1716 EDGEMOOR LN 2016-01-01 MF Import

Roth Quality Homes JN 90016 January 25, 1990 Page 5 around the outside of the foundation . we recommend the following design values be used for the foundation' s resistance to lateral loading: Design Parame er Value . Coefficient of Friction 0 . 35 Passive Earth Pressure 250 pcf Where• ( 1 ) pcf is pounds per cubic foot (2 ) Passive Earth Pressure is computed using the equivalent fluid density. We recommend that a safety factor of at least .l . 5 be used for design of the Eoundation' s resistance to lateral loading. DRTL•LED CONCRETE PSERS Drilled, concrete-filled piers may be used if it is uneconomical to excavate to bearing soils. Based on our test pits, it appears that the piers can be constructed by open hole methods . These piers should be drilled with con��entional auger drills; however , the drilling contractor should have access to casing, in case sloughing occurs in the near-surface soils . Concrete should not be allowed to free-fall to the bottom of the hole, but either pumped or tremied into the hole. Additionally, if water is present in the hole at the time of pouring, the concrete should be tremied to the bottom of the hole. A wide variety of depths and pier diameters are possible; however , we recommend using a minimum pier diameter of sixteen (16 ) inches . For a minimum embedment of ten ( 10 ) feet into the native, hard silt and a pier diameter of sixteen inches, we recommend that an allowable compressive capacity of fifteen ( 15 ) tons per pier be assumed. The lateral capacity of the piers is a function of both the soil that surrounds the pier and the composition of the pier itself . We recommend that the piers be designed to cantilever for the upper ten (10 ) feet, with an equivalent fluid pressure GEOTECH CONSULTANTS , INC.