PROJ00077

• Contract/PO #: FS0008X
• Contractor Name: Longmont, City of
• Contract Type: Loan
• Water District: 0
• County: Boulder
• Loan Projects - Doc Type: Feasibility Study

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Equipment required at the construction site includes four pumps, three
small drilling rigs, three compressors, one shotcrete machine, two "hydraulic
grout plants, two generators, scaffolding, and miscellaneous hoses, rods and
tools. Materials required for construction include cement, sand, gravel, #8
bars and #4 bars. No toxic materials would be used in construction. A staging
area would be required near Copeland Lake. Cement and aggregate would b~ mixed
dry at the staging area and be lifted to the site in specially designed aluminum
containers. Helicopter support will vary but we envision a few flights will be
needed almost daily and continuous flying during 20 days.

IX. CONCLUSIONS
Based on the data gathered during this investigation and on its analysis
the following major conclusions can be drawn:

1. Bluebird Dam is in an advanced degree of deterioration as a result of
its severe temperature environment and original poor construction.
2. Geologic conditions at the site are favorable for an arch dam.
3. Concrete strengths range from high to very low. General concrete
quality ranges from excellent to very poor.
4. Major loading on the structure is tensional caused by extreme tem-
perature conditions. Compressional stresses are low because of the
\

sma 11 dam size.
5. A strong IIskeletonll of concrete makes the dam reparable as an arch
structure. A coherent load carrying and tension resistant arch can
be constructed using a combination of tensioned bolts, reinforced
shotcrete, and grout.
6. Equipment and manpower requirements for repair are small thus
environmental impacts can be kept at a minimum.

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