20140662 Ver 1_401 Application_20140614

1 1
2 0 1 4 0 6 6 2
WADAMS
LETTER OF TRANSMITTAL
To- Mrs Cherne Smith Date June 25, 2014
NC Division of Water Resources
Wetlands and Stormwater Branch
1650 Mail Service Center `' FEDERAL EXPRESS
Raleigh, North Carolina 27699
Re Duke Energy Progress - Garner Complex Job No DKE -14000
Preconstruction Notification
I am sending you the following item(s)
COPIES
DATE
NO.
DESCRIPTION
1
Permit Application Check $240
5 Sets
Preconstruction Notifications w/ Attachments
These are transmitted as checked below
❑ As requested
® For approval
❑ For review and comment
Remarks
❑ For your use
Copy to Signed,
George Buchholz, PV0 REM
Wetlands-Scientist
Raleigh- Durham Charlotte
2905. Meridian Parkway 11301 Carmel.Commons Blvd , Suite 111
Durham, North Carolina 27713 Charlotte, North Carolina
(919) 361 -5000 (704) 527 -0800
Designing Tomorrow's Infrastructure & Communities
McAdamsCoxom

OF WATF9
pG 1 4 O 6 Office Use Only:
2 O
y r 6 2 Corps action ID no.
1 1 > -
1 DWQ project no.
Form Version 1.4 January 2009
Nage 1 of 10
PCN Form — Version 1.4 January 2009
Pre - Construction Notification (PCN) Form
A.
Applicant Information
1.
Processing
1a
Type(s) of approval sought from the Corps:
X Section 404 Permit Section 10 Permit
1 b
Specify Nationwide Permit (NWP) number: 39 or General Permit (GP) number: 3890
1c
Has the NWP or GP number been verified by the Corps?
Yes X No
1 d
Type(s) of approval sought from the DWQ (check all that apply):
X 401 Water Quality Certification — Regular Non -404 Jurisdictional General Permit
401 Water Quality Certification — Express X 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:
X No
For the record only for Corps Permit:
X No
1f
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.
X No
1g
Is the project located in any of NC's twenty coastal counties. If yes, answer
1 h below.
X No
1h
Is the project located within a NC DCM Area of Environmental Concern (AEC)?
X No
2.
Project Information
2a
Name of project:
Duke Energy Progress - Garner Mechanical Boulevard Complex — NTA Yard
Expansion
2b
County:
Wake
2c
Nearest municipality / town:
Garner
2d
Subdivision name:
2e
NCDOT only, T.I.P. or state project no:
3.
Owner Information
3a
Name(s) on Recorded Deed:
Progress Energy Carolinas, Inc.
3b
Deed Book and Page No.
DB: 01422, PG: 0540 F�� —r� a�
3c
Responsible Party (for LLC if
applicable):
— —'^}
3d
Street address:
1414 Mechanical Blvd. J�Ijj
3e
City, state, zip:
Garner, NC 27529 �p,LITY
3f
Telephone no.:
919- 546 -3484 �-
3g
Fax no.:
919- 546 -4217
3h
Email address:
Nage 1 of 10
PCN Form — Version 1.4 January 2009

4. Applicant Information (if different from owner)
4a Applicant is
Agent X Other, specify
4b Name
Patrick O'Toole
4c Business name
(if,apphcable)
JLL -Duke Energy
4d Street address
1,1 Fayetteville Street
4e City, state, zip
Raleigh, NC 27601
4f Tel ephone,no
91'9- 546 -3571
4g, Fax no
919- 546 -4217
4h Email,address
Patrick O'Toole @duke- energy, corn
S. Agent/Consultant Info_ rmation (if applicable)
5a Name,
George Buchholz, Environmental Consultant/Project Manager
5b Business name
(if applicable)
The John R McAdams Company
5c Street,address
905 Meridian Parkway
5d City, state, zip-
Durham, NC,'27713
5e Telephone no
919- 287 -0890
5f Fax no
919- 361 -2269
5g Email address
buchholz @mcadamsco corn
Page,2 of,10

B. Project Information, and Prior Project History
1.
Property Identification
1a
Property identification no (tax.PIN or parcel ID)
1701977908000
lb
Site coordinates (in decimal, degrees) Latitude 35 7199 Longitude -78 6303
1'c
Property °size
691 acres
2.
Surface Waters
2a
Name of nearest body of water to proposed project
Wildcat Branch and Big Branch — Neuse Basin
Wildcat Branch Class C, NSW, 27 -34 -7
Wildcat Branch Class C, NSW, 27 -34 -7
Big Branch Class C, NSW,,27 -34 -11
2b
River'basin
Neuse Basin, HUC 03020201
3.
Project, Di:scription
3a
Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application Located on Mechanical Boulevard, just north of US Highway 70 and adjacent to the Norfolk- Southern
'Railroad, is the existing Duke Energy Progress Garner Mechanical Boulevard Complex Existing development on
this site,consists of'a variety of industrial facilities and infrastructure used to support Progress Energy, specifically
storage, repair, and other activities related to their electrical transformers There are'undeyeloped areas on the
property which would be characterized as maintained grass areas, scrub -shrub areas, and forested areas which
could be described as Dry-Mesic Oak -Hickory Forest and Piedmont Bottomland Forested according to the
Classification of °the Natural Communities of North Carolina (Schafle and Weakley, 31 approximation, 1990) Of
the•remaining forested areas on the property„ the two larger forested areas are located in the northwestern
section -and the extreme�northeastern sections of the property
3b
List the total estimated acreage of all existing wetlands on the property 0 148 acres
3c
List the total estimated linear feet of all existing streams (intermittent and perennial) on the property 950 linear feet
3a Explain the purpose of the proposed project, The purpose ofthe project is to, provide,expansion areas located
at the Garner Complex to accommodate the growth needs of the storage yard for both the Garner Transmission and
Garner Distribution Center
3b Describe the overall project in detail, including the type of,equipment to be used
Since the issuance•of NWP 18 (USAGE Action ID 201'000578, issued May 20, 2010) and 401 Water Quality
Certification and Neuse River Buffer Protection Rules Authorization (DWQ Project # 10 -0377, issued August 12, 2010),
it has become apparent additional space is required to accommodate the growth needs of the storage yard for both the
Garner Transmission and Garner Distribution Center Therefore, Duke Energy Progress is proposing to expand three
parking lot areas,located on the property to the maximum extent practical This project will include clearing and
grubbing ofthe existing wooded area, grading /expansion of the gravel yard, re- grading an existing tgravel' parking area,
installation of a new stormwater best management facility, along with relocation of existing lights and security fencing
that surrounds the perimeter of the existing yard The first parking lot expansion (Parking Expansion #1, Figure 4) is
located in the extreme northeastern section of the property adjacent to the Norfolk- Southern railroad, in which a gravel
parking lot area will be constructed The second parking lot expansion (Parking Expansion #2, Figure 4) is located in
the northwestern section of the property near the northern property boundary, in which a gravel parking lot area will be
constructed Parking Expansion #2 involves the expansion of,existing parking'area and extending it into an existing '
forested area that also contains an unnamed tributary to Wildcat Branch This expansion proposes to impact 94 5 lines
feet of'the unnamed tributary The jurisdictional stream is not applicable to the Neuse River Riparian Buffer Rules The
third parking lot expansion (Parking Expansion #3; Figure 4) is located in the northwestern section of the property near
the western property boundary, in which an existing gravel parking area, known as the Auction Yard, will be re- graded
and' paved Re- grading and paving will involve removing1he existing impervious gravel area encroaching into the
Neuse River Riparian Buffer that, is associated with an unnamed tributary to Wildcat Branch (Stream A and Linear
Wetland D, Figure 3, in accordance with DWR Project NBRRO# 10 -072 and USACE Ac`tlon 1ID- 204000578) The
existing impervious gravel area encroachment into the Neuse River Riparian Buffer occur prior to establishment of the
Neuse River Riparian Buffer Rules Paving of Parking Expansion #3 will occur outside the Neuse River Riparian Buffer,
while grading of the side slopes will occur within the Neuse River Buffer The newly graded side slopes will be
temporarily and permanently seeded Traditional equipment will be used, including front -end loaders, graders, and
earth movers

4. Jurisdictional Determinations
4a Have jurisdictional Wetland or stream determinations by the
X Yes
Corps or State been ,requested or obtained for this property
/ project (including all prior phases] in the past?
Comments
USACE Final Jurisdictional Determination (USACE
Action ID 201000578, issued May 20, 2010)
DWQ Neuse River Buffer Determination (DWQ Project
NBRRO # 10 -072, `issued April 20, 201`0)
4b If the Corps made the,junsdictional `determination, what
X Final
type of determination was made?
4c If yes, who delineated the jurisdictional
Agency /Consultant Company
areas? Name (if known) George Buchholz
McAdams Co
Other
4d' If'yes, list the dates of the Corps jurisdictional determinations or State determinations ,and attach documentation
USACE Signed JD,Plat Final Jurisdictional Determination (USACE Action ID 20,1000578 „issued May 20, 2010 by Raleigh
Field Office — Mr Tyler Crumbley)
DWQ Neuse River Buffer Determination (DWQ Project NBRRO,# 10 -072, issued April 20, 2010 by Mr Martin Richmond)
S. Project History
5a Have permits or certifications been requested or obtained
X Yes No
for this project (including all prior phases) in the past?
5b If yes, explain in detail according to "help file” instructions NWP 18 issued by USACE on 05/20/2010 (Raleigh Field Office
— Mr Tyler Crumbley, Action ID 20100578), 401 Water Quality Certification (GC 3821) and Neuse River Buffer Authorization
issued on 08/12/2010 to impact 0.012 acres of wetland for the construction of,a stormwater management facility,(DWR — Ms
Coleen Sullins DWR Project #10 -0377)
6. Future Project'Plans
6a Is this a phased project?
Yes X No
6b If yes, explain
Page 3 of 10
PCN Form —Version 1 4 January 2009

