8417 EVERGREEN WAY Geotech Report 2022-10-25

Geotechnical Engineering Report- Revised lierracon Proposed CFT Retail Everett,Washington February 1, 2018 Terracon Project No. 81185002 MINIMUM HEAVY DUTY-PAVEMENT SECTION FOR TRUCK AREAS Layer Thickness Compaction/Material (inches) Specification 95% of Modified Proctor MDD, -2 to Compacted Subgrade 24 +2% OMC Crushed Aggregate Base 6 WSDOT: 9-03.9(3) Base Course WSDOT: 9-03.8(2) %-inch HMA Asphalt Surface Course 4 WSDOT: 9-03.8(6) %-inch Aggregate Total Pavement Section 10 The graded crushed aggregate base should be compacted to a minimum of 95 percent of the material's modified Proctor(ASTM D-1557, Method C)maximum dry density. Where base course thickness exceeds 8 inches, the material should be placed and compacted in two or more lifts of equal thickness. We recommend that a Portland cement concrete pavement(CCP) be utilized in entrance and exit sections, dumpster pads, loading dock areas, or other areas where extensive wheel maneuvering or repeated loading are expected. The dumpster pad should be large enough to support the wheels of the truck which will bear the load of the dumpster. We recommend a minimum of 6 inches of CCP underlain by 4 inches of crushed aggregate base. Although not required for structural support, the base course layer is recommended to help reduce potentials for slab curl, shrinkage cracking, and subgrade "pumping" through joints. Proper joint spacing will also be required to prevent excessive slab curling and shrinkage cracking. All joints should be sealed to prevent entry of foreign material and dowelled where necessary for load transfer. Portland cement concrete should be designed with proper air-entrainment and have a minimum compressive strength of 4,000 psi after 28 days of laboratory curing. Adequate reinforcement and number of longitudinal and transverse control joints should be placed in the rigid pavement in accordance with ACI requirements. The joints should be sealed as soon as possible (in accordance with sealant manufacturer's instructions)to minimize water infiltration into the soil. 4.7.4 Pavement Drainage Pavements should be sloped to provide rapid drainage of surface water.Water allowed to pond on or adjacent to the pavements could saturate the subgrade and contribute to premature pavement deterioration. In addition, the pavement subgrade should be graded to provide positive drainage within the crushed aggregate base section. We recommend drainage be included at the bottom of the crushed aggregate base layer at the storm structures to aid in removing water that may enter this layer. Drainage could consist of small diameter weep holes excavated around the perimeter of the storm structures. The weep holes should be excavated at the elevation of the crushed aggregate base and soil interface. The Responsive Resourceful Reliable 19