NC0081931_Renewal Application_20171218

6 CUBE HYDRO'
CAROLINAS
December 18, 2017
Mr. Sergei Chernikov, Ph.D.
North Carolina Department of Environmental Quality
Division of Water Resources
WQ Permitting Section
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: NPDES Permit Application — Minor Industrial
Cube Yadkin Generation LLC
High Rock Powerhouse - NCO081931
Dear Mr. Chernikov:
Cube Hydro Carolinas LLC
Highway 740
PO Box 575
Badm, NC 28009-0575
RECEIVED%gW�Rl
DEC 21.201'
Water Resources
Permitting Section
Cube Yadkin Generation LLC (Cube) is submitting the enclosed National Pollutant
Discharge Elimination System (NPDES) — Minor Industrial Permit Application for a new
Outfall 005 which will include discharge to the Yadkin River from the station separation
tank / skimmer located on the turbine floor at Unit 3.
As you discussed with GEL Engineering of NC, Inc. (GEL) on a conference call on October
11, 2017, no engineering alternatives analysis is required for this project. Additionally,
as noted in North Carolina Session Law 2011-394, an Authorization to Construct (ATC)
permit is no longer required for construction work at power generation facilities with an
NPDES permit. Since Cube's High Rock Powerhouse is a power generation operation, no
ATC permit is needed.
If you have any questions regarding this submittal, please don't hesitate to contact Keith
McCullock of GEL at [phone] or Paul Tran with Cube at [phone].
Very Truly Yours
IN,
Attachments

Engineering of NC INC
an affiliate of The GEL Group INC
NPDES PERMIT No. NCO081931 MODIFICATION
ADDITION OF OUTFALL 005 -
UNIT Nos. 1-3 SUMP DISCHARGE
High Rock Powerhouse
Cube Yadkin Generation LLC
Davidson County, North Carolina
Prepared by:
GEL Engineering of NC, Inc.
2700 Sumner Boulevard, Suite 106
Raleigh, North Carolina 27616
NC Corporate Engineering License No. C-1938
DECEMBER 2017
i

NPDES PERMIT No. NCO081931 MODIFICATION
ADDITION OF OUTFALL 005 - UNIT Nos. 1-3 SUMP DISCHARGE
HIGH ROCK POWERHOUSE
CUBE YADKIN GENERATION LLC
DAVIDSON COUNTY, SOUTH CAROLINA
Table of Contents
Section Subiect Page
Summary
10 Overview of Permit Application............................................................. 1
2.0 Project Description................................................................................ 1
NPDES Permit Application — Short Form C — Minor Industrial
Figures
1 Site Location Map
2 Process Flow Diagram for High Rock Powerhouse
Appendix
I Manufacturer Information for Separation Tank / Skimmer

NPDES PERMIT No. NC0081931 MODIFICATION
ADDITION OF OUTFALL 005 - UNIT Nos. 1-3 SUMP DISCHARGE
HIGH ROCK POWERHOUSE
CUBE YADKIN GENERATION LLC
ROWAN COUNTY, SOUTH CAROLINA
1.0 OVERVIEW OF PERMIT APPLICATION
Cube Hydro Generation LLC (Cube Hydro) operates the High Rock Powerhouse located on
the Yadkin River in Davidson County, North Carolina. Cube Hydro currently operates
under NPDES Permit No. NC0081931 issued by the North Carolina Department of
Environmental Quality (NCDEQ) Division of Water Resources on February 22, 2017. The
High Rock Powerhouse currently has four permitted outfalls. Outfalls 001, 002 and 003
discharge once -through cooling water. Outfall 004 discharges stormwater (periodically)
from the secondary containment for transformers. Cube Hydro intends to add Outfall
005 which will discharge treated wastewater from the Unit Nos. 1-3 sumps. A project
description is included in Section 2.0.
The location of the Cube Hydro facility is shown on the site location map included as
Figure 1.
2.0 PROJECT DESCRIPTION
For this proposed project, Cube Hydro plans to install a cooling water rotary strainer and
two turbine guide bearing filtration packages. Back flush from the cooling water rotary
strainer and two turbine guide bearing filtration packages will be discharged to the
Yadkin River. As noted in Title 15A of the North Carolina Administrative Code 2H .0106
(f), filter backwash from raw water intake screening devices do not require a NPDES
permit. Therefore, the backflush discharges from the cooling water rotary strainer and
two turbine guide bearing filtration packages do not need to be included in the High Rock
Powerhouse's NPDES's permit.
Cube Hydro plans to install Outfall 005 which will include discharge to the Yadkin River
from the station separation tank / skimmer located on the turbine floor at Unit 3. The
separation tank will have a total capacity of 350 gallons. The separation tank will have a
rope skimmer, oil baffle and discharge oil monitor which can shut down the system if oil
is detected in the discharge. Total separator discharge flow is dependent on unit
leakage. Two new 25 gallon per minute (gpm) sump pumps will be installed in each
wheelpit for a total unit discharge capacity of 50 gpm. Since the unit head cover sump
flows are variable dependent upon unit seal wear the station sump tank / skimmer
system will be designed for a constant flow of 50 gpm for all three units. However, daily
flow will not exceed 10,000 gallons per day. All equipment will be located on the turbine
floor inside the powerhouse. Outfall 005 will be core drilled through the floor into the
existing trash chute. A sample connection tap will be provided.
cube00117