C. Proposed Impacts Inventory
1. Impacts Summary
1 a 'Which sections were completed below for your project (check all that apply)
Wetlands X Streams — tributaries X 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
2a
2b
2c
2d
2e
2f
Wetland impact
Type of impact
Type of wetland
Forested
Type of jurisdiction
Area of
number
Corps (40.4,10) or
impact
Permanent (P) or
DWQ (401, other)
(acres)
Temporary'(T)
W1
W2
2g Total Wetland Impacts:
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
Type of impact
Stream name
Perennial (PER) or
Type, of
Average
Impact
number
intermittent (INT)?
jurisdiction
stream
lenp
Permanent (P) or
width
@near
Temporary (T)
(feet)
feet)
S1 Permanent
Fill
Unnamed Tributary"to
Wildcat Branch
Intermittent
X Corps
1 5 feet
94 5'
S2
3h Total stream and tributary impacts
945
31 Comments
Page 4 of 10
PCN Form — Version 1 4 January 2009

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 in ividually list all open water impacts below
4a
Open water
impact number
Permanent (P) or
Temporary (T)
4b
Name of waterbody
(if applicable
4c
Type of impact
4d
Waterbody
type
4e
Area of impact (acres)
01
02
,03
04
4f Total open water impacts
Ag Comments
5. Pond or Lake Construction,
If pond or lake construction proposed, then, complete the chart below
5a
Pond ID number
5b
Proposed use or
purpose of pond
5c
Wetland Impacts (acres)
5d
Stream Impacts (feet)
5e
Upland
(acres)
Flooded
Filled
Excavated
Flooded
Filled
Excavated
P1
P2
5f Total:
5gComments
5hls a dam high hazard permit required?
Yes No If yes, permit ID no
51 Expected pond surface area (acres)
51 Size of pond watershed (acres)
5kMethod of construction
6. Buffer Impacts (for DWQ)
If project will impact,a protected riparian buffer, then complete the chart below If yes, then individually list all buffer
:impacts below If an impacts require mitigation, then ou MUST fill out Section D of this form
6a Project is in which protected basin?
Neuse Tar - Pamlico Catawba Randleman Other
6b
Buffer Impact
number —
Permanent (P),or
Temporary (T)
6c
Reason for impact
6d
Stream name
6e
Buffer
mitigation
required?
6f
Zone 1
impact
(square
feet )
6g
Zone
impac
(square
feet
B1 Permanent
Grading
Unnamed Tributary to Wildcat Branch
No
137
3745
B2 -
-B3
B4
B5
B6
6h Total Buffer Impacts:
137
3745
Page 5 of 10

Comments
ar"king Expansion #3 involves the re- grading and paving of amexisting gravel parking area, known as the Auction Yard Re-
rading and paving will involve removing the existing impervious gravel area encroaching into the Neuse,River Riparian Buffer,,
aving a parking,area outside the Neuse River Riparian Buffer, grading side slopes into the Neuse River Riparian Buffer and
stablishing a pervious.area within the Neuse River Riparian Buffer
roposed grading impacts to Neuse River Riparian Buffers total 137 ftz in Zone 1 and 3,745 ftz in Zone 2 No impervious
irfaces are proposed as part of grading into the Neuse River Riparian Buffers All impacted Neuse River Riparian Buffers .
euse River Riparian Buffer areas will be temporarily and permanently seeded, and'therefore, a new pervious will be establis
ithin the Neuse River Riparian Buffer

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 project is
'located on an existing maintenance /warehouse facility operated by Duke Energy Progress The majority of the property
is developed and used for maintenance and storage operations of transformers and substations utilized by Duke Energy
Progress Issuance of "the,previous NWP 18 and GC 3821 in 2010 was a result of impacts associated with the construction
of a stormwater management,facility,so that the property could be brought up to the standards of NCDENR -DWR and the
Town of Garner stormwater management regulations Locating the stormwater management facility on the, property was
difficult due to existing natural resources areas (i a streams, wetlands, and Neuse River Riparian Buffers)'located on the
property and the limited areas suitable for a stormwater management facility Develop- ment°potential of the'property has been
nearly maximized Since the issuance °of the previous'NWP1 8 and GC 3821 it has become apparent additional space is
required to accommodate the growth needs of the storage�yard'for both the Garner Transmission and Garner Distribution
Center Therefore, Duke Energy is proposing to expand three parking lot areas,located on the property to the maximum extent
practical As a result, unavoidable impacts to existing streams and Neuse,River Riparian Buffer areas are proposed
Minimization efforts in the form of removing existing impervious gravel parking areas within the Neuse River Riparian Buffer
and replacing it with a pervious graded slope will occur at Parking Expansion #3
1 e Specifically describe measures taken to.avoid or minimize the proposed impacts through construction techniques Proper
sedimentation and erosion control methods will be utilized during construction in accordance with the NC Division of Land
Quality guidelines, and as approved by °the Town of Garner A level spreader will be constructed dust outside the Neuse River
Riparian Buffer 'in order to promote diffuse flow (0 29 cfs during 10 year storm) into the buffer All new grading activities will be,
confined within the project limits located on the property All work will take place during dry conditions and can be facilitated
from high, non - jurisdictional, stable ground The contractor shall install silt fence, inlet protection, sediment traps, diversion
ditches, tree protection, clearing only as necessary All erosion and sediment control measures will be checked for stability and
operation following every`runoff producing rainfall, but in no case less °than once every week Any needed repairs will be made
immediately to maintain all measures designed An erosion control'inspections report is required and will be kept by the
owner's representative Temporary seeding and permanent seeding plans are included to restore impacted areas
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a Does the project require Compensatory Mitigation for
X No
impacts -to Wat_ers,of the U S or Waters of the State?
2blf yes, mitigation is required,by (check all that apply)
DWQ Corps
Mitigation bank
2c If yes, which mitigation option will be used for
Payment to in -lieu fee program
this project?
Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a Name of Mitigation Bank
Type
Quantity
3b Credits Purchased (attach receipt and letter)
Quantity
Type
Quantity
3c Comments
4..Complete if Making a Pa ment.to In -lieu Fee,PrO ram
4a Approval letter'from in -lieu fee program is attached -
4b Stream mitigation requested
linear feet
4c If using stream mitigation, stream temperature
4d Buffer mitigation requested -(DWQ only)
square feet
4e Riparian wetland mitigation requested
acres
4f ,Non - riparian wetland mitigation requested
acres

4g Coastal (tidal) wetland mitigation requested
acres
4h Comments
5. Complete if Using a' Permittee ResponsibleWitigation Plan
5a If using a permittee responsible mitigation plan, provide,a description of the proposed mitigation plan
Page 6 of 10
PCN Form — Version 1 4 January 2009

6. Buffer Mitigation (State Regulated Riparian Buffer Rules):— required by DWQ
6a Will the project result in an impact within a protected riparian buffer that
X No
requires`buffer mitigation?
6b If yes, then identify the square feetlof impact to,each zone of the riparian buffer that requires mitigation Calculate the
amount of mitigation,required_
6c
6d
6e
Zone
Reason for impact
Total impact
Multiplier
Required mitigation
(square feet)
(square feet)
Zone 1
-3 (2 for'Catawba)
Zone 2
1 5
6f
6g 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)
6h Comments At this time, the applicant does not propose compensatory buffer mitigation since it is believed that -the impacts
associated with the proposed parking lot expansion at Parking Expansion #3 (see attached Figure 4 and Inset 2) will
enhance the existing encroached upon Neuse River Riparian Buffer Paving of Parking Expansion #3 will occur outside the
Neuse River Riparian Buffer, while grading of the side slopes will occur within the Neuse River Buffer The newly graded
side slopes will be temporarily and permanently seeded Therefore, a new pervious graded slope will be established at
Parking Expansion #3
Page 7 of 10

EE. Stormwater Management and Diffuse Flow Plan (required by DWQ)
1. Diffuse Flow Plan
1 a Does the project include or is,it adjacent to protected riparian buffers
X Yes No
identified within one of,the NC Riparian Buffer Protection Rules?
1 b If yes, then is a diffuse flow plan included? If no, explain why
X Yes No
2. Stormwater Management Plan
2a What is the overall percent imperviousness of this project?
899%
2b Does this project require a Stormwater Management Plan?
X Yes No
2c If this `protect 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
Proposed development on this site will be,subject to the stormwater management requirements set fort h in the Town of Garner
Stormwater Program for Nitrogen Control Per Town of Garner regulations, stormwater management on this site shall address
two primary issues (1) peak discharge rates and (2) water quality management
2e Who will be responsible for the review of the Stormwater Management Plan?
Certified Local Government
3. Certified Local -Government Stormwater Review _
3a In which local, government's jurisdiction is this project?
own of Garner
Phase II
3b Which of °the following locally - implemented stormwater management'programs
X NSW
apply (check all that apply)
USMP
Water Supply Watershed
Other=
3c Has the approved Stormwater Management Plan with proof of approval
X No The Stormwater
been attached
Management Plan is
being reviewed by the
Town of'Garner
4. DWQ Stormwater Program Review
Coastal counties
,H Q'W
4a Which of" the following state - implemented stormwater management programs
O R,W
apply (check all that apply)
X Session' Law
2'006 -246
-
O t h e_r
4b Has the approved Stormwater Management Plan with proof of approval
X No The Stormwater
been attached
Management Plan is
being reviewed by'the
Town of Garner
S. DWQ 401 Unit'Stormwater Review
5a Does the Stormwater Management Plan meet the appropriate requirements'
X Yes No
5b Have all of the 401 Unit submittal requirements been met?
X Yes No
Page 8 of 1`0
PCN Form — Version 1 4 January 2009

