Four changes have been drafted to be included in practice standard 1004, Bioretention. A brief explanation of the changes are as follows:
- V.B.5.a.(3) – Specify a planting density of one foot on center. Dane County recommended this change, because consultants were trying to save money by spacing the plants too far apart.
- V.B.5.b. – Allow Class II erosion control mats to be substituted for shredded hardwood mulch or chips. Dane County recommended this change, because the wood chips float away when submerged.
- V.B.6.d.(5) – Increase the acceptable pH range of the soil mix from between 5.5 and 6.5 to between 5.5 and 8.0. Jame (Sandy) Syburg with Purple Cow Organics, LLC in Oconomowoc, WI suggested the pH change.
- V.B.6.c. – Decrease the depth of the engineered soil mix from 3 feet to 2 feet. This change was prompted by the results of research conducted in Neenah, WI by the Department and our many partners, such as the USGS and McMahon Engineers and Architects.
The justification for these four changes is outlined in the rest of the memo below.
If you have questions regarding the revisions of these practice standards, please contact Roger Bannerman at firstname.lastname@example.org.
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