WQ0041112_Application (FTSE)_20190813

Airgas. NC Department of
an Air Liquide company Environmental Quality
Received
August 5,2019 - AUG 13 2U115
Winston-Salem
State of North Carolina Department of Environmental Quality I~ Regional Office
Division of Water Resources
Winston-Salem Regional Office
450 West Hanes Mill Road, Suite 300
Winston-Salem,NC 27105
Attention: Justin Henderson
Environmental Specialist II
Subject: Fast Track Sewer System Extension Application for a Pump Station Permit
Airgas USA, LLC—Mebane,NC ASU
Mebane, Alamance County,North Carolina
Dear Mr. Henderson:
Airgas USA, LLC (Airgas), an Air Liquide Company,plans to construct and operate a pump station at the
new Air Separation Unit (ASU) plant facility (SIC 2813) in Mebane, Alamance County, North Carolina.
The ASU plant facility is currently under construction.
Airgas is submitting one(1)original application and one (1)copy of the application for a sewer permit for
construction and operation of the pump station in Mebane, North Carolina. The application package
includes the following:
• Cover letter(this letter);
• Signed and certified Form FTA 04-16 (Fast Track Sewer System Extension Application)
(Attachment 1);
• Registration documentation for business with the North Carolina Secretary of State (Attachment
IA);
• Signed and certified Form FTSE 04-16 (Flow Tracking/Acceptance for Sewer Extension
Applications)provided by the City of Mebane(Attachment 2);
• Site Maps including a USGS topographic map and a street level site location map (Attachment 3);
• Pump station design narrative(Attachment 4); and
• Application fee in the amount of$480 payable to North Carolina Department of Environmental
Quality(NCDEQ)(Attachment 5)
The instructions for Form FTA 04-16 serve as a checklist. Of the items required to be submitted in the
instructions, it is determined in accordance with our review of the requirements that the following items
are not applicable and therefore they are not included in the application package:
• G. Existing Permit(All Modification Packages).
• H. Power Reliability Plan(Required if portable reliability option utilized for Pump Station).
• 1. Certification of Public Convenience and Necessity (All application Packages for Privately-
Owned Public Utilities).
• J. Operational Agreements(Applications form HOA/POA and Developers for lots to be sold).
I

Airgas Permit Application for the Pump Station
August 5, 2019
Page 2 of 8
Airgas USA, LLC is registered for business with the North Carolina Secretary of State. The Secretary of
State Identification Number for Airgas USA, LLC is 1296950. The information provided by the North
Carolina Secretary of State web page is included in the application package.
The City of Mebane has agreed and approved to accept Airgas' industrial wastewater into its wastewater
treatment plant and has provided the completed and certified Form FTSE 04-16.
Please note that the pump station design narrative is not required but submitted to support this permit
application document. Design items presented in the narrative are reflected in the engineering design
drawings.
The site has a National Pollutant Discharge Elimination System (NPDES) and Soil Erosion and Sediment
Control (E&SC) Plan for construction. The construction of the pump station and force main will comply
with the current NPDES Permit and E&SC Plan for construction.
We trust that the information presented in the application package is sufficient for review and approval.
In accordance with the overall facility's construction schedule, the ASU plant is scheduled to start up by
the end of October 2019 and therefore, we would like to receive the permit for the construction and
operation of the proposed pump station as quickly as possible so that the procurement of key equipment
units and the construction of the pump station and pipeline can take place immediately thereafter.
If you have any questions about the permit application package and/or need additional information, please
contact Mr. Stephen Kim, our environmental consultant, at (215) 941-2770 or at
[e-mail] or me at(713) 835-2134 or at [e-mail].
Sincerely,
Eric Alvarenga
Project Manager
cc: File
Stephen Kim -GETI

