20140516104202633.pdfNENNUM
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Tff GALLI GROU
Gcotechnicat Consulting
City of Edmonds
Building Division
Subject: Response to Corrections
Jacobson Retaining Wall
18140 84'h Ave W
Plan Check 2014-0204
Attention: Leif Bjorback, Building Official
Copies: Dennis Titus, Project Engineer
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Geo/Soils
April 30, 2014
TGG Project 1714-3
The following are responses to the correction notice from Leif 13jorback, dated April 2, 2014, regarding
the project described above. The items in our response correspond to the numbered items in the
correction notice. We have responded only to the items related to geotechnical issues. CG Engineering
will respond to the plan review comments as the lead on the project.
Item 3: Axial Loading on p-1 1, item 2 of Geotechnical Report.
Axial loading refers to the capacity of the pile along its axis. We recommend 6 kips for 2 -inch piles and
12 kips for 3 -inch piles. If the pipe were to be battered, then the vertical capacity would be reduced
accordingly since the capacity is along the axis of the pile. The piles are designed to resist the gravity
load of the wall as well as some of the load applied by the vertical component of the anchors.
Item 4: Helical Anchors The choice of the helical anchor is typically up to the installer while the
capacity of the anchor is provided by the engineer. During installation The Galli Group will verify that
the anchor achieves at least 200% of the design capacity of the anchor. The anchor recommended by the
sh Lictural engineer (8 -inch helix, 3/8 -inch thick, I 1/2 -inch bar) will typically achieve an ultimate capacity
of about 30,000 lbs in these granular soils. Thus the designated anchor seems appropriate for the design
load of 12,000 lbs. Increased capacity can often be achieved if necessary by increasing the deptl-/length
of installation or by increasing the diameter of the lead helix. It is incumbent upon the installer to achieve
the recommended capacity under geotechnical supervision/verification.
Response to Corrections (Geo/Soils)
Edmonds Plan Check 2014 — 0204
18140 84" Ave W
April 30, 2014
Page 2
Item 5: Statementfi-om Galli Group
The Galli Group has reviewed the revised drawings for the project prepared by CG Engineering dated 03-
04-14, and revised 04-14-14 , with regard to geotechnical elements. The design conforms to the
recommendations in our geotechnical report.
Item 7: 2 -inch Pipe Piles
Limited machine access has necessitated the use of 2 -inch piles rather than 3 -inch piles. We recommend
using 2 -inch galvanized schedule 80 extra strong steel pipe piles driven to nominal refusal defined as less
than I inch of penetration in 60 seconds of continuous driving under the weight of the operator and 90-1b
jackhammer. The capacity for a 2 -inch pile driven to this specification may be considered equal or
exceeding 12,000 lbs ultimate load or 6,000 lbs working load. The specification on the plans conforms to
this recommendation.
Hopefully this completes all actions requested.
Sincerely,
00
01
6041GGp
. . . . . . . . . . . . . . . IVO
Paul L. Stoltenberg, P.E.
Project Geotechnical Engineer
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1714 Response to Corrections GEO SOILS--JACOBSON—Plan 2014 0204.doc The Galli Group