Buechel Stone Steel Gray Mine NOI Application package 2021.10

Memo
SUBJECT
Buechel Stone — Steel Gray Mine Stormwater Application
DATE
October 29, 2021
DEPARTMENT
30105159
COPIES TO
Chris Bucy — Buechel Stone
Brad Karls — Buechel Stone
ARCADIS
TO
NC DEQ — DEMLR Stormwater
OUR REF
30105159
PROJECT NUMBER
30105159
1►Ia1Jd=
Christopher Peters, PG
517.324.5052, 517.927.3611 (m), [e-mail]
See attached for Stormwater Permit Application for Buechel Stone Corporation Steel Gray Mine, Spruce Pine,
North Carolina.
Section 1 —Application Form
Section 2 - Figures (D-sized Plan Sheets)
Figure 1 — Quadrangle Map
Figure 2 — Site Plan — Proposed Plan Modification
Figure 3 — Approximate Drainage Area and Stormwater Features
Section 3 — Attachment 1
Details of erosion and stormwater management features
Stormwater calculations
Arcadis U.S., Inc., 300 S Washington Square, Suite 315, Lansing, Michigan, 517 337 0111, www.arcadis.com 1/1
Cover memo BSC Steel Gray Mine Stormwater app revised.docx

Section 1
Application Form

Division of Energy, Mineral, and Land Resources Land Quality Section
National Pollutant Discharge Elimination System
NCG020000
This general permit covers STORMWA TER AND/OR WASTEWATER DISCHARGES
associated with activities under SIC (Standard Industrial Classification) Code 14
[Mineral Mining Industry] except for: peat mining, coal mining, metal mining,
oil and gas extraction, tourist gem mines, NCDOT borrow pits, in -stream sand
mining, and discharges from mining operations which are intermixed on site
with storm water from concrete operations. You can find information on the
DEMLR Stormwater Program at deq.nc.gov/SW.
Directions: Print or type all entries on this application form. Send the original,
signed application with all required items listed in Item (9) below to: NCDEMLR
Stormwater Program, 512 N. Salisbury St., 1612 MSC, Raleigh, NC 27699-1612.
The submission of this form does not guarantee coverage under the General Permit. Prior to coverage under this
General Permit a site inspection will be conducted.
1. Owner/Operator (to whom all permit correspondence will be mailed):
FOR AGENCY USE ONLY
Date Received
Year
Month
Day
Certificate of Coverage
N
C
G
0
2
Check #
Amount
Permit Assigned to
Name of legal organizational entity:
Legally responsible person as signed in Item (10) below:
Buechel Stone Corporation
Chris Bucy
Street address:
City:
State and zip code:
7274 Hwy 221 N
Marion
NC, 28752
Telephone number:
Email address:
828-756-8220
[e-mail]
2. Industrial Facility (facility being permitted):
Facility name:
Facility environmental contact:
Steel Gray Mine
Chris Bucy
Street address:
City:
State and zip code:
Altapass Hwy
Spruce Pine
NC, 28777
Telephone Number:
Email address:
Latitude of entrance: 35.904930
Longitude of entrance:-82.032428
Parcel Identification Number (PIN)
1709-00-27-4028
4-digit SIC code:
Facility is:
Date operation is to begin or began:
1499
❑ New ElProposed ❑� Existing
�20110
Brief description of the types of minerals mined at this facility:
black quartzite
Is this a processing -only facility for materials mined elsewhere?
Is this an inactive mine site?
❑ Yes
❑ Yes
❑' No
❑' No
Does total area of this mine site include ready -mixed concrete plant and/or asphalt plant areas?
❑Yes, and has separate NPDES stormwater permits (provide permit numbers):
❑Yes, and does not have separate NPDES stormwater permits
❑� No
Does this facility already have a valid Mining Permit from DEMLR's Land Quality Section?
❑� Yes (please provide the Mining Permit Number) 61-19
❑ No (please indicate the status of the Mining Permit application)
Page 1 of 8

Are you applying for a discharge permit in the same location as a previously permitted mine?
El Yes (please provide permit number and mine name)
❑s No
If the stormwater discharges to a municipal separate storm sewer system (MS4), name the operator of the MS4:
❑� N/A
3. Consultant (if applicable):
4.
Name of consultant:
Consulting firm:
Christopher S. Peters
Arcadis US, Inc.
Street address:
City:
State and zip code:
300 S Washington Square Suite 315
Lansing
MI 48933
Telephone number:
Email address:
517-324-5052
[e-mail]
Development Activities and Buffers
Mining operation will precede development activities at this site:
❑ Yes
❑✓ No
Mine is located within one of the 20 Coastal Counties, and will it add more than 10,000 ft2 of impervious surface:
El Yes (to both)
❑ No, this mine is within one of the 20 Coastal Counties, but will not at more than 10,000 ft2 of impervious surface
❑✓ No, this mine is not within one of the 20 Coastal Counties
Mine is in the Neuse, Tar -Pamlico, or Catawba River Basins, OR in the Randleman or Jordan Water supply Watersheds?
❑ Yes (specify size of stream buffers)
❑✓ No
5. Mine Dewatering
Mine dewatering will occur at this site:
❑ Yes ❑� No (mark N/A for the rest of this section)
Mine dewatering from this facility will be discharged to:
❑Surface Waters and/or Wetlands
❑Other (specify)
❑Mine will not discharge dewatering to Surface Waters and/or Wetlands; specify
how dewatering will occur and where
water will be directed:
❑� N/A
Wetlands and/or Surface Waters are within 400' of the mine pit perimeter:
404/401 Certification permits required:
[]Yes (specify distance)
❑Yes (briefly describe)
❑ No
❑ No
❑� N/A
❑✓ N/A
Have you been required to obtain a wetland delineation certified by the US Army Corps of Engineers?
❑ Yes (please attach to this application) ❑� No
6. Wastewater Treatment
Will this facility wash mined materials?
❑ Yes ❑s No
Will discharges of process wastewater treatment systems occur (including possible recycle system overflows)
❑Yes (please describe)
❑✓ No
Page 2 of 8

