954 NORTH PARK DR 2023-10-31 - Laserfiche WebLink

GeoTest Services, Inc. September 6, 2019 Proposed Swimming Pool — 954 North Park Drive, Everett, WA Project No. 19-0361 -- - — Photo 3. Drone photograph of property and slope, facing southeast. Subsurface Soil Conditions Subsurface conditions were explored on July 29, 2019 by advancing two hand-augered test holes (HA-1, HA-2) and Dynamic Cone Penetrometer (DCP-1, DCP-2) explorations at the approximate locations shown on the Site and Exploration Plan (Figure 2). DCP explorations included advancing a steel rod through the site soils using a 35-pound drop hammer. The number of blows required to drop the rod 4 inches (10 centimeters) was recorded and correlated with the density of granular soil deposits and the consistency of cohesive soils. The explorations generally encountered medium -dense to dense, slightly silty sand (possible fill) underlying approximately 6 to 18 inches of topsoil. The fill appeared to extend to an approximate depth of 3 to 5.5 feet below ground surface (BGS), at which point the soil transitioned to a native, soft to medium -stiff, silt and clay (interpreted as Transitional Beds). This soil became stiff to very stiff at approximately 5 to 6.5 feet BGS and then very stiff with depth to the maximum explored depth of the explorations. The hand-augered test holes were explored to approximate depths of 1 foot and 6.5 feet BGS respectively, whereas the DCP explorations were advanced to approximate depths of 11 feet and 9 feet BGS respectively. General Geologic Conditions Geologic mapping of the project area was obtained from the Geologic map of the Everett 7.5- minute quadrangle, Snohomish County, Washington (Minard, 1985), published by the U.S. Geological Survey. The property appears to be situated in close proximity to mapped geologic contact of Vashon Till (Qvt) to the south and transitional beds (Qtb) to the north. The till unit is a glacially deposited, non -sorted mixture of mud, sand, pebbles, cobbles and boulders that has M