SW3140901_HISTORICAL FILE_20150210

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
1p HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
5��
YYYYM M DD

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Energy, Mineral, and Land Resources
Tracy E. Davis, PE, CPM
Director
September 30, 2014
Mr. Tom Slusher
Vice President of Engineering and Operations
Union Electric Membership Corporation
P. 0. Box 127
Monroe, North Carolina 28111-0127
Subject: Stormwater Permit No. SW3140901
Mount Pleasant Substation
Dear Mr. Slusher:
Pat McCrory, Governor
John E. Skvada, III, Secretary
DIVISION OF LAND RESOURCES
r-AND QUALITY SECTION
FEB 10 2015
AND rraNq,LL q Upogq
The Stormwater Program under the Division of Energy, Mineral, and Land Resources (DEMLR),
received a complete Stormwater Management Permit Application for the subject project. Staff
review of the plans and specifications has determined that the project, as proposed, will comply
with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000 and Session Law 2006-246.
We are forwarding Permit No. SW3140901, dated September 30, 2014. This permit shall be
effective from the date of issuance, shall be subject to the conditions and limitations as specified
therein, and does not supersede any other agency permit that may be required.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the
right to request an adjudicatory hearing by filing a written petition with the Office of Administrative
Hearings (OAH). The written petition must conform to Chapter 15013 of the North Carolina General
Statutes. Per NCGS 143-215(e) the petition must be filed with the OAH within thirty (30) days of
receipt of this permit. You should contact the OAH with all questions regarding the filing fee (if a
filing fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh,
NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com.
Unless such demands are made this permit shall be final and binding.
This project will be kept on file at the Mooresville Regional Office. If you have any questions, or
need additional information concerning this matter, please contact Larry Wade PE at [phone]; or
[e-mail].
SSiincerelyy,
%v�-
William H. Diuguid, AICP,`rlans Reviewer
for Tracy E. Davis, P.E., CPM
Director, Division of Energy,Mineral & Land Resources
cc: SW3140901 File, Mooresville Regional Office
cc: Lynn Mathis PE, UC Synergetic LLC, 123 N White S[.,Fort Mill SC 29715
Geological Survey Section • Land Quality Section
1612 Mail Service Center, Raleigh, North Carolina 27699-1612.919-707-9200 / FAX: [phone]
512 North Salisbury Street, Raleigh, North Carolina 27604 • Internet: http://portal.nodenr.org/web/Ir/
An Equal Opportunity 1 Affirmative Action Employer - 50% Recycled 110% Post Consumer Paper

State Stormwater Permit
Permit No.SW3140901
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
STATE STORMWATER MANAGEMENT PERMIT
�V7
In accordance with the provisions of Article 21 of Chapter 143, General Statu'es/off.
North Carolina as amended, and other applicable Laws, Rules and Regulaticft) f � ����s
PERMISSION IS HEREBY GRANTED TO OFf FF6 SFC� NOFS
Union Electric Membership Corporation .q�` ,,14107S
Mount Pleasant Substation
3400 Mount Pleasant Road South, Cabarrus County �g0�Fiyj
FOR THE
construction, operation and maintenance of a low density development in compliance
with the provisions of 15A NCAC 2H .1000 and S.L. 2006-246 (hereafter referred to as
the "stormwater rules') and the approved stormwater management plans and
specifications, and other supporting data as attached and on file with and approved by
the State and considered a part of this permit.
The Permit shall be effective from the date of issuance until rescinded and shall be
subject to the following specific conditions and limitations:
I. DESIGN STANDARDS
1. The overall tract built -upon area percentage for the project must be maintained
below 24%, as required by Session Law 2006-246 of the stormwater rules.
3. Approved plans and specifications for projects covered by this permit are
incorporated by reference and are enforceable parts of the permit.
4. The only runoff conveyance systems allowed will be vegetated conveyances
such as swales with minimum side slopes of 3:1 (H:V) as defined in the
stormwater rules and approved by the Division.
5. No piping is allowed except that minimum amount necessary to direct runoff
beneath an impervious surface such as a road or to provide access.
6. All roof drains must terminate at least 30 foot from the mean high water mark.
7. The built -upon areas associated with this project shall be located at least 30 feet
landward of all perennial and intermittent streams.
8. All swales that discharge into a wetland shall do so at a non -erosive velocity for
the 10 year storm.
Page 1 of 4

State Stormwater Permit
Permit No.SW3140901
II. SCHEDULE OF COMPLIANCE
The permittee is responsible for verifying that the proposed built -upon area does
not exceed the allowable built -upon area.
2. The Director may notify the permittee when the permitted site does not meet one
or more of the minimum requirements of the permit. Within the time frame
specified in the notice, the permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements. The permittee
shall provide copies of revised plans and certification in writing to the Director
that the changes have been made.
3. This project may not be sold or subdivided in whole or in part without first
receiving a permit modification.
4. The following deed restrictions must be recorded with the Office of the Register
of Deeds:
a. The following covenants are intended to ensure ongoing compliance with
State Stormwater Management Permit Number SW3140901.
b. The State of North Carolina is made a beneficiary of these covenants to
the extent necessary to maintain compliance with the Stormwater
Management Permit.
C. These covenants are to run with the land and be binding on all persons
and parties claiming under them.
d. The covenants pertaining to stormwater may not be altered or rescinded
without the express written consent of the State.
e. Alteration of the drainage as shown on the approved plans may not take
place without the concurrence of the State.
f. This project may not be sold or subdivided, in whole or in part, without first
receiving a permit modification from the Division.
h. Construction of additional impervious areas such that low -density
requirements are no longer met will require a permit modification prior to
construction. An engineered system will be required to collect and treat
the runoff from all built -upon area associated with the project, including
that area permitted under the low density option.
i. Filling in or piping of any vegetative conveyances (ditches, swales, etc.)
associated with this development, except for average driveway crossings,
is strictly prohibited by any persons.
j. The built -upon areas shall be located a minimum of 30 feet landward of all
perennial and intermittent surface waters.
5. A copy of the recorded restrictions must be received in this Office within 30 days
of the date of project completion.
6. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed
below:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision, acquisition, or sale of the project area in whole or in
part. The project area is defined as all property owned by the permittee,
for which Sedimentation and Erosion Control Plan approval was sought.
f. Filling in, altering or piping any vegetative conveyance shown on the
Page 2 of 4