Will this facility employ chemical additives to flocculate suspended solids?
❑Yes (specify name/manufacturer/quantity of daily use)
❑✓ No
Note: please visit: https://files.nc.gov/ncdeg/Water+Quality/Environmental+Sciences/ATU/PAM8 30 18.pdf for list of
approved PAMS
Will any of the wastewater treatment facilities at this mine overflow only during rainfall events that exceed the 10-yr, 24-hr
rainfall event?
❑ Yes (specify which systems)
❑✓ No
Are wastewater treatment facilities (including recycle systems) planned in the 100-year flood plain?
❑Yes ❑� No
Wastewater Treatment Alternative Review as required by 15A NCAC 2H.0105(c)(2)
Types of wastewater this mine site will discharge: ❑ Mine Dewatering ❑ Process Wastewater
Types of wastewater considered for this alternative review: ❑ Mine Dewatering ❑ Process Wastewater
Are there existing sewer lines within a one -mile radius?
❑ Yes
❑ Wastewater treatment plant will accept wastewater
❑ Is feasible to connect (explain)
❑ Is not feasible to connect (explain)
❑ Wastewater treatment plant will not accept wastewater (please attach letter documenting this)
❑� No
Are you already proposing a closed -loop recycle system (CLRS) that meets design requirements of 15A NCAC 2T .10000?
❑Yes, for dewatering
❑ Yes, for process wastewater
❑ Yes, for both
❑ No, this option is technologically feasible (explain)
❑ No, this option is not technologically feasible (explain)
❑ No, this option is otherwise feasible (explain)
❑� No, this option is otherwise not feasible (explain)
Eventually water would have to be discharged to surface water. Surface water runs downhill and unless it is discharged to groundwater eventually it would have to be discharged.
What is the feasibility of building a CLRS compared to direct surface water discharge?
Surface or Subsurface Disposal System
❑ A surface or subsurface disposal system is technologically feasible (explain)
❑ A surface or subsurface disposal system is not technologically feasible (explain)
❑ A surface or subsurface disposal system is otherwise feasible to implement (explain)
OA surface of subsurface disposal system is not otherwise feasible to implement (explain)
Given the low permeability of the rock discharge to groundwater is not feasible.
What is the feasibility of employing a subsurface of surface discharge as compared to a direct discharge to surface waters?
Direct discharge to surface water is the most technologically feasible option. Stormwater would be retained in a sedimentation basin before discharge to remove particulate matter
Direct Discharge to surface waters is the most environmentally sound alternative to all reasonably cost-effective options
for the wastewaters being considered?
❑� Yes
❑ No
Page 3 of 8

If this review included all wastewater discharge types, would excluding some types make any of the above non -discharge
options feasible for some the wastewaters?
❑ Yes
❑✓ No
7. Outfalls(s) At least one outfall is required to be eligible for coverage.
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is impaired.
001
North Toe River
WS-V; Tr
❑This watershed has a TMDL.
Discharge from this outfall is from:
❑✓ Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑✓ Only during a rainfall event
❑ Intermittently (please indicate how often)
❑ Continuously (please indicate flow in CFS)
Latitude of outfall: 35054'7.64"N
Longitude of outfall: 82' 2'3.95"W
Brief description of the industrial activities that drain to this outfall:
Stormwater from holding ponds
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑' No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
3-4 digit identifier:
Name of receiving water:
Classification:
❑This water is impaired.
❑ This watershed has a TMDL.
Discharge from this outfall is from:
❑ Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
❑ Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is impaired.
❑This watershed has a TMDL.
Discharge from this outfall is from:
❑ Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
❑ Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
Page 4 of 8

