2211 GIBSON PL Geotech Report 2023-04-06

August 18, 2014 Gibson Bluff L&A Job No. 14-056 Page 13 Building Foundations Conventional footing foundations may be used to support the proposed residences. The footing foundations should be constructed on or into the underlying undisturbed, medium- dense to dense, Esperance sand soil. Water should not be allowed to accumulate in excavated areas of footing foundations or on-grade slabs. Disturbed and saturated soils in footing trenches or under on-grade slabs should be completely removed down to firm undisturbed Esperance sand soil prior to pouring concrete for the footings and floor slabs. Exposed footing bearing soil should be compacted to a non-yielding state with a vibratory mechanical compactor prior to pouring concrete for footing foundations. If the above recommendations are followed, our recommended design criteria for footing foundations are as follows: • Allowable soil bearing pressure for footing foundations, including dead and live loads, should not exceed 3,000 psf. Footing bearing soil should be verified by a geotechnical engineer prior to pouring concrete for footing foundations. • 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 of floor 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 porches and wood decks. 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 the buildings LIU & ASSOCIATES, INC.