20201834 Ver 1_More Info Received_20211026

P
TIMMONS GROUP Raieigu2 F
Raleigh, NC 27607 www.timmons.com
October 26, 2021
Brandee Boggs
U.S. Army Corps of Engineers — Wilmington District
Asheville Regulatory Field Office
151 Patton Avenue, Room 208
Asheville, NC 28801-5006
Sue Homewood
NCDEQ — Division of Water Resources
Winston-Salem Regional Office
450 W. Hanes Mill Road, Suite 300
Winston-Salem, NC 27105
Re: Response to Requests for Additional Information
Partin Solar
USACE AID: SAW-2019-01186
(Approx. 433.3 acres)
Surry County, North Carolina
Dear Ms. Boggs and Ms. Homewood,
On behalf of DEPCOM Power, Inc. we are providing a response to the Request for Additional Information
(RAI) emails received on September 27, 2021 for Partin Solar, an approximately 433.3-acre site located at
approximately Elkin Wildlife Road (SR 1142) and Parks Road (SR 1140) in Elkin, Surry County, North
Carolina (the Site).
The revised Impacts Maps have been attached showing adjustments to road shoulder slopes at Culverts
#1 and #2, reducing slopes from 4:1 to 2:1, reducing permanent stream impacts from 260-I.f. (0.02-ac.) to
220-I.f. (0.018-ac.), permanent — no loss stream impacts from 42-I.f. (0.003-ac.) to 29-I.f. (0.002-ac.), and
permanent wetland impacts from 0.03-ac. to 0.018-ac. of permanent and 0.003-ac. of temporary impacts.
Further, corrugated steel pipe is proposed for culvert construction as opposed to reinforced concrete pipe
to allow for streambed naturalization throughout the crossings. In addition, Culvert #2 is no longer proposed
to be buried due to the steep slope of the stream. With proposed stream impacts now below the 0.02-ac.
mitigation threshold set by NWP 57 and the USACE's Wilmington District Regional General Conditions,
mitigation for impacts to streams is no longer proposed.
The comments are outlined below in italics and are grouped by impact, with DWR comments in green. Our
response is below each comment.
1) Can you please provide a plan sheet that includes the proposed road network throughout the site?
Plan sheets for the proposed road network throughout the entire Site have been included in the
attached exhibits (see Sheet Nos. C5.01 and C5.07-05.10).
ENGINEERING I DESIGN I TECHNOLOGY

2) Can you clarify what buffers are being provided between the LOD and the streams and wetlands on
site, I am unable to tell at the scale provided on Sheet 1 and it appears that maybe there are different
buffer distances along different features.
Riparian buffers between the LOD and jurisdictional features onsite were placed 15-feet from streams
and wetlands, where possible, due to tree clearing limits onsite. These boundaries were determined to
limit shading of the solar panels. Other than stream crossing locations, disturbance within 50-feet of
streams is limited to tree clearing by hand and no grubbing allowed.
3) The road shoulders above culvert #1 are proposed for a 4:1 grade. We prefer to see 3:1 or steeper in
order to reduce stream impacts.
Road shoulder slopes above Culvert #1 have been reduced from 4:1 to 2:1 (see Sheet No. EX1.0),
reducing permanent stream impacts from 118-I.f. (0.014-ac.) to 108-I.f. (0.013-ac.) and permanent — no
loss stream impacts from 21-I.f. (0.002-ac.) to 8-I.f. (0.001-ac.). See Table 1. Revised Impacts Summary
below for a summary of updated impact amounts.
4) Culvert #2 is at a very steep grade and DWR would prefer that the culvert be placed at grade instead
of buried 1 foot.
Due to the steep slope of the existing stream, the invert and outvert of Culvert #2 have been placed at
grade and are no longer proposed to be buried (see Sheet No. EX2.0), reducing the slope of the culvert
from 9.83% to 9.17%.
Further, road shoulder slopes at Culvert #2 have been reduced from 4:1 to 2:1 to reduce impacts to
jurisdictional features. An updated summary of proposed impact amounts can be found in Table 1.
Revised Impacts Summary below. Of note, impacts to wetlands have been reduced from 1,225-sq.ft.
(0.03-ac.) of permanent impacts to 788-sq.ft. (0.018-ac.) of permanent and 109-sq.ft. (0.003-ac.) of
temporary wetland impacts. Temporary wetland impacts are necessary for culvert and riprap installation
and impacted areas will be allowed to regrow following completion of the crossing.
5) Can your client switch to something other than RCP culverts as requested by NC WRC?
The culverted crossings are now proposing to use corrugated steel pipe to allow for naturalization of
the stream channel through the crossings (see Sheet Nos. EX1.0 and EX2.0).
Table 1. Revised Impacts Summary
Wetland Impacts
Stream Im acts
Impact
Location
Reason for
Impact
Permanent
Temporary
p y
Permanent
Permanent
(No Loss)
(sq.ft.)
I (ac.)
(sq.ft.)
(ac.)
(U.)
(sq.ft.)
(ac.)
(U.)
(sq.ft.)
(ac.)
Culvert #1
Road crossing
0
0
0
0
108
553
0.013
8
40
0.001
Culvert #2
Road crossing
788
0.018
109
0.003
112
226
0.005
21
21
0.001
Total Impacts
788
0.018
109
0.003
220
779
0.018
29
61
0.002

Please review the updated Impact Maps and contact Sydni Law at [phone] or
sydni.lawa-timmons.com if additional information is required.
Sincerely,
Timmons Group
Gq"�� L��
Sydni Law, WPIT
Environmental Scientist
Lauren Norris -Heflin
Environmental Project Manager
ENCLOSURE
Sheet No. EX1.0 — Revised Culvert #1 Crossing Details
Sheet No. EX2.0 — Revised Culvert #2 Crossing Details
Sheet No. C5.01 — Overall Grading Plan
Sheet Nos. C5.07-05.10 — Site Layout and Grading Plan

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