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March 7, 2011 <br />Mr. Paul nompson/Kolbear. Inc. <br />L&.A Job No. I 1 -00 1 <br />Page 10 <br />The eround over which structural fill is to be placed should be prepared in accordance with <br />recommendations in the SITE PRFPARATION AND GFNFRAL GRADING and <br />EXCAVATION AND FILL SLOPES sections of this report. Structural till should be placed in <br />lift- no more than 10 inches thick in its loose state, with each lift compacted to a minimum <br />percentage of the maximum dry density determined by ASI'M D 1557 (Modified Proctor Method) <br />as follows: <br />Application <br />Within building pads and under foundations <br />Roadway/driveway subgrade <br />Retaining wall baclSill <br />Utility trench backfill <br />%ofMaximmm Dry Density <br />95% <br />95% for top 3 feet and 90% below <br />92% <br />95% for top 4 feet and 9016 below <br />BUILDING FOUNDATIONS <br />Conventional footing foundations may be used to support the proposed residences. Ilue footing <br />foundations should be constructed at least 6 inches into the underlying, fresh very -dense till <br />and/or dense advance out soil. Water should not be allowed to accumulate in excavated footing <br />trenches. Disturbed soils in footing trenches should be completely removed down to <br />undisturbed, native, fresh till soils prior to pouring concrete for the footings. <br />If the above recommendations are followed, our recommended design criteria for footing <br />foundations are as follows: <br />• I he allowable soil hearing pressure for design of footing foundations, including dead and <br />live loads, should be no greater than 3.000 psf if constructed into very -dense, weakly- <br />LIU & ASSOCIATES, INC. a <br />