PalmerGeo - Roseridge Final Const Summary 10-21-2021TPALMER
eotechnical Consultants, Inc.
October 21, 2021
Rose Ridge Home Owners Association
c/o Mr. Alex Pierce
21313 76th Avenue West
Edmonds, WA 98026
alexrpierce@comcast.net
425-771-7972
RE: Preliminary Geotechnical Report
Parcel No. 00875400000100
21317 76th Avenue W. • Edmonds, WA 98026
PGC Project 19011
Dear Mr. Pierce:
Palmer Geotechnical Consultants, Inc. (PGC) is pleased to present this project completion and final report
regarding retaining wall improvements at the subject property. As you know Palmer Geotechnical
Consultants, Inc. (PGC) developed geotechnical recommendations regarding the design and construction
of a retaining wall at the subject property. We presented our findings in the project geotechnical report
dated September 13, 2018.
We visited the periodically to evaluate the construction progress on September 15 through 24, 2021. These
visits were conducted to observe, document and provide special inspections of the construction elements
outlined by the City of Edmonds as conditions of Building Permit No. 2020-0974.
Conclusions
Based on observations made during periodic visits over the course of the construction project we conclude
that retaining wall facilities at the site are installed in general accordance with the project documents (please
see the attached field reports).
Closure
The analysis and recommendations presented in this letter are based upon the data obtained from our site
visit, available public records, and from other information and sources discussed in this letter. This letter
does not reflect variations that may occur between known data points, across the site, or due to the
modifying effects of construction or weather. The nature and extent of such variations may not become
Palmer Geotechnical Consultants, Inc.
PO Box 1562, Freeland, WA 98249
360-929-5676
www.palmergeo.com
TGPALMER
eotechnical Consultants, Inc.
evident until construction begins or is completed. Should variations appear that differ from the data and
recommendations contained within this letter, PGC should be immediately notified so that further
evaluation and supplemental recommendations can be provided. PGC is not responsible for insuring that
other members of the project team implement our recommendations.
The scope of our services does not include services related to construction safety precautions or dewatering
operations. Our recommendations are not intended to direct the contractor's methods, techniques,
sequences or procedures, except as specifically described in our report for consideration in design.
Within the limitations of scope, schedule, and budget, our services have been executed in accordance with
the generally accepted practices. This letter has been prepared for the exclusive use of our client and their
representatives for specific application to the project discussed and has been prepared in accordance with
generally accepted geotechnical engineering practices in this area at the time this letter was prepared. No
warranties, either expressed or implied, are intended or made. Site safety and dewatering requirements are
the responsibility of others. In the event that changes in the nature, design, or location of the project as
outlined in this letter are planned, the conclusions and recommendations contained in this letter shall not be
considered valid unless PGC reviews the changes and either verifies or modifies the conclusions of this
letter in writing.
If you have questions regarding this letter, I can be reached at 360-929-5676 or spalmer@palmergeo.com.
Sincerely,
Palmer Geotechnical Consultants, Inc.
?1-2021
Scott A. Palmer, P.E.
Attachments:
• Selected Project Images
• Daily Field Reports
K,
TGPALMER
eotechnical Consultants, Inc.
RETAINING WALL CONSTRUCTION NEARING COMPLETION
3
TGPALMER
eotechnical Consultants, Inc.
PILE TEST APPARATUS PERFORMING AS -DRIVEN LOAD TEST
Rose Ridge Condominiums ***
Field Report Observations pG APALMER
CGeotechnical Consultants, Inc.
FIELD REPORT
Project Name: Rose Ridge Condominiums Project Number:
PGC Representative: Meghan Hallam Date:
Time Onsite: 8:45 am Weather:
09.15.2021
19011
09.15.2021
Overcast becoming
sunny
Daily Task: Observe pin piles
Comments
Palmer Geotechnical Consultants (PGC) onsite as requested to observe the installation of pin piles at
project location. Eleven piles were driven along the east side of the project area with two piles driven at
the north and south end for the return by Pile King (contractor). Piles were 2-in round schedule 80 steel
in 10.5-foot lengths.
Piles were driven with a 400-pound hammer on a rubber track excavator. Refusal criteria is 1-inch at 10
seconds. Table 1 shows the pile number and driven length.
Pile
Driven
Length
1
12.0
2
14.0
3
14.5
4
13.5
5
13.5
6
16.0
7
15.0
8
14.5
9
15.0
10
13.0
11
13.5
Photo 1: Looking north at pile 3 location with Photo 2: Looking north at driven piles 8-11.
pile 2 location in the foreground.
Rose Ridge Condominiums
Field Report Observations
09.15.2021
The work observed today was in general conformance with the project documents and specifications.
PGC site Representative:
ghan Hallam
Rose Ridge Condominiums
Field Report Observations
pG **PALMER
CGeotechnical Consultants, Inc.
FIELD REPORT
Project Name: Rose Ridge Condominiums
PGC Representative: Meghan Hallam
Time Onsite: 8:45 am
Daily Task: Observe helical piles
Project Number:
Date:
09.16.2021
19011
09.16.2021
Weather: Sunny
Comments
Palmer Geotechnical Consultants (PGC) onsite as requested to observe the installation of helical piles at
the project location. Five helical anchors are part of the design as tie -backs. Helical anchors are 5 feet
in length at 1.5-inch square, with an 8-inch lead flights followed by a 10-inch flight. Refusal criteria is
550 psi. A rubber track excavator, provides the hydraulic power.
