PROJ00345

• Contract/PO #: C153330
• Contractor Name: Upper Yampa Water Conservancy District
• Contract Type: Loan
• Water District: 0
• County: Routt
• Bill Number: SB 77-35
• Loan Projects - Doc Type: Feasibility Study

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Specification
Page or Draw-
ing No.

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P. 121

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P. 137

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Pp. 138-142

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P. 140

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P. 141

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Clay grout is permitted in drains and sumps. Due to the re1a-

tive1y high gradients in this area after reservoir filling,

cement grout should be required.

No minimum limit is specified for Zone 1 fines content. After

inspecting the proposed source (spillway excavation) this

limit appears unnecessary, provided Zone 1 is consistently

more impervious than Zone 2. This may require selective load-

ing and placing at times during construction.

Specs cai1 for both method and end result on compaction. The

specified limits on moisture content and minimum relative

compaction requirements are considered entirely adequate to

obtain a good end result. The requirement for number of passes

should be eliminated and roller specifications worded to permit

approved substitutes for the tamping roller (See note for

P. 141). These changes will simplify inspection and may reduce

bid prices.

Specs referring to density control are not realistic as they refer

to limits normally applied to moisture.

The requirement for a tamping roller for Zone 1 is controversial.

Materials containing gravel and cobbles sometimes cause inter-

ference with tamping feet, resulting in poor compaction. Main-

tenance problems usually arise with a single tamping roller

as the feet wear down and are no longer effective. It is

recommended that a 50-ton pneumaticmtired roller and 10-inch