6617 ASSOCIATED BLVD AMAZON Geotech Report 2022-10-25

• • nKLEINFELDER • �ia+mn • • Version 1.4, dated 03 March 2020. Based on the current truck routes proposed at the project • site, it is not necessary to construct areas only subjected to delivery vans to same heavy-duty • traffic loading as the truck routes. Accordingly, we have provided a medium-duty pavement • section for areas subjected to traffic loads from delivery vans only. • • Further discussions of our recommendations are presented below. Subgrade preparation • recommendations are provided in Section 4.5.2. • • 4.4.2 Proposed Truck Routes (Heavy-Duty Pavement) • • As discussed above, the current asphalt pavement sections are not adequate for heavy-duty • traffic loading and we recommend full-depth reconstruction of the pavement sections for • heavy-duty truck traffic. We have based our pavement design for heavy-duty pavement based • on 200 trucks per day with a typical weight of 75,000 pounds and 15-year design life. New • asphalt pavement sections in heavy-duty traffic areas should consist of 6.0 inches of Hot Mix • Asphalt (HMA) over 8.0 inches of Aggregate Base (AB) or 5.0 inches HMA over 12.0 inches of • AB. Both options are estimated to have a design life of approximately 15 years. • • 4.4.3 Proposed Delivery Van Routes (Medium-Duty Pavement) • • Pavements subjected to traffic loads from delivery vans may be designed for a medium-duty • pavement section. We recommend that new AC pavement sections in medium-duty traffic areas • consist of 4.0 inches of AC over 6.0 inches of AB. As discussed above, the existing AC pavement sections are relatively thin and not considered adequate for the proposed delivery vans and we recommend full-depth reconstruction. As an alternative to full-depth reconstruction, the existing AC pavement section could be left in place. • However, due to the increased traffic from delivery vans, the pavement in this area will likely • deteriorate faster than its design life and we recommend that frequent inspection be performed and increased maintenance (crack sealing, structural overlays, etc.) should be anticipated to • extend the life of the pavement. • ID 4.4.4 PCC Pavement for Van Parking/Loading Area • • The existing PCC pavement east of the warehouse has a PASER rating of 8 and is in good • condition. We recommended preventive maintenance consisting of cleaning any existing cracks • 20203884.001A/SEA20R110164 Page 16 of 28 June 1, 2020 • ©2020 Kleinfelder •