PROJ00402

• Contract/PO #: C153517
• Contractor Name: Lone Cabin Ditch and Reservoir Company
• Contract Type: Loan
• Water District: 40
• County: Delta
• Bill Number: SB 87-15
• Loan Projects - Doc Type: Feasibility Study

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vertical and the proposed slope will be constructed at an

inclination of about 2.5 to 1.

Our scope of services did

not include a field or laboratory study of the existing dam

embankment or a site visit.

We were requested to perform

our stability analysis based on shallow slope stability of

the proposed material to be used as fill to flatten the

existing slope.

The requested scope of our work did not

include deep stability analysis or gross stability

analysis of the existing or modified embankment.

SLOPE STABILITY

The stability of any slope is dependent on many factors.

Typically the stability of a slope is analyzed by calculating

the anticipated gravitational forces that tend to drive the

mass of soil downhill and the anticipated internal strength

of the soil along the expected plane of failure that will

resist the downhill movements.

If the driving forces are

greater than the resisting forces then failure is imrninent~

Failure can occur as slow deformation, creep or a somewhat

spontaneous failure.

Factors that influence slope stability can generally

be classified as those that increase the stress (driving

forces) on the system or those that decrease the strength

(resisting forces) of the soil.

Factors that increcse the

stress may be increased soil weight by wetting or steepening

the face of the slope.

Factors that decrease the strength

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CONSULTING GEOTECHNICAL ENGINEERS AND
MATER1"l TE::STIHG