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number INCOO 81931
If you are completing this form to computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise, please print or type.
1. Contact Information:
Owner Name
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
Cube Yadkin Generation LLC
High Rock Powerhouse
P. O. Box 575
Badin
N. C. 28009
[phone]
[phone]
[e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road
City
State / Zip Code
County
3344 Bringle Ferry Road
Denton
N. C. 27239
Davidson
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name Cube Yadkin Generation LLC
Mailing Address P. O. Box 575
City Badm
State / Zip Code N. C. 28009
Telephone Number [phone]
Fax Number [phone]
Page 1 of 4 C -MI 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
4. Ownership Status:
Federal ❑ State ❑ Private ® Public ❑
S. Standard Industrial Classification (SIC) code(s): 4911
6. Number of employees: 4
7. Describe the treatment system List all installed waste treatment components with capacities,
describe the processes that generate wastewaters. If the space provided is not sufficient attach a
separate sheet of paper with the system description.
See Attached Flow Diagram
S. Is facility covered under federal effluent limitation guidelines? No ❑ Yes
If yes, specify the category?
9. Principal product(s) produced: Electricity
Principal raw material(s) consumed: NA
Briefly describe the manufacturing process(es):
Hydroelectric generation
10. Amount of principal product produced or raw material consumed
(List specific amounts consumed and/or units of production over the last three uears)
11. Frequency of discharge: Continuous ❑ Intermittent
If intermittent:
Days per week discharge occurs: Seven (7) Duration:
Page 2 of 4 C -MI 03/05
Product Produced or Raw Material
Consumed
AVERAGE
Product Produced or Raw Material
Consumed
PEAK
per Day
415 MW
852 MW
per Month
12,625 MW
25,915 MW
per Year
1151,503 MW
310,980 MW
11. Frequency of discharge: Continuous ❑ Intermittent
If intermittent:
Days per week discharge occurs: Seven (7) Duration:
Page 2 of 4 C -MI 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
12. Types of wastewater discharged to surface waters only
Discharge
Flow
GALLONS PER DAY
Sanitary - monthly average
NA
Utility water, etc. - monthly average
NA
Process water - monthly average
10,000
Stormwater - monthly average
NA
Other - monthly average
Explain- Cooling Water
51,840
Monthly Average
total discharge (all types)
61,840
13. Number of separate discharge points: 5
Outfall Identification number(s) 001, 002, 003, 004 and 005
14. Name of receiving stream(s) (Provide a map shounng the exact location of each outfall, including
latitude and longitude):
Yadkin River
15. Effluent Data
Provide data for the parameters listed Temperature and pH shall be grab samples, for all other parameters 24-hour
composite sampling shall be used If more than one analysis is reported, report daily maximum and monthly average.
If only one analysis is reported, report as daily maximum
Parameter
Daily
Maximum
Monthly
Average
Units of
Measurement
Biochemical Oxygen Demand (BODS)
< 2.0
NA
mg/l
Chemical Oxygen Demand (COD)
NA
NA
NA
Total Organic Carbon
NA
NA
NA
Total Suspended Solids
4.18
NA
mg/l
Ammonia as N
NA
NA
NA
Temperature (Summer)
NA
NA
NA
Temperature (Winter)
NA
NA
NA
pH
7.9
7.4
Units
Fecal Coliform (If sanitary waste is
present)
NA
NA
NA
Total Residual Chlorine (if chlorine is
used)
NA
NA
NA
Page 3 of 4 C -MI 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
16. List all permits, construction approvals and/or applications (check all that apply and provide permit
numbers or check none zf not applicable):
Type Permit Number Type Permit Number
Hazardous Waste (RCRA)
UIC (SDWA)
NPDES
PSD (CAA)
NA
W
NESHAPS (CAA)
Ocean Dumping (MPRSA)
NA
NA
NCO081931 Dredge or fill (Section 404 or CWA) NA
NA Other NA
Non -attainment program (CAA) NA
17. List any chemicals that may be discharged (Please list and explain source and potential
amounts.)
Oil & Grease 8.61 mg/l - Outfall 005 (new proposed outfall - oil separator & tank skimmer)
18. Is this facility located on Indian country? (check one)
Yes ❑ No
19. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
Printed name of Person
Title
Date
North CaroliV General Statute 143-215 6 (b)(2) provides that. Any person who knowingly makes any false
statement representation, or certification in any application, record, report, plan, or other document files or
required to be maintained under Article 21 or regulations of the Environmental Management Commission
implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or
monitoring device or method required to be operated or maintained under Article 21 or regulations of the
Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable
by a fine not to exceed $25,000, or by imprisonment not to exceed six months, or by both (18 U S C Section
1001 provides a punishment by a fine of not more than $25,000 or imprisonment not more than 5 years, or both,
for a similar offense.)
Page 4 of 4 C -MI 03/05