F. Supplementary Information
1. Environmental Documentation (DWQ - Requirement)
la Does the project involve an expenditure of public (federal /state /local) -funds `or
Yes X No
the use of public (federal /state) land?
lb If you answered "yes" to the above, does the project require, preparation of
an environmental document pursuant to the requirements of the National or
Yes No
State (North Carolina) Environmental Policy Act (NEPA/SEPA)?
1;c 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
2. Violations (DWQ 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
Yes X No
Standards, or Riparian Buffer Rules (15A NCAC 2B 0200)?
2b Is this an after - the- fact,permit,application?
Yes X No
2c If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s)
3. Cumulative Impacts (DWQ Requirement)
3a Wdl'this project (based on past and reasonably anticipated future impacts) result
in additional development, which could impact nearby downstream water quality?
Yes X,No
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 &short.narrative description The proposed project is a
single and complete project and confined within the property boundary Appropriate land use control measures °will be in
place for areas which will require them
4. Sewage Disposal (DWQ Requirement)
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 Waste water will be directed into an existing
Town of Garner maintained sewer line
Page 9�of 10
PCN Form — Version,1 4 January,2009

5 Endangered Species and Designated Critical Habitat (Corps Requirement)
5a Will this project occur in or near an area with federally protected species
X Yes No
or habitat?
5b Have you checked with the USFWS concerning Endangered Species
Yes X No
Act'impacts?
5clf yes, indicate the USFWS Field Office you have contacted
5d What data sources did you use to determine whether your site would impact Endangered Species or Designated
Critical Habitat? The USFWS web page (http / /www fws gov /endangered /) and the Natural Heritage virtual workroom
(http / /www ncnhp org /web /nhp /nhp- maDwiewer) were accessed on JuneA, 2014 to determine if the project would
impact Endangered Species,or Designated Critical,Habitat Based on this research, the dwarf wedgemussel
(Alasmidonta heterodon — E), Michaux's sumac (Rhus michauxii — E), and red - cockaded woodpecker (P►coides
borealis - E) are federally listed species that occur in Wake County Based on field inspections, it is believe'd that no
adverse impacts to threatened and endangered species and their known habitat will occur due to the construction of
the proposed project
6. Essential Fish Habitat (Corps Requirement)
6a Will this project occur in or near an area designated as essential fish habitat9
Yes X No
6b What data sources did you use to determine whether your site would impact Essential Fish Habitat? An interactive map
called the Essential Fish Habitat (EFH) Mapper (http //www habitat noaa gov /protection /efh /efhmapper /) was accessed on
June 4, 2014 to determine if the project will impact Essential Fish Habitat
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a Will this,prolect occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation
Yes X 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 ?,A review of the North Carolina State Historic Preservation Office'interactive map, which shows the locations
of properties and districts in Wake County, North Carolina,entered in the National Register of'Histonc Places
(http / /gis ncdcr gov /hpoweb /) was conducted on June 4, 2014 It did not reveal any,listing,within'the project area It is
believed the proposed project wilb not occur'in or near an area that has, been designated as having historic or cultural
preservation status by the state, federal, or tribal governments
8. Flood Zone Designation (Corps Requirement)
8a Will this project occur in a FEMA= designated 100 -year floodplain?
Yes X No
8b If yes„ explain how project,meets FEMA2requirements
8c What source(s) did you use to make the floodplain determination? North Carolina Flood Insurance Rate,Map
Panels 1701 and 1711 (June 5, 2014), Map Numbers 3720170100J and 3720171100J) do not show 100 -year flood
areassorfloodways located,ori the subject property
Applicant/Agent's Printed Name
Applicant/Agent's Signature
Date
(Agent, signature is,valid only if an, authorization
letter from the applicant is provided
Page'10 of 10

WA
V &V
,\c�
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
April 27, 2010
George Buchholz
EcoEngineering
Post Office Box 14005
Research Triangle Park, NC 27709
Dee Freeman
Secretary
NBRRO# 10 -072
Wake County
BASIN:
® Neuse (15A NCAC 2B .0233) ❑ Tar - Pamlico (15A NCAC 2B.0259)
® Ephemeral /Intermittent/Perennial Determination ❑ Isolated Wetland Determination
Project Name: Progress Energy Mechanical Blvd Complex
Location/Directions: Property is located on north side of Mechanical Blvd, west of Old Garner
Road in Wake County; MRCS Wake County Sheet 69; USGS Lake
Wheeler
Subject Stream: UT to Walnut Creek
Date of Determination: April 20, 2010
Feature
E/1 /P*
Not
Subject
Subject
Stu rt @,
stop*
Stream
I Form Pts.
Soil
Survey
USGS
Topo
A
I
X
Flag Al
Flag 'Start
Perennial
X
A
P
X
Flag 'Start
Perennial'
X
B
I
X
Fla B I
C
1
X
Fla C 1
Wetland C
D
P
X
Outfall
X
E
X
X
F
X
X
•+�•�• uYncmwus�iinp gtNtcirul C/C /I /O U!
Explanation: The feature(s) listed above has or have been located on the Soil Survey of Wake County, North
Carolina or the most recent copy of the USGS 'Topographic map at a 1:24,000 scale. Each feature that is checked
"Not Subject" has been determined not to be a stream or is not present on the property. Features that are checked
"Subject" have been located on the property and possess characteristics that qualify it to be a stream. There may be
other streams located on your property that do not show up on the maps referenced above but, still may be
considered jurisdictional according to the US Army Corps of Engineers and /or to the Division of Water Quality.
North Carolina Division of water Quality Raleigh Regional Office Surface Water Protection
Internet www.rimaterquality org 1628 Mail Service Center Raleigh, VC 27699 -1628
An Equal Opportunity /Affirmative Acbon Employer - 50% Recycled /1036 Post Consumer Paper
Phone [phone] Customer Service
FAX [phone]

Progress Energy Mechanical Blvd Complex
Wake County
April 27, 2010
Page 2 of 2
This on -site determination shall expire five (5) years from the date of this letter. Landowners or affected parties that
dispute a determination made by the DWQ or Delegated Local Authority may request a determination by the
Director. An appeal request must be made within sixty (60) days of date of this letter or from the date the affected
party (including downstream and /or adjacent owners) is notified of this letter. A request for a determination by the
Director shall be referred to the Director in writing c/o Ian McMillan, DWQ Wetlands /401 Unit, 2321 Crabtree Blvd.,
Raleigh, NC 27604 -2260.
If you dispute the Director's determination you may file a petition for an administrative hearing. You must rile the
petition with the Office of Administrative Hearings within sixty (60) days of the receipt of this notice of decision. A
petition is considered riled when it is received in the Office of Administrative Hearings during normal office hours.
The Office of Administrative Hearings accepts filings Monday through Friday between the hours of 8:00 am and 5:00
pm, except for official state holidays. To request a hearing, send the original and one (1) copy of the petition to the
Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, NC 27699 -6714. The petition may also be
faxed to the attention of the Office of Administrative Hearings at (919) 733 -3478, provided the original and one (1)
copy of the document is received by the Office of Administrative Hearings within five (5) days following the date of
the fax transmission. A copy of the petition must also be served to the Department of Natural Resources, c/o Mary
Penny Thompson, General Counsel, 1601 Mail Service Center, Raleigh, NC 27699 -1601.
This determination is final and binding unless, as detailed above, you ask for a hearing or appeal within sixty (60)
days.
The owner /future owners should notify the Division of Water Quality (including any other Local, State, and Federal
Agencies) of this decision concerning any future correspondences regarding the subject property (stated above). This
project may require a Section 404/401 Permit for the proposed activity. Any inquiries should be directed to the
Division of Water Quality (Central Office) at (919) -733 -1786, and the US Army Corp of Engineers (Raleigh
Regulatory Field Office) at (919 )-876-8441.
Respectfully, /
Martin Ri mond
Environ ental Specialist
cc: Wetlands` Stormwater Branch, 2321 Crabtree Blvd, Suite 250, Raleigh, NC 27604
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PROGRESS ENERGY
GARNER COMPLEX
©EcoEngineering
A division of710JoltRsecne.m.c�v�r,
• LNVINON1t8NTAL
X FILENAME: MID09010X.DWG
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1,000'
ENGINEERS • PLANNERS • SIJRVBY0R5
WETLAND DELINEATION
RCa)IeTRe I P uftW, AhRKN•Cu N AC e t1M013
DATE: 03 -31 -10
GARNER/ NORTH CAROUNA
ewe]] - sae••""°"^*°' •1*° F.:c -ew

