20221447 Ver 1_More Info Received_20230223

MCADAMS RESPONSE TO COMMENTS > LEN22002
February 23, 2023
Ms. Sue Homewood
401 & Buffer Permitting Branch
Division of Water Resources
217 West Jones Street
Raleigh, North Carolina 27603
RE: Veridea
Response to NCDWR Comments
CRC-14010
The following are the response comments for the above -mentioned project. Our response comments are in bold.
DIVISON OF WATER RESOURCES
Sue Homewood [e-mail]
1. With regards to the Division's concerns about maintaining hydrology within streams and wetlands retained
within the project I have identified areas that remain a concern. It appears that the information provided only
addressed the larger stream channels. I do not see any information provided on how the following streams and
wetlands will maintain hydrology:
Note: West Village — in gist; we really don't have West Village 100% vetted at this point. The layout is
30% at best; still very conceptual. So the concern about short circuiting and hydrologically drying up the
stream features on this side of the site are easily addressed. To help with this we have included a PDF
response to this in the subsequent pages and responses below.
> Stream E and it's adjacent wetlands.
McAdams Response: Stream E (and the existing Ponds at the headwaters there): we don't show any
SCM's given that West Village & South Village for that matter too, are very much conceptual at this point
— however, we will surely plan the design around keeping flow to those existing ponds and this stream
start point as shown. Refer to Sheet 3 of the attached response showing the Veridea West Village overall.
Although conceptual, the SCM preliminary locations should adequately address this concern, and this
should not be an issue as we get into the West Village planning in the future. Following the plan we have
had subsequent discussions with Robert Patterson, PE (Town of Apex Town Stormwater Engineer) to
discuss practices during construction drawing design and SWM planning that we can achieve charging the
hydrology in these features. He agreed that we can use similar tools to the NCDOT discharge tool box,
and get stormwater from impervious to these upper reaches to meet this goal is not from a direct primary
SCM. During the SIA master plan we will analyze for this as well as keeping the overall point of analyses
creating experiences through experience 2905 Meridian Parkway, Durham, NC 27713 / 919. 361. 5000

MCADAMS RESPONSE TO COMMENTS > CRC-14010
for Veridea to adhere to our overall committed 100-year detention goals, and also to achieve our nutrient
removal strategy.
> Wetland F, Wetland G, and Stream F
McAdams Response: Stream F (and the wetland G & F at the headwater): this is an identical scenario to
Stream Feature "E" above — we just don't have that detail yet to prove the hydrological charging of the
headwater. We can confirm that this will be taken into full consideration with the final layout/design and
SCM's will be placed appropriately to assure we do not inadvertently dry the features out.
> Stream I.
McAdams Response: Stream I: Same as "E" and "F" above, I think we can place SCM's appropriately as
illustrated to abate this concern.
> Wetland R and the upper portion of Stream K.
McAdams Response: Stream K (and wetland R): this is where we have planned the regional active
recreation space for Veridea. I do not foresee placing SCM's at the wetland headwater/start point being
of concern as we get into the master plan/facility arrangement there.
Note: East Village - The only comment from the comment list is Stream DD, but the redline alluded to in the
bottom paragraph has a few other features, so we included responses to that redline here, below too. Refer
to the PDF Sheet 2 for an illustration of the responses below.
> Stream DD.
McAdams Response:
Stream DD: we do divert a decent amount of base flow from the main Stream DD and the upper (northern
spur) Stream CC feature. To address this, as stated in response to Stream E above, we spoke with Robert
Patterson, and we're okay at time of CD's bypassing a certain amount of impervious to do a point
discharge with a level spreader to the stream. We will still achieve post development hydraulic pre/post
detention and overall nutrient treatment requirements. This small amount of impervious should address
the concern over hydrological short circuiting and drying out of stream CC and DD as shown. I sketched
areas in pink/green that this would likely occur.
Stream GG: similar to DD above, we can plan to add more impervious bypass to keep that headwater
charged with baseflow.
Stream II: there exists upstream undeveloped areas that flow to this smaller feature. I illustrated
that. Another method to keep that feature hydrologically sound is to move the SCM outlet point more
northerly as I have illustrated. I believe this should address the concern there.
creating experiences through experience 2 of 3

MCADAMS RESPONSE TO COMMENTS > CRC-14010
2. In addition, I've attached a page from your response that shows areas where SCMs are draining to channels
however the exact outlet is not shown and the arrows point to lower down on the channel (areas in purple
bubbles). I have concerns that these areas are solely depending on recharge from the SCM and the upper
portions of the channels may lose hydrology above the point of recharge.
McAdams Response: Refer to Sheet 2 of the ensuing pages showing the areas tributary referenced above.
Consideration of this response is greatly appreciated. If you should have any questions or require additional
information, please do not hesitate to contact me at 919. 361. 5000.
Sincerely,
MCADAMS
Ryan Akers
Feb 23 2023 5:20 PM
Ryan Akers, PE, LEED® AP
Group Manager
RA/mp
creating experiences through experience 3 of 3

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The John R. McAdams Company, Inc.
2905 Meridian Parkway
Durham, NC 27713
phone [phone]
fax [phone]
license number: C-0293, C-187
www.mcadamsco.com
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PLAN INFORMATION
PROJECT NO. LEN-22002
FILENAME
CHECKED BY
DRAWN BY BIJ
SCALE 1"=150'
DATE 06.21.2022