AQ_F_1800365_20210714_CMPL_InspRpt

NORTH CAROLINA DIVISION OF Mooresville Regional Office
AIR QUALITY Corning Optical Communications,LLC-HMTC
NC Facility ID 1800365
Inspection Report County/FIPS:Catawba/035
Date: 07/14/2021
Facility Data Permit Data
Corning Optical Communications,LLC-HMTC Permit 06409/R20
1164 A 23rd Street SE Issued 2/2/2018
Hickory,NC 28602 Expires 1/31/2026
Lat: 35d 42.7074m Long: 8ld 17.5590m Class/Status Small
SIC: 3357/Nonferrous Wire Drawing/Insulating Permit Status Active
NAILS: 335921 /Fiber Optic Cable Manufacturing Current Permit Application(s)None
Contact Data Program Applicability
Facility Contact Authorized Contact Technical Contact SIP
Steve Street Ahmed Koilakh Steve Street
Senior EHS Coordinator Plant Manager Senior EHS Coordinator
[phone] [phone] [phone]
Compliance Data
Comments:
Inspection Date 07/14/2021
Inspector's Name Donna Cook
Inspector's Signature: `904um eaak VM Operating Status Operating
Compliance Status Compliance-inspection
Action Code FCE
Date of Signature: C711512C21 Inspection Result Compliance
Total Actual emissions in TONS/YEAR:
TSP S02 NOX VOC CO PM10 *HAP
2016 1.23 --- --- 33.17 --- 1.23 804.50
2012 --- --- --- 30.60 --- --- 1693.05
*Highest HAP Emitted inpounds)
Five Year Violation History:None
Date Letter Type Rule Violated Violation Resolution Date
Performed Stack Tests since last FCE:None
Date Test Results Test Method(s) Source(s)Tested

Corning Optical Communications,LLC—HMTC
July 14,2021
Page 2
Type Action: X Full Compliance _Partial Compliance _Complaint Other:
Evaluation Evaluation/Reinspection Investigation
Data Tracking: X Date submitted for initial review 07/15/2021 _IBEAM WARNING/OB,NOD,NOV,NRE
X IBEAM Document
X IBEAM Inspection,list date inspected X IBEAM LAT/LONG,Facility Locked
X IBEAM Inspection,list date draft is submitted X IBEAM LAT/LONG,Coordinates checked
X IBEAM Inspection,pollutants/programs checked _IBEAM Complaint
X IBEAM Planning,Next Inspection Date 07/01/2023
Directions: From Mooresville Regional Office to Hickory,travel via Statesville Avenue;North Broad
Street and the name changes to Statesville Highway(Highway 115 North)and then to Charlotte Highway
(Highway 21 North and Highway 115 North); Interstate 77 North; Exit 5 1-Interstate 40 West toward
Asheville; off Interstate 40 West take Exit 126-US 70/Hickory/Newton;turn right off exit ramp onto
McDonald Parkway SE; and then immediately take the next street to the right onto 23rd Street SE. The
driveway for Corning Optical Communications,LLC—HMTC is located on the left. The street address of
this company is 1164 23'Street SE. It is recommended that the facility contact be phoned prior to leaving
the office due to the security entry procedures.
Safety Equipment: The inspector will have to show a driver license at the security entrance in order to
gain access to this facility. The inspector will not be allowed to wear lanyards.No photography,recording
devices, or cell phones are allowed in the facility. This company requires that the inspector wear steel-
toed shoes, safety glasses, safety vest, and hearing protection at this facility.
A face covering is required to be worn by all employees and visitors at this facility due to the ongoing
coronavirus pandemic. I wore a face covering during the on-site inspection of this facility.
Safety Issues: The inspector should be cautious of forklifts at this facility. The facility requires all
employees and visitors to wear face coverings due to the ongoing coronavirus pandemic. I also completed
a health questionnaire as required by this company prior to entering this facility.
Lat/Long Coordinates: A review of the "Facilities Regulated by Air Quality" on the DAQ web site
indicates the facility's location is accurate and matches the facility's latitude and longitude coordinates
listed in IBEAM. No changes to the latitude and longitude coordinates of this facility are needed in
IBEAM. The latitude and longitude coordinates of this facility are locked in IBEAM.
Email Contacts: The emails for the facility, authorized,technical, and invoice contacts were verified by
Mr. Steve Street, senior environmental health and safety(ehs) coordinator. I changed the email address of
Mr. Street in IBEAM.
1. General Information:
The purpose of this site visit was to conduct a routine air quality inspection. This facility
manufactures indoor and outdoor fiber optic cable for the telecommunication industry. This
company operates this facility 24 hours per day, 7 days per week, 52 weeks per year. Mr. Steve
Street, senior environmental health and safety (ehs) coordinator, and Mr. Dalton Kaylor,
environmental and safety(ehs)technician, accompanied me during this inspection.

