HomeMy WebLinkAboutPD 16-15; HARRIS RESIDENCE; GEOTECHNICAL INVESTIGATION, ADDENDUM 1; 2016-08-26ClFIN 7
Construction Testing & Engineering, Inc.
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August 26, 2016 CTE Job No. 10-13064G
C/O: MC Consultants
Attention: Mr. Jeff Hams
2055 Corte Del Nogal
Carlsbad, California 92011
Telephone: (760) 930-9966 Via Email: ieff.harris(mcconsultants.com
Subject: Geotechnical Investigation, Addendum 1
Carlsbad Lot 57
SW End of Unicomio Street
Carlsbad, California
Reference: Anchor Retaining Wall Plans, Sheets 1 through 4
Harris Residence
Prepared by Red One Engineering, dated August 6, 2016
Segmental Retaining Wall Soil Design Parameters (Attachment A)
Lot 57
La Costa Meadows
CTE Job No. 10-13064G, dated July 20, 2016
Geotechnical Investigation (Attachment B)
Lot 57 La Costa Meadows Unit 1
Unicornio Street
Carlsbad, California
CTE Job No. 10-13064G, dated May 13, 2016
Mr. Harris:
As required due to proposed segmental block wall, Construction Testing & Engineering, Inc.
(CTE) provides the following addendum information to our referenced geotechnical report. CTE
has reviewed the referenced retaining wall plans. CTE finds the plans to be in general
conformance with the referenced geotechnical documents, with the following exceptions noted
below. Additionally, this addendum letter is intended to address redline comments from the City
of Carlsbad, provided to CTE by the client.
On Plan Sheet 1, 2.0 Reference Documentation, Note 2, the job number should be
changed to 10-13064G. Additionally, CTE's Geotechnical Investigation referenced above
(CTE, May 2016) should be added to the documentation notes.
Plan Sheet 1, 6.0 Material Notes, Note 5 requires that reinforced fill soils exhibit zero to
35 percent passing the No. 200 sieve. Please note that onsite soils were field classified as
It silty and clayey sands. One gradation sample was performed during the referenced
1441 Montlel Road, Suite 115 I Escondido, CA 92026 I Ph (760) 7464955 I Fax (760) 746-9806 I www.de-lnc.net
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Plan Review Letter
Carlsbad Lot 57
SW End of Unicornio. Street
Carlsbad, California
August 26, 2016
Page 2
CTE Job No.: 10-13064G
geotechnical investigation and shows approximately 30 percent passing the No. 200
sieve. However, this sample may not be representative of all site soils, and therefore, and
as noted in the soil design parameters worksheet provided by the client and filled out by
CTE (CTE, July 2016), select grading should be anticipated, at a minimum. Pending
additional laboratory testing of specific soils intended for use as reinforced zone backfill,
import of appropriate soils may be necessary.
A City of Carlsbad redline copy of CTE's Figure 2 Exploration Location/Geologic Map
(CTE, May 2016) was provided to CTE, requesting revision of the figure to show the
proposed access path/road ascending the slope to the south of the building pad. Please see
the attached revised Figure 2 showing the proposed access path/road ascending the slope
to the south of the building pad.
A City of Carlsbad redline copy of CTE's Figure 4 Retaining Wall Drainage Detail
(CTE, May 2016) was provided to CTE, requesting revision of the figure to apply to
segmental walls. Referenced Plan Sheet 4, Detail G.4 details appropriate typical wall
drainage design, and should be used in lieu of CTE's aforementioned Figure 4.
Additional drainage devices may also be recommended based on conditions encountered
during construction.
This letter is subject to the same limitations as provided in CTE's other geotechnical documents
issued for this project.
We appreciate the opportunity to be of service on this project. Should you have any questions,
please contact our office.
Sincerely,
CONSTRUCTION TESTING AND ENGINEERING, INC.
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Colin J. Kenny, RCE# 84406
Project Engineer
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Dan T. Math, GE# 2665
Principal Engineer
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FIGURES
Figure 2 Exploration Location/Geologic Map (Revised August, 2016)
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ATTACHMENT A
Segmental Retaining Wall Soil Design Parameters
Lot 57
La Costa Meadows
CTE Job No. 10-13064G, dated July 20, 2016
1441 Montiel Road, Suite 115 1 Escondido, CA 92026 I Ph(760)704955 I Fax (760) 746-9806 I www.cte-inc.net
SEGMENTAL RETAINING WALL
SOIL DESIGN PARAMETERS
Date: 2..O/ /C 7 Job No. F16-130Cq
Project: LTI 7,1 14 eorlq
Prepared By: CTE j
Client:
Soil Parameters Reinforced Retained Foundation
Internal Friction Angle: 2 ç. 2 2
Cohesion (pat): zap
Moist Unit Weight (pct): /fç 6 j ,/50 I /fS
Water should be prevented from Infiltrating into the reinforced zone behind the wail. Our standard
design Includes a 1' drain rock column behind the block, a 4 perforated drain at base of wall and a"burrito"
drain at the tail of the geogrid reinforcement. Are there any other drainage requirements?
i cre 1. /. ..// i..J
Embedment requirements, distance to daylight? /,e 4 /6 4CFJ I.
Design peak ground acceeraUon?ji./(
Is a global stability analysis needed? (to be completed by the geotechnicai engineer) Vt;
Other design considerations? fl.,' I, ci// " C/det r../r./5 ni/ q/I ,4jo./s 0dIP//4if
Temporary backcut constraints? Plgx I I
Company: ________________
Engineer: C-0 64 (4rn1
Date:
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