NC0088773_Issuance of Permit_20181110

y ROY COOPER
Governor
'M1 ;z_ ` 6% . MICHAEL S. REGAN
5 :' Secretary
LINDA CULPEPPER
., a 00 Interim Director
NORTH CAROLINA
Environmental Quality
•
November 19, 2018
Mr. Darren Cammin, Site Leader
Dow Silicones Corporation
2914 Patterson Street
Greensboro, NC 27407
Subject: NPDES Permit NC0088773
Transfer of Ownership/Permit Modification
Grade PC-1 Biological WCPS
Guilford County -
Dear Mr. Cammin:
The Division hereby re-issues permit NC0088773. This action is taken to document the new owner
of the subject facility. This permit is issued pursuant to the requirements of North Carolina General
Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S.
Environmental Protection Agency dated October 15, 2007 (or as subsequently amended).
If any parts, measurement frequencies, or sampling requirements contained in this permit are
unacceptable, you have the right to an adjudicatory hearing, upon written request submitted within
thirty (30) days after receiving this letter. Your request must take the form of a written petition
conforming to Chapter 150B of North Carolina General Statutes, and you must file it with the Office of
Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such
a demand is made, this permit shall remain final and binding.
This permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal
requirements to obtain other permits which may be required by any other Federal, state, or local
government.
If you have any questions concerning this matter, please contact Emily Phillips at (919) 707-
3621 or via e-mail [[e-mail]].
0 erely,
/Linda Culpepper
Interim Director, NCDEQ
cc: NPDES File
Susan Meadows, Aquatic Toxicology Branch
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh,NC 27699-1617
919 807 6300 919-807-6389 FAX
https://deq.nc.gov/about/divisions/water-resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits

Permit NC0088773
Grade PC-1 Biological Water Pollution Control System [15A NCAC 08G .0302]
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provisions of North Carolina General Statute 143-215.1, other
lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control
Act, as amended,
Dow Silicones Corporation
is hereby authorized to discharge wastewater from a facility located at the
2914 Patterson Street, Greensboro
Guilford County
to receiving waters designated as an unnamed tributary (UT) to South Buffalo Creek
in the Cape Fear River Basin in accordance with effluent limitations, monitoring
requirements, and other conditions set forth in Parts I, II, III, and IV hereof.
The permit shall become effective November 19, 2018.
This permit and the authorization to discharge shall expire at midnight on June 30,
2023.
Signed this day November 19, 2018.
/4,
` da Culpepper
Interim Director, Division of Water Resources •
By Authority of the Environmental Management Commission
Page 1 of 7

Permit NC0088773
Grade PC-1 Biological Water Pollution Control System [15A NCAC 08G .0302]
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are
hereby revoked.As of this permit issuance, any previously issued permit bearing this number
is no longer effective. Therefore, the exclusive authority to operate and discharge from this
facility arises under the permit conditions, requirements, terms, and provisions included
herein.
Dow Silicones Corporation
is hereby authorized to:
1. continue to operate a 0.001 MGD groundwater-remediation system to remove
volatile organic compounds, including chlorinated hydrocarbons, that includes the
following components:
• equalization tank
• air stripper
• granulated activated carbon (GAC) filter
• discharge line
• final effluent percolation to constructed wetlands
located at 2914 Patterson Street, Greensboro, in Guilford County and
2. discharge from said treatment works via Outfall 001, at a location specified on the
attached map, to an unnamed tributary (UT) to the South Buffalo Creek [Stream
Segment 16-11-14-2], a waterbody currently classified WS-V; NSW within sub-
basin 03-06-02 of the Cape Fear River Basin.
Page 2 of 7

