20230920_ADI_19-16

�diHESTAT-Q,
ROY COOPER
Governor ? i' - r
ELIZABETH S.BISER
Secretary
Q AM VIOL
WILLIAM E.TOBY VINSON,JR. NORTH CAROLINA
Interim Director Environmental Quality
September 20, 2023
Certified Mail
Return Receipt Requested
7022 0410 0003 1130 7182
Andrew Miller
3M Company
4191 Highway 87 South
Moncure,NC 27312
RE: Pittsboro Mine
Mining Permit No. 19-16
Chatham County
Cape Fear River Basin
Dear Mr. Miller:
We have reviewed the modification request your company submitted for the referenced mine site. In order for this
office to complete its review of the referenced project in accordance with N.C.G.S. §74-50 and§74-51 of the Mining
Act of 1971,please provide the additional or revised information in accordance with the following comments:
1. Please verify that the overburden waste pile has been engineered to avoid slope stability issues.
2. It is difficult to see affected area boundaries and boundaries of excavations,plant area,overburden area
etc. Please submit a map with increased line weight or hatching to clearly identify these areas. Please
consider also submitting a version without the imagery base layer.
3. Details on the proposed changes to Outfall 3 and 4 and the symbology/hatching for their features are
difficult to discern.
a. Please provide enlarged inset/detail for area of Outfall 3 and 4.
b. Please provide a separate map for the entire site (same area and scale as Sheet C-716)without
the imagery as background. Please show all mine features, buffers, and erosion control
measures on this map.
c. Please provide enlarged inserts for each of the stormwater outfall locations (existing and
proposed).
4. The plan submitted shows outdated references including "Ponds to be built in 2019". Please provide
updated erosion and sediment control plan sheets that reflect the current site conditions including any
updated plan details, sediment basins, haul roads, diversion ditches, outfalls, as well as other erosion
and sediment control features. The existing E&SC plan last revised 2017 and updated 2021 should be
updated to include the proposed stormwater changes.
5. Please clearly identify and label on the mine map the latitude and longitude of permit boundary corners
so field verification of permit boundaries can be conducted during future inspections.
D E Q North Carolina Department of Environmental Quality I Division of Energy,Mineral and Land Resources
512 North Salisbury Street 1 1612 Mail Service Center I Raleigh,North Carolina 27699-1612
NORhI CAROLINA -
oaaa�emaienmronmenmiuuality /`� 919.707.9200

Certified Mail
7022 0410 0003 1130 7182
Mr. Miller
Page 2
6. Please provide clarification regarding the "Forestry Activities" and limits thereof that are to continue
in unrnined areas. Please clearly identify and label the Forestry Activity boundaries. Be advised that
removal of significant numbers of the existing trees may necessitate additional screening measures in
some locations.
7. Sheet C717 referenced in the application was not included as a map submission.
8. The affected area table does not match the affected area table included in the application.
9. Their previous 401/404,Buffer Authorization,and Buffer Determination have all expired. Please verify
that you will contact the USACE and DWR prior to impacting surface waters.
Please note, this office may request additional information not included in this letter, as the mining application
review progresses. Be advised that our review cannot be completed until all of the items listed above have been
fully addressed.
In order to complete the processing of your application,please forward two(2)copies of the requested information
to my attention at the following address:
Division of Energy,Mineral and Land Resources
Department of Environmental Quality
1612 Mail Service Center
Raleigh,NC 27699-1612
If hand delivering or delivering by shipping company(e.g.,FedEx,UPS),please deliver to our physical address:
Division of Energy,Mineral, and Land Resources
Department of Environmental Quality
512 N. Salisbury Street, 5th Floor
Raleigh,NC 27604
As required by 15A NCAC 513.0113,you are hereby advised that you have 180 days from the date of your receipt
of this letter to submit all of the requested information. If you are unable to meet this deadline and wish to request
additional time,you must submit information,in writing,to the Director clearly indicating why the deadline cannot
be met and request that an extension of time be granted. If an extension of time is not granted, a decision will be
made to grant or deny the mining permit based upon the information currently in the Department's files at the end
of the 180-day period.
Though the preceding statement cites the maximum time limit for your response,we encourage you to provide the
additional information requested by this letter as soon as possible. Your prompt response will help us to complete
processing your application sooner.
Please contact me at(919) 707-9220 if you have any questions.
Sincerely,
Adam Parr,PE �-
Acting State Mining Engineer
cc: Mr. Bill Denton, PE