State of North Carolina
Department of Environmental Quality
DW. R Division of Water Resources
15A NCAC 02T.0300—FAST TRACK SEWER SYSTEM EXTENSION APPLICATION
Division of Water Resources FTA 04-16&SUPPORTING DOCUMENTATION
Application Number: (to be completed byDWR)
All items must be completed or the application will be returned
1. APPLICANT INFORMATION:
I. Applicant's name: Airgas USA,LLC(company,municipality,HOA,utility,etc.)
2. Applicant type: ❑ Individual ® Corporation ❑General Partnership ❑ Privately-Owned Public Utility
❑Federal ❑State/County ❑Municipal ❑Other
3. Signature authority's name: Thomas Stringer per 15A NCAC 02T.0106(b)
Title: Vice President.Production&Project Execution AMG NC Department of
4. Applicant's mailing address:314 Lake Latham Road Environmental Quality
Received
City: Mebane State:NC Zip:27302- AUG 1 3 2019 I
I
5. Applicant's contact information: -
Phone number: [phone] Email Address: eric.alvarengapairliquide com Winston-Salem
11. PROJECT INFORMATION:
Regional Office
I. Project name:Airpas Mebane ASU
2. Application/Project status: ®Proposed(New Permit) ❑ Existing Permit/Project
If a modification,provide the existing permit number: WQOONA and issued date: NA
If new construction but part of a master plan,provide the existing permit number: W0000
3. County where project is located:Alamance
4. Approximate Coordinates(Decimal Degrees): Latitude: 36.091675' Longitude:-79,296176'
5. Parcel ID(if applicable): 9815221927&9815215333
(or Parcel ID to closest downstream sewer)
111. CONSULTANT INFORMATION:
1. Professional Engineer:Gaby E.Iskanadar License Number: 046349
Firm: WorlevParsons,Inc.
Mailing address: 101 E.Huntington Drive
City:Monrovia State: CA Zip: 91016-
Phone number: [phone] Email Address:gabv.iskandar(rilwoleypatsons.com
IV. WASTEWATER TREATMENT FACILITY(WWTF)INFORMATION:
1. Facility Name: City of Mebance Warter Resorce Recovertv Facility Permit Number:NCO021474
Owner Name: City of Mebane
V. RECEIVING DOWNSTREAM SEWER INFORMATION(if different than WWTF):
1. Permit Number(s): WQ_ Downstream(Receiving)Sewer Size: inch
System Wide Collection System Permit Number(s)(if applicable): WQCS??
Owner Name(s):
FORM: FTA 04-16 Page 1 of 5

VI. GENERAL REQUIREMENTS
I. If the Applicant is a Privately-Owned Public Utility,has a Certificate of Public Convenience and Necessity been attached?
❑Yes NNo ❑N/A
2. If the Applicant is a Developer of lots to be sold,has a Developer's Operational Agreement(FORM:DEVI been attached?
❑Yes NNo ❑N/A
3. If the Applicant is a Home/Property Owners,Association,has an Operational Agreement(FORM: HOA)been attached?
❑Yes NNo ❑N/A
4. Origin of wastewater:(check all that apply):
❑Residential Owned ❑Retail(stores,centers,malls) ❑Car Wash
❑Residential Leased ❑ Retail with food preparation/service ❑Hotel and/or Motels
❑ School/preschool/day care ❑Medical/dental/veterinary facilities ❑Swimming Pool/Clubhouse
❑Food and drink facilities ❑Church ❑ Swimming Pool/Filter Backwash
N Businesses/offices/factories ❑Nursing Home ❑Other(Explain in Attachment)
5. Nature of wastewater: 0%Domestic/Commercial %Commercial
100%Industrial(See 15A NCAC 02T.0103(20))
),Is there a Pretreatment Program in effect? N Yes ❑No
6. Hasa flow reduction been approved under 15A NCAC 02T.0114(f)? ❑Yes []No
➢ If yes provide a copy of flow reduction approval letter
7. Summarize wastewater generated by project:
Establishment Type(see 02T.01140 Daily Design Flow a,b No.of Units Flow
Cooling tower(CT)blowdown 39,000 gal/day N/A 39,000 GPD
Side stream filter bachwas water 3,000 gal/day N/A 3,000 GPD
Misc. use-eye wash,emergency shower Negligible gal/day N/A Negligible GPD
Compressor condensate 3,000 gal/day N/A 3,000 GPD
Washdown/drains from truck shop/ 300 gal/day N/A 300 GPD
compressor buildin
Stormwater from the truck scale area 396 gal/day N/A 396 GPD
Total 45,696 GPD
a See 15A NCAC 02T.0114(b). (d).(e)(1)and (e)(2)for caveats to wastewater design flow rates (i.e., minimum flow per
dwelling; proposed unknown non-residential development uses; public access facilities located near high public use
areas; and residential property located south or east of the Atlantic Intracoastal Waterway to be used as vacation rentals
as defined in G.S.42A-4).
b Per 15A NCAC 02T .0114(c), design flow rates for establishments not identified [in table 15A NCAC 02T.01141 shall
be determined using available flow data,water using fixtures,occupancy or operation patterns,and other measured data. j
8. Wastewater generated by project:45696 GPD(per 15A NCAC 02T.0114)
➢ Do not include future flows or previously permitted allocations
If permitted flow is zero, indicate why:
❑Pump Station or Gravity Sewer where flow will be permitted in subsequent permits that connect to this line
❑Flow has already been allocated in Permit Number:
❑Rehabilitation or replacement of existing sewer with no new flow expected
❑Other(Explain):
FORM: FTA 04-16 Page 2 of 5

