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HETHERINGTON ENGINEERING. INC.
GEOTECHNICAL CONSULTANTS
August 1, 1990
Project No. 507.1
Mr. Daniel Zulla
666 Union street
Leucadia, CA 92024
Subject:
GEOTECHNICAL FEASIBILITY EVALUATION
Proposed Two Lot Subdivision
1.0 Acre Parcel
666 Union Street
Leucadia, California
Dear Mr. Zulla:
In accordance with your request, we have performed a geotechnical
feasibility evaluation of the subject property. The scope of our
evaluation consisted of site reconnaissance, review of available
reports and maps pertinent to the site, and the preparation of this
report presenting our findings.
The following reports and maps were studied during our evaluation:
0 Pleistocene Faults and Marine Terraces, Northern San Diego
County, by Eisenberg, Leonard I., In, On the Manner of Deposition
of the Eocene Strata in Northern San Diego County, San Diego
Association of Geologists, Edited by Patrick L. Abbott, 1985.
0 Fault Map of California, by Jennings, C.W., California Division
of Mines and Geology, Geologic Data Map No.1, 1975.
0 Tentative Parcel Map of: 666 Union street,
Development Corporation, dated February 22, 1990.
by
Resource
0 Faulting in the Oceanside, Carlsbad, and Vista Areas, Northern
San Diego County, California, by Hannan, Dennis L., in Studies on
the Geology of Camp Pendleton, and Western San Diego County,
California, San Diego Association of Geologists, Edited by Arnold
Ross and Robert J. Dowlen, 1975.
SITE DESCRIPTION
The subject site consists of a rectangular shaped 1.0 acre parcel
of land that is presently occupied by one single-family residential
structure with accompanying yard areas and several trees. The
existing residence occupies the general southern half of the
5245 AVENIDA ENCINAS. SUITE G . CARLSBAD, CALIFORNIA 92008 . (619) 931.1917
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BASE MAP: USGS ENCINITAS QUADRANGLE
NORTH
SCALE: 1-=2000'
LOCATION MAP
HETHERINGTON ENGINEERING
GEOTECHNICAL CONSULTANTS
666 UNION STREET
PROJECT NO. 507.1
I FIGURE NO.1
..
8
GEOTECHNICAL FEASIBILITY EVALUATION
Project No. 507.1
August 1, 1990
Page 2
8
overall parcel and is presently being remodeled. The northern half
of the overall parcel, identified as parcel 2, is presently
undeveloped and contains a growth of seasonal weeds and grass and
several trees. The property is bounded by existing residential
properties to the north, east, and west, and Union Street to the
south (see Location Map, Figure 1). Topography of the site
consists of gently sloping ground that descends generally from the
northeast corner of the site down to the southern property boundary
and Union Street. Maximum topographic relief for the subject
property is approximately 14 feet, with elevations ranging from
approximately 176 feet to 190 feet above sea level.
PROPOSED DEVELOPMENT
It is our understanding that the existing residence within the
property will remain and that one new single-family dwelling will
be developed on the site. We assume that the new construction will
consist of a two-story (maximum), wood-frame structure founded on
conventional continuous/spread footings with slab-on-grade floors.
Grading is expected to be minor.
GEOLOGIC SETTING
Based on our review of available published maps and reports
pertinent to the subject site and vicinity, the subject property is
apparently underlain by terrace deposits of Pleistocene age which
are in turn underlain at depth by Eocene age Torrey Sandstone.
Based on previous work within the general site vicinity, the
terrace deposits that would likely be encountered during
construction would consist of clayey to silty sands.
The referenced reports show several northeast trending high angle
faults mapped several miles north of the site. One of these
features, the La Costa Avenue fault, is considered to be
potentially active. However, the trace of the La Costa Avenue
fault, or any of the other mapped faults, do not appear to traverse
the subject property. The most likely geologic hazard to
potentially impact the site as with all of southern California
would be ground shaking generated from earthquakes occurring along
one of several major fault zones in the region.
HETHERINGTON ENGINEERING, INC.
GEOTECHNICAL FEASIBILITY EVALUATION
Project No. 507.1
August 1, 1990
Page 3
CONCLUSIONS
Based on the results of our evaluation, proposed development of the
subject property is feasible from a geotechnical standpoint. There
are no known geologic conditions which would prevent development of
the site. The faults that have been mapped north of the site are
not considered to be a construction limiting hazard. In the event
that unsuitable soils such as old fill soils or topsoils exist
within areas of proposed development, remedial grading may be
necessary to prepare the site for construction.
Prior to the proposed development, a geotechnical investigation
including subsurface exploration should be performed to evaluate
site specific conditions, and to provide grading and foundation
recommendations for the proposed single-family dwellings.
This opportunity to be of service is sincerely appreciated.
have any questions, please call.
If you
Very truly yours,
BRANDON BOKA
Staff Geologist
MDH/ss
Attachment
HETHERINGTON ENGINEERING1 INC.