20130280 Ver 1_401 Application_20130313

2®30280
Robert J. Goldstein and Associates, Inc.
RJG &A ENVIRONMENTAL CONSULTANTS
1221 Corporation Parkway, Suite 100 Since 1985 Tel: [phone]
Raleigh, North Carolina 27610 Fax: [phone]
e -mail: rgoldsteinOWGAcarolina.com website: www.RIGAcarolina.com
07 March 2013
US Army Corps of Engineers
3331 Heritage Trade Drive, suite 105
Wake Forest, NC 27587
NC Division of Water Quality
401 - Wetlands Permitting Unit
1650 Mail Service Center
Raleigh, NC 27699 - 1650107
Subject: NWP #13 PCN for Idols Dam river -bank stabilization, Yadkin River, Forsyth County
Dear US -ACE and NC -DWQ staff:
Attached is the PCN application (NWP -13) for the proposed river -bank stabilization project at
Idols Dam on the Yadkin River in southwestern Forsyth County NC. John Thomas of US -ACE
and Sue Homewood of NC -DWQ met with us on -site on 30 November 2010 to discuss the
project and verify the type and extent of jurisdictional waters. Since that time, the project has
changed, eliminating the proposed repair work on the southern (right) tailrace wall and the need
to cross the tailrace with construction equipment. The project as currently proposed includes: 1)
bank grading and stabilization upstream of the Idols Dam powerhouse (125 feet) with fabric,
gravel and rock fill, 2) bank grading and stabilization downstream of the Idols Dam powerhouse
(180 feet) with a concrete toe wall and rock backfill, and 3) mechanical excavation of sediment
and debris upstream of the gated spillway. The proposed impacts to waters are summarized as
follows:
Yadkin River pool
above Idols Dam
Grade & riprap along river -bank
Impounded river
0.032 ac, perm
Yadkin River pool
above Idols Dam
Excavate sediment & debris
Impounded river
0.068 ac, temp
Idols Dam Tailrace
Toe support wall, grade and
backfill with rock behind wall
Tailrace bypass
0.043 ac, perm
Total open water impacts = 0.075 ac perm, 0.068 acre temp
1 0.143 ac
An application fee check for $240 is enclosed with the PCN copies mailed to NC -DWQ. Please
email or call me at 919 - 872 -1174 if you need any further information for this PCN application.
Gerald Pottern, senior biologist
ggottern @RJGAcarolina.com
MAR 2 0 203 �
NEPA & SEPA Environmental Documents: EA, EIS, CE I Jurisdictional Wetland & Stream Buffer Delineations 1 404 - 401 Permits I CIS /CPS Mapping T"N&' J
Quality Studies 1 Stream & Wetland Mitigation and Restoration I Endangered Species Surveys I Biological Assessments & Conservation Plans 1 Water Intakes &
Reservoirs 1 Water Lines & Treatment Plants I Sewerlines & Wastewater Treatment I Instream Flow Analyses I Interbasin Transfer Certificates I Watershed
Assessment & Management I Archaeological Surveys and Testing 1 Phase 1 Site Assessments I Parks & Greenways Planning I CWMTF Grant Applications

mot WALe9
P t
Office Use Only:
Corps action ID no.
DWO project no.
Form Version 1.3 Dec 10 2008
Pre - Construction Notification (PCN) Form
Section A. Applicant Information
1. Processing
1 a. Type(s) of approval sought from Corps:
® Section 404 Permit ® Section 10 Permit
1b. Specify Nationwide Permit (NWP) number: NWP -13 or General Permit (GP) number:
1 c. Has the NWP or GP number been verified by the Corps?
® Yes: John Thomas ❑ No
1d. Type(s) of approval sought from the DWQ (check all that apply):
® 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit
❑ 401 Water Quality Certification — Express ❑ Riparian Buffer Authorization
le. Is this notification solely for the record
because written approval is not required?
For the record only for DWQ 401
Certification:
❑ Yes ® No
For the record only for Corps Permit:
❑ Yes ® No
if. Is payment into a mitigation bank or in -lieu fee program proposed for mitigation
of impacts? If so, attach the acceptance letter from mitigation bank or in -lieu
fee program.
❑ Yes ® No
1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below.
❑ Yes ® No
1 h. Is the project located within a NC DCM Area of Environmental Concem (AEC)?
❑ Yes ® No
2. Project Information
2a. Name of project:
Idols Dam Riverbank Repair
2b. County:
Forsyth County (USGS Quad = Advance NC)
2c. Nearest municipality / town:
3 miles SSW of Clemmons
2d. Subdivision name:
NA
2e. NCDOT, T.I.P. or state project no:
NA
3. Owner Information
3a. Name(s) on Recorded Deeds:
City of Winston - Salem, City /County Utilities Division
3b. Deed Book and Page No.
DB: 2309, page 3498
3c. Responsible Party (for LLC ):
David K. Saunders, P.E., Winston- Salem/Forsyth County Utilities Director
3d. Street address:
Winston -Salem City Hall, 101 North Main Street, Suite 357
3e. Mailing Address:
PO Box 2511, Winston - Salem, NC 27102 -2511
3f. Telephone no.:
336- 727 -8418
3g. Fax no.:
336- 727 -8432
3h. Email address:
[e-mail]
Page 1 of 11
PCN Form — Version 1.3 Dec 2008

