HomeMy WebLinkAboutMISC_Fall Radius Letter_20221201_v1Truc Lac, PE. SE.
Senior Project Engineer
Tower Assets
Tel 713-570-3849
Truc.lac@crowncastle.com
Crown Castle
2000 Corporate Drive
Canonsburg, PA 15317
Date: August 18, 2022
Subject: Code Compliance Letter
Crown Castle Designation: BU Number: 831070
Site Name:A-Team
Site Data: 2902 NE 12th St, Renton, WA
Latitude 47° 30ƍ 13.92Ǝ, Longitude -122° 10ƍ 49.94Ǝ
94 Foot – Monopole Tower
This letter is to attest to the structural integrity of the Crown Castle owned tower at the above-mentioned
address. Crown Castle structures are designed in conformance with the Telecommunication Industry
Association Standard (TIA), which is referenced in the building code adopted by the governing local
jurisdiction. This tower structure has been designed on August 08,2022, in accordance with the
requirements of the 2018 International Building Code and the referenced TIA Standard, TIA-222-H,
considering a 98 mph ultimate 3-second gust wind speed. The tower and foundation were designed to be
in conformance with current building code requirements.
The design wind loads per ASCE 7-16, Minimum Design Loads for Buildings and Other Structures
(referenced in the 2018 IBC), have a mean recurrence interval of 700 years (i.e. the probability of a
design level wind event in any given year is 1/700, or 0.143%). The design seismic (i.e. earthquake) loads
based on ASCE 7-16 are intended to result in structures that have a 1% probability of collapse in 50
years, which is equivalent to a mean recurrence interval of 4975 years, or 0.0201%. Note that wind
effects control over seismic effects for this tower. Extreme weather conditions (e.g. tornadoes), excessive
corrosion, vehicle impact, or damage due to vandalism are outside of this scope of design and are
examples of conditions that might result in tower damage, and in rare instances, tower collapse.
Corrosion resistant coatings, regular inspection and maintenance, and fencing around the tower
compound are intended to minimize these risks. However, based on the information in the preceding
paragraph and to the best of our knowledge, we can state that the tower has been designed in
accordance with the manufacturer’s specifications, meets the requirements of the building code, and
therefore presents no safety issues to adjacent properties at this time. Therefore, it is the position of
Crown Castle Engineering that the tower has a theoretical fall zone under the design requirements of the
building code of zero feet.
Please contact the undersigned with any questions.
Truc Lac, P.E., S.E.
Senior Project Engineer
08/18/22
License Expires: 02/24/20