HomeMy WebLinkAboutPD 2019-0015; CARLSBAD INN MITIGATION; RESPONSE TO GEOTECHNICAL REVIEW; 2019-07-05r
CHRISTIAN WHEELER
ENGINEER!NG
RECORD COPY
Li!L L1k
Date initial
July 5,2019 RECEIVED
OCT 012019
Grand Pacific Resorts, Carlsbad Inn CWE 2190062.04
3075 Carlsbad Boulevard LAND. DEVELOPMENT
Carlsbad, California 92008 ENGINEERING
Attention: Keith Whaley
Subject: Response to Geotechnical Review
Project ID PD2019-0015, GR2019-020, DWG 518-3A
Proposed Parking Garage Shoring
Carlsbad Inn, 3075 Carlsbad Boulevard, Carlsbad, California
References: 1) Michael Baker International, Shop Drawing Review, Proposed Parking Garage, May 31,
2019, Project No. 139000
Grading Plans For: Carlsbad Inn Water Intrusion Mitigation Project, Phase 2-4,
prepared by Excel Engineering, undated (Sheets 1 through 9)
Temporary Shoring Plans for Carlsbad Inn Water Intrusion Mitigation Plan, prepared
by Shoring Design Group, dated April 8, 2019 (Sheets 10 through 19)
Report of Limited Geotechnical Investigation, Proposed Parking Garage Shoring, &
Carlsbad Inn, 3075 Carlsbad Boulevard, Carlsbad, California, CWE Report 2190062.01,
dated March 19, 2019.
Ladies and Gentlemen:
C
In accordance with your request, we have prepared this report to present additional information required
by the City of Carlsbad regarding the geotechnical issues at the site. The comments in the referenced
geotechnical review letter and our responses to the comments in the referenced memorandum within Cz
our purview are presented below.
CU J--
Reviewer Comment 1: Geotechnical Engineer to determine by analysis the maximum vertical and
lateral soil displacement introduced to the adjacent structures, induced by 1" (Max) of lateral deflection
(measured at the top of the shoring).
3980 Home Avenue + San Diego, CA 92105 + 619-550-1700 + FAX 619-550-1701
V.
A.
01 CWE 2190062.04 July 5, 2019 Page No.2
CWE Response: The shoring located adjacent to structures will be braced; therefore, the lateral
deflection is expected to negligible.
Reviewer Comment 2: It is suggested that the maximum shoring deflection at the top of the pile/wall
(to be tolerated by any structure adjacent to the proposed shoring system) shall not exceed /4".
CWE Response: The shoring located adjacent to structures will be braced; therefore, the lateral
deflection at the top of the shoring wall is expected to negligible.
Reviewer Comment 3: Use at-rest soil pressure as the top of the shoring wall is restrained, without the
possibility of deflection. This condition is present on a few locations, where the shoring is relying on
adjacent structures for support (shoring is physically attached to adjacent structures).
CWE Response: It can be assumed that retained soils having a level surface behind shoring that is
restrained at the top will exert a lateral pressure equal to that developed by a fluid with a density of 50
pounds per cubic foot.
Reviewer Comment 4: Attaching shoring to adjacent buildings is not acceptable unless the structural
designer and geotechnical engineer of record provide calculations showing that the adjacent buildings are
not affected in any way by the loads imposed directly by the proposed shoring.
CWE Response: Such evaluation/calculation will need to be provided by the structural engineer.
If you have any questions regarding this letter, please do not hesitate to contact this office. Christian
Wheeler Engineering appreciates this opportunity of providing professional services for you for the
subject project.
Respectfully submitted,
CHRISTIAN WHEELER ENGINEERING
Shawn Caya,R.G.E.t oy S. Wilson, C. .G. #2 4551
FESSI
SCC:scc;djf
cc kwhaley@kmcgroup-llc.corn
TROY S. 0
No. 2551 J
I WILSON \O