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Junc 15.2007 <br />Mr. David King <br />LR�A Job Nn. GA(17G <br />Pagc 2 <br />To countcr ihc activc pressurc, wc rccommcnd a passive latcrt�l soil pressurc of 375 pcf Eil'D <br />ovcr soldicr pilc loc cmbeJmcnt. 'i'he active soil pressure is to apply on one pilc spacing atbve <br />bottom of excavation and onc pile-diamctcn c�low; while the passivc prcssurc is to appl,y on� the <br />Icsscr of one pile-spucing and 2.5 pile-diumeters. lhe temporary soldier pile shoring N�all should <br />be designed for a factor of safety of at least 1.5 against sliding and overtuming failures. <br />"I he timber lagging bourds may be designcd for onc half of the above recommended active soil <br />pressurc, taking into considcration of thc arching cl%ct of soils. 7'hc lagging boards should bc of <br />trcated wood suitable for outdoor use and should be shimmed to leave a I/4-inch gap betwr.en the <br />bonrds to allow groundwater to seep through. A layer of non-woven filter fabric should be <br />placeJ ugainst ;hc back af thc lagging boarJs bcforc backfilling thc soldicr pilc wall. 1'he filtrr <br />f'abric w�ll uliow waler to tlow through whilc retaining soils in place. VoiJs behind the shoring <br />wull should bc filicJ wilh cic.m f�rcr-draining sand or pcu gravcl and dcnsified tighdy against thc <br />lagging boards. <br />Plcasc cull if yuu ha��c cmy yucstions. <br />rluach.: Plalc I <br />�,'._�, � . <br />O' . --.._ <br />`-I <br />�,.,.;�.6 �,�7; <br />O� ' <br />Yours vcry truh�, <br />LIL R SSOC'lA l'I:S. INC. <br />� .� <br />J. S. (Julian) Liu. Ph.U., V.1:. <br />Consulting Gcotcchnical linginccr <br />LIU & ASSOCIATI,S, INC. <br />