Helical 1 (Al) was installed approximately 3.4 feet north and 1.5 to 2.0 feet east of the south corner. Al
was not able to be completed due to the 4x3x2 catch basin (CB) located in the area with an unknown
footing. Three attempts were made and rejected due to lack of refusal criteria and the CB obstructing
advancement. Further attempts were abandoned so that the CB was not damaged and to not further
disturb the existing subsurface. The contractor will over -excavate in the vicinity of the CB to aid in
understanding the dimensions of the obstruction. If a helical cannot be driven, PGC has determined that
the whaler may be doubled from A2 to the south corner and along the return. A2 was driven
approximately 5.4 feet west of the failed Al location. A2 was driven successfully with a completed
1,000 psi for refusal at an angle of 22 degrees and a total of 15 feet in length
Helical
Length
Angle
A2
15.0'
220
Photo 1: Looking south at anchorl location Photo 2: Photo shows anchors prior to
during installation attempt. installation.
The work observed today was in general conformance with the project documents and specifications.
PGC site Representative:
Qeghan Hallam
Rose Ridge Condominiums
Field Report Observations
P* PALMER
C/Geotechnical Consultants, Inc.
FIELD REPORT
Project Name: Rose Ridge Condominiums
PGC Representative: Meghan Hallam
Time Onsite: 8:45 am
Daily Task: Observe helical piles and load test
Project Number:
Date:
09.20.2021
19011
09.20.2021
Weather: Sunny
Comments
Palmer Geotechnical Consultants (PGC) onsite as requested to observe the installation of helical piles at
the project location. Five helical anchors are part of the design as tie -backs. Helical anchors are 5 feet
in length at 1.5-inch diameter, with an 8-inch lead flights followed by a 10-inch flight. Refusal criteria
is 550 psi driven with a rubber track excavator.
Due to complications that arose from the existing catch basin and associated pipes, on Friday, September
17, 2021 the contractor and Pile King representatives exposed the pipes and catch basin. Helical anchors
1, 3, 4, and 5 were placed 10.0 feet in at prescribed angles and backfilled. H1 was advanced on Friday
with refusal of 1,550.0 psi for 15.0 feet at 19 degrees. On Monday, September 20, 2021, PGC was onsite
to observe the advancement of A3, A4, and A5. A3 was advanced to refusal of 1,550.0 psi for 20.0 feet
at 19 degrees. A4 was advanced to refusal of 550.0 psi for 35.0 feet at 17 degrees. A5 was advanced to
refusal at 1,550.0 psi for 20.0 feet at 16 degrees. A4 and A5 will be cut back to meet the whaler for a
total length of 31.0 and 17.0 feet, respectively.
Helical
Length
Angle
Al
15.0'
190
A3
20.0'
190
A4
35.0'
170
A5
20.0'
160
A pull test was performed on A3. 1,000 psi was placed on the helical anchor and sustained for 10
minutes.
Photo 1: Looking north at A3 in the foreground, Photo 2: Photo shows pull test being performed.
A4, and A5.
Rose Ridge Condominiums
Field Report Observations
09.20.2021
The work observed today was in general conformance with the project documents and specifications.
PGC site Representative:
Qeghan Hallam
Attachment: Pile and Anchor Schematic
Pii Pin
EXISTING
3.90' i 5.30' 4.40' 6.40' i 5.20' 3.20'
A4
P9 PR P7 Ph P5 P4 P3
P2 P1
***J Figure:
pG ** Roseridge Condominiums Pin Pile and Helical Anchor 9
/PA LMER Edmonds WA
C,� Geotechnical Consultants, Inc Schematic 2
Rose Ridge Condominiums
Field Report Observations
P* PALMER
C/Geotechnical Consultants, Inc.
FIELD REPORT
Project Name: Rose Ridge Condominiums
PGC Representative: Meghan Hallam
Time Onsite: 9:45 am
Project Number:
Daily Task: Observe Drainage Section Behind Wall
Date:
09.24.2021
19011
09.24.2021
Weather: Sunny
Comments
Palmer Geotechnical Consultants (PGC) onsite as requested to observe the drainage section behind the
new bluff crest wall.
Since the last site visit on Monday, September 20, 2021, PGC observed that the boards and waler had
been attached. Additionally, the drainage section behind the wall was in the process of being installed.
PGC observed that separation fabric had been placed in all directions behind the wall. Drain rock had
been placed in the base of the section and a 4-inch drain pipe had been installed approximately 3.5 feet
below the top of the wall. The drain was closed at both ends and tied into the existing storm drain with
sufficient fall.
Photo 1: Looking south along the drainage
section. Photo shows the separation fabric, drain
rock, and drain pipe.
Photo 2: Photo shows connection of wall
drainage to the existing storm drain.
The work observed today was in general conformance with the project documents and specifications.
PGC site Representative:
Qeghan Hallam