20230828 Ver 1_ePCN Support Binder Dam-21_20230608

MOGENSEN MITIGATION, INC. P4W
ENVIRONMENTAL CONSULTING MOGENSEN MITIGATION.INC
MMI-RALEIGH OFFICE
104 East Chestnut Avenue MMI MAIN OFFICE--CHARLOTTE
Wake Forest, NC 27587 PO Box 690429, Charlotte, NC 28227
Tel: [phone] [e-mail] Tel: [phone] [e-mail]
Preliminary Jurisdictional Determination (PJD) and Pre-Construction Notification (PCN)
Deep Creek Watershed Flood Control Dam 21 Repair, Yadkin County, NC
08 June 2023
Prepared For:
Yadkin County Soil & Water Conservation District
2051 Agricultural Way, Suite 207
Yadkinville, NC 27055
For Submittal To:
US Army Corps of Engineers NC Division of Water Resources
Asheville Regulatory Field Office 401 Buffer Permitting Unit
151 Patton Avenue, Room 208 450 Hanes Mill Road, Suite 300
Asheville, North Carolina 28801 Winston-Salem, NC 27105
Introduction and Site Description
On behalf of the Yadkin County Soil & Water Conservation District (SWCD), Mogensen Mitigation Inc
(MMI) is submitting this Section 404-401 Joint PCN application (NWP-3) for the proposed repair work
at Deep Creek Dam 21 in western Yadkin County NC (Figure 1). The dam was built for flood control by
the US Department of Agriculture (USDA) in the 1960s on an unnamed tributary of South Deep Creek
at Latitude 36.0927, Longitude -80.7210. It is one of a network of 15 flood-control dams in the Deep
Creek watershed planned and authorized by USDA in 1958. Dam 21 is on private land but the dam is
owned by SWCD which has a permanent easement for maintaining and operating the facility.
MMI environmental scientists mapped jurisdictional wetlands and waters around the dam and lake in
April 2021. The lake upstream of the dam and plunge pool below the principal spillway outlet are open
Environmental Field Studies ■ Wetland &Stream Delineation ■ 404-401 Permits ■ Mitigation Plans& Banking

MOGENSEN MITIGATION, INC.
waters, and the channel below the plunge pool is a perennial stream. Tributary streams and wetlands
enter the middle and upper portions of the lake 400 feet or more upstream from the riser, far beyond
the proposed impact area. Jurisdictional waters that will be directly affected are open waters only.
Work Description and Impacts
Schnabel Engineering evaluated the condition of all USDA dams in the Deep Creek watershed and
identified 10 dams that need repair work on and around their principal spillway risers, including low-
level drain gates, trash racks, manhole covers, ladders, and sediment excavation. The sediment
excavation and riser repair work will be conducted by either of two methods, to be determined by the
contractor on a case-by-case basis:
Alternative A: Maintain Full Pool
1. Install the temporary construction entrance (crushed rock) along the route to the riser work area
and establish the staging area and erosion and sediment control measures in accordance with the
construction drawings and technical specifications.
2. Plug the principal spillway conduit pipe to maintain full pool elevation. Outflow will be routed over
the auxiliary spillway during the construction work. Install a temporary turbidity curtain in the plunge
pool area below the dam.
3. Use a boat-mounted hydraulic dredge to remove sediment within the designated area around the
principal spillway riser to the depth needed to facilitate replacement of the riser slide gate. Sediment
slope around the riser after dredging shall be no steeper than 5 horizontal to 1 vertical to prevent
slumping, as shown on the sediment removal plan sheet.
4. The hydraulic dredged sediment and water mixture will be pumped into sediment filter bags set up
along the shore of the lake with erosion control measures to retain the sediment and allow nearly
sediment-free water to flow back into the lake.
5. The dewatered sediment will be trucked to the designated sediment disposal site and spread on
existing farmland. The sediment disposal site plan also includes erosion and sedimentation control
measures. No streams, wetlands, or forest lands will be directly affected by the sediment disposal.
6. The low-level gate replacement work will be conducted under water. Remove the existing low stage
trash rack and cut all old anchor bolts to be flush with riser concrete surfaces. Remove the existing
slide gate, steel stem, stem guides, and operator. Install new stainless steel wedge type anchor bolts
and new cast iron slide gate, stainless steel stem, and operator. New stem guides, bolts, and anchors
shall be located at least 6-in from any existing stem guide bolt/hole.
Page 2