VIL GRAVITY SEWER DESIGN CRITERIA(If Applicable)-02T.0305&MDC(Gravity Sewers):
1. Summarize gravity sewer to be permitted:
Size(inches) Length(feet) Material
N/A
➢ Section II& III of the MDC for Permitting of Gravity Sewers contains information related to design criteria
➢ Section III contains information related to minimum slopes for gravity sewer(s)
➢ Oversizing lines to meet minimum slope requirement is not allowed and a violation of the MDC
VI►I. PUMP STATION DESIGN CRITERIA(If Applicable)—02T.0305& MDC(Pump Stations/Force Mains):
COMPLETE FOR EACH PUMP STATION INCLUDED IN THIS PROJECT
I. Pump station number or name: Industrial Wastewater Pump Station
2. Approximate Coordinates(Decimal Degrees): Latitude:36.091607' Longitude:-79.294443'
3. Design flow of the pump station: 0.115 (based on the pump capacity)millions gallons per day(firm capacity)
4. Operational point(s)of the pump(s): 80 gallons per minute at 13 feet total dynamic head(TDH)
5. Summarize the force main to be permitted(for this Pump Station):
Size(inches) Length(feet) Material
4 App. 281 PVC
6. Power reliability in accordance with 15A NCAC 02T 0305(h)(I):
® Standby power source or pump with automatic activation and telemetry- 15A NCAC 02T.0305(h)(1)(B):
➢ Required for all pump stations with an average daily flow greater than or equal to 15,000 gallons per day
➢ Must be permanent to facility
Or if the pump station has an average daily flow less than 15,000 gallons per day:
❑ Portable power source with manual activation,quick-connection receptacle and telemetry- 15A NCAC 02T
.0305(h)(1)(C)
or
❑ Portable pumping unit with plugged emergency pump connection and telemetry- 15A NCAC 02T.0305(h)(1)(C):
➢ It shall be demonstrated to the Division that the portable source is owned or contracted by the applicant(draft agreement)
and is compatible with the station.
➢ If the portable power source or pump is dedicated to multiple pump stations, an evaluation of all the pump stations'
storage capacities and the rotation schedule of the portable power source or pump, including travel timeframes, shall be
provided in the case of a multiple station power outage.
FORM: FTA 04-16 Page 3 of 5

IX. SETBACKS&SEPARATIONS—(02B.0200& 15A NCAC 02T.0305(I)):
1. Does the project comply with all separations found in 15A NCAC 02T.0305(f)&N ® Yes ❑No
➢ 15A NCAC 02T.0305 contains minimum separations that shall be provided for sewers stems:
Setback Parameter* Separation Required
Storm sewers and other utilities not listed below vertical 24 inches
Water mains vertical-water over sewer including in benched trenches 18 inches
Water mains horizontal 10 feet
Reclaimed water lines vertical-reclaimed over sewer 18 inches
Reclaimed water lines horizontal-reclaimed over sewer 2 feet
"Any private or public water supply source, including any wells, WS-I waters of Class I or
Class II impounded reservoirs used as a source of drinking water 100 feet
"Waters classified WS(except WS-I or WS-V),B,SA,ORW,HQW,or SB from normal
high water or tide elevation and wetlands see item IX.2 50 feet
"Any other stream,lake,impoundment,or ground water lowering and surface drainage
ditches 10 feet
Any building foundation 5 feet
Any basement 10 feet
Top slope of embankment or cuts of 2 feet or more vertical height 10 feet
Drainage systems and interceptor drains 5 feet
Any swimming pools 10 feet
Final earth grade(vertical) 36 inches
➢ 15A NCAC 02T.0305(g)contains alternatives where separations in 02T.0305(f)cannot be achieved.
➢ "Stream classifications can be identified using the Division's NC Surface Water Classifications webnage
➢ If noncompliance with 02T.0305(f)or(g),see Section X of this application
2. Does the project comply with separation requirements for wetlands?(50 feet of separation) ❑ Yes ❑No ®N/A
➢ See the Division's draft separation requirements for situations where separation cannot be meet
➢ No variance is required if the alternative design criteria specified is utilized in design and construction
➢ As built documents should reference the location of areas effected
3. Does the project comply with setbacks found in the river basin rules per 15A NCAC 02B .0200? ❑ Yes ❑No ®N/A
➢ This would include Trout Buffered Streams per 15A NCAC 213.0202
4. Does the project require coverage/authorization under a 404 Nationwide or ❑ Yes ®No
individual permits or 401 Water Quality Certifications?
➢ Information can be obtained from the 401 &Buffer Permitting Branch
5. Does project comply with 15A NCAC 02T.0105(c)(6)(additional permits/certifications)? ®Yes [-]No
Per 15A NCAC 02T 0105(c)(6), directly related environmental permits or certification applications are being prepared, have
been applied for, or have been obtained. Issuance of this permit is contingent on issuance of dependent permits (erosion and
sedimentation control plans,stormwater management plans,etc.).
6. Does this project include any sewer collection lines that are deemed"high-priority?"
Per 15A NCAC 02T.0402,"high-priority sewer"means"any aerial sewer, sewer contacting surface waters, siphon, or sewer
positioned parallel to streambanks that is subject to erosion that undermines or deteriorates the sewer.
❑Yes ®No ❑N/A
➢ If yes, include an attachment with details for each line, including type(aerial line,size,material,and location).
High priority lines shall be inspected by the permittee or its representative at least once every six-months and
inspections documented per 15A NCAC 02T.0403(a)(5)or the permitee's individual System-Wide Collection permit.
FORM: FTA 04-16 Page 4 of 5