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July 14,2021
Page 3
2. Facility Contact Information:
During the inspection, I verified the facility contact information in IBEAM with Mr. Street. No
changes are needed in IBEAM.
3. Compliance history file review:
No problems have been noted in the last five years by DAQ prior to this inspection. The current
compliance status is discussed in the following sections.
4. Observations of permitted air emission sources and control devices:
Emission Emission Source Control Control System
Source ID Description FSystem ID Description
P101,P102,P103,P104, painting process 1 consisting
P 105,P 106,P 107,P 108, of seventy-two(72)painting
P 109,P 110,P 111,P 112, lines (ID Nos. P 101 through
P113,P114,P115,P116, P172)
P 117,P 118,P 119,P 120,
P121,P122,P123,P124,
P125,P126,P127,P128,
P129,P130,P131,P132,
P133,P134,P135,P136, N/A N/A
P137,P138,P139,PI40,
P141,P142,P143,P144,
P 145,P 146,P 147,P I48,
P149,P150,P151,PI52,
P153,P154,P155,P156,
P157,P158,P159,P160,
P 161,P 162,P 163,P 164,
P 165,P 166,P 167,P 168,
P169,P170,P171,P172
The compliant coatings are applied in the painting process 1. The routine cleaning applications are
also conducted on the painting process 1. Any emissions from isopropyl alcohol(IPA)and
acetone are fugitive. However,the emission sources on the painting process I have fume hoods
that are located above the emission sources and exhaust outside of this facility.
Observed.The compliant coatings and cleaning applications were operational at the time of the
inspection. I observed that the emission sources on the painting process 1 were less than the 72
permitted painting lines.No visible emissions were observed by me from the painting process 1.
No odors were detected by me from the painting process 1.
P301,P302,P303,P304, painting process 3 consisting
P305,P306,P307,P308, of eighteen(18)painting
P309,P310,P311,P312, lines (ID Nos. P301 through N/A N/A
P313,P314,P315,P316, P318)
P317,P318
The compliant coatings are applied in the painting process 3. The maintenance cleaning and repair
applications are also conducted on the painting process 3.Any emissions from isopropyl alcohol

Corning Optical Communications,LLC-HMTC
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Page 4
(IPA),acetone, and methyl ethyl ketone(MEK) are fugitive. However,the emission sources on
painting process 3 have fume hoods that are located above the emission sources and then exhaust
outside of this facility.
Observed.The compliant coatings and cleaning applications were operational at the time of the
inspection. I observed that the emission sources on the painting process 3 were less than the 18
permitted painting lines.No visible emissions were observed by me from the painting process 3.
No odors were detected by me from painting process 3.
P0322,P0323,P0324, painting process 4 consisting
P0325,P0326,P0327, of twenty(20)painting lines
P0328,P0329,P0330, (ID Nos. 0322 through
P0331,P0332,P0333, P0341) N/A N/A
P0334,P0335,P0336,
P0337,P0338,P0339,
P0340,P0341
The compliant coatings are applied in the painting process 4. The maintenance cleaning
applications are also conducted on the painting process 4. Any emissions from isopropyl alcohol
(IPA),acetone,methyl ethyl ketone(MEK) and methyl isobutyl ketone(MIBK) are fugitive.
However,the emission sources on painting process 4 exhaust to a filter system(manufacturer,
Neuderman)located inside of this facility and then it exhausts outside of this facility.
Observed.The compliant coatings and cleaning applications were operational at the time of the
inspection. I observed that the emission sources on the painting process 4 were less than the 20
permitted painting lines.No visible emissions were observed by me from the painting process 4.
No odors were detected by me from painting process 4.
P701,P702,P703,P704, painting process 7
P705,P706,P707,P708, consisting of forty(40)
P709,P710,P711,P712, painting lines(ID Nos. P701
P713,P714,P715,P716, through P740)
P717,P718,P719,P720, N/A N/A
P721,P722,P723,P724,
P725,P726,P727,P728,
P729,P730,P731,P732
P733,P734,P735,P736
P737,P738,P739,P740
The compliant coatings are applied in the painting process 7. The maintenance cleaning
applications are also conducted on the painting process 7. Any emissions from methyl ethyl
ketone (MEK)are fugitive. However,the emission sources on painting process 7 have fume
hoods that are located above the emissions and exhaust outside of this facility.
Observed. The compliant coatings and cleaning applications were operational at the time of the
inspection. I observed that the emission sources on the painting process 7 were less than the 40
permitted painting lines. No visible emissions were observed by me from the painting process 7.
No odors were detected by me from painting process 7.
PMO1,PM02,PM03,PM04, Ten(10) spare printers
PM05,PM06,PM07,PM08, N/A N/A
PM09,PM 10

