Specifications include, but are not limited to: 1. Geogrid Reinforced Aggregate Base. Delete Section 404.1, “Crushed Rock Base For Concrete Paver Surface”. Replace Section 404.2, “Materials”, with the following: 404.2 MATERIALS General: Materials to be used for geogrid reinforced base construction shall consist of virgin crushed stone, recycled Portland cement concrete, or a blend of recycled Portland cement concrete and Reclaimed Asphalt Pavement (RAP). This blend is not to exceed 50% RAP and shall be tested by use of an asphalt burn off oven to ensure compliance. All materials shall meet the following gradation specification. Stone/Concrete / Blended Aggregate: 1) Gradation % Retained Sieve Size (by dry weight) 2-1/2" 0 3/4" 20-60 #4 50-80 #40 80-94 #200 90-98 2) Durability Virgin base material quality shall conform to the requirements specified by the KDOT Subsection 1102 for Durability Class 1. 3) Absorption All virgin base material shall have a maximum absorption of four percent (4%). Biaxial Geogrid: The geogrid shall be a regular grid structure formed to provide tensile strength biaxially, both in the machine and cross machine directions of the grid, and shall have aperture geometry and rib and junction crosssections sufficient to permit significant mechanical interlock with the material being reinforced. The geogrid shall maintain its reinforcement and interlock capabilities under repeated dynamic loads while in service and shall also be resistant to ultraviolet degradation, to damage under normal construction practices and to all forms of biological or chemical degradation normally encountered in the material being reinforced. The geogrid shall be a single layer, non-bonded mat. A list of approved geogrids can be found on the City of Wichita website at http://www.wichita.gov/PWU/Pages/Regulations.aspx. Unless otherwise specified in the plans or project provisions, the Contractor shall be allowed to use any geogrid or geotextile fabric on the Approved Materials List, for base reinforcement. The same product shall be used throughout a project, unless approved by the Engineer prior to installation.