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• . . <br /> ` DAVID L. NELSON AND ASSOCIATES, INC. <br /> Consulting Engineering Geology <br /> J. KEITH CROSS, P.E. JOIN7 VEN7URE <br /> .' Geotechnical Engineering Consultant <br /> 13424 Chain Lake Road Alonroe,Washington 98272 206/754-4332 <br /> may 27. 1983 - - -� <br /> Project No. 2189E ;��•� �i ` i� Lf �� � <br /> �V <br /> ���i'i � ��JJ � <br /> I <br /> The City of Everett � <br /> Public Works Department ...'—.._............. . . ......_ <br /> CIT'f 0� FV"cRc=i� � <br /> 3200 Cedar Street , , ..; ,,. <br /> E\•erett, Washington 98201 - � • - ' <br /> i <br /> ALtention� Dan Mathias. EY�gineering Department I <br /> Referencei Slope Stability Study I <br /> Shore Avenue � <br /> Everett, Washington � <br /> i <br /> Gentlement � <br /> Nie are pleased to aubmit herewith three copiea oS our report j <br /> for the sub�ect project. One set of photographs is submitted ! <br /> with the reporta. This report presents the findings with respect <br /> to a slope etability atudyr as outlined in our proposal dated � <br /> April 8� 15�83 and your notice to proceed dated April 29� 1983• � <br /> The purpose of thie stiudy is to determine information relative ,� <br /> to slope stability, potential instability and mitigating measures � <br /> which could be used to reduce the rate of future sliding and j <br /> ero3ion within the area of Shore Avenue. Four borings were <br /> i <br /> performed along Shore Avenue. <br /> Our study indicated that the slope area north of Shore Avenue <br /> is relatively etable, with areas of local instability. The <br /> unstable areas were found to be predomantly surficial in nature. <br /> The ma�or causes for the observed Pailures appear to be rubbish <br /> and fill placement over the top-of'-slope. changes in geologic i <br /> strata and surface erosion. Geologically, the slope area is ' <br /> underlain by Double Bluff Drift, Whidbey Formation interglacial <br /> depucits and a thin covering of Vashon Glacial deposits. <br />