U.S. ARMY CORPS OF ENGINEER'S
WILMINGTON DISTRICT
Action ID 20'1000578 County Walce USGS Quad- NC -Lake Wheeler
GENERAL PIERMIT (REGIONAL AND NATIONWIDE)
l'ioperty Owner / Authorrtcd Agent Progress Enemy
Address! Gavle Lanier-
14,14 Mechanical Blvd.
Garner, NC 27529
Telephone No: 919 - 219 -1596
V l�/(Dql U
MAY 2 4 2010 �
- --M -O
Size and location of properly (water body, road name /number, town, etc.): Property consists of 67:94 acres along
Mechanical Blvd. in Garner. NC: Site is mostly develoneci wi'th vnmmnrri ,wl 1v,,iti..— n...l —,� I -- ....,...., s•...._
Watershed hI'UC: 63020201; Coordinates in Decimal Degrees are: 35 7232786 N and -78.6338028 W
Description of pi opcts area and activity: 'I'Itis authorizatiolt is for the construction of a stormwater many eutent
facility (treatment pond) to collect stormwater runoff from the western half of the proii,erty wiflt minor impacts t6
wctbiuds A-and-B. The proicet,mnst be-conducted in accordance with the - applications and drawings submittetl on
14 MAY 2010.
Applicable Law ® Section 404,(Clean Water Act, 33 USC 1344),
[j Section 10 (Rivers and I-laibors Act, 33 USC 403)
AuthoricaUoii- Regional General Pei mitNumber
Nationwide Permit Number 18
Summary of Ayuthoi ircd imnarte 01111 T2nnnirn.l
Action lD
_ #
NWP/GP
# _
- --
Open Watcr, ac �__
-- ---- .--- - ..... ...............,.......emu.,.,..
Wetland (ac)
_
Unun tint Steam 1f)
__
lm ortant,Sticam (If)
Tempoiaty
Permanent
fei pormy
Permanent
Temporary
Permanent
Temporary
Permanent
201000578
18
- --
-- - --
0.012
hn act,Totals
0.012
�—
- -
_ Total Loss of Watels oft-he U.S ac 0.012
Total Loss of Waters,of --the U.S. (I_f),
Required Wetland Miti gation ac N/A
Required Stream Mitigation (Ifs_
Youi work is author ized.by the above referenced permit provided it is accomplished in strict accordance with the attached ,
conditions and youi submitted plans. Any violation of the,attaclled conditions or deviation fi om your submitted plans may subject the
permittee to a stop work order,a restoiahon oi,der and /or appiopr�rate legal action,
This verification is valid until the NWP is modified, reissued, or revoked All of the existing,NWPs are scheduled'to be modified,
reissued, or revoked prior to Maich 18, 2012. It is incumbent. upon you to remain informed Ofchangcs.to the NWPs. We will issue a
public notice when the NWPs are reissued Furthermore, if you commence or are under contract to commence this activity befoie the
date that the relevant nationwide,peimit is modified or revoked, you will have'twelve,(12),months from the date of the modification or
revocation of the NWP to complete the activity under the present terms and conditions ofthis nationwide,permit.
Activities subject to Section 404 (as indicated above) may also requiman individual Section 401 Water Quality Certification. You
should contact the NC Division of Water Quality (telephone.[phone]) to determine Section 401 i equirements
For activities Occurring within the twenty'coastal counties subject to regulation undei the Coastal Aiea Management Act (CAMA),
prior to beginning work you must contact the N C Division of Coastal Management
This Department of die Army verification does not relieve the permittee of the responsibility to obtain any other required Federal,
State or local approvals/pei mats.
If there are any;questions regarding this vei ificauon, any of the conditions of the Per mit, or the Corps of Engineers regulatory
program, please contact Mr Tyler Crumbley at 919 -554 -4881 ext 27
Page I of 3

Corps Regulatory Official — - - Date. 05/20 /2010
Expiration Date of Vewfication 03/18/2012 _
The Wilmington District is committed'to pioviding the highest level of support to the public 1`o help us ensuie �ve.contuiuc,to do so,
please complete the Customer Satisfaction Survey located at our webwe at http / /reQulato13, Lis aeesui veX com/ to complete the survey
online.
Page 2 of 3

Determination of Jurisdiction:
❑ Based on pie lnninary infonnation, there appear to be waters of the US including wetlands within the above described project mica
This preluninary determination is not an appealable action under the'IZegulatory Program Administrative Appeal Process
( Reference 33 CFR Pai t 33 J)
❑ ']'here are Navigable Waters of the United States within the above described project area subject,to the permit tequnements of
Section 10 of the Rivers and Flaibois Act and Section 404 of the`Clean Water Act Unless thete is a change in the law of out
published regulations, this determination may be iched upon for a pei rod not to exceed five years from the date ofthis
notification
® i'Inete ate waters of the US and/or wetlands within the above described project area Subject to,the permit requirements of,Section
404 of the Clean Water Act-(CWA)(33 USC § 1344) Unless there is a change in the law or out publislnecl,iegulattons; this
determination may be relied upon for a period not to exceed five years fiom the,date of this notification.
❑ 'f he jurisdictional areas °within the above described project area have been identified tinder alprevious action. 111'ease refei once
jurisdictional detei ininatioa issued . Action ill _
Basis of Jut isdictional Determination.- Wetland areas on this site exhibit the cuiteria as described in the 1987 Corns Wetland
Delineation Manual. Streams exhibit indicators of-an O11WM and internuttent to perennial flow and at e UTs to Wildcat
Branch.
Appeals Information (Thus information applies only to approved jurisdictional determinations.)
Attached to llhis veti(ication,is an' tippioved' jurisdictional,deterinin<ttioii 11-you are not to agieement with thatxappioved,jtnaisdictional
cleteiinination, yoij;can make art admtnisuative- appeal under 33 CFR,33'I Enclosed you will find a Notification of Appeal Process
(NAP) fact sheet anti request fbr appcal.(Rl7A) foinn If you request to appeal this determination,you must submit a completed RFA
form to (lie following address
Disti ict Engineer, Wilmington Regulatory Division
Attn• l'ylcr Crumbley, Picjcct Managet,
Raleigh Regulatory Field Office
3331 1 let itage Made Drive, Suite 105
WakeFotcst,,Noith Carolina 27587
In oiler for an RFA to be accepted by the Corps, the Coips must detetnune that it is complete, that it meets the ei Melia 1161 appeal
undei 33 CFR part 331 5, -and that it has been received by the Disti ict Office within 60 days of the clate,of the NAP Should you
decide to submit an'RFA fain, it must be received at the above address by IS JUL 10.
* *It is-not necessary,to,submit an RFA form to the Disti ict O ice ifyou do not object to the detetni'mation in this cot respondence
Corps Regulatory Official
Date 05/2012010 Expuation Date 05/20/2015
SURVEY PLA I -S, MELD SKE`CCI1, WETLAND DLt,INEATION FORMS', 1'ROJIiC "1' PLANS, LTC ,MUST' l3 Ls
ATTACHED'TO THE FiLE COPY Of THIS FORM, IF REQUIRED OR AVAILABLE.
Copy Fui nished.
Geotgc Buchholc, l.co Engineering
Page 3 of`3

Beverly Eaves, Perdue
Governor - _
FlikA
North Carolina Department of Environment and
Division of Water Quality
Coleen,H Sullins
__Director _
August 12, 2010
Ms. Gayle S. Lanier, Vice President Corporate Services
Project Energy Corporate,Services
P.O. Box 1551
Raleigh, NC 27602 -1551
Natural Resources
Dee�Freeman
Secretary
DWQ Project # 10 -0377
Wake County
Subject Property: Progress Energy — Garner Mechanical'Boulevard Complex
Wildcat Branch [030402, 27 -34 -7, C, NSW]
Approval of 401 Water Quality Certification and Authorization Certificate per the Neuse River
Buffer Protection Rules (15A NCAC 2B.0233) with Additional Conditions
Dear Ms. Lanier:
You have our approval, in accordance with the attached conditions and those listed below, to place fill
within or otherwise impact 0.012 acres of 404%wetland, and 0.00 square feet of Zone 1 Neuse River'basin
protected riparian buffer, and 0.00 square feet of Zone 2 Nedse'River basin protected riparian buffer, as,
described in your-application dated,May 6, 2010, and received by the;Division of Water Quality (DWQ)
on May 14, 2010, with additional information received on May 28,1010, and.July 9, 2010, to construct
the proposed stormwater management facility at the site. After reviewing your application, we have
decided that the impacts,are covered by General Water Quality Certification Number(s) 3821 (GC3821).
The Certification(s) allows you to use Nationwide Permit(s) NW 18 when issued by the US Army Corps
of Engineers (USACE). In addition, you should obtain or otherwise comply with any other required,
federal, state or local permits before you go.ahead with your project including (but not,limited to) Erosion
and Sediment Control, and Non- discharge-regulations. Also, this approval to proceed with your
proposed impacts or to conduct impacts to waters as depicted in your application shat! expire upon
expiration of the 404 or CAMA Permit.
This approval is for the purpose and design that you,described in,your application. If you change your
project, you must notify us and you may be required to send us a new application. If the property is sold,
the new owner must be given a copy of this Certification and approval letter and is thereby responsible for,
complying with all conditions. If total, fills for this project (now or'in the future) exceed one acre of
wetland or 150'linear feet of stream, compensatory mitigation may be required,as described in 15A,
NCAC 2H .05,06,(h): This approval,requires you to follow the conditions listed in the,attached
certification and any additional conditions listed below.
The Additional Conditions of the Certification are:
1. Impacts Approved
4010versighVExpress Review Penn" Unit
1650 trial Service Center, Ra"h, North Carolina 276991650
Location 2321 Crabtree Blvd. Surte 250, Ralergh. North Carolina 27604
Phone 919 - 733 17661 FAX [phone]'
Intemet httpIportal ncdenro9WebWgANs
An Equal Opp rturiq 1 Affirmative Action Employer i

