DRAFT <br />distances, soil conditions, and source mechanisms that are consistent with the earthquakes <br />that dominate the seismic hazard at the project site. The multiperiod MCER horizontal and <br />vertical response spectra discussed above were utilized as target response spectra for <br />development of the time histories. The ground-motion modifications were completed <br />utilizing spectral matching. Appendix C provides the site-specific time histories and <br />additional details and discussions regarding the ground-motion development for <br />nonlinear RHA for the project. <br />5.7.3 Liquefaction and Other Seismic Hazards <br />Based on the estimated depth to groundwater and the relative density of the granular soils <br />below the groundwater level at the site, it is our opinion the risk of liquefaction and/or soil <br />strength at the site is low during a code-based earthquake. In our opinion, any potential <br />minor strength loss in isolated zones of looser and/or softer soils at the site will not result <br />in a loss of support or significant additional settlement beneath shallow foundations. <br />Based on our review of the USGS interactive fault maps, no mapped crustal faults are <br />located in close proximity to the site. Unless occurring on a previously unmapped or <br />unknown fault, it is our opinion the risk of ground rupture at the site is low. The risk of <br />damage by tsunami and/or seiche at the site is absent. <br />6 DESIGN REVIEW AND CONSTRUCTION SERVICES <br />We welcome the opportunity to review and discuss construction plans and specifications <br />for this project as they are being developed. In addition, GRI should be retained to review <br />all geotechnical-related portions of the plans and specifications to evaluate whether they <br />are in conformance with the recommendations provided in our report. To observe <br />compliance with the intent of our recommendations, the design concepts, and the plans <br />and specifications, we are of the opinion all construction operations dealing with <br />earthwork and foundations should be observed by a GRI representative. Our construction- <br />phase services will allow for timely design changes if site conditions are encountered that <br />are different from those described in our report. If we do not have the opportunity to <br />confirm our interpretations, assumptions, and analyses during construction, we cannot be <br />responsible for the application of our recommendations to subsurface conditions that are <br />different from those described in this report. <br />7 LIMITATIONS <br />This preliminary report has been prepared to aid the architect and engineer in the design <br />of this project. It should be understood that the project are still in a preliminary design <br />phase, and further geotechnical engineering analyses will be required to support final <br />design. The scope is limited to the specific project and location described herein, and our <br />description of the project represents our understanding of the significant aspects of the <br />project relevant to the design and construction of the new structures. In the event that any <br />GRI #6497-A - 2.MO Indoor Football Practice Facility Page 22 <br />August 26, 2021 <br />