PROJ00455

• Contract/PO #: C153583
• Contractor Name: Ute Water Conservancy District
• Water District: 0
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

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Section II (from Station 737+50 to 754+00)
The subsurface conditions along this section can be characterized by a layer of
alluvial and colluvial deposits consisting of coarse grained sand, gravel and boulders
overlaying the sandstone bedrock. The depth to bedrock is estimated to be greater
than IO feet below the existing ground surface. Large boulders are present on the
surface along this section, therefore it should be expected that they will occur in
subsurface material also. Groundwater along this section at the proposed pipeline
excavation depth is anticipated to be non-existent.

Section III (from Station 754+00 to Station 754+60)
The subsurface conditions along this section consist of embankment material used
in construction of the 1-70 off ramp to S.H. 65. The embankment material is
anticipated to be similar to natural soils encountered along section I and II. The
highway department personnel indicated that there is the possibility for large
boulders to be present in the embankment material. It is anticipated that no
groundwater will be encountered along this section at the proposed excavation
depths.

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Section IV (from Station 754+60 to 762+10)
The subsurface condition along this section consists of fine grained flood plain
alluvial deposits consisting of fines and silt overlaying sandstone bedrock. The depth
to bedrock is estimated to be more than 30 feet below the existing ground surface.
Due to the close proximity of Plateau Creek the depth to groundwater is expected
to be shallow. The subsurface materials are anticipated to be saturated and soft
without proper compaction. The area along Plateau Creek contains dense to very
dense growths of riparian vegetation.

Section V (from Station 762+ 10 to Station 764+05)
The subsurface condition along this section consists of embankment material used
in construction of 1-70 bridges over Plateau Creek. The embankment material is
anticipated to be similar to natural soils encountered along section I and II. There
is the possibility for large boulders in the embankment material. A series of
exploratory borings were drilled by CDOH prior to construction of the 1-70 bridge
at this area. The subsurface condition encountered by these borings indicates that
the subsurface material consisted of layers of sand and gravel over sandy silt, over
sand, gravel and boulders. These materials in turn overlaid the sandstone bedrock.
Groundwater along this section is estimated to be 3 to 5 feet below the existing
ground surface at the proposed pipeline location.

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