Gunnison - Orchard City Water Reservoir Project ‎(Remaining Tasks)‎_Application

• Basin Roundtable: Gunnison
• Applicant: Town of Orchard City
• Description: Water Reservoir Project ‎(Remaining Tasks)‎
• Account Source: Statewide
• Board Meeting Date: 9/19/2007
• Contract/PO #: 150410
• WSRA - Doc Type: Grant Application

9NC

SMITH WILLIAMS CONSULTANTS, INC.

December 18,2006
Proposal P06-078

Orchard City Res~rvoir Proposal for Engineering Services

· 60 gradations (ASTM D422)
· 6 Proctors (ASTM D-1557)
· 10 - 15 CD triaxial shear tests
· Direct shear tests (15 pts)
· 8 permeability tests (ASTM D5084-00, 3 pts test)
· 30 specific gravity tests (ASTM C-128)
· 30 hydrometers

Task A500: Final Design:

The Dam will be designed based on the results of the alternative analysis. The configuration will
be optimized, to the extent practical, to achieve the most cost effective safe design. Based on
discussions with Orchard City and the requirements of the State Engineer's Office (SEO) for
constructing dams the design will include, as.a minimum, the following:

· Determination of the probable maximum flood.
· Hydraulic calculations to determine the size of the emergency spillway.. Calculations for
the design of the overflow spillway and the loading conditions utilized.
· Design calculations to size the outlet structure. In addition, structural calculations used to
detennine the size of the concrete base mat and walls of the outlet structure. Calculations
will size all reinforcing steel in the base mat and walls.
· Hydraulic calculations for detennining the required depth and length of the spillway
stilling basin. Structural calculations for determining the thickness and amount of
reinforcement required for the stilling basin walls and base mat.
· Summary of the geotechnical investigation including logs of test borings and geologic
cross-sections.
· A ~mmary of material testing results and the location and logs of test pits.
· A summary of geological investigations consisting of: .
Regional perspective of the site~s geologic and seismic setting at a scale
appropriate to the geologic complexity of the area..
Seismic evaluation establishing the relationship of the site to all seismic features
of concern. .
Site geology of areas affected 'by construction activities and appropriate adjacent
areas.
Plans to compensate for any geological weakness in the dam foundation.
· Foundation treatment and abutment contact design.
· -Stability analysis of the structure using the computer program SLOPE/W or equivalent.
The stability analysis will consider different loading conditions such as post construction,
long term nonnal pool, rapid drawdown, maximum pool and seismic conditions.
· Seepage considerations consisting of a cutoff trench design, blanket drain and/or seepage
collection piping. .
· Design of the instrumentation for the dam.

S:\PROPOSALS\2006 PROPOSALS\PQ6.078 - ORCHARD CITY RESERVOIR\P06-078 -ORCHARD Clrf RESERVOIR.DOC

4