NCG210420_2022 DMR_20230124

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina DEMLR General Permit No. NCG210000
Date submitted 1/10/2023
CERTIFICATE OF COVERAGE NO. NCG21 0 4 2 0 SAMPLE COLLECTION YEAR 2022
FACILITY NAME Enviva Pellets Ahoskie,LLC SAMPLE PERIOD ❑Jan-June ❑July-Dec
COUNTY Hertford or ❑ Monthly' (month)
PERSON COLLECTING SAMPLES Joe Harrell DISCHARGING TO CLASS ❑ORW EHQW ❑Trout ❑PNA
LABORATORY Lab Cert.# ❑Zero-flow ['Water Supply ❑SA
Comments on sample collection or analysis: ['Other c,rvsw,Ahoskie Creek
PLEASE REMEMBER TO SIGN ON THE REVERSE -*
Part A: Stormwater Benchmarks and Monitoring Results(Monitoring is required only if the facility stores exposed accumulations of sawdust,wood chips,
bark, mulch,or other similar material on site for longer than seven (7)days.)
Q No discharge this period?2
Date Sample 24-hour rainfall
Outfall No. Collected' amount,
(mo/dd/yr) Inches3 Chemical Oxygen Demand Total Suspended Solids
Benchmarks=__> - - 120 mg/L 100 mg/L or 50 mg/L4
1 10/3/2022 4.38 unable to sample adverse weather conditions
2 10/3/2022 4.38
3 10/3/2022 4.38
4 10/3/2022 4.38
5 10/3/2022 4.38
1 Monthly sampling(instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
2 For sampling periods with no discharge at any single outfall,you must still submit this discharge monitoring report with a checkmark here.
3The total precipitation must be recorded using data from an on-site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
°See General Permit text,Table 3, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Note: Results must be reported in numerical format. For example,do not report Below Detection Limit, BDL,<PQL, Non-detect, ND,or other similar non-
numerical format. When results are below the applicable limits,they must be reported in the format,"<XX mp,/L",where XX is the numerical value of the
detection limit, reporting limit,etc. in mg/L.
Note: If you report a sample value in excess of the benchmark,you must implement Tier 1, Tier 2,or Tier 3 responses. See General Permit text.
Permit Date:8/1/2018-7/31/2023 SWU-245,last revised 8/6/2018
Page 1 of 2

Part B: Vehicle Maintenance Area Monitoring Results:only for facilities averaging> 55 gal of new oil per month.
n No discharge this period?2
Outfall No. Date Sample 24-hour rainfall
Collected' amount, Non-polar O&G by EPA Total Suspended Solids
(mo/dd/yr) Inches3 1664(SGT-HEM)
Benchmarks===> - - 15 mg/L 100 mg/L or 50 mg/L4
Footnotes from Part A also apply to this Part B
Note: If you report a sample value in excess of the benchmark,you must implement Tier 1, Tier 2,or Tier 3 responses. See General Permit text.
FOR PART A AND PART B MONITORING RESULTS:
• A BENCHMARK EXCEEDANCE TRIGGERS TIER 1 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• 2 EXCEEDANCES IN A ROW FOR THE SAME PARAMETER AT THE SAME OUTFALL TRIGGER TIER 2 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• TIER 3: HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES FOR THE SAME PARAMETER AT ANY ONE OUTFALL? YES ❑NO❑
IF YES,HAVE YOU CONTACTED THE DEMLR REGIONAL OFFICE? YES ❑NO❑
REGIONAL OFFICE CONTACT NAME:
Mail an original and one copy of this DMR,including all"No Discharge"reports, within 30 days of receipt of the lab results(or at end of monitoring period
in the case of"No Discharge"reports)to:
Division of Water Resources
Attn: DWR Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware that there are significant penalties for submitting false Information,including the possibility of fines and imprisonment for knowing violations."
! to L3
ature of Permittee) ( to
Permit Date:8/1/2018-7/31/2023 SWU-245,last revised 8/6/2018
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Date inches Flow Sampler
7/6/2022 0.21 No Discharge Joe Harrell
7/9/2022 0.53 No Discharge Joe Harrell
7/10/2022 0.41 No Discharge Joe Harrell
7/13/2022 0.38 No Discharge Joe Harrell
7/16/2022 0.24 No Discharge Joe Harrell
7/26/2022 0.78 No Discharge Joe Harrell
7/30/2022 0.53 No Discharge Joe Harrell
8/1/2022 0.21 No Discharge Joe Harrell
9/6/2022 0.25 No Discharge Joe Harrell
9/22/2022 0.13 No Discharge Joe Harrell
10/3/2022 4.38 Unable to pull sample due to adverse weather conditions(Hurricane Ian) Joe Harrell
11/1/2022 0.73 No Discharge Joe Harrell
11/11/2022 0.72 No Discharge Joe Harrell
11/15/2022 0.4 No Discharge Joe Harrell
11/25/2022 0.63 No Discharge Joe Harrell
11/27/2022 0.2 No Discharge Joe Harrell
11/30/2022 0.42 No Discharge Joe Harrell
12/3/2022 0.1 No Discharge Joe Harrell
12/15/2022 1.28 No Discharge Joe Harrell
12/22/2022 0.81 No Discharge Joe Harrell
12/23/2022 1 No Discharge Joe Harrell
12/31/2022 0.24 No Discharge Joe Harrell