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Idaho: : (702)365-9312 I/ Loch s a <br /> Idaho: (208)342-7168 <br /> Colorado: (720)644-9246 engineering <br /> Alberta: (587)774-9040 <br /> 4 May 2018 <br /> City of Everett <br /> 3200 Cedar Street <br /> Everett,Washington 98201 <br /> ATTN: James Bronder,PE <br /> Subject: Broadway Ave.&32nd Street Apartments(Plan Check Number B 1710-41) <br /> Lochsa Number: 154191.00 <br /> Dear Mr.Bronder, <br /> Plan reviews are an important part of the building process and we look forward to resolving the issues brought forth <br /> by the plan reviewer. Please see summary of our responses to the structural comments indicated below: <br /> Note: All revised drawings should be marked with clouds and delta symbol 5 for "Addenda#5",dated 05/04/2018. <br /> Comment#1: It appears that the there is a below grade parking garage being constructed approximately <br /> 15'-0"below grade. On structural details, it appears that the shoring(soil nail wall)is being <br /> designed by another engineer. Please provide a shoring design drawings and calculations to <br /> be submitted for review. Response:APD to provide information requested. WK7 of f , <br /> Comment#2: From the response to the comment, the Engineer of Record determined concrete podium <br /> 1-1 <br /> Ga(t structure to have an extreme torsion horizontal irregularity. Per ASCE 7-10 Sec 12.3.4.2, the <br /> redundancy factor of p=1.3 is required to be applied to earthquake design forces for the <br /> design of lateral force resisting elements. Please revise forces and verify with supporting <br /> design calculations that the elements can withstand the increased demands. <br /> Response: <br /> poi �o c ..kon9 In response to your question regarding the use f p=1.0 r the concrete podium,it is <br /> tvp <br /> -___.� our professional opinion,based on conversations in other structural engineers <br /> 1-�n�be regarding this issue,it is common to ignore torsional irregularity checks for low rise <br /> +Kter,e, anti Wine.buildings when story drifts are very small,i.e.,design story drifts,(using Cd),are less <br /> than 10%of the code drift limit,which our building complies with.I don't think this Ise.," <br /> published anywhere but as we understand this exception has been allowed. <br /> Therefore,it is Lochsa Engineering's opinion that we do not need to design the podium <br /> for p=1.3,and as a result we have not revised the drawings or calculations to indicate <br /> the use of p=1.3. See added sheets B4-B5 for additional information. <br /> a 't7e". TonnCnetI <br /> a f II ��o-F \.� is t c uMt.4 M. s e.rla en*,c,. c A-_ '7 <br /> IV FINKS C5+ ear-tea <br /> l70.O 1 a-4-eta.( 11-&r c t re-A, cs/+fti,s� el i <br /> C I . o 14 e. .e,t# # ac k- p 'n-a 4-"I-R-M-e-0-3Z, <br /> s 1 Ol Ri 4i[, ;} doe, Act r- M- ; dik. can.?tat- <br /> t c- <br /> ire:1wo• 64- -1-t-.., Sc.�v�un a "ti' a_ we.lk <br /> 5 ( . v 3 E ?a.`^- `^OI on a °Ci v1,tt�pnrDtia-�-e cvwov+"E d# <br /> 5 1 ' Lochsa Engineering www.tochsa.com 11-866-606-9784 <br /> S 4.1, <br />