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C C <br />EN NIG EERING <br />Design Clarification M�mo <br />Nelson Residence <br />Project No. 07221.10 <br />DCM No. 1 <br />To: Clark Nelson, Owner <br />From: Greg A Guillen, PE, SE <br />Date: November 18'", 2008 <br />gc���o-��� <br />During construction on ihe Nelson Residence located at 8522 9"' Ave SE in Everett, Washington, the <br />contractor has informed us ihat he cannot obtain Brm undisturbed earih where tha grade bearn is to <br />be installed as originatly cal!ed out in our shvctural drawings without excava6ng an adddonal several <br />feet. <br />Since excavaling ihese additional feet may significantty incxeasa labor cost, we would Gke to <br />recomme�d the allomative option as follows. We wiil inaease fhe grade beam depth from 8' to 17 <br />and put (3) N4 bars in both lhe top and bottom of the grade beam. This wiil stiffen the grade beam <br />significan0y so that it has ihe ability to spread load from the columns above more effedively and <br />span between unstable soils below. This will slighUy irxxease material and labor fees for a larc,�er <br />gradQ beam and more reinforang, but will be oonsidarably les� than the extensive excavating to <br />achieve firm soil as required in the original design. <br />Please be aware lhat this altemative option will not eliminate grade beam failure due to turther soil <br />seUlement in the future and does not equate to the orginal desigci requirement of excavatiny to firtn, <br />undistu?.red soil. However we believe ft to be an acceptable aNemate given the circumstances. <br />Please wntact CG Engineering on how you wish io proceed. <br />250 4" Ave. South, SWtq 200, Edmonds, WA 88020 Officc 425.778.&500 Fa�c 425.77P.5538 � <br />I� <br />