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Geotechnical Engineering Report- Revised l��rracon <br /> Proposed CFT Retail Everett,Washington <br /> February 1, 2018 Terracon Project No. 81185002 <br /> that will not perform as intended. Considering this information, several alternatives are available <br /> to mitigate the impact of heavy construction traffic on the pavement construction. These include <br /> using thicker sections to account for the construction traffic; using some method of soil <br /> stabilization to improve the support characteristics of the pavement subgrade; routing heavy <br /> construction traffic around paved areas; or delaying paving operations until as near the end of <br /> construction as is feasible. <br /> Pavement performance is affected by its surroundings. In addition to providing preventive <br /> maintenance, the civil engineer should consider the following recommendations in the design and <br /> layout of pavements: <br /> Final grade adjacent to parking lots and drives should slope down from pavement edges at a <br /> minimum 2%; <br /> The subgrade and the pavement surface should have a minimum 1/4 inch per foot slope to <br /> promote proper surface drainage; <br /> Install pavement drainage surrounding areas anticipated for frequent wetting (e.g., landscaping <br /> areas, etc.); and <br /> Install joint sealant and seal cracks immediately. <br /> 4.7.3 Estimates of Minimum Pavement Thickness <br /> The minimum pavement component thicknesses listed below should be used as a guide for <br /> pavement sections at the site for the traffic classifications stated herein. These recommendations <br /> assume a 20-year pavement design life. If pavement frequencies or loads will be different than <br /> that specified, Terracon should be contacted and allowed to review these pavement sections. <br /> The abbreviations MDD, OMC, and HMA in the following tables refer to Maximum Dry Density, <br /> Optimum Moisture Content, and Hot Mix Asphalt, respectively. <br /> MINIMUM STANDARD-DUTY PAVEMENT SECTION FOR CAR-ONLY AREAS <br /> Layer Thickness Compaction/Material <br /> (inches) Specification <br /> 95% of Modified Proctor MDD, -2 to <br /> Compacted Subgrade 24 +2% OMC <br /> Crushed Aggregate Base 4 WSDOT: 9-03.9(3) Base Course <br /> WSDOT: 9-03.8(2) %-inch HMA <br /> Asphalt Surface Course 3 <br /> WSDOT: 9-03.8(6) %-inch Aggregate <br /> Total Pavement Section 7 <br /> Responsive Resourceful Reliable 18 <br />