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Geotechnical Engineering -__;::)rt Irerracon <br /> SN4924 —Silver Lake North Cell Tower Everett, Washington <br /> October 24, 2014 Terracon Project No. 81145043 <br /> 2.2 Site Location and Description <br /> Item Description <br /> The proposed tower is located at 1810 104TH ST SE in Everett, <br /> Location Washington. The proposed tower coordinates are Latitude N <br /> 47.9032360 and Longitude W 122.2079250. <br /> Existing improvements The future lease portion of the site is partially developed with a <br /> chain link fence and a paved section. <br /> Current ground cover Current ground cover is partially gravel and partially paved asphalt. <br /> Based on the Existing Site Survey provided by the client, USGS <br /> Existing topography contour maps, and field observations, the proposed lease site is <br /> flat. <br /> 3.0 SUBSURFACE CONDITIONS <br /> 3.1 Site Geology <br /> According to the USGS Geologic map of the Everett 7.5 minute quadrangle (Minard 1985), the <br /> geology underlying the site is mapped as Qvt - Till, "These deposits mantle hills, ridges and <br /> slopes. The till (referred to locally as the Vashon till) is a nonsorted mixture of mud, sand, <br /> pebbles, cobbles and boulders (diamicton)." Subsurface conditions encountered in our boring <br /> are consistent with these glacial deposits. <br /> 3.2 Typical Profile <br /> Based on the results of the boring, subsurface conditions on the project site can be generalized <br /> as follows: <br /> Stratum <br /> Approximate Depth to Material Description Consistency/ <br /> Bottom of Stratum (feet) Density <br /> 1 5 Silty Sand (Weathered Glacial Till) Medium Dense <br /> 2 Full depth of exploration Silty Sand with gravel (Glacial Till) Dense to Very <br /> Dense <br /> Conditions encountered at the boring location are indicated on the boring log in Appendix A. <br /> Stratification boundaries on the boring log represent the approximate location of changes in soil <br /> types; in-situ, the transition between materials may be gradual. <br /> 3.3 Groundwater <br /> Groundwater was encountered about 15 feet below ground surface at the time of drilling. <br /> Although not observed at this site, a perched groundwater table typically develops at the contact <br /> between weathered and unweathered glacial till. It should be recognized that fluctuations of the <br /> 2 <br />