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Mr. Street stated that the ten spare printers will minimize downtime on the paint processing lines.
The ten inkjet printers will replace the operating printers on the painting process lines 3 and 7 if
maintenance is needed on them. The inkjet printers are located in the northwest corner of the
manufacturing plant. Any emissions from the cycling of methyl ethyl ketone(MEK)through the
ten inkjet printers are fugitive.
Observed.No spare inkjet printers were observed in the northwest corner of the manufacturing
plant at the time of the inspection.
C 101, C 102, C 103, C 104, cleaning process 1 consisting
C 105 of five(5)cleaning lines (ID N/A N/A
Nos. C101 through C105)
The maintenance cleaning applications for the curing dyes are conducted in the cleaning process
1.Any emissions from isopropyl alcohol(IPA)in bottles and mainly acetone in bath are fugitive.
However,one cleaning line and a manual station in the cleaning process 1 have fume hoods that
exhaust outside of this facility.
Observed.The cleaning applications were operational at the time of the inspection. I observed
that the emission sources on the cleaning process 1 were less than the five permitted cleaning
lines.No visible emissions were observed by me from the cleaning process 1.No odors were
detected by me from cleaning process 1.
C601, C602, C603 cleaning process 2 consisting
of three(3) cleaning lines N/A N/A
(ID Nos. C601 through
C603)
The repair cleaning applications in extrusion area are conducted in the cleaning process 2. Any
emissions from isopropyl alcohol(IPA) and methyl ethyl ketone(MEK) are fugitive. However,
two cleaning lines in the cleaning process 2 have fume hoods that exhaust outside of this facility.
Observed.The cleaning applications were operational at the time of the inspection. I observed
that the emission sources on the cleaning process 2 were less than the three permitted cleaning
lines.No visible emissions were observed by me from the cleaning process 2.No odors were
detected by me from cleaning process 2.
C301, C302, C303, C304 cleaning process 3 consisting
of four(4)cleaning lines(ID N/A N/A
Nos. C301 through C304
The cleaning applications for extrusion tooling are conducted in the cleaning process 3.Any
emissions from these operations are hydrocarbons,nitrogen oxide(NOx) and particulate matter.
The particulate emissions are captured by two cyclones that are installed on two electric ovens
and two baths. Each stack of the two cyclones is manifolded and exhaust outside of this facility.
This office received a letter dated November 7,2018 from this company stating that a small
amount of hydrochloric acid(HCL)would be used on all lines of the cleaning process 3. The
cleaning of HCL was not considered a permit modification and did not trigger air toxics. During
the inspection,Mr. Street indicated that HCL was no longer being used on all lines of the cleaning
process 3.
Observed.The cleaning applications were operational at the time of the inspection. I observed

Corning Optical Communications,LLC-HMTC
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that the emission sources on the cleaning process 3 were less than the four permitted cleaning
lines.No visible emissions were observed by me from emission sources or two cyclones on the
cleaning process 3.No odors were detected by me from cleaning process 3.
rC44O1, C402, C403,C404, cleaning process 4 consisting
05, C406 of six(6) cleaning lines(ID N/A N/A
Nos. C401 through C406)
The cleaning and maintenance applications involve the use of parts washer(manufacturer,ZEP).
Any volatile organic compounds(VOC)emissions from the parts washer is fugitive.
Observed.The cleaning and maintenance applications using the parts washer were not in use at
the time of the inspection. I observed that the cleaning lines on cleaning process 4 were less than
the six permitted cleaning lines.No visible emissions were observed by me from the parts washer.
No odors were detected by me from the parts washer.
E101,E102,E103,E104, extrusion process 1
E105,E106,E107,E108, consisting often(10) N/A N/A
E109,E110 extrusion lines (ID Nos.
E 101 through El 10)
The extrusion of plastics materials is conducted in extrusion process 1. The volatile organic
compound(VOC)emissions are emitted from the extrusion process 1. The cleaning with
isopropyl alcohol(IPA)is conducted in the extrusion area. The extruders on extrusion process 1
vent to the outdoor atmosphere.No cleaning is conducted in the extrusion area.
Observed.The extrusion process 1 and cleaning applications were operational at the time of the
inspection. I observed that the emission sources on extrusion process I were less than the ten
permitted extrusion lines.No visible emissions were observed by me from extrusion process 1 or
the cleaning applications.No odors were detected by me from extrusion process 1 or the cleaning
applications.
E201,E202,E203,E204, extrusion process 2
E205,E206,E207,E208, consisting of forty(40)
E209,E210,E211,E212, extrusion lines (ID Nos.
E213,E214,E215,E216, E201 through E240)
E217,E218,E219,E220, N/A N/A
E221,E222,E223,E224,
E225,E226,E227,E228,
E229,E230,E231,E232,
E233,E234,E235,E236,
E237,E238,E239,E240
The extrusion of plastics materials is conducted in extrusion process 2. The volatile organic
compound(VOC)emissions are emitted from the extrusion process 2. The extruders on extrusion
process 2 vent outside of this facility.No cleaning is conducted in the extrusion area.
Observed.The extrusion process 2 was operational at the time of the inspection. I observed that
the emission sources on extrusion process 2 were less than the 40 permitted extrusion lines.No
visible emissions were observed by me from extrusion process 2.No odors were detected by me
from extrusion process 2.
F
E302,E303,E304 extrusion process 3 N/A N/A
E306,E307,E308, consisting of twelve(12)

