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<br />lllth Streets, Preservation of the 100-year floodplain in the proposed park
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<br />Capital costs are higher than projected in the Phase A portion of this study for
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<br />the following reasons: (1) the cost of unit construction items have been
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<br />area is fully compatible with the recreational uses of the park,
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<br />from Coal Creek to the intersection of Emma Street and the Chicago, Burlington
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<br />increased by 10% due to inflationary conditions since the adoption of the
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<br />Phase A study, (2) the proposed design utilizes 100-year crossings at major
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<br />roadway sections and under the Chicago, Burlington and Quincy railroad tracks,
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<br />(3) larger grass-lined channels were needed than were expected during Phase A in
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<br />some portions of the drainageways and (4) a more detailed cost analysis of the
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<br />selected alternative plan was performed in the Phase B study effort.
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<br />Major Sub-Basin 3: Construction of a 10-year capacity, 4:1 grass-lined channel
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<br />and Quincy Railroad. The improvements included 100-year capacity culverts under
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<br />Flagg Drive and under the Chicago, Burlington and Quincy Railroad,
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<br />Major Sub-Basin 4: Recommend construction of a 10-year capacity, 4:1 grass-lined
<br />channel from Coal Creek to South Boulder Road, through the Boise Cascade yard
<br />and the upgrading of the existing channel from South Boulder Road to Marlin and
<br />Spaulding Streets. The improvements include a 100-year culvert at South Boulder
<br />Road and a 10-year crossing at Round Table Street.
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<br />capacity is increased to the 10-year frequency. The improvements include a
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<br /> TABLE 1
<br /> Summary of Project Costs
<br />D rawi ng Channe I Street Ut il ity Total Land Annua I
<br />Sheet Improvements Crossing Relocation Construction Acqui sition Maintenance
<br />No. Costs Costs Costs Costs Costs Cost
<br />2 $ 40,950 $ 17,122 $ 0 $ 58,072 $ 2,310 $ 860
<br />3 850,280 439,087 0 1,289,367 94,080 16,325
<br />5 130,025 0 4,400 134,425 12,700 2,210
<br />6 655,270 42,633 5,550 703,453 35,000 13,045
<br />7 871,700 52,500 0 924,200 42,600 12,450
<br />9 457,880 72, 932 3,050 533,862 46,300 10,125
<br />10 343,630 173,076 0 516,786 26,180 7,115
<br />11 269,115 0 1,550 270,665 27,780 5,810
<br />13 982,110 40,030 2,440 1,024,580 75,306 17 ,480
<br />14 497,060 20,541 3,750 521,351 34,200 8,100
<br />TOTAL $5,098,020 $857,921 $20,740 5,976,681 $396,456 $ 93,620
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<br />Major Sub-Basin 6: Upgrade an existing drainage channel east of the Centaur
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<br />Village sub-division, from Coal Creek to South Boulder Road, such that the
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<br />channel capacity is increased to carry a the 10-year flow. The improvements
<br />include a 100-year capacity culvert under South Boulder Road.
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<br />Majob Sub-Basin 7: Upgrading of the existing channel west of Centaur Village
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<br />
<br />subdivision, from Coal Creek to South Boulder Road, such that the channel
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<br />100-year capacity culvert under South Boulder Road.
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<br />35% Engineering & Contingency $2,091,838
<br />5% Legal, Fiscal & Administrative 298,834
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<br />The projected total cost of the Basinwide Major Drainageway Plan Improvements is
<br />estimated at $8,763,809, or an approximate equivalent of $3,000 per acre of
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<br />TOTAL COSTS: $8,763,809
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<br />land, which includes the costs for engineering, contingencies, land acquisition,
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<br />fiscal, legal and administrative expenses. A summary of the project construc-
<br />tion costs are given in Table 1, with a detailed description for each sheet
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<br />included with the drawings at the end of this report.
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