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Geotechnical Engineering Report 14 January 8,2021 <br /> Glint Car Wash and Sonic Everett,Everett,Washington RGI Project No.2020-643-1 <br /> scales, a foot per minute gauge, and a RPM vane feeder in order to provide control of the <br /> cement distribution process. <br /> Compaction: The cement-stabilized base will be uniformly compacted to a minimum of 95 <br /> percent of maximum density based on a moving average of five consecutive tests with no <br /> individual test below 92 percent. Field density of compacted soil-cement shall be <br /> determined by the nuclear method in the direct transmission mode (American Society for <br /> Testing and Materials D6938-10 Standard Test Method for In-Place Density and Water <br /> Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth) (ASTM D6938). <br /> The specified optimum moisture content and maximum density shall be determined prior <br /> to the start of construction and also in the field by a moisture-density test, (ASTM D1557), <br /> on representative samples of soil-cement mixture obtained from the area being <br /> processed at the time compaction begins. The soil-cement shall be compacted by a <br /> vibratory roller to the specified density. <br /> Finishing: When initial compaction is nearing completion at subgrade elevations, the <br /> surface of the soil cement will be shaped to the required lines, grades, and cross section. <br /> The moisture content of the surface material shall be maintained at or not less than 2 <br /> percent below or above the specified optimum moisture content during finishing <br /> operation. Compaction and finishing shall be done in such a manner as to produce, in not <br /> longer than 2 hours, a smooth, dense surface free of compaction planes, cracks, ridges, or <br /> loose material. <br /> With the pavement subgrade prepared following the above procedure, RGI recommends <br /> the following alternative pavement sections for street or heavy truck traffic and general <br /> parking areas paved with flexible asphalt concrete surfacing. <br /> > For street or heavy truck traffic areas: 4 inches of HMA over 4 inches of crushed <br /> rock base (CRB) over 18 inches of treated soil subgrade <br /> > For general parking areas: 3 inches of HMA over 4 inches of CRB over 12 inches <br /> of treated soil subgrade <br /> ➢ For drive-thru areas: 5 inches of concrete over 4 inches of CRB over 18 inches of <br /> treated soil subgrade <br /> 6.0 Additional Services <br /> RGI is available to provide further geotechnical consultation throughout the design phase <br /> of the project. RGI should review the final design and specifications in order to verify that <br /> earthwork and foundation recommendations have been properly interpreted and <br /> incorporated into project design and construction. <br /> Corporate Office <br /> 17522 Bothell Way Northeast <br /> Bothell,Washington 98011 <br /> Phone 425.415.0551• Fax 425.415.0311 <br /> xw.riley-group.com <br />