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L <br />i <br />` Proposed McCabe Residence Remodel <br />, Everett, Washington � <br />` Project No. 6(}-9701022 <br />Pege 8 <br />Foundation subg�ades may require protecdon from foot aad equipmmt hatiic and pondieg of <br />nuaffduring wet weatt�er or site condi6oes. Typically, compected cnuhed rock or a lean-mix concrete <br />__ mat placed ova a property prepered subg�ade provides eda�uate subgrade protecdon. Fow�d�tion <br />conerete should be placcd and exeavations becicfilled a� soon as possible W proteet the bea�inQ ande. <br />I ,� ,-,� .,.'-*►'1 <br />If ea�thwork takes place ducing fixring conditions, all expo�ed subgrades should be �llowed w <br />thaw end then be rccompected prior w placing subxquent lifts of structural fill or foundedon <br />componerts. Altematively, the frozen material could be stripped from the subg�ede W reveal unfrozen <br />soil prior to placing subscquent liRs of fill or foundadon componenb. The frozen soil should not be <br />reused as shuchual fill ondl allowed to thaw and adjusoed oo the p�oper moisture content, which mey not <br />be possible during wet weatLer or wld site condidons. <br />�� , � r. i�ill <br />All structucal 511 ahoWd be placxd in a�xoidence with the recortunendations praented herein for <br />swctural fill. Prior to the placement of sWctural fill, all surfaces to receive fill should be prepared u <br />previously rxommended. <br />Struchual fill includes eny fill material placed under footings, pavements, or other pem�anent <br />structures or facilities. The use of on-site aoils for stcuctural 611 is considered acceptable provided the <br />moisture content can be controlled in ordec to achieve the minimum recommended compection levels, <br />although significant effo�t may be required for adequate moisWre condidoning. Materials typically used <br />for import structural fill include clean, well-graded sand and gravel ("pit run'7; clean send; variout <br />mixtures of gravd; ccushed rock; controlled�ensity 611(CDF�; and lean-mix rnncrete. Cntshtd, recycled <br />concrote is also useful for shuctural fill provided the maurisl is thorouRhly crushed W e siae dxmed <br />appropriate by the gmtxhnical engincer (usuelly well graded and less than 2 incha). Structural Rll <br />materials should be free of deleterious, organic, or frozen matter and should contain no chemicals that <br />may result in the materiel being clessified av "contaminated". 'Ihe top 12 inches of compacted stnictutal. <br />fill should have a maximurt► 3-inch perticle diameter and all underlying fill a maximum 6-iuch diameter <br />unless specifically approved by the soils engineer. <br />Import stcuctural fitl for raising site grades should consist of a combination of "common"fill if <br />site and weather conditions permit it. Due to the potential for flow rype slope failures on thie site, it <br />would be beneficial to use lower permeability wmmon fill rather than "select" gtanuler fill, though <br />select fill is much more tolerant of wet weather and site conditions. Common structural fill should <br />consist of predominantly granular soil, free of organics and deleterioos materials, which is compecteble <br />to a firm and unyielding condition at the specifted compaction levels. Common fill is typically more <br />