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<br />~ <br />~ <br />Cl <br />C\! <br /> <br />VI. WfiTER QUALITY COSTROL <br /> <br />HndtOr prcevisi:ns 0f the Fed'~ral Water Fc,llution Control Act, as <br />amended (33 D.S.C. 466 et seq', in the surveyor planning of a reservoir <br />by any Federal agency, c"nsid"ratLcn must be given to the inclusion of <br />stc'rage for r"gulation c,f streamflcw for thtO purpose of water quality <br />cc"ntrol. it is exprtOssly stated that any such ste'rage shall not be <br />pr~vided as a substitJtt for adequate trEatm~nt or other methods of CDn- <br />tr~llling wastes at their S-jurces G <br /> <br />InvestigatL:.n ,~)f Fo~tL.ti(~n Suurc'2E. <br /> <br />Investigation of water quality deterioration in the proposed Yellow <br />Jacket Project area was separated intu four classes, i.e., pollution <br />resulting from municipalities, industrial activity, agricultural functions, <br />and natural causes. <br /> <br />Since the Prc'ject invulves b.:Jth the White and the Yampa River Basins, <br />consideration for each a.JOrce of pollution was given 0n an individual <br />basin basis. <br /> <br />A criteria of 5 mg/l as a minimum dissolved oxygen (DO) concentration <br />was selected because game fish require at least this concentration for a <br />healthy environ'llent and beCause other factors such as recreational activity <br />and aesthetic appear"nctO requirtO no more than 5 mg/! of DO. As field evi- <br />dence indicated that the water temperature seldum raised above 200C, this <br />temperature wacS used in DO Calculatic>lls. <br /> <br />Sr:ea'iIi.bQat Springs and Grctig are tnE- ffiaju:)r contribute,rs of domestic <br />waste to the Yampa RivtOr. rit present St€amb.)at Springs, population 1,850, <br />treats its waste in an Imn }ff tank while Craig, p,-"pulation 4,000, treats <br />its wastes with primary sedimentation followed by lagoons. The present <br />waste loading to th" Ya'Iipa Idver causes no environmental health, recreational, <br />or esthetic problems. <br /> <br />Calculations reveal that the prr'jected waste loading for the year <br />2065 can be easily assimilated by thetampa River. If the projected waste <br />from Ste6mboat Springs and the other small tc,wns will be treated such that <br />85% of the lliuche:nical Oxygen Demand (300) is remuved and if this waste <br />is further red'JctOd by the stream assimilati,"il capacity of the Yampa River <br />upstream frc,:n Craig, the daily BCD luading arriving at Craig will be 210 <br />pCJUnds. After adequate treatllEnL Craig will pre,'duce an additional 560 <br />pounds per ddY. c~his daily L'ading ,,)f 770 p,"\mds of BOD requires a flow <br />0f 9.5 cubic feet per second (cfs) below Craig in order to maintain dis- <br />solved uxygen (CD,~' c,:'ncentratLm "f at least 5.0 mg/l at a maximum water <br />temperature cf 20':'C. I'he United Statts Ge')h'gical Survey flow records for <br />the station at Maybell, Colorado, 40 river miles below Craig, reveal that <br />95% of the tUTlE the fL'w in the Yampa River is equal to or exceeds 80 cfs; <br />and 99.9% ",f the time the fl,,)w equals ,:,r exceeds 9.5 cfs. <br /> <br />~23= <br />