4. Applicant Information (if different from owner)
4a. Applicant is: OWNER
❑ Agent ❑ Other, specify:
4b. Name:
Winston- Salem/Forsyth County Utilities, David Saunders, Director
4c. Business name:
See above
4d. Street address:
2. Surface Waters
4e. City, state, zip:
2a. Name of nearest body of water (stream, river, etc.):
4f. Telephone no.:
2b. Water Quality Classification of nearest receiving water:
4g. Fax no.:
2c. River basin:
4h. Email address:
5. Agent/Consultant Information (if applicable)
5a. Name:
Gerald Pottern (Environmental Consultant)
5b. Business name:
Robert J Goldstein & Associates, Inc.
5c. Street address:
1221 Corporation Pkwy, suite 100
5d. City, state, zip:
Raleigh, NC 27610
5e. Telephone no.:
919 - 872 -1174
5f. Fax no.:
919 - 872 -9214
5g. Email address:
Gpottern @RJGAcarolina.com
5h. Name:
Tom Fitzgerald, P.E. (Engineering Consultant)
51. Business name:
Schnabel Engineering
5j. Street address:
11 -A Oak Branch Drive
5k. City, state, zip:
Greensboro, NC 27407
51. Telephone no.:
336- 274 -9456
5m. Fax no.:
336- 274 -9486
5n. Email address:
[e-mail]
Section B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID):
Parcel 5881 -62- 1957.00
1b. Site coordinates (in decimal degrees):
Latitude: 35.9746 Longitude: - 80.3987
1c. Property size:
11.42 acres
2. Surface Waters
2a. Name of nearest body of water (stream, river, etc.):
Yadkin River
2b. Water Quality Classification of nearest receiving water:
Yadkin River above Idols Dam = WS -IV -CA
Yadkin River below Idols Dam = WS -V
2c. River basin:
Yadkin/PeeDee, DWQ: 03 -07 -02, USGS: 03040101
Page 2 of 11
PCN Form - Version 1.3 Dec 2008

3. Project Description
3a. Describe the existing conditions on the site and general land use In the vicinity of the project at time of this application:
Idols Dam consists of a 140 foot long concrete gated section on the left (north) side of the Yadkin River and a 420 foot long
ungated stone spillway on the right (south) side of the river. The dam supported a hydroelectric generating facility from
1898 until June 1998, when the turbines and powerhouse were destroyed by fire. The headrace and tailrace areas collected
sediment over the next several years, until flow through the tailrace was reduced to a trickle. In 2006 the turbines were
removed and the gated spillway was rebuilt with a 48" diameter sluice gate and three Obermeyer crest gates to restore flow
through the tailrace. A new roof was built on the powerhouse, and the remaining structures were stabilized to preserve their
historical value. The Winston- Salem/Forsyth County (City /County) water supply intake is located 350 feet upstream
(west) of the gated spillway on the north bank of the river. The raw water pump station building is 200 feet north of the
gated spillway. Idols Dam is necessary to provide sufficient hydraulic head for the intake to operate. The south- central
portion of the property around the powerhouse, intake, and pump station is mowed lawn, and the northern and eastern
portions of the property contain upland hardwood and pine forest. A railroad borders the western property line. Surrounding
land uses include forest, residences, and a golf course to the east.
High flow events during recent years have eroded the north river -bank upstream and downstream of the powerhouse
retaining wall. A pile of debris and sediment just upstream of the sluice gate appears to be contributing to the upstream
bank erosion by deflecting flow toward the bank. Further river -bank erosion may threaten the stability of the historic
powerhouse and operation of the City's raw water intake upstream. The tailrace channel has down -cut and undermined the
wall separating the tailrace from the main river channel, and a portion of the wall has collapsed 130 feet downstream of the
spillway gates. A narrow rocky island 700 feet long is downstream of the breached wall and separates the remainder of the
tailrace from the main river channel.
3b. List the total estimated acreage of all existing wetlands on the property:
There is no wetland in the vicinity of the powerhouse, dam, tailrace, intake, or pump station building where the proposed
construction and staging activities will occur, based on a field survey by RJG &A in April 2010. The Forsyth County Soil
Survey (1976, sheet 42) shows a drainage flowing southeastward across the northern portion of the property, with adjacent
Chewacla soils. RJG &A did not survey for wetlands along this drainage, which is beyond the areas that will be disturbed.
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
The City's 11.4 acre raw water intake property has approximately 800 feet of frontage along the northeast (left) bank of the
Yadkin River. The Forsyth County Soil Survey (1976, sheet 42) shows a drainage flowing southeastward across the
northern portion of the property, with adjacent Chewacla soils. The USGS Quadrangle (Advance, NC) shows a topographic
ravine in this area, but no blue -line stream. We did not examine this drainage to determine whether it is jurisdictional, as it
is beyond the areas that will be disturbed for this project. An existing culvert beneath the access road (150 ft northeast of
the pump station) conveys this drainage. The existing road and culvert will be adequate for project construction traffic.
3d. Explain the purpose of the proposed project:
The proposed repair work will stabilize the eroding river -bank segments upstream and downstream of the powerhouse, and
remove the debris/sediment in front of the sluice gate that is deflecting flow toward the bank. The previous plan to repair
the breached tailrace wall (discussed during the Nov 2010 field meeting with John Thomas and Sue Homewood) has been
cancelled, and no dewatering or temporary access road across the tailrace will be needed. The collapsed segment of tailrace
wall does not structurally threaten the rest of the dam, and no longer poses a hazard to boaters as it did in 2010 -2011. Water
now flows freely through this 40 -ft gap between the river and tailrace, and will be left as is.
Page 3 of 11
PCN Form — Version 1.3 Dec 2008

