2616 BAKER AVE 2018-02-01 - Laserfiche WebLink

. • • � Geotechnical Reconnaissance 2616 Baker Avenue Everett, Washington August 28, 2015 No new net impervious area will be added to the site as a result of the construction. Proposed construction is entirely within previously developed area on thc lot. A plot plan prepared by the structural engineer is provided on Figure 2, Site Plan. Observations 1. Geologic Maps of thc area indicate that the site is likely underlain by glacially consolidated sediment (Preliminary Surficial Geologic Map of the Markilteo and Everett Qarad�-angles, Snohomish Coarnty, Washington, Mackey Smith, 1976.) Specifically the site appears mapped as underlain by Glacial Till. Glacial Till gcnerally consists of unsorted mixtures of silt, sand, clay and gravel pushed over thc existing landscape in front and under the advancing glacier thousands of years ago. The material is noted for its very dense consistency, ability to stand unsupported in near vertical relief, and relative impermeability. It provides excellent foundation support. A portion of the geolo�ic map cited is provided in Figure 3, Geologic Map. 2. The parcel is situated on a relatively flat lot, cicvated approximately 3 feet above the grade of Baker Avenue, but at about thc samc gradc as the alley on the west sidc of the lot. 3. The existing residence is approximately 100 years old and supportcd on post and pier foundations. The picrs consistcd of pier blocks about 12 inches square and embedded about 3 inches into the ground insidc the crawl space. Thc crawl space was about 24 inches hiQh. Setticment of thc piers is evident on thc main floor of the house. Differential settlement on thc ordcr oF4 inches was obscrvcd with thc most scttlemcnt obscrvablc ncat-thc northcastcrn corncr of thc}�ousc ncar tllc porch. 4. The site was ve�etatcd mostly with lawn, �ardcn beds, a fcw shrubs, and a co�iple mature trccs. We observed no indication of surficial erosio�� on the site. 5. The drainagc from dow�ispouts appears to discllarge directly onto the ground near the cxistin�house perimetcr. Somc downspouts havc cxtcnders on them. 6. We advanced thrce shallow h�nd holes suppleinented with probe tests on the site in�order to identify thc subslirface soil conditions. The locations of thc holes are shown of Figure 2, Site Features. The site appcars undcrlain by mcdium dense to dense, silty SAND with gravel at a depth of about 3 fcet in our tcst holcs. The silty SAND wlit was blanketed by a layer of loose silty SAND, containing organic fragments. We interpreted the site as underlain by densc glacial till manticd by a unit of weathered till and topsoil about 3 feet thick. 1841 Geo Lettcr Rcport 2 �1,� The Galli Grozrp _...�~r..: