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North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 14 <br />(surface compaction or dewatering, excavation oversizing, placement procedures and materials used for <br />engineered fill, etc.) and compaction testing of the engineered fill. <br />C.3. Spread Footings <br />Table 10 below contains our recommended parameters for foundation design. <br />Table 10. Recommended Spread Footing Design Parameters <br />Item <br />Description <br />Maximum net allowable bearing pressure <br />3,000 <br />(psf) <br />Minimum factor of safety for bearing capacity failure <br />3.0 <br />Minimum width <br />Strip footing — 24 <br />(inches) <br />Column footing — 36 <br />Minimum embedment below final exterior <br />grade for heated structures <br />42 <br />(inches) <br />Minimum embedment below final exterior grade for <br />unheated structures or for footings not protected from <br />60 <br />freezing temperatures during construction <br />(inches) <br />Total estimated settlement <br />Less than 1 inch <br />(inches) <br />Differential settlement <br />Typically, about 2/3 of total settlement <br />CA Below -Grade Walls <br />Foundation walls or below grade (basement) walls will have lateral loads from the surrounding soils <br />transmitted to them. Designs should also consider the slope of any fill and dead or live loads, including <br />equipment and materials, placed within a horizontal distance behind the walls that is equal to the height <br />of the walls. Our recommended values also assume the wall design provides drainage to prevent water <br />from accumulating behind the walls. The construction documents should clearly identify the material <br />properties of the soil the contractor should use for wall fill. <br />The project documents should indicate if walls need bracing prior to filling and allowable unbalanced fill <br />heights. <br />BRAUN <br />INTERTEC <br />