MOGENSEN MITIGATION, INC.
7. Replaced structures and demolition debris will be disposed of at a construction debris facility
regulated by the Division of Solid Waste Management.
8. Remove all temporary erosion and sediment control devices and filter bags. Apply seeding to all
disturbed areas in the work area and along the access road in accordance with the technical
specifications.
Alternative B: Drain the Lake
1. Install the temporary construction entrance (crushed rock) along the route to the riser work area
and establish the staging area and erosion and sediment control measures in accordance with the
construction drawings and technical specifications.
2. Lower the water level in the lake by not more than one foot per day using the drain gate if operable
and/or pumps or siphons. The reservoir will be maintained in a drained condition for the duration of
the riser repairs. Install a temporary turbidity curtain in the plunge pool area below the dam.
3. Remove sediment and debris from the designated area around the riser using excavators in the
drained lake bed. Sediment slope around the riser after dredging shall be no steeper than 5 to 1
horizontal to vertical to prevent slumping, as shown in the sediment removal plans. Erosion control
measures such as temporary basins, check dams, sediment filter bags, and/or other appropriate
measures as determined by the contractor will be used in the sediment dewatering area to minimize
turbidity and sedimentation into the receiving stream below the dam.
4. Install a small temporary cofferdam around the riser base using either riprap and crushed rock fill or
a synthetic water-filled bag such as an "AquaDam" to keep sediment from slumping back into the work
area. The contractor will determine the appropriate method for the site; either method will occupy
not more than 200 square feet of lake bed within the excavation area.
5. The dewatered sediment will be trucked to the designated sediment disposal site and spread on
existing farmland. The sediment disposal site plan also includes erosion and sedimentation control
measures. No streams, wetlands, or forest lands will be directly affected by the sediment disposal.
6. Remove the existing low stage trash rack and cut all old anchor bolts to be flush with riser concrete
surfaces. Remove the existing slide gate, steel stem, stem guides, and operator. Install new stainless
steel wedge type anchor bolts and new cast iron slide gate, stainless steel stem, and operator. New
stem guides, bolts, and anchors shall be located at least 6-in from any existing stem guide bolt/hole.
Page 3

MOGENSEN MITIGATION, INC.
7. Replaced structures and demolition debris will be disposed of at a construction debris facility
regulated by the Division of Solid Waste Management.
8. Remove all temporary erosion and sediment control devices and filter bags. Apply seeding to all
disturbed areas in the work area and along the access road in accordance with the technical
specifications. Maintain a minimum baseflow in the receiving stream to protect aquatic life while
allowing the lake to refill.
The temporary access road from Helton Road to Dam 21 will use existing agricultural fields and the
auxiliary spillway which is maintained as mowed grass. No tree clearing or other disturbance to natural
plant communities will be needed. The area of proposed sediment excavation on the lake bed extends
40 to 50 feet around the riser base and covers approximately 0.16 acre. The temporary cofferdam fill
around the riser will occupy less than 200 square feet (0.005 acre) within the excavated area. Wetlands
adjacent to the upper portion of the lake may be temporarily dewatered if construction alternative B is
selected.
Impact# Feature Water Type acre Temp/Perm Impact Purpose
0-1 Lake open water 0.16 temp sediment excavation
0-2 Lake open water 0.005 temp temporary cofferdam
Please call or email me if you need any further information.
Sincerely,
Aw"�--7
Gerald Pottern, M.S.
Senior Biologist
Mogensen Mitigation Inc
-------------------------------------
Office Land Line: 919-556-8845
Mobile /Text: 919-649-6506
-------------------------------------
[e-mail]
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Page 4

