RPBCWD Permit Application 2016-001 9641 Meadowlark Lane ChanhassenDan,
The RPBCWD received an application for the Vogel waterbody crossing at 9641 Meadowlark Lane in Chanhassen.
The application has been assigned permit number 2016-001. The application is currently considered incomplete. The application will be considered incomplete until the following information
is received:
1. Erosion control plan including:
a. Location of all temporary erosion and sediment control measures
b. Identification of all permanent erosion control and soil stabilization measures
c. Identification of staging areas, as applicable
2. Wetland delineation report
3. Edge of proposed buffer and computations for any buffer averaging showing how the proposed buffer meets the required buffer area
4. Buffer marker detail
5. Construction plans and specifications for the proposed culvert certified by a registered professional engineer
6. Analysis prepared by a professional engineer or qualified hydrologist showing the effect of the project on hydraulic capacity and water quality
A preliminary review of the submitted information has generated the following questions or comments. Many of these items will need to be addressed before a recommendation can be made
to the RPBCWD Board to approve the permit.
Plans must clearly indicate what portions of the work will be included in this phase of the work. The submitted figure appears to indicate a portion of the driveway will be constructed
when installing the culvert. Submitted plans must be consistent with the disturbed area and volume computations indicated on the application form to determine rule applicability.
To fully conform to the RPBCWD Rule C the following revisions are needed:
C1. Location of all temporary erosion and sediment control measures must be shown on the plans (see attached for an example erosion control plan).
C2. The erosion control plan must include the following information:
a. Natural topography and soil conditions must be protected including retention onsite of native topsoil to the greatest extent possible.
b. Final site stabilization measures must specify that at least six inches of topsoil or organic matter be spread and incorporated into the underlying soil during final site treatment
wherever topsoil has been removed.
c. Construction site waste such as discarded building materials, concrete truck washout, chemicals, litter and sanitary waste must be properly managed.
d. All temporary erosion and sediment control BMPs must be maintained until completion of construction and vegetation is established sufficiently to ensure stability of the site,
as determined by the District.
e. All temporary erosion and sediment control BMPs must be removed upon final stabilization.
f. Soil surfaces compacted during construction and remaining pervious upon completion of construction must be decompacted through soil amendment and/or ripping to a depth of 8
inches while taking care to avoid utilities, tree roots and other existing vegetation prior to final revegetation or other stabilization.
g. All disturbed areas must be stabilized within 7 calendar days after land-disturbing work has temporarily or permanently ceased.
h. The permittee must, at a minimum, inspect, maintain and repair all disturbed surfaces and all erosion and sediment control facilities and soil stabilization measures every day
work is performed on the site and at least weekly until land-disturbing activity has ceased. Thereafter, the permittee must perform these responsibilities at least weekly until vegetative
cover is established.
To fully conform to the RPBCWD Rule D the following revisions are needed:
D1. A copy of the wetland delineation report must be provided for review.
D2. The edge of the proposed buffer must be shown on the plans (in addition to the buffer marker locations).
D3. Computations demonstrating any buffer averaging used must be shown on the plans.
D4. The waterbody along the western edge of the property is Riley Creek. Because the proposed culvert discharges to Riley Creek, buffer must be created along the entire downgradient
length of Riley Creek on the property. A buffer with an average of 20 feet from the ordinary high water elevation of the creek, minimum 10 feet is required.
D5. The wetland boundary shown on the plans indicates one continuous wetland in the driveway area, along the western side of the property, and along Lake Riley. Buffer must be created
on the entire wetland because it is downgradient of the proposed work. Wetland buffer for a single family home must extend 20 feet from the delineated edge of a wetland, minimum 10
feet.
D6. A detail for the buffer markers must be shown on the plans. An example detail is available for download from the RPBCWD website (www.rpbcwd.org/permits).
D7. The invert of the culvert must be shown on the plans. The culvert should be placed to minimize the potential for erosion within the wetland.
D8. A note must be added to the plans indicating: The potential transfer of aquatic invasive species (e.g., zebra mussels, Eurasian watermilfoil, etc.) must be minimized to the maximum
extent possible.
D9. Before any work subject to District permit requirements commences, buffer areas and maintenance requirements must be documented in a declaration and recorded in the office of the
county recorder or registrar.
To fully conform to the RPBCWD Rule G the following revisions are needed:
G1. Construction plans and specifications for the proposed culvert, certified by a registered professional engineer, must be provided.
G2. An analysis prepared by a professional engineer or qualified hydrologist showing the effect of the project on hydraulic capacity and water quality must be provided.
G3. The inverts of the proposed culvert must be shown on the plans.
G4. The material of the proposed culvert must be shown on the plans.
G5. The design of the culvert must retain adequate hydraulic capacity and assure no net increase in the flood stage of the waterbody.
G6. The design of the culvert must not adversely affect water quality, change the existing flowline/gradient, or cause increased scour, erosion or sedimentation.
G7. The design of the culvert must represent the ‘minimal impact’ solution to a specific need with respect to all other reasonable alternatives.
G8. Banks must be stabilized immediately after completion of permitted work and revegetated as soon as growing conditions allow.
G9. A note must be added to the plans indicating: The potential transfer of aquatic invasive species (e.g., zebra mussels, Eurasian watermilfoil, etc.) must be minimized to the maximum
extent possible.
G10. Stabilization practices at the inlet and outlet of the culvert must be consistent with the erosion intensity calculated for the site.
G11. The finished, stabilized slope will not be steeper than 3:1 (horizontal to vertical).
A permit under Rule J may be required for this portion of the work. Based on the area of disturbance shown on the plans and the described work, it appears there may be more than 50 cubic
yards of cut or fill associated with the project. Computations documenting the amount of cut and fill associated with the project must be provided (the requirement is not based on the
amount of net cut or fill, but the amount of total cut and/or fill).
Review of the additional materials may result in additional comments that will need to be addressed prior to issuing a permit. We will do everything we can to ensure that we move you
through the permitting process as quickly as possible. Please contact me with any questions or concerns about this initial review.
Thank you,
Candice M. Kantor, PE
Water Resources Engineer
Minneapolis, MN office: 952.832.2868
cell: 989.289.3048
ckantor@barr.com
www.barr.com