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�y^r w rZZ <br /> c <br /> `G E"�,C .`� i 7'n r. O•G-+ t.`..O �_r�i p„ ., ry o v ,�«„^ H <br /> • 1 :.i ""(0 Y ,•-• <br /> inn o '� CO � :!rp�� � o o <br /> ` G1� T,� O�,{[�, �.� a a.+ `�^ �•C� to A <br /> <p <br /> ^•�.'r� �^ �'.'1� N H j l~�� to MCD �� T v, �• «Iw N_Z1n h-��1 N <br /> t9 t^D ti 7 '�. n .r7 .�'f9 y►ors <br /> TABLE NO. I8-11—ALLOWABLE SOIL PRESSURE �o <br /> INCREASE IN VALUE FOR <br /> VALUE PERMISSIBLE EACH FOOT OF DEPTH <br /> MINIMUM DEPTH OF IF FOOTING IS AT THAT FOOTING IS BELOW MAXIMUM <br /> 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 i 4 B <br /> Rock 0' 20%of ultimate 0 201/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 /> ro Loose sand 2' S00' 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 1'6' 1000' 50 <br /> Compact inorganic sand and silt mixtures 1' 1000 200 4000 <br /> Loose inorganic sand silt iixtures 2' 500 100 1000 <br /> Loose organic sand and silt mi:titres and <br /> muck or bay mud 0' 0 0 0 <br /> Vnesr v,ilues are for footings one foot (l') 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 /> g.ov x x a 7 <br />