3e. Describe the overall project In detail, Including the type of equipment to be used:
1) Close the sluice gate and Obermeyer gates; river flow will be diverted over the stone spillway to the south. Install a turbidity
curtain to isolate the headrace area water where sediment excavation and upstream river -bank grading and stabilization will
occur. Using a long -arm excavator on shore, excavate the debris and sediment in front of the gates, and place the excavated
material (approximately 700 cu.yds) in the existing dredge dewatering containment area, a permanent structure used for
maintenance dredging in front of the raw water intake. The dredge dewatering area includes an adjacent sediment basin to
reduce turbidity before the runoff returns to the river. After dewatering, excavated material will be disposed of off -site in a
location to be determined by the contractor.
2) Grade the eroding river -bank segment upstream of the powerhouse (125 linear feet) with an excavator to a slope of 2HAV.
Place geotextile fabric, bedding gravel, and class 1 riprap to stabilize the slope. The toe of the reconstructed slope will follow
the natural pre- erosion contour of the river bed. The volume of fill material to be placed below OHWM along this segment of
river -bank is approximately 440 cu.yds. The open water area temporarily affected by sediment excavation and river -bank
stabilization work on the upstream segment is 0.20 acre, and the permanent fill area below OHWM is 0.032 acre.
3) Keeping the sluice gate and crest gates closed, install a turbidity curtain to isolate the left side of the upper tailrace where
downstream river -bank grading and stabilization will occur (180 linear feet). Cut and remove the lower portion of the old
masonry wall that has deteriorated and eroded, and construct a new concrete toe wall connecting to the powerhouse retaining
wall. Concrete poured in place it will be isolated from river water using cofferdams until it has cured. The wall will be
constructed on bedrock with reinforcing anchors drilled and grouted into the underlying rock. The wall will have a 2 foot top
width and railing. The back face of the wall will be battered while the front exposed face will be vertical. A drain will be
constructed behind the wall consisting of sand and gravel with a PVC collector pipe. Once the wall is in place the bank behind
the wall will be backfilled, graded, and armored with gravel and class 2 riprap similar to the upstream area. The volume of fill
material to be placed below OHWM along this segment of river -bank is approximately 300 cu.yds. The open water area
temporarily affected by river -bank stabilization work on the downstream tailrace segment is 0.10 acre, and the permanent fill
area below OHWM is 0.043 acre.
4) Remove the turbidity curtains and open the spillway crest gates to restore flow through the tailrace. Remove temporary
erosion control measures and re -seed the disturbed areas.
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
® Yes ❑ No ❑ Unknown
Corps or State been requested or obtained for this property /
project (including all prior phases) in the past?
John Thomas verified RJGA delineation in Nov 2010
4b. If the Corps made the jurisdictional determination, what type
® Preliminary ❑ Final
of determination was made?
4c. If yes, who delineated the jurisdictional areas?
Agency /Consultant Company:
Name (if known): Gerald Pottern, RJG &A
RJG &A Environmental Consultants
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
30 November 2010: RJG &A met on -site with John Thomas (ACE) and Sue Homewood (DWQ). Mr. Thomas confirmed
RJG &A's delineation of OHWM in the river and tailrace (open waters) and lack of wetlands in project construction area.
S. Project History
5a. Have permits or certifications been requested or obtained for
® Yes ❑ No E] Unknown
this project (including all prior phases) in the past?
5b. If yes, explain in detail according to "help file" instructions. A NWP -3 was issued in Sep 2005 (Action 1D 2004 - 21843)
by John Thomas for dredging and repair of the gated spillway section. This previous work was to restore flow through the
gated spillway (destroyed by the 1998 fire) and thus remove the sediment accreting near the raw water intake.
6. Future Project Plans
6a. Is this a phased project?
❑ Yes ® No
6b. If yes, explain.
Page 4 of 11
PCN Form — Version 1.3 Dec 2008

