Laserfiche WebLink
COLORADO DEPARTR4ENT OE PUBLIC HE.-ILTH AND ENVIRDr\4L1EAT, Water Quahn Control Divrsion <br />Rationale -Amendment No. 1 Pnge 5. Permit No CO-00011221 <br />2. Weser OualiN Bnsed Efllaen[ Lirnitarinns: All si.c ojdre new ontfalls discharge ro Sage Creek. Dry Creek or <br />• their tribu(nries. till of which are tnbumry to dre Yampa River. These wnlers are +vidrin segme'~r !2 cf Ure <br />Ynmpn River sub-basin of the Upper Co[ontdo River 6nsut. This segment has no metals or aquauc hfe <br />standards other rhmr pN Sage Creek. Dry Creek and tribrunries /rcrve acute and drruntc low flows of zero <br />The mininuun disrnnce from these outfa(ls ro dre Yarnpn River is ten miles. Tare Yampa River in (he vicrniry itas <br />a substantial f]o+r that would dilute any flow from segment l2. On this basis, it is very unlikely drnl these <br />drschmges could nnpacr the Yampa Pover. Therefore, the Division has determined that water ytmliry based <br />effluent linrltntions (other rJtan pH) ore nor appficnble jot tha nmerrdment. <br />3. Discussion o~Ruenr Limimtions: <br />a) Regrdauons for E~reru Lunirations: The Regulnrions jot EfJiuem Lunim+ions (5 CCR 1002-h2) apply to the <br />conventional pollumnts For these ourjalls, dre linetnrions for Oil and Grease are based on (his regulntion. <br />b) rlonlicnble Federal EfJluem Guidelines and Standards: Tire federal guidelines which apply to tlris type of <br />facility are found under 40 CFR 434, tided Coal Mining Point Sauce E/jiuen( Guide[inec. The limitntions <br />which npply are: <br />Table VI-3 -- Federal Standards (40 CFR 434) <br />Parameter Limitations <br />30 Day AvR Daily Max. <br />pH, s. u. (minirrrunr - m¢>intum) ---6.0 - 9.0--- <br />Total Suspended Solids, mg/F'* 3i 70 <br />Total Iron, mg/F* <br />• BAT' ` 3.5 7.0 <br />NSPS * * * 3.0 6.0 <br />Settleable Solids, mA/E" N/A 0.5 <br />• These puramerrrs subject ro Burden of Proof Requirements. See nC.R seetion <br />Best Avni(abfr Technology - app(irs ter those fircitiriec ulreadv conslrocred <br />••' New Source Performnnte Smrutu rds - apples m those faa(ures constructed uf[er 5/d184 <br />Alrerrtate Limitation Burden ojProajRequiremertts: !n conformance with 40 CFR 434.63, the permittee Irns <br />the burden of proof +vlren requesting relief from total suspended solids (TSS), total iron and/or settleable <br />solids limitations, as nppropriare. The intent of dris regula(ion is m afford relief only when needed due m a <br />volume of wnrer generated by a specific storm event, it i-r not intended to 6e a«tornatically applied to all <br />discharges caused by precipitation, nor to be used to disrlrarge volumes in excess of (hat generated by (/tie <br />smrm event. On this basis, rehejsirall be grunted only when necessary acrd shall trot 6e granted when the <br />pennit(ee Irns control over the dischnrge, enabling rhenn ro meet t!re primary limitations. The permittee <br />should endeavor (o meet the primary lirrnitn(ions whenever possible. Al! ntnnunl dewatering of ponds that <br />ore equipped with atuomatic dewatering system must meet TSS and total iron limitntions. /ja pond has <br />only rnanun! dewarerirrg capability, relief is available only to the es(ent required to regain necessary <br />stability and capacity. The Drvision shall have final au(hority in de(ermining whether reliejis granted. ,qs <br />port of this determination, dte Division shall evaluate whether the permitree could have controlled the <br />discharge in such n manner that primary limitations could have been met. <br />11 Fnr rninlall ro waive TSS and total iron lirnimriars, it is necessary to demnrnsVate tha( discharge <br />occurred within 481nours after measurable precipunrion has sropped. To woive settlehble solids <br />limi(ntions. it is necessary to prove drat dischnrge occurred within 48 hours after precipitatron greater <br />than the 10-year. 24-parr event Aa.r sropped. <br />• <br />