State Stormwater Permit
Permit No.SW3140901
approved plan.
8. During construction, erosion shall be kept to a minimum and any eroded areas of
the swales or other vegetated conveyances will be repaired immediately.
9. The permittee shall at all times provide the operation and maintenance
necessary to operate the permitted stormwater management systems at
optimum efficiency to include:
a. Inspections
b. Sediment removal.
c. Mowing, and re -vegetating of the side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and
specifications.
10. Within 30 days of completion of the project, the permittee shall certify in writing
that the project has been constructed in accordance with the approved plans.
11. The permittee shall submit all information requested by the Director or his
representative within the time frame specified in the written information request.
III. GENERAL CONDITIONS
This permit is not transferable to any person or entity except after notice to, and
approval by the Director. The Director may require modification or revocation and
re -issuance of the permit to change the name and incorporate such other
requirements as may be necessary. In the event of a name or ownership
change, a completed Name/Ownership Change form, signed by both parties,
must be submitted to the State accompanied by the supporting documentation
as listed on page 2 of the form. The approval of this request will be considered
on its merits, and may or may not be approved.
2. The permittee is responsible for compliance with all permit conditions until the
Director approves a transfer of ownership. Neither the sale of the project nor the
transfer of common areas to a third party, such as a homeowner's association,
constitutes an approved transfer of the stormwater permit.
3. Failure to abide by the conditions and limitations contained in this permit may
subject the Permittee to an enforcement action in accordance with North
Carolina General Statutes 143-215.6A to 143-215.6C.
4. The issuance of this permit does not prohibit the Director from reopening and
modifying the permit, revoking and reissuing the permit, or terminating the permit
as allowed by the laws, rules, and regulations contained in Session Law 2006-
246, Title 15A of the North Carolina Administrative Code, Subchapter 21-1.1000;
and North Carolina General Statute 143-215.1 et. al.
In the event that the facilities fail to perform satisfactorily, including the creation
of nuisance conditions, the Permittee shall take immediate corrective action,
including those as may be required by the State, such as the construction of
additional or replacement stormwater management systems.
The permittee grants permission to DENR Staff to enter the property during
normal business hours, for the purpose of inspecting all components of the
stormwater management facility.
7. The permit issued shall continue in force and effect until revoked or terminated.
Page 3 of 4

State Stormwater Permit
Permit No.SW3140901
The permit may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and re -issuance, or
termination does not stay any permit condition.
8. Unless specified elsewhere, permanent seeding requirements for the swales
must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
9. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
10. The issuance of this permit does not preclude the Permittee from complying with
any and all statutes, rules, regulations, or ordinances, which may be imposed by
other government agencies (local, state and federal), which have jurisdiction.
11. The permittee shall notify the Division in writing of any name, ownership or
mailing address changes at least 30 days prior to making such changes.
Permit issued this the 30`h day of September, 2014.
U/.
William H. Diuguid, AICP, Plans Reviewer
for Tracy E. Davis, P.E., CPM
Director, Division of Energy, Mineral and Land Resources
Page 4 of 4

RECEIVED
. SEP 2 5 2014
DENR•LV QUALITY
STORMWATER PERMITTING
SUBMITTAL REQUIREMENT VI-3
FNOQU ��SF TOURpFo
STORMWATER MANAGEMENT PERMIT N
�10,2015
APPLICATION FORM
gEs•,,,vl yM
LOW DENSITY SUPPLEMENT

Permit No.
(to be provided by DEMLR)
State of North Carolina
Department of Environment and Natural Resources RECEIVED
Division of Energy, Mineral and Land Resources
STORMWATER MANAGEMENT PERMIT APPLICATION FORM $EP 2 5 2��4
DENR-LAND QUALITY
LOW DENSITY SUPPLEMENT STORMWATER PERMITTING
77iis form may be photocopied for use as an original
A low density project is one that meets the appropriate criteria for built upon area and4yanspc
runoff primarily through vegetated conveyances. Low density projects should not haveYHisc
collection system as defined by 15A NCAC 2H .1002(18). Low density requirements and de°rigitij
found in Session Law 2008-211, 15A NCAC 2H A000, Session Law 2006-246 and the State of;
Stormwater Best Management Practice Manual. Curb and gutter systems are alloUed pro fed
requirements in 15A NCAC 2H A008(g).
444
I. PROJECT INFORMATION 4e,�9q�`'
n
Project Name :
Contact Person: Lynn E. Mathis Phone Number: ( 803 )835-7923
stormwater
stormwater
;tors can be
Number of Lots:l Allowable Built Upon Area (BUA) Per Lot*:20%
Number of Dwelling Units Per Acre**:NA
Low Density Development (check one): ® without curb & gutter ❑ with curb & gutter, outlets to (check one):
❑ Swales ❑ Vegetated Area
*If lot sizes are not uniform, attach a table indicating the number of lots, lot sizes and allowable built upon area for each lot.
The attachment must include the project name, phase, page numbers and provide area subtotals and totals. BUA shall be
shown in units of square feet.
**(Phase II Post -Construction Inon-SAI only)
Ill. BUILT UPON AREA
Refer to DEMLR's forms and applications website for specific language that must be recorded in the deed
restrictions for all subdivided projects. (http://l)ortal.ncdehr.org/web/Ir/state-stormwater-forms docs)
Complete the following calculation in the space provided below where:
• SA Site Area - the total project area above Mean High Water.
• DF Density Factor - the appropriate percent built upon area divided by 100.
• RA Road Area- the total impervious surface occupied by roadways.
• OA Other Area -the total area of impervious surfaces such as clubhouses, tennis courts, sidewalks, etc.
• No. of Lots - the total number of lots in the subdivision.
• BUA per Lot - the computed allowable built upon area for each lot including driveways and impervious
surfaces located between the front lot line and the edge of pavement.
• Total allowable lot BUA - the computed allowable built upon area for all lots combined.
• Total BUA from lot listing - the sum of built upon area allocated for each lot on the list of non -uniform lots.
Form SW401-Low Density-Rev.3-2/10/09 Page 1 of 4

Calculation:
For uniform lot sizes:
(SA: 545371.2 ft2 x DF: 0.2) — (RA: 14303 ft2) — (OA: 937 ftz) = BUA per Lot = 93834.24 ft2
(No of Lots: 1)
For non -uniform lot sizes:
a. (SA: ft2 x DF: ) — (RA: ft2) — (OA: ft2) = Total allowable lot BUA = ft2
b. Total BUA from lot listing: sf. b must be < a
I11. DESIGN INFORMATION
Complete the following table. If additional space is needed the information should be provided in the same
format as Table 1 and attached to this form. Rainfall intensity data can be found in Appendix 8.03 of the State
of North Carolina Erosion and Sediment Control Planning and Design Manual or at
http://hdse.nws.noaa.gov/hdsc/pfds/
Table 1. Swale design information based on the 10-year storm. S45 tvi�rHoD
Swale No.
Drainage
Area (ac)
Impervious
Area ac
Grassed
Area ac
C
G� ✓E
Q
cfs)
Slope
(%)
Va11ow
(fps)
Vactual
s)
Flow
Depth ft
1
0.79
0.32
0.47
76
4.38
0.02
4.50
3.49
0.33
2
8.74
1.50
3.43
66
11.95
0.041
16.0
3.50
0.31
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Form SW401-Low Density-Rev.3-2/10/09 Page 2 of 4

