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EARTH AND
ENVIRONMENTAL
ENGINEERING, INC.
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GEOTECHNICAL
ENVIRONMENTAL
MA TERlALS TESTING
MINERAL ASSESSMENT
ENGINEERING GEOLOGY
March 7, 1997
W.O. 159-CA
Barratt American
2035 Corte del Nogal
Carlsbad, California 92009
Attention:
Mr. David Jacinto
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Limited Geotechnical Investigation, r-r-' ~ : cr-RV\CES
Of~' P d T N 4400 ENG .!\I.-.-RINC ;:>.... -
Is1te a - ract 0., crrYOF ENC\N\TJ~~
Encinitas, California
Subject:
Reference:
Tract No. 4400, 9050-G, Sheet 13 of 13, by Dudek and Associates,
Inc., undated.
Gentlemen:
In accordance with your request and authorization, Earth and Environmental Engineering
Inc. is pleased to provide this limited geotechnical investigation of the subject site.
This report is specific to the area proposed as a borrow area pad, Tract No. 4400 as
indicated on the referenced plan prepared by Dudek & Associates,Inc.
This limited geotechnical investigation is based on review of available geologic data,
recent site reconnaissance, and our field exploration performed on June 12, 1996,
consisting of the exploration of four backhoe trenches to evaluate general subsurface
conditions. It is important to realize that site grading may encounter conditions which
vary from those described.
Summary of Site Conditions
The subject site is vacant and sits on a relatively gently sloping hillside. Site conditions
appear to be unchanged since our subsurface exploration other than burn off by the
recent fire. The subject pad area is underalin by relatively shallow bedrock of the
Santiago Peak Volcanics and possibly sedimentary rock of the Santiago Formation
covered with a variable mantle of topsoil. Plate 1 indicates the locations of test trenches.
Also enclosed are the Logs of the four test trenches excavated in the subject pad area.
It is our opinion, based upon our limited geotechnical investigation, that this report
presents a reasonable over view of general site conditions. Site development could
proceed in general conformance with the recommendations contained herein.
~
1045 LINDA VISTA DRIVE. SUITE 108 . SAN MARCOS. 92069
619-471-9505. FAX 619-471-9074
Offsite Pad- Tract No. 4400
Encinitas California
March 21, 1997
W.O. 159-CA
PAGE 2
RECOMMENDATIONS
Grading as proposed generally appears feasible. The recommendations offered herein
should be followed during site grading.
Site Clearing & Demolition
Areas to be graded should be cleared of vegetation at the beginning of site earthwork. If
large trees are present, where they fall in graded areas, removal will be necessary. Heavy
root zones may be present necessitating hand picking of roots during grading. Offsite
disposal of organics should be anticipated.
Removals & Corrective Grading
The natural soil mantle appears fairly thin, perhaps less than four feet. Some areas are
likely to have less than two feet of loose compressible soil. All loose and compressible
materials should be removed and recompacted in areas to receive fill or in structural
areas. We feel it likely that removals will vary from two (2) to four (4) feet.
Oversize Materials
It is anticipated that oversize rock materials will be encountered during grading.
Provisions should be made for hauling of oversize materials offsite. These materials
could be placed in fills ifbroken into should be considered. Refer to Grading Guidelines
for rock burial attached with this report.
Expansive Soils
Laboratory expansion tests were not performed on selected samples. However, our past
experience with similar soil types indicates that high expansive soils should be
anticipated.
Slopes
Typically, cut and fill slopes to the heights proposed, and of the types of materials
encountered on site are found to have acceptable factors of safety. Slope stabilization
due to adverse geologic structure is not anticipated. However, slopes in alluvium,
exposing excessive topsoil or if adverse geologic conditions are encountered, could
require corrective work.
Earthwork Construction
Earthwork Construction should be performed in accordance with the requirements of the
City of Encinitas, the Uniform Building Code, and our typical Grading Guidelines.
The Grading Guidelines outline the general construction procedures for earthwork
construction. Site specific situations and conditions often arise which are not discussed
in general guidelines, when anticipated these are discussed in the text of the report. The
£3
Offsite Pad- Tract No. 4400
Encinitas California
March 21, 1997
W.O. 159-CA
PAGE 3
Guidelines are intended to assist the contractor to more efficiently complete the project
by providing a reasonable understanding of the procedures that would be expected
during earthwork and the testing and observation used to evaluate those procedures.
However, unanticipated conditions often are encountered during site construction that
require additional evaluation and consultation.
Included within the Grading Guidelines is a section addressing "Job Safety" .
Utility Trench Construction and Backfill
Utility trench excavation and backfill is the contractors responsibility. The geotechnical
consultant typically provides periodic observation and testing ofthese operations.
While, efforts are made to make sufficient observations and tests to verify that the
contractors' methods and procedures are adequate to achieve proper compaction, it is
typically impractical to observe all backfill procedures. As such, it is critical that the
contractor(s) use consistent backfill procedures.
