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SEC. 905.4 DEsiGN LOADS & GFNERAL REQUIREMENTS DESIGN L. <br /> 905.4. Design. <br /> necessary, the allowal <br /> a. Footings shall be so designed that the pressure on the sions made in the des <br /> soil per unit of area shall, so far as possible, be uniform under all serious differential se <br /> parts of the building or structure. the structure. <br /> b. The areas of footings shall be in proportion to the full c. Where the bez <br /> dead loads, including the weight of the footings; in no case shall overlie a stratum ha% <br /> the full dead loads plus the live loads reduced in accordance with smaller values shall re- <br /> section 902.8 cause a pressure under the footing exceeding the Computation of the v <br /> soil bearing capacity permitted by section 906. any depth below a fo <br /> T that the load is sprea, <br /> SECTION 906. SOIL BEARING VALUES. the horizontal, <br /> 906.1. Subsurface explorations. <br /> 906.3. Soil tests. <br /> Before issuing a permit for the erection.addition to or alteration a Whenever the <br /> building official may r <br /> of a building or structure,the building official, in the absence of da_a <br /> satisfactory to him, may require the owner to make borings, dig at the expense of the . <br /> test pits, or make tests of a satisfactory character at such locations, to determine the sust: <br /> and carried to such depths as will disclose the character of any be present test made the build. <br /> in person < <br /> materials underlying the site of the proposed building or structure ; apparatus and test pri <br /> which may affect the stability or settlement of the structure. Such I <br /> records shall be certified by a competent engineer or architect. 1 the building official. r <br /> Complete records of the results of all subsurface explorations shall with the building otiici:; <br /> be filed with the building official. b. The proposed <br /> of settlement obtained <br /> 906.2. Presumptive capacity. 60 per cent of the se <br /> ' a. In the absence of satisfactory tests, the bearing value per load. The settlement <br /> square foot of soils shall be deemed to be as follows: inch. If, at the propo <br /> Soft clay, medium .. . ..... .... ..... .......... .... .... 1.5 tons satisfied, the allowable <br /> Medium stiff clay . . . ........................_ ... . . .. . 2.5 tons 906.4. Fill rnateria; <br /> Sand,fine, loose .... .. . .. ..... ......... . ... .... .... ... 2 tons No foundation of <br /> Sand, coarse, loose; compact fine sand; and loose sand- fill material, organic rr <br /> gravel mixture .. . .. .... . . ........ .... ..... ... .. . 3 tons sented to the building <br /> i Gravel,loose;and compact coarse sand .. .............. . 4 tons be adequately supporte, <br /> tSand-gravel mixture, compact . ...... .......... ...... .. 6 tons <br /> Hardpan and exceptionally compacted or partially ce- <br /> - merited gravels or sands .. . .. . . . . . . . ... ... ... . . . . . 10 tons SECTION 907. 1 <br /> Sedimentary rocks such as hard sliales, sandstones, lime- 907.1. Materials. <br /> stones, silt stones, in sound condition .... . . . . .. .. . . 15 tons ! <br /> Foliated rocks such as schist or slate in sound condition . . 40 tons i Foundation walls reinforced masonr}•or <br /> Massive, bed rock, such as granite, diorite, gneiss, trap <br /> � ; <br /> rock, in sound condition .. ... ... .. . ...... . . . .... . .100 tons masonry units are useof the standards specit <br /> b. Where portions of the foundation of an entire building ; this code. <br /> or structure rest directly upon, or are underlain by, medium or <br /> soft clay upon different materials, or where the layers cf such 907.2. Thickness. <br /> softer materials vary greatly in thickness, the magnitude and dis- a. Foundation wa <br /> tribution of the probable settlement shall be investigated, and, if ( ness to resist lateral pi <br /> 128 <br />