All outfalls must be listed and at least one outfall is required. Additional outfalls may be added in the section
"Additional Outfalls" found on the last page of this NOI.
8. Other Facility Conditions (check all that apply and explain accordingly):
❑This facility has any other NPDES permits. If checked, list the permit numbers for all current NPDES permits:
MTh is facility has Non -Discharge permits (e.g. recycle permit). If checked, list the permit numbers for all current Non -
Discharge permits:
❑✓ This facility uses best management practices or structural stormwater control measures.
If checked, briefly describe the practices/measures and show on site diagram:
Retention basin to prevent sediment/particulate matter from discharging to surface water. Hay bales as needed to hold back sediemnt
❑This facility has a Stormwater Pollution Prevention Plan (SWPPP).
If checked, please list date that SWPPP was implemented:
❑ This facility stores hazardous waste stored in the 100-year floodplain.
If checked, describe how the area is protected from flooding:
❑ This facility is a (mark all that apply)
❑ Hazardous Waste Generation Facility
❑ Hazardous Waste Treatment Facility
❑ Hazardous Waste Storage Facility
❑ Hazardous Waste Disposal Facility
If checked, indicate:
Kilograms of waste generated each month:
Type(s) of waste:
How material is stored:
Where material is stored:
Number of waste shipments per year:
Name of transport/disposal vendor:
Transport/disposal vendor EPA ID:
Vendor address:
❑ This facility is located on a Brownfield or SUPERFUND site
If checked, briefly describe the site conditions:
❑ Facility provides appropriate secondary containment for bulk storage of liquid materials
If checked, briefly describe these measures:
❑ Site has an active landfill within the mining permit boundary
If checked, please indicate type:
a) ❑ LCID (Land clearing and Inert Debris)
b) []other (specify)
9. Required Items (Application will be returned unless all of the following items have been included):
❑� Check for $100 made payable to NCDEQ
❑ Copy of most recent Annual Report to the NC Secretary of State
❑� This completed application and any supporting documentation
❑� Copy of the approved mining permit or indication of mining permit application status
❑ Copy of US Army Corps — approved wetland delineation (if applicable)
Page 5 of 8

❑� Line drawing of the water flow through the facility or block flow diagram
❑� Pictorial description of the nature of any sources of water and any collection and treatment measures
❑� A site diagram showing, at a minimum, existing and proposed:
a) outline of drainage areas
b) surface waters
c) stormwater management structures
d) location of stormwater outfalls corresponding to the drainage areas
e) runoff conveyance features
f) areas where materials are stored
g) impervious areas
h) site property lines
❑✓ 2 copies of large scale (24"x36" minimum) site plan showing:
a) topographical lines
b) all outfall locations
c) applicable buffers and delineated wetlands
d) receiving waters
e) 100-year flood plain (if applicable)
❑✓ Copy of county map or USGS quad sheet with the location of the facility clearly marked
If mines site is in one of the 20 Coastal Counties (if applicable)
❑ Applicant has check with the appropriate regional office to verify the need for a Coastal State Stormwater permit.
a) Indicate the Regional Office Contact:
❑✓ Detailed list of:
a) impervious surface areas and percentages
b) sub -drainage areas
c) total drainage area
If mine is dewatering and near wetlands, or may otherwise impact surface waters or groundwater (if
applicable)
❑� 2 copies of large scale (24"06" minimum) plans delineating areas on the listing acreage including:
a) wetlands
b) ditches
c) well -placements
d) pits
e) borrow areas
f) overburden storage
g) stormwater controls/BMPs
h) vehicle maintenance areas
i) settling basins
j) product process (such as screening, stockpiles, and waste piles)
k) total drainage area
1) impervious surface percentages (if state Stormwater programs apply)
m) applicable buffers
n) access and/or haul roads
❑ Pump dewatering size and information on its specifications
❑ Well information (design, depths, maintenance)
❑ Physical monitoring for the wetland areas
❑ Settling pond size information, if applicable
❑ Level spreader design, if applicable
❑ Details about dewatering method
❑ Cone of influence calculations
Page 6 of 8

❑✓ Description of measures to prevent erosion and flooding
❑ Description and information about 401/404 permits that have been obtained
❑ Copy of US Army Corps of Engineers wetlands delineations or approved wetland delineation (if applicable)
❑ I have contacted my local regional office about a Pumping Operation and Monitoring (POM) plan
a) Regional Office Contact:
b) Date Contacted:
10. Applicant Certification:
North Carolina General Statute 143-215.613(i) provides that: Any person who knowingly makes any false statement,
representation, or certification in any application, record, report, plan, or other document filed or required to be maintained
under this Article or a rule implementing this Article ... shall be guilty of a Class 2 misdemeanor which may include a fine not
to exceed ten thousand dollars ($10,000). 1 hereby request coverage under the referenced General Permit.
Under penalty of law, I certify that:
❑� I am the person responsible for the permitted industrial activity, for satisfying the requirements of this permit, and for
any civil or criminal penalties incurred due to violations of this permit.
❑✓ The information submitted in this N01 is, to the best of my knowledge and belief, true, accurate, and complete based on
my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the
information.
❑� I will abide by all conditions of the NCG02 permit. I understand that coverage under this permit will constitute the
permit requirements for the discharge(s) and is enforceable in the same manner as an individual permit.
❑� I hereby request coverage under the NCG020000 General Permit and understand that coverage under this permit will
constitute the permit requirements for the discharge(s) and is enforceable in the same manner as an individual permit.
Printed Name of Person Signing:
Title:
(Signature of Applicant)
10/29/2021
(Date Signed)
Mail the entire package to: DEMLR— Stormwater Program
Department of Environmental Quality
512 N. Salisbury Street, 6t" floor
1612 Mail Service Center
Raleigh, NC 27699-1612
Page 7 of 8

