The Mark at Eugene January 6, 2026 <br />Geotechnical Investigation and Seismic Hazard Study 14 Project No.: 2251077 <br />Eugene, Oregon Landmark Construction, LLC <br />Foundation Design <br />We recommend foundations be designed in accordance with the following <br />recommendations. <br />9. Design the footings using an allowable bearing pressure of 2,000 psf. A <br />one-third increase in the allowable bearing pressure may be assumed for <br />transient (i.e., wind and seismic) loading. The foundation soil should be <br />confirmed by a representative of FE at the time of construction. <br />10. Assume the foundations described above may have total settlement up to ¾ <br />inch (if the footings are designed and constructed as recommended herein). <br />Differential settlement between adjacent footings (within ±30 feet) may be <br />assumed to be ½ inch or less. <br />11. Design the structures using the 2022 OSSC seismic parameters provided on <br />Figure 3A. <br />12. A coefficient of friction of 0.5 and allowable passive resistance of 150 psf <br />should be used for sliding analysis. <br />13. Use a modulus of subgrade reaction, ks, of 50 kcf for the design of mats and <br />slabs. Reinforce all mats, footings, and slabs to reduce the risk of cracking <br />and warping. <br />Site Preparation and Foundation Construction <br />Excavation and site preparation will require removal of existing structures, <br />basements, and pavements and may require installation of shoring and dewatering <br />systems. We recommend the excavation be completed as follows: <br />14. Install the shoring and dewatering systems, where appropriate. The selected <br />systems will be a function of the contractor’s preferred means and methods <br />but must provide for relatively dry excavation and backfilling condition. <br />Geotechnical recommendations may be required as part of the shoring <br />submittal, based on the selected system. <br />15. Demolish and remove all existing buildings, building debris, foundations, <br />basements, pavements, utilities, etc. from the footprint of the new building. <br />Haul and dispose of these materials off site. <br />16. Excavate the slab areas to remove unsuitable fill and debris and to provide a <br />minimum of 18 inches of Base Aggregate beneath slabs. The excavation <br />should be observed by a representative of FE to confirm the soil and need for <br />additional excavation, if required.