1992-3094 I/PE/PM
Street Address
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Serial #
Category
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Name
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Description
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Plan ck. #
Year
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BARRY AND ASSOCIATES
GEOTECHNICAL ENGINEERING
P.o. Box 348
Encinitas, CA 92023-0348
(619) 753-9940
œŒ@~ÛW~[ID
MAY 061993
April 29, 1993
Dominic D'Arcy
P.o. Box 232827
Encinitas, CA 92024
ENGINEERING SERVICES
CITY OF ENCINITAS
Subject:
Street Improvements
121, 123, 125 and 127 Grandview Avenue
Encinitas, California
Dear Mr. D'Arcy,
This report has been prepared at your request and presents the
results of our selective observation and density testing for the
improvement of a portion of Grandview Avenue.
The results of our
density tests are presented in Table I.
The approximate locations
of the tests are plotted on the enclosed Grading Plan.
LABORATORY TEST DATA
The laboratory standard for determining the maximum dry density was
performed in accordance with ASTM D 1557-78.
Field density tests
were performed in accordance with ASTM D 1556.
GEOTECHNICAL CONDITIONS
The street is underl ain by PI eistocene terrace deposi ts.
This
sedimentary unit is composed of tan to brown, fine- and medium-
grained sand with traces of clay.
8
8
April 28, 1993
w.o. #G-1311
Page 2
PAVEMENT SECTION
Laboratory testing performed on similar projects by this firm in
the vicinity of the site indicate an R-Value of 34 for Pleistocene
terrace
deposits.
Therefore,
the
city
of
Encinitas
minimum
pavement section was recommended and constructed as follows:
Minimum Pavement Section:
Grandview Avenue
(Traffic Index of 4.5, R-Value of 34, terrace deposits)
3 inches of asphaltic paving on
6 inches of select base (Class II) on
12 inches of recompacted (95 percent) terrace deposits
DISCUSSION-CONCLUSIONS
1.
Prior to our observation, the subgrade deposits were moistened
and compacted.
Sel ecti ve testing
indicated the
subgrade
deposi ts were compacted to a minimum of 95 percent of the
laboratory maximum dry density.
2.
Selective testing indicated that the 6.0 inch Class II base
section was
compacted to a minimum of
95
percent
of
the
laboratory maximum dry density.
8
8
April 28, 1993
w.o. #G-1311
Page 3
If you have any questions, please do not hesitate to contact us at
(619) 753-9940
This opportunity to be of service is appreciated.
Respectfully submitted,
A. R. BARRY AND ASSOCIATES
~~
Mark Burwell
Geologist
qR.~ar~
Principal Engineer
8
8
April 28, 1993
W.O. #G-1311
Page 4
APPENDIX "An
LABORATORY TEST RESULTS
TABLE I
Maximum Dry Density and Optimum Moisture Content
(Laboratory Standard ASTI D-1557-78)
Soil
~
Maximum Dry
Density (pcf)
Optimum
Moisture Content
Tan to brown fine-
and medium-grained sand
with trace of clay
123.9
8.5
Class II base
145.2
7.5
TABLE II
Field Dry Density and Moisture Content
1
Moisture Dry Relative
Content Density %
Depth* % (pcf) Compaction
Sub-base 10.3 126.2 97
Base 6.9 144.4 99c
Test
~
2
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