820 WAVERLY AVE 2018-01-02 MF Import

j \ � H�rris-Ts�ng Architects �2u . December 30, 1988 p�� 4 I � , I Struaural fill is defined as any fill placed under buildings, roadways, slabs and other load supponing areas. Ideally, but particularly during wet weather, structural 511 should comprise � . a free-draining, granular, organic-free material with a maximum siu of three inches. It should contain less than 5 percent 6nes (silt and clay size materials passing th� number 200 mesh sieve). During dry weather, any compa�Kible, non-organic material meeting the above � maximum siu criterion may be used as a structural fill. Structural fill under floor slabs and footings should be placed in thin horizontal lifts not exceeding ten (10) inches in loose thickness. Each lift should be compacted to at least 95 j percent of the maximum dry densiry, as determined by ASTM Test Designation D-1557-78 j (Modified Proctor). Fill under pavemenu and walks should be placed in similar thin lifu � and, with the exception of the upper twelve (120 inches, be compacted to at ;east 90 percent � of the maximum dry densiry. 1'he top twelve (12) inches should be compacted to at least 95 percent of the maximum dry density. The moisture content of the in-place native soils was typically at or above the optimum moisture wntent. When this factor is combined with the relatively high fines content it � makes these materials marginally suitable to unsuitable for use as a structural fill. Therefore, unless tt�e in-place soils can be dried, it may be necessary to import a more granular soil for fill purposes. The soil moisture content can be reduced by seration in dry weather, or by adding lime or cemcnt powder to absorb excess moisture. L:ven if dried, these soils may prove difficult to work or rnmpact during wet weather construction. Foundations Based on the encountered site conditions and the preliminary bu:lding design criteria, we believe that conventional spread footings are the most practical and economical foundation system for the proposed structure. The conventional footings can be designed on the basis of the following criteria: • Allowable bearing pressure = 2000 psf including all dead and livo loads. • Minimum depth of perimeter = 18 inches footing; below lowest adjacent final exterior grade. • Minimum depth of interior = 12 inches footings; below top of floor slab. Earth Con:,ultants, Inc.