IV. REQUIRED ITEMS CHECKLIST'
The following checklist outlines design requirements per the North Carolina Administrative Code Section 15A
NCAC 2H .1000, NCDENR BMP Manual (2007), Session Law 2006-246, and Session Law 2008-211.
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An
incomplete submittal package will result in a request for additional information. This will delay final
review and approval of the project. Initial in the space provided to indicate that the following requirements
have been met and supporting documentation is provided as necessary. If the applicant has designated an agent
on the Stormwater Management Permit Application Form, the agent may initial below. If any item is not met,
then justification must be attached. Only complete items n through p for projects with curb outlets.
Page/Plan.
Initials Sheet No.
N/A a. t For projects in the 20 coastal counties: Per NCAC 2H.1005, a 50 foot wide vegetative buffer
is provided adjacent to surface waters. For Redevelopment projects, a 30' wide vegetative
buffer adjacent surface waters is provided.
N/A b. t For HQW or ORW projects outside the 20 coastal counties: A 30 foot wide vegetative buffer
is provided adjacent to surface waters.
3 of 8 c. t For Phase Il Post -Construction projects: All built upon area is located at least 30 feet
landward of all perennial and intermittent surface waters.
N/A d. Deed restriction language as required on form SWU-101 shall be recorded as a restrictive
covenant. A copy of the recorded document shall be provided to DWQ within 30 days of
platting and prior to the sale of any lots.
VI-7 e. Built upon area calculations are provided for the overall project and all lots.
VIVI1 - f.Project conforms to low density requirements within the ORW AEC. (if applicable per
15A NCAC 2H .1007)
7 of 8 g. Side slopes of swales are no steeper than 3:1; or no steeper than 5:]for curb outlet swales.
4 of 8 h. Longitudinal slope of swales is no greater than 5%; for non -curb outlet projects, calculations
for shear stress and velocity are provided if slope is greater than 5%.
VI-7 i. At a minimum, swales are designed to carry the 10 year storm velocity at a non -erosive rate.
N/A j. Swales discharging to wetlands are designed to flow into and through the wetlands at a non -
erosive velocity (for this flow requirement into wetlands, non -erosive is velocity < 2 ft/s).
7-8 of 8 k. Swale detail and permanent vegetation is specified on the plans.
7-8 of 8 1. Swale detail provided on plans; includes grass type(s) for permanent vegetative cover.
3 of 8 m. Swales are located in recorded drainage easements.
N/A n.tt Length of swale or vegetated area is at least 100 feet for each curb outlet.
N/A o.tt The system takes into account the run-off at ultimate built -out potential from all surfaces
draining to the system (delineate drainage area for each swale).
N/A p.tt Curb outlets direct flow to a swale or vegetated area.
t Projects in the Neuse, Tar -Pamlico, Catawba River basins, and Randleman Lake may require additional buffers.
tt Only complete these items for projects with curb outlets.
Form SW401-Low Density-Rev.3-2/10/09 Page 3 of 4

V. SWALE SYSTEM MAINTENANCE REQUIREMENTS
1. Mowing will be accomplished as needed according to the season to maintain a healthy vegetative cover. Grass
heights will not be mowed too close to the ground or "scalped". Vegetation will be maintained at a height of
approximately six inches.
2. Swales will be frequently inspected for the first few months after construction or until the site is stabilized to ensure
vegetative cover is establishing well. After the site is stabilized, swales will be inspected at least quarterly for
sediment build-up, erosion, and trash accumulation.
3. Accumulated sediment and trash will be removed as necessary. Swales will be reseeded or sodded following
sediment removal.
4. Eroded areas of the swales will be repaired and reseeded. Swales will be revegetated as needed and in a timely
manner based on the periodic inspections. Side slopes must be maintained at the permitted slope.
5. Catch basins, curb cuts, velocity reduction devices, and piping will be inspected at least quarterly. Trash and debris
will be cleared away from grates, curb cuts, velocity reduction devices and piping.
6. Swales will not be altered, piped, or filled in without approval from NCDENR Division of Energy, Mineral and Land
Resources.
I acknowledge and agree by my signature below that I am responsible for the performance of the six maintenance
procedures listed above. I agree to notify DEMLR of any problems with the system or prior to any changes to the system
or responsible party.
Print Name and Title: Thomas D. Slusher, Vice President of Engineering & Operations
saa. — Union Power Cooperative, 1525 Rocky River Road North, Monroe, NC 28110
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% ojthe lots have been sold and a
resident ofthesubdivision has been named the president. ^r /�
I,.i rT-u� 1 1 y T N a NNottaaty Public fortheState of I q (1 -r+1 I . Al I i tM , County of
uN I o rJ do herebyV � 11_Si that l lof M1S 1). 4 R\ personally appeared before me this Y
day ofOn . zo 1 and acknowledge the due execution of the forgoing swale maintenance requirements.
Witness my hand and official seal,
Notary signature
My commission expires L-/-S-/-01 /
Form SW401-Low Density-Rev.3-2/10/09 Page 4 of 4

