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<br />Geotechnical Engineering Report <br />Eagleview Drainage Channel <br />Southwest of "F" Street and 35`h Avenue <br />Terracon Project No. 21035051 Terracon <br />Lateral Earth Pressures <br />For soils under undrained conditions, recommended equivalent fluid pressures for unrestrained <br />foundation elements are: <br />• Active: <br />Cohesionless soil backfill (on-site sand) ................................. 85 psf/ft <br />• Passive: <br />Cohesionless soil backfill (on-site sand) ...............................325 psf/ft <br />• Coefficient of base friction ...........................................................0.35* <br />*The coefficient of base friction should be reduced to 0.30 when used in conjunction <br />with passive pressure. <br />Where the design includes restrained elements, the following equivalent fluid pressures are <br />recommended: <br />• At rest: <br />Cohesionless soil backfill (on-site sand) ...............................125 psf/ft <br />The lateral earth pressures herein do not include any factor of safety. Fill against retaining walls <br />should be compacted to densities specified in Earthwork. Compaction of each lift adjacent to walls <br />should be acwmplished with hand-operated tampers or other lightweight compactors. <br />Overcompaction may cause excessive lateral earth pressures which could result in wall movement. <br />Seismic Considerations <br />The project site is located in Seismic Risk Zone I of the Seismic Zone Map of the United States as <br />indicated by the 1997 Uniform Building Code. Based upon the nature of the subsurface materials, a <br />soil profile type Sd should be used for the design of structures for the proposed project (1997 Uniform <br />Building Code, Table No. 16-J). <br />5 <br />