3829 SHORE AVE 2018-01-02 MF Import

along the slope area. Scattered hand dug piLs were excavated into the slope to determine soil type. Areas of apparent slope failure or erosion, and water outfalle were noted. These observed conditions are graphically shown on the enclosed location/geologic map. The slope area was photographed from along the northern side of the Burlington Northern Railroad tracks at 50 foot intervals. GEOLOGY � The geology of the study area is best illustrated on the enclosed geologic map and boring logs. In general, the area is underlain by at least two sequences oS glacial deposition and one sequence of interglacial (non-glacial) deposition. The oldest deposit encountered appears to be the Double Bluff Formation, consisting of glacial drift and associ- ated advance and recessional deposits. Generally� the Double B1ufS material is quite dense and compact due to averriding by subsequent recent glacial ice advance . The soils vary from a well bedded sand and sand/�ilt to a cemented gravel to a marine (fossiliferous) drift to massive bedded sands and gravels. These materials are locally deformed, probably through past tectonic activity, and are generally found as the basal material observed in the area. UnconSornably overlying the Double Bluff Pormation is a thick sequence of non-glacial sands, sand/silt and interbedded terres- trial deposits including sporatic organics. These soils are considered to be deposits of the Whidbey Formation. Within thia local. the Whidbey Formation deposits are quite well compact and dense. They generally consist of interbedded sands and silts near the base of the deposit, and are cleaner towards the upper portion of the deposit. The majurity of the slope area observed, particularly the western porti.on, appears to consist of the Whidbey Formation materials. -3-