Additional Outfalls
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is on the 303(d) list.
❑ This watershed has a TMDL.
Discharge from this outfall is from:
❑ Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
❑ Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is on the 303(d) list.
❑ This watershed has a TMDL.
Discharge from this outfall is from:
❑ Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
❑ Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is on the 303(d) list.
❑This watershed has a TMDL.
Discharge from this outfall is from:
❑Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
❑ Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
Page 8 of 8

Section 2
Figures (D-Sized Plan Sheets)

w
3
z C Kalmia
^ 19 4 a
Pendley Cem o Z iNER
0
o
ul,��r�
e
l
Blalock
kT
�OJ BIGGIRST PQ a
z600
Tempo Mtn o
SITE LOCATION,.
0 P Z z 0800
boo > o ?o
z
o z ti
o ��PQP z600 �� o
30
,MICA- enport Cemm ❑ pG A p00
ST�2600 vF 3
l
tiA Arnold Knob
oyT �
Pa
\ \ \ N
! 18
o0
Q
Gurley Cem
SOU C \^� �FT Vance Tunnel
R�000 o 9P�Po N \y Altapass
o0
Z
9
\2
'P
Z� A
REFERENCE: BASE MAP USGS 7.5. MIN. TOPO. QUAD., SPRUCE PINE, NC, 2017
0 2000' 4000'
w Approximate Scale: 1 in. = 2000 ft.
BUECHEL STONE CORPORATION
a STEEL GRAY MINE
z SPRUCE PINE, NORTH CAROLINA
af
AREA
wLOCATION SITE LOCATION MAP
a
¢w
�Q
m
w FIGURE
N= OAARCADIS
xm NORTH CAROLINA

z
Q
J
d
W
H
Z
O
Q
U
LL
0
O
2
Z
Q
J
a_
O
d
Lu
Z
c�
0
0
N
0
N
N
LL
U
0
d
c
0
U
0
z
W
Z
a_
W
U
D
d
U
W_
E
Q
O
W
(D
9 Lu
of J
W�
J �
00 W
Lu >-
ZW
O�
cl)m
J
W
U Q
W
D00
m�
U)CN
U N
oCD
0
0
(9 0
cl) Lu
H
m
U
Q LLj
� J
� Q
0 ~
� W
OF-
�C/)
F-
jn 0
J
U d
WELL • PARCEL 303000
QUEEN RUTH
h PROPERTY
ou
12
10_±t
\ \ DITCH DB-2
DITCH DB-2A CULVERT C-1
\ %v--1 10
1
\ OUTFALL 01 1
-20
PARCEL qs 801010 \ -
s QUEEN RUTH \ �"
ISI� PROPERTY \
Y \AO.
WELL
\ PARCEL 174300
\ QUEEN RUT
PROPERTY
\
r � \
Lu
� � \ PARCEL 32200
Q GLENN BLAKE &
J \
BETHANY
0 U \ PRO ERTYQ
O QLu
\
ry
d \
ry
y
z
�a-zO 0
W
QwLLLiLU
�J
a U) n _
O
m m 0
W LL
= LL LL
w�w000
0 ::) U U , \
x M M Z Z
PARCEL 75800
GREENE MARK ROGE
PROPERTY
qsy
R
40
NIP
PARCEL 158900
HOLLIFIELD COY ETAL PROPERTY
120
110
100
PARCEL 9200 LEGEND:
\ �ENOSJEFFREYPROPERTY 25' UNDISTURBED BUFFER
---------------------- 50' UNEXCAVATED BUFFER
— — — — — — PERMIT BOUNDARY
PARCEL 14630 (12.74 ACRES)
All \ ENOS JEFFREY & D NISE PREVIOUSLY MINED AREA — UNDERGOING
PARCEL 290300 BATES PROPERT
QUINN VICKIE PROPERTY RECLAMATION (3.67 ACRES)
\ PROPOSED HAUL ROADS
\ \ (0.65 ACRES)
\ UNEXCAVATED BUFFER (1.00 ACRES)
\ PARCEL 0900
\ \ UNDISTURBED BUFFER (3.30 ACRES)
BUTLERFRAN BETH
` PROPERTY
PROPOSED MINING AREA
I I x" E, �'/'
(0.70 ACRES)
FEMA FLOOD HAZARD LIMIT
PARCEL 180200 � —
SEDIMENTATION AND STORMWATER PONDS
LAWS MATTHEW DALE & CARA ��\ (0.058 ACRES)
HOLLI PROPERTY \ L
\ \ \ OU TFALL LOCATION
RESIDENTIAL WELL
3/.": +� 90
0
130
120
115
105
91 1
61
80
*1 1)
we, ll�*
i
\- -
\ \PARCE►_ 28900
\%4BRYANT YRON & \
SUSAN PR ERTY \
\/� / PARCEL 140500
1(ANCEY TIMBER RESOURCES — —
LLC PROPERTY
\
PARCEL 190900
BUTLER FRANK & BETH
PROPERTY
PARCEL 80500
MORGAN THERAL E & LYNNE S
PROPERTY
SOURCE:
1. BASEMAP COORDINATE SPACE IS NORTH CAROLINA STATE
PLANE, NAD83 (NC83F).
2. PARCEL DATA PROVIDED BY MITCHELL COUNTY, NC83F
PUBLISHED APRIL 2021.
3. SURVEY FILE PROVIDED BY MOUNTAINEER LAND SURVEYING.
4. AERIAL PROVIDED BY 2021 MICROSOFT CORPORATION,
DISTRIBUTION AIRBUS DS 2021.
0 100' 200'
GRAPHIC SCALE

