500 LAUREL DR 2016-01-01 MF Import

Geotechnical Engineering Study 00-2267 Three Story Addition - 500 Laurel St.eet, Everett January 31, 2001 � Page 27 � slope comprise dense to very dense silty sand to sandy silt soils, and stiff to hard silt or clayey silt soils. Visual Slope Evaluation: Our representative conducted a visual evaluation of the site slope by walking over the as much of t.he exposed surFace as reachable. In addition, we also conducted a relatively close visual evaluation �f tne soils exposed in the near vertical cut along the toe of the slope adjacent to th� railroad � ight-of-way. The prmary purpose ofthis visual e�ialuation was to attempt to find visible evidence of any suficial sioughing, erosion: I damage or deep seated failure. We noted that there ar.� several "older' large diameter trees and tree stumps on the property which exhibited trunks of up to, or more than, two feet in diameter. Some of these trees are also growiny straight and vertical and exhibit vi�tually n� visible svidence of downslope cfeep action: (This is considered to be one piece of evidence that the site s!ope was, and is, stable.) Our visual evaluation did provide sorrse evidence of localized erosional damagt across the upper near vertical bluff slope, and on the lower part of the slope by the railroad. We also observed some evidence that shallow landslide activity has occurred in the recent past on the central and slightly flatter slope area on this, and the adjacent property to the southwest. We did not observe any visible evidence of a deep seated failure, but we understand that a draina�ge induced slope failure did occur several hundred feet to the south on a nearbr property only a couple of years ago. (The geotechnical enginEaring for the repair was apparently carried out by Geoenginee�s of Redmond, Washington an behalf of the C;ity.) Computer Analysis: We also conducted an analysis of the approximate slope configuration based on the available relatively crude topc�raphic data generated on the local topographic quad map of the area. We also developed a series of whatwe believe are reasonably cor�servative soil parametE�s forthe several "majar" strata forming this slope. Based on the encountered subsurface soils, and as generally depicted in the boring log in Appendix A, wE estimate thatthere are about six rnajor soil strata forming and underlying the site slope. For our analysis we assigned these soil the following tabulated parameters: 3