DIVISION OF LAND RESOURCES
I -AND QUALITY SECTION
Wade, Larry FFR 1 0 415
From: Lynn Mathis [[e-mail]) DEHAhII.,".......... AiIvmcl.
Sent: Tuesday, December 02, 2014 4:55 PM AND NATURAL RESOURCES
To: Wade, Larry
Cc: Nathan V. Bass; Bou-ghazale, Samar
Subject: Union Power Mt. Pleasant Substation -Project ID: SW3140901 Permit
Attachments: MT PLEASANT SUBSTATION - Site Plan and Grading IFC 092314.pdf; MT PLEASANT
SUBSTATION - Site Plan and Grading IFC 102114.pdf
Larry, attached are the Site Plan and Grading Plan for Union Power's Mt. Pleasant Substation in Cabarrus County. Per
the County's Conditional Use Permit Approval and Zoning Compliance review, the following revisions have been made to
the site development plans...
1. Relocate the temporary silt fence (in the southeast corner of the lot parcel) outside the 75' side yard setback and,
2. Increase the water body buffer zone (in the south central portion of the lot) to include the previous farm pond area
(which has now been drained).
The referenced temporary silt fence (southeast corner of lot parcel) was to provide sediment control for potential excess
spoil, and was not really site specific. It has simply been moved northward outside the 75' side yard buffer. The
inclusion of the former pond area (approx. 0.072, 3,150 sq. ft.) in the water body buffer zone was required since the US
Corps of Engineers and/or NC DENR did not formally review the site after the pond was drained. Both USACE and DENR
reviewed the site initially, and indicated the pond was non -jurisdictional and could be drained. The increase in the
buffer zone had no effect on the proposed/submitted plans.
Per the CUP/Zoning Review, the above listed modifications have been made to the Mt. Pleasant Site Plan and Grading
Plan. Project plans were not formally re -submitted to your office because we felt the changes were minor and had no
effect on proposed stormwater control plans for the project. However, because the plans have been modified since
initial approval by NC DENR, Cabarrus County needs verification of project approval from your office. If you would,
please review the attached plans and proposed changes, and indicate a final approval for the project. The initial plans
(as submitted to your office) were dated 09/23/14. The revised plans are dated 10/21/14. Changes are "clouded" in
red.
Since the changes are minor, we would very much appreciate email verification of project approval in the essence of
time, as the project has been in review with Cabarrus County for the past several weeks. Also, to help insure you have
the most current copy of all plans and drawings, we will send you two complete sets (hard copy) of the plans and
drawings ... as there have been minor note revisions in some supporting drawings. Please contact me at 803/835-7923 if
there are any questions/concerns, or if you need any additional information.
Thanks very much for your help and consideration.
Lynn E. Mathis
Lynn E. Mathis
UC SYNEZGETIC0
123 North White Street
Fort Mill, SC 29715
[phone](0)
[phone] (F)
ImathisCal ucseno.com

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10/1-z
UC SYNEaGETIC °
9N QGq<
Innovative Thinking. 8ngineoed Solutions. °F, /fin
September 24. 2014
Stormwater Permitting Staff 9P� •, v
Attn: Larry Wade
North Carolina Department of Environment and Natural Resources
1612 Mail Service Center
Raleigh, NC 27699
Re: Revision to Stormwater Management Permit
Per Stormwater Permitting Staff Comments for
Union Power Cooperative — Mt Pleasant Substation (SW3140901)
Dear Mr. Wade:
RIVED
Skid 25 2014
DEN' -LAND QUALITY
STORMWATER PERMITTING
Union Power Cooperative is proposing to construct the Mt Pleasant electrical substation at 3400
Mt Pleasant Road South. On Union Power's behalf, UC Synergetic previously submitted a
Stormwater Management Permit on September 04, 2014. Per comments from the NCDENR
Stormwater Permitting Staff and NC Department of Transportation, we have enclosed the
following revised documents.
1. Two copies of the Stormwater Management Permit Application Form;
• Signed and notarized page to be attached from previously submitted application.
2. A copy of the Low -Density Supplement Form;
• Signed and notarized page to be attached from previously submitted application.
3. Revised narrative describing the stormwater treatment/management details for the
project;
4. Revised stormwater calculations;
Two (2) copies of the construction documents (site plan, grading and erosion control
plan, drainage plan, oil containment system plan, and site details);
On behalf of Union Power, we appreciate your preliminary review of the documents and the
opportunity to amend the plans. If you have any questions or require and additional information,
please contact me at [phone] or lmathis n,ucseng eom.
Sine ely,
Sine
Lynn MathiO
cc: Union Power Cooperative, Attn: Tom Slusher (Transmittal Letter Only)
P.O. Box 1859 • Fort Mill, SC 29716 • 123 North White Street • Fort Mill, SC 29715
P: 803-835-7820 • F: 803-835-7825 • www.ucsinc.com

"V'S'ON OF
ND IJESOU
'AND QUALITY SEC, RCES
Wade, Larry
ION
From: Wade, Larry Dl w C0 1 U2015
Sent: Friday, September 19, 2014 9:31 AM qAU) `•
To: '[e-mail]' NA7tRAC gESO�v"'gtNT
Cc: '[e-mail]'; Diuguid, Bill �gy
Subject: SW 3140901 Mt. Pleasant Substation - Cabarrus County - Additional Information Request
Mr. Mathis,
After a review of the design documents received in our office on September 8, 2014 for the subject proposed facility, I
am requesting additional information or revision of the following items;
1. The impervious area or "Built Upon Area" (BUA) noted on your Permit Application, and Project Narrative is
noted as 2.89C Based on my assessment, the BUA should be much higher. All areas of gravel on compacted
subgrade should be included in this calculation. Please revise the documentation to include all impervious
areas, and verify this will meet the Low Density requirements based on the corrected areas.
2. Access easements to a public right of way are required for all stormwater BMPs. Easements must be of
sufficient width to access and maintain the BMP. Please show the easements on the Site Plan with sufficient
dimensions to provide an accurate description.
3. Please show all grassed swales that are proposed on the Site Plan and reflect them in the finished grade
topography.
4. Please show the Dissipator Pads on the Site Plan and reference the detail drawing on Sheet 7.
5. You provided information for portions of the Sedimentation and Erosion Control in your submittal. This
review is for the post construction stormwater permit only. You will need to secure a Grading Permit
through our Mooresville Regional Office or a local program if one exists in that area. A review of the
Sedimentation and Erosion Control Design will be required at that time.
Please provide a response to these comments within 30 days of the date of this letter. If you have any question, let me
know.
Larry W. Wade PE Telephone: [phone]
Fax: [phone]
Stormwater Permitting Program
North Carolina Department of Environment & Natural Resources
Division of Energy Mineral and Land Resources
1612 Mail Service Physical Address - 512 N. Salisbury St. Room 9425
Raleigh, NC 27699-1612
Raleigh, NC 27604
************************This is a government E-mail address**************,**************
*********E-mails sent and received from this address can be disclosed to third parties************

O/1 / /a
UC SYNEPGETIC �b
Innovative Thinking. Engineered Solutions. F
September 05, 2014
Stormwater Permitting Staff
North Carolina Department of Environment and Natural Resources
1612 Mail Service Center
Raleigh, NC 27699
Re: Stormwater Management Permit for
Union Power Cooperative — Mt Pleasant Substation
Dear Stormwater Permitting Staff:
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Union Power Cooperative is proposing to construct the Mt Pleasant electrical substation at 3400
Mt Pleasant Road South. I have enclosed the following documents that constitute a complete
application for a Stormwater Management Permit.
1. Original and one copy of the Stormwater Management Permit Application Form;
2. Original of the Low-Densityy Supplement Form;
3. A check in the amount of $505 to cover the application fee;
4. Detailed narrative describing the stormwater treatment/management for the project;
5. Quadrangle map with project boundary;
6. Vicinity map with project boundary;
7. Aerial photography with project boundary;
8. Stormwater calculations;
9. Two (2) copies of the construction documents (site plan, grading and erosion control
pplan dramage plan, oil containment system plan, and site details);
10. NRCS Soil Report and map;
11. Property deed;
12. NC Secretary of State Documentation.
On behalf of Union Power, thank you for reviewing these documents. If you have any questions
or require and additional information, please contact me at [phone] or
Imathts u,ucseng com.
Sincerely,
4. e. J'�
Lynn Mathis
P.O. Boa 1859 • Fort Mill, SC 29716 • 123 North White Street • Fort Mill, SC 29715
P: 803-835-7820 • F: 803-835-7825 • www.ucsinc.com