Carolina Power and Light (Progress Energy)
Page 2 of 4
August 12,1010
The following impacts are hereby approved as long as all of the other specific and general
conditions of-this Certification -(or- Isolated Wetland- Permit) are,met. No other impacts-are
approved including incidental impacts:
of Impact Amount Approved nits Plan Location or Reference
404/Wetland 0:012 acres PCN' application page 5of 12
Buffers�,Zone ,l O.W uare ft. PCN application page 6 of 12
Bu4V._'7one 2 _.,0.00 uare ft. PCN application vase 6 of 12
2. No Waste, Spoil, Solids, or Fill of Any -Kind
No waste, spoil, solids, or fill of any kind,shall occur in wetlands, waters, or ripariawareas beyond
the footprint of the impacts depicted in the Pre - Construction Notification. All construction,
activities, including the design, installation, operation, and maintenance of sediment,and erosion
control Best Management Practices, shall be performed so that no violations of state water quality
standards, statutes, or rules occur.
3. Erosion and,sediment control,practices -must be in full compliancewith,all specifications governing
the, proper. design, installation -and operation and maintenance of such Best Management'Practices in
order to.protect surface waters standards:
a. The erosion and sediment control measures,for the,project must be designed, installed,
operated, and maintained, in,accordance with the,most recent version of the North Carolina
Sediment and Erosion Control Planning and Design Manual.
b. The design, installation, operation, and maintenance of the sediment and erosion control
measures must be such that they equal, or exceed, the requirements specified in the most
recent version of the North Carolina Sediment and Erosion Control Manual. The devices
shall, be maintained on all construction sites, borrow sites, and waste pile (spoil) projects,
including contractor -owned or leased borrow pits;associated with,thetproject.
c. Sufficient materials required for,stabilization and/or repair of erosion control measures and
stormwater routing and treatment shall be on site at all times.
4. Sediment and Erosion Control Measures
Sediment,and erosion control measures shall not be placed in wetlands or waters without prior
approval from the Division. If placement of sediment and erosion control devices in wetlands and
waters is unavoidable, design and placement of temporary erosion control' measures shall' not be
conducted,in a manner thaf,may result in dis- equilibrium of wetlands or stream beds or banks,
adjacentto or upstream and down stream of the above structures. All sediment and erosiowcontrol
devices shall be removed and the,natural grade restored within fwo�(2) months,of the date that the
Division of Land Resources oflocally delegated program has released the project;
5. Protective Fencing
The outside buffer, wetland or water boundary and along the construction corridor within these
boundane&approved under this authorization shall be clearly marked with orange warning fencing
(or similar high, visibility material) for the areas that have been approved to infringe within the
buffer, wetland or water prior to any land,disturbing activities;

Carolina Power and Light (Progress Energy)
Page 3 of 4
August 12, 2010
6. Diffuse Flow (DWQ Reviewed`Plans)
AlIstormwater shall-be directed,as diffuse flow at non- erosivvvelocities through the - protected
stream buffers and will not re-concentrate before discharging into the stream as identified within
15A NCAC 2B .0233(5)
In an, effort to comply with the diffuse flow provision of the Buffer Rule (15A NCAC 02B
.0233(5)), you have provided the DWQ,with level spreader (or bioretention) designs dated May 3,
2010, and received by the DWQ on July'9, 2010. The DWQ believes that ifimplemented, as per
these plans, diffuse,flow will be achieved. However, if diffuse flow as per 15A NCAC 02B
.0233(5) is not achieved, then °the DWQ shall be notified and corrective actions to restore diffuse
flow,shall be taken if necessary to, impede the,aformation.of erosion gul lies: At•no time shall
stormwater from the proposed development be -piped directly through the buffer without prior
DWQ written authorization.
The Operation &c Maintenance (O&M) agreement(s) for the,proposed level spreader signed by
Gayle Lanier onJuly 2, 201,0 (date) must transfer with the sale of the land or transfer of
responsibility for the stormwater facilities. DWQ must be notified promptly of every transfer.
The, structural stormwater practices as approved by this Office as well as drainage patterns,must
be maintained in,perpetuity. No changes to the structural, stormwater practices;shall be,made
without written authorization from the Division of Water Quality. Stormwater easements shall be
recorded for a distance ofat least 10 feet on each, side of all stormwater conveyances, and on all
lots containing these structures including future access for maintenance. The stormwater
easements,shall allow for the ability to maintain the structures, perform corrective actions as
described above and' shall provide protection of the structures from potential alternations by
future property owners.
7. Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification or applicable
Buffei'Rules, and any subsequent modifications, the applicant'is required to return the attached
certificate of completion to the 401 Oversight/Express Review Permitting Unit, North Carolina
Division of Water Quality, 1650 Mail Service Center, Raleigh, NC, 27699 -1650.
Violations of any condition herein set forth may result in,revocation,of this Certification and may result in
criminal and/or civil penalties. The authorization to proceed with your proposed impacts or to conduct
impacts to waters as depicted in °your application and as authorized by,this Certification, shall expire upon
expiration of the 404 or CAMA Permit.
If you wish to contest,any statement in the attached Certification you must file a petition for,an
administrative hearing. You may obtain the petition form from the Office of Administrative Hearings.
You must file the petition with the Office of Administrative Hearings within sixty (60) days -of receipt of
this -notice. A,petitio&is,considered filed,when it is received in,the Office of Administrative Hearings
during normal office hours. The Office of Administrative Hearings accepts filings Monday through
Friday between the'hours of 8:00am and 5:OOpm, except for official state holidays. The,original and one
(1) copy of the petition must be filed with the Office.of Administrative Hearings.
The petition may be faxed- provided the original and one copy of the document is received' by the Office
of Administrative Hearings within five (5) business,days following the faxeditraminission.
The mailing,address for the Office of Administrative Hearings�is:

Carolina Power and, Light (Progress Energy)
Page 4 of 4
August 12, 2010
Office of Administrative Hearings
67.14 Mail Service Center
Raleigh, NC 27699 -6714
Telephone: [phone], Facsimile: (919) -431 -3100
A copy of the,petition must also be served on DENR as follows:
Ms. Mary Penny Thompson, General Counsel
Department of Environment and Natural Resources
1601 Mail Service Center
Raleigh; NC 27699 -1601
Unless such a,petition is filed, this Certification shall be final and binding.
This letter completes the review of the Division ofWater Quality under'Section 401 of 'the Clean Water
Act and, the Neuse-riparian buffer protection rule as describedwithin 15A NCAC-2B .0233. If you have
any questions, please telephone,Ian McMillan or Amy'Chapman at 919 - 733 - 1.786.
CHS/Um
Enclosures: GC382 -1
Certificate,of Completion
4e6xen
cc: USACE Raleigh,Regulatory Field Office
Lauren Witherspoon, DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
George Buchholz, Ecoengineering, A Division of John R, McAdams Company, Inc.,
2905 Meridan Parkway, ,Durham, NC 27713
Filename- 100377ProgressFnergyGamerMechamcalBlvdUmplex (Wake)401_NBR

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USAGE PRELIMINARY -L-Ri5virTIONAL DETERMINATION
(ACTION ID 201005"18 APRIL 13 2010)
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The John R McAdams
Company, Inc.
Raleigh,/ Durham, NC
2905 Meridian Parkway
Durham, North Carolina 27713
(919) 361 -5000
Charlotte, NC
11301 Carmel Commons Blvd,
Suite 111
Charlotte North Carolina 28226
(704) 527 -0800
J McADAMS
June 23, 2014
Mrs. Cherrie Smith
NC Division of Water Resources
Wetlands and Stormwater Branch,
1650 Mail Service, Center
Raleigh, North Carolina 27699
Re: Pre - Construction, Notification — GC 3890 & Neuse Buffer
Authorization Request
Duke Energy Progress — Garner Mechanical Boulevard Complex —
NTA Yard Expansion
Garner, Wake County, North Carolina
DKE44000
Dear Mrs. Smith:
On behalf of Duke Energy Progress; McAdams is submitting a
Preconstruction Notification for approval of 401 Water Quality General
Certification 3890 and authorization certificate per the Neuse River Buffer
Protection Rules associated with the proposed construction of Parking
Expansion Areas located on the Duke Energy Progress — Garner Mechanical
Boulevard Complex. The Duke Energy Progress — Garner Mechanical
Boulevard Complex is located on Mechanical Boulevard„ just north of US
Highway 70 in Garner, North Carolina within Wake County. The project
proposes to impact 94.5 linear feet of intermittent stream, which was issued a
Final Jurisdictional Determination Plat on May 20, 2010 (US'ACE' Action ID:
201000578; Raleigh Field Office — Mr. Tyler Crumbley). In addition, the
project proposes to impact 1347 square feet of Zone 1 and 3,745 square feet of
Zone 2 of the Neuse River Riparian Buffers. However, it should be noted that
the proposed impacts to the Neuse River Riparian Buffers will result in the
removal of existing impervious encroachments within the Neuse River
Riparian Buffers associated with a gravel area that was constructed prior to
establishment of the Neuse River Riparian Buffer Rules and replacing the
encroachments with pervious areas associated with graded side slopes for a
paved parking area. No additional impacts to waters of the U.S. or Neuse
River Riparian Buffers are proposed. Please find enclosed for your review the
following items:
- Signed Agent Authorization
- Figure 1 - USGS Quad — Northwest Durham
- Figure 2 - Durham County Soil Survey (sheets # 20/21)
-Final Jurisdictional Determination Plat (USACE Action ID:
201000578; issued May 20, 2010 by Raleigh Field Office — Mr.
Tyler Crumbley)
McAdamsCo com Designing Tomorrow's Infrastructure & Communities

