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October 25, 2015 <br /> YMCA - Everett <br /> L&A Job No. 15-089 <br /> Page 12 <br /> should be placed in lifts no more than 10 inches thick in its loose state, with each lift <br /> compacted to a minimum percentage of the maximum dry density determined by ASTM <br /> D1557 (Modified Proctor Method) as follows: <br /> Application °A° of Maximum Dry Density <br /> Within building pad and under foundations 95% <br /> Roadway/driveway subgrade 95% for top 3 feet and 90% below <br /> Retaining wall backfill 92% <br /> Utility trench backfill 95% for top 4 feet and 90% below <br /> BUILDING FOUNDATIONS <br /> Conventional footing foundations may be used to support the proposed multi-use building in <br /> accordance with the following recommendations. Footprint excavation for the building <br /> should be excavated to at least 4.5 to 5.0 feet deep with the bottom of excavation reaching <br /> the underlying, dense, advance outwash deposit. The exposed soil at bottom of excavation <br /> should be thoroughly compacted to a non-yielding state with a vibratory mechanical <br /> compactor. Standing water and loose disturbed soils in footing trenches should be <br /> thoroughly removed down to dense native advance outwash soil prior to pouring concrete <br /> for footing foundations. <br /> If the above recommendations are implemented and observed, our recommended design <br /> criteria for footing foundations are as follows: <br /> LIU & ASSOCIATES, INC. <br />