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COLOR4D0 DEPARTit'IENT OF PUBLIC HE:iLTH A,ND EIWIRONrIq£NT. tauter Quality Cururol Dirrsinrt <br />Rnaonrrle Amendment No 1. Page 2. Perrnir A'o. CO-0000221 <br />/1!. PURPOSE OF A+L/ENDd/ENT <br />• /n a lever dared November 6, 1998, the pernuaee requested a permit umendrrrenr Tlrey are adding su crew ponds, each <br />with separate outfalls. These wilt be outfnlls 012. 013. U14. 01 ~. 01 ti and U/ 7. Additionally, tl+ey rerpres(ed a change <br />in the whole efjlrteru toanry CIVET) testing species for outfall 005. !n n subsequent lever dared November 25, 1998, the <br />penniuee requested that the Division reduce the monitoring frequencies for pFl, oil and grease and flow for all ourfalls <br />ercepr 003. They requested tlmr rhts change he incorporated into dte amendnu-rat requested by the first letter <br />/V. RECEIVING STREAb1 /NFORL/ATlON FOR NEW OUTFACES <br />A. /dentijication, Classificatimt and Standards <br />lderuificatiat: Outfalls 012. 013, 014 mrd 0/S discharge m Snge Creek or unnamed tributaries Ou Jnll 016 <br />discharges to an unnamed tributary to Hubberson Gulch, n rribrunry to Dry Creek. Outfnll 017 discharges m <br />Hubberson Gulch. Dry Creek, Hubberson Gulch, Sage Creek artd their vibutaries are within Segment !2 of dte <br />Yampa River Strb-basin of the Upper Colorado River Basin. <br />2. Classification: Segment l Z is designated Use Protected and classified jot the following uses: Recreation, Class <br />2; Aquatic Life, Class 2 (cold), Agrindtrrre. <br />Numeric Standards: 7)te standards which leave been assigned in accordance with the classifications jot segment <br />l2 can be jotrnd in rfte Clnssiftcations and Numeric Standards jot the Upper Colorado River Basin (Regulation <br />No. 33, 5 CCR 1002-33), as amended November 9, 1998. There are no metals standards jot this segment. <br />B. Receiving Water Da[a <br />1. Quantity Anne mul Chronic Low Flows: T1te flows which will be used m calculate acute acrd chronic effluent <br />(irnitntions are the one rlny in three year low flow (1 E3) mid the 30 day in three year low flow (30E3) <br />respec(ively. Those Jlows have been determined jot Dry Creek, Sage Creek, Hubberson Gtdch and them <br />unnamed tributaries by rite Water Qunliry Control Division, and are as follows (all flows in cubic jeer per <br />second): <br />Table IV-1 -- Acu[e and Chronic Low Flows <br />Acute Chronic <br />Annual 0 0 <br />2. unli Quality data far Dry Creek, Snge Creek Hubberson Gulch and their unnamed tnbruaries are <br />unnecessary jar this amendment. Please see section Vl.A.2. discussion of wa[er quality standards. <br />V. FACILITY DESCRIPTION <br />A. Industry Description <br />Type of Gtdustrv Seneca Cual Company operates three surface coal mines -the Seneca I1 Mine, the Seneca 1I <br />Wes[ Mine and the Yonst Mine, together as what they refer to as a"'Logical Mining Unit ". Some areas of the <br />mines have been reclaimed. however, no sedimentation pond systems serve entirely reclaimed areas. <br />?. Sources ro the Treatment S ~.r1 !ems. The jncility generates surface runoff, spoils spring x-rater, pit punrpage <br />(typically precipuarton drat has entered dte actively mined pit areas) and vehicle (cool haul truck) wash water. <br />• These waters are routed ro the vanous sedimemm~on ponds jar rreunneru curl discharge. Table V-1 nn page <br />specifies winch sourc'es' are protected m be !rented m dte new pond rysterns. <br />