304 SE EVERETT MALL WAY PANERA BREAD Geotech Report 2025-07-25

KA No.092-12004 August 24,2012 Page No. 3 Our explorations generally encountered variable amounts of undocumented fill overlying native, glacially derived soils. We interpreted the medium dense native silty sand with gravel to be glacial drift, and the dense to very dense native silty sand with gravel to be glacial till. FIELD INVESTIGATION A total of seven (7) exploratory soil borings were completed to evaluate the subsurface soil and groundwater conditions in the proposed construction areas. The soil borings were completed on June 12, 2012 with a subcontracted drill rig, and the soil borings extended to depths of 6.5 feet to 19.0 feet below the existing ground surface. Representatives from Krazan and Associates were present during the explorations, examined the soil conditions encountered, obtained samples of the different soil types, and maintained logs of the explorations. The approximate locations of the soil borings are shown on the Site Plan in Figure 2. Representative samples of the subsurface soils encountered in the geotechnical explorations were collected and sealed in plastic bags. These samples were transported to our laboratory for further examination and testing. The soils encountered in the exploratory borings were continuously examined and visually classified in accordance with the Unified Soil Classification System (USCS). A more detailed description of the field investigation is presented in Appendix A. SOIL PROFILE AND SUBSURFACE CONDITIONS The soils encountered in the soil borings generally consisted of variable amounts of undocumented fill overlying medium dense to very dense native soils. We interpreted the native soils to be glacially derived materials. A site plan showing approximate fill depths is shown in Figure 3. Additional information about the soils encountered is presented in the logs of the soil borings in Appendix A. GROUNDWATER The soil borings were checked for the presence of groundwater during drilling operations. Groundwater seepage was encountered at a depth of approximately 12.5 feet in soil boring B-2; 15.5 feet in soil boring B-3; and 14.0 feet in soil boring B-5. We interpreted the water seepage to be perched groundwater on dense glacial till. Perched groundwater typically occurs when surface water infiltrates through less dense,more permeable soils and accumulates on top of a relatively low permeability soil layers. This type of groundwater does not represent a regional groundwater"table" within the upper soil horizons. Perched water tends to vary spatially and is dependent upon the amount of rainfall. We would expect the amount of perched water to decrease during drier times of the year and increase during wetter periods. It should be recognized that groundwater elevations may fluctuate with time. The groundwater level will be dependent upon seasonal precipitation, irrigation, land use, and climatic conditions, as well as other factors. Therefore, groundwater levels at the time of the field investigation may be different from Krazan&Associates,Inc. Eleven Offices Serving The Western United States