20200349 Ver 3_9a_BlueRidgeRoad NCDWR RFI_20200317_20220823

NCDWR RFI (March 17, 2020)
Response

Richards, Mackenzie
From: Richards, Mackenzie
Sent: Tuesday, March 24, 2020 9:55 AM
To: Ridings, Rob
Subject: RE: Blue Ridge Road (SR 1670) City of Raleigh. DWR# 20200349
Attachments: Storm Drain_System_AII_InletRpt.pdf, Storm Drain_System_AII_StormRpt.pdf,
Redline-Blue Ridge.pdf
Rob,
I am going to give you a call this morning to talk through your concerns. I have attached hydrology drainage plans, an
inlet computation sheet, and storm drain design computations to provide more information for the stormwater plan for
the project.
Thank you for your time!
Mackenzie Richards
Kimley-Horn 1 421 Fayetteville Street, Suite 600, Raleigh, NC 27601
Direct: 919 678 4154 1 Mobile:[phone]
Connect with us:Twitter I Linkedln I Facebook I Instagram I Kimley-Horn.com
Celebrating 13 years as one of FORTUNE's 100 Best Companies to Work For
From: Ridings, Rob<[e-mail]>
Sent:Tuesday, March 17, 2020 11:10 AM
To: Richards, Mackenzie<[e-mail]>
Subject: Blue Ridge Road (SR 1670) City of Raleigh. DWR#20200349
Mackenzie,
I'm reviewing the 401/Buffer Application for City of Raleigh's Blue Ridge Road project. Most everything looks
good, except for the section of the PCN for stormwater. It seems to leave me with a good few questions. It
may be because you all attached the S&E plans as your stormwater plan, which is quite unusual for
transportation projects. Normally we prefer that with the Permit Drawings, but I'm attempting to make sense
of them.
For starters, it mentions two retention ponds for treatment. I've only found one, on page 20 at the Noremac
intersection. Could you point me to the other?
Secondly, it mentions: "Treated stormwater will discharge through a riprap pad at the bottom of the fill
slope....etc". I'm not sure how this is "treated" as the permit drawings appear that this water is going into
curb &gutter and discharging directly into the creek at three points (two at the culvert and one at the parrallel
section). Can you clarify?
(If easier to describe via phone, I'm working from home this week and you can call me there: 919-791-8716.)
Thanks,
Rob Ridings
Environmental Specialist
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401/Buffer Transportation Permitting (DOT Divisions 4-5)
Division of Water Resources, NC Department of Environmental Quality
919-707-3873 office
rob.ridings(a)ncdenr.gov
512 North Salisbury Street, 12t" Floor
1617 Mail Service Center
Raleigh, NC 27699
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