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E309,E310,E311,E312 extrusion lines (ID Nos.
E301 through E312)
Mr. Street stated that extrusion process 3 has been moved from this facility and installed at
another Corning facility.
Observed.The extrusion process 3 is no longer at this facility. Mr. Street stated that the
extrusion process 3 consisting of twelve(12)extrusion lines (ID Nos. E301 and E312) should
remain on the current air permit for future growth.
E401,E402,E403,E404, extrusion process 4
E405,E406,E407,E408, consisting of ten(10)
E409,E410 extrusion lines (ID Nos. N/A N/A
E401 through E410)
The extrusion of plastics materials is conducted in extrusion process 4. The volatile organic
compound(VOC)emissions are emitted from the extrusion process 4.The extruders on extrusion
process 4 vent outside of this facility.No cleaning is conducted in the extrusion area. There is
laser etching of text statements into the polyethylene fiber optic cable on the lines in extrusion
process 4. Any emissions from the laser etching is captured by a HEPA filter and a carbon filter.
This office received a letter dated August 9,2019 from this company regarding the laser
etching process.MRO DAQ permitting sent an email dated August 21, 2019 exempting the laser
etching process per 2Q .0102 (h)(5).
Observed.The extrusion process 4 was operational at the time of the inspection. I observed that
the emission sources on extrusion process 4 were less than the ten permitted extrusion lines.No
visible emissions were observed by me from extrusion process 4.No odors were detected by me
from extrusion process 4.
MESD Imetal machining I N/A I N/A
The machines lathe metal tools using oil and water-based coolants inside the machine shop of
MESD. All of the metal machining sources use volatile organic compounds(VOC)containing
materials for the purposes such as cutting,cleaning and lubrication. The metal machining
operations do not exhaust outside of this facility.
Observed.The metal machining of tools was being conducted at the time of the inspection. I
observed no visible emissions or detected any odors from the metal machining operations.
AU ammonia usage I N/A F N/A
Mr. Street stated that ammonia is not being used for production at this facility. However,
ammonia is used in the technology research and development labs at this facility. It was estimated
by Mr. Street that the ammonia usage was less than five gallons per year.
Observed.No ammonia use was observed by me at the time of the inspection.
PSB1 dry filter-type spray booth N/A N/A
The spray booth equipped with dry filters was installed in August 2015. The spray booth is
located in the former battery room of this facility.No manufacturing process is occurring in the
spray booth. This company uses aerosol spray cans in the booth to apply touch-up paint to the
maintenance work carts and stands used in the production area of this facility. The spray booth
exhausts through the roof to the outside of this facility. The stack of the spray booth is vertical.
When the spray booth fan is turned off,then the damper closes inside the spray booth stack.