J McADAMS
Mrs. Cherrie Smith
Duke Energy Progress — Garner Mechanical Boulevard Complex — NTA Yard'
Expansion
June, 23, 2014
Page 2 of 6
=DWQ Neuse Rive r Buffer' Determination ,(DWQ Project NBRRO #:
10 -072; issued 'April 20, 2010 by Mr. Martin Richmond)
-NWP 18 issued by USACE on 65/20/2010 (Raleigh Field Office —
Mr Tyler Crumbley, Action ID: 20100578)
-401 Water Quality Certification issued by DWR on 08/12/2010 (Ms.
Colleen Sullins, DWR Project #10- 0377)
- Pre - Construction' Notification
- Figure 3.1 — Existing Conditions Map
- Figure 3.2 — Existing Conditions Map with aerial
- Figure 4 — Proposed Impact Map (Overall Site Plan)
-Inset 1 — NTA Yard Expansion/Parking Expansion W2
-Inset 2 — NTA Yard Expansion/Parking Expansion #3
- Courtesy Copy of Stormwater Management Plan
PROJECT HISTORY:
Mr. 'Tyler- Crumbley (USACE'— Raleigh Field _Office) visited the property on
April 12, 20,10 and confirmed the limits of jurisdictional features as part of the
jurisdictional determination process. Based on the field confirmations, there
were 940 linear feet of jurisdictional streams and 6,969 square feet (0.16
acres) of jurisdictional wetlands located on the property. A Final
Jurisdictional Determination Plat was issued May 20, 201'0 by the USACE
(USACE Action ID: 201000578). In addition, a Neuse River Buffer
Determination Letter was issued on April 27, 2010 (NCDWQ NBRRO# 10-
072) by Martin Richmond. A Pre - Construction Notification was submitted
requesting authorization, of 0.012 acres of wetland impact under Nationwide
Permit (NWP) #18 for the construction of a stormwater management facility
located within the western section of the property. A NWP 18 was issued by
the USACE on May 20, 2010 by Mr. Tyler Crumbley (USAGE Action ID:
20100578). In addition, a 401 Water Quality Certification was issued by
DWR on August 12, 2010 (DWR Project 410- 0377). Therefore, since the
construction of the stormwater management facility has occurred, the total
amount of existing waters of the U.S. on the property has changed to 940
linear feet of jurisdictional streams and 6,316 square feet (0.148 acres) of
jurisdictional wetlands.
PROPOSED PROJECT:
Since the issuance of the May 20, 2010 NWP 18, it has become apparent
additional space is required to accommodate the growth needs of the storage
DKE =14000

'J McADAMS
Mrs. Cherrie Smith
Duke Energy Progress— Garner Mechanical Boulevard Complex — NTA Yard
Expansion
June 23„ 2014
Page 3 of 6
yard for both the Garner Transmission and, Garner Distribution Center.,
Therefore, Duke Energy Progress is proposing to expand three parking lot
areas located on the property to the maximum extent practical This project
will include clearing and grubbing of the existing wooded area,
grading /expansion of the gravel yard, re- grading an existing gravel parking
area, installation 'of a new stormwater best management facility, along with
relocation of existing lights and security fencing that surrounds the perimeter
of the `existing yard. The first parking lot expansion (Parking Expansion fl,
Figure 4) is located in the extreme northeastern section of the property
adjacent to the Norfolk-Southern railroad, in which a gravel parking lot area
will be constructed. The second parking lot expansion (Parking Expansion
#2, Figure 4), in which a gravel parking lot area will be constructed, is located
in the northwestern section of the property near the northern property
boundary. Parking Expansion #2 involves the expansion' of existing parking,
area and extending it into an existing forested area that also contains an
unnamed tributary to Wildcat Branch. This expansion proposes to impact
94.5 linear feet of the unnamed tributary. The jurisdictional stream is not
applicable to the Neuse River Riparian Buffer Rules. The third parking lot
expansion (Parking Expansion #3, Figure 4) is located in the northwestern
section of the property near the western property boundary. ' Parking
Expansion #3 involves the re- grading and paving of an existing gravel parking
area known as the Auction Yard. Re- grading and paving will _involve
removing the existing impervious gravel area that is encroaching into the
Neuse River Riparian Buffer associated with an unnamed tributary to Wildcat
Branch (Stream A and Linear Wetland D, Figure 3; in accordance with DWR
Project NBRRO## 10 -072 and USACE Action ID• 201000578). The existing
impervious gravel area encroachment into the Neuse River Riparian Buffer
occurred prior to establishment of the Neuse River Riparian Buffer Rules.
Paving of Parking Expansion 43 will occur outside the Neuse River Riparian
Buffer;, while grading of the side slopes will occur within the Neuse River
Buffer. Removal of existing impervious encroachments within the Neuse
River Riparian Buffers and replacing the encroachments with pervious areas
associated with graded side slopes will occur within 137 square feet of Zone 1
and 3,745 square feet of Zone 2 of the Neuse River Riparian Buffer. The
newly graded side slopes will be temporarily and permanently seeded.
Therefore, a newly formed pervious area located within the Neuse River
Buffer is proposed as a result of re- grading and paving associated with
Parking Expansion #3.
DKE -14000

'J McADAMS
Mrs. Cherrie Smith
Duke Energy Progress — Garner Mechanical Boulevard Complex — NTA Yard
Expansion
June, 23, 2014
Page 4 of'6
Impact Table
Notes
* Involves the removal of existing impervious encroachments within the Neuse River Riparian Buffers and
replacing the encroachments.with pervious areas associated with graded,side'slopes for a�paved parking area.
Stormwater Management
Proposed development on the Duke Energy Progress — Garner Mechanical
Boulevard Complex property will be subject to the stormwater management
requirements set forth in the Town of Garner Stormwater Program for
Nitrogen Control. Per Town of Garner regulations, stormwater management
on this +site shall address two primary issues: (1) peak,discharge rates and (2)
water quality,management.
AVOIDANCE & MINIMIZATION:
The project is located on an existing maintenance /warehouse facility operated
by Duke Energy Progress. The majority of the °property ,is developed and used
for maintenance and storage, operations of transformers, and substations
utilized by Duke Energy Progress. Issuance of the previous NWP 18 and GC
3821 in 2010 was a result of impacts associated with the construction of a
stormwater management facility ,so that the property could be brought up to
the standards of NCDENR -DWR and the Town of Garner stormwater
management regulations. Locating'the stormwater management facility on the
property was difficult due to existing natural resources areas (i.e. streams,
DKE -14000
Previously Authorized
Proposed Impacts
Combined Total Impactsat
Impacts,(USACE Action
for NTA Yard
Duke Progress Energy —Garner
ID: 201000578)
Expansion
Mechanical Boulevard Complex
Stream
0
94 5 Linear Feet
94 5 Linear Feet
Impact:
Wetland
0 012 Acres
0
0 012 Acres
Impact:
Open Water
0
0
0
Impact:
Neuse River
Riparian
01
137 Square Feet*
137 Square Feet*
Buffer: Zone I
Neuse River
Riparian
0
3,745 Square Feet*
3:745 Square Feet*
Buffer: Zone 2
Notes
* Involves the removal of existing impervious encroachments within the Neuse River Riparian Buffers and
replacing the encroachments.with pervious areas associated with graded,side'slopes for a�paved parking area.
Stormwater Management
Proposed development on the Duke Energy Progress — Garner Mechanical
Boulevard Complex property will be subject to the stormwater management
requirements set forth in the Town of Garner Stormwater Program for
Nitrogen Control. Per Town of Garner regulations, stormwater management
on this +site shall address two primary issues: (1) peak,discharge rates and (2)
water quality,management.
AVOIDANCE & MINIMIZATION:
The project is located on an existing maintenance /warehouse facility operated
by Duke Energy Progress. The majority of the °property ,is developed and used
for maintenance and storage, operations of transformers, and substations
utilized by Duke Energy Progress. Issuance of the previous NWP 18 and GC
3821 in 2010 was a result of impacts associated with the construction of a
stormwater management facility ,so that the property could be brought up to
the standards of NCDENR -DWR and the Town of Garner stormwater
management regulations. Locating'the stormwater management facility on the
property was difficult due to existing natural resources areas (i.e. streams,
DKE -14000

'Jl McADAMS
Mrs. Cherrie ,Smith
Duke Energy Progress — Garner Mechanical Boulevard Complex — NTA Yard
Expansion
June 23, 2014
Page 5 ,of 6
wetlands, and Neuse River Riparian Buffers) located on the property and the
limited areas suitable for a stormwater management facility,. Development
potential of the property has been nearly maximized. Since the issuance of the
previous NWP 18 and GC 3821 it has become apparent additional space is
required' to accommodate the growth needs of'the storage yard for both the
Garner Transmission and Garner Distribution Center. Therefore, Duke
Energy Progress"is proposing to expand three parking lot areas located on the
property to the ,maximum extent practical. As a result, unavoidable impacts to
existing streams and Neuse River Riparian Buffer areas are proposed.
Minimization efforts in the form of removing existing impervious' gravel
parking areas within the Neuse River Riparian Buffer and ,replacing it with a
pervious graded slope will occur -at Parking, Expansion #3;
SUMMARY:
A NWP 18 was previously issued in 2010 in which, 0.012 acres of
jurisdictional wetlands were impacted for the construction of a stormwater
management facility on the Duke Energy Progress - Garner Mechanical
Boulevard Complex. Since 2010, it has become apparent additional space is
required to accommodate the growth needs. Therefore, three parking lot areas
are proposed for expansion on the property to the maximum extent practical.
Of the three parking lot expansion areas, Parking Expansion #2 involves the
expansion into an existing forested area that also contains an unnamed
tributary to Wildcat Branch This expansion proposes to impact 94.5 linear
feet of the unnamed tributary. The jurisdictional stream is not applicable to,
the Neuse River Riparian Buffer Rules. Parking Expansion #3 involves the
re- grading and paving of an existing gravel parking area known as the Auction
Yard. Parking Expansion 03 involves the removal of existing impervious
encroachments within the Neuse River Riparian Buffers associated with a
gravel area that was constructed prior to establishment of the Neuse, River
Riparian Buffer Rules and replacing, the encroachments with pervious areas
associated with graded side slopes for a paved parking area. Removal of
existing impervious encroachments within the Neuse River Riparian Buffers
and replacing the encroachments with pervious areas associated with graded
side slopes will occur within 137 square feet of Zone 1 and 3,745 square feet
of Zone 2 of the Neuse River Riparian Buffer. At this time, the applicant does
not propose compensatory buffer mitigation since it is believed that the
impacts associated with the proposed parking lot expansion at Parking
Expansion #3 (see attached Figure 4 and Inset 2) will enhance the existing
encroached upon Neuse River - Riparian Buffer. Paving of Parking Expansion
DK&14000

