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Home My WebLink AboutNCG020330_2023 DMR_20230822 NCDEQ Division of Energy, Mineral and Land Resources Stormwater Discharge Monitoring Report (DMR) Form for NCG020000 Active and Inactive Mining Sites Click here for instructions Complete,sign,scan and submit the DMR via the Stormwater NPDES Permit Data Monitoring Report(DMR) Upload form. Mail the original,signed hard copy of the DMR to the appropriate DEMLR Regional Office. Certificate of Coverage No. NCG020330 Person Collecting Samples:Jennifer Cassada, ECT Facility Name:3M Pittsboro Laboratory Name:Pace Analytical Services Eden Facility County:Chatham Laboratory Cert. No.:633 Discharge during this period:❑■ Yes ❑ No (if no,skip to signature and date) Has your facility implemented mandatory Tier response actions this sample period for any benchmark exceedances?❑■ Yes ❑ No If so,which Tier(I, II, or III)? Tier I &Tier II (SW benchmark excedance) A copy of this DMR has been uploaded electronically via https://edocs.deq.nc.gov/Forms/SW-DMR •Yes ❑ No Date Uploaded: V JZ2/Z-o Z 3 Analytical Monitoring Requirements for Outfalls with Industrial Activities—Benchmarks in 'Red) Parameter Parameter Outfall Outfall Outfall Outfall Outfall Code N/A Receiving Stream Class 001 N/A Date Sample Collected MM/DD/YYYY 7/31/2023 46529 24-Hour Rainfall in inches 0.06 00545 Settleable Solids(SS) 0.1 mg/I) .90 C0530 TSS in mg/L 00 or 50*) 1500 00070 Turbidity of discharge`* 2260 - Turbidity downstream of discharge** NA Turbidity upstream of discharge NA Additional parameters for outfalls in drainage areas that use>55 gallons per month of new hydraulic oil on average NCOIL Estimated New Motor/Hydraulic Oil Usage in gal/month 00552 Non-Polar Oil&Grease in mg/L Additional parameters for Clay Mines 01105 Aluminum,total in mg/L .75 FW, 01092 Zinc,total(as Zn)in mg/L 0.126 FW, 095 SW) 00951 Fluoride,total in mg/L(6.0) 00900 Hardness,total 00400 pH,in standard units(6.0-9.0 FW, 01097 Antimony,total in mg/L(0.34 FW, A SW) 01002 Arsenic,total in mg/L 0.15 FW,0.069 C0034 Chromium Ill in mg/L 0.905 FW,N/. Additional parameters for Feldspar Ore Mines 01105 Aluminum,total in mg/L lu.i. rod, 01092 Zinc,total(as Zn)in mg/L 0.126 FW _35 SW) 00951 Fluoride,total in mg/L Additional parameters for Lithium Ore Mines 01105 Aluminum,total in mg/L 00951 Fluoride,total in mg/L Additional parameters for Phosphate Mines 00951 Fluoride,total in mg/L 39344 Alpha,Gross Particle Activity Additional parameters for Industrial Sand Mines 00951 Fluoride,total in mg/L C00334 Chromium III in mg/L 39344 Alpha,Gross Particle Activity Outfalls to Outstanding Resource Waters(ORW),High Quality Waters(HQW),Trout Waters(Tr)and Primary Nursery Areas(PNA) have a benchmark TSS limit of .All other water classifications have a benchmark of See F-5 of the NCG020000 General Permit for turbidity requirements. (Freshwater) (Saltwater) Notes(optional):See below. "I certify by my signature below,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 inform ion,inclu ' the possibili f fines and imprisonment for knowing violations." Z Z Signature of P mittee Delegated Authorized Individual Date dhasan2@mmm.com 919.642.4010 Email Address Phone Number The above results for OF-001 are from the drawdown of the basin upstream of OF-001, performed on July 31, 2023, in order to conduct proper maintenance (i.e. accumulated sediment removal) of the basin. In accordance with January 18, 2022, guidance provided by Michael Lawyer and Paul Clark with NC DEQ DEMLR, the discharge of stormwater from the basin drawdown to an outfall/surface waters of the state are authorized under General Permit NCG020000. Additionally, if monitoring under conditions NCG020000 has not occurred for the current monitoring period, then the drawdown discharge should be sampled and monitored accordingly. Results of sampling are provided in this DMR submittal. Please accept this correspondence as the required written notice of benchmark exceedance, as required under NCGO2 Section F-9 Table 6; during Qtr 3, 2023. The benchmarks for Total Suspended Solids (TSS), Settleable Solids (SS), and Turbidity were exceeded at outfall 001. The following precautions were taken to minimize loading to the outfall/stream during drawdown of the basin: • Drawdown from the top of the basin via pump with skimmer attached; • Filter bag attached to the pump discharge • Sample taken from filter bag discharge Please be advised that this outfall was under Tier II status prior to the July 31 sampling. Given the results the outfall shall remain in Tier II Status until three consecutive samples are under the benchmark or are inside the benchmark range for all parameters. Upstream SCMs were cleaned out during this sampling event and 3M Pittsboro plans to resample this outfall during the next measurable storm event which produces a discharge. Additionally, please note that this notification of exceedance is being submitted after the 14 day requirement. However, 3M Pittsboro conducted a stormwater management inspection of all outfalls on 8/11/2023. The basin was returned to normal capacity following the July 31, 2023 cleanout, and no other items of concern were noted.