X. CERTIFICATIONS:
I. Does the submitted system comply with 15A NCAC 02T,the Minimum Design Criteria for the Permitting of Pump Stations
and Force Mains(latest version),and the Gravity Sewer Minimum Design Criteria(latest version as applicable?
® Yes ❑No
If No, complete and submit the Variance/Altemative Design Request application (VADC 10-14) and supporting documents
for review. Approval of the request is required prior to submittal of the Fast Track Application and supporting
documents.
2. Professional Engineer's Certification:
I Gaby Iskandar
attest that this application for
(Professional Engineer's name from Application Item III.1.)
has been reviewed by me and is accurate, complete and consistent with the information supplied in the plans, specifications,
engineering calculations,and all other supporting documentation to the best of my knowledge. I further attest that to the best
of my knowledge the proposed design has been prepared in accordance with the applicable regulations, Gravity Sewer
Minimum Design Criteria for Gravity Sewers (latest version), and the Minimum Design Criteria for the Fast-Track
Permitting of Pump Stations and Force Mains (latest version). Although other professionals may have developed certain
portions of this submittal package, inclusion of these materials under my signature and seal signifies that 1 have reviewed this
material and have judged it to be consistent with the proposed design.
NOTE - In accordance with General Statutes 143-215.6A and 143-215.613, any person who knowingly makes any false
statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor, which may
include a fine not to exceed$10,000,as well as civil penalties up to$25,000 per violation.
:................................. t
..
North Carolina Professional Engineer's seal,signature,and date: \,,SIN CARO/*
�.r y•,�
;a SEAL
046349 -
E.
180.
11/2019
:.........�... .. VFW �"
3. Applicant's Certification per 15A NCAC 02T.0106(b):
Qn t
I,�� S n • STr t Oq Ql, V Pfi/Y1ar j Pr6d tAc,4q vN)dtyd�PfJ� attest that this application for
(Signature Autho? 's name&title from Mpplication Item I.3.) C- xlc 4`H Oil
has been reviewed by me and is accurate and complete to the best of my knowledge. 1 understand that if all required parts of
this application are not completed and that if all required supporting documentation and attachments are not included, this
application package is subject to being returned as incomplete. 1 understand that any discharge of wastewater from this non-
discharge system to surface waters or the land will result in an immediate enforcement action that may include civil penalties,
injunctive relief, and/or criminal prosecution. I will make no claim against the Division of Water Resources should a
condition of this permit be violated. I also understand that if all required parts of this application package are not completed
and that if all required supporting information and attachments are not included, this application package will be returned to
me as incomplete.
NOTE - In accordance with General Statutes 143-215.6A and 143-215.6E, any person who knowingly makes any false
statement, representation, o5 certification in any application package shall be guilty of a Class 2 misdemeanor, which may
include a fine not to exce A$10,000 as well as civil penalties up to$25,000 per violation.
i
Signature: Date: L D
FORM: FTA 04-16 Page 5 of 5

