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Design <br /> Soldier Piles <br /> Several pile designs were considered based on different wall heights. <br /> Soldier pile design calculation sheets are included in Appendix A. <br /> Deflection Estimate <br /> Based on previous experience with soils similar to those present on this site, including loose fill and <br /> glacial till, and as indicated by our attached deflection calculation, we estimate that the deflection <br /> measured at the face of the top of the shoring walls is not expected to exceed 1-in maximum. <br /> Timber Lagging <br /> The timber lagging was designed using the recommend thickness presented in the table in WSDOT <br /> Standard Specifications section 6-16.3(6)B. The fill primarily consists of loose silty sands and gravel and is <br /> classified as Soil Type 2.The dense granular deposits below the fill is considered Soil Type 1. For both <br /> soil types, 4x timber lagging is acceptable for all lagging on site. <br /> WSDOT allows temporary timber lagging for soldier pile walls to be untreated timber, Douglas Fir-Larch <br /> #2 or better, per sections 6-16.3(6)B and 9.09.2(1). <br />