w
J
m
Q
I-
w
J
}
H
U)
0
J
d
i
d
w
U)
w
C7
Q
d
2
U
w
H
U)
2
J_
U)
O
N
L
w
Q
0
Q
Q
N
M
N
O
N
O
N
O
0
w
Q
U)
M
H
0
Q
J
O
Q
w
LL
U)
w
Q
z
Q
0
X
0
Of
0-
IL
CL
U)
0
O
N
O
N
LL
0
0
^L
LL
0
L
U
0
z
w
z
a
w
U
Z)
ry
0-
U)
w
w
Q
c�
w
c�
0
ry
w
J
m
w
z
0
U)
J
w w
2 —
J
w D
D
m
(b w
Q w
U
0m
0
Og
co Q
M
2i O
m O
N
Q O
0 N
0� rn
Q N
O
N �
�L
w
00
�2 LL
W
U
6i
Q
z
H
U
w
0
d
w
Q
v/
u-
Nw
L.L
X
mllellizill
25' UNDISTURBED BUFFER
50' UNEXCAVATED BUFFER
— — — — — — PERMIT BOUNDARY
(12.74 ACRES)
PROPOSED HAUL ROADS
(0.65 ACRES)
UNEXCAVATED BUFFER (1.00 ACRES)
UNDISTURBED BUFFER (3.30 ACRES)
PROPOSED MINING AREA
(0.70 ACRES)
FEM A FLOOD HAZARD LIMIT
SEDIMENTATION AND STORMWATER
--J PONDS
❑ OU TFALL LOCATION
APPROXIMATE LIMITS OF DRAINAGE
AREA
SURFACE WATER FLOWLINES
SOURCE:
1. BASEMAP COORDINATE SPACE IS NORTH CAROLINA STATE
PLANE, NAD83 (NC83F).
2. PARCEL DATA PROVIDED BY MITCHELL COUNTY, NC83F,
PUBLISHED APRIL 2021.
3. SURVEY FILE PROVIDED BY MOUNTAINEER LAND SURVEYING.
4. AERIAL PROVIDED BY 2021 MICROSOFT CORPORATION,
DISTRIBUTION AIRBUS DS 2021.
0 3 0' 6 0'
GRAPHIC SCALE

Section 3
Attachment 1:
• Details of Erosion and Stormwater Management Features
• Stormwater Calculation