State of North Carolina
PWR
Department of Environmental Quality
N Division of Water Resources
plvlsion of Water Resources Flow Tracking/Acceptance for Sewer Extension Applications
(FTSE 04-16)
Entity Requesting Allocation: City of Mebane
Project Name for which flow is being requested: Air Gas
More than one FINE may be required for a single project if the owner of the WWTP is not responsible for all pump
stations along the route of the proposed wastewater flow.
I. Complete this section only if you are the owner of the wastewater treatment plant.
a. WWTP Facility Name: City of Mebane
b. WWTP Facility Permit M NC0021474
c. WWTP facility's permitted flow 2.5 All flows are in MGD
d. Estimated obligated flow not yet tributary to the WWTP .611
e. WWTP facility's actual avg. flow 1.45
f. Total flow for this specific request 0.0480 MGD ra
g. Total actual and obligated flows to the facility 2.061
h. Percent of permitted flow used 82% E
II. Complete this section for each pump station you are responsible for along the route of this
proposed wastewater flow.
List pump stations located between the project connection point and the WWTP:
(A) (D) (C) (D)=(B+C) (E)=(A-D)
Design Obligated,
Pump Average Daily Approx. Not Yet Total Current
Station Firm Flow** Current Avg. Tributary Flow Plus
(Name or Capacity, * (Firm/pl), Daily Flow, Daily Flow, Obligated Available
Number) MGD MGD MGD MGD Flow Capacity***
Fieldstone 1.58 .633 .372 .132 .504 0.129
* The Firm Capacity of any pump station is defined as the maximum pumped flow that
can be achieved with the largest pump taken out of service.
**Design Average Daily Flow is the firm capacity of the pump station divided by a peaking
factor(pf)not less than 2.5.
***A Planning Assessment Addendum shall be attached for each pump station located
between the project connection point and the WWTP where the Available Capacity is<0.
Downstream Facility Name(Sewer): City of Mebane-NCIC Phase 3
Downstream Permit Number:
Page 1 of 6
FTSF.04-1 F

III. Certification Statement:
I Chris Rollins Acting City Manager certify to the best of my knowledge that the addition of
the volume of wastewater to be permitted in this project has been evaluated along the route to the
receiving wastewater treatment facility and that the flow from this project is not anticipated to
cause any capacity related sanitary sewer overflows or overburden any downstream pump station
en route to the receiving treatment plant under normal circumstances, given the implementation of
the planned improvements identified in the planning assessment where applicable. This analysis
has been performed in accordance with local established policies and procedures using the best
available data. This certification applies to those items listed above in Sections I and II plus all
attached planning assessment addendums for which I am the responsible party. Signature of this
form indicates acceptance of this wastewater flow.
Signing Offlcial Signature Date
Page 2 of 6
FTSE 04-16

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NC 2016 2025 Development Center Drive, Mebane, NC 27302

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r cqcu a NorthcarolnaSecretaryofStateSearchResults
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Add Entity to My Email Notification List • View Filings • Print a Pre-Populated Annual Report form • Print
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Limited Liability Company
Legal Name
Airgas USA, LLC
Information
Sosld: 1296950
Status: Current-Active
Annual Report Status: Current
Citizenship: Foreign
Date Formed: 1/16/2013
State of Incorporation:
DE
Registered Agent: CT Corporation System
Addresses
Reg Office Reg Mailing Mailing
160 Mine Lake Ct Ste 200 160 Mine Lake Ct Ste 200 Suite 100,259 N. Radnor-Chester Rd.
Raleigh, NC 27615-6417 Raleigh, NC 27615-6417 Radnor, PA 19087-5283
Principal Office
Suite 100,259 N. Radnor-Chester Rd.
Radnor, PA 19087-5283
Company Officials
All LLCs are managed by their managers pursuant to N.C.G.S. 57D-3-20.
Manager Manager
Andrew R. Cichocki Nicolas Droin
259 N. Radnor-Chester Road, Ste 100 Suite 100,259 N. Radnor-Chester Rd.
Radnor PA 19087 Radnor PA 19087-5283
https://w .sosnc.gov/online_services/search/Business_Registration_Results 112

7/24/2019 North Carolina Secretary of State Search Results
Manager
Pascal Vinet
259 N. Radnor-Chester Road, Ste 100
Radnor PA 19087
https://w .sosnc.gov/online_services/search/Business_Registration_Results 2/2

