NCS000533_Technical Correction_20230915

�rtt.STA7p a,�
u�
ROY COOPER a x a.:
u � o
Governor �C
ELIZZABETH S.BISERa R�
Secretary *`Z`°LLr
WILLIAM E.TOBY VINSON,A NORTH CAROLINA
interim Director Environmental Quality
September 15, 2023
Stefanie Harding, Site Leader
Entegris, Inc.
333 Neils Eddy Rd
Riegelwood,NC 28456
Subject: Change-Page to Correct Error
NPDES Permit NCS000533
Entegris, Inc.
Columbus County
Dear Permittee:
The Division of Energy, Mineral,and Land Resources (the Division) became aware of an error in your
recently issued permit (September 7, 2023). On September 13, 2023, Stefanie Harding notified us
the issued permit contained proprietary information. Accordingly, we hereby forward the modified
permit pages to amend your permit changing the outfall description for SW010. Please insert these
change pages into your existing permit and discard the old pages. We regret any inconvenience this
causes your organization.
Please note that 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 the Division of Division of
Energy, Mineral, and Land Resources or any other Federal, State, or Local governmental permits
that may be required.
If you have questions, or if we can be of further service, please contact Brianna Young at
[e-mail] or call 919-707-3647.
Sincerely,
Michael Lawyer, Stormwater Program Supervisor
Division of Energy, Mineral, and Land Resources
Attachments: NPDES Stormwater Permit NCS000533
cc: NPDES Stormwater Program Files(Lasedche)
Wilmington Regional Office
WSS/Aquatic Toxicology Branch
Qu Qi, DWM/Superfund Section
David Mattison, DWM/Superfund Section
D �;� North Carolina Department of Environmental Quality I Division of Energy.Mineral and Land Resources
_ 512 North Salisbury Street 1 1612 Mall Service Center I Raleigh,North Carolina 77699-1612
919.707.9200

Adam Acker,US EPA, Superfund Program
Craig Zeller,US EPA, Superfund Program
Regina Ward,EHS Specialist,Entegris,LLC

Permit NCS000533
*Summer:April 1 —October 31
*Winter:November 1 —March 31
Footnotes:
1. Measurement frequency: Quarterly during a measurable storm event. If the facility is monitoring
monthly due to Tier Two or Tier Three response actions,the facility shall continue a monthly
monitoring and reporting schedule in Tier Two or Tier Three status until relief is granted.
2. If pH values outside this range are recorded in sampled stormwater discharges,but ambient
precipitation pH levels are lower,then the lower threshold of this benchmark range is the pH of
the precipitation(within instrument accuracy) instead of 6 s.u.. Readings from an on-site or local
rain gauge(or local precipitation data)must be documented to demonstrate background
concentrations were below the benchmark pH range.
3. For each sampled measurable storm event, the total precipitation must be recorded.An on-site
rain gauge is required. Where isolated sites are unmanned for extended periods of time, a local
rain gauge reading may be substitute for an on-site reading.
4. Monitoring for pH shall be conducted at the effluent,upstream,and downstream of the
discharge point.
5. Hardness sampling should be performed in conjunction with testing for hardness dependent
metals(copper, lead,and zinc).
6. Acute toxicity shall be performed in accordance with Appendix A. Acute Toxicity Pass/Fail
Monitoring(Quarterly).
• Outfall SW001: Drainage area includes drum warehouse chemical storage area,
maintenance shop area, and a lined monofil pond from adjacent manufacturer Oak-Bark
Corp.
• Outfall SW002: Drainage area includes the Low Volume Manufacturing Area, chemical
storage area, and runoff from adjacent manufacturer Bakelite and their methanol tanks
and formaldehyde operation.
• Outfall SW005: Drainage area includes hazardous waste tank storage tanks, High
Volume Manufacturing Area, chemical staging areas, a filtration area, and methanol
unloading and formaldehyde production from adjacent manufacturer Bakelite.
• Outfall SWO10: Drainage area includes potential runoff from chemical storage areas,
Low Volume Production Area, and a building containing a distillation unit.
Should the permittee identify or create any new stormwater outfalls, remove any stormwater
outfalls identified in this permit, or alter any drainage areas that change the potential pollutants in
runoff discharged through corresponding outfalls, the permittee will submit a request to NC
DEMLR to modify this permit. For any newly discovered pipes or outfalls, the permittee must
evaluate the structure and provide a report of the status and planned actions to NC DEQ within
14 days. The permittee must either(1) request modification of this permit and modify the
SWPPP accordingly, or(2) eliminate potential discharges by removal, plugging, or combination
of both.
Page 14 of 41

Permit NCS000533
D-3. Methodology for Collecting Samples
(a) Outfall monitoring efforts shall begin with the first measurable storm event that occurs
during the facility's normal operating hours and begins at least 72 hours after the previous
measurable storm event.
(b) Grab samples shall be collected within the first 30 minutes of discharge. If physical
separation between outfalls prevents collecting samples from all outfalls within the first 30
minutes of discharge, then the permittee may continue collecting samples until all outfalls
that are discharging have been sampled.
(c) Outfalls that are not discharging during or after the first measurable storm event shall be
sampled during the next measurable storm event, until a sample has been collected from
every outfall.
(d) If, during an entire monitoring period, there is no discharge from an outfall during any
measurable storm event that occurs during the facility's normal operating hours and
begins at least 72 hours after the previous measurable storm event, then the permittee shall
report "No Discharge" in the DMR and shall record"No Discharge" in the SWPPP. In this
case, the DMR shall be submitted within 30 days after the end of the monitoring period.
Lack of a discharge from an outfall for the monitoring period shall not constitute failure to
monitor as long as this condition is met.
(e) Sampling is not required to be performed outside of the facility's normal operating hours
or during adverse weather conditions.
(f) Samples collected shall be characteristic of the volume and nature of the permitted
discharge.
(g) If the sampled storm event coincides with a known non-stormwater discharge that is
deemed permitted under 15A NCAC 02H .0106, then this shall be noted on the
stormwater discharge monitoring report.
D-4._Locations for Collecting Samples
Samples shall be collected at all stormwater discharge outfalls (SDOs)that discharge stormwater
associated with industrial activity. If the Division has issued a representative outfall status (ROS)
approval letter, then the permittee shall collect samples from all SDOs in accordance with the
ROS approval letter.
(a) All samples shall be taken before the discharge joins or is diluted by any other waste
stream, body of water, or substance.
(b) Monitoring points as specified in this permit shall not be changed without written
notification to and approval by the Division [40 CFR 122.41(j)].
D-5. Tier One Response: Single Benchmark Exceedance
The outfall(s) will remain in Tier One status until three consecutive samples are under the
benchmark or are inside the benchmark range for all parameters.
(a) If any sampling result is above the benchmark value for any parameter at any outfall, then
the permittee shall respond in accordance with Table 2 to identify and address the source
of that exceedance for the parameter(s).
Page 15 of 41