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<br />o <br /><.> <br />>- <br /> <br />co <br /> <br /> <br />1<.:ast Portal - Alva. B. Adams Tunnelo <br /> <br />When the two headings met under the Contlrumtal. D1 vide, the <br />difference in alignment and gr'ftde closure could be covered by a 25- <br />cent piece. Temperatures in the twmel varied ......ith the depth or <br />ground cover--maximum approx~tely 4,000 feet--and ranged from <br />46.40 F. near the portals to a high of 76.60 F. six miles in from <br />the east portal. Constructed on a slope of .00155 for a difference <br />of 107 feet in elevation bet......een portals, the tunnel Is concrete- <br />lined throughout and has a capacity of approxi1na.tely 355 million <br />gallons per day. Construction required )08,563 cubic yards of <br />excavation, 4,280,728 pounds of steel, and 124,411 cubic yards of <br />concrete. Tunnel flo~s are regulated by two 9-foot by IO-foot <br />radial gates operated fram the gatehouse at the ~st portal or by <br />reJ::lote control .from the Granby Pumping Plant. <br /> <br />Excavation f'rGI.:1 the east portal r~quir~d 3 7~ months, an average <br />of 1,146 f~~t being driven each month. Tho ..est portal contractor <br />,;orked 31 mont.hs end averaged 833 feet per month. A maxiI:1um of 74 <br />feet was driven in one 24-hour period. <br /> <br />A gmall reservo~' at the east portal serves as a stilling pool <br />to regulate tunnel discharges prior to tho::1r rel.ease into thtt Estes <br />Park Aqueduct and Power SysteI:l at the Aspen Creek Siphon. <br /> <br />A pipe-enclosed electrical conduit suspended fr~ the tunnel <br />roof above the nOl~ water surface COnnBcts Eastern and Western <br />Slope tran~~ission circuits of the project. This conduit consists <br />