Airgas USA, LLC—Mebane, NC ASU
Permit Application for the Pump Station
PUMP STATION DESIGN NARRATIVE
Airgas USA, LLC— Mebane, NC ASU
1.0 INTRODUCTION
General:
Airgas USA, LLC, an Air Liquide Company, is currently constructing an Air Separate Unit (ASU) plant
facility (SIC 2813,NAICS 325120) along with a product delivery truck terminal and maintenance shop in
11.68 acres of the property in the North Carolina Industrial Center located in Mebane, Alamance County,
North Carolina(NC).
The facility will use the atmospheric air as the raw material and produce liquid Nitrogen, liquid Oxygen
and liquid Argon via physical separation processes and distribute the products to customers in the region
via tank trucks.
Administrative Information:
Project Contact: Eric Alvarenga
Project Manager
[phone]
Eric.al varenga@ai rl i q u i d e.con
Site Mailing Address: 314 Lake Latham Road,
Mebane, North Carolina 27302
Site Location Address: 2025 Development Center Drive
Mebane,North Carolina 27302
Domestic and Industrial Wastewater Generation
The proposed ASU plant facility's operations will generate both domestic and industrial wastewater
streams. In accordance with the underground utilities design, there will be two separate sewer lines that
discharge from the proposed ASU plant facility:(1)domestic sewer line and(2)industrial wastewater sewer
line. The domestic wastewater(approximately 540 gallons per day(GPD)based on 30 GPD per employee
and a total of 18 employees)will be discharged by gravity, while all the industrial wastewater streams will
be collected in a pump station first and pumped into a downstream manhole. The domestic and industrial
wastewater streams will be combined in the downstream manhole and the combined wastewater will flow
from the manhole into the public sewer by gravity. An average industrial wastewater flow is approximately
46,000 GPD.
Discharge to the POTW:
All the wastewater from the proposed facility will be discharged into the City of Mebane Publicly-Owned
Treatment Works(POTW).
The City of Mebane Industrial User Wastewater Survey and Permit Application was submitted to and
reviewed by the City of Mebane POTW. It has been determined that an Industrial User Permit is not
required for the proposed facility to discharge industrial wastewater into the City of Mebane's POTW.
Objective of this Pump Station Design Narrative
This pump station design narrative("Narrative")is prepared to summarize key elements in the pump station
design in an effort to help speed up the pump station and force main permitting process. The Narrative
only includes relevant key process design information.
Narrative- 6 August 2019

Airgas USA, LLC—Mebane, NC ASU
Permit Application for the Pump Station
2.0 REVIEW OF THE APPLICABLE REGULATIONS AND DESIGN CRITERIA AND THE
PERMITTING PROCESS FOR PUMP STATIONS AND FORCE MAINS
In accordance with 15A NCAC 02T .0300, a pump station and force main with equal to or more than 600
GPD of flow is subject to the North Carolina Department of Environmental and Natural Resources
(NCDENR)pump station and force main permitting. The design criteria specified in 15A NCAC 02T.0305
will need to be met.
NCDENR has provided the Minimum Design Criteria (MDC) for the Permitting of Pump Stations and
Force Mains that can be followed and used by applicants who will prepare the fast track sewer system
extension application and submit it to the North Carolina Department of Environmental Quality (NCDEQ)
Division of Water Resources (DWR). The Minimum Design Criteria has been adopted by the DWR.
The pump station and force main design follows the requirements in 15A NCAC 02T.0305 and the MDC
for the Permitting of Pump Stations and Fore Mains. Airgas submits the Fast Track Sewer System
Extension Application to the permitting authority.
3.0 INDUSTRIAL WASTEWATER STREAMS AND FLOWS ESTIMATE
Again,an average industrial wastewater flow is approximately 46,000 GPD. A breakdown of the industrial
wastewater flows is presented below.
Table I
Industrial Wastewater Streams and Flow Estimates
Industrial Wastewater Stream Flow Estimate GPD
Cooling tower blowdown 39,000
Side stream filter backwash water 3,000
Miscellaneous use—eye wash, emergency shower, etc Negligible
Compressors condensate 3,000
Washdown/drains from truck shop/compressor build in 300
Stormwater from the truck scale area 396
Total Estimated 45,696
Effect of Power Outaize on the Industrial Wastewater Generation:
The energy source for the ASU plant operation is electricity. All components of the production equipment
unit are electrically operated. In the event that there is a power outage at the ASU plant, the ASU plant
operations simply stop and consequently, no industrial wastewater will be generated from the production
operations and flow into the pump station. It is reviewed below how each industrial wastewater stream
generation will be affected by a power outage.
1. Cooling tower blowdown: All cooling tower recirculation pumps will stop, there will not be
evaporation from the cooling tower,solenoid valves will not open, and consequently,there will not
be any blowdown from the cooling tower.
2. Side stream filter backwash water: Filter backwashing will occur once a day. The backflow pumps
that require electrical power will not be in operation and there will not be any filter backwash water
during power outage.
Narrative - 7 August 2019

