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I )MON 2905-2907 I (d) Expansive Soils.When expansive soils are present,the building official may require that special provisions be made in the foundation design and con- �D ( struction to safeguard against damage due to this expansiveness.He may require a special investigation and report to provide this design and construction criteria. (e)Adjacent Loads.Where footings are placed at varying elevations the effect of adjacent loads shall be included in the foundation design. (f)Drainage.Provisions shall be made for the control and drainage of surface water around buildings.[See also Section 2907(d)6]. n Allowable Foundation and Lateral Pressures J Sec.2906.The allowable foundation and lateral pressures shall not exceed the values set forth in Table No. 29-B unless data to substantiate the use of higher values are submitted.Table No.29-B may be used for design of foundations on rock or nonexpansive soil for Types II One-hour,U-N and V buildings which do not exceed three stories in height or for structures which have continuous footings having a load of less than 2000 pounds per lineal foot and isolated footings with loads of less than 50,000 pounds. Footings Sec.2907.(a)General.Footings and foundations,unless otherwise specifi- cally provided, shall be constructed of masonry, concrete or treated wood in conformance with U.B.C.Standard No.29-3 and in all cases shall extend below the frost line. Footings of concrete and masonry shall be of solid material. Foundations supporting wood shall extend at least 6 inches above the adjacent finish grade.Footings shall have a minimum depth as indicated in Table No.29-A unless another depth is recommended by a foundation investigation. (b)Bearing Walls. Bearing walls shall be supported on masonry or concrete foundations or piles or other approved foundation system which shall be of f" sufficient size to support all loads.Where a design is not provided,the minimum foundation requirements for stud bearing walls shall be as set forth in Table No. 29-A. EXCEPTIONS:1.A one-story wood or metal frame building not used for human occupancy and not over 400 square feet in floor area may be constructed with walls supported on a wood foundation plate when approved by the building official. 2. The support of buildings by posts embedded in earth shall be designed as specified in Section 2907 (g). Wood posts or poles embedded in earth shall be pressure treated with an approved preservative. Steel posts or poles shall be pro- tected as specified in Section 2908(h). (c)Stepped Foundations.Foundations for all buildings where the surface of the ground slopes more than 1 foot in 10 feet shall be level or shall be stepped so that both top and bottom of such foundation are level. (d)Footings on or Adjacent to Slopes. 1.Scope.The placement of buildings and structures on or adjacent to slopes steeper than 3 horizontal to 1 vertical shall be in accordance with this section. 2. Building clearance from ascending slopes. In general, buildings below ` slopes shall be set a sufficient distance from the slope to provide protection from 523 I