1632 46TH ST SE 2020-06-18 - Laserfiche WebLink

July 3, 2017 Single-Family Residence L&A Job No. 17-079 Page 14 structural fill placed over the advance outwash basal soil The footing bearing soil should be verified by a geotechnical engineer after footing trenches are excavated and before footings pothred. • The minimum depth to bottom of perimeter footings below adjacent final exterior grade should be no less than 18 inches. The minimum depth to bottom of the interior footings below top offloor slab should be no less than 12 inches. • The minimum width should be no less than 18 inches for continuous footings, and no less than 24 inches for individual footings, except those footings supporting light-weight decks or porches. A one-third increase in the above recommended allowable soil bearing pressure may be used when considering short-term, transitory, wind or seismic loads. For footing foundations designed and constructed per recommendations above, we estimate that the maximum total post-construction settlement of the buildings would be 1/2 inch or less and the differential settlement across building width 3/8 inch or less. Lateral loads on the proposed building may be resisted by the friction force between the foundations and the subgrade soils or the passive earth pressure acting on the below-grade pa/ton 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 pcf(pounds per cubic foot) for the passive earth pressure be used for lateral resistance. The above passive pressure assumes that the backfill is level or inclines upward away from the foundations for a horizontal distance at least twice the depth of the foundations below the final grade. A coefficient of friction of 0.55 between the foundations and the subgrade soils may be LIU & ASSOCIATES, INC.