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ES-0599.06 <br /> American Property Development <br /> June 9, 2016 Page 8 <br /> Revised October 16, 2017 <br /> • Active Earth Pressure (level backfill) 30 pcf(equivalent fluid / loose fill) <br /> • At-Rest Earth Pressure (level backfill) 48 pcf <br /> • Active Earth Pressure (sloped backfill, 1:1 max) 50 pcf* <br /> • At-Rest Earth Pressure (sloped backfill, 1:1 max) 70 pcf* <br /> • Traffic Surcharge (where appropriate) 70 psf(rectangular distribution) <br /> • Preliminary Building Surcharge (where applicable) 125 psf(rectangular distribution)** <br /> • Passive Resistance (Apply over 2 pile diameters) 400 pcf <br /> *Preliminary values, based on ten-foot-high broken slope above shoring. Values should be reevaluated based on <br /> final slope geometry. <br /> **Building surcharge values should be reevaluated based on further assessment of adjacent building foundation <br /> levels, proximity, and loading. <br /> Active Earth Pressures <br /> A typical earth pressure distribution for an Active Earth Pressure condition is provided on Plate <br /> 3 of this study. Allowable soldier pile deflections for walls subjected to Active Earth Pressures <br /> should be limited to approximately one-inch. <br /> At-Rest Earth Pressures <br /> At-Rest pressures should be used where the shoring system will support adjacent foundation <br /> loads, and where deflection of the shoring wall and adjacent ground subsidence must be <br /> minimized. Where some defection is determined to be acceptable, an earth pressure based on <br /> a value that is between the At-Rest and Active values may also be considered, as <br /> recommended by the geotechnical engineer. Recommendations for allowable soldier pile <br /> deflections can be provided once the alignment and proximity of shoring walls to adjacent <br /> structures has been established. The geotechnical engineer should review the shoring wall <br /> design, and provide supplement earth pressure and building surcharge recommendations, as <br /> appropriate. Where At-Rest Earth Pressures are applied, a triangular distribution of pressure <br /> similar to the distribution illustrated on Plate 3 should be used. <br /> Multiple Tieback Walls <br /> Where deeper shored excavations will be necessary to construct the garage levels, a multiple <br /> tieback wall may be necessary. As illustrated on Plate 4 (Multiple Tieback Wall), an apparent <br /> earth pressure distribution should be used to design multiple tieback walls. The following <br /> design parameters should be used for multiple tieback walls: <br /> Earth Solutions NW,LLC <br />