Section C. Proposed Impacts Inventory
1. Impacts Summary
la. Which sections were completed below for your project (check all that apply):
❑ Wetlands ❑ Streams - tributaries ❑ Buffers
® Open Waters ❑ Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted. > NONE
2a.
2b.
2c.
2d.
2e.
2f.
Wetland impact
Type of jurisdiction
number —
Type of impact
Type of wetland
Forested
(Corps - 404, 10
Area of Impact
Permanent (P) or
(if known)
DWQ — non -404, other)
(acres)
Tem ora
W1 ❑ P ❑ T
NA
NA
❑ Yes
❑ No
❑ Corps
❑ DWQ
W2 ❑ P ❑ T
NA
NA
❑ Yes
❑ No
❑ Corps
❑ DWQ
2g. Total wetland impacts
None
2h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a.
3b.
3c.
3d.
3e.
3f.
3g.
Stream impact
Perennial
Type of jurisdiction
Average
Impact
number - Permanent
Type of impact
Stream name
(PER) or
(Corps - 404,10
stream
length
(P) or Temporary (T)
intermittent
DWQ — non -404,
width
(linear
(INT)?
other)
(feet)
feet)
S1 ❑ P ❑ T
❑ PER
❑ Corps
❑ INT
❑ DWQ
S2 ❑ P ❑ T
❑ PER
❑ Corps
❑ INT
❑ DWQ
3h. Total stream and tributary impacts
None
3i. Comments: Although the project is in a river, John Thomas (ACE) determined that the work area is most appropriately
categorized as "open waters." The upstream river -bank repair and sediment removal area is impounded by the dam, and the
downstream river -bank repair work is within the tailrace and is thus part of the dam.
4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then individually list all open water impacts below.
4a.
4b.
4c.
4d.
4e.
Open water
Name of waterbody
impact number —
(if applicable)
Type of impact
Waterbody type
Area of impact (acres)
Permanent (P) or
Temporary
01 ®P ❑ T
Yadkin River pool
above Idols Dam
Grade & riprap along river -bank
Impounded river
0.032 ac
02 []POT
Yadkin River pool
above Idols Dam
Excavate sediment
Impounded river
0.068 ac
03 ® P ❑ T
Idols Dam Tailrace
Toe support wall, grade and
backfill with rock behind wall
Tailrace bypass
0.043 ac
4f. Total open water impacts
0.143 ac
Page 5of11
PCN Form — Version 1.3 Dec 2008

4g. Comments: Permanent fill below OHWM = 0.075 acre. Excavation = 0.068 acre.
5. Pond or Lake Construction
If Pond or lake construction Proposed, the complete the chart below.
5a.
5b.
5c.
5d.
5e.
Wetland Impacts (acres)
Stream Impacts (feet)
Upland
Pond ID
Proposed use or purpose of
acres
number
pond
Flooded
Filled
Excavated
Flooded
Filled
Excavated
Flooded
P1
P2
Sr. Total
None
5g. Comments:
5h. Is a dam high hazard permit required?
❑ Yes ® No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWO)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. if any impacts require mitigation, then you MUST fill out Section D of this form.
6a.
❑ Neuse El Tar-Pamlico ❑Other:
Project is in which protected basin? (Yadkin: No Buffers)
❑ Catawba ❑ Randleman
6b.
6c.
6d.
6e.
6f.
6g.
Buffer impact
number —
Reason for impact
Buffer
Zone 1 impact
Zone 2 impact
Permanent (P)
Stream name
mitigation
(square feet)
(square feet)
or Temp
required?
B1 ❑P ❑T
❑Yes
❑ No
B2 ❑P ❑T
❑Yes
❑ No
6h. Total buffer impacts
None
6i. Comments: Yadkin River, no DWQ buffers apply.
Section D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The river -bank repair work is limited to the areas of recent erosion upstream and downstream of the old Idols Dam powerhouse.
The eroding areas are non - forested, and adjacent forested river -bank segments upstream and downstream will be avoided.
Geotextile underlayment will help prevent soil from washing out through the bedding gravel and riprap on the upstream segment,
and the proposed wall improvements along the left bank of the tailrace will prevent slumping in that area. The previously proposed
repair work on the tailrace wall and temporary access road across the tailrace has been deleted from the project.
Page 6 of 11
PCN Form —Version 1.3 Dec 2008

Schnabel engineers used FHWA HEC -11 to design the size and thickness of riprap armoring to withstand the design storm. The
calculated average velocity in the channel for the 50 year storm based on hydraulic analysis is 3.14 m/s, and a conservative value of
4.0 m/s was used for calculations. Other design parameters used in the equation are: Davg (average flow depth) = 5.49 m, theta
(bank angle from horizontal) = 26.5 (2.5h:1v), phi (material angle of repose) = 40, and Kl (function of theta and phi) = 0.719. The
resulting d50 riprap diameter is 10.5 inches and thickness (2 times the d50) is 21 inches. The proposed design uses a 24 -inch thick
layer of class 2 riprap plus 6 inches of bedding stone, which exceeds the calculated minimum requirements based on HEC -I1.
1b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
The spillway crest gates and sluice gate will be closed and temporary turbidity curtains will be installed upstream and downstream
to isolate the standing water and contain turbidity throughout the sediment excavation, bank grading, wall construction, and riprap
fill activities, in accordance with NC Wildlife Resources Commission recommendations (Shari Bryant, pers com with Gerald
Pottern at RJG &A). A hydraulic dredge is not feasible for sediment removal due the amount of large materials mixed in, and thus a
long -arm excavator will be used. The excavated material will be dewatered on the river -bank using the existing sediment
dewatering containment area and overflow basin onsite, routinely used for dredging the water intake site. The intake is well
upstream from the work area and will be protected from re- suspended sediments by the turbidity curtain. Cleared areas will be
promptly revegetated with a groundcover seed mix.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for
Yes ® No
impacts to Waters of the U.S. or Waters of the State?
2b. If yes, mitigation is required by (check all that apply):
DWQ ❑ Corps
Mitigation bank
2c. If yes, which mitigation option will be used for this project?
Payment to in -lieu fee program
El Permittee Responsible Mitigation
3. Complete If Using a Mitigation Bank
a. Name of Mitigation Bank: NA
b. Credits Purchased (attach receipt and letter)
�ype NA
�uantity NA
c. Comments: NA
4. Complete If Making a Payment to In -lieu Fee Program
a. Approval letter from in -lieu fee program is attached.
Yes
b. Stream mitigation requested:
NA linear feet
c. If using stream mitigation, stream temperature:
El warm ❑ cool ❑cold
d. Buffer mitigation requested (DWO only):
NA square feet
e. Riparian wetland mitigation requested:
NA acres
f. Non - riparian wetland mitigation requested:
NA acres
g. Coastal (tidal) wetland mitigation requested:
NA acres
h. Comments:
5. Complete if Using a Permittee Responsible Mitigation Plan
If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan. NA
6. Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWO
Page 7 of 11
PCN Form — Version 1.3 Dec 2008

