4107 OLIVE ST 2018-01-02 MF Import

• �,1 DAVID L. NELSON AND ASSOCIATES, INL. Consulting Engineering Geology • July 13, 1990 - Project No. 9490 • Page 2 Olive Street, and the south side of Temple Drive, in the city of Everett, Washington. Presently, the site is undeveloped, but has been the scene of some past •• clearing, grading and earthwork activity. The site is highest along Olive Street, and slopes gently to moderately to steeply down from the west to the east and north. The site are> is primarily covered with blackh3rry vines, grass and a few scattered deciduous trees. SOILS CONDITIONS The subsurface soils stratigraphy can best be seen on the enclosed test pit logs. In general, we found the area to be underlain by glacial deposits and •� interglacial deposits. The glacial deposits consist of glacial till and with the interglacial deposits being finer grained sandy silt and silt. These interglacial deposits are interpreted as the Whidbey Formation. Fill was ., found over portions of the site, with the thicker deposits being in the vicinity of TP-1, TP-1 a TP-5, and thinner fill areas in the vicinity of TP-6, TP-7 and TP-S. 1 The basal rative soils encountered were found to -consist of grey -brown to • grey, medium dense to stiff and very dense to very hard, silty fine sand and fine sandy silt, with scattered sand lenses, considered the Whidbey Formation. These deposits were encountered in all test pits except TP-7, and at depths of below about 2.5 to 7 feet below the ground surface. The Whidbey soils were found to typically exhibit a weathered zone of about 2 to 1 feet thick, and composed of orange -brown to grey -brown, loose to medium dense and stiff, silty sand and sandy silt, and poorly sorted silty sand and poorly sorted sand. Glacial till, composed of grey -brown to grey, dense, poorly sorted silty sand with gravel, was encountered at depth in TP-7. 1. The surficial soils encountered across: the site area were found to consist of fill and native surface soils. Beneath the fill, and native organic• topsoil layers, we ercountered a strata consisting of about 2 to 2.5 feet of brown to