! I I
U1 McADAMS
Mrs. Cherrie Smith
Duke Energy Progress — Garner Mechanical Boulevard Complex — NTA Yard
Expansion
June 23, 2014
Page �6 of 6
#3 will occur outside the Neuse River Riparian Buffer; while grading of the
side slopes will occur within the Neuse River Buffer. The newly graded side
slopes will be temporarily and permanently seeded. Therefore, a new pervious
graded slope will be established at Parking Expansion #3. The proposed
project is a single and complete project and confined within the property
boundary. Appropriate land use control measures will be in place for areas
which will require them. Additional impacts to streams and wetlands located
on the property are not proposed.
At this tune„ we are requesting approval that the proposed construction
.activities associated with ,Parking Expansion Areas located on the Duke
Energy Progress — Garner Mechanical Boulevard Complex are authorized
under 401 Water Quality General Certification 3890 and the Neuse River
Buffer Protection Rules. Consideration of this project is greatly appreciated.
If you should have any questions or require additional information, please do
not hesitate .to contact me at (919) 287 -0890.
Sincerely,
The John R. McAdams Company, Inc.
C
George Buchholz, REM,,P7roject Environmental Consultant/ Manager
Attachments: Listed above
DKE -14000

PROJECT x0. DKE -14000
N TA YARD
EXPANSION
11
me
etLExAne: DKE14000X.DWG
.7 SCALE:
1° = l,000'
Dllll m North Ca1227713
n DATE.
PRE—CONSTRUCTION NOTIFICATION
MCADAMS
733-5646M '°`°M'°
��) • � .�
06 -23 -14
GARNER, NORTH CAROLINA

PROJECT NO. DKE -14000
N TA YARD
I= JOHN_ V. McfaAM
a Fiv"de: DKE14000X.DWG
uoc
EXPANSION
o SCALE: 1" = 1,000'
D�uham., North Glo029 27713
PRE - CONSTRUCTION NOTIFICATION
(S,7 5N °M�
yl DATE: 06 -23 -14
GARNER, NORTH CAROLINA
MCADAMS

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EXISTING STREAM FEATURE C
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DATE 06 -16 -2014 lIL' RNER * ORrH CAROLINA

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EXISTING 30' ZONE 1 NEUSE RIPARIAN BUFFER
EXISTING 20' ZONE 2 NEUSE RIPARIAN BUFFER
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137 S.F 0.00 AC.
PROPOSED 20' ZONE 2 NEUSE RIPARIAN BUFFER IMPACT
3,745 S.F 0.09 A.C.
GRAPHIC SCALE
50 0 25 50 100
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PROJECT NO. DKE -14000 NTA YARD EXPANSION ��
17� J0t91 R 11aAL1Al!
jr,"�tE• Of,7li�ANY, II!G UKE14D00 —INSET 1 INSET 2 �„5 N ;7la SCALE: r ao.: c -ossa 1„ = 50' PARKING EXPANSION #3 ,.17��• M�Adameco.c=
DATE: 06 -16 -2014 GARNER, NORTH G'AROI.INA CADAMS

NTA YARD EXPANSION — GARNER MECHANICAL BLVD., COMPLEX,
Final Stormwater Management Pldn7
GENERAL DESCRIPTION
Located on Mechanical Boulevard, just north ,of US Highway-"70 and adjacent to, the Norfolk -
'Southern Raifroad, is the existing Duke Energy Progress, Garner Mechanical Boulevard
Complex. Exi'st'ing development on, this site consists of a variety of industrial facilities and
infrastructure used to support Progress Energy; specifically `storage, repair, and other activities
related to their ,electrical transformers. At this' time, there is the proposed expansion of the
exisiingNTA gravel yard, which is part of Phase 3',as referred to in previous reports.
The improvements proposed on this site are contained within three (3) phases. Phases 1 and 2
have already completed, at this time. The improvements Within each phase are as follows:
Phase I
■° Grading ihrprovewents of portions of the existin g gravel yards at the. NTA facility and
adjacent to the eastern most entrance off of Mechanical Boulevard
Internal site storm drainage improvements
Removal �of the; existing west pond and filhng the area for existingydrd expansion,
Construction of a new,stormivater management facility (Pond #1)
Renovation,of an existing, "non- stormwater management" pond'(Pond #2)
Renovatiomof an existing, ,approved,stormwater management facility (Pond' #,3)
Phase 2
Internal traffic improvements consisting of an, improved en'trance,to the western grcrvel yards
and two (2),proposedaccess, drivesbet veen: the main facility and the NTA yard
P_ hase 3 '_
Construction .of, an expansion of the existing NTA gravel yard to, the northeast and the
addttton of a, rdil spur to the , adjacent Norfolk- Southern,,railroad
'This si'te� is located within the Neuse River basin,, with the southern portion of the ,site, inside the
Lake Benson watershed protection district. Stormwater runoff from the north side of the site
drains into unnamed tri'butari'es of Walnut Creek and Big Branch Creek. 'The southern portion of
the site (Subbasins #3 and #4) drains, toward 'Mechanical Boul'evard', which drains to unnamed
,tributaries that eventually drain to Lake Benson:, Please refer to the included watershed maps
provided for pre= 'and post - development (Chapters 5 and `6). Proposed development on this site
(,i.e,. Phase 1 stormwater ,improvements; Phase 2 traffic improvements, land Phase 3 expansion)
will be subject to the stormwater management requirements set ,forth in the Town of Garner
Stormwater Program for Nitrogen Control. Per Town of 'G'arner regulations,, stormwater
management, ion this site shall address two primary issues: (f)' peak discharge rates, and (2) water
quality management.
t
1. Exceprin .certain situations stormwater detention, will be required on new projects The design
standard for detention will 'be based ,upon peak, flow reduction to pre- development (existing)
�condrtrons for the ] year, TO year, ,and 25 year frequency storm events_ [Section 2'-AJ
2- As required by the Neuse,Stormwater Rule 15A,1VCA'C 2B'.0235 the nutrient load contributed'by
any new development activities is limited to 3 6 pounds per acre,per year (7b9ldelyr) of nitrogen
loading ,DeveIopers shall have the option of partially offsetting projected nitrogen loads by
funding wetland or riparian area restoration through the North Carolina ,Wetland Resto%ataon
Program However, the total' nitrogen loading, rate cannot exceed 6,0,- lbs/,aclyr for residential

development or 10' 0' lbs /,ac%yr for non - residential development, Best management practices must
be used to reduce, nitrogen, loading to ,the, 6 0,,and 10'0 limits and may be used to reduce nitrogen
loading to the 3 6 ,limit Maintenance Hof any BMPS ,imtalled will be' ,the, responsibility of ,the
development [Section 2 -Aj
This ,report contains, calculations detailing the stormwater , impaets as a result of the expansion of
the NTA,,gravel yard, along with_ the, final design / analysis of �storrnwater management facilities
that will be used to mitigate the impact's. Please refer to the appropriate section of this report for
additional `information.
CALCULATION METHODOLOGY
T. Rainfall data for the Raleigh,, TW region 'is from NOAA Atlas 14. This data contains a _
depth - duration- frequency (DDF) table describing rainfall depth versus time for varying
return periods in the area: These rainfall depths, ate `input into the rneteorologi'cal model
within PondPack for peak flow rate calculations., Please reference the precipitation
information section within .this report for additional information (Chapter 3).
2. Due to potential downstream impact`s, SWMF 4 is a high hazard "facility and is, therefore,
subject to the requirements of the Dam, 'Safety .Law of 1967. As part_ of the design
requirements, this facility is required to safely pass the, 1/3' Probable, Maximum
Precipitation'(PMP) event. This event is based on 1,0- i inches of rain distributedn,a 6 =hour
period. The 113 PMP' rainfall ,distribution modeled in this analysi's °is from Figure, 2C on
Page 2 =18 of SCS Technical Release -60 "Earth Dams and Reservoirs." A copy of the
rainfall,adistribution has been included within Chapter 3�, of this report. Please reference
the precipitation information section within this report for additional information
(Chapter 3).
3: Using maps contained within the Wake County Soil Survey, the on- and off_ -site soils
were, determined �to, range from hydrologic soil ,group (HSG) `B'" soils to HSG `D' soils.
Since the method chosen to compute both pr"e- and post- development,peak flow rates and
runoff volumes is dependent- upon the soil type, care was, taken when <selecting the
appropriate, Soil Conservation Seru,`ice Curve, Number- (SCS, CN9). Please, reference the soil
,iriformafiori section within this report for additional information (Chapter- 4).
Within-each sub - basin, an approximate proportion of each, soil group was determined
using MRCS Soil Survey Maps. Gnce an-approxidiate proportion was determined, a
composite SCS RCN was computed for each cover condition. For e-xample, the pre -
development condition of Sub 'basin #1B consists of approximately 37 % H'SG "B`,' soils
and ,69% HSG `D' soils. Therefore, for,the, open area cover condition, ;the composite SCS'
CN is� computed,' as, follows (assuming good condition):
Composite Open, SCS CN = (0 -31 *61) + (0 69 *`M) = 74
This type of calculation `was done for each of the studied sub= basins in the pre- and post -
development condition 'in a- effort to accurately account for the difference in runoff
between HSG D' soils- and HS'G `'D' soil's.
4. 'The time of concentration for each sub -basin was calculated' using the, SCS Segmental
Approach (TR -55, 1986). The Tc path was divided into segments consisting of overland
flow; concentrated flow, and channel flow. The overall time of concentration is the, ,sum
of the indiVidual :segment'times.