U
N
7
14
15
16 17 18 19 1 20
0 0
a�
C) N
00,
21
LI
GI
E
u
4
Compacted soil 2'
\ I+ min >I
i �Ilfll•-�ii��ill✓-=iiiil—III •�-uf
=III I III I
�-- 6' typical --%
Figure 6.2Da Temperary earthen diversion dike.
Coarse aggregate
Diversion Berm
OONh
18" min
3:1 max
Figure 6.20b Temporary gravel civersion dike for vehicle crossing imodfied from Va
Cross -Section t=" min. of NCDOT#5 — r 5 'Ilw Details
or 957 wisbed store -t __ ----------
•t m.r Top of rock abutment
15
360U c� tt/ocrc rr `i �.'#� � 2' min
h, P\•� 'A11 * s +rr m5' Slope foundatlon t• SpIlwuy
Figure 6.633 Rack Dam elan view and
Sol way caleiis Filter fabr c
,v 1
,ti 1.5 filter
fabric r — — — — — —
Natural Ground
Desior rule' Ove-Nth"for
°p \ 11 m I setil¢nl¢rt 6rurel >k x .� ,�'i�'•
T
Plan View E.E r =`
i Emergenry by, * a r Y min s
__ ^'7 . a .G ' 2' Pass b' below± ,
,,,,, , , 5 _ min r ss settled top of �'£. !? ' is T TIN :rsyrad- x dom
2. to 35', yl `
9
�tuK
Alt. 6rou
fabric min.
Ftgure6.66a PI e.,iov. and cress seccan view' Of & Iemppary sedidi iraP
Rock Aa,AmeRt
5' ►
T It_l/
Class I and It
Rlp-ap
Imrn. NC DOT #5 r ff I
or dfN washed
store, ti fib •� z '- b; ' '.
I
I
r
"4—Cct-off -Ninth
Filter Fabrc
Figure 6.Qa Rock Dam crass Indian Cross Section View
Flow
u 4 i-
---
A yi
Rock Abutmeal
Min. 15 thick
Rock Apron
x
Leval aprt,; r
Figure 6.65E Foil bathes in a sedirnert bee r -I-:e ft:w: u. •. n= r 1. ;:ei evenly ecmas the besin CD reeuce
di rates and :u•f:cmnaa. rasul:irg lr greater ss:'.
18'' min
Snlet zone
.af surfed .rite
F
_ ¢a
Figure 6.65c txarrlpl of porn, battle using silt fence wWl silts Win u l altenlaLrg Wam rA one ica:lu+rg Irinm (Cityor High aeint. NC (ktail.)
8' max. standard strength fabric with wire fence Sediment Fence
6' max. extra strength fabric without wire fence
Steel
post f
- er
wire ties
Wrre 18 24'
fence
Natural
ground
8" down A 4"
forward along
24" the trench
Filter
fabric
Wire
fence
Cross -Section
View
Filter
Steel
fabric Backfill trench
posi
and compact Natural
thoroughly
�ground
' �•`• "4• ` • �pslope
• . min • • '.
,; �,.�►
a:.
24"
•••�•i �•�••'•
.• • , • min
Figure 6.62a Installation detail of a sediment fence
17C
16C
15C
14C
13C
12C
lie
100
90
,
r
I
1
i
I
r
1
r
1
r
1
r
I
r
r
I
I
r
I
1
r
1
r
+
I
I
r
I
I
r
r p
r
a; o
1r
a
c5'
R
VXxN
W'
1
`
-
96.0
0+00 0+50 1+00 1+50
SECTION A
SCALE: HORIZ. 1"=100'
VERT. 1 "=10'
19(
17(
16C
15C
14C
13C
12C
11C
I
"
"
,
,
"
,
I
I
,
r
i
4
r
Q
Cox
O
W
i
+
I
1
I
I
1
I
I
r
I
I
I
r
r
I
I
r
r
I
I
I
r
I
I
I
,
r
WS
106.0
A—L
In
z
w
cn
CD
�
z0
Z
0
O
M
U
(t%7
Elf
ql:�
m
w
Z
a
�
o
U
[if
U
�
C)
z
of
0
o
w
C/3
w
a-
0
N
o
0+00 0+50 1+00 1+50 2+00 2+50 3+00
SECTION B
SCALE: HORIZ. 1"=100'
VERT. 1 "=10'
,. 3.` �!4- i,::,.Y .-
•:.Mi`�ruar�:: L��iiri
.L�
rL '_.ram► -'.ice - '_.�+
'. i_��6'l�P:�A�i:���-.CiYI
•..
: Air {�.°avau'._ __.. _._.�
-11 d: b^dlTdl}e
WfewT'}l"1P�tikJ
Figure 6.17d Tulnpw Channel Liners: Washingtgr Stave Depart iaraS4 fined Channels Fq.re 6.17e Char+;« Ir stAIatioi and 31we ris,alta ion-
�zcawre hal 1. des a,
Ove-bp 6. in g-ode and cross section au/
Dazi9R depri
Lorgitudiml
mchortren_h
eras C-ral Z' m uma Wilk Stakea, 3 5
seedbed
sq.� / Y• LllyC
y owing seedbed p-epronon��'' ^9 me-v[ays'�-'`
lllo
Typ'wl irwrolkil ,i \ .,
sift \ Witt; e199ia11 (ARhVI .J•'.,, �d %' i..<
'. Fe �•
'f1 , bl¢nkers or ,art '
tt�-remforcum¢rt
a 2.5'
Trte^m rten•cho-;k alai LmgrNdin¢�anchor Tznch r< intervds
S rollm andtimimmeMsachrebcekgsidt anchor
nchor cthraennncehl r Zncihxerckslat
t
^dare soilmidseen r.
smiling bl nhet,,•s m ••
'_.mporan c
p NaiE:
i t Checu sots to oe ng Wm per
manufacturers
sp cricf tioni; .
i 2. Stacking or staWinq layost per mawtautures specitcatlws.
4 Saint au^faoe shall!r• amcoth before If he-e:s aEerm at the to"'
placement for preps, soil conte&. s op�, mxha- upsloae of the berm.
Min 2• r
;} 510o1ing Poite•n a1 a ,r / "ri-^� Archer m 6'W nun. T^ench
Pe^ mono: acturers �.�•_ and stopl at t2";nterwis
recommendnt ens -L
oue^ cp
S.apl¢a.crkWs
. .. '• ,,.. max.5 sPacng.
.. bring material down to a level
NOTE5: bo not Intel4knketslme#erg tight-eilaW turn the end order e' and rtopla. ,r ::
I. Deatar ok6tie; exceed 2 fusee require tem ore blank¢*s, mats or titre roils to mry megvloriil[s ; t rvaY.
rn9 P try smiler bners Ta Protect
see.ss soiluntil vegnth becwneseitos,excz. Lime.fas,nice.eseed before it - after ins Plonti
<. brass-I:ned rhemnls Wrth aewgn vebcities exe¢¢ding 6 ftlsec should include Tuff re:rforcemene Far slopes less than ,- IV•-olis of snn.4s rmas, etc. shwld ar_uro�ter installatin,
' nets may to Plac¢d In nar[ze"sd strips.
e-cmrry, mane V-s'laped Riprap Channel
contact a•ga Design top width —
lig
Design depili
Design thickness fir; _
Uesgn thickness i1111 Ili Su6grade excu.allvrl
= lII —
111l�,4+1= ila Fier laver Gravel or fabric
Trapezoidal Riprap Channel
Design top width Rip Rap Channel
`
es'gn depth.
�ll
Figure 6.31a Qinstrucdon sfetailaf rprap charnel apse see:nrte.
II e— II!1—" F=,i`__fr II All .h _i•
Filter layer, gravel
or fabric Parabolic -shaped Riprap Channel
Smoothly Mend do Design top width
wntact area
III l
' •� Design drpth _
Design thickness
Design thlckneb6
ern• � Sulagrade excavat'On
Hiller layer, gravel or fabric
00��� (N CA R p<x���',
��.OFEs3l0��
SEAL
23960
0
Lu
H
O
L
(n
n
O
Z
(N
o
co
�z
DO
-6
„
U)z
¢
o
c
a
3
Y
3
>
w
0
0
w
>
of
o
Icon
In
U
K
J
IZ
O
Z.4- �00
�wNa'
J
IJ �03UN
Z 6) V)NZd•
LLI
0�
Z (Y L.L 00
e
LL_Jtj �0
H
Q
Q_
Q
J
G
Q
Z
J
0
ry
Q
U
2
H
F
O
Z
U
Z
W
E
_Z
�W
I..L
n O
V
W
J
D
W
0
LLJ
CO
LU
W
C
Z
0
(D Q
U
� �
W
W
C C)
H
o
B
Sheet No.:
MP-3 z
U
N �
o
>p
_
a- O
1 1 2 1 3 1 4 1 5
13 1 14
19

