Specifications include, but are not limited to: Annual Erosion Control Materials. Erosion control blanket shall be a machine-produced mat consisting of 70% agricultural straw and 30% coconut fiber. The blanket shall be of consistent thickness with the straw and coconut fiber evenly distributed over the entire area of the mat. The blanket shall be covered on the top side with heavyweight photodegradable polypropylene netting having ultraviolet additives to delay breakdown and an appropriate 5/8 inch (1.6 cm) x 5/8 inch (1.6cm) mesh, and on the bottom side with a lightweight photodegradable polypropylene netting with an approximate 1/2 inch (1.3 cm) x 1/2 inch (1.3cm) mesh. The blanket shall be sewn together on 1.5 inch (3.8cm) centers with degradable thread.