Permit NC0088773
Grade PC-1 Biological Water Pollution Control System [15A NCAC 08G .0302]
PART I.
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge treated groundwater from Outfall 001. Such discharges shall be
limited, monitored' and reported by the Permittee as specified below:
EFFLUENT •PERMIT LIMITS MONITORING
CHARACTERISTICS 2 REQUIREMENTS
Monthly Daily Measurement Sample Sample
[Parameter Codes] Average Maximum Frequency Type Location
Flow 3 50050 0.001 MGD Continuous Recording Effluent
Total Suspended Solids C0530 30.0 mg/L 45.0 mg/L Monthly Grab Effluent
Acetone 81552 Quarterly Grab Effluent
2-Butanone 78356 Quarterly Grab Effluent
Chloroethane 34311 Quarterly Grab Effluent
Chloroform 32106 Quarterly Grab Effluent
1,1 -Dichloroethane (1,1 DCA) 34496 Quarterly Grab Effluent
1,2-Dichloroethane (1,2(DCA) 32103 Quarterly Grab Effluent
1,2-Dichloropropane (1,2 DCP) 34541 Quarterly Grab Effluent
Methylene Chloride 34423 Quarterly Grab Effluent
1,1,1-Trichloroethane (1,1,1 TCA) 34506 Quarterly Grab Effluent
Trichlorofluoromethane 34488 Quarterly Grab Effluent
Vinyl Chloride 39175 Quarterly Grab Effluent
Total Xylenes 81551 Quarterly Grab Effluent
WET Testing-Chronic Toxicity 4 TGP3B Quarterly Grab Effluent
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using the
Division's eDMR system [See Section A. (3.)].
2. All effluent samples shall be collected concurrently with chronic WET test sampling.
3. Flow may be measured using a totalising flow meter.
4. Whole Effluent Toxicity (WET) testing, limited; Chronic (Ceriodaphnia dubia) @ 90% effluent
concentration in January, April, July, and October [see Section A. (2.)].
There shall be no discharge of floating solids or foam visible in other than trace amounts.
Page 3 of 7

Permit NC0088773
Grade PC-1 Biological Water Pollution Control System [15A NCAC 08G .0302]
A (2). CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B .0200 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or
significant mortality to Ceriodaphnia dubia at an effluent concentration of 90%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures
outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised
December 2010, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure" (Revised- December 2010) or subsequent versions. The tests will be
performed during the months of January, April, July, and October. These months signify
the first month of each three-month toxicity testing quarter assigned to the facility. Effluent
sampling for this testing must be obtained during representative effluent discharge and shall
be performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or a
ChV below the permit limit, then multiple-concentration testing shall be performed at a
minimum, in each of the two following months, as described in "North Carolina Phase II
Chronic Whole Effluent Toxicity Test Procedure" (Revised-December 2010) or subsequent
versions.
All toxicity testing results required as part of this permit condition will be entered on the
Effluent Discharge Monitoring Form (MR-1) for the months in which tests were performed,
using the parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value.
Additionally, DWR Form AT-3 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later
than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical
measurements and all concentration/response data, and be certified by laboratory
supervisor and ORC or approved designate signature. Total residual chlorine of the effluent
toxicity sample must be measured and reported if chlorine is employed for disinfection of the
waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity
monitoring is required, the permittee will complete the information located at the top of the
aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number,
county, and the month/year of the report with the notation of"No Flow" in the comment area
of the form. The report shall be submitted to the Water Sciences Section at the address cited
above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, .
monitoring will be required during the following month. Assessment of toxicity compliance is
Page 4 of 7

