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FML, Inc. STS Project 93589 August 28, 1985 -9- �- 2. Foundations i Foundations or structural fill for the support of foundations may be supported on non -organic naturally -occurring fine to 9 medium sand soils having a relative density equivalent to a Standard Penetra- tion Resistance value (blow count) of at lea st 9-blows per foot. This relative density can be determined using the dynamic cone penetrorster test. For foundations supported on these soils, a maximum allowable soil bearing pressure of 3,000-pounds per square foot may be used for proportioning footing sizes. Foundations' supported on properly placed and densified fill material as recommended in the previous section may also be designed on the basis of a maximum net allowable soil bearing pressure of 3,000-pounds per square foot. The net allowable soil bearing pressure refers to that pressure which .� P may be transmitted to the foundation bearing soil in excess of the pressure due to the final minimum depth of overburden. Ire order to avoid disproportionately small footing sizes, continuous footings should have a minimum width of 20 inches and isolated column footings have a minimum dimension of 3 ft. + We recommend that all exterior wall foundations be supported at a minimum depth of 4 ft below final exterior grade in order to pro- vide adequate protection from frost penetration. ion. Interior footings i,n the unheated garages should have a minimum embedment of about 2 ft to provide confinement to the soils stressed by the foundations. We recommend the shallow footings and surrounding soils be insu- lated to provide some frost protection. Based on the above design, total settlement on the order of 1/2 to 3,/4 inch may be Y expected, with approximately one half of this amount occurring as differential movement. 1 0