Will the project result In an Impact within a protected riparian buffer that requires
buffer mitigation?
Yes
® No
b. If yes, then identify the square feet of Impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
Zone
C.
Reason for Impact
6d.
Total impact
(square feet)
Multiplier
If yes, then is a diffuse flow plan included? If no, explain why.
6e.
Required mitigation
(square feet)
Zone 1
NA
NA
3 (2 for Catawba)
What is the overall percent imperviousness of this project?
NA
Zone 2
NA
NA
1.5
If this project DOES NOT require a Stormwater Management Plan, explain why:
NA
2d.
6f. Total buffer mitigation required:
2e.
NA
g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in -lieu fee fund).
�h. Comments:
3. Certified Local Government Stormwater Review
Section E. Stormwater Management and Diffuse Flow Plan (required by DWO)
1. Diffuse Flow Plan
la.
Does the project include or is it adjacent to protected riparian buffers identified
within one of the NC Riparian Buffer Protection Rules?
❑ Yes ® No
1 b.
If yes, then is a diffuse flow plan included? If no, explain why.
❑ Yes ❑ No
2. Stormwater Manage ent Plan
2a.
What is the overall percent imperviousness of this project?
NA %
2b.
Does this project require a Stormwater Management Plan?
❑ Yes ® No
2c.
If this project DOES NOT require a Stormwater Management Plan, explain why:
2d.
If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan:
2e.
Who will be responsible for the review of the Stormwater Management Plan?
❑ Certified Local Government
❑ DWO Stormwater Program
❑ DWO 401 Unit
3. Certified Local Government Stormwater Review
3a.
In which local government's jurisdiction is this project?
Forsyth County
3b.
Which of the following locally- implemented stormwater management programs
apply (check all that apply):
❑ Phase II
❑ NSW
❑ USMP
❑ Water Supply Watershed
❑ Other:
3c. Has the approved Stormwater Management Plan with proof of approval been
attached?
❑ Yes ❑ No
4. DWO Stormwater Program Review
Page 8 of 11
PCN Form — Version 1.3 Dec 2008

Section F. Supplementary Information
❑ Coastal counties
1a. Does the project involve an expenditure of public (federal /state/local) funds or the
❑ HQW
4a. Which of the following state- implemented stormwater management programs apply
❑ ORW
(check all that apply):
❑ Session law 2006.246
environmental document pursuant to the requirements of the National or State
❑ Other:
4b. Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑ No
attached?
S. DWO 401 Unit Stormwater Review
5a. Does the Stormwater Management Plan meet the appropriate requirements?
❑ Yes ❑ No
5b. Have all of the 401 Unit submittal requirements been met?
❑ Yes ❑ No
Section F. Supplementary Information
1. Environmental Documentation (DWO Requirement)
1a. Does the project involve an expenditure of public (federal /state/local) funds or the
® Yes ❑ No
use of public (federal /state) land?
1 b. If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State
❑ Yes ® No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1c. if you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
letter.)
❑ Yes ❑ No
Comments: This river -bank stabilization project does not require a SEPA document.
2. Violations (DWO Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards,
❑ Yes ® No
or Riparian Buffer Rules (15A NCAC 213 .0200)?
2b. Is this an after - the -fact permit application?
❑ Yes ® No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s): NA
3. Cumulative Impacts (DWO Requirement)
3a. Will this project (based on past and reasonably anticipated future impacts) result in
❑ Yes ® No
additional development, which could impact nearby downstream water quality?
3b. If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
This river -bank repair project will not induce urban growth or secondary and cumulative impacts.
4. Sewage Disposal (DWO Requirement)
Page 9 of 11
PCN Form — Version 1.3 Dec 2008

