C150302 feas study

• Contract/PO #: C150302
• Contractor Name: WRCC, Inc.
• Contract Type: Loan
• County: Larimer
• County: Weld
• Loan Projects - Doc Type: Feasibility Study

Alternative 4— New ConduitAlong North Alignment
This alternative consists of a new inlet structure and RCBC conduit along an alignment to the north
of the existing aligntnent, and will require the acquisition of a new easement or a land purchase.
• Construct a new CIP concrete inlet structure off of the Poudre Valley Canal.
• Cut back ditch side slopes, reclaim the side slopes and fence.
• Construct a new CIP concrete inlet chute (approximately l OH: l V longitudinal slope)
and stilling basin
• Construct two (2) new four (4) foot high CIP concrete or grouted riprap drop structures
Figure 2 provides a plan of the different alternate alignments considered. Appendix B includes a
conceptual sketch of the alternative chosen. Table 1 provides a comparison of the different
alternatives and the pros and cons of each alternative.
Table 1. Alternative Comparison
Alternative Pros Cons
1 • Cost effective • Long term maintenance
• Requires minimal • Requires installation of
ROW/land purchase several drop structures
within the existing inlet
canal
2 • Provides for a more stable • Requires construction of
configuration than cast-in-place in existing inlet
Alternative No. 1 canal
• Less maintenance than
Alternative No. 1
3 • Abandons the de-graded • Requires new
section of the inlet channel ROW/easements and land
• Minimizes maintenance owner approval
• Channel conveyed • Requires new
4 completely in RCBC ROW/easement and land
• Minimizes maintenance owner approval
• Changes location of
discharge into Cobb Lake
4.0 PROBABLE OPINION OF CONSTRUCTION COSTS
Construction costs were based on estimated quantities of the various alternatives considered and unit
rates from similar recent construction projects within the region.
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