HomeMy WebLinkAboutOC_RS080403 - Soils (2)McMONIGLE RESIDENTIAL GROUP
February 28, 2005
J.N. 115-04
Page 9
Any modifications to the project grading plan should be reviewed by this firm with respect
to the geotechnical aspects of the proposed development. Additional recommendations
and/or modifications may be necessary.
Primary Geotechnical Concerns
The only significant geotechnical concern for the site is judged to be long-term global
stability of the proposed slopes. Long-term slope stability is discussed in the Earthwork
section of this report. The potential for slope creep is discussed below.
Potential for Slone Creen
Although the onsite soil and bedrock materials generally exhibit a low to very low
expansion potential, there still exists the probability of the development of a minor creep
condition on the surround descending slopes with the passage of time.
In general, a slope creep condition developing to a depth of approximately 3 feet deep can
be anticipated on the adjacent descending slopes. Therefore, new structures proposed on
the site and within approximately 10 feet of the top of the descending slopes may need to
be supported on deepened footings in order reduce the potential adverse effects of slope
creep.
Based on the enclosed site plan (Plate 1), the proposed residence is set back a sufficient
distance from the top of the descending slope such that it is not expected to be affected by
slope creep. However, the retaining wall proposed along the southeastern sides of the
property should be supported on deepened footings to mitigate the adverse effect of slope
creep. Recommendations for design and construction of the foundations for this structure
are provided in the subsequent "Retaining Wall Design Recommendations" section of this
report.
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