4a. Clearly detail the ultimate treatment methods and disposition (non - discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility.
This project will not generate sanitary wastewater.
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur In or near an area with federally protected species or
❑ Yes ® No
habitat?
5b. Have you checked with the USFWS concerning Endangered Species Act
® Yes ❑ No
impacts?
® Raleigh
5c. If yes, indicate the USFWS Field Office you have contacted.
❑ Asheville
5d. What data sources did you use to determine whether your site would Impact Endangered Species or Designated Critical
Habitat?
US -FWS and NC -NHP websites list three federally endangered or threatened species in Forsyth County: Small - anthered Bittercress,
Bog Turtle, and Red - cockaded Woodpecker. Small- anthered Bittercress occurs in seeps and similar wetlands not exposed to high
scouring flows. It does not occur on banks of large rivers, and there is no suitable habitat for this plant in the project area. Bog
Turtle occurs in fens, seeps, wet pastures and similar wetlands with soft mud, semi- permanent groundwater flow, and an open
canopy. It does not occur on banks of large rivers, and there is no suitable habitat for this plant in the project area. Red - cockaded
Woodpecker occurs in extensive tracts of mature pine- dominated forests with sparse hardwood understory. No suitable habitat for
any of these three species exists in the project area, and NHP has no record of these species within five miles of Idols Dam. Based
on lack of suitable habitat and lack of nearby records, biologist Gerald Pottern of RJG &A concludes that none of these species or
their designated critical habitat is likely to be affected by the project.
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat?
❑ Yes ® No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
NC -DMF and NC -WRC. There is no designated essential fish habitat in Forsyth County.
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation
® Yes ❑ No
status (e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
Idols Dam and the powerhouse are designated historic structures by SHPO and Forsthy County. SHPO provided a letter
(attached) concurring that the proposed stabilization work will not adversely affect the historic features of the site, and did not
recommend any further cultural resources investigations on the property prior to the repair work.
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA- designated 100 -year floodplain?
® Yes ❑ No
8b. If yes, explain how project meets FEMA requirements:
The project purpose is to stabilize the left bank of Yadkin River where erosion has occurred upstream and downstream of the Idols Dam
powerhouse retaining wall. The grading and fill work will restore pre - erosion contours and have negligible effect on river hydraulics or
flood elevations above or below Idols Dam. No CLOMR or other FEMA documentation is required for the proposed work.
Page 10 of 11
PCN Form — Version 1.3 Dec 2008

8c. What source(s) did you use to make the floodplain determination?
NC Floodplain Mapping Information System, FIRM map panel 5881.
Gerald Pottern
A4�w#*Z7
04 March 2013
Applicant/Agent's Printed Name
Applicant/Agents Signature
Date
(Agent's signature Is valid only If an authorization letter from the
applicant Is provided.)
ATTACHMENTS:
1. Agent Authorization Letter from Winston -Salem Forsyth County Utilities.
2. State Historic Preservation Office (SHPO) response letter, December 2010.
Figure 1. Location of Idols Dam project area on Yadkin River, USGS Topographic Quad: Advance NC.
Figure 2A. Idols Dam prior to 2006 repairs, showing sediment accretion in headrace and tailrace areas, and
original turbines exposed when the roof was destroyed by fire in 1998.
Figure 2B. Idols Dam in 2010, showing flow restored through new gates and tailrace, and current bank
erosion areas.
Figure 3. Idols Dam Riverbank Stabilization, proposed disturbance limits.
Figure 4. Idols Dam Riverbank Stabilization, proposed excavation and fill volumes and areas.
Figure 5A. Idols Dam Riverbank Stabilization, close -up of upstream repair segment.
Figure 5B. Idols Dam Riverbank Stabilization, close -up of downstream repair segment.
Figure 6. Typical profile of riverbank stabilization with geotextile fabric and riprap, 2H:1V.
Figure 7. Typical turbidity curtain design.
Page 11 of 11
PCN Form —Version 1.3 Dec 2008

winaP Seim • Forsyth CmM
e ounty �C�eS
wmr.sor.S*Wam ftoW February 28, 2012
udltda
Adminht udoft
Gerald Pottem, Senior Biologist
Chy.fWW.WO&s=
Robert J. Goldstein and Associates, Inc.
c o. Sa 25"
1221 Corporation Parkway, Suite 100
WimaW1%kS% NC 27102
Raleigh, North Carolina 27810
ary" 3j6.727A=
&x M&727.M2
--doe-WS
Subject: Idols Dam Improvements — Agent Authorization Letter
To Whom It May Concern,
This letter authorizes Robert J. Goldstein & Associates (RJG&A
Environmental Consultants) to serve as the City of Winston Salem's agent
for obtaining regulatory approval and environmental permitting for the
proposed Idols Dam Improvements project, located on the City of Winston -
Salem's property along the Yadkin River in southwestern Forsyth County.
RJG&A is authorized to take all actions necessary for the processing, issuance
and acceptance of required permits and /or certifications and any standard and
special permit conditions.
David K. maunders, P.E.
Utilities Director
tygCamd6 Mod ABeo JdnmC VMm tl. 8mla:, Mqv P�d'[smpae. No�md Waal RaheD. Adams Nmh Wliod+ Daa Baca Sow WL�k Rola� G (}+A. Wea Wiry
ICitylink 1�,� = =Mw& l VAAD=*laL
C�wn aaftatYwrMira Feby& -- C40mmm= Dwait. Myhf,1MdMMDdWOWJAVkOChftr W WdV .WdllaWA*MWAAGmsAWmmdw=amWWedan F
7 pdv.�pmgo Gomel N.nadfe, D„dlq mw h
• ravoaat
gnaw ..soars all
$e�mouG Seep6m d1• SDdtaw J 10 �oA Vice C�ah�pnom la6kTa�olm'iaj Bean Ha�oid R Halmrs �uln D. Je�wfl It. Pud S blc�.�9
s ands a sa®mtlea

