2019-1361 6924 176th St SW - Chinn Special Inspection4001 Main Street, Suite 305
Vancouver WA, 98663
P: 360.566.7343
February 26, 2020
Mr. Cory Myron
R&R Foundation Specialist
3409 McDougall Ave Suite 204
Everett, WA 98201
Re: Special Inspection – 6924 176th Street SW, Edmonds, Washington
Permit No.: BLD0191361
Dear Cory-
I have performed the special inspection of the installation of the helical anchors per IBC Chapter
17 for the above-referenced project.
Helical Anchor - Installation
The helical anchor used for installation was a 2 7/8” diameter pipe with a 10” diameter helix
configuration. The installation was performed by R&R Foundation Specialist, certified installers
for Piertech products using an MM10K drive head.
The maximum axial load requirement for this project is 10,000 lbs working load (20,000 lbs
ultimate). The anchors were driven to depths of 8 – 10 feet with a minimum installation pressure
of 1,300 psi. This results in an ultimate axial capacity of 31,468 lbs, exceeding the required
ultimate load per the design documents.
Summary
Based on my special inspection and structural observation, the helical anchors were installed
according to the engineering design load requirements and according to IBC Chapter 17.
Please give our office a call if you have any questions or need further assistance.
Regards,
Daniel Stark, P.E.
Stark Foundations, Inc.
Attachments: Drive Log
Helical Driver Torque Chart
4001 Main Street, Suite 305
Vancouver WA, 98663
P: 360.566.7343
Pier 1