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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Transport Tire, Inc. <br /> <br />-10- <br /> <br />Harch 1,. 1983 <br /> <br />excavation should be thoroughly compacted by a large vibratory <br /> <br />sheepsfoot roller such that it is compacted to at least 95% of <br /> <br />the maximum dry density obtained in accordance with ASTM <br /> <br />Specification D-1557-70, Modified Proctor Hethod. After proper <br />densification of the excavated surface has been accomplished, <br />additional thin lifts of fill material may be placed and <br />compacted. The existing non-organic fill material can be reused <br />for foundation support placed in lifts not exceeding 8 inches in <br />loose thickness and compacted to at least 95% of Modified Proctor <br /> <br />maximum dry density. The oversize of the subcutting should be 2 <br /> <br />ft outward from each edge of the footing. <br /> <br />As in the previous alternative, 'the footings and foundation walls <br /> <br />should be constructed of reinforced cast-in-place concrete. <br /> <br />Foundations designed and properly constructed on the compacted <br /> <br />base material as recommended may experience total settlements on <br /> <br />the order of 1 to 1-1/2 inches, with the differential settlement <br /> <br /> <br />being approximately one half (1/2) of this amount. <br /> <br />In all of our alternative designs and in either of the two approaches, <br /> <br />except for deep foundations, in order to avoid excessively narrow footings, <br /> <br />we recommend that continuous footings have a minimum width of at least 20 <br /> <br />inches and that isolated column footings have a minimum width of 30 inches. <br /> <br />STS Consultants, Ltd. <br />