2211 GIBSON PL Geotech Report 2023-04-06

r r August 18, 2014 Gibson Bluff L&A Job No. 14-056 Page 9 Esperance sand soil. The Esperance sand soil is of moderately high to high permeability. Therefore, disposal of stormwater onsite by infiltration is feasible. Site Preparation and General Grading Vegetation within construction limits should be cleared and grubbed. Existing structures to be demolished should also have their foundations removed. Topsoil and unsuitable weathered soil should be completely stripped within the building pads and in areas subject to traffic and structural load. The exposed soils should be compacted to a non-yielding state with a vibratory mechanical compactor and proof-rolled with a piece of heavy earthwork equipment. Temporary Drainage and Erosion Control The site is mantled by layers of topsoil and weathered soil with a high percentage of fines and these soils are moisture sensitive. These weak surficial soils can be easily disturbed and cause construction complications when saturated. A layer of clean, 2-to-4-inch quarry spalls should be placed over areas of frequent traffic, such as the entrance to the site, as required, to protect the subgrade soils from disturbance by construction traffic. Silt fences should be installed along the downhill sides of construction areas to minimize transport of sediments onto neighboring properties, the steep slopes, or the streets. The bottom of the filter cloth of silt fences should be anchored in a trench filled with onsite soil. LIU & ASSOCIATES, INC.