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MNDOT Type 6 Chips


MNDOT Type 6 Mulch*

“Provide Type 6 mulch with the following characteristics:

  1. (1)  Raw wood material from hard or soft timber and that is the product of a mechanical chipper, hammermill, or tub


  2. (2)  Material is free of mold, dirt, sawdust, and deleterious material;

  3. (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. (4)  Material is air dried;

  5. (5)  Do not allow unattached bark, green-leaf composition to exceed 20 percent by mass;

  6. (6)  Maximum length of individual pieces shall not to exceed 12 in [300 mm]; and

  7. (7)  Maximum width of individual pieces shall not to 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. “