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Observed.No painting using aerosol cans was being conducted at the time of the inspection.
The dry filters were in place in the booth at the time of the inspection.
PW parts washer I N/A I N/A
The Cuda model electrically heated parts washer is located in the machine shop of this facility.
The parts washer contained detergent(6.3%VOC/glycol ether)that is used to clean oil out of the
metal filters from the two smog hogs(electrostatic precipitators)installed on the four oil
evaporation lines(ID No. ISH). The parts washer is currently not vented outside of this facility.
Observed.The Cuda model electrically heated parts washer was not operational at the time of
the inspection.No visible emissions were observed or any odors detected by me from the parts
washer at the time of the inspection.
5. Observations of insignificant air emission sources and control devices listed on the current permit:
Source Exemption Source of Source of Title V
Regulation TAPs? Pollutants?
IC501 —QA and technology lab r(gQ)
0102 Yes Yes
(3)(B)
The material evaluation processes are conducted in QA lab for new incoming raw materials and
technology labs for potential raw materials.Acetone,toluene, chloroform, IPA and MEK are used
in the material evaluation processes.Various fume hoods and muffle furnaces are used to vent any
emissions generated from the lab processes outside of this facility.
Observed.The material evaluation processes were operational in the QA and technology labs at
the time of the inspection. I observed no visible emissions or detected any odors from the QA and
technology labs.
F
504 -cleaning process r(9Q
.0102 Yes Yes
)(3)(B) F
This process uses one EDM to place holes in metal. This process exhausts through a hood to the
outside atmosphere.
Observed.The EDM machine was in operation at the time of the inspection. I observed no visible
emissions or detected any odors from the EDM machine.
IMPDE -five(5)MPDE storage silos 12Q .0102 (h)(5) F No Yes
The five MDPE silos are located outside of this facility. The five MDPE silos are used to store
plastic materials. A vacuum system is used to unload the plastic materials from the tanker trucks
into the five MPDE silos.
The description should be changed to IMDPE—five(5)MDPE storage silos as indicated by
Mr. Street during the next permit revision.
Observed.No tanker truck unloading of plastic materials into the five MDPE silos was occurring
at the time of the inspection. The five MDPE storage silos were in use with no visible emissions
observed or odors detected by me at the time of the inspection.

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IFR-flexible resin vacuum system [2Q .0102 (h)(5) No Yes
venting to a fabric filter
The flexible resin vacuum systems are used to transport the plastic compounding materials to the
electric drying operations (ID No. I-DRY) and then to the extruders. The various filter systems
are used to capture particulate matter emissions from the flexible resin vacuum systems. The filter
systems do not exhaust outside of this facility. Since there are more than one particulate filter
system associated with flexible resin vacuum systems,then the description should be
changed to flexible resin vacuum systems venting to filter systems during the next permit
revision.This process is also discussed in the electric drying operations(ID No. I-DRY).
Observed.The flexible resin vacuum systems with associated filter systems were operational. I
observed no visible emissions or detected any odors from these sources at the time of the
inspection.
IAC -industrial air cleaners 12Q .0102 (h)(5) F Yes Yes
The six industrial air cleaners had been used to attract and capture any fugitive oily mist from the
cutting oils used in the metal machining operations(ID No. MESD). Mr. Street stated that the six
industrial air cleaners have been removed from this facility.
Observed.The six industrial air cleaners are no longer at this facility.
IVH-vent hood 2Q .0102 (h)(5) Yes Yes
Observed. Mr. Street stated that the vent hood in the clean room has never been installed at this
facility.
ISH-four(4)oil evaporation lines F2Q .0102 (h)(5) No Yes
each venting to smog hogs
The four process lines are used to evaporate oil off of products on the bx lines. The four oil
evaporation lines vent to two smog hogs (electrostatic precipitators). Each smog hogs has a
separate exhaust outside of this facility. Mr. Street indicated that only one smog hog is in service
at a time.
Observed. Only one smog hog installed on the oil evaporation lines was in operation. I observed
no visible emissions from the four oil evaporation lines or the two smog hogs (electrostatic
precipitators) at the time of the inspection.
IE619-research/saleable product 2Q .0102 (h)(5) No Yes
extrusion line
The extrusion line 619 is used for technology research and development of outdoor cable
products. The extrusion line 619 exhausts outside of this facility. The inkjet printing is also
occurring on the extrusion line 619. The extrusion line 619 and extrusion lines 975-1 and 975-2
share the same inkjet printer. There was not inkjet printer installed on the extrusion line 619 or
extrusion lines 975-1 and 975-2 during the inspection.
Observed.The extrusion line 619 was not in operation at the time of the inspection.
IE975 -research/saleable product [2Q .0102 (h)(5) No Yes
extrusion line
The extrusion lines 975-1 and 975-2 are used for technology research and development of outdoor
cable products. The extrusion lines 975-1 and 975-2 exhaust outside of this facility. The inkjet