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2�fU�At 4,-,,XX waAe a-t-ezcr.ss<N�
Application Completeness Review A/
a�First Submittal ❑ Re -submittal Date Received: f9 /4 Date Reviewed: 9 `/ / By Biflbiuguid
Development/Project Name:
Receiving stream name 14•E to bwt-aA aw FG / . t Classification: °`uri la..
River Basin: , • _ t ,;;yl�.��
For post -co struction requirements, a program will be deemed compliant for the areastiyhere it/is:` Sic,'
implementing any of the following programs: WS-I, WS-II, WS-III, WS-IV, HQW, ORW, NQUse RtverPasin
NSW, Tar -Pamlico River Basin NSW, and the Randleman Lake Water Supply Watershed" Nt rient C'
Management Strategy. +t /5'
High Density Projects that require a 401/404 within an NSW require 85% TSS, 30% TN and 30% TP r tnoGalw-
T&E Species (Goose Creek,
Latitude and Longitude:
Project Address: 3 y-o;
Engineer name and firm:
Phone 9 4 3, V I C-!
Waxhaw Creek or Six Mile Creek Water Sheds):
22 /7.49N -80 2 9 Jurisdiction m,4-lJ<or,r// n6aeeu
on out(
.ar E /19w�.s Dc u C 5�:✓cn A. -Frn. /_/ e-
Is the project confirmed to be in the State MSI Stormwater Permit jurisdiction? WYes or ❑ No
Ear Low Density (no curb and gutter) ❑ Low Density with curb and gutter outlets ❑ High Density ❑ Other
--a--401/404-impacts•to.surface waters, wetlands, and buffers (add language to cover letter and/or add info letter)
�B - Al0 /
ia�Ch for $505.0 eluded � o
d Original signa ure (not photocopy) on application
a' Legal signature (Corporation-VP/higher, Partnership -General Partner/higher, LLC-member/manager, Agent).
Check spelling, capitalization, punctuation: http://www.secretary.state.nc.us/corporations/thepage.aspx
If an agent signs the application, a signed letter of authorization from the applicant must be provided which
igefudes the name, title, mailing address and phone number of the person signing the letter.
Copy of property deed showing ownership or control
—t-or suooivided projects, a signed and notarized deed restriction statement
led, signed & dated calculations
orrect supplement and O&M provided for each BMP on site (check all that were provided & number of each)
❑ Bioretention
Dry Detention BllteFasin
Dote
❑ Infi ra n asin
❑ Infiltration Trench
❑ Level Spreader
❑ Permeable Pavement
❑ Restored Riparian Buffer
❑ Rooftop Runoff Management
❑ Sand Filter
❑ Stormwater Wetland
Detention Basin
ow Densi s
❑ Curb Outlet
❑ Off -Site
❑ NCDOT Linear Road
TTwo sets of sealed, signed &dated layout & finish grading plans with appropriate details
v5 arrative Description of stormwater management provided
Ui oils report, geotech information provided
Wetlands delineated or a note on the plans or in the accompanying documents that none exist on site and/or
adjacent property
r/ Details for the roads, parking area, cul-de-sac radii, sidewalk widths, curb and gutter;
a� Dimensions & slopes provided
t/ Drainage areas delineated ❑ Pervious and impervious reported for each ❑ Areas of high density
;d P#P operation and maintenance eements provided
Application complete Returned: a e)
April 26, 2013 Revision, Bill Diuguid

SUBMITTAL REQUIREMENT VI-1
STORMWATER MANAGEMENT PERMIT
APPLICATION FORM
0/V/S/0
/AND QQA�� F� 0UR
OEh,U,, FFBI
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kalu< RfsObq� f
RECEIVE
S�►' �,� 2u�4
DENR•A ERPERM�nING
STORM

DEMLR USE ONLY
Date Received
Fee Paid
Permit Number
Applicable Rules: ❑ Coastal SW -1995 ❑ Coastal SW - 2008 ❑ Ph II - Post Construction
(select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan
❑ Other WQ M mt Plan:
State of North Carolina
Department of Environment and Natural Resources
Division of Energy, Mineral and Land Resources RECEIVED
STORMWATER MANAGEMENT PERMIT APPOICATION FOISM) 25 2014
This form may be photocopied for use as an orig(tt 41
I. GENERAL INFORMATION �QOp
DENR-LAND QUALITY
RMWATER PERMITTING
1. Project Name (subdivision, facility, or establishment name -should be co istent w thS Xo ect name on plans,
specifications, letters, operation and maintenance agreements, eH?5)''•.j� �Oy CFI,
2. Location of Project (street address):
City:Mt Pleasant County:Cabarrus Zip:28124
3. Directions to project (from nearest major intersection):
From the intersection of Highway 49 and Highway 73 travel southeast onto Highway 73 for 1.6 miles. Then
take a right onto Mt Pleasant Road South and travel 1.6 miles before reaching the entrance to the Mt Pleasant
Substation property, which is directly across from Willow Creek Drive.
4. Latitude:35° 22' 17.67" N Longitude:80° 26' 46.87" W of the main entrance to the project.
II. PERMIT INFORMATION:
1. a. Specify whether project is (check one): ®New ❑Modification ❑ Renewal w/ Modificationt
tRenemals With modifications also requires SWU-102 - Renetoal Application Form
b.If this application is being submitted as the result of a modification to an existing permit, list the existing
permit number , its issue date (if known) , and the status of
construction: ❑Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification
2. Specify the type of project (check one):
®Low Density ❑High Density ❑Drains to an Offsite Stormwater System ❑Other
3. If this application is being submitted as the result of a previously returned application or a letter from
DEMLR requesting a state stormwater management permit application, list the Stormwater project number,
if assigned, and the previous name of the project, if different than currently
proposed,
4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑LAMA Major
❑NPDES Industrial Stormwater
®Sedimentation/Erosion Control: 5.91 ac of Disturbed Area
❑404/401 Permit: Proposed Impacts
b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:None have been acquired
5. Is the project located within 5 miles of a public airport? ®No ❑Yes
If yes, see S.L. 2012-200, Part VI: httl2://portal.ncdenr.org/web/Ir/rules-and-regulations
Form SWU-101 Version Oct. 31, 2013 Page 1 of

