20240497 Ver 1_20240607_Response to DWR Additional Information Request #1_Final_20240607

SunI" FEE RE—=%rs
6/2/2024
RE: Cherry Solar
DWR# 20240497
USACE Action ID. #s SAW-2021-01374 & SAW-2020-01825
A request for additional information was received from NCDWR via email on 5/31/2024. The
following eight items state the requested additional information along with the responses to each.
1. Please provide updated impact maps that clearly depict both the wetland and stream naming
conventions you have chosen. For example, you have "crossing 2" impacting wetland 23 and
stream 2. Those labels are not depicted on the maps that were submitted with the PCN.
Response: Per discussion with Joe Myers (NCDWR) on 5/31/2024. It was confirmed that adding
crossing location callouts over the PJD maps (which identify the stream and wetland features
with labels) would satisfy this request. These maps are provided as Attachment A.
2. Please provide us with a copy of the Statement of Availability (SOA) for the mitigation that has
been secured for this project.
Response: Please see a copy of the Statement of Availability from Great Dismal Swamp
Mitigation Bank provided as Attachment B. This was included with the PCN submittal
documentation. We are unsure why it did not end up in the project file.
1g. Is payment Into a mitigation bank or In -lieu fee program proposed for mitigation of Impacts?
Ii co, amch Ne acceptance letter from mitigation bank or iMleu fee program.
Yes No
Acceptance Letter Attachment
Click she riploatl Autton or tlrag a,d tlmp files hereto attach dooumen[
SunEnergyi - Cherry Solar LLC SAW-2020-01825 - SAW-2021-01374 Revised 03262024.pdr 206.79KB
FILE TYPE MUST EE PDF
1h. Is the project located in any of NVs twenty coastal counties?
Yes No
11. Is the project located in a designated trout watershed? `
Yes No
Link to trout inforr ution: hUP.1AVwwsaw.usace.army.miUMissionsfRegulatory-Permil-PrograrnlAgency-CoorclinationlRout.aspx
B. Applicant Information
595 Sunu erStreet, 4"" Floor, St-amf&rd, CT 06901 • Phovtz' 704.662.0375

SunN�" FEE RE-=%irs
3. Additional Mitigation required - mitigation shall be required for impacts equal to or exceeding
300 linear feet per perennial stream. On the PCN, you indicate that there will be 539 linear feet
of permanent perennial stream impacts, but in the mitigation section you only account for 126
linear feet . Please provide an updated SOA that accounts for all permanent perennial stream
impacts.
Response: The stream impact table in the PCN incorrectly identified all streams as perennial.
This was an oversight on our part. An updated table to correctly identify the stream type has
been provided as Attachment C. The correct total permanent perennial stream impacts is 202
linear feet, which is below the DWR mitigation threshold.
4. In the mitigation section of the PCN, it is indicated that there are both non -riparian and riparian
wetland impacts. Can you confirm if the bottomland hardwood wetland impacts are to be
categorized as "non -riparian" wetland impacts and that the "non -tidal freshwater marsh"
impacts should be categorized as riparian wetland impacts?
Response: Not necessarily. Riparian wetland impacts involve a wetland associated with a
stream/streams. Non -riparian wetland impacts involve a wetland that is not associated with
a stream/streams. For clarity, wetland impacts associated with Crossing #'s 4 and 11 are
considered non -riparian.
5. In Phase C7, crossing #8 & crossing #9 are impacting the same stream. Please provide an
explanation of the need for two road crossings and how they meet our criteria for avoidance
and minimization of impacts to surface waters.
Response: Two crossings are necessary in order to provide for emergency ingress/egress. In the
event of an emergency, it is imperative that personnel are able to evacuate the facility and that
emergency response personnel are able to access the facility as quickly as possible. Two access
locations are necessary in case one is disabled (such as, for example, a tree falling across during
a storm or if a vehicle or piece of equipment breaks down and blocks access).
6. The culverts profiles show wetland culverts being buried and culverts at greater than 2.5% grade
being buried. Please see Item 11 in the attached GC4256 and reconfigure the design of all
culverts located in wetlands that are at 2.5% grade. Culverts located in wetlands are discouraged
from being buried.
Response: Only two of the crossings (#4 and #11) are wetland -only crossings. Each of the
other 10 include streams and require pipe burial in accordance with the NWP14 Regional
Conditions. With regards to the two wetlands -only crossings, we were unaware that pipe
burial in this instance is discouraged, although we knew it was not required, nor prohibited
in GC4246. We were trying to make every effort to provide aquatic passage, as we know this
is important to USACE and NCDWR. We have revised these two wetlands -only crossings to
eliminate pipe burial. The revised designs are included as Attachment D. The pipes are now
set at -grade in the wetlands.
595 SuvierStreet, 4"" Floor, Sta.m.{ard, CT 06901 • Phonev 704.662.0375

