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<br />12. A grass-lined channel followed by a concrete-lined channel
<br />with 100-year design capacity from the Marston Lake
<br />caretaker's house access to old Wadsworth.
<br />
<br />preliminary design such as jacking a 84-inch RCP under Colorado State
<br />Highway 121 and providing a concrete box culvert bridge at Sheridan
<br />Boul evard.
<br />
<br />13. A convert with 5-year design capacity at old Wadsworth.
<br />
<br />TABLE 1
<br />
<br />14. A concrete-lined channel with 100-year design capacity from
<br />old Wadsworth to Colorado State Highway 121.
<br />
<br />SUMMARY OF TOTAL COSTS
<br />
<br />15. Addition of a pipe at Colorado State Highway 121 to pass 100-
<br />year flood.
<br />
<br />Plan and
<br />Profil e
<br />Sheet No.
<br />
<br />Channel
<br />Improvements
<br />Costs
<br />
<br />St reet
<br />Crossing
<br />Costs
<br />
<br />Util ity
<br />Relocation
<br />Costs
<br />
<br />Property
<br />Acquisition
<br />Costs
<br />
<br />Total
<br />Improvement
<br />Cost
<br />
<br />Annua 1
<br />Maintenance
<br />Cost
<br />
<br />16. A sediment settling pond capable of containing 2-year I-hour
<br />storm runoff upstream of Colorado State Highway 121.
<br />
<br />4 $ 68,900 $ 0 $ 0 $ 19,800 $ 88,700 $ 200
<br />5 308,300 0 0 105,000 413,300 1,200
<br />6 361,300 327,500 4,900 135,000 828,700 1,000
<br />7 620,500 0 0 63,000 683,500 1,200
<br />8 628,200 23,800 8,400 120,000 780,400 1,760
<br />9 383,500 0 0 21,000 404,500 600
<br />10 22,300 321,000 13,400 0 266,700 100
<br />11 230,600 6,600 0 45 ,000 282,200 500
<br />TOTAL $2,623,600 $588,900 $26,700 $508,800 $3,748,000 $ 6,500
<br /> Present Worth of Maintenance $95,700
<br />
<br />17. A grass-lined channel with 100-year design capacity from the
<br />sediment settling pond to the east boundary of Park West 3
<br />subdivision.
<br />
<br />The projected total cost of Master Plan Improvements is $3,748,000,
<br />which includes costs for engineering, contingencies, land acquisition,
<br />fiscal, legal and administrative expenses. The present worth of the
<br />annualized operation and maintenance costs (50 year, 6-1~ percent) are
<br />estimated at $95,700. A summary of these costs is given in Table 1.
<br />A full breakdown of these costs is presented with each of the plan
<br />and profile drawings at the end of this report.
<br />
<br />The capital cost of these drainage and flood control improvements is
<br />higher than that presented in the Phase A report because (1) the cost
<br />in the Phase A report was based on 1978 unit cost and the cost in the
<br />prel iminary design phase is based on 1979 unit cost, (2) this prel imi-
<br />nary design has investigated all proposed facil ities in more detail,
<br />(3) all grass-lined channels are designed with more width-to-depth
<br />ratio for easy maintenance and therefore increase the rights-of-way
<br />cost, (4) several facilities are added in this preliminary design such
<br />as the concrete-lined channel through the Marston Sump, and a culvert
<br />under old Wadsworth, (5) several facilities have been modified in this
<br />
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