Steel Gray Mine
Sediment Trap
Trap /
Skimmer Size Drainage Area
Surface Storage Spillway
Area Volume length
T-1
16'X60'X4
0.6 acres
960ft2
3840ft3
4.0'
T-1A
10'X33'X4'
0.12 acres
330ft2
1320ft3
4.0'
T-2
20'x110'x4'
1.87 acres
2200ft2
8800ft3
6.0'
T-3
26'x100'x3'
2.12 acres
2600ft2
10400ft3
6.0'
T-4
36'x125'x4'
3.5 acres
4500ft2
18000ft3
10.0'
T-5
36'x99'x4'
1.95 acres
3564ft2
14256ft3
9.54

Runoff Calculations for Trap T-1
nacrrinfinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.6
0.5
0.3
Grassland & disturbed Areas
0
0.5
0
Woodlands
0
0.3
0
Roadway ravel
0
0.65
0
Totals U.6
C = 0.3 (coef) / 0.6 (acres) = 0.5
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.5 X 7.06 X 0.6 = 2.118 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.5 X 5.21 X 0.6 = 1.563 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.5 X 8.09 X 0.6 = 2.427 cfs
U.3

P5
"Wav
Sediment Trap Trap T-1
Trapping Effeciency
Drainage Area Acres 0.6
A = 0.01 X (0) 1 2.118 = 0,021-27 X 43560 = 922.6 ft2 Required
Basin Size 16'X60'X4'(minimum)
Ft2 Surface area 960
Ft3 Storage area 3840
Trap to be cleaned at the piont where the basin no longer functions well or is at 50% capacity.

Runoff Calculations for Trap T-1A
rlacrrinfinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.21
0.5
0.105
Grassland & disturbed Areas
0
0.5
0
Woodlands
0
0.3
0
Roadway ravel
0
0.65
0
totals 0.21 club
C = 0.105 (coef) / 0.21 (acres) = 0.5
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.5 X 7.06 X 0.21 = 0.7413 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.5 X 5.21 X 0.21 = 0.54705 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.5 X 8.09 X 0.21 = 0.84945 cfs

Sediment Trap Trap T-1A
Trapping Effeciency
Drainage Area Acres 0.21
A = 0.01 X (Q) 1 0.74 = 0.0074 X 43560 = 322.3 ft2 Required
Basin Size 10'X33'X4'(minimum)
Ft2 Surface area 330
Ft3 Storage area 1320
Trap to be cleaned at the piont where the basin no longer functions well or is at 50% capacity.

