1231 MADRONA AVE 2016-01-01 MF Import

r � ' LJ ' ' � � , � - � Genlrxic Inve.e(i¢alion and Gn,otechnicol En¢ineerine Rennr( l?3J Aladrona: h�e. - Ln( 2 — ErerefL IPhehinglorr �- 97-01-20 past slope movement or an unmaintained and partiaily Slled in snnall reflection pond site. Very soft sur6cial soil and standiug water was noted in this locatiun at the time of our site investigation. Topography ofthe lot is moderately sloping from Madrona westward, down to a flat, apprwdmately 45 to 60 foot wide bench along the top ofthe bluffon the western side ofthe property. Elevations, as shot by McDuffy arrd Assoc. and contained on the supplied site plans, range from el. 138 along Madrona Ave tu approx'vnately el. 110 at the back of the bench located along the top of the bluff overlooking the 6ound. We understand diat an approximate 25 ft. wide right-of-way for a sewer line runs across the property on this bench. A very steep, high bluff runs along the westem side of the property and drops dowL to the BNRR tracks along the Sound at el. 10. A Site Map showiug the location of the existing improvements, the existing topography and site explorations is included in Appe�rdix B of this report. 3.2 Geologic Settine The site lies in a geologic region lo�own as the Puget Sound Lowland Physiographic Province. The Puget Sound Lowland Physiographic Province consists of a linear depression which trends in a north- south direction betwcen the Olympic Mountains to the west and the Cascade Mountains to the east. The Lowland contains the majority of the Puget Sound Basin area. During the recent geologic past, within the last 1 million years or so, the topogapl�y of the Lowland was altered by a series of glacial events originating out of t6e Canadian Rockies (cwttine�rta! rce ,/lows) and the northern Cascade Mountains (regia:al ice flows). Deposits of at least four (4) Pleistocene aged glaciations have been identified in tLe t'uget Som�d Lowland Physiograpl»c I'rovince. 7'he last of these glaciations lias been named tl�e Fraser. 7'I�e Fraser Glaciatiou includes two (2) recognized advances (slades) separnted by an interstade - or rc[reat period. 71�e younger stade ofthe Fraser Glaciation is locaily Irnown as the Sumas, while the older is called the Vasl�on Stade. Deposits from tLe Vashon Stade and the older interstade (pre-'r�shon deposits) are found within the project area. SurficiTl geologic deposits in the project area ' 4 GES, lnc. �