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<br />00 <br /> <br />" <br /> <br />recombined diecharqe to an improved ditch on the ea~t side Of Alice Avenue. <br />The dralna..e ditch "",uld run 40 f"et no:rth to a 48-inch reinforced cone rete <br />pipe directed north~e5t under the Cherry Street and Alioe Avenue intersection <br />to an open channel on the west aide of Alice Avenue. Thia channel would con- <br /> <br />Table 9. Western flow ~ath Alternative 2 Summary of COet Eatimdte. <br /> <br />It".. <br /> <br />Quantity <br /> <br />Unit Cost <br /> <br />Totaleost <br /> <br />vel' the flow to a Thompson and Platte Ditch eroe..ing and on north to the Big- <br />Thompson River. <br /> <br />Curb inlet and eump <br /> <br />240lf <br /> <br />sso.oo/l! <br /> <br />$12,000 <br /> <br />1'.lternatlve3(Flgure23)wouldcarrythediachargefrOlllthedetention <br />pond to the ditch north of Highway 60 and eaat of hIlee Avenue via a 54-inch <br /> <br />Three48-inchRCP <br />lwith outlet protection) <br /> <br />SOlf <br />each <br /> <br />$85.00/lf <br /> <br />20,000 <br /> <br />reinforced concrete storm sewer. From the ditch, flow would be conveyed in <br />the same m3nner as Alterantive 2. <br /> <br />Channel fr~ County <br />ROlld 46 3/4 to <br />Highwlly60 <br /> <br />600lf <br /> <br />$5.00/lf <br /> <br />3,000 <br /> <br />ImproV9ment Costs <br />The development of =nstruction coots for the alternative 1I!Iprovement <br />plans wao based on unit costs obtained from .1981 Cost Data" (reference \2) <br /> <br />Thompson end Platte <br />and Beeline Ditch <br />crouing <br /> <br />, <br /> <br />Lump Sum <br /> <br />15,000 <br /> <br />Total Construction Cost <br /> <br />$50,000 <br /> <br />COllIpiledby the Costs Eatimates Sq~dofthe Staff OesignBrarlCh, Colorado <br /> <br />Department of Highways, January 1, 1982. <br /> <br />Costs""re4asumedtoadequ.ately <br /> <br />Engineering and Contingencies <br />(30 percent of construction costal <br /> <br />15,000 <br /> <br />represent 1982 constructon costs due to the recessed economy over this periOd. <br />All unit costs include labor and overhead for the construction item. Included <br />in the cost estimates are coats for ldnd acquisition and legal, administra_ <br />tive, contingency, and engineering fees. Land acquisition costs ~re inflated <br />from ~ld County Assessor's 1973 valuation. Annual operation and maintenance <br />ware $0.60 ~r linear root for vegetated channel, $0.26 per linear foot for <br />natural channels, and $72.00 per surface acre tor detention ponds. <br />~he detailed quantity and cost estimates for each alternat1YQ ~e pre- <br />sented in the ~chnical ~ddendum. Tables 9 through 20 summarize the estimated <br />oosts tor each improvement alternative. The summary tables inolude total <br />coets, annual coste, annual operation and ~interlance, and total annual costs. <br />Annual costs are bas~d on a 50-year projeot life with a 7-3/8 percent discount <br /> <br />Legal, ~isoal and Administration <br />15 percent of construction, engineering and <br />contingenoies, and land costs) <br /> <br />3,000 <br /> <br />T<l'tAL COS1' <br /> <br />$68,000 <br /> <br />Annual Cost <br />(50-year servioe lite, 7-3/8 percent) <br /> <br />$5,200 <br /> <br />Operation and Maintenance <br /> <br />,"0 <br /> <br />TOTAL ANNUAL COST <br /> <br />$5.400 <br /> <br />rate. <br />