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f � � <br /> ( November 10, 2000 G_1266 <br /> Gillette Residence Page 6 <br /> -Coefficient of Friction(Friction Factor) <br /> I • 035 for wmpacted structural fill <br /> • 0.35 for native dense soil <br /> IWe recommend that footing drains be placed around all perimeter footings. More speci6c details <br /> of perimeter foundation drains are provided below in Section S.i: Dnieage Con�iderationt. <br /> S.S Slab-on-Gnde Flooro <br /> IExcavations for the floor slsb subgrade should be performed carefully in order not to loosen the <br /> I dense native soils. In preparing the Floor slab subgrade, any areas of the building pad disturbed by <br /> construction activity should be either re-wmpacted or excavated and replaced with compacted <br /> st►uctural fill material. <br /> The existing site soils appear to be well drained, therefore, if lhey are fra of contamination no <br /> capillary break is anticipated. However, if silty soils are encountered below the planned floor <br /> ' stab, the tloor slab should be placed on a capillary break, which is in tum placed on the prepared <br /> subgade. The capillary break should consist of a minimum four inch thick laya of frce-draining <br /> crushed rock or gravel containing no more than five percent finer than No. 4 sieve. A vapor <br /> barrier, such as a 6-mil plastic membrane, is recommended to be placed over the capillary break <br /> ibeneath the slab to reduce water vapor transmission through the slab. Two to four inches of sand <br /> may be placed over the barrier membrane for protection during construction. <br /> I5.6 Underpinning ot E:isting Rrick B�aement Wall <br /> IAlthough we did not observe any damage to the existing brick basement wall, this wall is <br /> unreinforced and does not have a proper footing. A new basement wall will be built out side of <br /> Ithe brick wall and we recommend that the new basement wall be use to underpin the outside edge <br /> of the brick wall and the floor slab should be used to underpin the inside edge of the brick wall as <br /> Ishown on Plate 2 - Basement Wall and Slab Section. <br /> The brick wall could also be underpinned with an extension of the re.aining wall footing under the <br /> Ibrick wall at 4 foot interva:s. <br /> IGeo Group Northweat, Inc. <br /> ���� <br /> � <br />