20240226_ADI_Response

NORRIS & TUNSTALL
CONSULTING ENGINEERS P.C.
2602 Iron Gate Dr. Suite 102 1429 Ash-Little River Road
Wilmington,NC 28412 Ash,NC 28420
[phone] [phone]
[phone] Fax [phone] Fax
John S.Tunstall,P.E. J.Phillip Norris,P.E.
T.Jason Clark,P.E. Joseph K.Bland,P.E.
Robbie P.Hennelly,E.I.
February 22, 2024
Adam Parr
Assistant State Mining Engineer
NC DEQ - Division of Land Resources
Land Quality Section — 5t" Floor
512 N. Salisbury Street
Raleigh, NC 27604
Re: Review Comment Response
Coastal Land and Sand Company, LLC Mine
Mining Permit No. 10-92
Brunswick County, NC
NT Project No. 21113
Dear Mr. Parr,
We are responding below in red to your comment letter dated June 28, 2023, as follows:
1. Please provide proof of registration with the Division of Water Resources Groundwater
Management Branch for dewatering activities. We are in the process of obtaining this
information from the Mine Manager.
2. Please provide proof you have submitted your NOI for your NPDES permit. See attached.
3. Please clearly indicate and label on the mine map the entire mine permit boundary. The
mine map should show the existing permit boundary as well as the proposed addition to the
mine permit boundary. The mine permit boundary has been updated.
4. Please clearly indicate and label on the mine map the existing pit and all affected areas
associated with the permit. If you are proposing to release reclaimed areas of the mine permit
boundary. Please show the area as it exists on the current permit and clearly indicate which
areas are proposed to be released. The existing pit is shown as well as the mine permit boundary
being revised to include disturbed areas and areas proposed to be used for beneficial fill.
5. N.C.G.S. §74-49 defines "affected land" as the surface are of land that is mined, the
surface area of land associated with a mining activity so that soil is exposed to accelerated
erosion, the surface area of land on which overburden and waste is deposited, and the surface
area of land used for processing or treatment plant, stockpiles, nonpublic roads, and settling
ponds. Please clearly indicate and label on the mine map that the haul road to the nearest public
road is included in the Mine permit boundary. The existing dirt road that has been used for
access in previous permits has now been included in the mine permit boundary as requested.
NCBELS License C-3641

Mr. Adam Parr
Review Comment Response
Coastal Land and Sand Company, LLC Mine
NT Project No. 21113
February 22, 2024
Page 3
6. Please clearly indicate and label on the mine map the extents of the 100 year flood plain.
The 100 yr floodplain has been identified on the mine maps.
7. Mining has been indicated in the floodplain. Please provide proof of notice and approval
from the jurisdictional floodplain manager. Enclosed is a letter indicating approval of Pit 2 as
requested.
8. The current permit is issued to Coastal Land & Sand Company, LLC. Please clarify the
response in the application where the applicant is listed as Tripp's Construction Company. A
transfer of the permit will require letters signed from both the new applicant as well as the current
permittee requesting the transfer of the permit. The proposed modification will remain in Coastal
Land & Sand Company, LLC.
9. Please clearly indicate and label on the mine map all structures located within 300' of the
excavation limits. There is a structure located south of the existing excavation that does not
appear on the mine map. All structures within 300' of the excavation area are identified on the
revised plans.
10. Please clearly indicate and label on the mine map the location of all existing wells that lie
within 500 feet of the proposed excavation or clarify whether the dwellings indicated on the mine
map are serviced by county or municipal water systems. Existing wells within 500' of the
excavation limits have been identified on the plans.
11. Please provide construction and maintenance details of the construction entrance.
Please clearly identify the location of the entrance on the mine map. Please clarify if this
entrance will occur at the entrance to the State Maintained Road or at the entrance of the
operation. Construction and Maintenance details have been provided as requested. The gravel
construction entrance is shown at the edge of pavement.
12. The buffer proposed on the mine map changes from 25' to 50' at various location around
the excavation. There are places on the mine map that show buffer less than 50' in vicinity of
wetlands. Please clarify how you will maintain the proposed buffer around the excavation.
Please clarify how you will ensure that the 50' wetlands buffer is not encroached upon. The
buffers have been updated. A minimum 50' buffer is shown where the excavation area is in
proximity to the wetlands. A 25' buffer is identified in areas where the excavation area is adjacent
to uplands.
13. During a recent site inspection, it was noted that one of the old borrow pits/existing ponds
that is marked on the mine map as reclaimed as pond is being filled in. Please clarify this activity.
Please be advised that there should be no land disturbing activity associated with this permit
occurring outside the permit boundary. The applicant desires to fill previous permitted/reclaimed
pit areas with beneficial fill back to original grade. This area has been included in the revised
permit boundary.
14. Please clarify and provide additional details on your dewatering plan. The application
states that dewatering will occur at a rate of 500,000 gal/day, and the mine map states that
dewatering will occur at a rate of 95,000 gal/day. The existing pond that is being dewatered into
is functioning as an erosion control measure and needs to be included in the mine permit
NCBELS License C-3641