5. 'The post - development times of concentration to each stormwater facility am assumed to
be 5 minutes in the -post- development condition. This is aconservative assumption.
6,.- The on -site, topography used in `the analysis is from recent field survey information
Prepared by `The John R. McAdams .Company, .Inc., Off`site topography used in the,
.analysis is from Wake County GIS:
7. Pondpack Version V�8i, by ,Haestad Methods, was used to generate pre - and' post-
development peak flow.rates and model the stormwater facilities.
8. Water quality sizing calculations for Ponds #4 were performed in accordance with the
N.C. ,Stormwater Best Management Practices manual (June 2009). The normal pool
surface area for Pond #1 was, sized, using 'Table 103 in the NCDENR BMP Manual and
the appropriate SA/DA ratio for, a given average depth. Note, that the facility is, sized to achieve 90 %'TSS pollutantremoval efficiency. -
�9. As part of the design for Pond #4, for 1100 -year storm routing calculations, a "worst case
condition" was modeled in order- to insure ',the ,proposed `facility, would safely pass the
1,00 =.year storm event. The starting, water surface elevation in Pond #1, just prior to the
100 -year storm event,, 'is, at the top of riser elevation. This scenario could ,occur as a result
of a clogged siphorr or a rainfall event that lingers for several, days. This could' also occur
,as a result of several rainfall' events in, a, series; before the inverted siphon has an
,opportunity to drawdown the storage pool between'NWSE and the riser crest elevation.
1,0. Nitrogen export calculations are computed' using Method 2 from the Town, of Garner
Storm Drainage Manual, This method uses, known 'footprint areas of wooded', open, and,
impervious surfaces. Please "refer to the provided calculations, for detailed information
regar"ding,pre- and post - development nit_rogen'loading (Chapter 9).
DISCUSSION OF RESULTS
;Site, Data
Pre - development, cover conditions and topography were determined 'from a detailed survey -
prepared by The John R. McAdams Company Inc. Post- d_`evelopment cover conditions were
taken from drawings prepared by The, John R. McAdams, Company Inc. dated May 16, 2014.
Please refer "to the included calculations •for a detailed and of the- pre- development hydrology
(Chapter 5,) and post - development hydrology (Chapter 6),. 'The following provides the pre - and
post - development` site;inforrnationand proposed impervious area improvements.
Site Information
• 'Trotal site area = 6910 acmes,
• Existing rmpervious,a_rea = 41 63 acres
• Post - development impervious area = 45 81 acres
Phase Areas
Phase 1 area =,517 acres
® Phase 2,area =457acres
® Phase 3 area _ 5.95 acres
Proposed Impervious Surface
Phase I new �irnpervious area —0 17 acres
Phase 2 °new impervious area = 0'18 acres
3

■ Phase 3 new impervious area` = 4 36 acres
Release Rate Management
Per Town of Garner requirements, post - development flow rates shall not exceed pre -
development (existing) conditions for the 1 -, 10 -, and 25 -year storm events. Please refer to the
included 'Summary of Results (Chapter 1) for a detailed summary of peak flow rates for pre - and
post - development conditions. Note that there are a few subbasins where an increase in flows
from pre- to post - development are expected. It is the opinion of the design engineer that the
increases'are negligible and can be ignored.
Pond #1
As part of the Phase 3 improvements, Pond #1 was re- analyzed based on the addition of
impervious to its drainage area. It was found that Pond ` #1 can accommodate the additional
impervious as noted below.
Post Development to Pond #1 (Phases 1, 2 & 3)
• Impervious area = 8 64 acres
• Existing impervious area = 7 87 acres
• Phase] and 2 impervious area 0 31 acres
• Phase 3 impervious area = �0, 46 acres
• Total drainage area = 11 70 acres
This facility was analyzed as it.exists in the field. Please refer to the provided watershedmaps for
detailed 'information regarding drainage areas to the facility (Chapter 6), and to the included
calculations for a detailed, analysis of the facility, (Chapter "7).
Pond #4
The proposed NTA expansion pond (Pond #4) has been designed to meet detention and water
quality requirements per the NCDWQ BMP Manual (2009) and Town of Garner standards. In
addition, this facility was determined to be high hazard and has been designed in accordance with
current Dam Safety laws. This facility was designed for the following conditions-
Post Development to Pond #4
• Impervious area = 3 61 acres
• Existing impervious area = 0 15 acres
• Phase 3 impervious area = 3 46 acres
• Total drainage area = 5 36 acres
The proposed facility was designed such that the normal pool surface area meets the required
SA/DA ratio for the corresponding average pool depth. `Normal pool is controlled with a 1.5"
diameter siphon which draws the facility down in 3 -5 days.
Nitrogen Loading
An analysis of the pre- and post - development nitrogen loading for the site was completed in
accordance with Town of Garner standards. Per the Neuse NSW rules, post development
nitrogen loading needs to be compared to pre development loading as it existed in 2001. Since
there were several of 'site changes after the initial implementation of the Neuse rules, the existing
impervious area was determined from the measured impervious using survey information by The
John R. McAdams Company, Inc. less the previously approved NTA headquarters and Gates A-
B additions. As a conservative measure the post - development areas for the NTA headquarters

and Gates ,A -B additions were added back to the pre - development loading as a wooded
(undisturbed open space) condition. The pre- development nitrogen loading is calculated using
Method 2 from the Town of Garner 'Storm Drainage Manual. Please refer to Chapter 9 for a
detailed breakdown of how the pre- development loading was calculated.
Pre Development Conditions for Nitrogen Loading
• Wooded area (undisturbed open space) = 23 83 acres
• Existing commercial/industrial area= 45 27 acres
o Existing impervious area = 33 26 acres
o Existing open area (managed open space) = H 52 acres
o Existing pond area (managed open space) = 0,49 acres
Per Town of Garner requirements, the post development nitrogen loading is based upon "new"
impervious ,area (defined as impervious area ,added since implementation of the Neuse rules).
The calculation of new impervious area is taken from the post - development hydrology
calculations prepared in Chapter 6 of this report and from the previously approved NTA
headquarters and Gates A -B additions. The post development nitrogen loading for the site is to
be calculated using Method 2 from the Town of Garner Storm Drainage Manual Please refer to
Chapter 15 for a detailed breakdown of the post - development nitrogen loading.
Post Development Conditions for Nitrogen Loading
■ To Pond #1 (Total area = 3 59 acres)
• New impervious area = 0 77 acres
• Open area (managed open space) = 2 22 acres
o, Wooded area (undisturbed open space) = 014 acres
o Pond area (managed open space), = 0 46 acres
■ To Pond #3- (Total area = 10 34 acres)
• New impervious area 0 26 acres
o Open area (managed open space) = 191 acres
• Wooded area (undisturbed,open space) = 0 08 acres
• Pond area (managed open space) = 0 33 acres
• To Pond #4 (Total area = 4 75 acres)
• New impervious area = 3 46 acres
• Open area (managed open space) = 0 75 acres
• Wooded area (undisturbed open space) = 013 acres
• Pond area (managed open space) = 0 26 acres
• Bypass (Total area = 17 24 acres)
• New impervious area = 0 22 acres
• Phase 2 improvements to Su'bbasin #3 = 0 08,acres
• Phase 2 improvements to Pond #2 = 0 OL acres
• Previously approved Gates A and B = 0 07 acres
• Phase 3 ,improvements to Subbasmn #6 = 0 06 acres
• Phase 3 improvements to Subbasin #7 = 0 01 acres
• Open area (managed open space) = 10 13 acres
• Wooded area (undisturbed open space) = 6 76 acres
• Pond area (managed open space) = 013 acres
Please refer to the included calculations for a detailed analysis of the nitrogen loading (Chapter
9).
Lake Benson Watershed Analysis
Improvements contained as part of this phase did not affect subbasins draining to Lake Benson.
Therefore, the previously,approved analysis for,these subbasins is;still valid.

CONCL UMON
If the development on this tract is built as proposed within this report, then the requirements set
forth by the Town of Garner will be met with the proposed stormwater management facilities.
However, modifications to the proposed development may require that this analysis be revised.
Some modifications that would require this analysis to be revised include:
1. The proposed site impervious surface exceeds the amount accounted, for in this report.
2. The post- development watershed breaks change significantly from those used to prepare
this report.
The above modifications may result in the assumptions within this report becoming invalid. The
computations within this report will need to be revisited if any of the above conditions become
apparent as development of the proposed site moves forward.