North Carolina Department of Cultural Resources
State Historic Preservation Office
Peter B. Sandbeck, Administrator
Beverly Eaves Perdue, Governor
Linda A. Carlisle, Secretary
Jeffrey J. Crow, Deputy Secretary
December 22, 2010
Gerald Potten
Robert J. Goldstein and Associates, Inc.
1221 Corporation Parkway
Suite 100
Raleigh, NC 2 7610
Office of Archives and History
Division of Flratorical Resources
David Brook, Director
Re: Idols Dam Riverbank and Tailrace Repairs, Yadkin River, Forsyth County, ER 10 -2037
Dear Mr. Potten:
Thank you for your letter of October 28, 2010, concerning the above project.
As you are aware, the Idols Hydroelectric Plant has been determined eligible for listing in the National Register
of Historic Places. We have conducted a review of the project, which proposes to stabilize the northeast
riverbank (above and below the dam) and to stabilize the tailrace wall. We concur that the historic resource
will not be adversely affected. Therefore, we have no comment on the project as proposed.
Based on our knowledge of the area, it is unlikely that any archaeological resources that may be eligible for
inclusion in the National Register of Historic Places will be affected by the project. We, therefore, recommend
that no archaeological investigation be conducted in connection with this project
The above comments are made pursuant to Section 106 of the National Historic Preservation Act and the
above comments are made pursuant to Section 106 of the National Historic Preservation Act and the Advisory
Council on Historic Preservation's Regulations for Compliance with Section 166 codified at 36 CFR Part 800.
Thank you for your cooperation and consideration. If you have questions concerning the above comment,
please contact Renee Gledhill- Earley, environmental review coordinator, at 919- 807 -6579. In all future
communication concerning this project, please cite the above - referenced tracking number.
Sincerely,
Ln(Peter Sandbeck
Location 109 Lot Jones Street, lUc%h NC 27601 Mailing Address 4617 Mail Service Center, Raleigh NC 27699 -4617 Telephone /Paz (919) 807 - 6570/807 -6599

'1aa1000't = youi 0'l :areas
-ON aauenpd :a12ueapen'o aiydeagodol s9sn 'aani�j ui�pe,k uo eaae jaafoid wea slopi jo uoileaol .T a.inji j
�.
W e(]
SIOPI
lop
r
�t `• �� � y' ems. � � 1/ --�� /!
` l �'e °'»'*?7►- .�.:.- ._
`
It
,r

'seaae uoisoaa jueq jua.i.in:) pue 'a:)ealiel pue saleg nnau gOnoayl paaoisai mol} Ruimogs '010Z ui we(] slopl -8Z aan2i j
a2puq peoaliea ayl jo isea jsnf si ajejui aalem Aji0 a41 '866 ui aaij Aq p Aoa }sap seM looi aqj uagm pasodxa sauiganl
leul2iao pue 'seaae aoealiel pue a:)eapeaq ui uoilaa»e juawipas Ouimogs'sjiedai 90OZ of aoiad weQ slopl -VZ a.in2id

_T
UU
C
M
W
Q
O
tn
0 RAW WATER
N PUMP STATION
(D
1 171, f
/
/'' • ij't ' - 2.00 2+50
-. o.00 o+5a ,.ao 1-50 HEO
h' cu, fain - wnu
'A - SANDBAR
YADKIN RIVER
FLOW .0 .
Ab % YADKIN RIVER
3f00 3.503M0
X
+i
7
A
4
CIO �
00
disturbance
,A
O�
limits
�\
�aANrOallga
� t
its fl{
P p Station
m Drain
sod
imt{s 0.2,1 as
basin
IDOLS DAM
POWERHOUSE
-'
DREDGE �+00
4 �50f
DEWATERING
_____ WALL
Downstream Bank Repair 180 R
CONTAINMENT �1�'
SLUICE
i
GATE
4_r
temp. tutbift curtain
TAILRACE
Lu
1 171, f
/
/'' • ij't ' - 2.00 2+50
-. o.00 o+5a ,.ao 1-50 HEO
h' cu, fain - wnu
'A - SANDBAR
YADKIN RIVER
FLOW .0 .
Ab % YADKIN RIVER
3f00 3.503M0

M
UQ
C
(D
KA
-`sX.►
��
�ir� Wof �ii���1
CNN RA-11
IDOLS DAM
M Riot
POWERHOUSE
Downstream Bank Repair 180 It
SLUICE
GATE
Rock fill below OHWM
300 cu.yds, 0.043 acre
TAILRACE
0011,11, 4W
y$
1101 Nall riuj +Qw�O. , -
�1'p/
_.. - - --
Ilia Cl WALL

.• � I e rte. 8� ��: % /: %�,.
UPSTREAM SEDIMENT
REMOVED TO EL 885
Figure 5A. Idols Dam Riverbank Stabilization, close -up of upstream repair segment.
0
-•� .\ CLASS I RLPRAP SLOPE PROTECTION
SEE SHEET XXX FOR DETAILS `' ^
�- f "y •�.A, '1X'gy\'Y Y'n,�
' ,fin'• , �`' ti� �` y' ,` 4 `t. 1 L1 ���+[IYy [y•> ,,4 � r
!
�nY -pie ' },y , "' xprpyp r,, •' .I,h p•dlx{,, ,. •�Tk�, .�; ` .
N
;. .�'d',^+j� l.,t, rJ x� y.t�i �r'' r . a ')•• � T `,✓^ � '}L� ro'� } K` "4t � A
�' j ^%`L'.,,1;-,s''!pp �q t'Tn qu ��.r � }�Vt T � ; ' tii � �j �^ l • 4 0<�.9; 1. �. Rir��4'�'-i��' ;.�' • ���
�� "L:1�•'• r} Y x 7'1Y' 4C 5 Y'y�' r- a �.l` 'lr ; I ��``77����'.�... i� ;•a,l �]]}
l t��,; �, ,�ry .ft ` r`', , �+ ( •� '� ,Y_.` �Cld"}Y�. �1� v�.A.���._�'1..•• 3 K�....,. _ �
i,,,^ 7; • ''T K� � r � .K,�d � �s+`.. } �'t ��y > w l - '� f •r k y'��jt ►► �'Y > x-^.""'.w.` v-�.-
i
- LEFT TAILRACE CONCRETE WALL I ,
SEE SHEET XXX FOR DETAILS
I
i PROPOSEDLEFT 7AIRACE
� REPLACE ZD{F OF TS' lrit DIP
1 WALL TIE IN STA 1.56 SEE SHEET XXX FOR DETAILS
` \
Figure 5B. Idols Dam Riverbank Stabilization, close -up of downstream repair segment.

