4107 OLIVE ST 2018-01-02 MF Import

DAT L. NELSON AND ASSOCIATES, INC. Consulting Engineering Geology July 13, 1990 _ Project No. 9490 Page 7 and stiff silty fine sands and sandy silt, structural fill or crushed rock. An allowable soil bearing pressure of 4000 psf could be used for foundations placed within the dense to very dense and very hard silts and sands, and glacial till. The suggested soil bearing capacities use a factor of safety of 2 and are based on the following conditions: 1. All footings should be founded into the native site soils, structural fill, or crushed rock, as described above. 2. All footing excavations should be prepared such that a dense, nonyielding, uniform soil condition has been established prior to placement of footing concrete. 3. All footings should extend through any existing loose native soil, non-structural fill or modified zones and be placed to bear a minimum of 18 inches below finished adjacent grade. 1. All footings should be sized according to the anticipated wall or column loadings, and the above soil bearing values. Minimum footing widths of 11 and 20 inches are recommended for all continuous and isolated footings, respectively. 5. All footings should be free of ponded water, sloughed soils and water loosened soils prior to placement of footing concrete. We recommend that footing areas be inspected by a geotechnical consultant prior to placement of concrete to verify that bearing roil type and conditions are consistent with the recommendations of this report. Ground settlements due to structural loads should be less than one (1) inch total and one-half (1/2) inch differential over the building area. During periods of wet weather or in saturated soil conditions, special measures may be required to facilitate construction. Interim excavation grading should be sloped to prevent pending. It should be noted that tho on - site surface soils and weathered zone materials are considered highly moisture sensitive, and may tend to deteriorate if worked during rainy weather or in a saturated condition. Delays in construction activity may result from a deteriorated soil condition. If necessary, the use of a covering of crushed rock or pit run gravel over the subgrade soils is recommended to minimize