2505 PACIFIC AVE 2018-01-01 MF Import

Sierra Construction Services, Inc. JN 92276 July 1 , 1992 Page 12 the potential need to import granular fill . The on•-site soils are generally silty and thus are moisture sensitive. Grading operations will be difficult whe� the moisture content of these soils exceeds the optimum moisture content. ' The moisture content of the existing sandy site fill soils must be at or near the optimum moisture content as they cannot be consistentiy compacted to the required ' density when the moisture content is greater than optimum. Based on the site topography, we do not anticipate that any native soils will be excavated except for possibly utility trenches. The native soils are not suitable for structural fill , including utility trench backfill . The soil placed bY eurlington Northern on the west side of the property is predominately silt and should not be used for structural fill . The moisture content of the on-site fill soils at the , time of our expiorations was generally near the estimeted optimum moisture content. our explorations were conducted during a long period of dry weather. The , existing sandy fill soils, which are frce of debris and organics , could be used as structural fill if grading operations are conducted during dry weather and when drying of the wet soils by aeration is possible. During excessively dry weather it may be necessary to add Nater to achieve optimum moisture content. Moisture sensitive soils may also be susceptible to excessive softening end "pumping" from construction equipment traffic when the maisture content is greater than the optimum moisture content. Structural fill which is to be pleced. in Net weather should consist of a granular soil having no more than five (5) . percent silt or clay particles . The percentage of particles passing the No.200 sieve should be measured from that portion of the soil passing the three-quarter-inch sieve. We recommend that at least 12 inches of granular fill be placed over the native silts in structural or pavement areas . This is most critical if the work takes place during wet weather . GEOTECH CONSULTANTS , INC.