Specifications include, but are not limited to: 1. All material must be certified to not degrade the environment nor create health hazards. 2. Aggregate must originate from a Pennsylvania Department of Transportation (PennDOT)-qualified quarry source. Quarry source must be approved for the production of C2A, as listed in PennDOT Bulletin 14. 3. Wearing course material must be structurally durable so that weathering and traffic loads do not result in the creation of dust, sediment, or pollution. 4. All driving surface aggregate is to be derived from natural stone formations. a) Stone is defined as rock that has been crushed; rock is defined as consolidated mineral matter. b) For use in this program, both are restricted to that which has been mined or quarried from existing geologic bedrock formations.