III. CONTACT INFORMATION
1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the project):
Applicant/Organization: Union Electric Membership Corporation
Signing Official & Title:Tom Slusher, Vice President Engineerin and nd Operations
b.Contact information for person listed in item la above:
Street Address:1525 North Rocky River Road North
City:Monroe State:NC Zip:28110
Mailing Address (ifapplicable):PO Box 127
City:Monroe
Phone: (704 ) 289-3145
Email:[e-mail]
State:NC Zip:28111-0127
Fax: (704 ) 296-0408
c. Please check the appropriate box. The applicant listed above is:
® The property owner (Skip to Contact Information, item 3a)
❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below)
❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
❑ Developer* (Complete Contact Information, item 2a and 2b below.)
2, a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/1
Signing Official &
b. Contact information for person listed in item 2a above:
Street Address:
Mailing Address (if
City:
Phone: ( )
Fax:
3. a. (Optional) Print the name and title of another contact such as the projects construction supervisor or other
person who can answer questions about the project:
Other Contact Person/Organization:
Signing Official & Title:
b.Contact information for person listed in item 3a above:
Mailing Address:
City:
Phone: ( ) Fax: ( )
4. Local jurisdiction for building permits: Cabarrus County, NC
Point of Contact:Suzie Morris Phone #: (704 ) 920-2858
Form SWU-101 Version Oct. 31, 2013 Page 2 of 7

IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
The proposed site/substation pad will generally be designed for sheet -flow runoff that will Flow to
surrounding vegetative collection swales and conveyances. Upon completion, the substation pad will be
surfaced with a "washed stone" layer, which should help slow runoff from the facility. Newly created
swales/conveyances will feed to the existing natural, vegetative draws/reaches. New impervious area for the
facility will be limited to approximately 11.3% of the total project area.
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
❑ Approval of a Site Specific Development Plan or PUD Approval Date:
❑ Valid Building Permit Issued Date:
❑ Other: Date:
b.lf claiming vested rights, identify the regulation(s) the project has been designed in accordance with:
❑ Coastal SW -1995 ❑ Ph II - Post Construction
3. Stormwater runoff from this project drains to the Yadkin -Pee Dee River basin.
4. Total Property Area: 12.52 acres
5. Total Coastal Wetlands Area: 0.0 acres
6. Total Surface Water Area: 0.0 acres
7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project
Area':12.52 acres
Total project area shall be calculated to exclude thefollowing. the normal pool of impounded structures, the area
between the banks of streams and rivers, the area below the Normal High Water (NHW) line or Mean High Water
(MHW) line, and coastal wetlands landward from the NHW (or MHW) line. The resultant project area is used to
calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NHW (or MHW) line may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 11.3 %
9. FIow many drainage areas does the project have?7 (For high densihj, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
Form SWU-101 Version Oct. 31, 2013 Page 3 of 7

Basin Information
Draina e Area 1
Draina e Area _
Draina e Area _
Draina e Area _
Receiving Stream Name
Unnamed
Tributary to
Dutch
Buffalo
Creek
Stream Class
Tributary to C
Stream Index Number *
Tributary to 13-
17-11- 5
Total Drainage Area (so
545,371.2
On -site Drainage Area (so
545,371.2
Off -site Drainage Area (so
N/A
[Proposed Impervious Area** (so
61,402
Impervious Area** total
11.3
Impervious— Surface Area
Drainage Area 1
Drainage Area
Drainage Area _
Drainage Area _
On -site Buildings/Lots (sf)
0
On -site Streets (so
61,165
On -site Parking (so
0
On -site Sidewalks (so
0
Other on -site (so
0
Future (so
0
Off -site (so
0
Existing BUA*** (so
237
Total (so:
61,402
* Streant Class and Index Number can be determined at: littp://portal.nedenr.or oebftoq[ps/csu/classificatious
Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
***Report only that amount of existing BUA that will remain after development. Do not report any existing BUA that
is to be removed and which will be replaced by new BUA.
11. How was the off -site impervious area listed above determined? Provide documentation.
Protects in Union County: Contact DEMLR Central OfJwe staff to check if the project is located within a Threatened &
Endangered Species watershed that may be subject to more stringent stormwater requirements as per 15A NCAC 02B .0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
from http://vortal.ncdenr.orq/web/wci/ws/su/bmp-manual.
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Energy, Mineral and
Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application
instruction sheet and BMP checklists are available from
http: /[portal.ncdenr.org/web/wg/ws/su/statesw/forms does. The complete application package should be
submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the
interactive online map athttp://portal.ncdenr.org/web/wq/ws/su/maps.)
Please indicate that the following required information have been provided by initialing in the space provided
for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions
for each submitted application package from hU://portal.ncdenr.org/web/wq/ws/su/statesw/forms does.
Ia
1. Original and one copy of the Stormwater Management Permit Application Form.
2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants
Form. (if required as per Part VII below)
Form SWU-101 Version Oct. 31, 2013 Page 4 of 7

3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M Kr "•
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to 60
http://www.envhelp.org/pages/onestopexpress.html for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/managementfor
the project. This is required in addition to the brief summary provided in the Project
Information, item 1.
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the (x�
receiving stream drains to class SA waters within 1/2 mile of the site boundary, include the 1/2
mile radius on the map.
7. Sealed, signed and dated calculations (one copy). GL/y
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
I. Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal
waters, and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours, proposed contours, spot elevations, finished floor elevations.
I. Details of roads, drainage features, collection systems, and stormwater control measures.
in. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who
made the determination on the plans.
n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations.
o. Drainage areas delineated (included in the main set of plans, not as a separate document).
p. Vegetated buffers (where required).
9. Copy of any applicable soils report with the associated SHWT elevations (Please identify ow
elevations in addition to depths) as well as a map of the boring Iocations with the existing
elevations and boring logs. Include an 8.5"xll" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DEMLR to verifij the SHW P prior
to submittal, [phone].)
10. A copy of the most current property deed. Deed book: 10971 Page No: 0088 (�N
11. For corporations and limited liability corporations (LLC): Provide documentation from the NC 4'
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item la, 2a, and/or 3a per 15A NCAC 2H.1003(e).
The corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application will be returned.
http:/ /www.secretary.state.nc.us/Corporations/CSearch.asl2
Form SWU-101 Version Oct. 31, 2013 Page 5 of

