20220212 Ver 1_More Info Received_20220411

Strickland, Bev
From: Deborah Shirley <[e-mail]>
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
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Report Spam.
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

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elevation = 254.0 ` 17,4�► f".
Wet Deter
Basin Outkk
Adjacent
Q10 = 42.E
V10 = 8.70
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 on 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.
/
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.
Please 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
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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

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Wet Detention Basin outfall pipe. Pipe
will penetrate retaining wall and
discharge onto the Permanent Turf
Reinforcement Matting adjacent to the
Box Culvert.
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.
Please 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.
3
Thanks,
RETAINING
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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
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North Carolina Public Records Law and may be disclosed to third parties.
6

ENVIRONMENTAL
CONSTRUCTION SOLUTIONS
Specifications for Coir 700 Matting
Coir 700 is a biodegradable erosion control fabric made up of a single layer of
continuously woven coir (coconut fiber) matting. It is designed to be used on slopes,
shorelines and streamlines for erosion & sediment control. It is also designed to hold
seed intact during the establishment of vegetative cover. Coir Matting is an
environmentally friendly product.
Property
Test Method
Coir 700
Weight
ASTM D 3776
20.65 oz/sq.yd (700 g/sq.m)
Tensile Strength Machine Direction
ASTM D 4595
1348 x 626 Ibs/ft
Elongation at Failure Wet Machine Direction
ASTM D 4595
34% x 38%
Flexibility (Mg -Cm)
65030 x 25590
Longevity
4-6 years
Open Area
Calculated
50%
"C" Factor
0.002
Thickness
ASTM D 1777
0.30 in
Minimum Twine Count MD x CD (per foot)
27 x 18
Recommended Slope
1:1
Flow Velocity
Observed 11 fps (3.5 m/s)
Shear Stress
4.5 Ibs/sq.ft (215 N/sq.m)

40 EROSION
CONTROL
Specification Sheet - Eco-Stake" 6 inch, 12 inch, 18 inch, and 24 inch
DESCRIPTION
Eco-Stake 6 inch and 12 inch
The Eco-Stake is a 100% biodegradable hardwood pin designed to
safely and effectively secure erosion control blankets. The wood
stake must exhibit ample rigidity to enable being driven into hard
ground, with sufficient flexibility to resist breakage.
Eco-Stake 18 inch and 24 inch
The Eco-Stake is a 100% biodegradable straight hardwood stake
tapered to a point at one end, designed to safely and effectively
secure sediment control devices. The wood stake must exhibit
ample rigidity to enable being driven into hard ground, with
sufficient flexibility to resist breakage.
Designation 6 in. Eco-Stake 12 in. Eco-Stake
Leg Length 5.00 in. (12.70 cm) 11.00 in. (27.94 cm)
Head Width 1.2S in (3.18 cm) 1.2S in (3.18 cm)
Head Thickness 0.40 in (1.02 cm) 0.40 in (1.02 cm)
Leg Width (tapered 0.60 in (1.52 cm) 0.60 in (1.52 cm)
to point)
Leg Thickness 0.40 in (1.02 cm) 0.40 in (1.02 cm)
Total Length 6.00 in (15.24 cm) 12.00 in (30.48 cm)
Designation 18 in. Eco-Stake 24 in. Eco-Stake
0.75x0.75in USx0.75in
Leg Thickness
(1.90 x 1.90 cm) (1.90 x 1.90 cm)
Total Length 18.00 in (45.72 cm) 24.00 in (60.96 cm)
North American Green North American Green warrants that
NORTH
5401 St. Wendel-Cynthiana Rd. shall conform to the specification stated herein. Any other warranty including
AMERICAN POSeyVille,IN47633 merchantability and fitness for a particular purpose, are hereby executed. If the product
does not meet specifications on this page and North Amercian Green is notified prior to
GREEN® 800-772-2040 installation, North American Green will replace the product at no cost to the customer. This
product specification supersedes all prior specifications for the product described above
nagreen.com and is not applicable to any products shipped prior to January 1, 2017.
©2017, Tensar International Corporation
EC GEN MPOS Eco-Stake 4.17

Large Wooden Stakes
1.5" Square x 24" Long
Material: Mixed Hardwoods
1.5'
0..
"Pencil" point
Note: 3" Galvanized nail to
be installed in field.