615 75TH ST SE Geotech Report 2022-10-25

Subsurface Exploration, Geologic Hazard, and Boardwalk Condominium, Building C Geotechnical Engineering Report Everett, Washington Project and Site Conditions 2.0 PROJECT AND SITE DESCRIPTION The project site is located at the northwestern corner of Building C within the Boardwalk Condominium complex located at 615 75"' Street SE in Everett, Washington. The topography around the greater area of the condominium complex slopes down to the north toward the southern shoreline of Beverly Lake at moderate grades. The topography within the immediate area of the study slopes steeply down to the shoreline from the northern edge of Building C where a rockery is located. The rockery is at least 10 feet tall and the top of the rockery is located 5 to 10 feet north of the building foundation at the northwestern corner of the building. The slope and rockery area is vegetated with landscape plantings and blackberry brambles. We observed several cracks in the exterior of the foundation, separation of the slab from the foundation stem wall, and evidence of erosion of the slope below the foundation south of the top of the rockery. We observed corrugated, polyvinyl chloride (PVC) pipe over a portion of the ground surface near the building. Examination of roof downspouts, footing drainage, and other existing subsurface drainage was beyond Associated Earth Sciences, Inc.'s (AESI's) current scope of work. The proposed project will consist of re-supporting settlement-affected areas of the northwestern corner of the building. Site access is restrictive and will limit the types of construction equipment that can be used. We anticipate that work will utilize hand-operated or small pneumatic or hydraulic equipment. 3.0 SUBSURFACE EXPLORATION Our study included drilling one exploration boring with a hand-portable drill rig. The various types of sediments, as well as the depths where characteristics of the sediments changed, are indicated on the exploration log presented in the Appendix. The depths indicated on the log where conditions changed may represent gradational variations between sediment types. If changes occurred between sample intervals in our exploration boring, they were interpreted. Our exploration was approximately located in the field by measuring from known site features shown on the conceptual site plan provided to us. The conclusions and recommendations presented in this report are based on the exploration boring completed for this study. The number, location, and depth of the exploration were completed within site and cost constraints. Because of the nature of exploratory work below ground, extrapolation of subsurface conditions is necessary. It should be noted that differing subsurface conditions may sometimes be present due to the random nature of deposition and the alteration of topography by past grading and/or filling. The nature and extent of any September 12, 2012 ASSOCIATED EARTH SCIENCES, INC. FSM/!d-EE120288A8-ProjectA201202881 EE1 WP page 2