1990-493 G/H
7 f (~C;
Category
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Name
~
recdescv
Plan ck. #
Street Address
I
;) 1-1 r;; {1
Serial #
I
Description
Year
CONWAY & ASSOCIATES, Inc.
Civil Engineers / Surveyors / General/Engineering Contractors
135 Liverpool Dr., Suite A
Cardjff-by-the-Sea, CA 92007
Telephone: (619) 753-1453
Fax: (619) 753-4158
City of Encinitas
Attention: Building Department
535 Encinitas Blvd. Suite 100
Encinitas, California
November 19, 1991
RE:
Pad & Slab Certification - Remodel
Horst Residence - Encinitãs
Gentlemen,
This letter is to certify that on November 19, 1991, at the
request of the owner, Mr. Curt Horst, the slab and adjacent
rough grade for the subject structure were surveyed "as-built"
per the certification statement as annotated below.
Our firm provided the grading plan for the subject.
The approved plan was available to us on-site and was used in
the determination of the following grade and structure
elevations.
All construction work was provided by others.
We have not set any grade stakes, boundary stakes or other
control for this project and make no representations whatsoever
other than the specific statement as follows:
Certification Statement: I performed a vertical check only on
the: existing slab; proposed basement slab; rough grade
immediately adjacent to the South of the proposed basement
slab. I state herein that all of these elevations are as per
the abovenoted plan.
Please call with any questions.
cc
Curt Horst, owner
file
Jon Blake
L.S.4368
Expires 0 9írŒ9~ U 'Ill Œ ill
ill NOV 2 6 1991
CITY OF ENCINITAS
DEPT. OF PUBLIC WORKS
ENGINEERING DEPT.
BARRY AND ASSOCIATES
GEOTECHNICAL ENGINEERING
p,o, Box 348
Encinitas, CA 92023-0348
(619) 753-9940
November 22, 1991
subject:
COMPACTION TEST RESULTS
Garage Wall Backfill
1058 Third Street
Encinitas, California
íõ) Ii ~ Ii ~ ~ 1i\ID
Uù NO\} 2 6 1991
F ENCINIIAS
CIIY 0 LJBLlC WORKS
DEPI. OF P
EJ~G\tit.t.R\tiG t)t.Pl.
Mr. C ur tHo r s t
1058 Third Street
Encinitas, CA 92024
Re fer ence:
PRELIMINARY GEOTECHNICAL INVESTIGATION
proposed Second Story Addition
and Driveway Improvements
1058 Third Street
Encinitas, California
Prepared by A.R. Barry and Associates
Dated July 10, 1990
Dear Mr. Horst,
In response to your request, we have performed density testing on
the above referenced property.
The
project
entailed
the
placement
of
fill
behind
a newly
constructed
garage
retaining
wall.
The fill will support the
proposed concrete driveway.
The placement of fill
was completed
prior to
thi s study.
The
'.
depth of
fill varies
from about
1.0 foot
to approximately 9.0
i~
feet.
November 22, 1991
W.O. tG-1178A
pag e 2
SUPPLEMENTAL FIELD INVESTIGATION
Exploration in
the driveway
area included the excavation of two
test pits
and the
drilling of
a 6.0
inch diameter exploratory
boring to
a depth of 8.0 feet.
Earth materials encountered were
visually
classified
and
logged
by
our
field
geologist.
Representative
sample s
of
the
fill
deposits
were
taken
at
selected intervals in the exploratory boring.
In
place density
tests (AS~1 D 1556) were performed in the test pits.
LABORATORY TESTING
Classification
The
field
classification
was
verified
through
labora tory
examination in accordance with
the
Unified
Soil Classification
System.
The final classification is shown on the enclosed Boring
Log s.
Moisture/Density
The field moistur e content
and dry
unit weight
were determ ined
for each
0 f th e
undisturbed soil
samples.
The information is
useful in providing
a
gross
picture
of
the
soil consistency
between exploratory excavations and any local variations.
."
~
The dry unit weight was determined in pounds per cubic foot.
The
field moisture
was dete rmined
as a
percentage of
the dry uni t
we igh t.
November 22, 1991
W.O. #G-1178A
pag e 3
Maximum Dry Density/Optimum Moisture Content
The
max im um
dry
density
and
optimum
moistur e
content
were
determined for selected samples of earth materials taken from the
si tee
The laboratory standard tests were in accordance with ASTM
D-1557-78.
The results
0 f th e
tests are
presented in Appendix
"A."
Relative Density
The in-situ unit weight of a soil is expressed as a percentage of
a maximum defined by
laboratory
standard
test
ASTM D-1557-78.
This
relative
density
was
determined
for selected samples of
earth materials taken from the site.
The
results are tabulated
in Appendix "A."
GEOLOGIC CONDITIONS
Most of the fill deposits are composed of reddish brown silty and
fine-grained sand obtained from the garage excavation.
The upper
2.0 feet
of fill is composed of whitish tan silty sand which was
imported.
CONCLUSIONS AND RECOMMENDATIONS
1.
The results of our
limited testing
indicate that
the fill
was
placed
to
a
minimum
of 90 percent of the laboratory
maximum dry density.
November 22, 1991
W.O. #G-1178A
pag e 4
2.
The
fill
is
pred ominan tly
granular
deposits
with
an
expansion potential in the very low range.
3.
Although our limited study indicates the fill was adequately
compacted, it is possible that localized loose pockets exist
in areas that were not
tested.
In
order
to
reduce the
possibility
of
adverse
effects
of
consolida tion,
the
proposed driveway slab should be reinforced with No.
3 bar s
placed 18 inches on center in both directions.
If you
have any
questions, please do not hesitate to contact us
at (619) 753-9940.
The opportunity to be of service is greatly appreciated.
Respectfully submitted,
A.R. BARRY AND ASSOCIATES
Mark Burwe 11
Geologis t
q!. B~E'
principal Engineer
APPENDIX "A"
LABORATORY TEST RESULTS
TABLE I
Maximum Dry Density and Optimum Moisture Content
(Laboratory Standard ASTM D-1557-78)
Soil Sample Max. Dry
Type Description Density (pc f)
A Whitish tan silty
and fine-grained sand 125.0
B Reddish brown silty
and fine-grained sand 129.2
Optimum
Moisture Content
9.8
9.2
TABLE II
Depth Dry
Test Be low Moisture Densi ty Relative % Soil
No. Location Grade Content % (p.c.f.) Compaction Type
1 Test pit No. lA -2' 8.0 124.3 96 B
2 Test pit No. 2A -1' 6.0 116.1 93 A
3 B-IA -4' 6.5 118.2 91 B
4 B-IA -6' 6.2 117.1 91 B
5 B-IA -8' 6.9 116.8 90 B
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5115 AVENIDA ENCINAS
SUITE "L"
CARLSBAD, CA. 92008-4387
(760) 931-8700
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