Section 670-7-1-8 - DESIGN, CONSTRUCTION & MAINTENANCE1. All projects shall comply with the Bureau's Best Management Practice (BMP) Guidelines for the maintenance or construction of trails and the Snowmobile Trail Signing Guidelines for sign placement.2. Any deviation from these guidelines shall be described in the application. The Bureau may waive the applicability of certain guidelines on a case-by-case basis, when it is in the best interest of the State. Waivers must be in writing.3. Best management practices for the construction and maintenance of snowmobile trails include the following: (1) A minimum width of 8';(2) Brush cleared at least 1' from the outer edge of the trail;(3) Brush cleared at least 8' above the trail corridor;(4) Sustained grades and slopes of the trail shall not exceed 30%;(5) All directional signs used shall be provided by the State. Alternatives of equal size, shape, color and material that are approved by the State in accordance with the Snowmobile Trail Signing Guidelines may also be used.(6) Trail grooming at least twice per week or more often if necessary depending upon weather and traffic.01- 670 C.M.R. ch. 7, § 1-8