Trenches for all utilities should be excavated in accordance with CAL-OSHA and any
other applicable safety standards. Safe conditions will be required to enable compaction
testing of trench backfill.
1. All utility trench backfill in slopes, structural areas, streets and beneath all flat work or
hardscape should be brought to near optimum moisture and compacted to at least 90
percent of the laboratory standard. Neither flooding nor jetting is recommended for
native soils.
2. Care should be taken not to place soils at high moisture content within the upper
three feet of the trench backfill in paved areas, as overly wet soils may impact
sub grade preparation.
Construction Observations
This office should be notified in advance of any site construction including rough
grading, additional fill placement, regrading of the site, trench backfilling or retaining
wall backfilling.
Efforts will be made to accommodate all requests for field observations in a timely
manner and can usually be accommodated with 24 hour notice. However, at least two (2)
full working day advanced notice may be required to schedule our personnel for any
field observations, five (5) day advanced notice is needed for full time services. Failure
to provide adequate notice may result in our personnel not being available and delays to
the job progress.
£3
Offsite Pad- Tract No. 4400
Encinitas California
March 21, 1997
W.O. 159-CA
PAGE 4
POST CONSTRUCTION CONSIDERATIONS
Landscape Maintenance And Planting
Water has been shown to weaken the inherent strength of soil, and slope stability is
significantly reduced by overly wet conditions. Positive surface drainage away from
graded slopes should be maintained and only the amount of irrigation necessary to
sustain plant life should be provided for planted slopes. Overwatering should be
avoided.
Care should be taken when adding soil amendments to avoid excessive watering.
Leaching as a method of soil preparation prior to planting is not recommended.
Graded slopes constructed within and utilizing onsite materials could be erosive.
Weathering may increase the potential for erosion and or shallow slump features.
Eroded debris may be minimized and surficial slope stability enhanced by maintaining a
suitable vegetation cover. Plants selected for landscaping should be light weight, deep
rooted types which require little water and are capable of surviving the prevailing
climate.
An abatement program to control ground burrowing rodents should be implemented and
maintained. This is critical as burrowing rodents can decreased the long term
performance of slopes.
Drainage
The need to maintain proper surface drainage and subsurface systems can not be overly
emphasized. Positive site drainage should be maintained at all times. Drainage should
not flow uncontrolled down any descending slope. Water should be directed away from
foundations and not allowed to pond or seep into the ground. Pad drainage should be
directed toward approved area(s).
Positive drainage should not be blocked by improvements. Owners should be aware of
potential problems that could develop when drainage is altered through construction of
retaining walls, flatwork or other improvements. Even apparently minor changes or
modifications can cause problems.
It is the owner's responsibility to maintain and clean drainage devices on or contiguous
to their lot. In order to be effective, maintenance should be conducted on a regular and
routine schedule and necessary corrections made prior to each rainy season.
Additional Grading
This office should be notified in advance of any additional fill placement, site regrading,
£3
Offsite Pad- Tract No. 4400
Encinitas California
March 21, 1997
W.O. 159-CA
PAGES
or trench backfilling that occurs subsequent to any completed stage of site construction.
Footing trench spoil and any excess soils generated from utility trench excavations
should be compacted to a minimum relative compaction of 90 percent if not removed
from the site.
LIMITATIONS
The materials observed on the project site appear to be representative of the area;
however, soil and bedrock materials vary in character between excavations and natural
outcrops or conditions exposed during site construction. Site conditions may vary due
to seasonal changes or other factors. Earth and Environmental Engineering, Inc.
assumes no responsibility or liability for work, testing or recommendations performed or
provided by others.
Since our recommendations are based on the site conditions observed and encountered,
with no laboratory testing, our conclusion and recommendations are professional
opinions which are limited to the extent of the available data. Observation during
construction are important to allow for any change in recommendations found to be
warranted. These opinions have been derived in accordance with current standards of
practice and no warranty is expressed or implied. Standards of practice are subject to
change with time.
The opportunity to be of service is greatly appreciated. If you have any questions
concerning this report or if we may be of further assistance, please do not hesitate to
contact either of the undersigned.
Respectfully Submitted,
Earth and Environmental
,;
Enclosure:
Plate 1 - Geotechnical Map
Trench Logs
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&ASSOCIATES
Engineering,
Environmental Sciences and
Management Services
Corporate Office:
605 Third Street
619.942.5147
Fax 619.632.0164
Encinitas, California 92024
A California Corporation
Monday, March 17, 1997
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Blair Knowle
City of Encinitas
505 So. Vulcan Avenue
Encinitas, Ca, 92024
Re. AP.N.264-231-22
Dear Mr. Knowle:
I have reviewed the hydraulics and field conditions for the above Parcel and it is
my professional opinion that the proposed grading and lined drainage ditch
shown on the grading plan for said parcel do not substantially alter the natural
drainage patterns for the immediate area or pose an altered drainage condition
to the properties downstream of the proposed grading.
Sincerely,
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Gerald Hofmalster
Project Manager, RCE 20187
J # 860-50
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