5107 SOUND AVE 2017-01-14 - Laserfiche WebLink

July 21, 2014 Two Single-li amily residences I,&t� Job No. 14-065 Page 17 bearing soils should be verified by a geotechnical engineer after the footing trenches are excavated and before the footings poured. • The minimu�n depth to bottom of perimeter footings below adjacent fmal exterior grade should be no less than 18 inches. The rninimwn depth to bottom of the interior footings belov�T top of floor slab should be no less than 12 inches. • The minimum width should be no less than 16 inches for continuous footings, and no le�s t�an 24 inches for individual footings, except those footings supporting light-weight decks or porches. ,., ;,�g : ��,�,,, r��;�-,,,r,��,�Q� a�1n��hle soil bearing pressure may be - ,; , 1'�,. o�A� � _�� :;��. _ used when considering short-term, iransi�ory, wii�d or sei��ni�; ��aac�s. �� r �'��n5 foundations designed and constructed per recommendations above, we estimate that the naa�mum total post-construction settlement of the buildings should be 3/4 inch or less and the diffc,rential settlement across building width should be 1/2 inch or less. Lateral loads on proposed buildings rnay be resisted by the friction force betweem the foundations and the subgrade soils or the passive earth pressure acting on the belaw-grade portion of the foundations. For the latter, the foundations must be poured "neat" against undisturbed soils or backfilled with a clean, free-draining, compacted structural fill. We recommend that an equivalent fluid density (EFD) of 275 pef (pounds per cubic foot) for the passive earth pressure be used for lateral resistance. Th� above passive pressure assumes that the backfill is level or inclines upward away frorn the foundations for a horizontai distance at least 1.5 times the depth of the foundations below the final grade. A coefficient of friction of 0.5� between the foundations and the subgrade soils may be LIU & ASSOCIATES, INC.