Permit NC0088773
Grade PC-1 Biological Water Pollution Control System [15A NCAC 08G .0302]
based on the toxicity testing quarter, which is the three-month time interval that begins on
the first day of the month in which toxicity testing is required by this permit and continues
until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North
Carolina Division of Water Resources indicate potential impacts to the receiving stream, this
permit may be re-opened and modified to include alternate monitoring requirements or
limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as
minimum control organism survival, minimum control organism reproduction, and
appropriate environmental controls, shall constitute an invalid test and will require
immediate follow-up testing to be completed no later than the last day of the month following
the month of the initial monitoring.
A. (3.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[NCGS 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports
(DMRs) and program reports. The final NPDES Electronic Reporting Rule was adopted
and became effective on December 21, 2015.
NOTE: This special condition supplements or supersedes the following sections within
Part II of this permit (Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting Requirements (Supersedes Section D. (2.) and Section E. (5.) (a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each
month and submitted electronically using eDMR. The eDMR system allows permitted
facilities to enter monitoring data and submit DMRs electronically using the internet.
Until such time that the state's eDMR application is compliant with EPA's Cross-Media
Electronic Reporting Regulation (CROMERR), permittees will be required to submit all
discharge monitoring data to the state electronically using eDMR and will be required to
complete the eDMR submission by printing, signing, and submitting one signed original
and a copy of the computer printed eDMR to the following address:
NC DENR / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Page 5 of 7

Permit NC0088773
Grade PC-1 Biological Water Pollution Control System [15A NCAC 08G .0302]
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due
to the facility being physically located in an area where less than 10 percent of the
households have broadband access, then a temporary waiver from the NPDES electronic
reporting requirements may be granted and discharge monitoring data may be submitted
on paper DMR forms (MR 1, 1.1, 2, 3) or alternative forms approved by the Director.
Duplicate signed copies shall be submitted to the mailing address above. See "How to
' Request a Waiver from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month
following the issuance of the permit or in the case of a new facility, on the last day of the
month following the commencement of discharge.
Starting on December 21, 2020, the permittee must electronically report the following
compliance monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 316(b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to
Request a Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at
the time of each electronic submission. The permittee should use the EPA's website
resources to identify the initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means
the entity (EPA or the state authorized by EPA to implement the NPDES program) that is
the designated entity for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting
tool for each type of electronic submission and for each state. Instructions on how to
access and use the appropriate electronic reporting tool will be available as well.
Information on EPA's NPDES Electronic Reporting Rule is found at:
https://wvvw.federalregister.gov/documents/2015/10/22/2015-24954/national-
pollutant-discharge-elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the "Reporting Requirements"
section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To
obtain an electronic reporting waiver, a permittee must first submit an electronic
reporting waiver request to the Division. Requests for temporary electronic reporting
waivers must be submitted in writing to the Division for written approval at least sixty
(60) days prior to the date the facility would be required under this permit to begin
Page 6 of 7

Permit NC0088773
Grade PC-1 Biological Water Pollution Control System [15A NCAC 08G .0302]
submitting monitoring data and reports. The duration of a temporary waiver shall not
exceed 5 years and shall thereupon expire. At such time, monitoring data and reports
shall be submitted electronically to the Division unless the permittee re-applies for and is
granted a new temporary electronic reporting waiver by the Division. Approved electronic
reporting waivers are not transferrable. Only permittees with an approved reporting
waiver request may submit monitoring data and reports on paper to the Division for the
period that the approved reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are
found on the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B.
(11.) (d)l
All eDMRs submitted to the permit issuing authority shall be signed by a person
described in Part II, Section B. (11.)(a) or by a duly authorized representative of that
person as described in Part II, Section B. (11.)(b). A person, and not a position, must be
delegated signatory authority for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an
eDMR user account and login credentials to access the eDMR system. For more
information on North Carolina's eDMR system, registering for eDMR and obtaining an
eDMR user account, please visit the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system
shall make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF
CERTIFICATION WILL BE ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared
under my direction or supervision in accordance with a system designed to assure that
qualified personnel properly gather and evaluate the information submitted. Based on my
inquiry of the person or persons who manage the system, or those persons directly
responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fines and
imprisonment for knowing violations."
5. Records Retention [Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years
from the date of the report. This period may be extended by request of the Director at any
time [40 CFR 122.41].
Page 7 of 7

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Dow Silicones Corporation— NC0088773 i Facility •
ReceivingStream: Location
Latitude:
UT to South Buffalo Creek 36°03'14" ..
Stream Class: WS-V; NSW Longitude: North Guilford County
Sub-basin: 03-06-02 79°51'04" (map not to scale)