HomeMy WebLinkAboutHelical Pier Report_1.pdf mAR5020 County Road 154
Glenwood Springs,CO 81601
Geotechnical Engineering I Engineering Geology Phone: (970)945-7988
Materials Testing l Environmental Fax: (970)945-8454
Email: hpkglenwood@kumarusa.com
Office Locations: Denver(HQ),Parker, Colorado Springs,Fort Collins,Glenwood Springs,Summit County,Colorado
July 20, 2018
Integrated Landscape Management
Attn: Shelly Mello
P. O.Box 115
Avon, Colorado 81620
shelly@integrated-land.com
Project No. 18-7-253
Subject: Observation of Helical Pier Installation, Proposed Deck Addition, Olson
Residence, Lot 6, Lia Zneimer Subdivision, 1726 Buffehr Creek Road, Vail,
Colorado
Dear Shelly:
As requested, a representative of H-P/Kumar observed a helical pier installed at the subject site
on July 11,2018 to evaluate the pier for foundation support. The findings of our observations
and recommendations are presented in this report. The services were supplemental to our
agreement for professional engineering services to Integrated Landscape Management dated
April 5, 2018.
We previously observed a backhoe pit excavated at the site to provide recommendations for a
new stairway and site wall and submitted our findings in a report dated May 4, 2018 under the
above project number.
One helical pier has been designed to support the southwest corner of the deck on the west side
of the residence. The pier has been designed to have a downward allowable working capacity of
18 kips. The pier design was by Ewing Engineering, Inc. dated June 27, 2018.
The pier was installed by Great Divide Construction. The pier consisted of a Heli-Pile
HP-15X with 11/2" square bar and triple 8, 10 and 12 inch helices. The pier was located under the
southwest corner of the deck as designed by Ewing Engineering. The pier achieved torque
refusal at 10 feet depth with 8 shear pins (40-kip capacity) then had 2 additional pins added (10
pins total) and penetration refusal at 101 feet depth.
We believe the pier has capacity to support the design load with adequate safety factor. There
could be some differential settlement between deck areas supported on spread footings and the
helical pier. Void form below the helical pier cap does not appear neededbased on the install
depth of the pier.
r
Integrated Landscape Management
July 20, 2018
Page 2
The findings submitted in this report are based on our observation of the pier installation and our
experience in the area, and did not include subsurface exploration at the deck site. Variations in
the subsurface conditions below the helical pier could increase the risk of foundation movement.
It is possible the data obtained by subsurface exploration could change our findings.
If you have any questions or need further assistance,please call our office.
Sincerely,
H-PtKUMA. • "rse'�,'10;
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David A. Young, P.Er�.,1..t�, gG `��
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Project No. 18-7-253