3121 8TH ST AB 2016-01-01 MF Import

June l, 200R Duplex Building L&A 1ob No. bA055 Pagc 10 Application Within building pads and under foundations Roadway/driveway suUgrade I2etaining wall/foundation wall backfili Utility trench back(ill 13UILDING ROUNDATIONS °o of M:iximum Drv I�cnsitv 9�% 95% for top 3 fcct and 9044, bclow 92% 9J`5� for top 4 fcet and �i0%� bclow Conventional footing foundations nmy be used to support the proposed duplex building. Thc footing foundations should bc placed on or into undisturbed, very-dense f�esh till soils, or on structural fill constructed on these competent basal soils. Water should not be allowed to �ccumulate in excavated footing trenchzs. Disturbed soils in footing trenches should be completcly rcmoved or thoroughly re-conipacted prior to pouring concrete Cor thc footings. If the above recommend�tions are followed, our recommended dcsign criteria for footing foundations arc as f'ollo�+�s: • Allowable soil bearing pressure, includi�zg dead ��nd live lo�ids, should not be morc than 3,000 psf for looting; poured on or into very-dense Gesh till soils, �nd not more than 2,500 psf for footings poured on structural fill constructed on these cumpetent basal soils. The footing bearing soils shou!d be verified onsite by a geotechnical engineer after the footing trenches have been excavated and bef'ore the lootings are poured. •; he minimum depth to bottom of perimeter footings below adjacent final estcrior grade should be no less than 1 R inches. The minimum depth to bottom of the interior footings below top of (loor slab should be no Icss than 12 inches. • The minimum width should be no Iess than 16 inches for continuous footings, and no less than 24 inches tor individual foolings, excepi those footings supporiing light-weight decks or porohes. LIU & ASSOrIATES, INC.