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Geotechnica/Engineering Report 4 January 7,2020 <br /> QFC 852 Fuel Station,Everett, Washington RGI Project No.2019-258A <br /> 4.6 GEOLOGIC HAZARD AREAS <br /> Regulated geologically hazardous areas include erosion, landslide, earthquake, or other <br /> geological hazards. Based on the conditions observed on the site, RGI considers there is <br /> no geological hazards related to the site. <br /> 5.0 Discussion and Recommendations <br /> 5.1 GEOTECHNICAL CONSIDERATIONS <br /> Based on our study, the site is suitable for the proposed construction from a geotechnical <br /> standpoint. The very loose fill encountered at the site is not suitable for supporting the <br /> canopy foundation directly and should be removed and replaced with structural fill. The <br /> canopy foundations can be supported on conventional spread footings bearing on <br /> competent native soil or structural fill. Slab-on-grade floors and pavements can be <br /> similarly supported on competent native soil or structural fill. <br /> Detailed recommendations regarding the above issues and other geotechnical design <br /> considerations are provided in the following sections. These recommendations should be <br /> incorporated into the final design drawings and construction specifications. <br /> 5.2 EARTHWORK <br /> RGI expects that site grading will consist of shallow cuts and fills to achieve building and <br /> pavement grades and excavation for utilities including storm, water, sanitary sewer, and <br /> other utilities. <br /> 5.2.1 EROSION AND SEDIMENT CONTROL <br /> Potential sources or causes of erosion and sedimentation depend on construction <br /> methods, slope length and gradient, amount of soil exposed and/or disturbed, soil type, <br /> construction sequencing and weather. The impacts on erosion-prone areas can be <br /> reduced by implementing an erosion and sedimentation control plan. The plan should be <br /> designed in accordance with applicable city and/or county standards. <br /> RGI recommends the following erosion control Best Management Practices (BMPs): <br /> > Scheduling site preparation and grading for the drier summer and early fall <br /> months and undertaking activities that expose soil during periods of little or no <br /> rainfall <br /> > Establishing a quarry spall construction entrance <br /> > Installing siltation control fencing or anchored straw or coir wattles on the <br /> downhill side of work areas <br /> ➢ Covering soil stockpiles with anchored plastic sheeting <br /> 1 i ill <br /> RILEYGROUP <br />