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Q = A C r.bi p C y rn (�p K W S) (D O �•r-3 S A ,A„. <br /> Jr y.O+ �•p fD rt `h (~D (9 y C'�`c A W �.r, <br /> o y 00-�l Os o n to ? r <br /> w G1. C <br /> O ~ �• p ? cop M 9 (D O( C) <br /> n O Q !LIU — yna O <br /> "_ �� O 9 O toO ( op,� 8�^. IP OD to ^CfOow G Ymc•�• T 's- <br /> bo <br /> CD <br /> �..� �0 n 06 z� <br /> 'CID <br /> O <br /> i <br /> TABLE NO. 28-8—ALLOWABLE SOIL PRESSURE <br /> INCREASE IN VALUE FOR i <br /> VALUE PERMISSIBLE EACH FOOT OF DEPTH <br /> MINIMUM DEPTH OF IF FOOTING IS AT THAT FOOTING IS BELOW MAXIMUM <br /> e CLASS OF MATERIAL FOOTING BELOW MINIMUM DEPTH, MINIMUM DEPTH, VALUE <br /> ADJACENT VIRGIN POUNDS PER POUNDS PER POUNDS PER <br /> GROUND SQUARE FOOT SQUARE FOOT SQUARE FOOT <br /> 1 2 7 4 S <br /> Rock 0' 20010 of ultimate 0 20r/o of ultimate <br /> crushing strength crushing strength <br /> Compact coarse sand 1' 1500' 300` 8000 <br /> Compact fine sand 1' 1000' 200' 8000 <br /> N Loose sand 2' 500r 100, 3000 <br /> Hard clay or sandy clay 1' 4000 800 8000 <br /> Medium-stiff clay or sandy clay 1' 2000' 200 6000 <br /> Soft sandy clay or clay 2' 1000 50 2000 <br /> Adobe 116, 1000' 50 <br /> Compact inorganic sand and silt mixtures 1' 1000 200 4000 <br /> Loose inorganic sand silt mixtures 2' S00 100 1000 <br /> Loose organic sand and silt mixtures and <br /> muck or bay mud 0' 0 0 0 <br /> 'These values are for footings one foot (I') in width and may be increased in direct proportion to the width of the footing to a maximum of <br /> three times the designated value. <br /> °For depths greater than eight feet (8') use values given for clay of comparable consistency. <br /> d <br />