HomeMy WebLinkAboutMP-24-03 - Supplemental - 0850 Hinesburg Road (32)850 Hinesburg Road Stormwater Division Comments
❹❶6.Hinesburg.Road.Master.Plan.Comments¿
1. The response to the requirements of 15.B.05.6.c states that “The infrastructure
requirements are either readily available or will primarily be accommodated in the first
phase of the project.” The proposed gravel wetland looks to be the only proposed
stormwater treatment accounted for in the Master Plan. Please note that all new impervious
will need to receive treatment from a stormwater treatment practice that conforms with the
standards laid out in section 13.05 of the LDRs.
❹❶6.Hinesburg.Road.Phase.I.Preliminary.Plat.Comments¿
1. Please provide the HydroCAD model for review. Also please note that the HydroCAD print-
outs included in the application do not include any routing from the drainage areas to the
gravel wetland and therefore do not provide any information on how the gravel wetland will
perform during any storm event.
2. Sheet SW-1:
a. How will the applicant ensure that all runoff from the road enters the gravel wetland
system through the pre-treatment forebay? Note in particular that runoff from the
hammerhead will be able to flow freely into the gravel wetland without receiving pre-
treatment.
b. This is quite a steep road. How will the applicant prevent runoff from the south side
of the road from scouring the adjacent land and causing erosion issues? Staff
recommends the inclusion of a stone-lined swale on the south side in addition to
the one on the north.
c. Grading is insufficient to determine routing of runoff from the proposed driveways
and buildings. How will the applicant ensure that all runoff from the driveways and
homes makes it into the gravel wetland system?
d. Staff recommends increasing the size of the driveway culverts from 12” to 15”.