Corning Optical Communications,LLC—HMTC
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printing is also occurring on the extrusion lines 975-1 and 975-2. The extrusion lines 975-1 and
975-2 and extrusion line 619 share the same inkjet printer. There was not inkjet printer installed
on the extrusion lines 975-1 and 975-2 or extrusion line 619 during the inspection.
Observed.The extrusion lines 975-1 and 975-2 were not in operation at the time of the
inspection.
F
O-soldering operation r(9Q)
.0102 No No
(14)(B)
The MESD operations use solder for extrusion tooling equipment. Any emissions from this
process is fugitive inside of the machine shop.
Observed.No soldering operations were observed by me at the time of the inspection.
I-DRY-electric in o erations r(gQ)
.0102 No No
Yg p (14)(B)
The plastic compounding materials are transported by the flexible resin vacuum systems to the
electric drying operations (ID No. I-DRY) and then to the extruders. The electric drying
operations(ID No. I-DRY) are comprised of ten electric dryers in the manufacturing area and
nine electric dryers in an enclosed room of this facility. The dryers vent outside of this facility to
remove heat from the drying process and to provide employee comfort. This process is also
described in the IFR-flexible resin vacuum system venting to filter systems.
Observed.The electric drying operations(ID No. I-DRY; 19 electric dryers)were operational. I
observed no visible emissions or detected any odors at the time of the inspection.
I-QTCP -quartz tube cleaning process 2Q .0102 (h)(5) I No F No
The quartz tubes are cleaned in this process by using heat from two electric ovens to remove any
residue from them. The two electric ovens exhaust outside of this facility through one stack.
Observed.The quartz tube cleaning process was in operation at the time of the inspection. I
observed no visible emissions or detected any odors form the quartz tube cleaning process.
6. Observations of air emission sources and control devices not listed on the current permit:
a. This company has various cartridge filter systems installed on extrusion processes that do
not exhaust outside of this facility. The filter systems are exempt per 15A NCAC 2D
.0102 (g)(14)(J)-equipment not vented to the outdoor atmosphere and not listed as exempt
sources per DAQ policy.
b. This company has natural gas-fired furnaces that are used to provide comfort heat to the
employees in the warehouse and manufacturing areas of this facility. The natural gas-fired
furnaces are exempt per 15A NCAC 2Q .0102 (g)(5)(A) and not listed as exempt sources
per DAQ policy.
C. This company has a laser etching process that exhausts to a HEPA filter in the MESD area
of this facility. The HEPA filter is located under the laser etching process on the floor and
exhausts inside of the machine shop room. The laser etching process and HEPA filter were
not in operation at the time of the inspection. The laser etching process is exempt per 15A

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NCAC 2D .0102 (g)(14)(J)-equipment not vented to outdoor atmosphere and not listed per
DAQ policy.
d. This company has one carbon dioxide and one nitrogen storage tanks. The storage tanks
are exempt from permitting per 15A NCAC 2Q .0102 (g)(14)(A) and not listed as exempt
sources per DAQ policy.
e. Duke Energy has installed a natural gas-fired Caterpillar(CAT)model emergency
generator rated at 100 kilowatts for the purpose of providing power during electrical
outages to the information technology(i.t..) system at this facility in April 2019. The
owner and operator of the natural gas-fired emergency generator is Duke Energy.
Corning Optical Communications,LLC has no access or control over the operations of
the natural gas-fired emergency generator at its facility as indicated by Mr. Street. The
natural gas-fired emergency generator is exempt per 15A NCAC 2Q .0102 (h)(5).
f. The spot welding operations are conducted only for maintenance purposes at this facility.
The welding operations are not subject to 40 CFR Part 63 Subpart XXXXXX (6X),
NESHAP for Nine Fabrication and Finishing Area Source Categories, since the primary
SIC code 3357 (nonferrous wire drawing/insulating) and NAICS code 335921 (fiber
optic cable manufacturing) of this facility does not match the SIC or NAICS listed in the
NESHAP 6X rule.
7. Compliance with specific permit conditions and limitations:
a. Condition A. 2. Permit Renewal and Emission Inventory Requirement-The permittee at
least 90 days prior to the expiration date of this permit shall request permit renewal by
letter with an application form and submit the air pollution emission inventory report
with certification sheet for 2024 calendar year to MRO DAQ.
Observed.I informed Mr. Street that the air permit expires on January 31, 2026,and the
air pollution emission inventory report with certification sheet for 2024 calendar year and
application form must be submitted with the permit renewal request. I advised Mr. Street
to contact Jennifer Womick or Denise Hayes if there are any questions regarding air
quality permitting. Compliance with this stipulation is indicated.
b. Condition A. 3. Particulate Control Requirement-As required by 15A NCAC 2D .0515
"Particulates from Miscellaneous Industrial Processes,"particulate matter emissions from
dry filter-type spray booth(ID No. PSB1) shall not exceed allowable emission rates.
Observed.The dry filters are considered adequate control for capturing particulate matter
from the spray booth(ID No. PSB 1). The allowable emission rate from the dry filter type
spray booth(ID No. PSB1) is not being exceeded. Compliance with this stipulation was
indicated during the permit application process.
C. Condition A.4. Visible Emissions Control Requirement-As required by 15A NCAC 2D
.0521 "Control of Visible Emissions," visible emissions from the emission sources,
manufactured after July 1, 1971, shall not be more than 20 percent opacity when
averaged over a six-minute period.

