C05 Amend 02 Attachment 7 - ASCE Design Criteria.pdf
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- Solicitation number
- 1240LT26Q0103
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Department of Agriculture Forest Service
About this file
This is an ASCE Hazards Report generated from the ASCE Hazard Tool providing environmental and structural design parameters for a location at latitude 37.315372, longitude -119.040167, and elevation 7,405.13 feet (NAVD 88). The report applies ASCE/SEI 7-22 standards and designates the site as Risk Category II with default soil classification.
The wind hazard analysis indicates a primary wind speed of 95 Vmph (700-year mean recurrence interval), with service-level speeds ranging from 66 Vmph (10-year MRI) to 82 Vmph (100-year MRI), and ultimate-level speeds extending to 150 Vmph (1,000,000-year MRI). The site qualifies as a special wind region requiring examination for unusual wind conditions and Authority Having Jurisdiction review. All values represent 3-second gust wind speeds at 33 feet above ground in Exposure C Category. The site is not located in a hurricane-prone region. Seismic analysis yields a Seismic Design Category D with peak ground acceleration (PGAM) of 0.65g, spectral response acceleration at short period (SMS) of 1.73g, spectral response acceleration at 1-second period (SM1) of 1.02g, and design spectral accelerations (SDS and SD1) of 1.15g and 0.68g respectively, with VS30 soil velocity of 260 m/s. Snow load design parameters specify a ground snow load (pg) of 486 lb/ft² with a 20-year MRI value of 205.92 lb/ft², mapped elevation of 7,454.9 feet, and a winter wind parameter of 0.25. All data was accessed on September 21, 2026, from USGS Seismic Design Maps and ASCE/SEI 7-22 figures.
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ASCE Hazards Report Address:
No Address at This Location
Standard: ASCE/SEI 7-22 Latitude: 37.315372
Risk Category: II Longitude: -119.040167
Soil Class: Default Elevation: 7405.13382225627 ft (NAVD 88)
Wind
Results:
Wind Speed 95 Vmph
10-year MRI 66 Vmph
25-year MRI 72 Vmph
50-year MRI 77 Vmph
100-year MRI 82 Vmph
300-year MRI 89 Vmph
700-year MRI 95 Vmph
1,700-year MRI 102 Vmph
3,000-year MRI 106 Vmph
10,000-year MRI 115 Vmph
100,000-year MRI 132 Vmph
1,000,000-year MRI 150 Vmph
Data Source: ASCE/SEI 7-22, Fig. 26.5-1B and Figs. CC.2-1–CC.2-4, and Section 26.5.2Date Accessed: Mon Sep 21 2026
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Special Wind Region -- This site is in a special wind region as shown in Fig. 26.5-1 and should be examined for unusual wind conditions. The Authority Having Jurisdiction shall, if necessary, adjust the values given in Fig. 26.5-1 to account for higher local wind speeds. Such adjustment shall be based on meteorological information and an estimate of the basic wind speed obtained in accordance with the provisions in Section 26.5.3.
Value provided is 3-second gust wind speeds at 33 ft above ground for Exposure C Category, based on linear interpolation between contours. Wind speeds are interpolated in accordance with the 7-22 Standard. Wind speeds correspond to approximately a 7% probability of exceedance in 50 years (annual exceedance probability = 0.00143, MRI = 700 years). Values for 10-year MRI, 25-year MRI, 50-year MRI and 100-year MRI are Service Level wind speeds, all other wind speeds are Ultimate wind speeds.
Site is not in a hurricane-prone region as defined in ASCE/SEI 7-22 Section 26.2.
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PGA M : 0.65
SMS : 1.73
SM1 : 1.02
SDS : 1.15
SD1 : 0.68
TL : 6
SS : 1.46
S1 : 0.4
VS30 : 260
Seismic Design Category: D
Multi-Period Design Spectrum
S (g) vs T(s)a
Multi-Period MCE SpectrumR
S (g) vs T(s)a
Two-Period Design Spectrum
S (g) vs T(s)a
Two-Period MCE SpectrumR
S (g) vs T(s)a
Design Vertical Response Spectrum
Vertical ground motion data has not yet been made available by USGS.
MCE Vertical Response SpectrumR
Vertical ground motion data has not yet been made available by USGS.
Seismic
DefaultSite Soil Class:
Results:
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Data Accessed: Mon Sep 21 2026
Date Source:
USGS Seismic Design Maps based on ASCE/SEI 7-22 and ASCE/SEI 7-22 Table 1.5-2. Additional data for site-specific ground motion procedures in accordance with ASCE/SEI 7-22 Ch. 21 are available from USGS.
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Snow
Results:
Ground Snow Load, p : 486 lb/ftg
20-year MRI Value: 205.92 lb/ft^2
Winter Wind Parameter: 0.25
Mapped Elevation: 7454.9 ft
Data Source: ASCE/SEI 7-22, Figures 7.6-1 and 7.6-2 A-D
Date Accessed: Mon Sep 21 2026
Values provided are ground snow loads. In areas designated "case study required," extreme local variations in ground snow loads preclude mapping at this scale. Site-specific case studies are required to establish ground snow loads at elevations not covered.
Snow load values are mapped to a 0.5 mile resolution.
This resolution can create a mismatch between the mapped elevation and the site-specific elevation in topographically complex areas. Engineers should consult the local authority having jurisdiction in locations where the reported ‘elevation’ and ‘mapped elevation’ differ significantly from each other.
Ground Snow Loads for IRC only, p :g(asd) 340.2 lb/ft
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File details come from the government source that posted it. Updated .