1001 39TH ST 2016-01-01 MF Import

DAVIO L. NELSON AND b550CIATcS, INC. Consulting Engineering Geology November 27, � 991 Project No. 10541 Page 2 Tlie scope or" services included performance of four ( 4l exploratozy backhoe ( test? pits, performed on site. The approximat� locations of the test oits are shcwn on the Location Map. We also performed visual o5servation on and arocnd the site, and reviewed available soi:Ls and geologic maps of the aYea. All elevations mentioned in this report refer to existing grade, and to sike layout information shown on maps pro�•�ded by you . ' LOCATZON & SITE DESC:2ZPTION The site consists of lots 25-3G, Block 29, of Hewitt Hei3hts Addition. The approximate site ad3ress is 1001 - 39th Street within the city of Everett, Washington. Presently, the site is undeveloped, but shows signs cf past surface grading and/or filling activities, particularly along the upslope portions . Residenc�s exist adjacent to the east and ;scross 39th Street to the soutii, Vegetation within the lot consists of small to large siz�d cseciduous trees, wzth most of the area covered with grass, brush a[id blackberry vines . Topographically, the lot is highest within the southeastern portion and slightly sloping down from this area to the north and west. Just downslope f.rom this area, the site s�opes moderately to steeply down to the west and north into an existing draiaage ravine. SOILS CONDITIONS The subsur.face soiis stratigraphy can best be seen on the enclosed test pit logs. In c�eneral, we found the area to be undexlain by glacial and i- terglacial deposits . The glacial deposits consis4 of outwast� sands and silty sands with the incerglacial depos:its being finer grained sandy silt and silt. These interglacial deposits are interpreted as the Whidbey Fermation. Fill was foun3 over most of the site, with the tt.icker deposits being on or near the upper porticns of the steep slopes. The basal native soils encountered were found to consist of grey- brown to grey, stiff to dense, fine sandy silt and silty fine sand, considered the Whidbey Formation. This deposit was encountered in TP-4 at depths below 1 foot below the g-round surface. The Whidbey soils were not found in any of the other _ �:;t pits . The other test pits encountered grey-brown to grey, lacse to medium dense, slightly silty, poorly sorted and fine to medium grained sand, considered giacial �utwash (recessional?) deposits . These deposits were encountered at depths below abovt 3 to 7 feet below grade and are expected to overlie the Whidbey Formation at depth, �� ` jl(o