657-507_Marion_CorrectSeisDef - Appendix - Geotech Report GMHA Seismic Report 1.pdf

11600 Lilburn Park Road

St. Louis, Missouri 63146

P (314) 692-8811

Terracon.com

September 8, 2025

Above Group Inc.

305 East Dr Ste H

Melbourne, Florida 32904

Attn: Mr. Stephen Kazim

Re: Ground Motion Hazard Analysis Report

Seismic Correction Marion Building 14

Marion, Illinois

Terracon Project No. 15255149

Dear Mr. Kazim:

Terracon Consultants, Inc. (Terracon) has completed a ground motion hazard analysis report for the above-referenced project. Our August 29, 2025 Geotechnical Engineering Report describes the site and project and provides our engineering recommendations and interpretations of geotechnical explorations. This ground motion hazard analysis was performed in general conformance with our proposal dated June 6, 2025 and change order dated August 22, 2025.

Shear Wave Velocity Testing and Site Class

Terracon performed a Multi-Channel Analysis of Surface Waves (MASW) survey at the site using one array to determine the ASCE 7-22 Site Class. The profile is attached in tabular and graphic form. The time-averaged shear wave velocity (𝑉̅𝑆) in the upper 100 feet of the profile is approximately 1,303 feet/second (397 m/s). This 𝑉̅𝑆 value indicates a Site Class CD for seismic design.

Applicable Codes and Standards

The basis of design is the 2024 International Building Code (2024 IBC) which references ASCE

7-22 for seismic loading. Per ASCE 7-22, the design earthquake ground motions are two-thirds of the risk-targeted Maximum Considered Earthquake (MCER) which is defined as a 1 percent chance of structure collapse in 50 years. The ASCE Hazard Tool report for Site Class

Ground Motion Hazard Analysis Report

Marion Building 14 ■ Marion, Illinois

September 8, 2025 ■ Terracon Project No. 15245149

Facilities | Environmental | Geotechnical | Materials 2

CD is attached and presents the spectral acceleration values derived from ASCE Hazard Tool for the applicable Site Class1.

Site-Specific Ground Motion Study

The disaggregation reports were obtained using the 2018 update of the U.S. Geological Survey

(USGS) national seismic hazard model (NSHM). These reports are based on the shear wave velocity profile from the site for Vs30 = 397 m/s (VS100 = 1,303 feet/second). The disaggregation reports for peak ground acceleration at the MCER hazard level is attached. The primary contributor to the ground shaking hazard is gridded seismicity (background seismicity) with elements of the New Madrid Seismic Zone and Wabash Valley contributing fault-related sources.

Site-Specific Spectra and Design Acceleration Parameters

The ground motion hazard analysis performed followed the procedure in ASCE 7-22 Section

21.2. Spectral accelerations for the MCER and Design ground motions were derived from the

USGS Seismic Design Geodatabase (USGS ASCE 7-22 Web Services). ASCE 7-22 Section 21.3 states that the design spectral response acceleration at any period shall be determined by multiplying the site-specific MCER spectral response accelerations by two-thirds.

Figure 1 shows the spectral values for the site-specific MCER and design response spectra.

1 https://ascehazardtool.org/

0.0

0.5

1.0

1.5

0.00 1.00 2.00 3.00 4.00 5.00

S p e c tr a l A c c e le ra ti o n g

Period (seconds)

Site-Specific

MCER

DRS

Facilities | Environmental | Geotechnical | Materials 3

Figure 1. Comparison of Design Response Spectra (5% damping)

Table 1 lists the tabular values of each of the spectral accelerations shown in Figure 1.

Table 1 - MCER Target Spectral Acceleration Values (5% damping)

Period (sec) Site-Specific MCER (g) Design Response Spectrum (g)

0.0 0.56 0.37

0.01 0.62 0.41

0.02 0.75 0.50

0.03 0.87 0.58

0.05 1.03 0.69

0.075 1.09 0.73

0.1 1.24 0.83

0.15 1.33 0.89

0.2 1.18 0.79

0.25 1.08 0.72

0.3 0.98 0.65

0.4 0.86 0.57

0.5 0.77 0.51

0.75 0.62 0.41

1 0.51 0.34

1.5 0.35 0.2

2 0.27 0.18

3 0.17 0.11

4 0.11 0.07

5 0.08 0.06

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Seismic Design Parameters

The Seismic Design Parameters have been generated using the ASCE Hazard Tool. This web-based software application calculates seismic design parameters in accordance with

ASCE 7-22 and are presented in the table below.

