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REP03164
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REP03164
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Entry Properties
Last modified
8/24/2016 11:34:00 PM
Creation date
11/26/2007 10:26:00 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Report
Doc Name
STABILITY OF THE SPOIL FILL IN STREETER GULCH JULY 1978
Permit Index Doc Type
Waste Pile/Fill Report
Media Type
D
Archive
No
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to 1.3 horizontal). Theoretically, an embankment with such a slope would 6e stable <br />irrespective of its height. For practical as well as environmental reasons, however, <br />the outer slope of the completed embankment will be finished to a slope not steeper <br />than 1 vertical to 3 horizontal with the addition of a near level 30-foot wide terrace <br />at each 100-foot elevation. Flattening of the outer slope of the embankment will be <br />accomplished by dozers working the excess material in the upper portion of each lift <br />down the slope to fill in the lower portion as depicted on the section on Figure 1. <br />Again, no special compaction operations will be undertaken in this operation, apart <br />from that resulting from the operation of the grading equipment, in order to preserve <br />the free-draining characteristics of the embankment. As each section of the embank- <br />ment is graded to its final configuration, top soil will be spread over the outer face <br />following which revegetation will be undertaken in accord with the land reclamation <br />plan. Also, as each section of the embankment is completed to its final grade, the <br />relocated channel of Streeter Gulch, along the line of contact of the embankment with <br />the north abutment of the canyon, will be constructed to convey surface runoff to the <br />silt detention pond below the downstream toe of the embankment. <br />Golder Associates, Consulting Mining and Geotechnical Engineers, have made <br />an independent evaluation of the stability of the Streeter Canyon fill, the results of <br />which are contained in a companion report dated 8 June 1978. Those studies indicate <br />that under the most critical conditions regarding strength of materials, including com- <br />plete saturation of the embankment, the fill will have an acceptable factor of safety <br />against mass movement. In the Golder studies, the assumption of complete saturation <br />was made primarily for illustrative purposes, and as mentioned earlier it would be <br />physically impossible to completely saturate the Streeter Canyon fill. From the results <br />of Golder's stability analyses, it is considered that the factor of safety of the embank- <br />ment against sliding or other mass movement is at least 1.6, or a degree of stability <br />greater than normally considered necessary for high dams impounding large reservoirs. <br />The true factor of safety of the embankment against major movement is probably in the <br />order of 2.0 or greater. The boundary conditions imposed by the irregular contours of <br />7 <br />
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