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MainPlace Mall Transformation Project 12126.001 <br />4 CONCLUSIONS AND DESIGN CONSIDERATIONS <br />4.1 Conclusion <br />Based on results of our exploration, the proposed transformation plan for the site is <br />considered feasible from a geotechnical viewpoint. <br />4.2 Design Considerations <br />Presented below are geotechnical considerations and recommendations for the <br />proposed transformation plan and associated developments currently planned for <br />the site. <br />4.2.1 Site Grading <br />Based on the proposed transformation plan, we anticipate site grading will <br />consist of overexcavation of existing site soils to provide support of the <br />new development on engineered fill. On this basis, site grading will likely <br />consist of the following activities: <br />Site Excavation <br />All existing artificial fill (i.e., 5 to 10 feet thick) encountered in our borings <br />within the existing parking lots is considered undocumented. No borings <br />were drilled within existing building footprint. For planning purpose, <br />remedial site excavation recommendations for foundation support of new <br />improvements are presented in the following paragraphs. The <br />recommendations also apply to area where demolition of existing buildings <br />for new construction is proposed. <br />The existing fill soils should not be used for support of new building <br />foundations or foundations of incidental improvements structurally <br />connected to new or existing buildings. The fill should be removed and <br />replaced with engineered fill. Removal of the existing fill should extend <br />into competent native soils to allow installation of at least 2 feet of <br />engineered fill below the bearing grade of the foundations. The <br />removal excavation should extend laterally to a distance equals to the <br />depth of the excavation below the bearing grade of the foundations. <br />11 <br />!oto <br />jo <br />Leighton <br />