Specifications include, but are not limited to: Road Gravel (river gravel, pit-run) to be 1 ½ inches maximum size with at least 20% to be 1 inch to 1 ½ inches in size. Pure sand is not acceptable. SS5, 1” Road Rock, per section 1113 KDOT standard specifications Crushed limestone can be from local, country quarries, 3 inch maximum size with at least 20% to be 1 inch to 1 ½ inches in size. Mudball is a mix of 2 ½ to ½ inch rock with 15-20% clay and mud mixed in. Rip Rap, rock will have a minimum diameter of 12”. This rock may be ordered at any size up to 36” diameter. Rock must be free from earth, soapstone, shale, shale like or other easily disintegrated material that decrease the durability of the material after placement.