20171523 Ver 1_More Info Requested_20180212

Strickland, Bev
From:
Mcdaniel, Chonticha
Sent:
Monday, February 12, 2018 2:37 PM
To:
Keith Rains
Cc:
Homewood, Sue
Subject:
RE: [External] Uwharrie Middle School
Keith,
While the rip -rap apron design may provide outlet protection, the calculations do not show how those discharge points
will not impact the receiving stream (especially when some of them are shown to go directly into the stream). A
comparison between the current size/condition of the receiving stream and the proposed discharge volume/velocity
from each discharging point (after the rip -rap apron), should be provided in the calculations to ensure the structural
stability of the stream.
Also, will there be any vegetated strip or conveyance at the site at all?
Chonticha McDaniel
401 Stormwater Engineer
401 & Buffer Permitting Branch
Division of Water Resources
Department of Environmental Quality
919-807-6379 office
chonticha.mcdaniela-ncdenr.gov
Mailing Address - 1617 Mail Service Center, Raleigh, North Carolina, 27699-1617
Street Address - 512 N. Salisbury St, Raleigh, North Carolina, 27604
Nothing Compares
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Keith Rains [mailto:[e-mail]]
Sent: Friday, February 09, 2018 10:44 AM
To: Mcdaniel, Chonticha <[e-mail]>
Subject: RE: [External] Uwharrie Middle School
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Ms. McDaniel:
Please see below and the attached. Please don't hesitate to email me any questions or if anything additionally is needed.
See below for my responses in red.
Keith Rains, PE

President
803-493-5393
From: Mcdaniel, Chonticha [mailto:[e-mail]]
Sent: Thursday, January 25, 2018 12:04 PM
To: Keith Rains <[e-mail]>
Cc: Homewood, Sue <[e-mail]>
Subject: RE: [External] Uwharrie Middle School
Keith,
Please provide the following items to document that the project will not cause degradation of downstream surface
waters:
1) Delineation of each drainage area and accompanying calculations to show that flows from every discharge point
will be non-erosive to both the land surface and the receiving surface water during the peak flow from the 10 -
year storm event. I have provided the drainage area map and storm clacs for the 10 -year event.
2) Calculations to demonstrate that for any discharge points proposed to increase flow rates and volume, the
structural stability of the receiving surface water will not be compromised. I have provided on the plan and the
calcs showing the sizing of rip -rap aprons to reduce the velocities per the state's requirements.
3) Designed drawings (both aerial and profile views showing the actual designed dimensions) and calculations of
any proposed detention system (i.e. level spreaders). Any vegetated conveyances should also be depicted on the
drawings. Added the detail for the level spreader sizing utilizing the state's requirements for an outfall that is
not utilizing rip -rap aprons for velocity reductions.
Let me know if you have more questions. Thank you!
Chonticha McDaniel
401 Stormwater Engineer
401 & Buffer Permitting Branch
Division of Water Resources
Department of Environmental Quality
919-807-6379 office
chonticha.mcdaniel(o)ncdenr.gov
Mailing Address - 1617 Mail Service Center, Raleigh, North Carolina, 27699-1617
Street Address - 512 N. Salisbury St, Raleigh, North Carolina, 27604
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Keith Rains [mailto:[e-mail]]
Sent: Thursday, January 25, 2018 11:20 AM
To: Mcdaniel, Chonticha <[e-mail]>
Subject: [External] Uwharrie Middle School

CAUTION: External email. Do not click links or open attachments unless verified. Send all suspicious email as an attachment to
[e-mail].
Ms. McDaniel:
Got your call. I will be more than happy to provide whatever is needed to show that this site qualifies as a Low Impact
Development. I just need more specifics about what you are looking for. It is difficult to decipher when the regulations
are so broad. Thanks.
Keith Rains, PE
President
803-493-5393