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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The soils tested during our laboratory study were de-

livered to our laboratory by Mr. Leroy Black.

The soil strength

characteristics used in our analyses were determined for

s~turated conditions on remolded samples.

Saturation is tlle

condition whe_n the soils will be at their weakest state and the

~ore pressure will be greatest.

The samples tested were re-

molded to about 98 percent of the maximum dry density defined

by ASTM D698 standard Proctor, as requested by Mr. Black.

CONCLUSIONS AND SUGGESTIONS

Based on our laboratory tept results of the material

delivered ~o our laboratory, on our stability analysis and on

our understanding of the proposed construction, we anticipate

that the calculated factor of s~fety for the stability of the

shallow fill will be about 1.8.

This factor of safety assumes

that the existing slope is at an inclination of at least 2

horizontal to 1 vertical and that the slope will be flattened

by placing compacted fill to an inclination of at least 2.5

horizontal to 1 vertical.

We suggest that the compacted fill be constructed such that

the fill is keyed into the existing material at the toe at

least six (6) feet into competent material and benched into

competent existing embankment material at least three (3)

feet.

A toe drain should be constructed at the back of the

toe key.

The toe drain should consist of a three (3) or four (4)

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CONSUL TI...G GEOTECHHIC-'l EHGINEERS AND
MATERIAL TiSTlNG