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lune 3. ?Ol I <br /> \4r. Chri, lohn�on <br /> LfiA 1oL Vo. I 1-0�G <br /> Vase �1 <br /> REC011hiF\DATIO\S <br /> General <br /> .�lthou�_h rock��� ��alls r.m pro�ide ;ome degrze of rcteniion c�p�bilih. their main <br /> function is to sci�'e as a protecti�e f�cim� tu ret�rd ��'eatherinc and erosion process tu the <br /> earth bank; hehind thc rocken� ��alls. Earth banks ezca�ated into the Vashon till and or <br /> ad��ancc uut��'ash suils undcrl��ina the subjrct propem� should b: ahle tu maintain lum�- <br /> tcrm stabilit�� if ihe�' are lined b� a properl� consuvcud rocke��'. Our design of ihe <br /> rocken ��;�Il is ;ho��n on the t.pical section sho��n on P►atz '_. <br /> ROCKERl' RECONSTRL CT10� <br /> Gcuernl <br /> :\Ithuugh rocken' ��'alls ca❑ pru�'ide ;om� degrez ut retention capabilin. their m;iin <br /> timction i� w sene �s a protecti�e lacing to retard ��zatherim� and erosion process to the <br /> earth banks bzhind thc rocken "alls. To achiece a satisfacton rocken' ��'all. the e�r.h <br /> hank behind the rocken' ��a�1 must be stable b�' itselt� un a lon�-tenn basis. h� addition. <br /> the rockeil' must be constructed in a proper ��a} to kecp the eanh bank remaining stable <br /> on a lung-tcnn b�sis. The carth bank hehind the ezisting rocken� is cut into older sand <br /> ;oils ot modera�el? hiel� to high shear strength and ��ill be able to maintain lun�-term <br /> ;tabili��� if lincd b�� a propenc �onstructed rocken per rzcununendations ptesented in this <br /> report. Our d�si�sn of the reconstruction uf the failin� rucken' is sho��'n un Plate '_ <br /> uttached hereta Construction of the rocken' ��'��1 s�i��uld be monitored b�� a geotedmical <br /> en�sin�cr durin�� construction. <br /> LIU & ASSOCIATES, INC. ��� <br /> % ' I � !� <br /> ' ' r <br /> , <br />