3606 W MUKILTEO BLVD 2016-01-01 MF Import

Gcotechnicnl Lnginecring �valuation Mukiltco Boulevard Devclopment Evcrep, Washington March 31, 2003 NGA Pilc No. 366503 Pagc 10 moisture may also be necessary. We espect th.0 cotnpaction of the native soils to sht�ctural fill specifications would bc cxtrcmcly difficult, iPnot impossible, during wet weather. Fill Placement: Pollowing subgrade preparation, placcment of the structural fill may proceed. All b�ckfilling should be accomplished in uniform litis up to 10 inches thick, dcpending on the size of the compaction cquipmcnt. Each lifl should be spread cvenly and be thuroughly compacted prior ro placemcnt of subscqucnt lifis. All stnictural fill underlying building arens, and within 2 feet of pavement subgrade, sliould be compacted to a minimum af 95 percent of its maximum dry density. Maximum dry densiry, in this report, rcfers to lhat dcnsity as detennincd by the ASTM D-1557 Compaction Tcst procedure. Fills more than 2 fcet bencatli sidcwalks and pa��emcnt subgradcs should be compacted ro at Icast 90 percent of thcir maximum dry density. Thc moisture content of the soils to be compacted should he within about 2 percent of optimum so that a rcadily-compactable condition exists. It may be necessary to overexcnvate and remo��e wet soils in cases whcrc drying to a compactablc condition is not fcasiblc. All compnction should bc accomplishcd by cquipment of a typc and sire sufficicnt to attain thc dcsired degrcc of compac[ion. Foundations Comentionnl shallow sprcad foundations should bc placcd on undiswrbcd mcdium dcnsc or bMtcr nativc soils or be supportcd on stn�ctural (ill, rock spalls, or concrctc extending to thosc soils. Where Icss-dcnsc soils arc cncountcred at footing 6enring clevations, Ihc subgnde should bc ovcrexcavated to exposc suitable bearing soil. "I'he overe�cavatiom m�y bc filled with stnictural fill, rock spalls, or the footing may bc c�tcndcd to thc bcaring nati��c soils. If footings nre supportcd on structural fill or rock spalls, the fill zone shotdd extend outside both edges of the footing a distance equal to one-half of the depth of ovcrc�cavation bclow thc finishcd subgradc. Both perimctcr and intcrior footings shoulJ c�tcnd nt Icast 18 inchcs hclo�e thc lo��cst adjacent finishcd ground surfncc for frost protection and bcaring capaciry considcrations. Minimum foundation widths of 1G ancl 24 inchcs should be used for continuous nnd isolnted spread footings, respectivcly for footings supporting hvo storics or Icss. Por faotings suppoAing thrcc stories, minimum foundation widths of 18 ancl 2�1 inches should be used for continuous and isolated footings, respectively. Standing water should NELSON GEOTECHNICAL ASSOCIATES, INC.