7305_Duke_Mayo_PTORenewMeeting_FID1279662.20190130

2019-01-30 Mayo Industrial Landfill Meeting Notes Page 1 of 3

Mayo Landfill (PN 7305-INDUS) Permit Renewal and Inspection
1/30/2019 10:00 am Mayo Steam Electric Plant

Attendees:
NCDEQ Division of Waste management (DWM):
Ben Jackson, Shawn McKee, David Giachini (observer)
Duke: Kimberlee Witt, Michael Lazar, Cedric Fairbanks, Evan Andrews,
Issa Zarzar, Sharat Gollamudi
Golder: Michael Kircher

1. Safety Level 1 (Mike Lazar)
2. Introductions (all)
3. Meeting overview (Kim Witt, Evan Andrews) a. original permit highlights b. discussion about initial volume projections and permitted airspace
4. Permit renewal submittal package general overview (Mike Lazar) 5. Operations Plan overview and updates (Mike Lazar, Kim Witt, Evan Andrews, Mike Kircher) a. revision summary log notes primary changes
b. Sect 1.5 - Hours of Operation:discussed language for storage of waste material during off-hours c. Sect 1.8 - Record Keeping: updated to include additional leachate collection system data
d. Sect 2.1 - Waste Handling: updated to be consistent across Duke NC fleet; waste placement including handling and guidelines has been updated
e. Sect 2.1.7 - Compaction and Cover Requirements: updated to include a Quality
Assurance Plan in the appendices f. Sect 2.3 - Leachate Collection and Removal: updated to include recent discussions,
communication, and approvals from DWM; a contingency plan section was added
g. Dust Control Plan - no change, general overview of the plan was provided h. Operations Quality Assurance Plan - new, general overview of the plan was provided
6. Closure Post Closure Care Plan overview and updates (Mike Lazar, Kim Witt) a. noted overall capacity revision due to actual grading of future features b. closure/post closure costs have been updated and Duke noted the need for
review/concurrence ahead of permit renewal (for inclusion in annual Financial Assurance due 3/31/2019)
7. Engineering Plan overview and updates (Mike Lazar)
a. revision summary log notes primary changes b. no changes to items like settlement and stability calculations
c. changes were made to the leachate collection system language
d. drawings with significant revisions: i. EP-13: general changes to leachate headworks pipe
ii. EP-14: alterations to leachate force main system valves/vaults
iii. EP-14A: revisions to leachate force main clean-out and spool vaults; pressure indicators added at various locations
iv. EP-14B: revision to air release valves; recent re-torqueing process was discussed
8. Facility Plan overview and updates (Mike Lazar, Evan Andrews) a. revision summary log notes primary changes
b. Sect 4.0: revision to disposal rates; revision to full landfill buildout acreage realized
during detailed grading efforts of future appurtenances such as sediment basins, which altered the anticipated total waste footprint and volume
2019-01-30 Mayo Industrial Landfill Meeting Notes Page 2 of 3

c. Table 1 - Airspace volume: phases have been refined, some may not appear in figures due
to the phase being vertical (no new footprint); initial Permit to Operate has an error in the
gross capacity table (the gross capacity of the individual phases does not total 24.6M cy as noted; permit pg 9, Specific Conditions, #28; refined capacity in the recent submittal
should be used when the permit is updated)
d. drawings with significant revisions: i. FP-1(and other overall layout sheets): overall landfill boundary changed realized
during detailed grading of appurtenances ii. all general phasing plans have been revised iii. FP-16: overall access road
9. Water Quality Monitoring Plan overview and updates (Kim Witt) a. updated to bring the plan in alignment with general Duke WQMP at other NC facilities 10. Update on recent leachate release event (Mike Lazar, Evan Andrews, Kim Witt, Issa Zarzar)
a. investigation update i. failed weld has been verified as a factory weld; ii. failure mechanism not yet identified, still under investigation
b. investigation efforts currently under way i. review system design;
ii. review of CQA documents;
iii. water balance investigation iv. surface water sampling in Bowes Branch occurred on 1/29/2019 with additional
sampling being conducted 1/31/2019
v. NCDEQ asked about pressure testing of the system - (Duke/Golder) confirmed that pressure testing was performed prior to placing the force main in service;
then explained that pressure testing at the time of system install is completed primarily for leaks, not stress on the pipe to the point of weld failure c. potential force main additions/alterations being explored
i. level indicators in select vaults; ii. additional flow meters
iii. potential to alter the flow preferential path away from Bowes Branch;
iv. ongoing investigation might warrant additional operational or engineered changes d. ongoing field investigation work:
i. pipe section (clean-out) with failed weld will be removed at flanges 1. anticipated to occur this week
2. visual inspection of the pipe section will be performed
3. forensics evaluation of pipe section - pipe section will be sent to Baton Rouge, LA for lab forensics; various tests will be performed; report
offering opinion of failure cause should be provided
ii. CO-2 vault will be leak tested to confirm water resistance integrity of vault iii. a soil sampling work plan for the area around CO-2 vault is being developed for
submittal to NCDEQ DWM on 2/1/2019 11. Field Inspection - at approximately1:00pm the group proceeded to the Industrial Landfill for inspection. The CO-2 vault was inspected on the drive in to the landfill area. The vault hatches were
open for inspection. After a Safe Start briefing at the landfill office by the landfill foreman, the group viewed the following areas
a. landfill working face - operations was shut down to allow an up close detailed view of
operations b. leachate tank farm - the level indicator on the tanks was ~13-ft on all three tanks c. sump area control panels - level indicators were viewed and pumps were cycling at the
time of inspection
2019-01-30 Mayo Industrial Landfill Meeting Notes Page 3 of 3

d. leachate transfer area - the pump control panel was locked by tag to prevent leachate
flows from being diverted to the leg of the force main system that was out of service;
inspection of the controls could not be performed at the time of visit 12. Action Items
a. Approval/concurrence of Closure/Post Closure cost estimates ahead of permit renewal for
inclusion in annual Financial Assurance update due to NCDEQ 3/31/2019 - Ben Jackson b. Soil Sampling Work Plan submitted to NCDEQ DWM 2/1/2019 (Kim Witt)
c. Follow up with NCDEQ DWM Hydrogeologist (Elizabeth Werner) regarding submittal information for surface water sampling (Kim Witt) d. Solid Waste Environmental Event Reporting form for CO-2 leachate release due to
NCDEQ DWM 2/1/2019 (Kim Witt) 13. The meeting/inspection adjourned at approximately 3:00pm