VIL DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from http://portal.ncdenr.org/web/Ir/state-stormwater-
forms does. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, that the covenants will be binding on all parties and persons claiming
under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the NC DEMLR, and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer:Lynn Mathis, Professional Engineer
Consulting Firm: UC Synergetic, LLC
Mailing Address:123 North White Street
City:Fort Mill
Phone: (803 ) 835-7923
Email:[e-mail]
State:SC Zip:29715
Fax: (803 ) 835-7825
LY. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this
section)
I, (print or type name of person listed in Contact Inforniation, item 2a) certify that I
own the property identified in this permit application, and thus give permission to (print or type name of person
listed in Contact Infonnation, item la) with (print or type name of organization listed in
Contact Infornation, item 1a) to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.
Form SWU-101 Version Oct. 31, 2013 Page 6 of 7

As the legal property owner I acknowledge, understand, and agree by my signature below, that if my
designated agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or
defaults on their lease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater
permit reverts back to me, the property owner. As the property owner, it is my responsibility to notify DEMLR
immediately and submit a completed Name/Ownership Change Form within 30 days; otherwise I will be
operating a stormwater treatment facility without a valid permit. I understand that the operation of a
stormwater treatment facility without a valid permit is a violation of NC General Statue 143-213.1 and may
result in appropriate enforcement action including the assessment of cavil penalties of up to $25,000 per day,
pursuant to NCGS 14�3
Signature: �� �%'/ Date: /�SEP7 Z, Z0,'y
I, _ "T o-N ? �� rA I TN a Notar Public for the State of 1 U DRT-0 l Afd ; AIA, County of
(Jnl i 0' i do hereby certify that T� \_ I aStiEF' personally appeared
before me this Z day of � �) I and a�wledge e�ue execution of the application for
a stormwater permit. Witness my hand and official seal /� / J/ 1
SEAL
My commission expires �e - / S- J_0 1 J
X. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in Contact Information, item 1a) Lunn E. Mathis ,
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of the
applicable stormwater rules under 15A NCAC 2H .1000 and any other applicable state stormwater
requirements.
Signature:. 4, we Date:
I, IJ2f nrN a Notary Public for the State of �,K. County of
Me rV�e p do hereby certify that LV�nn F - "i 5 personally appeared
before me this _ day of and acknow a the a ex tion of the application for
a stormwater permit. Witness my hand and official seal,
1
�%% ER „Me
-- +OTA9`
*%a 4%G
SEAL
My commission expires

SUBMITTAL REQUIREMENT VI-5
STORMWATER MANAGEMENT
_►l
SEDIMENT AND EROSION CONTROL
NARRATIVE

iSION OF LAND RESOURCES
NO QUALITY SECTION
UC SYNERGETIC
Innovative Thinking. Engimaed Solutions. FED 10 2015
Storm Water Management Narrative for the Mt Pleasant Substation AND NATURAL RESOURCES
Union Power Cooperative plans to construct a 100,000 volt (100 kV) substation to increase
electrical capacity and reliability in the eastern portion of Cabarrus County. Union Power is committed
to protecting the health, safety, and welfare of the area, which includes the environment and water
resources. Storm water runoff will be controlled per the regulations of the Cabarrus County Phase II —
Post Construction Storm Water Management program.
The 12.52-acre parcel of land is typical of rural piedmont areas and is characterized by silt loam
soils on 2-8 and 8-15 percent slopes, land cover consisting of oak -hickory with scattered pine forests,
and low -density rural development. Two drainage areas run through the site and converge into a
perennial stream on the southern boundary of the site that is a tributary to Dutch Buffalo Creek which
runs approximately 0.76 miles east of the site. The unnamed tributary is not located on current USGS
quadrangle maps, but was delineated by biological consultants Environmental Resources of the
Carolinas, Inc. and verified by the US Corps of Engineers during due diligence studies. In addition,
Cabarrus County requires surface waters buffers, which have been applied.
Site development will include a limited amount of "Built -upon", or impervious area. The
substation pad will covered in uniformly -graded, washed stone. The access drive will be covered in 8"
of compacted crusher-run/"ABC" gravel, while an approximate 60' x 24' asphalt surface will cover the
access drive entrance from Mt Pleasant Rd S. In total, "Built -upon" areas will be limited to 1.41 acres, or
11.3% of the total property. Therefore, the Mt Pleasant Substation qualifies as a low -density project
under the post -construction storm water management model.
Stormwater from Mt Pleasant Road will be conveyed under the site entrance via Culvert #5, a
15" reinforced concrete pipe (RCP). The existing ditch along Mt Pleasant Road will be excavated to only
the extent necessary to allow for positive drainage. The majority of storm water runoff entering the site
will drain from the north and will be conveyed through Culvert # 1, a 36" RCP that allows water to
naturally drain under the access road and through the property. Temporarily, the water conveyed
through Culvert #1 will be intercepted by a temporary skimmer sediment basin. This basin will be
removed once the site is completely stabilized and the area will be graded into a permanent vegetated
swa le.
Storm water from the washed gravel substation pad will be diverted into one of four storm water
conveyance systems. The substation pad will generally shed water in all directions from its highest
point in the center.
1. Oil Containment System: Water that falls in the center of the substation pad will be collected
by the underground oil containment system, which is designed to hold water volumes from a
25-year storm and oil volumes from the largest single vessel. Water from this system will outfall
on the southern end of the substation pad and onto a dissipater pad, then given the

opportunity to sheet flow over planted and naturalized vegetation before reaching the stream
outlet.
2. Storm water that falls on the southern portion of the substation pad will be allowed to sheet
flow over to existing grade and through planted and naturalized vegetation before reaching the
stream outlet.
3. Swale # 1 will collect the majority of water from the substation pad and cut slope. Gently set at
a 2% slope, Swale # 1 will be matted, seeded, and will convey water to Culvert # 1. Once site
stabilization is complete and the temporary skimmer sediment basin is removed, water will be
allowed to drain over Swale #2 before reaching the stream outlet. Storm water uphill from the
cut slope will be permanently conveyed to Culvert # 1 using a cut slope diversion swale.
4. Catch Basin # 1 will collect storm water from eastern portion of the substation pad and release
it onto a dissipater pad. Again, this water will be allowed to drain over Swale #2 before
reaching the stream.
BMP Swale #'s 1&2 will be permanently deeded as drainage easements. In addition, a 20' access
easement will provide necessary access from public rights -of -way to the drainage swales to permit
routine maintenance and inspection.
Sediment and Erosion Control
As previously mentioned, the Mt Pleasant Substation project will disturb approximately 5.91 acres
of land, therefore an erosion and sedimentation control plan must be submitted to the regional
NCDENR office at least 30 days before any land disturbance begins. Appropriate sediment and erosion
control measures have been planned to minimize and control the transportation of sediment.
During construction, minimizing the dislocation of sediment is the first priority. All disturbed slopes
2:1 or greater, 10 feet or more feet of vertical change, or drainage swales are planned to be covered in
erosion control matting. Disturbed slopes will be seeded within 21 days following completion of any
phase of grading. If sedimentation does occur, Union Power's next priority is to control the
translocation of sediment and prevent offsite disturbance. Union Power will implement 5 techniques to
control sedimentation, including:
1. Permanent Diversion Swale: A permanent diversion swale (detail 3) will be utilized uphill of
the substation cut slope, which will serve to redirect storm water away from the substation
pad and through culvert # 1 and into the temporary skimmer sediment basin.
2. Temporary Diversion Swale: A temporary diversion swale (TD) will be utilized on the
southern end of the substation pad to redirect storm water into the temporary skimmer
sediment basin. The TO will be maintained daily with clearing operations and remain in
place during fill operations. In addition, the TO will be appropriately raised and lengthened
(daily if necessary) as the grade of substation pad is built up.

