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r�ihussaini Propert}� — tJpc�atecl Reeonuiiez�ciations NGA File No. �67b12 <br />tJltra I31ock Reiziforced Soil t4�ai1 February 14, 2013 <br />Everett, �'ashii�gtc�r I'age 3 <br />,�I1 ii11 placec� far the rein%rced soil wail sho�ild be placed �ts stn�c�tural fill. Structural fili for this project <br />should consist c�f �ranular materiais nc7 �reater• than three inchcs in sire. The moisture c��itent ot the soiis <br />tc� be cozn�acted sl�ic�utd be witllin aboui two percea�t ot� optif�lum so that a readily cc�mgacta6le c,t�ndition <br />exists. All fill �laced in the tivall area should bc: compacted ta 95 percent of the Maximum Ury Density as <br />deternzii�ed by AS1'M ll-1557 (Modified Prc�ett�r). The soil stiould be placed in r�;latively unifon�n <br />hc���i�oa�tal lifts u�� to ei�ht i��ches in t��iel:ness_ T17� lift thickness sl�oulci not e�ceed the manuf'acturet's <br />reeommendaCions for thz compactive device used for this �roject. Sorne of the on-site soils may be suitable <br />for use� as structu�ral fi11 providirig t23e water content of Ti�e material is �uithin two ��rcent of� optimum at tlle <br />tiai�� of fill placeme�it. V✓et sails fo�uzid at the site tivill likely be cizfficulr if n�t zr��possible to oompact in its <br />cUrr�n�t condition. <br />Site Dra�nage <br />We reco�zilenc3 that a new cut-aff trench be iT�stalleci alon� the toe of tiie �pper sla�� above the pa•�pas�d <br />�•etaining �v�ll. 'The cut-off drair� sl�o�rlcl be. locaied in the approYimate Iocation show�� oz� the Schematic <br />Site Pl�n zn i'i�ure i and should ��e stoped to drain intn tl�e lower eat�h basin shown oi� tli� site plan. We <br />have provided a�ietail o� this cut-off irench ir_ Fi�ure 3. A 4-znch ri�id perforated �'VC pipe sho��ld be <br />placed at� the bot�toln of this trench. We also z-ecommend that the residence roof ar�d footing drains be <br />tightlinecl to a separate 4-incl� dianaeter solid P�fC pipe locatec� within tt�is trench. 'I'h� p�ipe stioutd be <br />directEcl tc� discl�ar�e outo a rock spall c�issipaCer pad locatecl at the toe of th� sIope. NGA should be <br />retained ta verify the installation of the cut-off trench and drainage tightlines to assure tliey are installed <br />correctly, a�id to provide recomn�endations as rleeded di�rin� evnstruc�tion. <br />Site Drainage <br />We recor�mend that �SGA be retai�ied to observe the �valI constr-uction and evaluate co�nditions ez�counter�d <br />in the ��etcl witl� respect to anticipate;d cot�ditions. �,'e shoulc� also be retained �o pz-ovide r�comn�endations <br />far ciesign changes sl�ould the, cc�nciilions differ fra�n azztici��ated, and to e��aluaie wt�eth�r ea�lhwar�. <br />acti�°ities com��ly with contract plans anci specifications. All c�ther reeomm.endatic�ns pro�rided in our <br />previous letter should be st�rictly faliow�d. � <br />We trust ttiis memorandusr� should satisfy yaur needs at th�is tiine. 1'lease contact us if you have any <br />questions csr r�c�tiire cidditianal serv�ices. <br />IVELSOPd �EOTECNNICAL ASS�ClATES, IIVC. � <br />i� <br />� <br />