11310 EVERGREEN WAY 2018-01-01 MF Import

. I � Mr. Bnxe Vanderwall _. April 16, 2008 i The gradient over the property is gentle and downward to tfie southwest. A small 10 to ^� 15 foot high slope descends down to a stream along the south and soutl�west margins � of the property. This slope has gredients of about 25 to 30 percent along the south . margin of the property and 15 to 20 percent below tl�e west property line in the . southwest quadrdnt of the site. The slope has been planted and the stream mitigated. for the Wat-Mart project. • , A small wood-fiame office for a painting conhactor exists in the south section of the property. A small mobile trailer in the northwest sectfon is the offtce for a used car sales company. Some portions of the site are fenced, but most of the remaining site area is covered with business parking and used cars for sale. No springs or surface water were noted anywhere on the gently sloping site or the adjacent slopes to the south and southwest. Subsu�face � It appears that the building pad area lies near the border between the eastem pre- existlng grade and the westem fill areas from old development on the site. The two westem borings aligned along the planned west building wall encountered three to seven feet of old fill. The borings drilled along the planned east buiiding wall did not encounter any old fills. It appears tt�at the site area was leveled long ago by cutting along the east site margin and filling across the sbpe of the pre-existing stream swale. . While about s(x or seven feet of fill underlfes the planned southwest buflding comer, the fills may be up to ten feet deep under the extreme southwest property tomer. - fie fills consfst of silry sand soils containing some graveis and small debris along with scattered organics. We anticipate that the original topsoil on the old stream swale � slopes was not stripped years ago prior to filling, This topsoil was encountered in Boring B-4. The fill directly overlies a red tan to tan, weatl,�red till layer of several feet in thickness. � The deeper unweathered glacial till layer Ues under much of the planned east side of bu(Iding at shallow grades and at about 5 to 7 feet in depth under the filis along the west wall area. The native soils �ontaining the glacial ti�i were deposited about 12,000 to 15,000 years ago by the last Ice Age glacier to cover the Puget Sound lowlands. Up to 5,000 feet of ice consolidated the unsorted mix of sand, silt, and gravel into the very dense present day dll material. The native glacial till soil unit is mapped throughout the area on the Soil Conservation Service maps and is called Alderwood Group soil. Project No. 12 �"`1 Page No 4/)� �