Runoff Calculations for Trap T-2
nperrintinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.75
0.5
0.375
Grassland & disturbed Areas
0
0.5
0
Woodlands
1.12
0.3
0.336
Roadway ravel
0
0.65
0
totals 1.bf
C = 0.711 (coef) / 1.87 (acres) = 0.3802139
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.38021 X 7.06 X 1.87 = 5.01966 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.38021 X 5.21 X 1.87 = 3.70431 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.38021 X 8.09 X 1.87 = 5.75199 cfs
U./l"I

`'O
Sediment Trap Trap T-2
Trapping Effeciency
Drainage Area Acres 1.87
A = 0.01 X (Q) 5.02 = 0.0502 X 43560 = 2186.7 ft2 Required
Basin Size 20'X110'X4'(minimum)
Ft2 Surface area 2200
Ft3 Storage area 8800
Trap to be cleaned at the piont where the basin no longer functions well or is at 50% capacity.

Runoff Calculations for Culvert C-1
Description
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.85
0.7
0.595
Grassland & disturbed Areas
0
0.5
0
Woodlands
1.12
0.3
0.336
Roadway ravel
0
0.65
0
Totals 1.97 0.931
C = 0.931 (coef) / 1.97 (acres) = 0.4725888
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.47259 X 7.06 X 1.97 = 6.57286 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.47259 X 5.21 X 1.97 = 4.85051 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.47259 X 8.09 X 1.97 = 7.53179 cfs

Project Description
Worksheet
Circular Channel - C-1
Flow Element
Circular Channel
Method
Manning's Formula
Solve For
Channel Depth
Input Data
Mannings Coefficient
0.010
Slope
0.010000 ft/ft
Diameter
15 in
Discharge
7.53 cfs
Results
Depth
0.92 ft
Flow Area
1.0 ft2
Wetted Perimeter
2.59 ft
Top Width
1.10 ft
Critical Depth
1.09 ft
Percent Full
73.9 %
Critical Slope
0.007304 ft/ft
Velocity
7.74 ft/s
Velocity Head
0.93 ft
Specific Energy
1.86 ft
Froude Number
1.45
Maximum Discharge
9.03 cfs
Discharge Full
8.40 cfs
Slope Full
0.008041 ft/ft
Flow Type
Supercritical
15 in
0.92 A
VA
H:1
N TS

Runoff Calculations for Ditch DB-2
rloerrinfinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.6
0.7
0.42
Grassland & disturbed Areas
0
0.5
0
Woodlands
0
0.3
0
Roadway ravel
0
0.65
0
Totals 0.6 U.42
C = 0.42 (coef) / 0.6 (acres) = 0.7
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.7 X 7.06 X 0.6 = 2.9652 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.7 X 5.21 X 0.6 = 2.1882 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.7 X 8.09 X 0.6 = 3.3978 cfs

Project Description
Worksheet
Trapezoidal Channel - DB-2
Flow Element
Trapezoidal Channel
Method
Manning's Formula
Solve For
Channel Depth
Input Data
Mannings
0.104
Coefficient
Slope
0.020000 ft/ft
Left Side Slope
2.00 V : H
Right Side Slope
2.00 V : H
Bottom Width
2.00 ft
Discharge
3.39 cfs
Results
Depth
0.97 ft
Flow Area
2.4 ftz
Wetted Perimeter
4.17 ft
Top Width
2.97 ft
Critical Depth
0.43 ft
Critical Slope
0.280312 ft/ft
Velocity
1.40 ft/s
Velocity Head
0.03 ft
Specific Energy
1.00 ft
Froude Number
0.27
Flow Type
Subcritical
Determine sheer stress: T= 62.4X 0.97 X 0.02 = 1.21 lb/ft' Permissible Sheer Stress 4.0 Ib/ftz Rip Rap Lining OK
1
0.97 ft
---I-
�- --2.00 ft ---�-
VA
H :2.0
NTS

Runoff Calculations for Ditch DB-2A
r)acrrintinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.24
0.7
0.168
Grassland & disturbed Areas
0
0.5
0
Woodlands
0
0.3
0
Roadway ravel
0
0.65
0
i otais U.Z4 V.loo
C = 0.168 (coef) / 0.24 (acres) = 0.7
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.7 X 7.06 X 0.24 = 1.18608 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.7 X 5.21 X 0.24 = 0.87528 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.7 X 8.09 X 0.24 = 1.35912 cfs

Project Description
Worksheet
Trapezoidal Channel - DB-2A
Flow Element
Trapezoidal Channel
Method
Manning's Formula
Solve For
Channel Depth
Input Data
Mannings Coefficient 0.104
Slope
0.020000 ft/ft
Left Side Slope
2.00 V : H
Right Side Slope
2.00 V : H
Bottom Width
2.00 ft
Discharge
1.36 cfs
Results
Depth
0.55 ft
Flow Area
1.3 ft2
Wetted Perimeter
3.24 ft
Top Width
2.55 ft
Critical Depth
0.24 ft
Critical Slope
0.305306 ft/ft
Velocity
1.08 ft/s
Velocity Head
0.02 ft
Specific Energy
0.57 ft
Froude Number
0.27
Flow Type
Subcritical
Determine sheer stress: T= 62.0 0.55 X 0.02 = 0.69lb/ft2 Permissible Sheer Stress 4.0 Ib/ft2 Rip Rap Lining OK
- - - - --2.0 0 tt -- -- - -
- -i
0.55 It
_f
V:7�
H:2.0
NTS