MNDOT Spec Wood Mulches:
MNDOT Type 5 Mulch*
"Provide Type 5 mulch with the following characteristics:
(1) Raw wood slash from hard or soft timber harvested during clearing and grubbing operations on the project;
(2) Product of a mechanical chipper, hammermill, or tub grinder;
(3) Maximum length of individual pieces shall not to exceed 20 in [500mm], and.
(4) Maximum width of individual pieces shall not exceed 2 in [50mm]. "
"Provide mulch from a supplier outside of the Emerald Ash Borer quarantine areas or, if the mulch originates from within the quarantine areas, obtain a Compliance Agreement with the MDA. The Department will not allow mulch transported in or through a quarantine area to be transported outside the Emerald Ash Borer quarantine area without approval from the MDA. Find the quarantine area by contacting the MDA at 1-888-545- 6684 or visit the MDA Emerald Ash Borer website."
MNDOT Type 6 Mulch*
"Provide Type 6 mulch with the following characteristics:
(1) Raw wood Material from hard or soft timber and that is the product of a mechanical
chipper, hammermill, or tub grinder
(2) Material is free of mold, dirt, sawdust, and deleterious Material
(3) Do not use wood Material in an advanced state of decomposition, chipped-up
manufactured boards or chemically treated wood; including wafer board, particle board,
Chromated Copper Arsenate (CCA), or penta-treated wood
(4) Material is air dried
(5) Do not allow unattached bark, green-leaf composition to exceed 20 percent by mass
(6) Maximum length of individual pieces shall not exceed 12 inches
(7) Maximum width of individual pieces shall not exceed 2 inches
"Provide mulch from a supplier outside of the Emerald Ash Borer quarantine areas or, if the mulch originates from within the quarantine areas, obtain a Compliance Agreement with the MDA. The Department will not allow mulch transported in or through a quarantine area to be transported outside the Emerald Ash Borer quarantine area without approval from the MDA. Find the quarantine area by contacting the MDA at 1-888-545- 6684 or visit the MDA Emerald Ash Borer website. "
*Source: https://edocs-public.dot.state.mn.us/edocs_public/DMResultSet/download?docId=38774551 Pgs : 1037-1038