711 112TH ST SE 7 ELEVEN Geotech Report 2018-01-02 MF Import

r Subsurface Erploration and Propored 7-Eleven Property Geotechnica( Engineering Rtpon Everetr, WashinRton Proiea and Site Conditiom silty, fine to coarse sand with some asphalt, concrete, p!astic, and small wood debris. The location of EP-3 was shifted slightly during the excavation process to avoid a large piece of buried concrete. An asphalt piece up to 3 feet long was also encountered in EP-3. The upper fill layer extended to depths ranging from about 3�h to 4�h feet in EP-I, EP-2 and EP-3, and 6 to 7 feet deep in EP-4 and EP-5. We understand that this till layer was placed on the site approximately 10 to 12 years ago. The lower layer of fill was in a soft to medium densc condition and was encountered in EP-3, EP-4, and EP-5. As with the upper fill layer, the lower fill material appeared to be thicker in the northern parcel. The lower layer of fill material was encountered from a depth below existing site grade of about 4�/: to 6�h feet in EP-3, 6 to 11 �h feet in EP-4, and from 7 to 9 feet in EP-5. This fill typically consisted of soft, wet to saturated, black, organic silt and sand with some gravel and sticks in EP-3; medium dense, moist to wet, dark brown, silry, fine to coarse sand in EP-4; and medium stiff, wet, dark brown to black, organic silt with some sand, gravel and an 8-inch-diameter log in EP-5. The lower fill probably represented the initial fill event during developmcnt of the local area and roads. Althou@h the upper fill was in a medium dense condition, it contained construction debris and organics and was underlain by potentially compressible organic fill. Due to the potential for this material to consolidate under loading, the fill is unsuitable for foundation support. Topsoif A 6-inch-Uiick layer of topsoil was obscrved underlying the upper fill in EP-1. This matcrial occurred at a depth of about 3�/: fect and likely represents the original ground surface. This material is not suitable for foundation support. Alh�viun� Medium dense, saturated, golden brown, gravelly, fine to coarse sand was encountered underlying the fill in EP-4. Due to the depth of the excavation, this material could only be penetrated approximately 6 inches with the backhue. This material was interpre �d as alluvium deposited by a stream such as North Creek prior to site grading. This material extended beyond the reach of the backhoe. This material may be suitable for support of foundations. Lodgement Ti!! We encuuntered medium dense ro dense, moist to saturated, gray, silty, fine ro coarse sand with variable gra��el underlying the fill in all the explorations, except for EP-4 where it could Mnrd� 19, 200/ ASSOGATED E�RTN SC/ENCES SR/!'qo � A'E(Ki9J.4�f � D n1'PinpiJ-0I - 14:A' }��gp 4 �/H