2522 RUCKER AVE 2018-01-01 MF Import

IGeotecluiical Enginaring Report � Gardener Group Condominiums I July 16, 1997 • NCA File No.209297 Page 4 I � The residence located at 2518 Rucker Avenue, to the north of the project site, will be located I approximately 6.5 feet away from the proposed building. The top of the footing was exposed at the west end of the residence. The foundation was found to consist of a footing 1 to 2 inc6es wider than the stem wall. The stem wall consisted of concrete blocks mortared together, and showed signs of distress and I settlement. The foundation for thi: residence was observed to be founded on loose soils, consisting of e dark brown silty fine sand. The bottom of the footing elevation is at about 106 feet. This is Iapprorimately 8 feet abave the planned foundation subgrade elevation for the project. I Geology Most of the Puget Sound region was affected by past intrusion of continental glaciation. The last period I of glaciation, the Vashon Stade, ended approximately 10,000 to 11,000 years ago. Many of the geographic features seen todtiy ere a result of scouring and overriding by glacial ice. During the Vashon I Stade,ihe Puget Sound region was overridden by over 3,000 feet of ice. Soil layers overridden by the ice sheet were compacted to a much greater extent than those that were not. A typical glacial sequence includes till or drift mantling advance outwesh. I . ' The geologic units mapped for this erea are shown on the Geolo¢ic Man of the Everett 7.5 - Minute I Ouadran¢le. Snohomish Counri. Washington by J.P. Minard, 1985. The site is mapped as being underlain by Vashon Till (Qvt). Glacial !ill is an unsorted mixture of sand, silt and gravel that is ( deposited at the bottom of the glacier. Our cxplorations encountered fill and glacial till. ExplomHons I Subsurface conditions were explored on May 20, 1997 with four borings drilled, using a subcontracted L hollow stem auger drill rig. The depths of the borings varied from 133 to 24.0 feet. Satnples were Icollecred during drilling at selected intervals beginning at 2.5 feet below grade, using the Stardard `- Penetration Test (SP"[). The SPT consists of driving a 2.0 inch outside diameter sampler with a 140 � pound hammer falling 30 inches. A geologist representing our f rtn,was present during the explorations. The locations of the explorations are presented on the Site Plan in Figure 2. Soil samples were obtained at specific intervals and logs of the explorations were maintained. The samples K�ere brought back to our ( laboratory for additional examination. The soils wera visually classified in general accordance with the Unified Soil Classification System, a copy of which is presented as Figure 3. The logs of the I explorations ure presented in Figures 4 through 7. I l � ( i ( NELSON-COUVRETTE&ASSOGATES, INC �