7505 SEAWAY BLVD Geotech Report 2022-10-25

PHASE I EXPLORATIONS HWA GeoSciences Inc. (HWA) conducted four(4) geotechnical borings during Phase I explorations. The borings were advanced by Holocene Drilling Inc., of Fife, Washington, on August 15th, 2014. A hollow stem auger and automatic hydraulic hammer was used to advance these borings. PHASE II EXPLORATIONS HWA GeoSciences Inc. (HWA) advanced two (2)machine-drilled boring and five (5) hand borings during Phase II explorations. The machine drilled boring was advanced by Environmental Drilling Inc. (EDI), of Snohomish, Washington, using a hollow stem auger. The hand borings were advanced by HWA personnel on February 2n1, 2016. Dynamic cone penetrometer(DCP)testing was performed in each hand boring to evaluate soil density at depths below the bottom of the hand boring. Standard Penetration Test(SPT) sampling was performed using a 2-inch outside diameter split-spoon sampler driven by a 140-pound auto hammer for all machine-drilled borings. During the SPT, samples were obtained by driving the sampler 18 inches into the soil with the hammer free-falling 30 inches. The numbers of blows required for each 6 inches of penetration were recorded. The Standard Penetration Resistance ("N-value") of the soil is calculated as the number of blows required for the final 12 inches of penetration. This resistance, or N-value,provides an indication of relative density of granular soils and the relative consistency of cohesive soils; both indicators of soil strength and foundation bearing capacity. A geotechnical engineer or geologist from HWA logged each exploration and recorded all pertinent information. Pertinent information including soil sample depths, stratigraphy, soil engineering characteristics, and ground water occurrence was recorded. The stratigraphic contacts shown on the individual exploration logs represent the approximate boundaries between soil types; actual transitions may be more gradual. The soil and ground water conditions depicted are only for the specific date and location reported and, therefore, are not necessarily representative of other locations and times. A legend of the terms and symbols used on the exploration log is presented in Figure A-1. Summary logs of the borehole exploration are presented in Figures A-2 through A-12.