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McGEE ENGINEERING <br />3933 Sitka Place <br />Corvaliis, OR 97330 <br />Phone:(541)757-9833 Fax:(541)758-6585 <br />Staton Construction <br />29394-B Airport Road <br />Eugene, 97~~_ <br />June 27, 1997 <br />ATTi~: N1ike Staton/Ron Ricliey <br />RE: Temporary foundation wall shoring - Salem Courthouse Square. <br />Attached is a drawing which shows information on our suggested shoring method for sta- <br />bilizing the foundation walls under the demolished structures. We are recommending that <br />you use the rubble-ballast method shown for shoring the walls. This method has worked <br />well for us in the past, especially where the floor remains in place to address sliding action. <br />T'he passive pressure capability of the ballasted fills is more than adequate to address <br />overturning due to lateral ~ active soil pressures from the soil side of the wall . We rec- <br />ommend allowing for gravity-draining water through holes punched in the walls at inter- <br />vals to reduce of the possibility of developing hydraulic pressure on the wall. <br />This method is friendly to life safety issues, as the vertical grade changes requiring bam- <br />cading and fall protection are eliminated. However, we recommend that some system of <br />fencing or banicading be installed to train pedestrian traffic away from trip hazard at the <br />wall face. <br />If there are questions, please contact us <br />Sinc~rely, <br />~' .' w.~.. /d"~ /~~~ J,~ ` <br />, ~: <br />Dennis M. McGee, P.E. <br />,~ V x/L,v ~ , rU~ r <br />`~j\~~~,iNcF~~~i <br />~~ ~ Z376 '~ <br />~ <br />. ~~,,~`~~ ~,. <br />QR~~QAi <br />2 <br />G ~ <br />C ~,,, ~ '' t a . `Q ~~,~C' <br />c' ~~, ~G <br />'~~~ i~. ~~ <br />~=,r~~;,P f ,' i,Z~3~~ y8 <br />