3. Temporary Slope Drains: Two temporary slope drains (TSD) will collect and transport water
into the temporary skimmer sediment basin from the substation pad. One TSD will collect
water from the temporary diversion swale while the second will collect water from the
center of the substation pad.
4. Temporary Skimmer Sediment Basin: The temporary skimmer sediment basin (sediment
basin) will serve as the primary sedimentation collection facility on site. Located in a natural
drainage channel, the sediment basin has been sized appropriately to account for all on site
and off site drainage within the proposed watershed. Following the regulations set by
NCDENR, the sediment basin will be periodically inspected and maintained. After all
disturbed slopes have been stabilized, the sediment basin will be removed and land will be
graded into a vegetated swale. At this time, disturbed soils will be appropriately matted
and seeded to minimize erosion.
5. Silt Fences: Silt fences (in some instances with rock outlets) will be used where sediment -
laden water cannot be diverted into the sediment basin. These primarily include fill slopes
on the southern end of the substation pad and sediment basin embankment.
I would like to thank you for taking the time to review the attached site development plans. If you have
any questions or comments regarding the proposed plan to control storm water or sediment and
erosion control measures, please feel free to contact me.
Sincerely,
/w P
Lynn Mathis,
yP L
uC Synergetic, LLC
123 North White Street
Fort Mill, SC 29715
[phone]

RECEIVED
SEP 2 5 2014
DENR•LAND QUALITY
STORMWATER PERMITTING
SUBMITTAL REQUIREMENT VI-7
STORMWATER BMP CALCULATIONS

MT. PLEASANT SUBSTATION
CABARRUS COUNTY, N(�ECEIVED
SEP 2 5 2014
DENRIAND QUALITY
SEDIMENTATION AND EROSION CONTROL CS��ULf�
OIL CONTAINMENT CALCULATIONS
PREPARED FOR:
UNION POWER COOPERATIVE
1525 ROCKY RIVER RD. N.
MONROE, N.C. 28111-5014
PREPARED BY:
UC SYNERGETIC, LLC
123 NORTH WHITE STREET
FORT MILL, S.C. 29715
9/24/2014
S KR'
7475
�''oNN E. MP o•O
Page 1 of 86

TABLE OF CONTENTS
Skimmer Sediment Basin and Swale 2 Watershed Page 3
Swale and Catch Basin Watersheds Page 4
Skimmer Sediment Basin Calculations Page s
Permanent Swale 2 Calculations
(Replace Sediment Basin)
Page 32
Catch Basin 1 and Culvert 5 Calculations Page 57
Catch Basin 2 and 3 Oil Containment Calculations Page 69
Swale Calculations Page 80
Dissipator Pad Calculations Page 80
Skimmer Sediment Basin Dimensions Page 86
Page 2 of 86

lLC SYNEaGETIC
Innovative Thinking. Engiwoed Solutions.
September 10, 2015
Stormwater Permitting Staff
Attn: Bill Diuguid
North Carolina Department of Environment and Natural Resources
1612 Mail Service Center
Raleigh, NC 27699
Re: Notification of Project Completion
Union Power Cooperative — Mt Pleasant Substation (SW3140901)
Dear Mr. Diuguid:
For your information and records, Union Power Cooperative has completed site development and grading
for their Mt Pleasant electrical substation at 3400 Mt Pleasant Road South near Mt. Pleasant, NC. All
temporary erosion and sedimentation control devices have now been removed and disturbed areas
stabilized with permanent vegetation and/or approved stone surfacing. Per approved plans (dated
September 4, 2014 and September 24, 2014), required vegetative swales/conveyances for stormwater
control have been installed and are functioning, and Union Power is currently in the process of
surveying/recording the associated permanent easements for the measures. A copy of the recorded
easements will be provided to your office within the following 30 days, as required to complete the
permitting process.
Thanks very much for the assistance you and your staff provided during the permitting and construction
process. If you have any questions or require any additional information, please contact me at (803) 835-
7923 or Imathis(c_ucseng.com.
Sincerely,
/We0
Lynn Mathis
®� N E
MAR 2 4 2016
{,c �i^-CEMLR
I_- kwadtq Section
,egional Office
123 North White Street • Fort Mill, SC 29715
P: 803-835-7820 • F: 803-835-7825 • www.ucsinc.com

„Ldls /Qbo-)7)E/vlS

Diuguid, Bill mf�e -SV31* 0 %01 1=t 1
From: Nathan V. Bass <[e-mail]>
Sent: Wednesday, January 27, 2016 12:55 PM
To: Diuguid, Bill
Subject: Mt Pleasant Substation (SW3140901) - Recorded Restrictions
Attachments: Mt Pleasant Stormwater Recorded Restrictions.pdf, 3633 Union Power Mt Pleasant BMP
Plat Recorded.pdf
Mr Diuguid-
Please see the attached copy of the recorded restrictions for the stormwater BMPs that were installed on the Mt
Pleasant Substation site. If a copy via email is not sufficient please let me know and I'll be happy to send a hard copy
through the mail.
Thanks!
Nathan V. Bass, PLA
UC SYNERGETIC
Facilities Planning and Siting
UC Synergetic, LLC (a Pike Company)
123 North White Street
Fort Mill, SC 29715
704-576-3499 Cell
803-835-7929 Office
803-835-7825 Fax
nbassreDucsene.com
.,�IIVE®
MAR S 4 2016
�c CEMLR
�j Section
—ional Office
The information contained in this electronic message is information intended for the use of only the individual or entity named above and may be
PRIVILEGED and CONFIDENTIAL. If the reader of this message is not the intended recipient or the employee or agent responsible for delivering it to
the recipient, you are hereby notified that any review, disclosure, dissemination, distribution, or copying of this communication is strictly prohibited. If you
received this electronic message in error, please notify the sender immediately by replying to this e-mail and permanently delete the original message.
Thank you.

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