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� <br /> Tlrc Xilc�� Grnup, lnc. <br /> April 5, 2012 <br /> Mr. Mikc Gerodettc <br /> llit•T•Works <br /> 10318 33rd Avenuc Southrnst <br /> E��crctt, WA 98208-4 5 1 2 <br /> Via emaiL gerodctle(n�live com <br /> RE: F,coln},ry f3lock V1'all Recummendelions <br /> 5505 Broadway <br /> Evcrctt, Wast�in�ton <br /> R(:[ Prnjcct No.2011-123 <br /> Dcar`1r.GcrodcUc: <br /> As requested, 'I�he Rilcy Group, ]nc. (RGI) is picascd to providc recommendalions for ihe <br /> roinCorced ccolo�y hlnck wall on the e:ut side of thc lot. RGl h:Lti hecn providing gcot�,chnical <br /> consultation Cor thc sitc grading. <br /> F,XIS7'ING STOCKPILEU SOII.S <br /> Granular soils were imponcd to ihc sitc lasl ycer and stockpiled on sitc for fu�urc usc. The soils <br /> consist otc(can san and are suitable for usc a� structural fill provided the moisture amtent is <br /> ncar optimum conicnt. Thc stockpilc is on thc slnpcd arc of'thc sitc and scvcrc erosion gullics <br /> have de�elopal ovcr thc µintcr. If thc construction of Ihe rclaining wall and placemcnt of thc <br /> stockpiled soils is nul expccted �o occur within the next few weela, we reconunend emsion <br /> control he improved on the site in accordance widi thc following recommendalions. 'Ihese <br /> recommendations will al.so appiy if finish grades are not echieved with the soil srockpiled un <br /> sitc and th� sitc is lo rcmain un-workcd for more than a few�viceks. <br /> A;HOSION AND SEDI�9EN'1'(:ONTROI. <br /> Polcnti,il sources or causes of etosion and sedimentation de�xnd on consiruction <br /> mcihuds, slopc Icngth and gradient, :miount of soil exposcd and/or dislurbed, soil type, <br /> censiruclion scqucncing anJ weathcr. 'I'hc impacts on crosion-prone areas ca�i be <br /> rcduccd by implcmcnting an croxion and scdimentation control plan. 'I'hc plan should bc <br /> dcsigncd in accordancc with applicable city anJ/or county standards. <br /> Wc n•conuncnd lhc tollowing crosion contrul Bcst Managemcnt Practiccs(13MPs): <br /> Y Scheduling site preparation and grading for the drier summcr and eazly fall <br /> months and undcrtaking activities th�t cxpose soil during periods of little or no <br /> ��Rr�i; <br /> Z Rctaining existing vcgctation whcncvcr fcasiblc; <br /> ➢ Bstablishing a yi�arry spall construction cntrance; <br /> 59.NVINC 711k:��AfIF:C iV01177i\Vf:gT <br /> Walcrn Nntbinglai•forpomlc O�ce Enalrm I{'asAing(on 6 Orrgon O/��z <br /> f 9521 BmhrR Moy Nord�ma� 1N335ouih H'ashmgron S�ie�� <br /> RollrrN, N'uahiny/w 58011 Kenm�nck H'aahir�ron 99337 <br /> !'honr l75A73 fi551 �f'ac 475.4)5.03/I Phone 509!86.1800•F¢r 509.38'6.4863 <br /> wvu�n(r�,grm�p,mnr <br />