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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
7.6 The required ultimate torque-correlated capacity shall be verified at each soil nail location by
monitoring and recording final installation torque and applying default torque correlations per
ICC-ES AC358. Site specific torque correlation factors may be determined by field load testing
as specified in Section 14.
7.7 Except where noted otherwise on the project Plans, each soil nail shall be designed to meet a
corrosion service life of 50 years in accordance with ICC-ES AC358.
7.8 The soil nail design shall take into account group efficiency from soil nail spacing, soil
stratification, and strain compatibility issues.
8
QUALIFICATIONS OF INSTALLING CONTRACTOR AND DESIGNER
8.1 The Installing Contractor and/or Soil Nail Designer shall submit to the Owner, a proposal
including the documentation required in this Section. Work shall not begin until all the submittals
have been received and approved by the Owner. All costs associated with incomplete or
unacceptable submittals shall be the responsibility of the Installing Contractor.
8.2 Evidence of Installing Contractor’s competence in the installation of helical soil nails shall be
provided to the Owner’s satisfaction and may include any or all of the following:
8.2.1 Helical soil nail manufacturer’s certificate of competency in installation of helical soil
nails,
8.2.2 A list of at least three projects completed within the previous three years wherein
the Installing Contractor installed helical soil nails and/or helical tieback anchors in
comparable soil conditions for the nominal loads similar to those shown on the project
Plans. Such list to include names and phone numbers of those project representatives
who can verify the Installing Contractor’s participation in those projects, and/or
8.2.3 A letter from the helical soil nail manufacturer or manufacturer’s representative
expressing ability and intent to provide on-site supervision of the soil nail installation.
8.3 A listing of all safety violations lodged against the Installing Contractor within the previous three
years and the current status or final resolutions thereof. Descriptions of safety improvements
instituted within the previous three years may also be submitted, at the Installing Contractor’s
discretion.
8.4 Evidence of Soil Nail Designer’s competence shall be provided to the Owner’s satisfaction and
may include any or all of the following:
8.4.1 Registration as a Professional Engineer or recognition by the local jurisdictional authority,
8.4.2 A list of at least three projects completed within the previous three years wherein the
Soil Nail Designer designed helical soil nails similar to those shown in the project Plans.
Such list to include names and phone numbers of those project representatives who
can verify the Soil Nail Designer’s participation in those projects, and/or
8.4.3 Recommendation from the soil nail manufacturer or manufacturer’s representative.