Corning Optical Communications,LLC—HMTC
July 14,2021
Page 12
Observed.No visible emissions were observed by me from this facility. Compliance
with this stipulation is indicated.
d. Condition A. 5. Notification Requirement - As required by 15A NCAC 2D .0535, the
permittee of a source of excess emissions that last for more than four hours and that
results from a malfunction, a breakdown of process or control equipment or any other
abnormal conditions, shall notify the Director or his designee of any such occurrence by
9:00 a.m. Eastern time of the Division's next business day of becoming aware of the
occurrence.
Observed.Based on a conversation with Mr. Street,no excess emissions have occurred
at the facility. Compliance with this stipulation is indicated.
e. Condition A. 6. Fugitive Dust Control Requirement-As required by 15A NCAC 2D
.0540 "Particulates from Fugitive Dust Emissions Sources," the permittee shall not cause
or allow fugitive dust emissions to cause or contribute to the substantive complaints or
excess visible emissions beyond the property boundary. If substantive complaints or
excessive fugitive dust emissions from the facility are observed beyond the property
boundaries for six minutes in any one hour(using Reference Method 22 in 40 CFR,
Appendix A),the owner or operator may be required to submit a fugitive dust plan as
described in 2D .0540(f).
Observed. MRO DAQ has not received any fugitive dust emissions complaints regarding
this facility. This company has paved roads at this facility. During the inspection, I
observed no fugitive dust or visible emissions from this facility. Compliance with this
stipulation is indicated.
f. Condition A. 7. Toxic Air Pollutant Emissions Limitation Requirement-Pursuant to 15A
NCAC 2Q .0711 "Emission Rates Requiring a Permit" for each of the below listed toxic
air pollutants (TAPS),the permittee has made a demonstration that facility-wide actual
emissions,where one or more emission release points are obstructed or non-vertically
oriented, do not exceed the Toxic Permit Emission Rates(TPERs) listed in 15A NCAC
2Q .0711(a). The facility shall be operated and maintained in such a manner that emissions
of any listed TAPs from the facility, including fugitive emissions,will not exceed TPERs
listed in 15A NCAC 2Q .0711(a).
Chronic Acute Acute
Pollutant Carcinogens Toxicants Systemic Irritants
(lb/yr) (lb/day) Toxicants (lb/hr)
(lb/hr)
Acetic acid(64-19-7) _-F 0.96
Ammonia(as NH3) (7664-41-7) F 0.68
Benzene(71-43-2) 8.1 F__F_
Formaldehyde(50-00-0) -F-F-I 0.04
MEK(methyl ethyl ketone,2- 78 22.4
butanone) (78-93-3)
MIBK(methyl isobutyl ketone) 52 F-1 7.6

Corning Optical Communications,LLC—HMTC
July 14,2021
Page 13
Methyl chloroform(71-55-6) 250 64
Methylene chloride(75-09-2) 1600 0.39
Proethylene 13000 F
(tetrachetrachloroethylene)(127-18-4)
Phenol(108-95-2) F 0.24
Toluene(108-88-3) 98 14.4
Vinyl chloride(75-01-4) 26
Xylene(mixed isomers)(1330- 57 16.4
20-7)
Observed.The TPER limits of 2Q .0711(a)are applicable since the exhaust stacks are
mixed vertical/horizontal and capped/uncapped at this facility. According to the 2016
emissions inventory and air permit review for R20,this facility operated 8760 hours and
365 days and emitted 9049.22 lbs/yr, 24.79 lbs/day and 1.03 lbs/hr of MEK; 221.74
lbs/yr, 0.61 lbs/day and 0.025 lb/hr of MIBK; 4.80 lbs/yr, 0.013 lbs/day and 0.00055
lbs/hr of methyl chloroform; 47.90 lbs/yr; 0.13 lbs/day and 0.0055 lbs/hr of toluene; and
6.60 lbs/yr, 0.018 lbs/day and 0.00075 lbs/hr of xylene. All the pollutants listed in the
above TPER table were below the emission limits.
Mr. Street has a spreadsheet along with MSDS information and material usage to
calculate the actual emissions of the above referenced pollutants.A review of the
spreadsheet data from January 1, 2019 through May 31, 2021 indicated that methyl ethyl
ketone(MEK),methyl isobutyl ketone(MIRK),phenol(not emitted in January 2019),
toluene and xylene are the only pollutants emitted from this facility. The actual emissions
from these pollutants are less than the TPER limits listed in the above referenced table. A
copy of the monthly TAP report has been placed in the file of this facility. Compliance
with this stipulation is indicated.
8. NSPS/NESHAP Review:
The sources at this facility are not subject to NSPS.
This company is not subject to EPA rules, CFR Part 63, Subpart HHHHHH(6H),NESHAP:
Paint Stripping and Miscellaneous Surface Coating Operations at Area Sources and 40 CFR Part
63, Subpart MMMM(4M),NESHAP for Surface Coating of Miscellaneous Metal Parts and
Products.
EPA 6H rule only applies to spray application of coatings containing compounds of chromium
(Cr),lead(Pb),manganese(Mn),nickel(Ni), and cadmium(Cd), collectively referred to as the
target HAPs and chemical strippers that contain methylene chloride to removed dried paint from
wood,metal,plastic, and other substrates. The spray coating operation does not emit any of the
targeted HAPs and no paint stripping with any chemicals is used by this facility.
EPA 4M rule only applies to a facility that is a major source of RAPS. This facility does not emit
or have the potential to emit equal to or greater than 10 tons per year of any one HAP or 25 tons
per year of any combination of HAP.

