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<br />vU~.V~ GVV~ l~:lO ~V~~OOlVOV <br /> <br />uVLU~R ASSOCIATES <br /> <br />#1190 P,002l00B <br /> <br />Golder A5600lates 'no. <br />44 Unlon Bo'JIevord, S<Jtle 300 <br />lo~ CO USA 80228 <br />Telephone: (3031 960-0540 <br />Fax: 13031 966.20eO <br />www.golder.com <br /> <br />.~ <br /> <br />July 9, 2fJ04 <br /> <br />Our Ref.: 033-2135 <br /> <br />I <br />Beaver Reservoir Comparl~ <br />1404 4100 Road I <br />Paollia, Colorado 8 1428 ! <br /> <br />; <br /> <br />Atterltion: Mr. Cecil hrns~ <br />i <br />RE: IMPROVEMENlj ALTERNATIVES <br />COUNTY, COL~DO <br /> <br />AT 8EA VEil RESERVOIR, GUNNISON <br /> <br />, <br />. <br />. <br />i <br />! <br />This letter presents aJtematives lor (he improvcrl1erll~ to the intake gate structure at Beaver Reservoir. <br />We have prepared an initi~1 cost estimate and 3 I,rclimillllry sketches describing the clIm:nl design. <br />The project cost estimate ob the attached bibles I ~md 2 ~lssurnes the selected alternatives as described <br />below , ~ <br /> <br />Dear Cecil: <br /> <br />The Ea.~ fork of Minneso$s, Creek was c.lbserved In hllv~ ahout 2 cis or now when a site visit was <br />made in lare September of 2003, and "he stn:am is reported by Jim Norneet llIId YOl)rSelf ttl he 8. <br />perennial stream. Therefoi' some variety (If (;(Jner dam will need (0 be consfrm;~ in order 1.1) create <br />a dry working environme amund the existing inhtkc ~lructlJre. We have anticipated an earth fill <br />dam thllt also provides a w rking platform near the structure, ;t'i shown in the first sketch, <br />i <br />It is estimated that the cc.Jsllof pumping dlC collected waterll from the corTer dam will be about $7000 <br />per week for a 6" pump ~...p.....ble of RO teet of helld IJnd assucitllCd intake lll1d outlet pipe, An <br />altemative is to decant thelwaler through the 12" pipe which will be abandoned upon completion of <br />me gate, This is estimated tf) co~1 nQ more tl1an S2S00 including pfocemenl ora 12" diarnder decant <br />from the cotTer dam to lh~ex.iSling 12" diameler opening in the exisling outlet structure. Since it is <br />projected to take at least a eek to cunstruc[ the new gate, the decant option is the best choice 8t this <br />stage, Depend-ins. on the ow rates, a lemporary packer sellll11ay be required to prevent water from <br />Dowing backward from tI connecting 'V' lx:hind 'he existing structure (where the 12" diluneter <br />outlet meets the 24" di,une r outlet). , <br />I <br />Regarding the slope stabi/izatiun ~m)rl. the hesl opprlUlch involves firsl mucking out around the <br />exiting intake structure, th!n raising the intake invert level of the structure lip about 10 fe-ocl. Tllis is <br />followed by controlled J)lkemenf. of onsite till mllleri,.1 around the structure and slighlly up the <br />slopes. A second approllcij using locally uvailublt; ha$lJII. rock as a till around the slruclurC increases <br />the cost but providelf a mdrc stable structure obove the inr.ake gate. llle relotive unit CUSI.s ur each <br />material type an: cstill111ledhn be $25,00 per cubic Y:lrflllJr lf1c basalt ond $5,50 fOf the on5ite rill. The <br />full evaluation or these alt4rnlltives wiJI have to wuillll1,i1 R sl.ahilily analysis e....n be c:omplclc...d. The <br />cost estimate on tables I arid 2 represent the onsi'e till ClJ'llinn. <br />I <br /> <br />for the gate structure il~Jr, nUltlcmus design alternatives wcre explored at previous meetings <br />between Golder and Bellvt Rc,;~rvoir. aud between Of)ldcr and SM&RC (!>1ructIJral engineering sub <br /> <br />I <br />! <br />! <br />I ..._. <br /> <br />OFFICES ACROSS k:RICA. ASIA. AusmAUA, EWOP(, NORTH AMERICA AND SOUTH AMERICA <br />