3333 NASSAU ST 2024-08-07 - Laserfiche WebLink

October 3,2016 Single-Family Residence L&A Job No. 16-124 Page 4 generally granular composition, the advance outwash deposits are of moderately-high permeability and drains fairly well. Where exposed on slopes with poor vegetation cover, the soils in the surficial 2 to 3 feet of this soil unit may be weathered and eroded to a loose state, while the underlying fresh advance outwash deposits are generally dense to very-dense in their natural, undisturbed state. The fresh outwash deposits in their native, undisturbed state can provide good foundation support with little settlement expected for light to moderately heavy structures. The deposits of the transitional beds soil unit are composed of glacial and non-glacial deposits consisting mostly of massive, thick or thin beds and laminae of gray to dark-gray fine-sandy to clayey silt. They are consisted mostly of massive, thick or thin beds and laminae of gray to dark-gray, fine-sandy to clayey silt The transitional beds deposits were laid down in lakes at some distance away from the ice front and in fluvial systems prior to the advance of the glacial ice. The sediments were mostly deposited during the transitional period near the close of pre-Fraser interglacial time and into early Fraser glaciation time. The transitional beds deposits are generally very-stiff to hard in its native, undisturbed state. The soils in the upper few feet of this soil, unit was often sheared by movement of glacial ice and may contains fissures,joints and fractures. This fractured zone may become unstable on steep slopes when the fissures and joints are filled with water and saturated. The fresh transitional beds deposits free of fractures can provide good foundation support to structures with little settlement if they are properly and adequately drained. LW & ASSOCIATES, INC.