Figure 6. Typical profile of riverbank stabilization with geotextile fabric and riprap, 2HAV. (Drain pipe is for downstream
segment only; conveys return drainage from raw water pump station).

I
Y4' TIE ROPE
FOLDS FOR COMPACT STORAGE
DEPTH AS
NEEDED
J.- --- -�- - --
Figure 7. Typical turbidity curtain design
X
%' POLYPROPYLENE ROPE
FLOATATION
1 1 I I
I I I
III
III - - - - --
IT II I I I ALL SEAMS
HEAT SEALED
I I I III ECONOMY FABRICS AVAILABLE
- 180Z 300LB /IN STANDARD
NYLON REINFORCED VINYL
A* CHAIN
1 BARRIERS SHOULD BE A BRIGHT COLOR (YELLOW OR "INTERNATIONAL" ORANGE ARE RECOMMENOEU) THAT WILL ATTRACT
THE ATTENTION OF NEAR BY BOATERS.
2. THE CURTAIN FABRIC MUST MEET THE MINIMUM REQUIREMENTS NOTED BELLOW:
PHYSICAL PROPERTIES OF SILT CURTAIN FABRIC
THICKNESS, MILS
45
WEIGHT /OZ. /SO,YD.
TYPE I
18
TYPE II
18 OR 22
TYPE III
22
GRAB TENSILE STRENGTH. LBS 300
UV INHIBITOR MUST BE INCLUDED
3. THE SEAMS IN THE FABRIC SHALL BE EITHER VULCANIZED WELDED OR SEWN, AND SHALL DEVELOP THE FULL STRENGTH
OF THE FABRIC.
4. FLOTATION DEVICES SHALL BE FLEXIBLE. BUOYANT UNITS CONTAINED IN AN INDIVIDUAL FLOATATION SLEEVE OR COLLAR
ATTACHED TO THE CURTAIN. BUOYANCY PROVIDED BY THE FLOATATION UNITS SHALL BE SUFFICIENT TO SUPPORT THE
WEIGHT OF THE CURTAIN AND MAINTAIN A FREEBOARD OF AT LEAST 3- INCHES ABOVE WATER SURFACE LEVEL-
S. LOAD LINES MUST BE FABRICATED INTO THE BOTTOM OFF ALL FLOATING SILT CURTAINS. THE SUPPLEMENTAL (BOTTOM)
LOAD LINE SHALL CONSIST OF A CHAIN INCORPORATED INTO THE BOTTOM HEM OF THE CURTAIN OF SUFFICIENT WEIGHT
TO SERVE AS BALLAST TO HOLD THE CURTAIN IN A VERTICAL POSITION. ADDITIONAL ANCHORAGE SHALL BE PROVIDED AS
NECESSARY THE LOAD LINES SHALL HAVE SUITABLE CONNECTION DEVICES WHICH DEVELOP THE FULL BREAKING
STRENGTH FOR CONNECTING TO LOAD LINE IN ADJACENT SECTIONS.
6. EXTERNAL ANCHORS MAY CONSIST OF WOOD OR METAL STAKES (2 -X4 -INCH OR 2 )j-INCH MINIMUM DIAMETER WOOD OR
1.33 POUNDS/ LINEAR FOOT STEEL).
MAINTENAKE:
1. THE DEVELOPER /OWNER SHALL BE RESPONSIBLE FOR MAINTENANCE OF THE SILT CURTAIN FOR THE DURATION OF THE
PROJECT IN ORDER TO ENSURE THE CONTINUOUS PROTECTION OF THE WATERCOURSE.
2. SHOULD REPAIRS TO GEOTEXTILE FABRIC NECESSARY. THERE ARE NORMALLY REPAIR KITS AVAILABLE FROM THE
MANUFACTURERS; MANUFACTURERS INSTRUCTIONS MUST BE FOLLOWED TO ENSURE THE ADEQUACY OF THE REPAIR.
3. WHEN THE CURTAIN IS NO LONGER REQUIRED AS DETERMINED BY THE INSPECTOR, THE CURTAIN AND RELATED
COMPONENTS SHALL BE REMOVED IN SUCH A MANNER AS TO MINIMIZE TURBIDITY. REMAINING SEDIMENT SHALL BE
SUFFICIENTLY SETTLED BEFORE REMOVING THE CURTAIN. SEDIMENT MAY BE REMOVED AND THE ORIGINAL DEPTH (OR PLAN
ELEVATION) RESTORED, ANY SPOILS MUST BE TAKEN TO UPLAND AREA TO BE STABILIZED.