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PROJECT NUMBER 2184 17 May 1997 page 1 of 4 pages <br />CLIENT <br />REFERENCF <br />SUBJECT <br />Joel Relethford <br />7015 Yew Street <br />Everett, Washington 98203 <br />Yew house located at 7015 Yew �treet, Everett <br />Replacement of failed retaining system <br />INTRODUCTlON <br />The purpose of this report is to <br />present the results of a geotechnical <br />investigation of the failed RR tie crib <br />wall retaining system located at the <br />Relethford residence located at 7015 <br />Yew Streat, Everett, as shown in <br />Figure 1 on the next page, and to <br />present the design of a Keystone wall <br />to replace the failed wall. <br />The investigation and report were <br />authorized on 25 January 1997 by <br />Joel Relethford, owner, during a <br />conversation with Qale C. Hemphill of <br />HFMPHILL CONSULTING ENGINEERS. <br />INVESTIGATION <br />HEMPHILL investigated the site on 25 <br />January 1997 and observed that <br />portions of the existing railroad tie <br />retaining wall had failed. Some of the <br />ties had decayed from brown rot. The <br />wall was not properly designe�� and <br />constructed for the lateral forces from <br />the retained soils. <br />The retaining wall was supporting <br />soils composed of silty fine sand that <br />was loose at the outer surface, but the <br />inner compaction could not be <br />determined. The source of the backfill <br />might have been the natural soils <br />excavated for the house, which wculd <br />be the Esperance Sand, shown in <br />Figure 2, the partial USGS Geologic <br />map on the next page, and indicated <br />by Qva. Qtb is the Lawton Clay <br />observed on nearby properties, and <br />covered by blackberries on this site. <br />� �'�� --�- ����r� <br />