1303 MADRONA AVE 2016-01-01 MF Import

.. . ( Gcoteclmicai L'nginccring E��aluation 1303 Madrona Ave - King December 2, 2006 RNII Pilc No. 3930G Pngc 10 tl�r suhsurface walls and �vitliin n di�tance equnl to the subsurtece hcight ofthc wull. "I"his would inciude the eiT.�cts of surcnarges such as traflic :oads, floor siab londs, slopes, or other surface loads. Surchnrgc cffects shoidd be considered if approprintc. "t'he I��teral pressures on �vnlls may be resis�ed by friction betwecn thc foundntion and subgrade soi�, snd by passive resistance acting on the below-grade portion of the f�,undalion. Recommendations for friotionul and passive resistance to latcral londs are presented in the Foundntions subseclion of U�is repnrt. A;I wall b^ckfill should be well compacted as oudined in the Struch�rnl Fill subsection of this report. Care should be tnken lo provent the buildup of cxcess laternl soil pr^ssures, due to overcompaction of the wall backfill. 71iis cnn h= accomplished by pincing wnll backfilJ 'tn 8-inch thick loose li(is and compncting it with srnall hnnd-opemted compactors within 1 distnncr, bciiind the �vall equnl to at least one-half thc hcight of the wall. Pennanent drainage systems should be installed for re,aining wnlls and scbsurtacc walls. �Ve recomn�end that thcse drainnge systems consist of nn 18-inch widc zone of clean (less than 3 percent fines), frce- drnining granular matcrial pineed along the back of the wall. Pea gravel is an ncccptable drain matcrial, or drninage composite mny Ue used instcad. We reoommend tha[ we be retained to evaluate the proposed wall dr�in bnckfill mnterini for its suitnbiliry. 'I'Iro granulnr mntcrial should bc placed up the back of thc wall to widiin 1 foot of the ground surface. Tlic top 1 foot shouW bc n laycr of compacted, low penneability suil to limit surCace wfrier infillr.ttion nnd should be scparatcd from thc underlying frec-draining mnterial Uy u laycr oC pinslic sheuting or building pnpcc A rigid perforntcd ur slmtcd PVC dr;�inpipe, having n minimum diamctcr of 4 inches, should bc cmbedded in pcn grnvel or somc other free-draining ntuterial and wrapped in a non-tvov�n filter fabric nt thc bnse of the wnll nlong its cntire Iength. 'I'his drninpipe should discharge into tightlines Icading to an appropriatc collection and disdmrge point. Surfnc: water drains and roof drains should not be connected to �vall or foo[ing drains ��nlil lhere is nl lensl 1 fout elevaiion differonce'oelotv the footing drains. Closm•c If thc recommcndrilions in tliis rcport are implemented, the projcct should not be adversely atfected by thc smhility of the slopes on the sile nor should Qie project afFect the stnbility of the slopes. This report is issued widi the understnnding that it is the responsibility af thc owner or his represema[ive to ensure that the in�ormation and recommendations contained in this report are called to the nttention oF all RMI ASSOC/ATES LLC ;I'd 65i9-6Z9 109E] s�oa�tyo�d �N su9tsaQ dLS�EO LD 60 �PW