4613 BAKER DR 2019-06-10 - Laserfiche WebLink

KRAZAN&ASSOCIATES, INC. KA No. 09216017 Pre-Purchase Reconnaissance 4613 Baker Drive Everett,WA August 12,2016 'age No. 2 V Recessional outwash typically consists of poorly to moderately sorted, medium dense sand with gravel, and the Whidbey Formation generally consists of moderately sorted, dense/hard sand, silt and clay deposits. Glacial till typically consist of an unsorted, compact mixture of clay, silt, sand, gravel, cobbles and boulders. Esperance Sand typically includes moderately sorted, dense to very dense sand with a few pebbles. Site Reconnaissance A Krazan geotechnical representative visited the subject property on August 11, 2016 and met with you to conduct a geotechnical walk-through reconnaissance of the site. The southern portion of the property is nearly level to gently sloping, and is occupied by a residence with an attached garage. A steep slope is located in the northern portion of the property, and extends down to the north. The BNSF Railroad is located near the bottom of the steep slope, and Possession Sound is located north of the railroad tracks. The residence is setback approximately 63 to 88 feet from the top of the steep slope. The total elevation change at the steep slope is approximately 150 feet, as indicated by the Snohomish County "SnoScape" map. According to "SnoScape" map topographic information, the southern portion of the property near Baker Drive has an elevation of approximately 180 feet above sea level. Vegetation, including a lawn, bushes and a few small trees, cover the area around the house in the southern portion of the site. The upper portion of the steep slope is covered with thick brush, including berry vines. Mature evergreen and deciduous trees cover the lower portion of the steep slope. It appears that grass clippings/yard waste has been discarded along the top of the steep slope for an extended period of time and has formed a soft/loose layer at the top of the slope. Conclusions and Recommendations During our limited surficial reconnaissance of the property, we did not observe noticeable signs of recent subsidence. Additionally,we did not observe significant signs of recent slide scarps or slumps within the site that would indicate current instability on the steep slopes within the property. However, the steep slope is heavily vegetated and observations of soil conditions on the slope were very limited. Some minor loose/soft areas were observed within a few feet of the top of the slope in areas where grass clippings apparently had been placed over the years. The medium dense to very dense, granular, native soils that are interpreted to underlie the property are considered to have good strength. Accordingly, it is our opinion that the upper, nearly level portion of the site is stable under current conditions. The current building setback from the top of the steep slope should provide an adequate buffer for the anticipated natural slope recession over time. The control of surface water and near-surface groundwater is very important for the long-term stability of the steep slopes at this site. Krazan&Associates,Inc. Serving The Western United States