1010 N BROADWAY STARBUCKS Geotech Report 2025-07-24

Geotechnical Engineering Evaluation lrerracon Broadway& 10th Starbucks Everett, WA January 9, 2014 Terracon Project No. 81135080 encountered, it could affect certain qeotechnical recommendations presented herein, such as for foundation subgrade preparations and reuse of on-site soils. 5.2 Site Preparation Preparation of the project site will involve tasks such as demolition, temporary drainage, stripping, cutting, filling, erosion control, and subgrade compaction. The paragraphs below present our geotechnical comments and recommendations concerning these various issues. Demolition: The first step in site preparation will likely consist of demolishing all existing structures and appurtenances. Any associated underground structural elements, such as old footings, stemwalls, and sign foundations, should be removed as part of this demolition operation. Also, any abandoned sewerlines, drainpipes, or other underground utilities should be either removed or grouted in place Temporary Drainage: Any sources of surface or near-surface water that could potentially enter the construction zone should be intercepted and diverted before stripping or grading activities begin. We tentatively anticipate that a system of temporary curbs or berms placed around the upslope sides of the construction zone will adequately intercept most surface water runoff. However, the selection of an appropriate drainage system will depend on the water quantity, season, weather conditions, construction sequence, and contractor's methods; therefore, final decisions regarding temporary drainage details are best made in the field at the time of construction. Clearing and Stripping: After surface and near-surface water sources have been controlled, the construction zone should be cleared and stripped of all existing pavements, slabs, sidewalks, and residual topsoils. Our borings revealed about 3 inches of asphalt pavement within the parking lot, but variations could occur. Stripping depths should be adjusted as needed to remove all root mats, muck, and other deleterious materials, if encountered. Weather Considerations: It should be realized that if the stripping or cutting operations proceed during wet weather, greater stripping depths might be necessary to remove disturbed moisture-sensitive subgrade soils. For this reason, site earthwork is best performed during a period of dry weather. 5.3 Spread Footings Conventional spread footings can be used to support the proposed building if the subgrades are properly prepared as recommended in this report. We offer the following comments and recommendations concerning design and construction of spread footings. In the event that unfavorable soil conditions are revealed by future excavations, then supplemental Reliable ;=_ Responsive Convenient E Innovative 7