20231613 Ver 1_More Info Received_20240213

Baker, Caroline D
From: Deborah Shirley <[e-mail]>
Sent: Tuesday, February 13, 2024 5:34 PM
To: Myers, Joseph M
Cc: 'Tucker Ennis'; Jeff Roach; Phillips, George L CIV USARMY CESAW (USA)
Subject: [External] RE: Ennis Branch (Yellowbridge) - Request for additional information (DWR
#20231613) SAW-2022-00147
Attachments: 210701 IMPACT MAP-08-Impact 2.pdf, Ennis Branch - SCM 1 Post Bypass Drainage
Map.pdf, Ennis Branch - C701 Retaining Wall.pdf
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Joe:
Thank you for your review and comments. We have provided responses to the original email below in and provided
the attached additional information. We are anticipating that this will provide clarification regarding impact 2A, and will
resolve concerns of the elimination of hydrology flowing to streams C. The proposed impacts have not changed
therefore an updated PCN has not been provided.
Attarhments-
-Updated Impact Map-Dwg No 8-Impacts 2A-2E
-SCM 1-Post Bypass Drainage Map (sheet C301)
-Retaining Wall Detail -see clouded (sheet C701)
Please let us know if you have any additional questions or need further information to continue your review of this
permit application.
Thank you,
DEBORAH E. SHIRLEY
Project Manager -Regulatory Specialist
Soil & Environmental Consultants, Inc.
North Quarter Office Park
8412 Falls of Neuse Road, Suite 104
Raleigh, NC 27615
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From: Myers, Joseph M <[e-mail]>
Sent: Friday, February 2, 2024 11:35 AM

To: Deborah Shirley <[e-mail]>; Phillips, George L CIV USARMY CESAW (USA)
<George.L.Phil [e-mail]>
Subject: Ennis Branch (Yellowbridge) - Request for additional information (DWR #20231613) SAW-2022-00147
Hi Debbie,
After reviewing the application, I wanted to get clarification on the impacts relating to the potential loss of hydrology of
Stream C.
1. Impact 2A in the PCN was listed as a "crossing" but on the impact maps, 2A was listed as "lot fill". Could you
please provide clarification on what the impact is consisting of? I'm having trouble figuring out if the impact is
some sort of grading for the SCM pipe or something different.
Response: This has been adjusted to "crossing" on the impact map sheet.
2. It appears that the impacts of 2A, 213, 2C, 2D, and 2E. affect the headwaters of Stream C. Can you explain how
Stream C is able to maintain its hydrology under the current site design? The SCM drainage appears to be
directing water upstream of feature C and it is unclear how Stream C will maintain its current flow. If the impacts
are leading to a loss of stream function, I will need to request an updated PCN (table) that reflects the
permanent stream loss.
Response: After discussions with Town of Apex Water Resources staff, we have adjusted the storm system to
bypass 1.64 acres from SCM #1 to Stream V to maintain the hydrology in the area. While flow to the channel is
reduced, bypassing impervious areas through the storm systems, utilizing retaining wall weep holes, and
allowing rear lots to bypass the SCM will provide a significant amount of flow through the stream while still
providing nutrient removal and overtreatment of other areas within SCM #1 and #2. The retaining wall drains at
the bottom of the walls will also direct surface runoff from yards to Stream Vas requested by DWQ staff.
This is a request for additional information and this project will be considered on hold until the information needed
above has been provided. Please feel free to reach out with any questions you may have.
Thank you for your time,
Joe Myers
Environmental Specialist 11
North Carolina Department of Environmental Quality
Office: [phone] 1 Cell: [phone]
Joseph. Myers@deg. nc.gov
DE
NORTH CAROLINA -
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