2939 COLBY AVE EVERETT MUSEUM 2023-09-26

1braZa1Z & ASSOCIATES GEOTECHNICAL ENGINEERING • ENVIRONMENTAL ENGINEERING CONSTRUCTION TESTING & INSPECTION FORENSIC INVESTIGATION FIELD REPORT Report No.: 09618523DFR111918-NG Date: November 19,2018 Contractor: Newland Construction Project No.: 096-18523 Permit No.: B1807-010 Project: Everett Museum of History Inspector: Niccolo Guiao Project Location: 2939 Colby Ave Jurisdiction: City of Everett Krazan PM: JM Weather: Indoors Temp: 50's F A Krazan geotechnical representative visited the project site today to perform a limited geotechnical investigation. Geologic Map We referred to the "Geologic Map of the Everett 7.5-Minute Quadrangle, Snohomish County, Washington", prepared by James P. Minard (1985). The geologic map indicates that the site vicinity is underlain by Quaternary Vachon glacial till (Qvt). Glacial till generally consists of a very compact, unsorted mixture of clay, silt, sand,gravel, cobbles and boulders. Project Description Project plans provided by CG Engineering, titled "Everett Museum of History", dated 7/03/18 indicate an assumed allowable soil bearing pressure of 2,000 psf(pounds per square foot).There will be a new elevator pit footing in the northeastern portion of the project site for the planned service elevator between grids A.5-A.9/ 2.8-2.9. Footing Subgrade Evaluation Upon our arrival today,the contractor had prepared elevator pit footing subgrade soils.The elevator pit footing excavation was about 13.5-ft long, 10.5-ft wide and 6-ft below adjacent basement concrete slab. The sides of the excavation consisted of silty sand with gravel and wood debris in the upper 4-ft, and silty sand with gravel in the lower 2-ft.The elevator pit footing subgrade soils consisted of silty sand with gravel. We evaluated the elevator pit footing subgrade soils,using a Yh-in diameter steel T-probe rod.The elevator pit footing subgrade soils probed about 1-ft to 1.5-ft under moderate pressure, indicating loose condition. The contractor indicated that they have over-dug to about 1-ft to 1.5-ft below bottom of footing elevation due to recent changes with the size of the planned service elevator. Also, we performed one shallow hand tool explorations by removing an additional 1.5-ft soils below planned elevator pit footing elevation. The soils observed consisted of silty sand with gravel. We evaluated the bottom of the exploration using a l-in diameter steel T-probe rod. The bottom of the exploration probed about less than an inch under moderate pressure, which we interpreted to be native till. We interpreted the elevator pit footing subgrade to be disturbed soil. This field report is for information purposes only. Superinte t/Representative: Technician:Niccolo Guiao 4303—198th Street SW•Lynnwood,Washington 98036•(425)485-5519•FAX(425)485-6837 With Offices Serving the Western United States 215