraeai 0 0 <br />2. un[i Qualiry data for Dry Creek, Sage Creek Hubberson Gulch and their unnamed tributaries are <br />unnecessary for this amendment. Please see section VI.A.2. discussion of water quality standards. <br />V. FACILITY DESCRIPTION <br />A. Industry Description <br />1. Tvpe o~+dustry Seneca Con! Canpany operates three surface coal mines -rite Senecn !/ rY(ir7e, the Seneca I! <br />/Vest Mine and the Yoasr Mine, together as whet thry refer to as a "Logical Mining Unit ". Some areas of the <br />mines hove been rednimed. however, rto sedimentation pond systems sense entirely reclnimed areas <br />2. Sources to d+e Treatment Svstems; Tl+e facility generates surfnce numff. spoils spring venter, pu pumpage <br />(typically preapitauan drat Ras entered the actively rmned pit nreas) and vehicle (COaI stmt( truck) wash venter. <br />• These waters are roared m the vanous sedimenmrion ponds for rrenrmeru and disdmrge. Tnble V-I mt page 3 <br />specifies whtclr sources are projected to be treated in die new pond sysrerns <br />