WSPC06079

• File Number: 8064.100
• Description: Ute Tribes
• State: CO
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 6/1/1987
• Author: Boyle Engineering
• Title: Agricultural Engineering Study - Mancos Watershed - Task D-E - Final Report - Design-Cost Estimate for Off-Farm Irrigation Facilities and PIA Determination
• Water Supply Pro - Doc Type: Report/Study

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estimated based on average depths of excavation for the respective

lengths. Grouting quantities were estimated for holes 10 feet on-

center drilled to a depth of 30 feet below the assumed bedrock

sur face, and us ing an assumed 0.5 bag of cemen t per foot for grout ing.

Work item unit costs were estimated from an analysis of actual

construction costs of ten comparable dams constructed within the

last eight years. These included eight embankment dams with various

river diversion programs, embankment heights and slopes, grouting

programs, foundation preparation programs, and bid item break-

downs. The unit costs were escalated to estimated early-1987 price

levels and were adjusted to reflect the effect of the remoteness of

the construction site.

Preliminary cost estimates for both sizes of reservoirs are

contained in Appendix D.3. The costs of the major work items were

calculated as the product of the estimated quantities and unit costs.

Twenty-five percent of the total cost of the major work items was

added as an allowance for unlisted items and construction

contingencies to obtain the estimated Contract Cost. Engineering

and construction administration costs of 20 percent of the Contract

Cost were then added to obtain the total Construction Cost. To this

was added interest at 8 3/8 percent during an assumed 2-year

construction per iod to obtain the total Capi tal Cost for each

reservoir.

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