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. 141 cont.

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P. 147

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P. 147

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lifts be permitted as an alternative for Zone 1, provided

scarification is required whenever the fill surface becomes

too smooth to provide a good bond. This provision could save

money as some contractors do not have the specified tamping

roller and because compaction by pneumatic roller is normally

less expensive. One pneumatic, tired roller should have

sufficient capacity to compact both Zones 1 and 2.

Specs for density control of filter material are same as for

Zone 1 (Proctor). This test procedure is not as well suited

to pervious granular material as is the relative density test

(U,S. Bureau of Reclamation, designation E-12). It is recom-

mended that the filter material be compacted either dry or

thoroughly wet, using a track-type tractor, a l2-inch lift,

and 3 complete passes. (See P. 180 and 181 of the Bureau

of Reclamation Earth Manual.) This material should compact

readily to at least 70% relative density. Density tests should

be made to verify this minimum but the specifications should be

method-type in the case of filter material,

The riprap specifications do not, appear to insure adequate

quality or size of rock for long-term slope protection, The

sandstone and shale observed at the site are not believed to

be very durable and substantial percentages of this material

would be unsatisfactory. To obtain suitable size, especially

on the steeper 2:1 slope, a minimum percentage by weight larger