Hennepin County

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PROJECT QUESTION: The ‘typical median section’ detail shows the finish grade in medians being crowned at 8%. This would require adding soil within the driplines of and on top of the roots of trees in the median, which would be detrimental to their health. Please confirm that the county is requiring this crowning despite its potential for harm to the existing trees.

Question: The ‘typical median section’ detail shows the finish grade in medians being crowned at 8%. This would require adding soil within the driplines of and on top of the roots of trees in the median, which would be detrimental to their health. Please confirm that the county is requiring this crowning despite its potential for harm to the existing trees.

Response: Median crowning will not occur within existing tree driplines. When approaching a tree, taper the crown at approximately 3:1 to the dripline existing finish grade. No soil amendments or topsoil shall be added within the tree driplines. For smaller trees, the dripline shall be a minimum of a 5’ radius surrounding the tree.

The typical median section is found on page R47.1 of Addendum 1. Additional notes were added to this sheet to reflect the intent of the ‘crowned median’.