S LJ f%%I�"FEE FR G Y1
Only one (Crossing 4) of these two wetlands -only crossings shows the proposed culvert at
greater than 2.5% grade. This is because there is an existing farm road culvert that has been
in place for many years and needs to be replaced. The existing culvert was originally set at a
similar grade when originally installed, and the wetland on either side (through
sedimentation and erosion) developed a difference in surface elevation on each end of the
existing pipe. The pipe cannot be flattened without extensive, unnecessary disturbance to
the wetlands.
For the other crossings where pipe burial is required, GC4256 does not prohibit pipe burial
at greater than 2.5% grade, but simply states that burial isn't required. We cannot reduce
the grade without altering original/existing stream profiles. USACE has indicated that they
desire pipe burial for aquatic passage. As such we respectfully request to keep these as
designed.
7. The alignment of the culvert #12 appears to be installed perpendicular to the adjacent stream -
Please realign the outlet location of the culvert for the road crossing so that it is in better
alignment with the stream channel to help prevent streambank erosion. [15A NCAC 02H
.0506(b)(2)]
(See below for Culvert #12 inset)
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Response: This culvert was designed in the location of existing natural flow into the stream. As
requested, the pipe location has been revised to enter the stream in a less perpendicular
595 SuvierStreet, 4"" Floor, St-amf&rd, CT 06901 • Phone.' 704.662.0375

Surf% rj IFEERE� "'irs
alignment. The revised design drawing is included in Attachment E. Please note that this
requires a slight increase in permanent stream impacts. Please refer to Attachment C for the
updated impact quantity.
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8. After reviewing the road crossings, we have concerns with the amount of riprap that is being
used in the stream channels. Can you please provide justification for the amount of riprap being
used in these road crossings, as in some instances, the riprap placement is almost as long as the
culverts themselves. It appears to be an excessive amount and may not meet the criteria for
avoidance and minimization. Please provide your need for the amount of riprap proposed.
Response: Justification and methodology for riprap design has been prepared by the Engineer,
Timmons Group, and is provided as Attachment F.
595 Suv1.erStreet, 4f" Floor, St-amfar'd, CT 06901 • Phone' 704.662.0375

SunN�" FEE RE-=%irs
Attachment A: Impact Maps
595 SL mnwrStreet 4"" Floor, Stamford, CT 06901 • Phonev 704.662.0375

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Attachment 6: Statement of Availability
595 SL mnwrStreet 4"" Floor, Stamford, CT 06901 • Phonev 704.662.0375

The r�reat Disma[Swamy RestorationDank, LLC
P. n. Box 6186
Chesapeake, VA 23323
March 26, 2024
Nicholas Tillson
Environmental Specialist
Sun Energy 1
192 Raceway Drive
Mooresville, NC 28117
Project: Cherry Solar, LLC
SAW-202o-01825 & SAW-2021-01374
Dear Mr. Tillson:
Phone [phone]
Fax [phone]
The following price quote is given in reply to your request for the purchase of 0.276 Non -Riparian and 0.34
Riparian wetland mitigation credits, as well as 126 Stream Credits HUC Code 03010204 from The Great Dismal
Swamp Restoration Bank - Timberlake Farm. These credits are currently available from our Timberlake Mitigation
Bank.
The cost will be M. This quote will expire on June
30, 2024. You will need to submit to the USCOE the necessary application for said mitigation, and receive USCOE
permission to furnish said required credits from our Timberlake bank.
To complete this transaction, we will require payment in full. Once payment is received, the credit sale will be
reported to the US Army Corps of Engineers. Please provide and/or confirm the following information:
Permittee Name: Cherry Solar, LLC
SAW#s: SAW-2020-01825 & SAW-2021-01374
HUC: 03010204
Non -Riparian Credits: 0.276
Riparian Credits: 0.34
Stream Credits: 126
Mitigation Bank, Perm ittee, and Consultant agree not to discuss with any other party the details and/or pricing of
this agreement, unless necessary for regulatory matters. Information contained herein shalt be held in the strictest
confidence.
Thank you for allowing us to quote this project. We look forward to working with you.
Sincerely,
C
Beverly M. i t e
Manager — ounting / Sales
GDSRB
CC: File

