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E3RA <br />��b�,5� a, zoia <br />E i ��aas <br />�1r. [3rian Monahan <br />Flin�lu»�rk E Iomes <br />16400 Southcentcr Parlavay �204 <br />� �,�:,��i�, �va, 9s i ss <br />Re: Lnginccring Desi=n Recommendations <br />Keystone Retaining \Vall <br />123� Donovan Lanc <br />I:verett, �Vashingtou <br />Pemtit # C 140a-01 1 <br />Gcnticm:n: <br />9807. 29'" Ave. W #B102 <br />Everett, WA 98204 <br />425•356-3372 <br />425-356•3374 fa■ <br />IaUG p 4 20t4 <br />, - i�;; <br />i..! +' <br />Ji <br />ci � Y �� E:.v�r��:�•�' _.l <br />Permit Sorvic°� � <br />[n accorcLlnce �vith our a_recment «�ith you, E312r\ is pla�sed to venfy that �ve have �isited the site to <br />review vid evaluate the pmpox�d wall location on the east side of the property. E3ased on our <br />investigation, we understand that the upper 4 feet of the currcnt cut slope is to be �etained following <br />backfilline of the basement ���all as descnbcd in a July 25, 2013 tetter Crom SLGA engineers, who arc <br />thc suuctural engincers for the singlc Camily residencc. <br />Our evaluation of the cut slope indicates dtat the wall will be retaining a slighQy weatl�erecl glacial till <br />soil with a porch from the adiacent residence loa�ted approximatcly 5 feet away. Tlic wall �vill be <br />Counded Uie compactad backfill a�hich �ec undcrstv�d will coasist of the native soils and dnin rock. <br />Rased on this soil profilc a�id the describccl loadine conditions, u�e preparcd a�lculations for a�aviq� <br />(unreinforced) Keysrone modular block wall Cor dtis location. Provided diat Oie backtill in regions r\ <br />v�d B are first completcd, the wall may be constmcted in the plmuted location (see auacl�ed sketch) ui <br />accordance with the typical pnctices of tlic Keystune Conswction M:uu4�l ;uid ihe attached design <br />calcidations. <br />\Ve thank you for �he opportunih� io work �vith }'ou on this project. Ykase contact me din�c:�ly if <br />uuatians should ansc or you requirc additional uilornintion. <br />Sinccrcly yours, <br />1:3RA, Inc. <br />�� � ��� <br />Dcan �I!lVhi e, P.G. <br />Principal ingineer <br />L:rirl: Skercl� of Cross Section at Giticn! Cut (1 sheer) <br />Kc��slone Remining IYnlI Caln�ln�ia�rs (4 sheers) <br />