City of Frisco Engineering Standards

Engineering Standards
1. Geometry (cross section and loading conditions);
2. Location of the water table;
3. Soil/rock stratigraphy; and
4. Soil/rock properties (unit weight, Atterberg Limits, undrained and drained shear strength).
C. For global stability of a slope, the minimum factor of safety of 1.5 is required unless the
geotechnical engineer recommends a higher value.
9.07 Screening Wall Design Criteria
A. Screening Walls shall meet the minimum requirements included in the Subdivision Ordinance,
Section 8 and the Zoning Ordinance, Section 4.03 – Screening Standards.
B. An opening designed to allow for storm water drainage shall be provided unless it has been
determined by the Director of Engineering Services that no drainage problems are anticipated.
The opening shall be a uniform 2” high the full length between columns.
C. All screening walls shall be designed by a Professional Engineer licensed in the State of Texas.
Signed, sealed and dated plans shall be submitted to the City for review and permitting.
9.08 Excavation Support
A. Trench excavation protection shall be used for the installation of linear drainage or utility
facilities that result in trenches deeper than 5’. Such trench protection includes vertical or sloped
cuts, benches, shields, support systems, or other systems providing the necessary protection in
accordance with Occupational Safety Heath Administration (OSHA) Standards and
Interpretations, 29 CFR 1926, Subpart P, “Excavations.”
B. Temporary special shoring is used for installations of walls, footings, and other structures that
require excavations deeper than 5’. Temporary special shoring is designed and constructed to
hold the surrounding earth, water, or both out of the work area. It provides vertical or sloped
cuts, benches, shields support systems, or other systems to provide the necessary protection in
accordance with the approved design. Unless a complete design for temporary special shoring
systems are included in the plans, the contractor is responsible for the design of the temporary
special shoring system. The Contractor must submit to the City, for informational purposes only,
the design calculations and details sealed by a Professional Engineer licensed in the State of
Texas before constructing the shoring. The design of the shoring must provide protection in
accordance with Occupational Safety Heath Administration (OSHA) Standards and
Interpretations, 29 CFR 1926, Subpart P, “Excavations.”
9.09 Construction Plans
A. Constructions drawings and technical specifications for all structural construction shall include
the following:
1. Design engineer’s seal, date, signature, and Texas Board of Professional Engineers (TBPE)
firm registration number;
2. Name and date of issue of the codes and supplements to which the design conforms;
Section 9 – Structural Design Requirements May 2012 Page 9-9