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r._ <br />C� <br />y:� <br />� �'tl <br />�y <br />9 H Cq <br />H �� <br />� H� <br />"�U M'�tl <br />CA H <br />[�1 O � <br />H <br />OH <br />H�8 <br />%i � cg� <br />��yH <br />N <br />8 �' <br />c� C N <br />� e� r <br />z y v�i <br />H O (n <br />March 20, 1990 <br />Project No. 2890 <br />Paqe 6 <br />DAVID L. N[LSON AND ASSOCIATES, INC. <br />Consulting f_nginecring Gcology <br />. <br />minimum of 2 feet into the dense glacial till along the sloping and downslope <br />portions of the site, and a minimum of 6 inches into the dense glacial till <br />' within the upslope portions of the site. The suqgested soil bearing <br />capacities use a factor of safety of 2.5 and is Uased on the following <br />;n conditions: <br />1, Al1 footinqs should be founded into the native site soils <br />as described above. <br />1� <br />(� ` <br />a ' <br />!� w <br />� � <br />; <br />1A <br />2. All footing excavations should be prepared such that a <br />dense, nonyielding, uniform soil condition has been <br />established prior to placement of footing concrete. <br />3. Al1 footings should extend through any existing loose native <br />soil, non-structural fill or modified zones and be placed <br />to bear a minimum of 18 inches below finished adjacent grade. <br />4. All footings should be sized according to the anticipated <br />wall or column loadings, and the above soil bearing values. <br />Minimum footing widths of 14 and 20 inches are recommended <br />for all continuous and isolated footings, respectively. <br />5. All footings should be free of ponded aater and sloughed or <br />water loosened soils prior to placement oE footing concrete. <br />Ground settlements due to structural loads should be less than one (1) inch <br />total and one-half (1/2) inch differential over the building area. <br />We recommend that footing areas be inspected by the consultant prior to <br />placement of concrete to verify that bearing soil type and conditions are <br />consistent with the recommendations of this report. <br />Durin9 periods of wet weather or in saturated soil conditions, special <br />measures may be required to facilitate construction. Interim excavation <br />grading should be sloped to prevent ponding. It should be noteci that the on- <br />site fill soils, surface soils, weathered zone materials and ba:oal glacial <br />till deposits are considered highly moisture sensitive, and may tend to <br />deteriorate if worked during rainy weather or in a saturated condition. <br />Delays in construction activity may result from a deteriorated :toil condition. <br />If necessary, the use of a covering of crushed rock or pit run yravel over the <br />sub9rade soils to minimize disturbance and softening of the bearing soils <br />N <br />;� <br />,: <br />