HomeMy WebLinkAboutCT 73-18; Carrillo Estates; Soils Report; 1975-06-24,!y ;<a-’
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WOODWARD-CLYDE CONSULTANTS
CONSIJLTING ENGINEERS. GEOLOGISTS AND ENVIRONMENTAL SCIENTISTS
WESTERN REGION
3467 Kurtz Street
San Diego California92,10 June'24, *_-- IYl3
Project No. 73-203
Phone (714) 224-2911
Ponderosa Homes, Inc.
2082 Business Cent-r Drive, Suite 100
Irvine, California 92664
Attention: Mr. Terry Teeple / I 6’ 13
ADDITIOIJAL SLOPE STABILITY ANALYSES
CARILLO ESTATES
CARLSBAD, CALIFORNIA
In accordance with the request of Mr..Norm Arndt of Rick Engineering
Company, we have reviewed the grading plans for the proposed Carillo
Estates to be located approximately 1 mile east of'E1 Camino Real, and
1 mile south of Palomar .Airport Road in Carlsbad, California.
The purpose of our review is to determine if the grading plans were prepared
in accordance with the conclusions and recpmmendations in the preliminary
soil report entitled "Soil Investigation for the Proposed Carillo Estates,
Carlsbad, California", dated September 7, 1973, prepared by Uoodward-
Gizienski &'Associates.
The undated and untitled grading plans provided us were prepared by Rick
Engineering Company. They indicate that 2:l inclined slopes, having maximum
heights Df 66 and 120 feet for cut and fill slopes, respectively, are
proposed. Six foot benches are provided in fill slopes on 30 foot intervals
which results in somewhat flatteroverall slope inclination of the major
slopes. It was also noted that most of the higher slopes will be formed
by filling canyon areas at the northeast and southwest portions of the
site, hence confining the fill.mass. There are also l-1/2:1 inclined
cut and fill slopes having respective maximum heights on the order of
25 and 20 feet. As a part of the preliminary soil investigation, analyses
were presented for cut and fill slope with heights and inclinations of
bless than 50 feet and l-1/2:1, respectively. Analyses of fill slopes
inclined on 2:l indicated allowable heights on the order of 115 feet.
No analysis was made for 2:l inclined cut slopes.
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Ponderosa Homes, Inc. Page 2
Project No. 73-203 .I t -~ June 24, 1975
Two slope conditions are not covered by the preliminary report: The
2:1 fill slope exceeding the allowable 115 feet height by 5 feet, and
the 2:1, 66 foot high cut slope.
In the case of the higher fill slopes, a review of our slope stability
calculations indicates that the added 5 feet in height does not significantly
effect the indicated factor of safety against deep-seated slide failure.
The recommendation for use of special materials in the lower portions
of these high fill slopes should be observed.
In the case of the 66 foot high 2:l cut slope along the prDpDSed access
road, a review of our data concerning the geologic conditions in this
area indicates that it will be underlain by Santiago Peak volcanics in
the lower portion of the slope, and dense sands of the Delmar formation
in the upper portion of the slope. It is our opinion, provided the condition
of the rock is sound, that the slope will have an adequate indicated
factor of safety against deep-seated slide failure. It is recommended,
however, that the slope be inspected during and at the close of grading
by an engineering geologist from our office to determine the actual geologic
conditions. If adverse soil or rock conditions are encountered, such
as badly fractured rock, clay seams or water seeps, buttressing of the
slope may be required.
.If you have any questions concerning our additional slope stability analyses,
please call or write the engineer assigned to this project, Mr. Richard
P. While of our firm.
WOODWARD-CLYDE CONSULTANTS
LJL/RPW/jr
(2) Ponderosa Homes, Inc.
(1) Rick Engineering Company
Attention: Mr. Norm Arndt
WOODWABD-CLYDE CONSULTANTS