Mr. Adam Parr
Review Comment Response
Coastal Land and Sand Company, LLC Mine
NT Project No. 21113
February 22, 2024
Page 3
boundary. The application has been revised to match the plans with a proposed dewatering rate
of 95,000 gpd. The existing pond has been included in the permit boundary as requested.
15. During a recent site inspection, the existing pond outlet was not observed or installed.
Please provide additional details on the existing pond outlet, including construction and
maintenance details. Please clarify how you will prevent erosion/scouring and elevated turbidity
as water is discharged from the pond to the wetlands. The existing Operator has indicated that
an outlet is not necessary. They indicate that the basin fluctuates with the ground water table
but never overtops the basin.
16. Please provide an estimate of the discharge rate from the pond and provide an
explanation as to how this impacts the hydrology of the wetlands. The basin self-regulates
without the need for an outlet structure.
17. Please provide a wetlands delineation or a Jurisdictional Determination for the wetlands
identified on the mine map. A wetland JD is included for your use as requested.
18. During a recent site inspection, it was noted that the affected area boundaries (Condition
5 of your permit) were not clearly marked. Please mark all affected area boundaries and provide
proof of the marking or contact the Wilmington Regional Office so that they may verify the
markings are in place. The operator has indicated that they will mark/identify all updated affected
area boundaries upon review of this response prior to the request for the bond.
Thank you for your assistance with this project.
Sincerely,
NORRIS & TUNSTALL
CONSULTING ENGINEERS, P.C.
i
oseph K. Bland, P.E.
J KB/ttw
21113 02-22-24 s mine Itr resp
cc: Dave Tripp
NCBELS License C-3641

NORRIS & TUNSTALL
CONSULTING ENGINEERS P.C.
2602 Iron Gate Dr. Suite 102 1429 Ash-Little 1Ziver Road
V41mington,NC 28412 Ash,NC 28420
[phone] [phone]
[phone] Fax [phone] Fax
John S.Tunstall,P.E. J.Phillip Norris,P.E.
T.Jason Clark,P.E. Joseph K.Bland,P.E.
Robbie P.Hennelly,E.I.
February 22, 2024
Via Federal Express
NCDEQ — Stormwater Program
512 N. Salisbury St., Office 640K
Raleigh, NC 27604
Re: Notice of Intent General Permit for Dewatering Submittal
Coastal Land and Sand Company, LLC
Mine Permit No. 10-92
Brunswick County, NC
NT Project No. 21113
Dear Reviewer,
In connection with the subject project, please find enclosed the following:
$120.00 Processing Fee
• Notice of Intent
• Dewatering Calcs
• Pump Operation and Monitoring Plan
USACE Wetland Delineation (SAW-2021-00384-AJD) issued 08-18-2021
• NC SOS Annual Report & LLC Consent
Please review this information for approval and contact us with any questions or comments you
may have. Thank you for your assistance on this project.
Sincerely,
NORRIS & TUNSTALL
CONSULTING ENGINEERS, P.C.
seph K. Bland , P.E.
KB/ttw
23113 02-22-24 sw Itr-dewatering
cc: Dave Tripp
NCBELS License C-3641

NORTH CAROLINA MINING State of North Carolina 1612 Mail Service Center
PERMIT APPLICATION Department of Environmental Quality Raleigh, NC 27699-1612
Division of Energy, Mineral,and Land Resources [phone]
C)Will any part of the proposed mine excavation(s)extend below the water table?
EYES NO
If yes,do you intend to dewater the excavation(s)?
YES NO
Estimated withdrawal rate in gallons per day: 95,000•00
If yes,what impact,if any,will mine dewatering have on neighboring wells?Locate all existing wells on the mine
map(s)that lie within 500 feet of the proposed excavation area. Provide data to support any conclusions or statement
made,including any monitoring well data,well construction data, and current water withdrawal rates. Indicate whether
the proposed mine locale is served by a public water system or private wells.
No adverse effect is anticipated due to the distance to existing wells.
D)If you answered yes to any of the above questions, provide evidence that you have applied for or obtained the
appropriate water quality permit(s)(i.e., non-discharge, NPDES,Stormwater,etc.)from the Stormwater Program. In
addition,the applicant is required to register water use with the Division of Water Resources,Ground Water
Management Branch,if the operation withdraws more than 10,000 gallons per day and needs a capacity use permit
from the Division of Water Resources,Ground Water Management Branch,if the operation lies in a capacity use area
and withdraws more than 100,000 gallons per day.
A NPDES Permit has been applied for.
4. A)Will the operation involve crushing or any other air contaminant emissions?
YES zNO
If yes,indicate evidence that you have applied for or obtained an air quality permit issued by the Division of Air Quality
or local governing body.
B)How will dust from stockpiles,haul roads,etc.,be controlled?
Water truck will be used as needed to control dust.
Revised September 21, 2021 1 7
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