Laserfiche WebLink
Aulik Associates <br /> Project BL-04-06716 <br /> October 11,2004 <br /> Page 6 <br /> operating in vibratory mode where possible. Placement with thin lifts, 6 inches or less, and compacting <br /> in static mode may be necessary to minimize the pumping of groundwater into the engineered fill being <br /> placed. <br /> C.4. Foundations <br /> C.4.a Depth. We recoxnmend that the perimeter footings bear a minimum of 3 1/2 feet below the <br /> exterior grade for frost protection. Interior footings ma.y be placed immediately beneath the slab. <br /> Foundation elernents in unheated areas should be founded at least 5 feet below exterior grade for frost <br /> protection. If winter construction is being considered, we recommend that interior footings also beax a <br /> inimum of 3 1/2 feet below grade for frost protection. <br /> C.4.b. Subgrades. At these depths, we anticipate that the majority of the carriage home's footings will <br /> bear on native granular soils or granular engineered fill. <br /> � C.4.c. Bearing Pressnre. It is our opinion that the footings placed on native granular soils or <br /> engineered fill may be designed for a net allowable bearing pressure up to 2,000 pounds per square foot. <br /> C.4.d. Settlement. We anticipate total and differential settlement of the foundations will be less than <br /> 1 inch and 1/2 inch,respectively under the assumed loads. Residential construction similar to the <br /> proposed carriage home can generally tolerate settlement of this ma.gnitude. <br /> C.S. Floor <br /> C.S.a. Subgrade. After the carriage home pad preparation has been completed,we anticipate the floor <br /> subgrade will be granular engineered fill. It is our opinion these soils should be directly suitable for floor <br /> slab support with only a�limited risk of settlement. Bacl�ll in footing and mechanical trenches should be <br /> compacted to a minimum of 95 percent of its standard Proctor maximum dry density and within 3 percent <br /> of the optimum moisture content. <br /> C.S.b. Vapor Barrier. If floor coverings or coatings less permeable than the concrete slab will be used, <br /> or if moisture is a concern, we recomynend a vapor retarder be placed beneath the slab. (Some coverings, <br /> coatings or situations may require a vapor barrier, i.e., a membrane with a permeance less than 0.3 <br /> perrns). We recommend placing the vapor retarder or barrier beneath the concrete floor slab and above a <br />