SunM�" FEE RE-=%irs
Attachment C: Revised Stream Impact Table
595 SLLiNU wr Street 4"" Floor, Stamford, CT 06901 • Phonev 704.662.0375

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Attachment D: Revised Crossing Ws 4 and 11
Placing Pipe At -Grade
595 SLLiNU wr Street 4"" Floor, Stamford, CT 06901 • Phonev 704.662.0375

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SunM�" FEE RE-=%irs
Attachment E: Revised Crossing #12 Pipe
Alignment
595 SLLiNU wr Street 4"" Floor, Stamford, CT 06901 • Phonev 704.662.0375

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SunM�" FEE RE-=%irs
Attachment F: Outlet Protection Design
Justification
595 SLLiNU wr Street 4"" Floor, Stamford, CT 06901 • Phonev 704.662.0375

TIMMONS GROUP
ACHIEVED THROUGH OURS.
To: Joe Myers, NCDEQ
Project: Cherry Solar DWR#20240497 Date: 06.05.2024
Project Number: (Timmons Group - 46306)
Project Contact: Jacob Dooley; [phone]; Jacob. [e-mail]
Crossing Riprap Design Methodology.
The methodology utilized for the sizing of the Cherry Crossing Riprap outlet protection is based on the New York
DOT (NYDOT) Dissipator Method for Use in Defined Channels as specified in the NCDEQ Erosion and Sediment
Control Planning and Design Manual Section 8.06. The 10-year design storm was utilized for culvert and riprap
sizing calculations. Hydraflow Express was utilized to determine culvert sizing and 10-year outlet velocity. This
velocity was then used to calculate the required riprap pad sizing and stone classification per the NYDOT method.
For multi -pipe culverts, pipe size used for riprap sizing diameter was determined as by multiplying diameter of
pipe by 1.25 of a single culvert. For crossings consisting of one large pipe and two smaller pipes, the pipe
diameter calculation used the largest of the three pipes for design diameter for riprap apron sizing. Per the
NYDOT method, the recommended length of riprap apron to prevent a scour hole is determined using Figure
8.06d.
20
0 S 10. 15 N N
DIAMETER (FL)
Figure 8.06c
Sincerely,
Jacob Dooley, PE
W
6
N
APRON MATERIAL
LENGTH OF APRON
TO PROTECT
CULVERT
L1
TO PREVENT SCOUR
HOLE USE L2ALWAYS
L2
1
STONE FILLING (FINE) CL. A
3 X Do
4 x De
2
STONE FILLING (LIGHT) CL. B
3 X Do
6 x D.
3
STONE FILLING (MEDIUM) CL. 1
4 X D.
8 x D,
4
STONE FILLING (HEAVY) CL. 1
4 X Do
8 x D.
5
STONE FILLING (HEAVY) CL. 2
5 X Do
10 x D.
6
STONE FILLING (HEAVY) CL. 2
6 X Do
10 x D.
7 SPECIAL STUDY REQUIRED (ENERGY DISSIPATORS. STILLING
BASIN OR LARGER SIZE STONE).
Figure 8.06d
Width — 3 times pipc dia. (min.)
NEW YORK DOT DISSIPATOR METHOD
FOR USE IN DEFINED CHANNELS
(Source_ "Bank and channel lining procedures", New York Department of
Transportation, Division of Design and Constructing 1971 _)
NOTE: To use the fallowing chart you must know:
(I } Q full capacity
(Z) Qru
(3) V full
(4) V ru
where Q = discharge in cN and V = Velnci ty in FPS.
ESTIMATION OF STONE SIZE AND DIMENSIONS FOR
CULVERTAPRONS
Step I ) Compute Now velocity V at cul%ert or paved channel outlet.
Step 2) For pipe culverts D. A diameter.
For pipe arch, arch and box culvem, and paved channel outlets,
D = A where A. = cross -sectional area of[i ow at outlet.
For multiple culverts, use D = 1 25 x Do of si ng]e culvert.
Step 3) For apron grades of 10% or steeper, — recommendations
For nezt higher zone. (Zones I through 6).