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Ridgway Reservoir Micro-Hydro Project Loan Feasibility <br />Page 32 of 42 <br />In the ec�-eut of an uuplanned outage, the turbine wicket gates would close within a few seconds followed <br />by ti�e gate ��lves on the penstock, and the slide gates a� the ou8et gipe would a�en. T�is paocess would <br />require only a few minutes, and urigati� flows would be un-intean�pted. I.hu�ing d�esigq wh�n mare <br />detailed tu�ine and gate data are available, the District would evatuate the potential for "water hauunes,,' <br />a condition caused by sudden increases in gressure. If theTe is a pot�tial for suc�h pressures, appropnate <br />miii�ati� measure�s would be designed to ensur� the safe operation of the dam a�d hydrapower plant_ <br />t)geration of the sinaller umt would be similar, althoug� it's linka�e w�uld aot be vcith the slide gates an <br />the rii9er autiet twt ratl�r with a vatve an the `�iver'' sid+e of ihe p�ant bifiuration. The pucpose of ths# <br />:=ah5e �auld be to prati�de fcx ritter releases d�ring time of outage or �ru�l ma�ntenance, <br />En;zroameatal �Cousiderations <br />Dissoh�eci gases in the m�er below the ouflet have been a grobiem, a�d incidenc�s of gas babble trauma <br />}�a��e beeu obsen�d in fish surveys below the dam Reclamatian co�l!u�+d that #t�e high le`�els of <br />disstahred gases are the result of the releases frrm� the dam I Some miti�ati� of the�e high levels of <br />dis�oh=�d gas could be adc�ssed tl�ro� clesign of th�e turbine equipment_ fihe Distnct would wark <br />closel� �►�th Rec�az►jation, the Cola�ado Division of QVilcilife aud o1�er a�cies to tyelp solve this <br />pc�ablem <br />� Di�ict does nat i��d to alter t�e ape�at�an of tl�e ri��r autlet ��odcs; imgarian and water svpPl}' <br />releas�es a�auld be made as they have been fat @ie past tv►en�t�� �ears- <br />I� c�onstru�ctia► and aperatio� the Disfrict aroutd e�lo}P best mana�t practic�s to manage <br />stacmmratet nmoff anci o8ier actioas that could Pateat�ally �act the n�er's a�si�r qualit}c <br />Coastraction <br />C.aaastruc�hian wo�ld occnr ove�r three phases_ <br />• F.quipc�ent gnocurenn�ent <br />• Facility conslcuction <br />+ Trausmis�i� and substation construction <br />Eq� Procur�euC �ouid be eaq�eaeted to b�egin eariy ia the � quaiter of 2012_ 'Iiie Dishict would <br />peepa� a pack�ge of bidding doc�rents and su�mit to se��erai q�al�fied bidders. It is anticip�ated tl�st this <br />p�ss �otild take at least four {4) mnnths, wrth aarand occwrin� sau�eti� late in 2012_ After award, <br />the ��encior �ould fabricate tlye �uipm�ent based � read�l�,� a��ble �_ Accordiug to information <br />���d 5+o�ti ��endors for this initial feasiUiiify anat��sis, be#a�een 10 a�d i� n�antlts w�uld be neqtnred <br />for equ�t d�eli�e�,'- £qucP�t tYPl�ally �cludes: <br />•°Pvu�o Fra�is Ttubin�s, horizontal arrangemeut —�e smaller sad a�e lacg�er turbiue <br />. �� A ��nt <br />• 1 sy-ncLranous �euerator per turbine <br />+ 1 h}rdraulic pow�ez unit (i�i� per t�u�bine <br />• 1 halrine s�►utoff valve per turbine <br />+ Imbedde�d p�s fa�r the iurbines a�d ge�erato�s, if reqiuc+ed <br />• S�ippmg to Project site <br />1 FrixeN, Kathlee� H., and Sechrist, luddson. September 2U06. Dissohred Gas and Fisheryy inv+estigations at <br />Ridgway Dam, FFnal Report. iiydraulic Laboratory Report HL 2006-03, IJS. Qepatiment of [nterior, Bueeau of <br />Reclamation. Technical Service Center, Water Resources Research La6acatory. �rner, Colorado. <br />Riclgway Flydrn Feasibi(ity Sunmary Page 4 <br />