Laserfiche WebLink
PROJECT NUMBER 2184 17 May 1997 <br />page 4 of 4 pages <br />HEMPHILL recommends that all wail <br />heights be tied back with the Huesker <br />Geogrid with lengths equal to the wali <br />height et the geogrid location plus 3 <br />feet, as shown in Figure 5 on the <br />opposite page. The geogrid should be <br />located at each 2 foot vertical <br />increment. The lowest geogrid can be <br />at any height that is convenient to <br />match adjacent wall sections that <br />might begin at a c!ifferent elevation. <br />An interceptor impervious drain <br />shoufd bz placed behind the wall to <br />intercept runoff'rom the yard surtace. <br />The drain can be formed concrete, a <br />Dale C. Hemphill P.E. <br />� � � <br />Registered Engineer No. 14777 <br />State of Washington <br />half pipe, or other impervious material <br />approved by HEMPHILL. <br />A perforated pipP can be placed <br />within the crushe�� rock at the base of <br />the wall to intercept water that <br />percolates �.icwn through the keystone <br />blocks. <br />Both drains should be condu�ted to <br />the base of the slope by a solid <br />smooth pipe that is anchored to the <br />slope. Final drainage decisions <br />sliould be made by HEMPHILL at the <br />time of construction after all the <br />drainage conditions are revealed. <br />I�E�_,IR,2 P��'Irin''�� <br />