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Geotechnical Engineering Report 12 January 8,2021 <br /> Glint Car Wash and Sonic Everett,Everett,Washington RGI Project No.2020-643-1 <br /> firm and relatively unyielding before paving. This condition should be verified by <br /> proofrolling with heavy construction equipment or hand probe by inspector. <br /> With the pavement subgrade prepared as described above, RGI recommends the <br /> following new pavement sections for parking and drive areas paved with flexible asphalt <br /> concrete surfacing. <br /> ➢ For heavy truck traffic areas: 4 inches of Hot Mix Asphalt (HMA) over 8 inches of <br /> crushed rock base (CRB) over 18 inches of structural fill over a woven fabric <br /> ➢ For general parking areas: 3 inches of HMA over 6 inches of CRB over 12 inches of <br /> structural fill over a woven fabric <br /> The asphalt paving materials used should conform to the Washington State Department <br /> of Transportation (WSDOT) specifications for Hot Mix Asphalt Class 1/2 inch and CRB <br /> surfacing. <br /> ➢ For drive-thru areas: 5 inches of concrete over 4 inches of CRB over 18 inches <br /> structural fill over a woven fabric <br /> Long-term pavement performance will depend on surface drainage. A poorly-drained <br /> pavement section will be subject to premature failure as a result of surface water <br /> infiltrating into the subgrade soils and reducing their supporting capability. <br /> For optimum pavement performance, surface drainage gradients of no less than two <br /> percent are recommended. Also, some degree of longitudinal and transverse cracking of <br /> the pavement surface should be expected over time. Regular maintenance should be <br /> planned to seal cracks when they occur. <br /> 5.9 CEMENT TREATMENT <br /> As an alternative to overexcavation, cement treatment can be considered for pavement <br /> subgrade support. If cement treatment will be used, the mix shall consist of onsite fill <br /> Portland cement, and water (if necessary) uniformly mixed, graded, compacted, finished, <br /> and compacted in accordance with these recommendations. <br /> Portland Cement: Portland cement shall be Type II and shall be provided in accordance <br /> with Section 9-01 of the 2012 Washington State Department of Transportation (WSDOT) <br /> Standard Specifications. Cement may be stored on site for use during the treatment <br /> process in a closed container <br /> Water: Water shall be provided by the contractor and shall be free from substances <br /> deleterious to the hardening of the soil-cement. <br /> Corporate Office <br /> 17522 Bothell Way Northeast <br /> Bothell,Washington 98011 <br /> Phone 425.415.0551• Fax 425.415.0311 <br /> www.riley-group.com <br />