11310 EVERGREEN WAY 2018-01-01 MF Import

• Mr. Bruce Vanderwall _ . . April 16, 2008 We recommend calculating thfs lateral resistance usir�g an equivalent fluid we!ght of �� 350 pounds per cubic foot (pcf). We recommend not including the upper 12 inches of soil in this computadon because they can be afl`ected by wea!her or disturbed by future g�ading activity. This value a�umes the foundations will be constructed neat against competent soil or backfilled with structural BII as described in the Site Prepa�atfon and Grading section. The values recommended indude a safety factnr of 1.5. Settlements � We anacipate that the total settlements of the building on tl�e competent nadve soils or on compacted struduref fill will be less than one-half inch. Long-term differential , settlement is also expected to be less than one-half inch. The majority of the settlements should occur during constructlon. • Slab-on-Grade Floors It is our opinion that the building Floor slab can be supported on either the firm native soils or on new structurel fills placed over ths pre-existing older fills. We andclpate that three to four feet of new fill will be placed to reach the new grade in the southwest comer of the building while the north end may be near slab Subgrade. All final subgrade oreas should be thoroughly cor�pacted and tested. The subgrade shauld be in a stable non•yielding condition prfor to placement of the slab subgrade grdvel. The floors may be supported on the subgrade prepared as recommended in the Site Preparation and Grading sedion. The subgrade can be constructed on tfie old existing subgrade, or on new compacted structural fill materials placed after compact(on of the subgrade. Where moisture is undesirable, we recommend that the subgrade have a clean free-draining base. This base can consist of import pea gravel or other coarse clean washed material having less than two percent fines passing the No. 200 sieve. The clean gravel layer will reduce the potential for upward capillary movement of vapor moisture through the underlying soil and subsequent vapor wetting of the Floor slab. Where moisture by vapor transmission is undesirable, a durable plastic membrane should be placed below the slab above the clean base or capillary break layer. This membrane is commonly covered with one to two inches of clean, moistened sand to protect damage during construction and to aid In curfng of the conaete. Project No. 1235— —' Page No�8�1�)