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April ] 0, 2005 <br />Proposed Singlc-Family Residence <br />L&A JoU No. SA019 <br />Page ll <br />The on-site soils cont�in a high percenlage or fines, and may be used as structural fill only under <br />fair wcather condition when its moisturc content cnn be controlled to close to its optimum <br />moisture conlent. Imported material for structural fill should Ue clean, free-draining, grinular <br />soils containing no more than 5% by weight fin�r th�n ihe No. 200 sieve based on the fraction of <br />the material passing No. 4 sicve, and should h�ve individual particles not larger than four inches. <br />Imported structural fill should be stockpiicd and covered scparately from ihc on-site soils. <br />Structural fill should Ue placed in lif'ts no more than ]0 inches thick in loose state, «�ith eacli lift <br />compacled lo a minitnum percentage of thc maximum dry density detetmincd by Ac7'nq ll1557 <br />(Modificd Yroctor Metl�od) as follo�vs: <br />i���ilication <br />\Vithin building �:.ids <br />Reaciway/drive�vay subgadc <br />Rctaining wall hack(ill <br />Utility irench backlill <br />BUILllING I�OUNllAT10NS <br />"/o of Maximtun Drv Densi� <br />95% <br />95°/a for to�i 2 fcct and 90`;% uclo��� <br />90% <br />95% for top 4 fcet �ncl 90% below <br />Conventional footing foundations may hc used (or supporting the proposcd residcnce. Thc <br />footing foimdations should be placed on or irto thc underlying, densc to very-dense, glacial drift <br />and advance ouhvash 501�5. �O reach tliese competent bearing soils, ihe (ooti��g ircnches ���ill <br />h�vc to bc cacnvatcd to about 3 Ccet clecp in thc uphill area mid to 6 fcct deep in the downhill area <br />of the site. The exposed soils in tl�e footing trenches should Uc compacted to a non-yielding state <br />with .i ��ibratory mechanical compacted and protccted with a]ayer of compacted 2-incli-minus <br />crushecl rock at Icast 6-inch �hick. \V�ter sliould not bc allo�ved to accumulate in exca��ated <br />L1U & ASSOCIAT�S,INC. <br />