Airgas USA, LLC—Mebane, NC ASU
Permit Application for the Pump Station
3. Miscellaneous use—eve wash emergency shower,etc: During a power outage, it is not anticipated
that there will be eye washing and emergency shower.
4. Compressors condensate: There will not be any air intake,air compressors will not be in operation,
and consequently no condensates will be generated.
5. Washdown / drains from truck Shop / compressor building? Washdown activities are not
electrically driven. There will be a procedure to be established for all employees for no Washdown
during power outage.
6. Stormwater from the truck scale area: Stormwater to be collected in the truck scale area is to be
pumped. Because of no power during power outage,the pump will not work to pump the collected
rain water into the pump station.
Thus, when there is a power outage at the ASU plant,there will not be industrial wastewater and rainwater
that will flow into the pump station and therefore, there will be no industrial wastewater that will need to
be pumped out of the pump station.
4.0 DESIGN BASIS FOR PUMPS, PUMP STATION AND FORCE MAIN
Due to the elevation differences between the industrial wastewater generation sources and the public sewer
identified during the design of the underground utilities for the facility, the gravity sewer is infeasible and
therefore, the industrial wastewater streams will need to be collected and pumped into the public sewer.
Thus, the objective of the pump station is to hydraulically convey the collected industrial wastewater
streams into the public sewer line. The working capacity of the pump station is determined to accommodate
two key factors below.
(1) The City of Mebane's flow requirement(s) from the pump station into the public sewer; and
(2) Industrial wastewater flowing into the pump station.
The City of Mebane has limited the pump station discharge flow to 100 gallons per minutes (GPM). The
pump station will need to be able to handle the flow rates, frequencies and durations of all the industrial
wastewater streams. Industrial wastewater flow rates, frequencies and durations are summarized below.
Table 2
Industrial Wastewater Flows and Generation Frequency and Duration
Approximate Wastewater Instantaneous Generation
Industrial Wastewater Stream Flow(GPD) Generation Flow Rate Duration
Frequency (GPM) Minutes
Cooling tower blowdownto 39,000 Multiple App. 100 or Likely up to
times a day higher 60
Side stream filter backwash 3,000 Once a day App. 1,000 App. 3
water
Miscellaneous use—eye wash, Negligible Very
emergency shower, etc infrequently
Compressors condensate(" 3,000 Continuous] App. 2 Continuous]
Washdown/drains from Truck 300 Once a day App. 5 App. 60
Shop/Compressor Buildin tzt minutes
Narrative- 8 August 2019

Airgas USA, LLC—Mebane, NCASU
Permit Application far the Pump Station
Stormwater from Truck Scale t't396 When it rains App. 20 Continuously
Area(2),(3), during the
rain event
Total Estimated 45,696
Notes:
(1) The cooling tower blowdown will not occur when the side stream filter backwashing occurs and the backwash
water is pumped out of the pump station.
(2) These flows will be treated with and/or flow through the oil/water separator prior to entering the pump station.
(3) The runoff from the truck scale area is collected in a sump located in the truck scale area and pumped into
the oil/water separator and then flow into the pump station. The pumping rate is limited to 20 GPM by
design.
(4) An average runoff flow from the truck scale area is estimated based on the annual rainfall of 45 inches and
the drainage area of 5,152 ft'.
5.0 PUMP DESIGN
In accordance with the City of Mebane's requirements,the pump will be sized and selected to pump at less
than 100 GPM of flow out of the pump station and convey through the pipeline between the pump station
and the downstream manhole. The number and capacity of each pump is as follows:
No. of pumps: 2 submersible pumps(one standby)
Pumping capacity: 80 GPM(Nominal); 100 GPM (Maximum)each
Each pump will handle the flow rate of 80 GPM at the pipe length of 281 feet (between the pump station
and the downstream manhole) and the lift head in the pump station elevation. Also, each pump will
maintain the required minimum velocity of 2 ft/sec in the pipeline. The force main pipe diameter is selected
at 4 inches which provides 2.04 ft/sec at the flow rate of 80 GPM. The Total Dynamic Head is calculated
to be approximately 13 ft.
An average estimated pump run time per day is approximately 575 minutes(an average daily flow of46,000
GPD divided by the pumping rate of 80 GPM), equivalent to approximately 9.6 hours. In general, the run
time will likely be less in winter than in summer due to the cooling tower blowdown flow changes. Also,
there will be higher run time during a rain event.
6.0 PUMP STATION DESIGN
As presented in Section 4.0, the side stream filter backwash water is generated at the flow rate of 1,000
GPM for 3 minutes and is the dominant flow for a short period among the industrial wastewater streams.
The pump station will need to be able to accommodate the instantaneous flows that it receives at the
discharge pumping rate of 80 GPM. The pump station is sized to hold the entire side stream filter backwash
water and key design parameters are presented in Table 3:
Table 3
Summary of Key Pump Station Design Items
Equipment/Elements Design Notes
No. of pump station 1
Working capacity Approximately 3,250 gallons
Narrative- 9 August 2019