Parameter Value

Site Classification 1 CD

Site Latitude 37.7244° N

Site Longitude 88.9524° W

Mapped Spectral Acceleration Parameters SS = 1.06 and S = 0.29

Spectral Response Acceleration Parameters SMS = 1.07 and SM1 = 0.51

Design Spectral Acceleration Parameters SDS = 0.71 and SD1 = 0.34

Design Peak Ground Acceleration PGAM = 0.53g

Disaggregated Mean Magnitude 2 6.6

1. Seismic site classification in general accordance with ASCE 7-22, Chapter 20.

2. USGS Earthquake Hazard Toolbox https://earthquake.usgs.gov/nshmp.

GENERAL COMMENTS

The analysis and recommendations presented in this report are based upon the data obtained from explorations performed by Terracon and from other information discussed in this report.

This report does not reflect variations that may occur between explorations, across the site, or due to the modifying effects of construction or weather. The nature and extent of such variations may not become evident until during or after construction. If variations appear, we should be immediately notified so that further evaluation and supplemental recommendations can be provided.

Our scope of services does not include either specifically or by implication any environmental assessment of the site or identification or prevention of pollutants, hazardous materials or conditions. If the owner is concerned about the potential for such contamination or pollution, other studies should be undertaken.

Facilities | Environmental | Geotechnical | Materials 5

This report has been prepared for the exclusive use of our client for specific application to the project discussed and has been prepared in accordance with generally accepted geotechnical engineering practices. No warranties, either expressed or implied, are intended or made. In the event that changes in the nature, design, or location of the project as outlined in this report are planned, the conclusions and recommendations contained in this report shall not be considered valid unless Terracon reviews the changes and either verifies or modifies the conclusions of this report in writing.

CLOSURE

We appreciate the opportunity to be of service to you on this project. If you have any questions concerning this report, or if we may be of further service, please contact us.

Sincerely, Terracon Consultants, Inc.

Nic A. Arens, P.E. (MO) Joseph J. Caciola, Jr., P.E.

Senior Geotechnical Engineer Senior Engineer

Illinois No. 062.076992

Renews 11/30/2025

SME Review: John S. McKeown, E.G. (CA)

Senior Geologist

Attachments

Multi-Channel Analysis of Surface Waves (MASW) Profile

USGS Disaggregation Report

ASCE Hazard Tool – Site Class CD

09/08/2025

0 12 12 18 18 26 26 35 35 46 46 60 60 76 76 95 95 100

Depth Interval (feet)

Midpoint Location (WGS84):

37.724342, -88.952239

Tested By: MW/WK ExhibitShear Wave Velocity Test

Shear Wave Velocity (ft/s)

Equipment:

Geometrics Seismograph, 24-ch

Method: MASW - Active and Passive Date: 08/2025

Marion, IllinoisProject Number: 15255149

Seismic Correction Marion Building 14 1

0 1000 2000 3000 4000

D ep th ft

Shear-Wave Velocity (ft/s)

Line 1

Line 1 Vs100' = 1303 ft/s

Shear Wave Evaluation

ASCE Hazards Report Address:

No Address at This Location

Standard: ASCE/SEI 7-22 Latitude: 37.7244

Risk Category: IV Longitude: -88.9524

Soil Class: CD Elevation: 450.96866919477645 ft

(NAVD 88)

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PGA M : 0.53

SMS : 1.07

SM1 : 0.51

SDS : 0.71

SD1 : 0.34

TL : 12

SS : 1.06

S1 : 0.29

VS30 : 365

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

CDSite Soil Class:

Results:

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Data Accessed: Wed Sep 03 2025

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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The ASCE Hazard Tool is provided for your convenience, for informational purposes only, and is provided “as is” and without warranties of any kind. The location data included herein has been obtained from information developed, produced, and maintained by third party providers; or has been extrapolated from maps incorporated in the ASCE standard. While ASCE has made every effort to use data obtained from reliable sources or methodologies, ASCE does not make any representations or warranties as to the accuracy, completeness, reliability, currency, or quality of any data provided herein. Any third-party links provided by this Tool should not be construed as an endorsement, affiliation, relationship, or sponsorship of such third-party content by or from ASCE.

ASCE does not intend, nor should anyone interpret, the results provided by this Tool to replace the sound judgment of a competent professional, having knowledge and experience in the appropriate field(s) of practice, nor to substitute for the standard of care required of such professionals in interpreting and applying the contents of this Tool or the ASCE standard.

In using this Tool, you expressly assume all risks associated with your use. Under no circumstances shall ASCE or its officers, directors, employees, members, affiliates, or agents be liable to you or any other person for any direct, indirect, special, incidental, or consequential damages arising from or related to your use of, or reliance on, the Tool or any information obtained therein. To the fullest extent permitted by law, you agree to release and hold harmless ASCE from any and all liability of any nature arising out of or resulting from any use of data provided by the ASCE Hazard Tool.

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