HomeMy WebLinkAboutCDP 2019-0009; AKIN RESIDENCE; Preliminary Geotechnical Investigation Report; 2019-11-21Geotechnical Exploration, Inc.
SOIL AND FOUNDATION ENGINEERING • GROUNDWATER • ENGINEERING GEOLOGY
21 November 2019
Sadri and Rose Akin
8839 Badger Way
Elk Grove, CA 95624
Job No. 19-12322
Subject: Addendum to Report of Preliminary Geotechnical Investigation
Akin Residence
5290 Carlsbad Boulevard
Carlsbad, California
Dear Mr. and Mrs. Akin,
In accordance with the request of your architect Mr. Tim Martin, we have reviewed
item A.2., Building Surface and Subgrade Preparation as presented on page 24 of our
"Report of Preliminary Geotechnical Investigation," dated July 3, 2019. Within item
A.2., we state " ... at least the upper 2 ½ feet of pad fill and top soils should be
reworked and recompacted." Based on review of our four exploratory excavations
that reveal the upper 1 to 2½ feet of surficial soils to consist of silty sands that are
uniformly underlain by adequate bearing medium dense to dense Old Paralic (marine
terrace) deposits (Qop6-7 ), we are able to provide an alternative for site soil
preparation. In our opinion, the 1 to 2½ feet of surficial soil can be adequately
compacted with removal of the upper 1 foot of fill soil followed by use of a walk-
behind vibratory roller, or similar soil compaction equipment, on the exposed surface
of the excavation.
Upon verification of bearing adequacy by field density testing, the removed upper 1-
foot of fill soil can be replaced and compacted to the design finished grade.
Verification that soils have been compacted to 90% of maximum dry density must be
provided by the project geotechnical engineer.
7420 TRADE STREET• SAN DIEGO, CA. 92121 • (858) 549-7222 • FAX: (858) 549-1604 • EMAIL: geotech@gei-sd.com
Akin Residence
Carlsbad, California
C
Job No. 19-12322
Page 2
If you have any questions regarding this letter, please contact our office. Reference
to our lob No. 19-12322 will help expedite a response to your inquiry.
Respectfully submitted,
GEOTECHNICAL EXPLORATION, INC.
Leslie D. Reed, President
P.G. 3391/C.E.G. 999 . . .
Senior Geotechnical Engineer