4620 SEAHURST AVE 2020-05-20 - Laserfiche WebLink

• March 7, 2011 Mr. Paul Thompson/Kolbear, Inc. L&A Job No. 11-001 Page 10 The ground over which structural fill is to be placed should be prepared in accordance with recommendations in the SITE PREPARATION AND GENERAL GRADING and EXCAVATION AND FILL SLOPES sections of this report. Structural fill should be placed in lifts no more than 10 inches thick in its loose state, with each lift compacted to a minimum percentage of the maximum dry density determined by ASTM D1557 (Modified Proctor Method) as follows: Application %of Maximum Dry Density Within building pads and under foundations 95% Roadway/driveway subgrade 95%for top 3 feet and 90%below Retaining wall backfill 92% Utility trench backfill 95%for top 4 feet and 90%below BUILDING FOUNDATIONS Conventional footing foundations may be used to support the proposed residences. The footing foundations should be constructed at least 6 inches into the underlying, fresh very-dense till and/or dense advance out soil. Water should not be allowed to accumulate in excavated footing trenches. Disturbed soils in footing trenches should be completely removed down to undisturbed,native,fresh till soils prior to pouring concrete for the footings. If the above recommendations are followed, our recommended design criteria for footing foundations are as follows: • The allowable soil bearing pressure for design of footing foundations, including dead and live loads, should be no greater than 3,000 psf if constructed into very-dense, weakly- LIU & ASSOCIATES, INC.