NCG030511_Letter RE SW Characterization Discharge_20240618

3M Monroe 4320 Goldmine Road
Monroe, NC 28110
June 18, 2024
Sent via email: [e-mail]
Mike Lawyer
DEMLR Stormwater Program
512 N.Salisbury St.
6th floor
Raleigh, NC 27604
Subject: 3M Monroe Request for Discharge Authorization
Mr. Lawyer:
Enclosed with this letter are data tables showing concentrations of constituents sampled under the 3M
Water Management Standard (WMS) Program at the 3M Monroe facility. 3M previously submitted the
data reports for these constituents to the Department of Environmental Quality. Copies of the data
reports are available upon request.
3M is providing these data to fully disclose characteristics of stormwater discharges. Included in the data
tables, are concentrations for per-and polyfluoroalkyl (PFAS)substances.The data tables for Q1 and Q2
2024 are being submitted as a voluntary characterization of stormwater discharges from the site.This is
consistent with the Clean Water Act(40 CFR§ 122.28) requirement to submit complete permit
applications for stormwater discharges and a 1994 USEPA Memorandum regarding Scope of Discharge
Authorizations. Please note that we plan to continue submitting lab reports as voluntary supplemental
information.
3M is requesting written confirmation that the ongoing discharge of the conventional and PFAS
constituents presented below, along with all the USEPA Method 537.1 constituents, continue to be
authorized under General Permit No. NCG030000.We are requesting written confirmation of receipt of
this letter by email or mail. If you have any questions or comments,we are willing to meet and discuss
them. If you have any initial questions or comments, please contact Gina Cyprych, one of our Water
Quality Environmental Special at(412) 892-0653 or by email at gcyprych( ,m) .Com
Sincerely,
P11V ()O_L(,YY'�
�U� Ol�rl
Plant Director
Cc: Matt Diering, 3M Monroe EHS Supervisor
Mary-Kate Scurlock, 3M Monroe Senior EHS Technician
Gina Cyprych, 3M Global EHS Water Quality Environmental Specialist
Peter Koranchie-Boah, 3M Global EHS Water Quality Environmental Specialist
Enclosure
Page 1 of 2

3M Monroe
Discharge Authorization Request June 2024
Data Addendum Tables
Table 1.3M Monroe Stormwater PFAS Constituents Data-Outfall SW001
Analyte Q12024 ng/L
4:2 Fluorotelomer sulfonic acid <0.4
6:2 Fluorotelomer sulfonic acid <0.4
8:2 Fluorotelomer sulfonic acid <0.48
Perfluorobutanesulfonic acid 0.4
Perfluorobutanoic acid 4.6
Perfluorohexanesulfonic acid <0.16
Perfluorohexanoic acid 5.8
Perfluorooctanesulfonic acid 0.44
Perfluorooctanoic acid 2.6
<=constituent was not detected at the method detection limit(MDL),
Table 2.3M Monroe Stormwater HAS Constituents Data-Outfall SWO02
Analyte Q12024 ng/L
4:2 Fluorotelomer sulfonic acid <1.3
6:2 Fluorotelomer sulfonic acid <1.3
8:2 Fluorotelomer sulfonic acid <1,5
Perfluorobutanesulfonic acid 1.3
Perfluorobutanoic acid <2.5
Perfluorohexanesulfonic acid 0.53
Perfluorohexanoic acid 3.2
Perfluorooctanesulfonic acid <1.3
Perfluorooctanoic acid 2.2
<=constituent was not detected at the MDL.
Table 3.3M Monroe Stormwater PFAS Constituents Data-Outfall SWO03
Analyte Q12024 ng/L
4:2 Fluorotelomer sulfonic acid <0.41
6:2 Fluorotelomer sulfonic acid <0.41
8:2 Fluorotelomer sulfonic acid <0.49
Perfluorobutanesulfonic acid 0.38
Perfluorobutanoic acid 2.7
Perfluorohexanesulfonic acid <0.16
Perfluorohexanoic acid 1.7
Perfluorooctanesulfonic acid 1.6
Perfluorooctanoic acid 0.6
<=constituent was not detected at the method detection limit.
Table 4.3M Monroe Stormwater PFAS Constituents Data-Outfall SWO04
r Analyte Q12024 ng/L
uorote omer su onic aci
6:2 Fluorotelomer sulfonic acid <0.41
8:2 Fluorotelomer sulfonic acid <0.49
Perfluorobutanesulfonic acid 0.76
Perfluorobutanoic acid 5.8
Perfluorohexanesulfonic acid 0.29
Perfluorohexanoic acid 3
Perfluorooctanesulfonic acid 1.2
Perfluorooctanoic acid 1.7
<=constituent was not detected at the method detection limit.
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