Specifications include, but are not limited to: . Contractor shall install a flexible porous pavement trail on top of the path prepped by park staff for paving. a. Trail must be a minimum of 1.5 miles (7920 feet) long. b. Trail shall be 60 inches wide. c. Trail must be a minimum of 1.5 inches thick installed over gravel base. d. Trail must have a beveled edge. e. Trail surfacing must be porous to water, with a minimum of 2,250 gallons per hour per square foot. f. Trail surfacing must have at least 20% inner void space. g. Trail surfacing must be slip resistant, meeting ASTM D-2047 slip resistant test. h. Trail surfacing will be flexible and resistant to cracking and heaving due to normal environmental conditions. i. Trail surfacing must have a minimum of NFPA Class āCā fire rating. j. Trail surfacing must be resistant to UV rays, oil, fuel (including gasoline and diesel), transmission fluid, hydraulic fluid, and other common commercial chemicals.