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[ <br /> � <br /> I�.�isiing fill lucatrd h��lo�� th�� In:il,iinp� r�h��uld hc r��alu:tlr�l �wiup� consuurGun. lLc yu:miit�� ;m�l esicut <br /> i of thc lill is nol I:uu��.n. I�ill ,Loul�l bc r�prqrd ��nhiu thr ;iic;i ol Ihc ptc��ioi�:.lc dcmoli.hcil bo�clin,. <br /> � tillay and Undcr porYiuns of ihc icccnllc ionsuucicd p;u4;in� IoL It m:ro hc pnssihlc Io rcconq�uct Ihr <br /> czisling lill providcd i� c,w hc iucJ a� su-uc�urel lill. <br /> S Subgrnde Preparation <br /> i <br /> Prior lo placing new fill�. p;rvcmcni h;i<c rnursc m;itcrials or gr:ivcl brJoo on-gradc Ooor slah�, wbciadc <br /> 1 :ncas should bc proof rulicd �o locatc any sofl or pumping soils. I'rior io prouf rolling. ull unsuiiable soils <br /> � should be removed liom below buildin� �ireas. Proof rolling ccw be completed using a piece ol'heae}' <br /> �iro-mowitcd equipment such as a loadcd dump Inick. During wet wcather, the exposed subgrade arcas <br /> should bc prubcd lo dc�cuninc Um cxtenl of soft soils. If sotl or pumping soils are obscrved, they should <br /> i bc rcmovcd and replaced a ith s�ructural fill. <br /> 1 <br /> We recommend Ihat building concrete s1ab5-on•grade be supported un at Icas[ I8 inches of swctural fill. <br /> � consis�ing of G inches of enpillaiy hreak gravel and 12 inches of imponed gnvel borrow. Pavemem areas <br /> slwuld bc supponcd on nt Icast IZ inches of importcd slnicWnl fill undcr thc cnishcd rock basc coursc. <br /> Itceommcndations for subgndc prepar,ition undcr building 1'oundalions including ovctcxcavation ol <br /> silt/clay soils is provided in �he Toundation suppon section of this report. <br /> 1 If dcep pockets of soft or pumping soils arc encoun�cred bclow ur oulsidc thc building area, it muy 6c <br /> possible to limit Ihe deplh of overe�cavation by placing a non-woven gcotestile fabric such as <br /> I hlirafi SOOX (or similur ivaierial) on the overexcavated subgrade prior to placing sttuctural fill. 'llic <br /> gcolcxlile will providc nJdilional suppo�l by hridging ovcr thc soft ma�crial and will hclp reducc fiucs <br /> coutaminnlion inW thc stnictur.d fill. 'I'his nmy bc perfonncd undcr pavcment �nd building 11oor slab <br /> � arcas dcpending on actual conditions obscrvcd during cons�niction. Uut it should not occur w�dcr fuiur <br /> building faundatiuns. <br /> Aticr complcting thc prool'rolling, thc subgradc arcas should bc rccompacted �o a fim� and unyiclding <br /> I candilion, i(' possible. 'll�e achicvahle degrec of compaction ���ill depend on when construclion is <br /> perlomicd. If thc a-ork is perfonned during dry wcathcr conditions, wc rccommcnd thal all subgradc <br /> ;�reas be recompacted tu a� Ieast 95 perceni of the tnaximwn dry densiry (MUll) in accordance wi�h the il <br /> I Amcrirm Socicry Ibr l isling and Materiais (AS7'M) ll 1557 tcst proccdurc (modificd Proctor). If thc <br /> �vark is pedonned during we� wenlher conditions, it may uot be possible to recompact the subgrade to <br /> 95 percent ol' Ihc �1UU. hi this case, u•c recmnmend that the suhgraJe be compacted to the extcm I <br /> possiblc wi�hout cnusing undac wcaving or pumping of thc subgradc soils. <br /> I Subgiadc disturbance or dctcrioration could occur if thc subgradc is �vct and cannot be dricd. II'thc II <br /> subginde deteriuraies during proof rolling or cumpaciion, it may become necessap� to nmdify the proof <br /> Irolling or cotnpaction criicri;�or mcihods. <br /> Structural Fill <br /> I �\II fill. �vhcthcr nu-sitc �a importcd soil, supponing Ilour slabs, �+;rvcntcnt .ncas, foundaliuns, or placcd <br /> � against retaining �valls ur in utility trenches should mect the crileria f'or structural fill presented bclow. � <br /> l hc suiiabiliip uf soil fur usc aa suuclur:J lill Jepcuds on ils gradaiion�md moisturc coutcnt. <br /> I DISICCI:IIS. �'I7ll`�I�Iti USC(I �O CUI15(fUCI lI1C building pad and surfacz parkiug .ncas unJ �u Uuckfiti Wilii�� <br /> venches are classi(icd as stnictural fill for Ihe purpose of Ihis repon. Slnictural filt muerial quality varics <br /> dcpcndinE upun ils usc ns dcscribcd bcJu��.. <br /> I I <br /> � F7k��., ��era.uu-.a�� ���—�—_____ __ <br /> 1uh�1'.:n�!� GEOENGINEEp� <br /> � 5G <br /> L � <br />