20211118_ESC

Rockingham Quarry • Mining Permit No. 77-01
Vulcan Construction Materials. LLC
Mining Permit Modification November 18, 2021
Introduction
Vulcan Construction Materials, LLC ("Vulcan") operates the Rockingham Quarry, Permit No.
77-01, in Richmond County, North Carolina. The site is located on the south side of NC
Highway 1117, Galestown Road, where it intersects US 74.
This mining permit modification provides an overview of the existing conditions of the quarry
and a detailed plan for the proposed site improvements. The proposed activities are to be within
existing permitted area for the Overburden Storage Area. The purpose of this modification is to
install additional erosion and sediment control measures in order to utilize more of the Overburden
Storage Area without impacting streams and wetlands (Waters of the US).
Existing Conditions
Property and Permit Boundary
The existing permitted property at Rockingham Quarry consists of 1,249.23 acres of land
owned by Vulcan Lands, Inc. This permitted area is shown on Operations Plan.
Landuse
Within the 1,249.23-acre permitted area, Vulcan currently has approximately 580.6 acres
for quarry related activities including: approximately 58.0 acre for tailings / settling pond
area, 54.9 acres for stockpiles, 158.0 acres for overburden storage area, 63.3 acres for
processing / haul roads area, and 194.2 acres for mine excavation area. The remaining
areas are used for buffers and wildlife enhancement.
Wetlands and Streams
The area included in this permit modification request has been investigated for the presence
of Waters of the U.S. (wetlands and streams). Any such areas have been verified and
delineated using appropriate protocol and their locations surveyed. No impacts to Waters
of the US are proposed by this modification request.
Page 1 of 5

Rockingham Quarry • Mining Permit No. 77-01
Vulcan Construction Materials, LLC
Mining Permit Modification November 18, 2021
Proposed Land Disturbance Boundary
All the property involved in this mine permit modification (approximately 33.0 acres) is within
the existing approved mine permit boundary, as well as already approved for disturbance. The
purpose of this modification is to install erosion and sediment control measures in order to expand
the existing Overburden Storage Area without impacting streams and wetlands (Waters of the US).
All storm water runoff from the proposed modification area will be controlled by existing
Outfall 112-007 and proposed Outfalls 112-012,112-013, and 112-014. Included with this
modification are the design drawings and computations for these outfall structures.
Construction Sequence
1. Clear area without grubbing. Grubbing may be performed in areas where required to install
silt fence.
2. Install silt fence.
3. Commence excavation and filling to establish access road and channels, as per design plans.
4. Install rip rap outfalls, check dams, and channel lining as final grades are achieved.
5. Vegetate disturbed areas as soon as final grades are achieved.
Page 2 of 5

Rockingham Quarry
Sediment Channel Outfall 112-012
At Sta 18+43
Design Computations - Sediment Storage and Stormwater Flow
Sub Basin Sediment Storage Characteristics
NCDEQ Requirements - 3,600 CU FT PER ACRE
Total Drainage Area -
3.00
Acres
Disturbed Drainage Area -
1.00
Acres
Required Sediment Storage -
3,600.0
cu-ft I
Required Sediment Storage -
0.083
ac-ft
Runoff Coefficient, C -
0.4
Travel Length -
816
feet
Time of Concentration Tc -
20.0
min
Inters , i2 -
3.67
in/hr
Intensity, 6r, -
5.50
in/hr
Intensity, i,00 -
6.44
in/hr
Peak Runoff Discharge, Q2 -
4.6
cfs
Peak Runoff Discharge, Q25 -
6.9
cfs
Peak Runoff Discharge, Q,00 -
8.1
cfs
Designed Storage 5,850.0
Spillway Design
Invert Elevation -
199.0 ft
Bottom Width -
10 ft
Total Depth -
2 ft
Freeboard -
1.00 ft
Side Slopes -
5 :1
Capacity with 1' Freeboard -
33.7 cfs
100 Year Storm Flow Depth -
0.4 ft
Average 100 Year Velocity -
2.1 fps
Sediment
Channel
Cell
Channel
Slope
%
Ponded
Ponded
Length
Minimum
Pond
Depth
D, (ft)
Check
Dam
Height
D2 (ft)
Bottom
Channel
Width
(ft)
Channel
Side Slope
(z:1)
100 Yr Flow
Depth Over
Check Dam
(ft)
Volume
(cu-ft)
Total
Volume
(cu-ft)
Total
Volume
(ac ft)
Sta 17+50 to Sta 19+00
0.00
150
3
3
4
2
0.3
5,850.0
5,850.0
0.134
Page 3 of 5

