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Geotechnical Engineering ftgptirt Irerracon <br /> SN4924—Silver Lake North Cell Tower Everett, Washington <br /> October 24, 2014 Terracon Project No. 81145043 <br /> 4.2.4 Compaction Requirements <br /> Item Description <br /> Fill Lift Thickness 8 inches or less in loose thickness <br /> Compaction' 95% of the material's modified Proctor maximum dry density (ASTM D 1557) in <br /> foundation areas and 92% elsewhere. <br /> Moisture Content Within two percent of the optimum moisture content as determined by the <br /> modified Proctor test at the time of placement and compaction <br /> 1. Fill should be tested frequently for moisture content and compaction during placement. Should <br /> the results of the in-place density tests indicate the specified moisture or compaction limits <br /> have not been met; the area represented by the test should be reworked and retested as <br /> required until the specified compaction is achieved. This may require adjustment of the <br /> moisture content. <br /> 4.2.5 Grading and Drainage <br /> Positive drainage away from the proposed structure should be provided during construction and <br /> maintained throughout the life of the proposed project. Infiltration of water into excavations should <br /> be prevented during construction. All grades should provide effective drainage away from all <br /> structures during and after construction. <br /> 4.2.6 Earthwork Construction Considerations <br /> The site should be graded to prevent ponding of surface water on the prepared subgrades or in <br /> excavations. If the subgrade should become frozen, desiccated, saturated, or disturbed, the <br /> affected material should be removed or these materials should be scarified, moisture <br /> conditioned, and recompacted prior to footing or floor slab construction. <br /> Temporary excavations should be sloped or braced as required by Occupational Health and <br /> Safety Administration (OSHA) regulations to provide stability and safe working conditions, and <br /> comply with applicable local, state and federal safety regulations. The grading contractor is <br /> responsible for designing and constructing stable, temporary excavations and should shore, <br /> slope or bench the sides of the excavations as required, to maintain stability of both the <br /> excavation sides and bottom. <br /> 4.3 Foundation Recommendations <br /> Based on the results of this exploration, it is our opinion that the site is suitable for the proposed <br /> construction using a drilled shaft foundation or a concrete mat foundation. <br /> 4.3.1 Drilled Shaft Foundations <br /> Recommended soil properties and design parameters to be used in the design of the drilled <br /> shaft foundations are included in the following tables. The values included in the tables were <br /> estimated based on the observed subsurface conditions during our field exploration, visual <br /> classifications, and presumptive values for similar materials. Note that the soil parameters are <br /> not intrinsic values of the soil, and depend on the state of the soil (density, depositional history, <br /> Responsive■ Resourceful■ Reliable 5 <br />