MOGENSEN MITIGATION, INC.
ATTACHMENTS
Cover Letter for ePCN Application
USACE & NCDWR ePCN Joint Permit Application
Agent Authorization Form
USDA Permanent Easement
Figure 1. Project vicinity map, Deep Creek flood control dam riser repairs, Yadkin County NC.
Figure 2. Deep Creek Dam 21 - Dam site and parcel map, Yadkin County NC.
Figure 3. Deep Creek Dam 21 sediment dredging area map.
Figure 4. Site access road and staging area plan, Deep Creek Dam 21.
Figure 4. National Wetlands Inventory Map, US Fish & Wildlife Service
Figure 5. Dam 21 riser profile, sediment dredging, and sediment disposal area SD-1.
Figure 6. Riprap inlet protection around spillway riser and sediment filter bag layout.
Figure 7. NC-SHPO historic structures, Deep Creek Dams 21, 22A, 23, 30A, and sediment disposal site.
Figure 8. Jurisdictional waters and wetlands in the vicinity of Deep Creek Dam 21.
Page 5

AGENT AUTHORIZATION FORM for US-ACE / NC-DEQ Permitting
PROJECT NAME: Deep Creek Watershed USDA Flood Control Dams, Yadkin County
PROPERTY LEGAL DESCRIPTION: see attached list below
PARCEL ID: see attached list below
STREET ADDRESS: see attached list below
PROPERTY OWNER: Yadkin County Soil& Water Conservation Distict
The undersigned, registered property owners of the above noted property, do hereby authorize:
Gerald Pottern of Mogensen Mitigation Inc (MMI)_
(Contractor/ Agent) (Name of consulting firm)
to act on my behalf and take all actions necessary for the processing, issuance and acceptance of this permit or
certification and any and all standard and special conditions attached.
By signing below, I authorize representatives of the U.S. Army Corps of Engineers (Corps) and NC Division of
Environmental Quality (DEQ) to enter upon the property herein described for the purpose of conducting on-site
investigations, if necessary, and issuing a jurisdictional determination pursuant to Section 404 of the Clean
Waters Act and/or Section 10 of the Rivers and Harbors Act of 1899. I, the undersigned, am the duly authorized
owner of record of the property identified herein.
PROPERTY OWNER ADDRESS (if different than property above):
Yadkin County Soil and Water Conservation District
2051 Agricultural Way, East Elm St, Yadkinville NC 27055
Telephone: [phone] Email: iwalkerkyadkincount. n�c.gov
Jason Walker, Director, Yadkin SWCD
Print Name 1
Authorized Signature 1
Date, /O

PROPERTIES,ADDRESSES, OWNERS, and PARCEL ID NUMBERS
Yadkin County SWCD has permanent easements on these properties for operating and maintaining the USDA
flood-control dams, recorded between 1959 and 1966. The original easement document for each dam is
included with the PCN application.
Dam # Parcel Site Address Current Owner Deed Ref 1959-1966 owner name
ID# on easement
21 154243 2225 Helton Rd Chamberlain, Lenuel 834/422 Burchette, Otto & Daisy
22A 119065 2804 Arnold Rd Arnold, William T 880/252 Arnold, William
23 120760 Bethel Church Rd Chamberlain, Lenuel F 1278/606 Gough, C.A.
30A 129175 1428 Hoots Rd Allen, Francis Eugene 1158/334 Carlton, E.C.
6B 118133 Ralph Rd Reavis, Marie 92/491
19A 121522 1913 Weatherman Rd Casstevens, Gray 66/535 Casstevens, Gray
12 119786 Morgan Rd Ladd Family Land, LLC 1208/ 136 Weatherman, Vallie
15B 131388 Abraham Rd Shore, Rodney Gray 1298/374 Caudle, Twiman & Helen
24 131407 2300 Sanders Ridge Ln Shore, Neil Arnie 917/549 Shore, Carl & Beatrice
10 120272 Sprouse Rd Moxley, Marcus L 942/ 157 Wooten, Roy& Martha

