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I <br />�t <br />Merila and Associates <br />STS Project 93492 <br />December 19, %9i4 <br />-10- <br />strength of at least 1-ton per square foot can be proportioned f.or a <br />maximum net allowable soil bearing pressure of 2,000-pounds per square <br />foot. The net allowable soil bearing pressure refers to the pressure <br />which may be transmitted to the foundation soil in excess of the <br />pressure due to the final minimum depth of overburden. We recommend <br />that a minimum width of 20 inches be utilized for proportioning strip <br />footings, and a minimum dimension of 30 inches be used for isol?'.ed <br />column footings. Exterior footings and footings in unheated portions <br />of the building should be supported at least 4 ft below final grade to <br />provide adequate protection from frost penetration. Interior footings <br />should be placed a minimum of 2 ft below final grade in order to pro- <br />vide adequate confinement for the foundation bearing soil. <br />We recommend that no foundation concrete be placed in standing water or <br />on soils loosened or softened by construction traffic. Rather, ground <br />water seepage or rainwater accumulation as well as any softened cr <br />frozen soils should be removed prior to foundation placement. We <br />recommend that an experienced STS Technician make an on -site <br />observation immediately prior to the placement of foundations, to <br />determine that soil conditions are as anticipated in this report and <br />suitable for foundation support at that time. Total settlement of the <br />foundations placed as above should be 3/4 to 1 inch with differential <br />settlement on the order of one half (1/2) of this amount. <br />0- <br />