HomeMy WebLinkAboutPD 2020-0036; PLAZA BONITA SLOPE REMEDIATION; THIRD PARTY GEOTECHNICAL REVIEW (FIRST); 2020-10-29HETHERINGTON ENGINEERING, INC.
SOIL & FOUNDATION ENGINEERING • ENGINEERING GEOLOGY • HYDROGEOLOGY
October 29, 2020
Project No. 923€. I
Log No. 21138
City of Carlsbad
Lanl Development Engineering
1635 Faraday Avenue
Carsbad, California 92008
Attertion: Mr. David Rick
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(MMAT )
Subject: THIRD-PARTY GEOTECUNTCAL REVIEW (FIRST)
Slope Failure
2210 Plaza Bonita
Carlsbad, California
Project ID: PD2020-0036
References: 1. "Geotechnical Inspection of Slope Failure, 2210 Plaza Bonita,
Carlsbad, CA 92009", by Martin R. Owen PE, GE, dated June 1, 202G.
2. "Grading Plans For: Slope Rpair, 2210 Plaza Bonita", by The Sea
Bright Company, dated October 5, 2020 (Sheets. through 4).
Dear Mr. Rick:
In accordance with your request, Hetherington E:gineering, Inc. has provided third-party
geotechnical review of Reference I. The followi:ig comments are provided for analyses
and/or respOne by the Geotechnical Consultant.
REVIEW CF GEOTECHNICAL REPORT
I. The Consultant should review the project grading plan, provide any addition--II
geotechnical recommendations considered necessary, and confirm that the plans have
been prepared in accordance with the geotecrinical recomm.en:lations provided in the
referenced report.
The Co:isultant should provide an updated 2eotechnical map/plot plan utilizing the
latest grading plan for the project to clearly show (at a rninirnim), a) existing site
topography, b) proposed finished grades, c) locations of the subsurface exploration, ci)
geologic contacts, and e) remedial grading limits, etc.
The consultant should provide geologic cross-sections utliz.rg the current grading
plan to clearly show (at a minimum), a) existing site topography, b) proposed finished
5365 Avenida Encinas, Suite A • Carlsbad, CA 92008-4369 • (760) 93t-1c17 • Fax (760) 931-0545
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www.hetheringtonengineering.com
THIRD-PARTY GEOTECHN ICAL REVIEW (FIRST)
Project No. 9236.1
Log No, 21 188
October 29, 2020
Page 2
grades, c) geologic contacts, d) geologic structure, e) locations of the subsurface
exploration, f temporary construction slopes, and g) remedial grading, etc.
The Consiiftant should perform field exploration, laboratory testing, and analyses to
provide a basis for the slope repair recommendations.
The Consul Can should provide recommendations for temporary excavations.
The. Consultant should address the sLilficial stability of the proposed repaired slope.
The Consultant should provide a statement regarding the impact of the proposed
grading cii adacent properties and improvements,
The Consultant should provide a list of recommended observation and testing during
site grading and constriction.
The Consultant should provide a list of published maps/reports used in the
preparation of the report.
The opportunity to be of service is sincerely appreciated. If you have any questions
regarding this review, please contact this office at your convenience.
Sincerely.
II ETi IRINCTON ENGINEERING, INC.
Mark D. Hetherin
klivil Engineer 3 o.397
expires 3/3 1,12 .
FAMI~120000
Paul A. Bogseth
Professional Geologist 3772
Certified Engineering Geologist 1153
Certified Hydrogeologist 591
(expires 3/31/22)
PAULA. \1
E.G. 1153 ) Ep;
25
Distribution: I -via e-mail (David.RickcarLbadca.gov)
1-via e-mail 1Brige.t. BokacarIsbadca.gov)
HETHERINGTON ENGINEERING, INC.