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LIST OF FIGURES
Figure 1. Project vicinity map, Deep Creek flood control dam riser repairs,Yadkin County NC.
Figure 2. Deep Creek Dam 21 - Dam site and parcel map,Yadkin County NC.
Figure 3. Deep Creek Dam 21 sediment dredging area map.
Figure 4. Site access road and staging area plan, Deep Creek Dam 21.
Figure 4. National Wetlands Inventory Map, US Fish &Wildlife Service
Figure 5. Dam 21 riser profile, sediment dredging, and sediment disposal area SD-1.
Figure 6. Riprap inlet protection around spillway riser and sediment filter bag layout.
Figure 7. NC-SHPO historic structures, Deep Creek Dams 21, 22A, 23, 30A, and sediment disposal site.
Figure 8. Jurisdictional waters and wetlands in the vicinity of Deep Creek Dam 21.

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HUC N 03040101-1101 No\�o �'•,,, / Yadl�i Country i to
HUC N 03040101-1102
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f I J '' SD-2 C ter
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Esri,NASA,NGA,USGS I State of North Carolina DOT,Esri,HERE,Garmin,SafeGraph,...
Figure 1. Project vicinity map, Deep Creek flood control dam riser repairs,Yadkin County NC. USDA dam numbers in black;
sediment disposal sites in red; USGS watershed HUC numbers in blue.

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211
Figure 2. Deep Creek Dam 21 - Dam site and parcel map,Yadkin County NC
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YADWN COUNTY,SWCD ENVIRONMENTAL IMPACTS
Areas Sthnabel YADKIN COUNTY,NC DAM 021
FLL, 4 MAP
Tempor.ry Impacted 11p-Water A— (0.1 saes 6,000 sq—feet) PROJECT NO,22210C42.000
Figure 3. Dam 21 sediment dredging area map. Impact=90 x 80 ft=0.16 acre open waters. No stream or wetland impact.

DEEP CREEK DAM 21
qo
EROSION AND SEDIMENT CONTROL LEGEND
PROPOSED TEMPORARY
CONSTRUCTION ENTRANCE
(SEE DETAIL 2 THIS SHEET)
TITLE SYMBOL
TEMPORARY STONE
CONSTRUCTION ENTRANCE
RIPRAP INLET PROTECTION
FILTER SAG -
F
SILT FENCE r
r
7.
_
PROPOSED ACCESS ROUTE
' SEE DETAIL 5 THIS SHEET
3 LT FENCE NOTES.NOTE 21
1` , a.
PROPOSED STAGING AREA �t w
0.13ACgurp 4. Site access road and sta in are plan; Riser repairs at
"' *'' T �t ►' }� �bb� AUXILIARY SPILLWAY
PRINCIPAL SPILLWAY
RISER STRUCTURE
DAM 21
PRINCIPAL SPILLWAY
11 CONDUIT OUTLET 4 .
'. — Win. PLUNGE POOL
• s
SITE ACCESS AND STAGING PLAN VIEW
0 150 300feet

pSS RpAp
• I
1 ( _ TEMPORARY STONE
L S 1 I CONSTRUCTION ENTRANCE
1
- I
I SILT FENCE z�
1
I I
I I
I I
I I
I I
I
I
I I
I I
I I
I I
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I NORMAL POOL
I i EL 8M.3 PER SURVEY
NORMAL POOL I -- f
I I � I APPROXIMATE TOP OF
EL 8U.3 PER SURVEY I L --
.£DIMENT''d'9E_OVi
NORN.A POOL
r -- • — SEDIMENT TO BE REMOVED
I I
I I
I I
I
APPROXIMATE TOP OF I
SEDIMENTC-SBELOW I I MIN.5 �
NORMAL POOL1 —
SEDIMENT TO BE REMOVED .� \�. I EXCAVATION LIMITS
I I S-0•MW.
I I
I L -----�
i J
5 MM. INTAKE
GATE ------------- —
EXCAVATION LIVrTS
_ _ EXITING 30'DUl RCP
.r `_{�MIN- _y PRINCIPAL SPILLIWY OUTLET
Figure S. Dam 21 riser profile, sediment dredging, and sediment disposal area SD-1, Hoots Road. Only the cleared field areas will be used for sediment disposal.

