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�� STO I�I� Stork Twin City Testing Corporation Materials Technology Proposed Addition at Residence 965 Edgewood Hills Road Page 7 of 9 Orono, Minnesota Stork Twin City Testing Corporation Project #3106831 4.3 Foundations It appears feasible to support the proposed residential home addition on conventional spread footings, after completion of the earthwork procedures as outlined in section 4.2. The building footings should bear on the native competent soils or on the engineered fill. We recommend that the home addition footings be designed for a maximum net allowable soil bearing pressure of up to 1500 pounds per square foot (psf). A factor of safety of at least 3.0 against foundation shear failure was considered in this recommended design bearing pressure. All perimeter foundations in heated building space should be placed at a minimum depth of 42 inches below exterior grades for frost protection. Interior footings may be placed at any convenient depth below the floor slab. In unheated areas where deeper frost penetration may occur, we recommend that the foundations have a minimum soil cover of 60 inches for frost protection. Based on the above recommendations, we estimate total settlements of the building foundations of less than 1 inch, and the differential settlements of 1/2 inch or less. 4.4 Floor Slabs Site preparation should include removing surface vegetation and subcutting existing fill as needed to allow for placement of a 1' sand section beneath the floor slab. The existing fill should be surface compacted prior to placement of the sand section. Particular attention should be paid to properly compacting the fill against the foundations and within the utility trench backfill beneath the floor slab. Inadequate compaction at these locations may cause cracking of the slab from subsidence of the fill. The floor slabs may be designed to be structurally independent of the building foundations or walls. This agreement shall be governed exclusively by the general terms and conditions of sale and performance of testing services by Stork Twin City Testing,Inc.a North Carolina business corporation("TCT")dd.02/04/2001. In no event shall Stork Twin City Testing,Inc.be liable for any consequential,special or indirect loss or any damages above the cost of the work. Payment is due within 30 days of invoice.