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• <br /> • nNFELOER <br /> • <br /> • <br /> and the construction joints and sealing them with a petroleum resistant flexible sealant. For <br /> areas of joint spalls, we recommend sawcutting along both sides of the joint, removing the <br /> r• damaged and loose material and filing with a petroleum resistant elastic joint filler in accordance <br /> • with the manufacturer's instructions. <br /> New PCC pavement for van parking/loading areas should be comprised of 6.0 inches of <br /> concrete pavement over 6.0 inches of aggregate base. Longitudinal and transverse joint <br /> spacing for concrete pavements should not exceed 12 feet and 15 feet, respectively. Joint <br /> • details should conform to PCA guidelines. Expansion joints in concrete slabs should be sealed <br /> • with petroleum resistant sealant to prevent minor releases from impacting subsurface soil. <br /> • <br /> 4.4.5 Aggregate Base <br /> • <br /> Aggregate base materials should be free-draining granular material and meet the specifications <br /> • in Section 9-03.9(3) Crushed Surfacing of the Washington State Department of Transportation <br /> (WSDOT) Standard Specifications for Road, Bridge, and Municipal Construction (2020). <br /> S <br /> 4.4.6 Construction Considerations <br /> • <br /> • The pavement sections provided above are contingent on the following recommendations being <br /> �► implemented during construction. <br /> • <br /> 411 • The subgrade should be prepared in accordance with the recommendations in <br /> Section 4.5.2. <br /> • <br /> • Aggregate base should be compacted to at least 95 percent of the soil's maximum dry <br /> unit weight as determined by Modified Proctor (ASTM D1557). Moisture content should <br /> • <br /> be maintained within one or two percentage points of optimum during compaction. <br /> 411 <br /> • • Subgrade soils should be in a stable, non-pumping condition at the time the aggregate <br /> base materials are placed and compacted. <br /> S • Asphalt paving materials and placement methods should meet current applicable code <br /> • specifications. <br /> • • Adequate drainage (both surface and subsurface) should be provided such that the <br /> • <br /> • subgrade soils and aggregate base materials are not allowed to become wet. <br /> • <br /> • 20203884.001A/SEA20R110164 Page 17 of 28 June 1, 2020 <br /> ©2020 Kleinfelder <br /> • <br /> • <br />