HomeMy WebLinkAbout; Poinsettia Village; Geotech Observation and Compaction Report; 2005-07-15Converse Consultants
Over 50 Years of Dedication in Geotechnical Engineering and Environmental Sciences
July 15, 2005
Mr. Clint Knox
Donahue Schriber Realty Group, Inc JU! 1 V ^^wJ
200 E. Baker Street, Suite 100
Costa Mesa, California 92626 Schater Development Group
Re; Geotechnical Observation and Compaction Report -- Rough Grading
North Island Credit Union (Poinsettia Village)
7190 Avenida Encinas
Carlsbad, California
Converse Proposal No. 05-32123-30
Dear Mr. Knox:
This report presents the results of field density tests and geotechnical observations
made during the rough grading of the pad for the North Island Credit Union at Poinsettia
Village between July 11 and July 13, 2005. Converse previously performed a
geotechnical investigation at the site and the results of the evaluation were presented in
our report entitled, "Geotechnical Investigation Report, Two Retail Structures - Pad 4
and Pad 6, 7190 Avenida Encinas, Carlsbad, California" dated April 5, 2005.
1.0 PROJECT DESCRIPTION
The proposed building for the North Island Credit Union consisted of a one-story
building with a plan area of approximately 5,800 square feet. Associated with the
building are parking areas and various site improvements.
2.0 SCOPE OF WORK
Our scope of work for this project included on-call and full-time geotechnical observation
during rough grading for the pad and field density testing to verify backfill compaction
compliance with the project specifications, and geotechnical engineering consultation
during construction.
3.0 PROJECT SPECIFICATION
Earthwork was performed in general accordance with the project plans and
specifications. The following reports, and project plans were used as a guide for the
earthwork:
• Converse Consultants (4/5/2005) "Geotechnical Investigation Report, Two Retail
Structures - Pad 4 and Pad 6, 7190 Avenida Encinas, Carlsbad, California"
Converse Project No. 05-32123-01, dated April 5, 2005.
PriniBd
1^^^^ Recyclsd
185 East Paularino Avenue, Suite B, Costa Mesa, California 92626
p;^',"" Telephone: (714) 444-9660 • Facsimile: (714) 444-9640 • e-mail: costamesa@converseconsultants.com
Rough Grading Observation Report
North Island Credit Union
Carlsbad, Califomia
July 15, 2005
Page 2
• Project plans by O'Day Consultants, Inc., dated June 23, 2005.
4.0 LABORATORY TESTS
One (1) representative bulk sample was obtained during grading observation to
determine its laboratory maximum dry density and optimum moisture content per ASTM
Standard D1557-00. Results of the tests are summarized in Table No. 1, Optimum
Moisture Content and Maximum Dry Density Test Results.
5.0 FIELD DENSITY TEST RESULTS
Nuclear Gauge (ASTM Standard D2922-96) was utilized to evaluate the field density of
compacted soils at random locations. Converse personnel performed these field density
tests during the earthwork operation between July 11 and July 13, 2005. Results ofthe
field density tests are presented in Table No. 2, Summary of Field Density Test Results,
and the test locations are shown on Figure No. 1, Field Density Test Location Plan. The
relative compaction for each field density test presented in Table No. 2, Summary of
Field Density Test Results, is obtained by dividing the measured in-place dry density by
the laboratory maximum dry density of the same "Soil Type" presented in Table No. 1,
Optimum Moisture Content and Maximum Dry Density Test Results. Where results of a
field density test indicate less than the required minimum relative compaction for that
specific material, the fill volume representative of the failed test was reworked by the
contractor until a subsequent test showed passing results.
6.0 GEOTECHNICAL OBSERVATIONS AND DISCUSSION
The following is a brief discussion of the field observations made during the construction
of the project. —"~
• The upper five (5) feet of the building pa^UandToB-feet beyonSTtre-building liynit
compactionr*^ were overexcavated and recompacted Ijdat least 90% relative compactior
• Backfill soils were moisture conditioned, aiW plaued in 0- lu ti- iriclResloose lifts,
and compacted to at least 90 percent relative compaction.
7.0 CONCLUSIONS
The conclusions and opinions developed during the course of our field assignments are
based on our field observations and the results of field and laboratory testing combined
with our experience. Based on the field tests, observations, and our professional
judgment, it is our opinion that the compacted fills reported herein meet the intent of the
project requirements.
CONVERSE CONSULTANTS
K:\Project Files\05-32123-01
Rough Grading Observation Report
North Island Credit Union
Carlsbad, Califomia
July 15, 2005
Page 3
Our field testing was performed at random locations and at various time intervals during
the fill placement operations. Converse did not actually sample or test every portion of
the fill material placed at the site. While our test results are considered representative of
the compacted fills in general, variations in material properties, relative compaction, and
moisture condition should be expected in lateral and vertical directions. Such variations
may have resulted due to non-uniformity of earth materials and variations in the
earthwork operations such as: variable lift thickness, non-uniform moisture conditions
and non-uniform compactive effort. Therefore, any localized areas of deviations in fill
quality and compaction requirements cannot be detected by our limited field
observations and tests.
8.0 LIMITATIONS
Our services have been performed in accordance with currently accepted professional
engineering practice in the field of geotechnical engineering. We make no other
warranty, either expressed or implied.
Neither our office nor our representatives were responsible for construction techniques
and the type of equipment used to accomplish fill placement and compaction to meet
the project specifications.
Professional opinions presented in this report are based on our observations, on
evaluations of the technical information gathered, on our general understanding of the
earthwork construction, and on our general experience in the geotechnical field. We do
not guarantee the performance of the project in any respect, only that our engineering
work and opinions rendered meet the standard of care of our profession at this time.
Respectfully submitted.
CONVERSE CONSULTANTS
Krishnamenon Nadaraja, P.E.
Project Engineer
End: Table No. 1, Optimum Moisture Content and Maximum Dry Density Test Results
Table No. 2, Summary of Field Density Test Results
Figure No. 1, Field Density Test Location Plan
Dist: 5/Addressee
CONVERSE CONSULTANTS
K:\Project Files\05-32123-01
North Island Credit Union
Poinsettia Village
7190 Avenida Encina
Carlsbad, California
Converse Project Number 05-32123-01
TABLE 1
OPTIMUM MOISTURE CONTENT AND MAXIMUM DRY DENSITY TEST RESULTS
Material
Type Description
Optimum
Moisture Content
(%)
Maximum Dry
Density (pcf)
1 Silty Sand(SM) with clay 10.0 127.5
CONVERSE CONSULTANTS Converse Project No. 05-32123-01
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FIELD DENSITY TEST LOCATION PLAN
North Island Credit Union
1790 Avenida Encinas
Carlsbad, California
Project No.
05-32123-01
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