Airgas USA, LLC—Mebane, NCASU
Permit Applica/ion for the Pump Station
Total capacity Approximately 4,500 gallons
Dimensions Approximately 13'(L) x 5.5'(W) x 8.5'(H)
Maximum working height Approximately 7.5 feet
Pump stop, start and alarm floats Shown in the drawings
Control panel Control panel that meets the minimum design criteria
Construction materials Concrete
—Standby power source(') Standby power generator with telemetry
Note:
(1) It is anticipated that a standby power source is not needed for the pump station design because there will not
be industrial wastewater streams flowing into the pump station for the reasons stated in Section 3.0. In
accordance with an NCDEQ DWR representative consulted during the pump station design, a waiver is
possible;however, due to project time constraints,the project team has decided to provide a standby power
source with automatic activation and telemetry for the permitting purpose.
Site selection,structural design,piping and valves and appurtenances will be shown in the design drawings.
7.0 FORCE MAIN DESIGN
The force main pipe length is approximately 281 feet between the pump station and the downstream
manhole. Other design information is summarized below.
• Material: PVC
• Diameter: 4 inches
• Velocity: 2.04 ft/sec based on the flow of 80 GPM and a 4-inch diameter
• Surge and water hammer will be shown in design drawings if applicable.
• Appurtenances will be shown in design drawings if applicable.
• Installation will be shown in design drawings.
8.0 OPERATION AND MAINTENANCE
In accordance with the Operations and Maintenance(O&M)Manual requirements in the Minimum Design
Criteria for the Permitting of Pump Stations and Force Mains (Section 6.01), an O&M Manual will be
prepared for the proposed pump station and force main and kept in the office of the ASU plant facility. It
is anticipated that at a minimum, the following will be included:
I. Approved shop drawings, including design data for all installed equipment and each major
component and a pump curve/system curve analysis showing the design operating point(s).
2. Control panel wiring diagrams.
3. Warranty information for all installed equipment and each major component.
4. Inventory, functional descriptions, and complete operating instructions for all installed equipment
and each major component.
5. Instructions for start-up/shut-down as well as for calibration and adjustment of all installed
equipment and each major component.
6. Recommended maintenance management system, including preventative and predictive
maintenance, for all installed equipment and each major component.
7. Contingency plan and analysis of critical safety issues.
Narralive - 10 August 2019

Airgas USA, LLC—Mebane, NCASU
Permit Application for the Pump Station
8. Contact information for local service companies as well as instructions for replacement of all
installed equipment and each major component.
9. Contact information for local contractors capable of performing emergency repairs.
10. Contact information for regulatory and other agencies.
9.0 PROFESSIONAL ENGINEER'S CERTIFICATION
The Narrative above has been reviewed by me and is accurate,complete and consistent with the engineering
design of the pump station and force main to the best of my knowledge. Any changes to the engineering
design drawings will be reflected in the construction record drawings.
Signed by: Seal:
Name: Gaby E. Iskandar, P.E. ,PSN\i16AR011 i,
�P.�g9 S%O•�Z
License Number: 046349 ��;b y•,v
:a SEAL r:
049349
Signature: V. i4/E.l'SKP�ss�
10
Date: 8/7/2019
Narrative - 11 August 2019