O
AREA TO BE LOW-LEVEL INLET RISER
DISTURBED I I CLASS I RIPRAP
2.0 RISER
1 0 �+--� I I COARSE AGGREGATE
2
+r 1.0'MIN FLOW
F�by FLOW __
SEDIMENT STORAGE
+L MIN_5.0' AREA
2.5 CLASS I RIPRAP ON NON-WOVEN GEOTEXTILE
4.0' NCDOT#5 OR#57 COARSE AGGREGATE O�
MAX.SEDIMENT DEPTH(CLEAN OUT POINT) AREA TO BE F� LOW-LEVEL
1.5'MIN. ATZ VOLUME OF WET STORAGE AREA DISTURBED
INLET
ELEVATION PLAN VIEW
4 RIPRAP INLET PROTECTION
N.T_S.
VA3.L VEGETATED AREA DISCHARGE HOSE
hD®E CLAMPS
CLAMPS
FILTER SAG
FILTER BRAG
WELL VEGETATED.GRASSY AREA
wai VEGETATED,GRASSY AREA Puy
IM HOSE ELEVATION VIEW
PIAP
PLAN VIEW INTAKE HOSE
FILTER BAG NOTES: MAINTENANCE NOTES:
1. USE FILTER BAGS AS NECESSARY TO 1. SEDIMENT FILTER BAG SHALL BE DISPOSED
TREAT WATER PUMPED FROM OF AND REPLACED WHEN IT IS 3/4 FULL OF
EXCAVATION. SEDIMENT OR WHEN IT IS IMPRACTICAL
FOR THE BAG TO FILTER THE SEDIMENT
2. PLACE FILTER BAGS IN WELL VEGETATED OUT AT A REASONABLE FLOW RATE.
AREAS OF THE AUXILIARY SPILLWAY
SUCH THAT FILTERED FLOW WILL ENTER 2. INSPECT THE BAG INLET PERIODICALLY
THE OUTLET STREAM CHANNEL. FOR DAMAGE AND/OR BLOCKAGE.
Figure 6. Riprap inlet protection around spillway riser and sediment filter bag layout.

YD0647 William Reynolds vv�J
leneral • Find address,lhistoric resource Q • House 199000
• Rd
sits is
$+YD02�VanFloy_F 421 MQmoriai Rn—
• ..ruse
Dam 30A`
Hoots
Hoots Rd Rq
YDD25Q,Carlton Family
If H use 1990
YD0670 James Sanford YD0248 Renegar Family oots�
Garner House Farm
SD-1
y w •
YD0256 Hauser-Hoots
�o'�� x
House
B House YD0662 Helton Family
lyr YD0287 Hootslreland House YD0668 HouseiksLorlg _.
�ghtlQn House _-
YD0448 John H_H4iiserYD0448 .
a Farm 1986 Fat
U YD0249 Log House&
Barn
L
U
y
t
• U
• • m YD0251 Brandon-Reaves
House
A'i'oo P.Fri •YD0312 W. Wood House
YD0698 William Smith /Dam-21 YADKIN
As Arnold House
c
n Rd Dam-22A I i ° YD0261
2 a
YD0252 Isaac W.Steelman YDO'
YD0300 Haynes-White-Wood <. Farm
House t YD0262 U A.Marl
Store
YD0263,,tu.A.Martin
q, ocyHouse
rycyid Lone
oe O
se Qa o
or
)1 Cart R.Whitaker �'r
Fishe, C`ee
Housen N
a_
Dam-23 0 "
3
00
s
YD0267 Graves-Martin-Hold
YD0410 Hanes Family Farm l
House 1986 1.0 mile
■ rn
Figure 7. NC-SHPO historic structures, Deep Creek Dams 21, 22A, 23, 30A, and sediment disposal site SD-1. Features with black centers are gone.

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alluvial forest
(part wetland) • �F
d
perenMal stream alluvial forest
(part wetland)
mar;f
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mesic forest mesic forest
open water
water
mesic forest 1RtteYm`a eft
A►+told Road '�:�_ . h
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Figure 8. Jurisdictional waters and wetlands in the vicinity of Deep Creek Dam 21,Yadkin County NC.