HomeMy WebLinkAboutCertification_6/9/20ifk-Aln o-5 3 3
Design/Build, Engineering, Construction Management
CHRISTOPHER KARCH & ASSOCIATES
Kirk Ljongquist
Kirk's Bobcat Service, Inc.
14538 94th Street North
West Palm Beach, 33412
June 4, 2020
Ref: Helical Piling installation Certification for "Pool & Spa"
Project: Cox Residence
123 Queen Federika Ave
North Hutchinson Island, FL
Certification of 10 Helical Piles under Pool & Spa
Engineer: M. Randall Rogers, PE
1801 Hazelwood Drive
Fort Pierce, FL 34982
FL PE 68212
Project No.: n/a
Dear Kirk:
This letter will certify your installation of 10 helical piles under the Pool & Spa as specified by the referenced engineer.
The engineer directed you to install all ten (10) helical pilings with a working load of 12 tons Capacity and an Ultimate Load
of 24 tons Capacity. The depth of the installation is as noted on the attached Table 1.0.
The Helical Pier Distributions, LLC installation and Design guidelines; specifically, the psi to Torque Chart, indicates that a
field pressure reading of 2,200 psi yields 7,000 ft -lbs of torque. In accordance with the Criteria sheet entitled, "Determining
Capacity from the Hydraulic Pressure" and using their ratio of "9.0" for a 2.875 -inch diameter shaft; this minimum torque
generates a capacity of (7,000 * 9.0) = 63,000 lbs or 31.5 tons. This is the "installed" capacity.
The field results for this project as indicated in the attached Table 1.0 meets or exceeds the specified requirement of the
engineer.
This letter certifies that all ten (10) pilings meets the engineer's design requirement.
Please contact me should you have any further questions or inquiries.
Thank you kindly, >
Z
Christooh& March, PE = President W
COA 7824--
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Christopher Karch & Associates 13125 Tangerine Blvd West Palm Beach - FL • 33412 www.cka-inc.com 561.686.5577
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