2211 GIBSON PL Geotech Report 2023-04-06

r r August 18, 2014 Gibson Bluff L&A Job No. 14-056 Page 5 allow stormwater to seep through relatively easily. The Esperance sand deposits can stand in steep cuts or natural slopes for extended period when undisturbed. Where exposed on slopes devoid of vegetation cover and subject to storm runoff or groundwater seepage, the Esperance sand deposits can be gradually eroded and may slough and redeposit to a flatter inclination. Soil Condition Subsurface condition at the site was explored on June 16, 2014, with three test borings drilled with a portable drill rig owned and operated by Davies Drilling of Seattle. The approximate locations of the test borings are shown on Plate 2 - Site and Exploration Location Plan. The test borings were each drilled to 31.5 feet deep. Soil samples obtained from the test borings were visually classified in general accordance with United Soil Classification System, a copy of which is presented on Plate 3. A geotechnical engineer from our office was present during the exploration, examined soil samples retrieved from the test borings, recorded soil and geologic conditions encountered, and completed logs of the test borings. Detailed descriptions of the soil layers encountered during site exploration are presented in test boring logs on Plates 4 through 6. Standard Penetration Tests were conducted, in accordance with ASTM D-1586, in the bore holes using a standard split-spoon sampler of 2-inch outside diameter, driven with a 140-pound hammer that was raised and released for a 30-inch free fall. The number of blows required to advance the sampler a given distance is an indication of the density for granular soils or the consistency of cohesive soils. The sampler was advanced 18 inches LIU & ASSOCIATES, INC.