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0 J. H. KLEINFELDER & ASSOCIATES File No. S-2599-1 March 3, 1983 P age 7 engineer be retained who is familiar with this system. One with whom we have worked is Mr. Michael Rose, 6958 Brighton Drive, Dublin, CA 94466, (415) 828-1702. Whoever provides the structural design should prepare his work in accordance with the Post Tensioned Institute's design procedures. We recommend the system be designed based on a differential soil movement as follows: Center Lift Movement Conditions: 1.50 Inches Edge Lift Movement Conditions: 0.75 Inches A maximum allowable bearing pressure of 1,500 pounds per square foot is recommended for the grade beams. A contractor familiar with this type of construction is Blazer Construction Company, 5031 Point Prim Court, Carmichael, California 95608, 916/483-1718. Site Pre2aration and Grading Site preparation should include the stripping and removal of all vegetation and debris, including trees and their root systems, from the area of construction. The actual depth of stripping should be determined in the field by a representative of our firm. All stripped vegetation and debris should be removed from the site, and not incorporated in any of the structural fills. The voids left by the removal of roots should be cleaned of all loose soils, and properly backfilled with engineered fin. After stripping and removal of vegetation and debris, the exposed surface soil within, and to a minimum of 5 feet beyond the building area, should be scarified to a minimum depth of 6 inches, and recompacted to 90 percent of the maximum dry density as determined by the ASTM D-1557-70 test procedure. If any fill is required to bring the site to finished grade, we recommend that the soil used as engineered fill consist of on-site soils or imported granular nonexpansive soil having a maximum percentage passing the No. 200 sieve of 40, a maximum Plasticity Index of 8, and a minimum R-Value (Resistance-Value) of 40. Such imported