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American Property Development ES-0599.06 <br /> June 9, 2016 Page 7 <br /> Revised October 16, 2017 <br /> In our opinion, where shoring is necessary, the use of a conventional cantilever or tieback <br /> shoring system is feasible for temporary support of excavations. In our opinion, soil nailing is <br /> also a feasible alternative for excavation shoring. For purposes of this study, we have provided <br /> recommendations for soil nailing, and recommendations for cantilever and tieback shoring. It is <br /> important to note that if tiebacks or soil nails are utilized, appropriate easements will be required <br /> from adjacent property owners to accommodate the tendons and nails, as appropriate. <br /> Preliminary Soil Nail Wall Recommendations <br /> Based on the soil conditions encountered during our fieldwork, the soil conditions are generally <br /> favorable for soil nail walls. For design purposes, the following design parameters can be <br /> considered for temporary soil nail walls: <br /> • Internal Angle of Friction 38 degrees <br /> • Cohesion 250 psf <br /> • Allowable Pullout 4.0 kips per foot <br /> • Soil Moist Unit Weight 125 pcf <br /> • Maximum Nail Spacing 6 feet (horizontal /vertical) <br /> The above design parameters are intended for preliminary analysis of a soil nail wall design. <br /> Modification of these values by the geotechnical engineer may be appropriate during the design <br /> process, based on the results of the analyses. With respect to soil nail shotcrete facing, <br /> temporary or permanent (foundation wall) facing can be considered as part of the top-down <br /> construction. The soil nail wall designer will need to consider shotcrete thickness and <br /> reinforcement requirements, as appropriate for temporary or permanent facings. <br /> Cantilever and Single Tieback Soldier Piles <br /> Temporary shoring should be designed to resist lateral soil pressure based on an active earth <br /> pressure condition. Surcharge loading from adjacent roadways or buildings should be included <br /> in the shoring design, as appropriate. For design, the following earth pressure and surcharge <br /> values should be used: <br /> Earth Solutions NW,LLC <br />