20211512 Ver 1_More Info Received_20211217

Strickland, Bev
From: Kevin Martin <[e-mail]>
Sent: Friday, December 17, 2021 10:16 AM
To: Cohn, Colleen M
Cc: [e-mail]
Subject: [External] RE: Legacy Subdivision
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Colleen, the engineers response to you first two questions are below in red after your
questions. Have a fun weekend.
1) It appears that the impacts listed for Road Crossing #2 are greater than those previously approved under DWR#
20180191 on March 22, 2018. Please provide additional details concerning avoidance and minimization for this
road crossing, including additional information on why this project requires additional impacts. [15A NCAC 02H
.0506(b)(1)] The 2018 design wasn't acceptable by NCDOT (Scott Wheeler), the wall material proposed by the
client wasn't acceptable due to the height of the crossing. As a result of that, we had to change the design to
the current version to satisfy NCDOT. In the current version, the NCDOT allowed a reduction on K-values to
"Rolling" due to height of the crossing and suggested we grade the embankment and put head walls at the
bottom.( The NCDOT has a has a manual of "Minimum Construction Standards for Subdivision Roads". In the
Manual dictates various design elements, road radius, vertical curve design, etc. The vertical curve design in
broken up into three categories....Level, Rolling & Mountainous, each one of the categories have different
minimum K values for vertical curves values. The best way to explain the K-value is the tightness of driving over
a hill or sag in a road. Legacy is in Level Terrain, but NCDOT allowed us to Rolling Terrain on the crossing to help
reduce the impacts.) Even with the DOT allowances, the new design disturbed more buffers and stream
channel. We also added 9 linear feet of temporary stream impact on the high side of the culvert between the
culvert and the coffer dam to allow adequate construction access for installation of the headwalls.
Impact
Previously Approved
Requested
Road Crossing # 2- Culvert
82 (linear feet)
113 (linear feet)
Road Crossing #2 — Rip Rap
20 (linear feet)
20 (linear feet)
Road Crossing #2 —Temp
impacts
20 (linear feet) "Coffer Dam"
29 (linear feet) "Temporary
Construction Access"
Road Crossing- Zone 1
6,521 (square feet)
10,815 (square feet)
Road Crossing — Zone 2
5,476 (square feet)
7,412 (square feet)
2) Please provide additional details on the requested "Temporary Construction Access" versus the previously
approved "Coffer Dam" impact for Road Crossing #2. [15A NCAC 02H .0502(c)] The Coffer Dam is part of the 29
Linear Feet Temporary Stream Impact. The coffer dam is shown on the plans.
Kevin C. Martin
Principal
Soil & Environmental Consultants, PA
North Quarter Office Park
8412 Falls of Neuse Road, Suite 104
Raleigh, NC 27615
[phone] Office Phone
[phone] Fax
1

[phone] Mobile
[e-mail]
Visit us at SandEC.com!
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From: Kevin Martin
Sent: Monday, December 13, 2021 4:52 PM
To: Cohn, Colleen M <[e-mail]>
Cc: [e-mail]
Subject: RE: Legacy Subdivision
I am passing the first two on to the engineer to address
But the SOA for buffer mitigation is attached, It was supposedly uploaded with the pcn.
Kevin C. Martin
Principal
Soil & Environmental Consultants, PA
North Quarter Office Park
8412 Falls of Neuse Road, Suite 104
Raleigh, NC 27615
[phone] Office Phone
[phone] Fax
[phone] Mobile
[e-mail]
Visit us at SandEC.com!
This electronic communication, including all attachments, is intended only for the named addressee (s) and may contain confidential information. This electronic
communication may not have passed through our standard review/quality control process. Design data and recommendations included herein are provided as a
matter of convenience and should not be used for final design. Rely only on final, hardcopy materials bearing the consultant's original signature and seal. If you
are not the named addressee (s), any use, dissemination, distribution or copying of this communication is prohibited. If you have received this electronic
communication in error, please notify the sender by return e-mail and delete the original communication from your system. Thank you
From: Cohn, Colleen M[mailto:[e-mail]]
Sent: Monday, December 13, 2021 4:44 PM
To: Kevin Martin <[e-mail]>
Cc: [e-mail]
Subject: Legacy Subdivision
Good afternoon,
I am in the process of reviewing the above referenced project, and in order to complete the review, some additional
information is required:
1) It appears that the impacts listed for Road Crossing #2 are greater than those previously approved under DWR#
20180191 on March 22, 2018. Please provide additional details concerning avoidance and minimization for this
road crossing, including additional information on why this project requires additional impacts. [15A NCAC 02H
.0506(b)(1)]
Impact
Previously Approved
Requested
Road Crossing # 2- Culvert
82 (linear feet)
113 (linear feet)
Road Crossing #2 — Rip Rap
20 (linear feet)
20 (linear feet)
Road Crossing #2 —Temp
impacts
20 (linear feet) "Coffer Dam"
29 (linear feet) 'Temporary
Construction Access"
Road Crossing- Zone 1
6,521 (square feet)
10,815 (square feet)
2

Road Crossing — Zone 2
15,476 (square feet) 17,412 (square feet)
I
2) Please provide additional details on the requested "Temporary Construction Access" versus the previously
approved "Coffer Dam" impact for Road Crossing #2. [15A NCAC 02H .0502(c)]
3) You have indicated that you are making a payment to satisfy buffer mitigation requirements for this project.
Please provide a mitigation acceptance letter from an appropriate mitigation bank or the NCDMS. [15A NCAC
02B .0611(b)(1)(I)]
Thanks,
Colleen Cohn
Environmental Specialist II
North Carolina Department of Environmental Quality
Division of Water Resources
Raleigh Regional Office
380o Barrett Drive
Raleigh, NC 27609
Office: 919-791-4258
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.
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