20220212 Ver 1_RE_ Solana DWR#20220212_20220411

Deborah Shirley
From: Deborah Shirley
Sent: Monday, April 11, 2022 4:15 PM
To: Cohn, Colleen M
Cc: Norton, April R CIV USARMY CESAW (USA)
Subject: RE: [External] RE: Solana DWR#20220212
Attachments: Specifications for Coir 700 Matting.pdf; Specifications for Ecostakes.pdf; Specifications for Hardwood
Stakes.pdf
Colleen,
Thank you for reviewing our response and information so timely. I forwarded your request of additional information to
the team and below I am providing the responses to your questions.
1. The matting has polypropylene. Matting that incorporates plastic mesh and/or plastic twine should not be used
along streambanks or within wetlands.
This is a solution that the engineers are discussing, to include the McAdams engineering team and Patrick Smith
of our office. Coir 700 matting, which is a robust material that is heavy enough to withstand heavy stream flow
but also allows for vegetation to grow through it and no poly fibers (see attached). Please let us know if this is
an acceptable solution.
2. Please provide additional details as to why the SCM is discharging directly to the wetland. It seems like it is being
piped a long way from the closest SCM.
Please see the below snippet with the engineers response to the SCM discharge and it's discharge location at
the wetland, adjacent to the designed culvert crossings. Additionally, the Stormwater Management Plan has
been reviewed and approved by Durham however the pdf file is rather large, I will send via the DWR Project
Submittal Interim Form portal.
1

Wet Deter
Basin Outl�
Adjacent 1
ad'��
11 1 I f , O
1 1 1 1 1 1 I I I I I I + f ! '14
�v ��f Q10 = 42.6
.cif-Asir'4
� .
..por "'f �i� ci T v
MW
II-1�1wit&� _I��
a
"�
Pond normal pool.,
„• elevation = 284.0 � 4
riff A 11 P
This is the only location we have to outlet the flow from the wet detention
basin outside of the wetland. The normal pool of the pond is 1-ft lower than
the stream invert at this theoretical outlet location which made the location
infeasible. The normal pool of the pond can not be raised, because it would
back up water into the low point of the road crossing in larger storm events.
To increase the elevation of the roadway lowpoint would require pushing the
retaining walls/fill slopes outward and creating more open water/wetland
impact. We are extremely tight an the critical elevations including the
roadway low point, the normal pool of the pond, and the outfall location as
currently designed.
It is also our opinion that placing the pond outlet adjacent to the culvert will
provide the lowest impact to the wetland in terms of flow and velocity
increases, because the flow coming from that pipe will be minuscule
compared to the flow in the culvert, particularly in large storm events.
E.-
FIONBA #3
We anticipate that this provides the information for you to continue your review of the Pre -Construction Notification
application. Please let me know if you have any questions.
Thank you,
DEBORAH E. SHIRLEY
Project Manager -Regulatory Specialist
Soil & Environmental Consultants, PA
North Quarter Office Park
8412 Falls of Neuse Road, Suite 104
Raleigh, NC 27615
Office [phone]
Direct [phone]
Mobile [phone]
2

[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.
APlease consider the environment before printing this email.
From: Cohn, Colleen M <[e-mail]>
Sent: Friday, April 8, 2022 5:21 PM
To: Deborah Shirley <[e-mail]>
Cc: Norton, April R CIV USARMY CESAW (USA) <[e-mail]>
Subject: RE: [External] RE: Solana DWR#20220212
1. The matting has polypropylene. Matting that incorporates plastic mesh and/or plastic twine should not be used
along streambanks or within wetlands.
2. Please provide additional details as to why the SCM is discharging directly to the wetland. It seems like it is being
piped a long way from the closest SCM.
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.
From: Deborah Shirley <[e-mail]>
Sent: Friday, April 8, 2022 4:39 PM
To: Cohn, Colleen M <[e-mail]>
Cc: Norton, April R CIV USARMY CESAW (USA) <[e-mail]>
Subject: [External] RE: Solana DWR#20220212
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Colleen,
Please see our responses and the information provided by the project engineer.
1. Please provide additional information such as product specifications on the permanent turf reinforcement mats
proposed in In impact 8. What materials are these mats made of?
The proposal for the matting would involve a product similar to the attached, they are designed so that
after they are vegetated they become grown over and are no longer visible.
2. Can you please provide some additional information on the area I've circled in blue from the Impact 8 maps
(below)? I'm not sure I am understanding. There is a lot going on in this area.
Please see the below snippet with the engineers response regarding the pipe that you circled in your request for
more information.
3

l 47./i 1\ 1 1\
I Wet Detention Basin outfall pipe. Pipe
will penetrate retaining wall and
discharge onto the Permanent Turf
Reinforcement Matting adjacent to the
Box Culvert.
rpr
7-
We anticipate that this provides the information for you to continue your review of the Pre -Construction Notification
application. Please let me know if you have any questions.
Thank you,
DEBORAH E. SHIRLEY
Project Manager -Regulatory Specialist
Soil & Environmental Consultants, PA
North Quarter Office Park
8412 Falls of Neuse Road, Suite 104
Raleigh, NC 27615
Office [phone]
Direct [phone]
Mobile [phone]
[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.
APlease consider the environment before printing this email.
4

From: Cohn, Colleen M <[e-mail]>
Sent: Friday, April 8, 2022 3:50 PM
To: Deborah Shirley <[e-mail]>
Cc: Norton, April R CIV USARMY CESAW (USA) <[e-mail]>
Subject: Solana DWR#20220212
Good afternoon,
I am reviewing the above referenced project, and in order to complete the review, some additional information is
required:
1. Please provide additional information such as product specifications on the permanent turf reinforcement mats
proposed in In impact 8. What materials are these mats made of?
2. Can you please provide some additional information on the area I've circled in blue from the Impact 8 maps
(below)? I'm not sure I am understanding. There is a lot going on in this area.
-— —
�
BUFFER, ZONE 2 LIM▪ IT
SS w.A I h,
PETAISN�ING
YY AI
•
f
1 ". - —•
imrit mica
im____ l
Pr
►I
/
Thanks,
' 5[.
1,1>it r q 44
.~ -. lam■
14wt•al
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
riminnur
Er
{Istil
I
_
ini 1 �I- -
I� el
I
KINI-UI'Lt:MtNI M
U I
J1
rt
4' x 8' (2) CULVERTS (RCN
�I ,� ; 14-x8'SINGLE UL'vET
a �a�n,f -67. �'
+: r r
'It. 47447,1117
abh
TF I,
E-mail correspondence to and from this address may be subject to the
RETAINING
WALL
F‘-AL
019
5

North Carolina Public Records Law and may be disclosed to third parties.
6