Specifications include, but are not limited to: Material to be used shall consist of North American hardwoods such as Oak, Maple, Ash, Poplar, Hickory, Beech, Birch, Elm, and Locust. All woods shall have been debarked and free of soil, leaves and twig material and other contaminates which hasten decomposition. No chemical treatment or additives are present. Must meet ASTM F 1292 requirements. Positively no recycled wood from pallets or waste wood is to be used due to the possibility of contamination and the risk of poor surface stability. Dimensions: Wood Playground Mulch used shall be randomly sized, approximately ten (10) times longer than wide. Wood Playground Mulch used shall meet the graduation requirements of ASTM C 136: The method for Sieve Analysis of Fine and Coarse Aggregates (1984a) Percent Passing Sieve Size Passing by Weight, % 3/4 in. 100 3/8 in. 98 No. 4 80 No. 10 42 No. 60 3 No. 200 .5