Rockingham Quarry
Sediment Channel Outfall 112-013
At Sta 29+33
Design Computations - Sediment Storage and Stormwater Flow
Sub Basin Sediment Storage Characteristics
NCDEQ Requirements - 3,600 CU FT PER ACRE
Total Drainage Area -
10.80
Acres
Disturbed Drainage Area -
3.00
Acres
Required Sediment Storage -
10,800.0
cu-ft
Required Sediment Storage -
0.248
ac-ft
Runoff Coefficient, C -
0.4
Travel Length -
1051
feet
Time of Concentration Tc -
20.0
min
Intensity, i2 -
3.67
in/hr
Intensity, i2S -
5.50
in/hr
Intensity, i,00 -
6.44
in/hr
Peak Runoff Discharge, Q2 -
16.6
cfs
Peak Runoff Discharge, Q25 -
24.9
cfs
Peak Runoff Discharge, Q,00 -
29.2
cfs
Designed Storage 24,902.0
Spillway Design
Invert Elevation -
199.0 ft
Bottom Width -
12 ft
Total Depth -
2 ft
Freeboard -
1.00 ft
Side Slopes -
5 :1
Capacity with 1' Freeboard -
40.4 cfs
100 Year Storm Flow Depth -
0.8 ft
Average 100 Year Velocity -
3.0 fps
Sediment
Channel
Cell
Channel
Slope
%
Ponded
Ponded
Length
Minimum
Pond
Depth
D, (ft)
Check
Dam
Height
DZ (ft)
Bottom
Channel
Width
(ft)
Channel
Side Slope
(z:1)
100 Yr Flow
Depth Over
Check Dam
(ft)
Volume
(cu ft)
Total
Volume
(cu-ft)
Total
Volume
(ac-ft)
Sta 20+90 to Sta 22+00
5.09
98
0
5
4
2
0.5
2,648.4
2,648.4
0.061
Sta 22+90 to Sta 24+00
5.09
98
0
5
4
2
0.5
2,648.4
5,296.8
0.122
Sta 24+90 to Sta 26+00
5.09
98
0
5
4
2
0.5
2,648.4
7,945.2
0.182
Sta 26+90 to Sta 28+00
5.09
98
0
5
4
2
0.5
2,648.4
10,593.6
0.243
Sta 28+52 to Sta 30+14
0.00
162
5
5
4
2
0.5
11, 340.0
21, 933.6
0.504
Sta 31+00 to Sta 32+10
4.38
110
0
5
4
2
0.5
2,968.4
24,902.0
0.572
Page 4 of 5

Rockingham Quarry
Sediment Channel Outfall 112-014
At Sta 40+00
Design Computations - Sediment Storage and Stormwater Flow
Sub Basin Sediment Storage Characteristics
NCDEQ Requirements - 3,600 CU FT PER ACRE
Total Drainage Area -
13.30
Acres
Disturbed Drainage Area -
4.00
Acres
Required Sediment Storage -
14,400.0
cu-ft I
Required Sediment Storage -
0.331
ac-ft
Runoff Coefficient, C -
0.4
Travel Length -
2033
feet
Time of Concentration Tc -
20.0
min
Intensity, iz -
3.67
in/hr
Intensity, i25 -
5.50
in/hr
Intensity, i,00 -
6.44
in/hr
Peak Runoff Discharge, Qz -
20.5
cfs
Peak Runoff Dischar e, Qzs -
30.7
cfs
Peak Runoff Discharge, Q,co -
36.0
cfs
Designed Storage 46,362.9
Spillway Design
Invert Elevation -
185.5 ft
Bottom Width -
12 ft
Total Depth -
2 ft
Freeboard -
1.00 ft
Side Slopes -
5 :1
Capacity with 1' Freeboard -
40.4 cfs
100 Year Storm Flow Depth -
0.9 ft
Average 100 Year Velocity -
3.2 fps
Sediment
Channel
Cell
Channel
Slope
%
Ponded
Ponded
Length
Minimum
Pond
Depth
D, (ft)
Check
Dam
Height
D2 (ft)
Bottom
Channel
Width
(ft)
Channel
Side Slope
(z:1)
100 Yr Flow
Depth Over
Check Dam
(ft)
Volume
(cu-ft)
Total
Volume
(cu-ft)
Total
Volume
(ac-ft)
Sta 34+00 to Sta 35+00
4.98
100
0
5
4
2
0.6
2,954.3
2,954.3
0.068
Sta 35+00 to Sta 36+00
4.98
100
0
5
4
2
0.6
2,954.3
5,908.6
0.136
Sta 36+00 to Sta 37+00
4.98
100
0
5
4
2
0.6
2,954.3
8,862.9
0.203
Sta 38+77 to Sta 43+77
0.00
500
5
5
5
2
0.6
37,500.0
46,362.9
1.064
Page 5 of 5