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603284-001 <br />5.0 RECOMMENDATIONS <br />The proposed new buildings and structures may be supported on spread-type shallow <br />foundation systems established in engineered fill or undisturbed natural soils. The <br />following preliminary geotechnical recommendations have been developed based on <br />the engineering properties of the onsite soils and their anticipated behavior during and <br />after construction. Leighton should review the grading plans, shoring plans, foundation <br />plans, and specifications when they are available to verify that the recommendations <br />presented in this report have been properly interpreted and incorporated. <br />5.1 Earthwork and Gradina <br />All earthwork and grading should be performed in accordance with the following <br />recommendations and Earthwork and Grading Guide Specifications presented in <br />Appendix F. <br />5.1.1 Site Preparation <br />Prior to construction, the area of proposed new buildings and structures <br />including site walls, e.g. retaining and freestanding walls, should be <br />cleared of any vegetation and demolition trash and debris. These <br />materials should be removed from the site. Any underground obstructions <br />onsite should be removed. The foundations for the existing buildings to be <br />demolished should be located and removed. <br />Efforts should be made to locate any existing utility lines to be removed or <br />rerouted where interfering with the proposed construction. Any resulting <br />cavities should be properly backfilled and compacted. After the site is <br />cleared, the soils should be carefully observed for the removal of all <br />unsuitable deposits. All undocumented fill should be excavated from <br />below proposed buildings, retaining walls, and concrete slabs on grade. <br />All existing fill, including backfill placed after US removal, is considered <br />undocumented fill until certification documentation becomes available. <br />Existing fill may be left in place below planned asphalt concrete (AC) <br />pavement if the associated risk of increased maintenance is deemed <br />acceptable. All areas with existing fill left in place should be proof-rolled <br />with heavy construction equipment to identify sofUloose zones for removal <br />and recompaction. <br />-19- <br />Leighton