Corning Optical Communications,LLC—HMTC
July 14,2021
Page 14
This company has no boilers, fire pump engines,peak shaving generators, or gasoline storage
tanks at this facility.
A natural gas-fired emergency generator rated at 100 kilowatts has been installed by Duke Energy
for the purpose of providing power during electrical outages to the information technology
system at this facility. The owner and operator of the natural gas-fired emergency generator is
Duke Energy. Corning Optical Communications,LLC has no access or control over the
operations of the natural gas-fired emergency generator at its facility as indicated by Mr. Street.
The spot welding operations are only for maintenance purposes at this facility. The welding
operations are not subject to 40 CFR Part 63 Subpart XXXXXX(6X) GACT,NESHAP for Nine
Fabrication and Finishing Area Source Categories, since the primary SIC code 3357 (nonferrous
wire drawing/insulating)and NAICS code 335921 (fiber optic cable manufacturing)of this
facility does not match the SIC or NAICS listed in the NESHAP 6X rule.
9. Summary of changes needed to the current permit:
a. The description of the insignificant/exempt activity, flexible resin vacuum system venting
to a fabric filter(ID No. IFR), should be changed to flexible resin vacuum systems
venting to filter systems(ID No.IFR).
b. The description of the insignificant/exempt activity, IMPDE—five(5)MPDE storage
silos should be changed to IMDPE—five(5)MDPE storage silos.
C. MRO DAQ received a letter and 02Q .0318 notification form on August 12,2019 from
this company regarding the addition of six improved jacket marking lines (IJM; ID Nos.
IJMO 1-IJM06),which will vent through a fume extraction system and then to a HEPA
filter and carbon filtration prior to exhausting inside the building of this facility. These
sources appear to qualify for an exemption since they have no exhaust to the outside
atmosphere and the potential VOC emissions for all six units are below the exemption
threshold limit of 5 tons per year as indicated in 15A NCAC 2Q .0102(h)(5).
d. MRO DAQ received a letter and 02Q .0318 Notification Form on February 14, 2020
from this company regarding the addition of a new extrusion process 5 (ID Nos. E0501-
E0504)containing four extrusion lines with two of the extrusion lines being new lines
and two are existing lines that will be moved from extrusion process 1 (ID Nos. E107 and
E108); a new extrusion process 6 containing one new extrusion line(ID No. E0601) and
a new extrusion process 7(ID Nos. E0701-E0706)containing six extrusion lines that will
be moved from the existing extrusion process 4 with 5 lines being modified(ID Nos.
E402 through E406)and the sixth line(ID No. E401)will be moved without being
modified.
e. The electronic yellowsheet for permit changes needed has been completed and placed in
the facility's electronic file.
10. Compliance assistance offered duringthe he inspection:
None.

Corning Optical Communications,LLC—HMTC
July 14,2021
Page 15
11. Section 112(r)applicability:
This facility does not appear to be subject to the requirements of the Chemical Accident Release
Prevention Program, Section 112(r)of the Clean Air Act.
12. Compliance determination:
Based on my observations, this facility appeared to be in compliance with the applicable air
quality regulations at the time of the inspection.
DLC:dlc
c: MRO File
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