8525 EVERGREEN WAY BURGER KING 2021-05-10

Geotechnical Engineering Evaluation NGA File No. 998317 Burger King Restaurant Development August 2,2017 Everett,Washington Page 5 We recommend that the restaurant be designed utilizing conventional spread foundations. Footings should extend through any undocumented fill, organic soil, or loose materials, and be founded on the underlying medium dense or better native soils encountered at depth. Specific development plans for the site were not available at the time this report was prepared. We should be retained to review grading plans once development plans are finalized. The soils anticipated to be encountered during excavation are considered to be moisture-sensitive and will disturb when wet. We recommend that construction take place during the drier summer months if possible. However, if construction takes place during the wet season, additional expenses and delays should be expected due to the wet conditions. Additional expenses could include the need for placing a blanket of rock spalls on exposed subgrades, construction traffic areas, and paved areas prior to placing structural fill. Some of the non-organic on-site soils could be used as structural fill, provided they could be compacted to specifications. This will depend greatly on the moisture content of the soils at the time of construction. NGA should be retained to determine if the on-site soils can be used as structural fill material during construction. We recommend that temporary and final site grading be designed to direct surface water away from the structure. We recommend that all stormwater generated on the site be collected in tightlines and directed to an appropriate stormwater system. This is further described in the Site Drainage subsection of this report. We recommend that NGA be retained to review final project plans and provide consultation regarding structure placement, site grading, and foundation support. We also recommend that NGA be retained to provide monitoring and consultation services during construction to confirm that the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should the conditions revealed during the work differ from those anticipated, and to evaluate whether or not earthwork and foundation installation activities comply with contract plans and specifications. Erosion Control Measures The erosion hazard for the on-site soils are listed as moderate, but the actual hazard will be dependent on how the site is graded and how water is allowed to concentrate. Best Management Practices (BMPs) should be used to control erosion. Areas disturbed during construction should be protected from erosion. Erosion control measures may include diverting surface water away from the stripped or disturbed areas. Silt fences and/or straw bales should be erected to prevent muddy water from leaving the site or flowing over the slopes. Stockpiles should be covered with plastic sheeting during wet weather. Disturbed areas NELSON GEOTECHNICAL ASSOCIATES,INC.