400 SIEVERS-DUECY BLVD 2016-01-01 MF Import

I : � . SFWVNON bWILSON,INC. � ► If adjacent individual footings or slabs are located ac different elevations,it ia rer,ommended that the horizontal distance between them be at least 1.S times the i elavation difference. ► Footing and slab subgrade prepazation shc,uld include clearing all urgani�s and loose, 1 soft,wet,or disturbed soil prior to rsinforced concrote placement. If soft,or unsuitable soil is encountered below the footing level,the sub��ade should be overexcavated to a i suitable bearing soil. The overexcavated poRiott may be backfilled with a compacted granulaz structural fill,controlled density fill,or lean concret�. If struciural fill is W be used, the width of the footing excavation bottom should be eyual to or greater than twice � the overexcavated depth plus the width of the fa�ting. The structural fill should be compacted as recommended in Section 4.1.1. � ► If construction is to take place in wet weather,we recommend that a worldng surface be , prepazed immediately after axcavating footing a�id slab a;eas. This working surface may consist of a thin layer(2 to 3 inches)of lean concrete or at least 6 inches of compacted, � well-graded,clean sand and g�avel(less than 5 percent by dry weight passing the No. 200 sieve based on the'/.-inch minus fraction). Footing and slab excavations should be kept free of water at all times. � ► A representative from our fimi should evaluate each footing or slab area to confian suitable beazing conditions. 'This should t�e accomplished immediately prior to the Iplacement of concrete over the working surface. 4.5.1 Eatlmated Set:lement ! � The magnitude of total and�'.Cferential settlements of spread footing foundations depe�ds on the density and thickness of the Y•,;aring soils and the magnitude of the loading on the Ifootings. Generally, if the footings are constntcted in accordance with our recommendations (footings bearing in the mediutn dense Branulaz fill),we estimate total settlements to be on the iorder of 1 inch or less. Differential settletnent between adjacent footings or within about 20 feet along a slab or continuous wall £ooting are estimated to be about one-balf of the total Isettlements. Due to the granulaz nature of the native soils, settlements aze anticipated to occur essentially as the load is applied. � 4.5.2 Lateral Resistance I I,ateral forces from soil,wind, or seismic loading may be resisted by friction along the base of the footing or slab. We reconunend that a coefficient of friction of 0.4 be used between cast-in-place concrete and the granul_: site soils or stntctural fill. An appropriate factor-of- � safety should be used when calculating the resistance to sliding at the base of a footing. I wee.s-0i.r�u..�,�m W8628-01 I $ � 2