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• 1 ' 0' 800' 1600' 3200' "DRAWING TAKEN FROM USGS 7.5 MINUTE TOPOGRAPHIC MAP (HIGH ROCK, NC QUADRANGLE)" ti
PROJECT: cube00217
® Engineering of NC INC CUBE YADKIN GENERATION LLC
an affiliate of THE GEL GROUP INC HIGH ROCK POWERHOUSE SITE LOCATION FIGURE
6 ENVIRONMENTAL ■ ENGINEERING ■ SURVEYING 6541 Meridien Drive, Suite 101 BRINGLE FERRY ROAD MAP 1
Raleigh, NC 27616 ROWAN COUNTY, NC
919.544.1100
problem solved w .gel=m DATE: November 21, 2017 DRAWN BY: TJP APPRV. BY: KDM

FLOW DIAGRAM FOR HIGH ROCK POWERHOUSE
NPDES PERMIT NO. NCO081931
Yadkin River
High Rock High Rock High Rock
Unit One Unit Two Unit Three
Scroll Case Scroll Case Scroll Case
Unit One Unit Two Unit Three
Thrust Bearing Thrust Bearing Thrust Bearing
Cooling Water I I Cooling Water I I Cooling Water
Outfall 001 Outfall 002 Outfall 003
Into Yadkin River Into Yadkin River Into Yadkin River
(17,280 gal/day) (17,280 gal/day) 1 1 (17,280 gal/day)
Unit Nos. 1-3
Wheelpits
Discharges
Stormwater
Secondary Oil Separator
Containment for Tank &
Transformers I I Skimmer
Oil to Drum
Outfall 004 Outfall 005
Into Yadkin River Into Yadkin River
(Flow Varies) I 1 (10,000 gal/day)

APPENDIX I
MANUFACTURER INFORMATION FOR SEPARATION TANK/SMIMMER

12800 York Rd., Cleveland, OH 44133 USA
OIL KIMMEZS, IPIC: PH: [phone] FAX: [phone]
S" 1, ;,, 3ra.jwrts' [e-mail] I www.ollskim.com
Date: 17 -Aug -17
�- Quote # E79081717
To: HDR
IM
440 South Church St, Suite 1000
Charlotte, NC 28202
Attn: David Summers
TANK [phone]
Delivery 8 weeks
FOB Cleveland , Ohio 44133
Payment Terms Net 30
Product of USA Ship Via Freight - Prepay/Add
Prices Valid To: 17 -Oct -17
ITEM
QTY DESCRIPTION EACH TOTAL
A
Oil Skimmers Inc. SAS Oil Removal System $35,800.00
535.800.00
"Separate and Skim" Complete with Oil Leak Detector
to include:
Separation Tank
..To accept flow from customer sump at 8 gpm
...Designed for droplets 20 microns with Reynolds Number <500
..Size 60 x 40 x 40 inches
..Material 304 SS - 12 gauge
..Mounted on channels
..Inlet Coupling with down pipe
..Baffle/Weir to trap separated oil
..Clean Water Pump out Chamber
..Outlet Flange 2 inch - Designed to maintain 12" water level
..2" Butterfly Valve Wafer Flange Design, EPDM Liner Seal,
Painted Iron Body, Stainless Steel Disc and Shaft ANSI Class 150
Direct Actuator Mount Pad
..Mounting bracket for Model 1H & Decanter
..Open/Close Electric Actuator for operating valve
310 Ib -in Torque 7-8 Second Operation
Sealed IP65 Plastic Housing
As supplied by CR -TEC Engineering
Oil Skimmers Inc. Model 1H Oil Skimmer
Complete with 120 V Motor Wired to Control Panel
Decanting System
System Designed, Engineered and Constructed to accept
Leakwise ID -221 Detector , PS-220/NR/RLIL1 Processor
1M 316 SS Stilling Well Base and ID-221/ID-225 Calibration Tube
Supply, Installation and Wiring of I
Leakwise ID -221 Detector, PS-220/NR/RL/L1 Processor
1M 316 SS Stilling Well Base and ID -221/113-225 Calibration Tube
Control Panel NEMA 4X Enclosur To Contain:
OFF/ ON for Oil Skimmer Model 1H Motor
Power Supply for Leakwise Detector
Relay for Valve Electric Actuator Operation
Mounted and wired into system
System Packaged in Wooden Box
Concept of Design ----
System Designed to accept flow from customer sump
Allow for gravity separation of oil/water
Model 1H Oil Skimmer to continously remove separated oil
decant and discharge into Customer Collection Tank
From Clean Water Section Customer to pump or gravity discharge water
Leak detection system installed in Clean Water Section. If oil
detected - Signal will be sent to CLOSE THE VALVE.
Control of the customer pumps NOT provided.
TOTAL $35,800.00
Jim Hebert
Quote Prepared By