HomeMy WebLinkAboutMS 16-05; 1284 PINE AVE; THIRD PARTY GEOTECHNICAL INVESTIGATION REVIEW (SECOND); 2019-12-11S 'I
HETHERINGTON ENGI NEERING, INC.
SOIL & FOUNDATION ENGINEERING • ENGINEERING GEOLOGY • HYDROGEOLOGY
December 11, 2019
Project No. 8924.1
Log No. 20789
City of Carlsbad
1.635 Faraday Avenue
Carlsbad, California 92008
Attention: Ms. Kyreime Chua
Subject: THIRD-PARTY GEOTECHNICAL REVIEW (SECOND)
Proposed 2nd Dwelling
1284 Pine Avenue
Carlsbad, California
Project ID: GR2019-0024 - DWG 518-7A
Reference: 1) "Certification of Pad, Proposed 2 nd Dwelling, APN: 205-020-04, Lot 9
of Tract Map No 1744, 1284 Pine Avenue, City of Carlsbad, San
Diego County, California, Work Order No. 1931503.22", by South
Shore Testing & Environmental, dated May 9, 2016.
"Geotechnical Update, As-Graded Conditions, 1284 Pine Avenue,
Carlsbad, California 92008", by W. C. Hobbs, Consulting Engineer,
dated June 6, 2019.
"Grading Plan For: 1284 Pine Avenue", by W.C. Hobbs, Consulting
Engineer, dated June 6, 2019 (2-sheets).
"Third-Party Geoteëhnical Review (First), Proposed 2 Dwelling,
1284 Pine Avenue, Carlsbad, California, Project ID: GR2019-0024 -
DWG 518-7A", by Hetherington Engineering, Inc., dated July 16,
2019.
Geotechnical Update Report with References, As-Graded Conditions,
1284 Pine Avenue, Carlsbad, California", by W.C. Hobbs, Consulting
Engineer, dated November 5, 2019.
Dear Ms. Chua:
In accordance with your request, Hetherington Engineering, Inc. has provided third-party
geotechnical review of Reference 5. The following comments are provided for analyses
and/or response by the Geotechnical Consultant.
5365 Avenida Encinas, Suite A • Carlsbad, CA 92008-4369 • (760) 931-1917 • Fax (760) 931-0545
333 Third Street, Suite 2 • Laguna Beach, CA 92651-2306. (949) 715-5440 • Fax (760) 931-0545
www.hetheringtonengineering.com
3
Civil Engineer 30488
Geotechnical Engin
(expires 3/31/20) 1
Distribution: 1-via e-mail Kyrenne. Chuacarlsbadca.gov)
1-via e-mail (Cecelia.Fernandezcarlsbadca.gov)
No. 391
,[NC.
aul A. Bogseth
Professional Geologist 3772
Certified Engineering Geologist 1153
Certified Hydrogeologist 591 ) (expires 3/31/20)
40
THIRD-PARTY GEOTECHNICAL REVIEW (SECOND)
Project No. 8924.1
Log No. 20789
December 11, 2019
Page 2
The Consultant should discuss regional geologic conditions, geologic structure, and
faulting. (Second Request)
The Consultant should address liquefaction and tsunami potential at the site. (Second
Request)
Reference I indicates scarification and recompaction of the graded pad is
recommended. Reference 2 indicates no "further grading requirements". The
Consultant should address this apparent discrepancy. (Second Request)
The Consultant should address impacts to adjacent property and improvements as a
result of site grading and construction. (Second Request)
The Consultant should provide hardscape recommendations (thickness,
reinforcement, joints, etc.), if necessary. (Second Request)
The Consultant should provide the seismic design category for the site.
It should be noted that the Conclusions and Recommendations in the "Certification of
Pad...." report should refer to the 2016 California Building Code and the current City
of Carlsbad guidelines. No response required.
Please call if there are any questions.
Sincerely,
HETHERINGTON ENGINEERING, INC