HomeMy WebLinkAbout2022-09-30 MNDOT Ltr Re Stormwater Calculations DEPARTMENT OF Metropolitan District
Intl1500 County Road B-2 West
TRANSPORTATION Roseville, MN 55113
September 30, 2022
Scott Richards, City Planner
City of Oak Park Heights
14168 Oak Park Blvd
Oak Park Heights. MN 55082
SUBJECT: St. Croix Car Wash
MnDOT Review #S22-030
SW quad of 60th St.N and Omaha Ave. N.
City of Oak Park Heights, Washington County
Dear Scott Richards,
The Minnesota Department of Transportation (MnDOT) has reviewed the documents for the
above-referenced development received 9/12/22 and has the following comments:
Water Resources
MnDOT Metro Water Resources does not agree with the stormwater calculations as presented.
Specifically, the analysis reroutes approximately two-thirds of the future site runoff in a new
direction and assumes that the MnDOT stormwater connection will be adequate. Therefore,the
stormwater analysis must be corrected.
A MnDOT drainage permit is required before development occurs. The permit applicant shall
demonstrate that the off-site runoff entering MnDOT drainage system(s) and/or right of way will
not increase. The drainage permit application, including the information below, should be
submitted online to: htt,p' olpa.c ot.state.mn u ,'OI i' . Please upload this letter with the
drainage permit application.
The following information must be submitted with the drainage permit application:
1. Grading plans, drainage plans, and hydraulic calculations demonstrating that proposed
flows to MnDOT right of way remain the same as existing conditions or are reduced.
2. Existing and proposed drainage area maps with flow arrows and labeling that corresponds
with the submitted calculations.
3. Hydro CAD model and PDF of output for the 2, 10, and 100-year Atlas 14 storm events.
Once a drainage permit application is submitted, a thorough review will be completed and
additional information may be requested. Please contact Jason Swenson, Water Resources
Engineering, at 651-234-7539 or on.sx‘enson;a state.mnuis with related questions.
Permits
As previously stated, a drainage permit is required. Any other work that affects MnDOT right of
way will also require an appropriate permit. All permits are available and should be submitted at:
� t_ps olp< .cioLstate.mn us;'01 k'\i. Please upload this letter when applying for any permits.
Page 1 of 2
For questions regarding permit submittal requirements, please contact Buck Craig of MnDOT's
Metro District Permits Section at 651-775-0405 (cell)or hua.craig1 statesnnws.
Review Submittal Options
MnDOT's goal is to complete reviews within 30 calendar days. Review materials received
electronically can be processed more rapidly. Do not submit files via a cloud service or
SharePoint link. In order of preference, review materials may be submitted as:
1. Email documents and plans in PDF format to mctrocic:vrev iev,sAorr.s#ate.nuLtis.
Attachments may not exceed 20 megabytes per email. Documents can be zipped as well.
If multiple emails are necessary, number each message.
2. For files over 20 megabytes, upload the PDF file(s)to MnDOT's Web Transfer Client
site: hits: lt.dot.state.mm11.us. Contact MnDOT Planning development review staff
using the same email above for uploading instructions, and send an email listing the file
name(s) after the document(s) has/have been uploaded.
You are welcome to contact me at 651-234-7723, or laith.xionec/state.mn.us with any questions.
Sincerely,
Faith Xiong D tie 202 09 0122438-0500'
Faith Xiong
Principal Planner
Copy sent via email:
Jason Swenson, Water Resources Ryan Coddington, Area Engineer
Buck Craig, Permits Lance Schowalter, Design
Mike Lynch, Right of Way Mike Samuelson, Ped/Bike Planning
Kaare Festvog, Traffic Bethany Brandt-Sargent, Metropolitan Council
Alex Hogan, Traffic Jed Hanson, Metropolitan Council
Kimberly Zlimen, Transit Amanda Berndt, Duan Corporation
Adam Josephson, Area Manager
Page 2 of 2