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Geotechnical Engineering Report 4 May 25,2017 <br /> Central Everett CHC,Everett,Washington RGI Project No.2017-094 <br /> RGI reviewed the results of the field and laboratory testing and assessed the potential for <br /> liquefaction of the site's soil during an earthquake. Since the site is underlain by dense, <br /> glacially consolidated deposits, RGI considers that the possibility of liquefaction during an <br /> earthquake as minimal. <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, the site does not <br /> contain geologically hazardous areas. <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. RGI recommends that the proposed new building elements be supported on <br /> spread footings bearing on medium dense native soil or deep foundations consisting of - <br /> micro piles or helical anchors. <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 /> The scope of the earthwork was not clear at the time this report was prepared but we <br /> expect the expanded building and new trash enclosure will require some excavations to <br /> allow footing and pile installation. <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 /> 111 <br /> " <br /> RILEYGROUP <br />