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I I I I I I I I I I I I I II I I I II I -22- The existing 5' x 3' concrete box culvert at Easley Road should be replaced with a triple 12' x 3' reinforced concrete box culvert in order to pass the 10-year discharge. Dikes upstream and downstream from Easley Road should be constructed along the north bank of the channel in order to eliminate the shallow flooding area between the main channel and the South Tributary. This will be necessary as development increases. Approximately two acres of right-of-way must be acquired prior to the construction of these dikes. 3. Drainage - improved channels and special facilities including check dams, drop structures and channel lining, such as grass, concrete or rock. Also includes irrigation channel crossing costs. 4. Reservoirs - embankment and spillway costs The Church Ditch crossing should be improved with the construction of a triple 12' x 5' concrete box culvert. Approximately one acre of right-of-way must be obtained for this improvement. Construction costs have been estimated on the basis of using normal construction materials and construction techniques for the construction of the proposed improvements outlined on the preliminary planning drawing. Alternate types of materials may be available at the time of design and construction which would permit possible savings in the actual construction costs. The evaluation of alternate materials should be made at the time of final design. - COSTS - The unit costs used for preparing estimates are listed in Table IV. the preliminary plan cost Miscellaneous costs not noted 1. Construction costs 2. Contingency costs: 15% of (1) 3. Engineering and construction services costs: 10% of (1) + (2) 4. Right-of-way costs 5. Legal, fiscal and administrative costs: 12% of (1) +(2) + (3) + (4) 6. Operation and maintenance costs in this table are based on the cost data published in the 1975 cost data book prepared by the Colorado Department of Highways (Ref. 9). Cost information was also obtained from recent construction bids for drainage facility construction projects in Denver and Lakewood. The construction costs are estimated to be representative of June, 1976 costs, and an ENR construction cost index of 2090.26 (1913 = 100) for Denver. The estimated costs for this project are described in the following paragraphs. The total project cost is estimated from the normal project cost items listed below: 1. Utilities - relocation of gas, water sewer, telephone and other utility facilities. 2. Traffic - culverts and bridge improve- ments, including all ancillary facilities such as headwalls, wingwalls and energy dissipation structures. These costs have been estimated using the reported unit costs and an itemized estimate of facility quantities taken from the preliminary plans. A summary of these quantities and costs extensions is provided in the Cost Estimate Addendum for Van Bibber Creek, on file with the UD&FCD. For further consideration, the total project costs are identified in the four cost categories listed below: