Appendix B.1_Response_DEMLR_comments

Piedmont Lithium Carolinas,Inc. I Response to Additional Information Request(dated January 14,2022)
Appendix B: Response to Mooresville Regional Office Comments
B.1 Attachment 1 — Concentrator Plant Drainage
Calculations

This page intentionally left blank.

Drainage
Calculations for
Concentrate
Operations

Drainage Calculations for Concentrate Operations,Piedmont Lithium Carolinas,Inc.
Gaston County,North Carolina
►►' \► �� May2022
Table of Contents
Waste Rock Pile
Plant Pad Area
Emulsion Storage and Bulk Truck Parking Area
Topsoil Storage Pile
Mine Pit Area
Haul Roads
NOAA Atlas 14 Rainfall Data; Web Soil Survey National Cooperative Soil Survey for Drainage
Calculations
MARSHALL MILLER&ASSOCIATES,INC.

Drainage Calculations for Concentrate Operations,Piedmont Lithium Carolinas,Inc.
Gaston County,North Carolina
►►' ►► May2022
The Erosion and Sediment Control (ESC) structures for the Concentrate Operations site will be
constructed prior to disturbance within the applicable drainage area and have been designed on
maximum flow and disturbance for activities within the applicable drainage area. The Sediment
Basins, Skimmer Basins, Sediment Traps, Ditches, and Culverts are designed on a 25-year, 24-hour
storm event. The In-Stream Culverts and Sediment Basin No. 18 are designed on a 100-year, 24-
hour storm event. All sediment structures have a design height of 15 feet or less and a maximum
impoundment capacity of less than 50 acre-feet.
Temporary diversions will be constructed. These diversions will intercept surface flow to prevent
it from leaving the area.
The Pit Dewatering Ponds have been over-designed to provide storage for the combination of the
maximum expected pit dewatering activities (-2,300 gallons per minute) and a 100-year, 24-hour
storm event. The Pit Dewatering Ponds are designed to store approximately 1,000,000 gallons of
water from the pit area as needed during operations. The Pit Dewatering Pond spillways are
designed to discharge 100 cubic feet per second, which exceeds the combination of the 100-year,
24-hour storm event flow of 44.01 cubic feet per second and 2,300 gallons per minute (6.15 cubic
feet per second) pumped flow. The Pit Dewatering Ponds are designed with a level bottom and
an earthen dam with rock spillway to capture and retain flow, allowing time for sediment to
settle and water to discharge only from the top of the structure at the spillway location.
ESC structures will be cleaned out at 50% capacity and are designed with 1 foot of freeboard per
regulations. The Sediment Basins and Sediment Traps have been designed to meet a required
surface area of 435 square feet per calculated cubic feet per second of Q25 peak flow, as well as
storage volume of 3600 cubic feet per disturbed acre. The Skimmer Basins have been designed to
meet a required surface area of 325 square feet per calculated cubic feet per second of Q25 peak
flow, as well as storage volume of 1800 cubic feet per disturbed acre.
A Summary of the associated drainage area, design storm, calculated flow, required surface area,
required volume, provided surface area, and provided volume for each ESC structure is included
on the Concentrate Operations— Erosion Control Details. Additional details can be found on the
Detail Sheets.
MARSHALL MILLER&ASSOCIATES INC.

Drainage Calculations for Concentrate Operations,Piedmont Lithium Carolinas,Inc.
Gaston County,North Carolina
►►' ►► May2022
Waste Rock Pile
• Waste Rock Pile— Pre-Construction Sedcad 4 Calculations
• Waste Rock Pile—Operational - Phase 1 Sedcad 4 Calculations
• Waste Rock Pile—Operational Sedcad 4 Calculations
MARSHALL MILLER&ASSOCIATES INC.

SEDCAD 4 for Windows
­_r oo i ooa-,)nln Pe io I Crh....h
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Storm water Management Plan
Waste Rock Pile (Pre-Construction Phase)
Storm Event: 25 -Year/24-Hour
MM&A Project No. PLIT109
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename:DAB thru DA34 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
(`n ,An he 1ooA-in iA Por i. 1 Crh...eh
General Information
Storm Information:
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename. DA8 thru DA34 preconstruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
(mm�in hl ioap.Anin D-1, I -Z,K-k•
Structure Networking:
Stru (flows Stru Musk. K
Type Stru
into) # (hrs) Musk. X Description
Null #1 =_> #29 0.000 0.000 ST100
Null #2 =_> #29 0.000 0.000 ST101
Null #3 =_> #29 0.000 0.000 ST102
Null #4 =_> #29 0.000 0.000 ST103
Null #5 =_> #29 0.000 0.000 ST104
Null #6 =_> #29 0.000 0.000 SB-10
Null #7 =_> #29 0.000 0.000 SB-9
Null #8 =_> #29 0.000 0.000 SB-8
Null #9 =_> #29 0.000 0.000 ST105
Null #10 =_> #29 0.000 0.000 SK26
Null #11 =_> #29 0.000 0.000 SB-7
Null #12 =_> #29 0.000 0.000 SB-1
Null #13 =_> #29 0.000 0.000 SK27
Null #14 =_> #29 0.000 0.000 SB-2
Null #15 =_> #29 0.000 0.000 SK28
Null #16 =_> #29 0.000 0.000 SK29
Null #17 =_> #18 0.000 0.000 SB-3
Null #18 =_> #29 0.000 0.000 SB-3
Null #19 =_> #29 0.000 0.000 SB-6
Null #20 =_> #29 0.000 0.000 ST106
Null #21 =_> #29 0.000 0.000 ST107
Null #22 ==> #29 0.000 0.000 ST108
Null #23 =_> #29 0.000 0.000 ST109
Null #24 =_> #29 0.000 0.000 se-5 .
Null #25 =_> #29 0.000 0.000 SB-4
Null #26 =_> #25 0.000 0.000 SBA
Null #27 =_> #29 0.000 0.000 SK30
Null #28 =_> #29 0.000 0.000 ST110
Null #29 =_> End 0.000 0.000 DISCHARGE OFF SITE
#28
Null
#27
Null
#26
Null
#25
Null
Filename.DA8 thru DA34 preconstruct_25 YR.sc4 Prinked 03-19-2022

SEDCAD 4 for Windows
4
e #24
Null
#23
NO
47 #22
Null
4 #21
Null
#20
Null
4 #19
NO
#17
NO
#18
Null
4 #16
Null
#15
Null
#14
Null
913
Null
#12
Null
#Il
Null
#10
Null
#9
Null
#8
Null
4 #7
NO
#6
Null
#5
Null
#4
Null
#3
Null
Filename: DA8 thru DA34 preconstruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
r.,.,,m; K*icon-,)non D—i, i
I�fl #z
NO
#1
Null
#19
Null
Filename:DA8 thru DA34 preconstruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
t3
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#28 0.390 0.390 1.69 0.15
#27 2.330 2.330 10.09 0.90
#26 3.790 3.790 16.42 1.46
#25 14.410 18.200 56.33 5.92
#24 3.160 3.160 13.69 1.22
#23 0.750 0.750 3.25 0.29
#22 0.740 0.740 3.21 0.29
#21 0.360 0.360 1.56 0.14
#20 0.990 0.990 4.29 0.38
#19 12.940 12.940 38.20 4.02
#17 1.560 1.560 6.76 0.60
#18 18.770 20.330 59.48 6.44
#16 4.920 4.920 15.10 1.52
#15 4.020 4.020 17.42 1.55
#14 17.610 17.610 47.25 5.43
#13 9.520 9.520 29.34 2.95
#12 27.500 27.500 76.61 8.50
#11 12.340 12.340 36.14 3.83
#10 4.290 4.290 18.59 1.66
#9 0.940 0.940 4.07 0.36
#8 4.420 4.420 14.03 1.39
#7 11.870 11.870 35.26 3.69
+ #6 19.170 19.170 60.84 6.02
#5 0.590 0.590 2.56 0.23
#4 0.770 0.770 3.34 0.30
#3 0.690 0.690 2.99 0.27
#2 0.990 0.990 4.29 0.38
#1 0.620 0.620 2.69 0.24
#29 0.000 180.450 543.19 58.07
Filename: DA8 thru DA34 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
I'n--.10 1QOA_9MA 0-1. 1 Q,6,-.
7
Structure Detail;
Structure #25Null
ST210
Structure #27(Nulls
SK30
Structure #2 ( l
SB-4
Structure #25(Nulls
SB-4
Structure #24�Null�
SB-5
Structure #23(Nulls
57209
Structure #22 (Nulls
57208
Structure #21_(Nulo
57207
Structure #20 (Nulls
ST206
Structure #19(Nulls
SB-6
Structure #17(Nulls
SB-3
Structure #18(Nulls
SB-3
Structure #16 Null
SK29
Filenames DA8 thru DA34 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
f`-l. kt 108A_91tIA 0-1. 1 -z'K K p
V
Structure #15(NuII
SK28
Structure #14(Nulls
SB-2
Structure-#13(Nulls
SK27
, ructure #12(Null)
SB-1
Structure #11 (Nulls
SS-7
Structure #10(Nulls
SK26
Structure #9(Nulls
ST205
Structure #6 (Null)
SB-8
Structure #7(Null
SB-9
Structure #6 (Nulls
SB-10
Structure #5(Nulls
ST204
Structure #4(Nulls
ST203
Structure #3 LALOIJI
ST202
Structure #2(Nulls
ST201
Filename:DAB thru DA34 preconslruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
8
Structure #1 C&
ST200
Structure #29 Null
DISCHARGE OFF SITE
Filename:DA8 thru DA34 preconstruct_25 YR sc4 Printed 03-18-2022

SEDCAD 4 for Windows
10
Subwatershed Hydrology Detail:
Time of Peak Runoff
Stru SW5 SWS Area Conc Musk K Musk X Curve UtiS Discharge Volume
# # (ac) (hrs) (hrs) Number (cfs) (ac-R)
#28 1 0.390 0.018 0.000 0.000 86.000 M 1.69 0.150
E 0.390 1.69 0.150
#27 1 2.330 0.055 0.000 0.000 86.000 M 10.09 0.900
Fr 2.330 10.09 0.900
#26 1 3.790 0.084 0.000 0.000 86.000 M 16.42 1.464
3.790 16.42 1.464
#25 1 14.410 0.261 0.000 0.000 86.000 M 41.44 4.458
18.200 56.33 5.922
#24 1 3.160 0.063 0.000 0.000 86.000 M 13.69 1.220
E 3.160 13.69 1.220
#23 1 0.750 0.038 0.000 0.000 86.000 M 3.25 0.289
0.750 3.25 0.289
#22 1 0.740 0.028 0.000 0.000 86.000 M 3.21 0.285
0.740 3.21 0.285
#21 1 0.360 0.019 0.000 0.000 86.000 M 1.56 0.138
0.360 1.56 0.138
#20 1 0.990 0.051 0.000 0.000 86.000 M 4.29 0.382
0.990 4.29 0.382
#19 1 12.940 0.239 0.000 0.000 86.000 M- 38.20 4.023
12.940 38.20 4.023
#17 1 1.560 0.064 0.000 0.000 86.000 M 6.76 0.602
1.560 6.76 0.602
#18 1 18.770 0.241 0.000 0.000 86.000 M 55.28 5.833
20.330 59.48 6.435
#16 1 4.920 0.196 0.000 0.000 86.000 M 15.10 1.523
4.920 15.10 1.523
#15 1 4.020 0.070 0.000 0.000 86.000 M 17.42 1.552
4.020 17.42 1.552
#14 1 17.610 0.365 0.000 0.000 86.000 M 47.25 5.434�
E 17.610 47.25 5.434
Filename:DA8 thru DA34 preconstruct_25 YR sc4 Printed 03-18-2022

SEDCAD 4 for Windows
r--hf 10Ok.7A1A Oo Ais I
11
Time of Peak Runoff
Stru SWS SWS Area Conc Musk K Musk X Curve UFO Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#13 1 9.520 0.193 0.000 0.000 86.000 M 29.34 2.955
9.520 29.34 2.955
#12 1 27.500 0.311 0.000 0.000 86.000 M 76.61 8.498
" 27.500 76.61 6.498
#11 1 12.340 0.246 0.000 0.000 86.000 M 36.14 3.834
12.340 36.14 3.834
#10 1 4.290 0.049 0.000 0.000 86.000 M 18.59 1.657
4.290 18.59 1.657
#9 1 0.940 0.039 0.000 0.000 86.000 M 4.07 0.363
0.940 4.07 0.363
#8 1 4.420 0.157 0.000 0.000 86.000 M 14.03 1.388
4.420 14.03 1.388
#7 1 11.870 0.233 0.000 0.000 86.000 M 35.26 3.691
11.870 35.26 3.691
#6 1 19.170 0.133 0.000 0.000 86.000 M 60.84 6.021
F, 19.170 60.84 6.021
#5 1 0.590 0.020 0.000 0.000 86.000 M 2.56 0.227
F, 0.590 2.56 0.227
#4 1 0.770 0.029 0.000 0.000 86.000 M 3.34 0.297
F, 0.770 3.34 0.297
#3 1 0.690 0.014 0.000 0.000 86.000 M 2.99 0.266
0.690 2.99 0.266
#2 1 0.990 0.026 0.000 0.000 86.000 M 4.29 0.382
F, 0.990 4.29 0.382
#1 1 0.620 0.043 0.000 0.000 86.000 M 2.69 0.239
0.620 2.69 0.239
#29 180.450 543.19 58.071
Subwatershed Time of Concentration Details:
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ff) (ft) (fps) Time(hrs)
#1 1 7. Paved area and small upland 21.00 22.47 107.00 9.220 0.003
gullies
Filename:DA8 thru DA34 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
!`nn.irinht 1QQN 7111 f1 P-1. I C..M.rh
12
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(°lo) ( ) (ft) (fps) Time(hrs)
8. Large gullies,diversions, and low 0.50 0.71 143.00 2.120 0.018
flowing streams
5. Nearly bare and untitled,and 50.00 6.00 12.00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.07 76.00 0.940 0.022
flowing streams
#1 1 Time of Concentration: 0.043
#2 1 7. Paved area and small upland 22.00 28.60 130.00 9.440 0.003
gullies
8. Large gullies,diversions,and low 3.30 6.13 186.00 5.440 0.009
flowing streams
8. Large gullies,diversions,and low 0.10 0.05 50.00 0.940 0.014
flowing streams
#2 1 Time of Concentration: 0.026
#3 1 7. Paved area and small upland 21.00 7.56 36.00 9.220 0.001
gullies •-
8. Large gullies,diversions,and low flowing streams 18.00 45.72 254.00 12.720 0.005
5. Nearly bare and untilled, and 50.00 2.50 5.00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.03 29.99 0.940 0.008
flowing streams
#3 1 Time of Concentration: 0.014
#4 1 7• Paved area and small upland 12.20 15.37 126.00 7.030 0.004
gullies
8. Large gullies,diversions,and low 0.50 0.56 113.00 2.120 0.014
flowing streams
5. Nearly bare and untitled, and 50.00 2.50 5.00 7.070 0.000
alluvial valley fans - T
8. Large gullies,diversions,and low 0.10 0.04 40.00 0.940 0.011
flowing streams
#4 1 Time of Concentration: 0.029
#5 1 7. Paved area and small upland 7.00 3.57 51.00 5.320 0.002
gullies
8. Large gullies,diversions,and low 1.20 0.76 64.00 3.280 0.005
flowing streams
S. Nearly bare and untilled,and 50.00 4.00 8.00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions, and low 0.10 0.04 45.00 0.940 0.013
flowing streams
#5 1 Time of Concentration: 0.020
#6 1 7. Paved area and small upland 4.40 34.89 793.00 4.220 . 0.052
gullies
8. Large gullies,diversions,and low 1.80 3.60 200.00 4.020 0.013
flowing streams
B. Large gullies,diversions,and low 3.50 19.63 561.00 5.610 0.027
flowing streams
B. Large gullies,diversions,and low 50.00 23.50 47.00 21.21p 0.000
flowing streams
Filename-DA8 thru DA34 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
13
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope{%) Time(hrs)
(ft) (ft) (Fps)
8. Large gullies,diversions,and low 0.50 0.15 31.00 2.120 0.004
flowing streams
8.Large gullies,diversions,and low 0.50 1.42 284.00 2.120 0.037
flowing streams
#6 1 Time of Concentration: 0.133
#7 1 7.Paved area and small upland 1.60 18.35 1,147.00 2.540 0.125
gullies
8.Large gullies,diversions,and low 0.50 0.44 89.00 2.120 0.011
flawing streams
B. Large gullies,diversions,and law flowing streams 50.00 21.00 42.00 21.210 0.000
8. Large gullies,diversions,and low 0.50 1.44 289.00 2.120 0.037
flowing streams
B.Large gullies,diversions,and low 0.10 0.20 206.00 0.940 0.060
flowing streams
#7 1 Time of Concentration: 0.233
#8 1 7. Paved area and small upland 1.64 2.26 138.00 2.570 0.014
gullies
8.Large gullies,diversions,and low 1.52 14.78 973.00 3.690 0.073
flowing streams
8. Large gullies,diversions,and low 0.10 0.23 238.00 0.940 0.070
flowing streams
#8 1 Time of Concentration: 0.157
#9 1 5. Nearly bare and untilled,and 50.00 15.50 31.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 2.50 11.15 446.00 4.740 0.026
flowing streams
8. Large gullies,diversions,and low 50.00 2.50 5.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.04 43.00 0.940 0.012
flowing streams
#9 1 Time of Concentration: 0.039
#10 1 7. Paved area and small upland 1.80 3.07 171.00 2.700 0.017
gullies
8. Large gullies,diversions,and low 5.10 31.16 611.00 6.770 0.025
flowing streams
8. Large gullies,diversions,and low 0.50 0.26 54.00 2.120 0.007
flowing streams
#10 1 Time of Concentration: 0.049
#11 1 7. Paved area and small upland 3.00 33.30 1,110.00 3.480 0.088
gullies
8.Large gullies,diversions,and low 0.50 3.16 633.00 2.120 0.082
flowing streams
8. Large gullies,diversions,and low 0.10 0.26 259.99 0.940 0.076
flowing streams
#11 1 Time of Concentration: 0.246
#12 1 7. Paved area and small upland 3.80 69.54 1,830.00 3.920 0.129
gullies
8. Large gullies,diversions,and low 0.30 1.89 630.00 1.640 0.106
flowing streams
Filename:DA8 thru DA34 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
(`nn„rinh 100A_'lA7A tla..,nle 1 Cr h,.roh
14
Stru SWS Land Flow Condition Slope(%) Vert.Dist. Horiz. Dist. Velocity Time(hrs)
# # (ft) (ft) (FPS)
8. Large gullies,diversions,and low 0.10 0.26 259.99 0.940 0.076
flowing streams
#12 1 Time of Concentration: 0.311
#13 1 7. Paved area and small upland 7.70 31.72 412.00 5,580 0.020
gullies
8. Large gullies,diversions,and low 0.50 5.97 1,195.00 2.120 0.156
flowing streams
5. Nearly bare and untilled,and 50.00 7.00 14.00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.06 59.99 0.940 0.017
flowing streams
#13 1 Time of Concentration: 0.193
#14 1 7. Paved area and small upland 2.12 16.00 755.00 2.930 0.071
gullies
8. Large gullies,diversions,and low 0.50 7.75 1,551.00 2.120 0.203
flowing streams
8. Large gullies,diversions, and low 50.00 5.00 10.00 21,210 0.000
flowing streams
8. Large gullies,diversions, and low 0,10 0.31 310.00 0.940 0.091
flowing streams
#14 1 Time of Concentration: 0.365
#15 1 7. Paved area and small upland 9,10 38.31 421.00 6.070 0.019
gullies
8. Large gullies,diversions,and low 0.50 1.41 282.00 2.120 0.036
flowing streams
B. Large gullies,diversions,and low 50.00 7.00 14.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0,10 0.05 52.00 0.940 0.015
flowing streams
#13 1 Time of Concentration: 0.070
#16 1 7. Paved area and small upland 7.40 38.11 515.00 5.470 0.026
gullies
8. Large gullies,diversions,and low 0.50 3.69 739.00 2,120 0.096
flowing streams
8. Large gullies,diversions,and low 1,00 3.55 355.00 3.000 0.032
flowing streams
8. Large gullies,diversions,and low 0.10 0.14 143.00 0.940 0.042
flowing streams
#16 1 Time of Concentration: 0.196
#17 1 7. Paved area and small upland 24.00 10.56 44.00 9,860 0.001
gullies
8. Large gullies,diversions,and low 0.50 2.40 481.00 2.120 0.063
flowing streams
#17 1 Time of Concentration: 0.064
#18 1 7. Paved area and small upland 7.50 47.32 631.00 5.510 0.031
gullies
8. Large gullies,diversions,and low 0.50 5.46 1,092,00 2,120 0.143
flowing streams
8. Large gullies,diversions,and low 50.00 21.50 43.00 21.210 0.000
flowing streams
Filename.DA8 thru DA34 preconstruct_25 YR_sc4 Printed 03-18-2022

SEDCAD 4 for Windows
15
Stru SWS Land Flow Condition Slope(%) Vert. Dist, Horiz. Dist. Velocity Time(hrs)
# # (ft) (ft) (fps)
B. Large gullies,diversions,and low 0.10 0.22 228.00 0.940 0.067
flowing streams
#18 1 Time of Concentration: 0.241
#19 1 7. Paved area and small upland 3.06 29.89 976.79 3.520 0.077
gullies
8. Large gullies,diversions,and low 0.40 3.35 837.49 1.890 0.123
flowing streams
8. Large gullies,diversions, and low 2.40 1.99 82.91 4.640 0.004
flowing streams
8. Large gullies,diversions, and law 0.10 0.12 119.99 0.940 0.035
flowing streams
#19 1 Time of Concentration: - 0.239
#20 1 5. Nearly bare and untilled,and 50.00 11.50 23.00 '7.070 0.000
alluvial valley fans
8. Large gullies,diversions, and low 4.60 38,64 840.00 6,430 0.036
flowing streams
8. Large gullies,diversions, and low 50.00 3.50 7.00 21.210 0.000
flowing streams
8. Large gullies,diversions, and low 0.10 0.05 53.00 0.940 0.015
flowing streams
#20 1 Time of Concentration: 0.051
#21 1 5. Nearly bare and untitled,and 50.00 11.50 23,00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions, and law 2.80 3.61 129.00 5.010 0.007
flowing streams
8. Large gullies,diversions, and low 0.10 0.04 43.00 0.940 0.012
flowing streams
#21 1 Time of Concentration: 0.019
#22 1 7• Paved area and small upland 3.20 4.92 154.00 3.600 0.011
gullies
B. Large gullies,diversions, and low 2.50 3.27 131.00 4,740 0.007
flowing streams
5. Nearly bare and untilled, and 50.00 3.00 6.00 7.070 0.000
alluvial valley fans
B. Large gullies,diversions, and low 0.10 0.03 35.00 0.940 0.010
flowing streams
#22 1 Time of Concentration: 0.028
#23 1 7. Paved area and small upland 3.20 4.92, 154.00 3.600 0.011
gullies
8. Large gullies,diversions, and low 0.70 1.12 160.00 2.500 0.017
flowing streams
8. Large gullies,diversions, and low 0.10 0.03 37.00 0.940 0.010
flowing streams
#23 1 Time of Concentration: 0.038
#24 1 7. Paved area and small upland 2.30 6.11 266.00 3,050 0.024
gullies
8. Large gullies,diversions, and low 2.50 2.20 88.00 4.740 0.005
flowing streams
B. Large gullies,diversions, and low 0.10 0.11 117.00 0.940 0.034
flowing streams
Filename:DA8 thru DA34 preconstruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
f'.s n.winM 10°p.7(17 f1 Pe.++win i Cn h.nh
16
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(°!o) Time(hrs)
(ft) (ft) (fps)
#24 1 Time of Concentration: 0.063
#25 1 7. Paved area and small upland 5.90 31.44 533.00 4.880 0.030
gullies
8.Large gullies,diversions,and low 2.40 38.56 1,607.00 4.640 0.096
flowing streams
8. Large gullies,diversions,and low flowing streams 0,10 0.45 457.00 0.940 0.135
#25 1 Time of Concentration: 0.261
#26 1 7. Paved area and small upland 1.40 3.09 221.00 2.380 0.025
gullies
8. Large gullies,diversions,and low 3.60 35.09 975.00 5.690 0.047
flowing streams
8. Large gullies,diversions,and low 50.00 25.50 51.00 21.210 0.000
flowing streams
B. Large gullies,diversions,and low 0.10 0.04 43.00 0.940 0.012
flowing streams
#26 1 Time of Concentration: 0.084
#27 1 5. Nearly bare and untilled,and 50.00 12.00 24.00 7.070 0.000
alluvial valley fans
B. Large gullies,diversions,and low 3.50 27.12 775.00 5.610 0.038
flowing streams
B. Large gullies,diversions,and low 0.10 0.06 60.00 0.940 0.017
Flowing streams
#27 1 Time of Concentration: 0.055
#28 1 B. Large gullies,diversions,and low 12.50 30.87 247.00 10.600 0.006
flowing streams
8. Large gullies,diversions,and law -0.10 0.04 43.00 0.940 0.012
flowing streams
#28 1 Time of Concentration: 0.018
Filename: DA8 thru DA34 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
1
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Stormwater Management Plan
Operational - Phase 1 Waste Rock Pile
DrainageArea(s): Z, 2, 3, 3A, 4, 4A, 4B, 5, 6, 6A, 7, 8, 9, 10, 111
12, 13, 14, Z5, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 26Aand
27
Storm Event; 25 -Year/ 24-Hour
MM&A Project No, PLIT109
January 2021
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

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f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #1 =_> #3 0.000 0.000 DA-1
Null #2 =_> #28 0.000 0.000 DA-2
Null #3 =_> #29 0.000 0.000 DA-3
Null #4 =_> #2 0.000 0.000 DA-4
Null #5 =_> #6 0.000 0.000 DA-5
Null #6 =_> #3 0.000 0.000 DA-6
Null #7 =_> #8 0.000 0.000 DA-7
Null #8 =_> #30 0.000 0.000 DA-8
Null #10 =_> #12 0.000 0.000 DA-10
Null #11 =_> #10 0.000 0.000 DA-11
Null #12 =_> #31 0.000 0.000 DA-12
Null #13 =_> #8 0.000 0.000 DA-13
Null #14 =_> #10 0.000 0.000 DA-14
Null #15 =_> #12 0.000 0.000 DA-15
Null #16 =_> #17 0.000 0.000 DA-16
Null #17 =_> #32 0.000 0.000 DA-17
Null #18 =_> #33 0.000 0.000 DA-18
Null #19 =_> #18 0.000 0.000 DA-19
Null #20 =_> #21 0.000 0.000 DA-20
Null #21 =_> #34 0.000 0.000 DA-21
Null #22 =_> #23 0.000 0.000 DA-22
Null #23 =_> #35 0.000 0.000 DA-23
Null #24 =_> #36 0.000 0.000 DA-24
Null #25 =_> #24 0.000 0.000 DA-25
Null #26 =_> #27 0.000 0.000 DA-26
Null #27 =_> #37 0.000 0.000 DA-27
Null #28 =_> #38 0.000 0.000 SED BASIN 1 OUTLET
Null #29 =_> #38 0.000 0.000 SED BASIN 2 OUTLET
Null #30 =_> #38 0.000 0.000 SED BASIN 3 OUTLET
Null #31 =_> #38 0.000 0.000 SED BASIN 4 OUTLET
Null #32 =_> #38 0.000 0.000 SED BASIN 5 OUTLET
Null #33 =_> #38 0.000 0.000 SED BASIN 6 OUTLET
Null #34 =_> #38 0.000 0.000 SED BASIN 7 OUTLET
Null #35 =_> #38 0.000 0.000 SED BASIN 8 OUTLET
Null #36 =_> #38 0.000 0.000 SED BASIN 9 OUTLET
Null #37 =_> #38 0.000 0.000 SED BASIN 10 OUTLET
Null #38 =_> End 0.000 0.000 NULL
Null #39 =_> #7 0.000 0.000 DA-6a
Null #40 =_> #7 0.000 0.000 DA-9
Null #41 =_> #3 0.000 0.000 DA-3a
Filename:PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
4
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #42 =_> #2 0.000 0.000 DA-4a
Null #43 =_> #27 0.000 0.000 DA-26a
Null #44 =_> #2 0.000 0.000 DA-4b
#43
Null
#26
Null
#27
Null
#37
Null
#25
Null
#24
Null
#36
Null
#22
Null
#23
Null
#35
Null
#20
Null
#21
Null
#34
Null
#19
Null
#18
Null
#33
Null
#16
Null
#17
Null
#32
Null
Filename:PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crh�e��h
5
#15
Null
#14
Null
#11
Null
#10
Null
#12
Null
#31
Null
#13
Null
#40
Null
#39
Null
#7
Null
#8
Null
#30
Null
#41
Null
#5
Null
#6
Null
#1
Null
#3
Null
#29
Null
#44
Null
#42
Null
#4
Null
#2
Null
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
6
#28
Null
#38
Null
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
7
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#43 0.440 0.440 1.91 0.17
#26 12.360 12.360 53.55 4.77
#27 1.700 14.500 62.82 5.60
#37 0.000 14.500 62.82 5.60
#25 4.020 4.020 17.42 1.55
#24 7.250 11.270 48.82 4.35
#36 0.000 11.270 48.82 4.35
#22 8.610 8.610 37.30 3.33
#23 2.790 11.400 49.39 4.40
#35 0.000 11.400 49.39 4.40
#20 14.660 14.660 63.51 5.66
#21 1.090 15.750 68.23 6.08
#34 0.000 15.750 68.23 6.08
#19 5.730 5.730 24.82 2.21
#18 1.090 6.820 29.55 2.63
#33 0.000 6.820 29.55 2.63
#16 3.120 3.120 13.52 1.20
#17 0.800 3.920 16.98 1.51
#32 0.000 3.920 16.98 1.51
#15 6.450 6.450 27.94 2.49
#14 19.820 19.820 85.86 7.65
#11 0.640 0.640 2.77 0.25
#10 0.650 21.110 91.45 8.15
#12 2.410 29.970 129.84 11.57
#31 0.000 29.970 129.84 11.57
#13 9.390 9.390 40.68 3.63
#40 1.900 1.900 8.23 0.73
#39 3.780 3.780 16.38 1.46
#7 0.730 6.410 27.77 2.47
#8 2.480 18.280 79.19 7.06
#30 0.000 18.280 79.19 7.06
#41 0.570 0.570 2.47 0.22
#5 17.130 17.130 74.21 6.62
#6 0.350 17.480 75.73 6.75
#1 2.160 2.160 9.36 0.83
#3 1.800 22.010 95.35 8.50
#29 0.000 22.010 95.35 8.50
Filename:PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
(`nnvrinh4 IGOP_9(19(1 Pamela I Rrhmmh
8
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#44 2.170 2.170 9.40 0.84
#42 2.000 2.000 8.66 0.77
#4 12.280 12.280 53.20 4.74
#2 2.150 18.600 80.58 7.18
#28 0.000 18.600 80.58 7.18
#38 0.000 152.520 660.74 58.89
Filename:PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crheh
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Structure Detail;
Structure #43
DA 26a
Structure #26(Null)
DA 26
Structure #27
DA-27
Structure #37
SED BASIN 10 OUTLET
Structure #25
DA-25
Structure #24
DA-24
Structure #36(Null1
SED BASIN 9 OUTLET
Structure #22
DA 22
Structure #23
DA 23
Structure #35
SED BASIN 8 OUTLET
Structure #20
DA-20
Structure #21
DA-21
Structure #34
SED BASIN 7 OUTLET
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
10
Structure #19
DA-19
Structure #18(Null1
DA-18
Structure #33
SED BASIN 6 OUTLET
Structure #16
DA-16
Structure #17
DA-17
Structure #32
SED BASIN 5 OUTLET
Structure #15
DA-15
Structure #14
DA-14
Structure #11 (Null1
DA-11
Structure #10(Null1
DA-10
Structure #12 (Null1
DA-12
Structure #31 (Null1
SED BASIN 4 OUTLET
Structure #13
DA-13
Structure #40
DA-9
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crheh
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Structure #39
DA-6a
Structure #7(Nulls
DA-7
Structure #8(Nulls
DA-8
Structure #30
SED BASIN 3 OUTLET
Structure #41
DA-3a
Structure #5
DA-5
Structure #6
DA-6
Structure #1
DA-1
Structure #3 (Nulls
DA 3
Structure #29
SED BASIN 2 OUTLET
Structure #44
DA-4b
Structure #42 (Null1
DA-4a
Structure #4
DA-4
Structure #2
DA-2
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
(`nn.irinh4 1QQR_goo fl iD—il I Crh,—h
12
Structure #28
SED BASIN I OUTLET
Structure #38 (Nulls
NULL
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP-9(19(1 Pamela I Q,h,e h
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Subwatershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) (hrs) Number (cfs) (ac-ft
#43 1 0.440 0.015 0.000 0.000 86.000 M 1.91 0.169
0.440 1.91 0.169
#26 1 12.360 0.047 0.000 0.000 86.000 M 53.55 4.773
12.360 53.55 4.773
#27 1 1.700 0.029 0.000 0.000 86.000 M 7.36 0.656
14.500 62.82 5.599
#37 14.500 62.82 5.599
#25 1 4.020 0.030 0.000 0.000 86.000 M 17.42 1.552
4.020 17.42 1.552
#24 1 7.250 0.104 0.000 0.000 86.000 M 31.41 2.800
E 11.270 48.82 4.352
#36 L, 11.270 48.82 4.352
#22 1 8.610 0.104 0.000 0.000 86.000 M 37.30 3.325
8.610 37.30 3.325
#23 1 2.790 0.044 0.000 0.000 86.000 M 12.09 1.077
11.400 49.39 4.402
#35 11.400 49.39 4.402
#20 1 14.660 0.062 0.000 0.000 86.000 M 63.51 5.662
14.660 63.51 5.662
#21 1 1.090 0.027 0.000 0.000 86.000 M 4.72 0.421
E 15.750 68.23 6.082
#34 15.750 68.23 6.082
#19 1 5.730 0.021 0.000 0.000 86.000 M 24.82 2.213
5.730 24.82 2.213
#18 1 1.090 0.018 0.000 0.000 86.000 M 4.72 0.421
6.820 29.55 2.633
#33 6.820 29.55 2.633
#16 1 3.120 0.017 0.000 0.000 86.000 M 13.52 1.205
3.120 13.52 1.205
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

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r'n ...i hf IGOP-9(19(1 Pamela I Q,h,e h
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SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#17 1 0.800 0.013 0.000 0.000 86.000 M 3.47 0.308
3.920 16.98 1.513
#32 3.920 16.98 1.513
#15 1 6.450 0.065 0.000 0.000 86.000 M 27.94 2.491
6.450 27.94 2.491
#14 1 19.820 0.099 0.000 0.000 86.000 M 85.86 7.654
19.820 85.86 7.654
#11 1 0.640 0.004 0.000 0.000 86.000 M 2.77 0.247
0.640 2.77 0.247
#10 1 0.650 0.044 0.000 0.000 86.000 M 2.82 0.251
21.110 91.45 8.152
#12 1 2.410 0.035 0.000 0.000 86.000 M 10.44 0.931
E 29.970 129.84 11.573
#31 29.970 129.84 11.573
#13 1 9.390 0.052 0.000 0.000 86.000 M 40.68 3.626
9.390 40.68 3.626
#40 1 1.900 0.009 0.000 0.000 86.000 M 8.23 0.734
1.900 8.23 0.734
#39 1 3.780 0.011 0.000 0.000 86.000 M 16.38 1.460
3.780 16.38 1.460
#7 1 0.730 0.028 0.000 0.000 86.000 M 3.16 0.281
6.410 27.77 2.475
#8 1 2.480 0.032 0.000 0.000 86.000 M 10.74 0.958
18.280 79.19 7.059
#30 18.280 79.19 7.059
#41 1 0.570 0.020 0.000 0.000 86.000 M 2.47 0.220
0.570 2.47 0.220
#5 1 17.130 0.099 0.000 0.000 86.000 M 74.21 6.615
17.130 74.21 6.615
#6 1 0.350 0.020 0.000 0.000 86.000 M 1.52 0.134
17.480 75.73 6.750
#1 1 2.160 0.076 0.000 0.000 86.000 M 9.36 0.834
Filename:PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
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SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
E 2.160 9.36 0.834
#3 1 1.800 0.032 0.000 0.000 86.000 M 7.80 0.695
E 22.010 95.35 8.498
#29 22.010 95.35 8.498
#44 1 2.170 0.111 0.000 0.000 86.000 M 9.40 0.838
2.170 9.40 0.838
#42 1 2.000 0.076 0.000 0.000 86.000 M 8.66 0.772
E 2.000 8.66 0.772
#4 1 12.280 0.048 0.000 0.000 86.000 M 53.20 4.742
12.280 53.20 4.742
#2 1 2.150 0.034 0.000 0.000 86.000 M 9.31 0.830
18.600 80.58 7.183
#28 18.600 80.58 7.183
F#38 152.520 660.74 58.895
Subwatershed Time of Concentration Details;
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#1 1 5. Nearly bare and untilled, and 2.20 9.01 409.54 1.480 0.076
alluvial valley fans
#1 1 Time of Concentration: 0.076
#2 1 5. Nearly bare and untilled, and 50.00 14.50 29.00 7.070 0.001
alluvial valley fans
5. Nearly bare and untilled, and 8.00 2.15 26.87 2.820 0.002
alluvial valley fans
8. Large gullies, diversions, and low 0.50 0.07 14.00 2.120 0.001
flowing streams
8. Large gullies, diversions, and low 50.00 3.50 7.00 21.210 0.000
flowing streams
8. Large gullies, diversions, and low 0.50 1.15 230.00 2.120 0.030
flowing streams
#2 1 Time of Concentration: 0.034
#3 1 8. Large gullies, diversions, and low 16.00 11.84 74.00 12.000 0.001
flowing streams
8. Large gullies, diversions, and low 0.50 1.21 242.00 2.120 0.031
flowing streams
#3 1 Time of Concentration: 0.032
#4 1 5. Nearly bare and untilled, and 50.00 23.50 47.00 7.070 0.001
alluvial valley fans
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
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Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 1.00 1.93 193.00 3.000 0.017
flowing streams
8. Large gullies,diversions,and low 37.00 169.09 457.00 18.240 0.006
flowing streams
8. Large gullies,diversions,and low 2.36 9.65 409.00 4.600 0.024
flowing streams
#4 1 Time of Concentration: 0.048
#5 1 5. Nearly bare and untilled, and 6.64 7.96 120.00 2.570 0.012
alluvial valley fans
8. Large gullies, diversions, and low 8.24 224.53 2,725.00 8.610 0.087
flowing streams
#5 1 Time of Concentration: 0.099
#6 1 5. Nearly bare and untitled, and 50.00 17.00 34.00 7.070 0.001
alluvial valley fans
5. Nearly bare and untilled,and 12.30 3.93 32.00 3.500 0.002
alluvial valley fans
8. Large gullies, diversions, and low 0.50 0.25 50.00 2.120 0.006
flowing streams
8. Large gullies,diversions,and low 3.00 6.45 215.00 5.190 0.011
flowing streams
#6 1 Time of Concentration: 0.020
#7 1 8. Large gullies,diversions,and low 5.16 36.58 709.00 6.810 0.028
flowing streams
#7 1 Time of Concentration: 0.028
#8 1 8. Large gullies, diversions, and low 50.00 22.50 45.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.50 1.25 250.00 2.120 0.032
flowing streams
#8 1 Time of Concentration: 0.032
#10 1 5. Nearly bare and untilled,and 12.50 3.12 25.00 3.530 0.001
alluvial valley fans
8. Large gullies, diversions, and low 1.26 6.61 525.00 3.360 0.043
flowing streams
#10 1 Time of Concentration: 0.044
#11 1 8. Large gullies, diversions, and low 1.00 0.19 20.00 3.000 0.001
flowing streams
8. Large gullies,diversions,and low 35.00 65.44 187.00 17.740 0.002
flowing streams
8. Large gullies, diversions, and low 11.00 4.40 40.00 9.940 0.001
flowing streams
#11 1 Time of Concentration: 0.004
#12 1 5. Nearly bare and untilled,and 50.00 58.00 116.00 7.070 0.004
alluvial valley fans
8. Large gullies,diversions,and low 0.50 1.19 240.00 2.120 0.031
flowing streams
#12 1 Time of Concentration: 0.035
#13 1 5. Nearly bare and untitled, and 50.00 24.50 49.00 7.070 0.001
alluvial valley fans
Filename:PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
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Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 1.00 2.09 210.00 3.000 0.019
flowing streams
8. Large gullies,diversions,and low 37.00 186.11 503.00 18.240 0.007
flowing streams
8. Large gullies,diversions,and low 5.90 39.82 675.00 7.280 0.025
flowing streams
#13 1 Time of Concentration: 0.052
#14 1 5. Nearly bare and untilled, and 6.65 7.98 120.00 2.570 0.012
alluvial valley fans
8. Large gullies, diversions, and low 0.60 1.49 249.00 2.320 0.029
flowing streams
8. Large gullies, diversions,and low 37.00 222.74 602.00 18.240 0.009
flowing streams
8. Large gullies,diversions,and low 4.00 42.64 1,066.00 6.000 0.049
flowing streams
#14 1 Time of Concentration: 0.099
#15 1 5. Nearly bare and untilled, and 50.00 25.00 50.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 1.00 2.08 209.00 3.000 0.019
flowing streams
8. Large gullies,diversions,and low 37.00 74.74 202.00 18.240 0.003
flowing streams
8. Large gullies,diversions,and low 4.60 45.08 980.00 6.430 0.042
flowing streams
#15 1 Time of Concentration: 0.065
#16 1 8. Large gullies,diversions,and low 1.00 0.48 48.00 3.000 0.004
flowing streams
8. Large gullies,diversions,and low 37.00 120.99 327.00 18.240 0.004
flowing streams
8. Large gullies,diversions,and low 1.52 1.96 129.00 3.690 0.009
flowing streams
#16 1 Time of Concentration: 0.017
#17 1 8. Large gullies,diversions,and low 3.38 1.08 32.00 5.510 0.001
flowing streams
8. Large gullies,diversions,and low 0.50 0.47 95.00 2.120 0.012
flowing streams
#17 1 Time of Concentration: 0.013
#18 1 8. Large gullies,diversions,and low 2.83 0.90 32.00 5.040 0.001
flowing streams
8. Large gullies,diversions,and low 0.50 0.65 131.00 2.120 0.017
flowing streams
#18 1 Time of Concentration: 0.018
#19 1 5. Nearly bare and untilled,and 50.00 20.00 40.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 1.00 0.38 38.00 3.000 0.003
flowing streams
8. Large gullies,diversions,and low 37.00 213.12 576.00 18.240 0.008
flowing streams
8. Large gullies,diversions,and low 3.80 7.29 192.00 5.840 0.009
flowing streams
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
18
Stru SWS o Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(/o) (ft) (ft) (fps) Time(hrs)
#19 1 Time of Concentration: 0.021
#20 1 5. Nearly bare and untilled,and 5.60 8.06 144.00 2.360 0.016
alluvial valley fans
5. Nearly bare and untilled,and 50.00 20.00 40.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 1.00 2.00 200.00 3.000 0.018
flowing streams
8. Large gullies,diversions,and low 37.00 203.13 549.00 18.240 0.008
flowing streams
8. Large gullies, diversions, and low 5.20 24.59 473.00 6.840 0.019
flowing streams
#20 1 Time of Concentration: 0.062
#21 1 8. Large gullies, diversions, and low 50.00 7.50 15.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.50 1.04 208.00 2.120 0.027
flowing streams
#21 1 Time of Concentration: 0.027
#22 1 5. Nearly bare and untilled, and 50.00 25.00 50.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 0.60 1.80 300.00 2.320 0.035
flowing streams
8. Large gullies,diversions,and low 37.00 190.55 515.00 18.240 0.007
flowing streams
8. Large gullies, diversions, and low 1.57 13.09 834.00 3.750 0.061
flowing streams
#22 1 Time of Concentration: 0.104
#23 1 7. Paved area and small upland 2.60 9.20 354.00 3.240 0.030
gullies
8. Large gullies,diversions,and low 0.50 0.53 107.00 2.120 0.014
flowing streams
#23 1 Time of Concentration: 0.044
#24 1 7. Paved area and small upland 3.37 33.39 991.00 3.690 0.074
gullies
5. Nearly bare and untilled, and 50.00 3.50 7.00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions,and low 0.50 1.15 230.00 2.120 0.030
flowing streams
#24 1 Time of Concentration: 0.104
#25 1 5. Nearly bare and untilled, and 50.00 22.50 45.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 1.00 1.43 143.00 3.000 0.013
flowing streams
8. Large gullies,diversions,and low 35.00 123.20 352.00 17.740 0.005
flowing streams
8. Large gullies,diversions,and low 4.20 10.33 246.00 6.140 0.011
flowing streams
#25 1 Time of Concentration: 0.030
#26 1 5. Nearly bare and untilled, and 50.00 13.50 27.00 7.070 0.001
alluvial valley fans
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
19
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 1.00 2.00 200.00 3.000 0.018
flowing streams
8. Large gullies,diversions,and low 37.00 187.59 506.99 18.240 0.007
flowing streams
8. Large gullies,diversions,and low 5.31 28.14 530.00 6.910 0.021
flowing streams
#26 1 Time of Concentration: 0.047
#27 1 8. Large gullies,diversions,and low 50.00 22.50 45.00 21.210 0.000
flowing streams
8. Large gullies, diversions, and low 0.50 1.14 228.00 2.120 0.029
flowing streams
#27 1 Time of Concentration: 0.029
#39 1 5. Nearly bare and untitled, and 50.00 25.50 51.00 7.070 0.002
alluvial valley fans
8. Large gullies,diversions,and low 1.00 0.45 45.00 3.000 0.004
flowing streams
8. Large gullies, diversions, and low 37.00 125.80 340.00 18.240 0.005
flowing streams
#39 1 Time of Concentration: 0.011
#40 1 8. Large gullies, diversions, and low 0.50 0.21 42.00 2.120 0.005
flowing streams
8. Large gullies,diversions,and low 37.00 115.07 311.00 18.240 0.004
flowing streams
#40 1 Time of Concentration: 0.009
#41 1 5. Nearly bare and untilled, and 1.00 0.39 39.00 1.000 0.010
alluvial valley fans
8. Large gullies,diversions,and low 3.30 6.66 201.81 5.440 0.010
flowing streams
#41 1 Time of Concentration: 0.020
#42 1 8. Large gullies,diversions,and low 5.20 8.83 170.00 6.840 0.006
flowing streams
8. Large gullies, diversions, and low 4.60 7.13 155.00 6.430 0.006
flowing streams
8. Large gullies,diversions,and low 4.20 13.81 329.00 6.140 0.014
flowing streams
8. Large gullies,diversions,and low 0.50 1.93 386.00 2.120 0.050
flowing streams
#42 1 Time of Concentration: 0.076
#43 1 5. Nearly bare and untilled, and 18.00 6.66 37.00 4.240 0.002
alluvial valley fans
5. Nearly bare and untilled, and 50.00 7.50 15.00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions,and low 9.00 10.98 122.00 9.000 0.003
flowing streams
8. Large gullies,diversions,and low 0.50 0.41 83.00 2.120 0.010
flowing streams
#43 1 Time of Concentration: 0.015
#44 1 7. Paved area and small upland 22.00 9.46 43.00 9.440 0.001
gullies
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
20
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 0.50 4.23 847.00 2.120 0.110
flowing streams
#44 1 Time of Concentration: 0.111
Filename: PHASE 1 WASTE ROCK PILE 25 YR.sc4 Printed 05-17-2022

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SEDCAD 4 for Windows
1
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Stormwater Management Plan
Operational - Waste Rock Pile
DrainageArea(s); 1, 2, 3, 3A, 4, 4A, 48, 5, 6, 6A, 7, 8, 10, 11, 12,
13, 13a, 14, 15, 16, 17118, 19120, 21, 22, 23,, 24, 25126, 26A
and 2
Storm Event; 25-Year/24-Hour
MM&A Project No, PLIT109
January 2021
Filename: Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #1 =_> #3 0.000 0.000 DA-1
Null #2 =_> #28 0.000 0.000 DA-2
Null #3 =_> #29 0.000 0.000 DA-3
Null #4 =_> #2 0.000 0.000 DA-4
Null #5 =_> #6 0.000 0.000 DA-5
Null #6 =_> #3 0.000 0.000 DA-6
Null #7 =_> #8 0.000 0.000 DA-7
Null #8 =_> #30 0.000 0.000 DA-8
Null #10 =_> #12 0.000 0.000 DA-10
Null #11 =_> #12 0.000 0.000 DA-11
Null #12 =_> #31 0.000 0.000 DA-12
Null #13 =_> #7 0.000 0.000 DA-13
Null #14 =_> #10 0.000 0.000 DA-14
Null #15 =_> #12 0.000 0.000 DA-15
Null #16 =_> #17 0.000 0.000 DA-16
Null #17 =_> #32 0.000 0.000 DA-17
Null #18 =_> #33 0.000 0.000 DA-18
Null #19 =_> #18 0.000 0.000 DA-19
Null #20 =_> #21 0.000 0.000 DA-20
Null #21 =_> #34 0.000 0.000 DA-21
Null #22 =_> #23 0.000 0.000 DA-22
Null #23 =_> #35 0.000 0.000 DA-23
Null #24 =_> #36 0.000 0.000 DA-24
Null #25 =_> #24 0.000 0.000 DA-25
Null #26 =_> #27 0.000 0.000 DA-26
Null #27 =_> #37 0.000 0.000 DA-27
Null #28 =_> #38 0.000 0.000 SED BASIN 1 OUTLET
Null #29 =_> #38 0.000 0.000 SED BASIN 2 OUTLET
Null #30 =_> #38 0.000 0.000 SED BASIN 3 OUTLET
Null #31 =_> #38 0.000 0.000 SED BASIN 4 OUTLET
Null #32 =_> #38 0.000 0.000 SED BASIN 5 OUTLET
Null #33 =_> #38 0.000 0.000 SED BASIN 6 OUTLET
Null #34 =_> #38 0.000 0.000 SED BASIN 7 OUTLET
Null #35 =_> #38 0.000 0.000 SED BASIN 8 OUTLET
Null #36 =_> #38 0.000 0.000 SED BASIN 9 OUTLET
Null #37 =_> #38 0.000 0.000 SED BASIN 10 OUTLET
Null #38 =_> End 0.000 0.000 NULL
Null #39 =_> #7 0.000 0.000 DA-6a
Null #40 =_> #8 0.000 0.000 DA-13a
Null #41 =_> #3 0.000 0.000 DA-3a
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
4
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #42 =_> #2 0.000 0.000 DA-4a
Null #43 =_> #27 0.000 0.000 DA-26a
Null #44 =_> #2 0.000 0.000 DA-4b
#43
Null
#26
Null
#27
Null
#37
Null
#25
Null
#24
Null
#36
Null
#22
Null
#23
Null
#35
Null
#20
Null
#21
Null
#34
Null
#19
Null
#18
Null
#33
Null
#16
Null
#17
Null
#32
Null
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
5
#15
Null
#11
Nu//
#14
Null
#10
NU/1
#12
NU/1
#31
Null
#40
Null
#39
Null
#13
Null
#7
Null
#8
NU/1
#30
Null
#41
Null
#5
Null
#6
Null
#1
Null
#3
Null
#29
NUII
#44
Null
#42
Null
#4
NUII
#2
Null
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
6
#28
Null
#38
Null
Filename: Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
7
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#43 0.440 0.440 1.91 0.17
#26 12.360 12.360 53.55 4.77
#27 1.700 14.500 62.82 5.60
#37 0.000 14.500 62.82 5.60
#25 4.020 4.020 17.42 1.55
#24 7.250 11.270 48.82 4.35
#36 0.000 11.270 48.82 4.35
#22 8.610 8.610 37.30 3.33
#23 2.790 11.400 49.39 4.40
#35 0.000 11.400 49.39 4.40
#20 14.510 14.510 62.86 5.60
#21 1.090 15.600 67.58 6.02
#34 0.000 15.600 67.58 6.02
#19 7.930 7.930 34.35 3.06
#18 1.090 9.020 39.08 3.48
#33 0.000 9.020 39.08 3.48
#16 6.630 6.630 28.72 2.56
#17 0.800 7.430 32.19 2.87
#32 0.000 7.430 32.19 2.87
#15 8.380 8.380 36.30 3.24
#11 3.740 3.740 16.20 1.44
#14 7.240 7.240 31.36 2.80
#10 0.740 7.980 34.57 3.08
#12 2.410 22.510 97.52 8.69
#31 0.000 22.510 97.52 8.69
#40 1.990 1.990 8.62 0.77
#39 3.780 3.780 16.38 1.46
#13 6.390 6.390 27.68 2.47
#7 0.730 10.900 47.22 4.21
#8 2.330 15.220 65.94 5.88
#30 0.000 15.220 65.94 5.88
#41 0.760 0.760 3.29 0.29
#5 26.000 26.000 73.70 8.03
#6 0.350 26.350 73.99 8.17
#1 2.960 2.960 12.82 1.14
#3 1.800 31.870 96.54 10.30
#29 0.000 31.870 96.54 10.30
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
(`nnvrinh4 IGOP_9(19(1 Pamela I Rrhmmh
8
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#44 2.000 2.000 8.66 0.77
#42 2.000 2.000 8.66 0.77
#4 12.280 12.280 53.20 4.74
#2 2.150 18.430 79.84 7.12
#28 0.000 18.430 79.84 7.12
#38 0.000 157.250 639.71 58.71
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crheh
9
Structure Detail;
Structure #43
DA 26a
Structure #26(Null)
DA 26
Structure #27
DA-27
Structure #37
SED BASIN 10 OUTLET
Structure #25
DA-25
Structure #24
DA-24
Structure #36(Null1
SED BASIN 9 OUTLET
Structure #22
DA 22
Structure #23
DA 23
Structure #35
SED BASIN 8 OUTLET
Structure #20
DA-20
Structure #21
DA-21
Structure #34
SED BASIN 7 OUTLET
Filename: Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
10
Structure #19
DA-19
Structure #18(Null1
DA-18
Structure #33
SED BASIN 6 OUTLET
Structure #16
DA-16
Structure #17
DA-17
Structure #32
SED BASIN 5 OUTLET
Structure #15
DA-15
Structure #11
DA-11
Structure #14(Null1
DA-14
Structure #10(Null1
DA-10
Structure #12 (Null1
DA-12
Structure #31 (Null1
SED BASIN 4 OUTLET
Structure #40
DA-13a
Structure #39
DA-6a
Filename: Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crheh
11
Structure #13
DA-13
Structure #7(Nulls
DA-7
Structure #8(Nulls
DA-8
Structure #30
SED BASIN 3 OUTLET
Structure #41
DA-3a
Structure #5
DA-5
Structure #6
DA-6
Structure #1
DA-1
Structure #3 (Nulls
DA 3
Structure #29
SED BASIN 2 OUTLET
Structure #44
DA-4b
Structure #42 (Null1
DA-4a
Structure #4
DA-4
Structure #2
DA-2
Filename: Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
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Structure #28
SED BASIN I OUTLET
Structure #38 (Nulls
NULL
Filename: Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP-9(19(1 Pamela I Q,h,e h
13
Subwatershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) (hrs) Number (cfs) (ac-ft
#43 1 0.440 0.015 0.000 0.000 86.000 M 1.91 0.169
0.440 1.91 0.169
#26 1 12.360 0.047 0.000 0.000 86.000 M 53.55 4.773
12.360 53.55 4.773
#27 1 1.700 0.029 0.000 0.000 86.000 M 7.36 0.656
14.500 62.82 5.599
#37 14.500 62.82 5.599
#25 1 4.020 0.030 0.000 0.000 86.000 M 17.42 1.552
4.020 17.42 1.552
#24 1 7.250 0.104 0.000 0.000 86.000 M 31.41 2.800
E 11.270 48.82 4.352
#36 L, 11.270 48.82 4.352
#22 1 8.610 0.104 0.000 0.000 86.000 M 37.30 3.325
8.610 37.30 3.325
#23 1 2.790 0.044 0.000 0.000 86.000 M 12.09 1.077
11.400 49.39 4.402
#35 11.400 49.39 4.402
#20 1 14.510 0.055 0.000 0.000 86.000 M 62.86 5.604
14.510 62.86 5.604
#21 1 1.090 0.027 0.000 0.000 86.000 M 4.72 0.421
15.600 67.58 6.024
#34 15.600 67.58 6.024
#19 1 7.930 0.030 0.000 0.000 86.000 M 34.35 3.062
7.930 34.35 3.062
#18 1 1.090 0.018 0.000 0.000 86.000 M 4.72 0.421
9.020 39.08 3.483
#33 9.020 39.08 3.483
#16 1 6.630 0.033 0.000 0.000 86.000 M 28.72 2.560
6.630 28.72 2.560
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP-9(19(1 Pamela I Q,h,e h
14
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#17 1 0.800 0.013 0.000 0.000 86.000 M 3.47 0.308
7.430 32.19 2.869
#32 7.430 32.19 2.869
#15 1 8.380 0.022 0.000 0.000 86.000 M 36.30 3.236
8.380 36.30 3.236
#11 1 3.740 0.033 0.000 0.000 86.000 M 16.20 1.444
3.740 16.20 1.444
#14 1 7.240 0.045 0.000 0.000 86.000 M 31.36 2.796
7.240 31.36 2.796
#10 1 0.740 0.042 0.000 0.000 86.000 M 3.21 0.285
7.980 34.57 3.081
#12 1 2.410 0.121 0.000 0.000 86.000 M 10.44 0.931
22.510 97.52 8.692
#31 22.510 97.52 8.692
#40 1 1.990 0.006 0.000 0.000 86.000 M 8.62 0.768
1.990 8.62 0.768
#39 1 3.780 0.014 0.000 0.000 86.000 M 16.38 1.460
3.780 16.38 1.460
#13 1 6.390 0.038 0.000 0.000 86.000 M 27.68 2.468
6.390 27.68 2.468
#7 1 0.730 0.028 0.000 0.000 86.000 M 3.16 0.281
10.900 47.22 4.209
#8 1 2.330 0.032 0.000 0.000 86.000 M 10.09 0.900
15.220 65.94 5.877
#30 15.220 65.94 5.877
#41 1 0.760 0.020 0.000 0.000 86.000 M 3.29 0.293
0.760 3.29 0.293
#5 1 26.000 0.286 0.000 0.000 86.000 M 73.70 8.034
26.000 73.70 8.034
#6 1 0.350 0.020 0.000 0.000 86.000 M 1.52 0.134
26.350 73.99 8.168
#1 1 2.960 0.076 0.000 0.000 86.000 M 12.82 1.143
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
15
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
E 2.960 12.82 1.143
#3 1 1.800 0.032 0.000 0.000 86.000 M 7.80 0.695
E 31.870 96.54 10.299
#29 31.870 96.54 10.299
#44 1 2.000 0.111 0.000 0.000 86.000 M 8.66 0.772
2.000 8.66 0.772
#42 1 2.000 0.076 0.000 0.000 86.000 M 8.66 0.772
E 2.000 8.66 0.772
#4 1 12.280 0.048 0.000 0.000 86.000 M 53.20 4.742
E 12.280 53.20 4.742
#2 1 2.150 0.026 0.000 0.000 86.000 M 9.31 0.830
E 18.430 79.84 7.117
#28 18.430 79.84 7.117
F#38 157.250 639.71 58.714
Subwatershed Time of Concentration Details;
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#1 1 5. Nearly bare and untilled, and 2.20 9.01 410.00 1.480 0.076
alluvial valley fans
#1 1 Time of Concentration: 0.076
#2 1 8. Large gullies, diversions, and low 5.72 10.69 187.00 7.170 0.007
flowing streams
8. Large gullies, diversions, and low 50.00 2.50 5.00 21.210 0.000
flowing streams
8. Large gullies, diversions, and low 0.50 0.75 151.00 2.120 0.019
flowing streams
#2 1 Time of Concentration: 0.026
#3 1 8. Large gullies, diversions, and low 16.00 11.84 74.00 12.000 0.001
flowing streams
8. Large gullies, diversions, and low 0.50 1.21 243.00 2.120 0.031
flowing streams
#3 1 Time of Concentration: 0.032
#4 1 5. Nearly bare and untilled, and 50.00 23.50 47.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 1.00 1.93 193.00 3.000 0.017
flowing streams
8. Large gullies, diversions, and low 37.00 169.09 457.00 18.240 0.006
flowing streams
Filename: Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
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Stru SWS o Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(/o) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 2.36 9.65 409.00 4.600 0.024
flowing streams
#4 1 Time of Concentration: 0.048
#5 1 5. Nearly bare and untilled, and 0.50 2.51 502.00 0.700 0.199
alluvial valley fans
8. Large gullies,diversions,and low 8.24 224.53 2,725.00 8.610 0.087
flowing streams
#5 1 Time of Concentration: 0.286
#6 1 5. Nearly bare and untilled,and 50.00 17.00 34.00 7.070 0.001
alluvial valley fans
5. Nearly bare and untilled,and 12.30 3.93 32.00 3.500 0.002
alluvial valley fans
8. Large gullies,diversions, and low 0.50 0.25 50.00 2.120 0.006
flowing streams
8. Large gullies,diversions,and low 3.00 6.45 215.00 5.190 0.011
flowing streams
#6 1 Time of Concentration: 0.020
#7 1 8. Large gullies, diversions, and low 5.16 36.58 709.00 6.810 0.028
flowing streams
#7 1 Time of Concentration: 0.028
#8 1 8. Large gullies,diversions,and low 50.00 22.50 45.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.50 1.25 250.00 2.120 0.032
flowing streams
#8 1 Time of Concentration: 0.032
#10 1 5. Nearly bare and untilled, and 50.00 19.00 38.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions, and low 1.80 10.74 597.00 4.020 0.041
flowing streams
#10 1 Time of Concentration: 0.042
#11 1 8. Large gullies,diversions,and low 1.00 0.39 40.00 3.000 0.003
flowing streams
8. Large gullies,diversions,and low 37.00 248.27 671.00 18.240 0.010
flowing streams
8. Large gullies, diversions, and low 1.56 4.39 282.00 3.740 0.020
flowing streams
#11 1 Time of Concentration: 0.033
#12 1 7. Paved area and small upland 11.00 15.73 143.00 6.670 0.005
gullies
5. Nearly bare and untitled, and 0.50 0.58 116.00 0.700 0.046
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.24 240.00 0.940 0.070
flowing streams
#12 1 Time of Concentration: 0.121
#13 1 5. Nearly bare and untilled,and 50.00 14.50 29.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 1.00 0.58 59.00 3.000 0.005
flowing streams
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
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Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 50.00 20.00 40.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 1.00 0.89 89.00 3.000 0.008
flowing streams
8. Large gullies,diversions,and low 50.00 30.00 60.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 1.00 1.38 138.00 3.000 0.012
flowing streams
8. Large gullies, diversions, and low 37.00 311.91 843.00 18.240 0.012
flowing streams
#13 1 Time of Concentration: 0.038
#14 1 5. Nearly bare and untitled, and 50.00 15.00 30.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 0.80 2.51 314.00 2.680 0.032
flowing streams
8. Large gullies, diversions, and low 37.00 301.92 816.00 18.240 0.012
flowing streams
#14 1 Time of Concentration: 0.045
#15 1 5. Nearly bare and untilled, and 50.00 20.00 40.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 1.00 0.53 54.00 3.000 0.005
flowing streams
8. Large gullies,diversions,and low 50.00 20.00 40.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 1.00 0.75 75.00 3.000 0.006
flowing streams
8. Large gullies,diversions,and low 50.00 20.00 40.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 1.00 0.44 44.00 3.000 0.004
flowing streams
8. Large gullies,diversions,and low 37.00 142.08 384.00 18.240 0.005
flowing streams
8. Large gullies,diversions,and low 4057.00 39,758.60 980.00 191.080 0.001
flowing streams
#15 1 Time of Concentration: 0.022
#16 1 5. Nearly bare and untilled,and 50.00 15.00 30.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 1.00 1.38 138.00 3.000 0.012
flowing streams
8. Large gullies,diversions,and low 37.00 255.67 691.00 18.240 0.010
flowing streams
8. Large gullies,diversions,and low 1.50 1.93 129.00 3.670 0.009
flowing streams
8. Large gullies, diversions, and low 3.40 1.08 32.00 5.530 0.001
flowing streams
#16 1 Time of Concentration: 0.033
#17 1 8. Large gullies,diversions,and low 3.38 1.08 32.00 5.510 0.001
flowing streams
8. Large gullies, diversions, and low 0.50 0.47 95.00 2.120 0.012
flowing streams
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
18
Stru SWS o Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(/o) (ft) (ft) (fps) Time(hrs)
#17 1 Time of Concentration: 0.013
#18 1 8. Large gullies,diversions,and low 2.83 0.90 32.00 5.040 0.001
flowing streams
8. Large gullies,diversions,and low 0.50 0.65 131.00 2.120 0.017
flowing streams
#18 1 Time of Concentration: 0.018
#19 1 5. Nearly bare and untilled,and 50.00 14.50 29.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 1.00 1.91 191.00 3.000 0.017
flowing streams
8. Large gullies,diversions,and low 37.00 254.19 687.00 18.240 0.010
flowing streams
8. Large gullies,diversions, and low 1.70 0.49 29.00 3.910 0.002
flowing streams
#19 1 Time of Concentration: 0.030
#20 1 5. Nearly bare and untilled,and 50.00 18.00 36.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 1.00 1.07 108.00 3.000 0.010
flowing streams
8. Large gullies, diversions, and low 37.00 222.00 600.00 18.240 0.009
flowing streams
8. Large gullies,diversions,and low 5.20 45.13 868.00 6.840 0.035
flowing streams
#20 1 Time of Concentration: 0.055
#21 1 8. Large gullies, diversions, and low 50.00 7.50 15.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.50 1.04 208.00 2.120 0.027
flowing streams
#21 1 Time of Concentration: 0.027
#22 1 5. Nearly bare and untilled,and 50.00 25.00 50.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 0.60 1.80 300.00 2.320 0.035
flowing streams
8. Large gullies,diversions,and low 37.00 190.55 515.00 18.240 0.007
flowing streams
8. Large gullies,diversions,and low 1.57 13.09 834.00 3.750 0.061
flowing streams
#22 1 Time of Concentration: 0.104
#23 1 7. Paved area and small upland 2.60 9.20 354.00 3.240 0.030
gullies
8. Large gullies,diversions,and low 0.50 0.53 107.00 2.120 0.014
flowing streams
#23 1 Time of Concentration: 0.044
#24 1 7. Paved area and small upland 3.37 33.39 990.80 3.690 0.074
gullies
8. Large gullies,diversions,and low 50.00 3.50 7.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.50 1.15 230.00 2.120 0.030
flowing streams
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
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Stru SWS o Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(/o) (ft) (ft) (fps) Time(hrs)
#24 1 Time of Concentration: 0.104
#25 1 5. Nearly bare and untilled,and 50.00 22.50 45.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 1.00 1.43 143.00 3.000 0.013
flowing streams
8. Large gullies,diversions,and low 35.00 123.20 352.00 17.740 0.005
flowing streams
8. Large gullies,diversions,and low 4.20 10.33 246.00 6.140 0.011
flowing streams
#25 1 Time of Concentration: 0.030
#26 1 5. Nearly bare and untilled,and 50.00 13.50 27.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions, and low 1.00 2.00 200.00 3.000 0.018
flowing streams
8. Large gullies,diversions,and low 37.00 187.59 506.99 18.240 0.007
flowing streams
8. Large gullies, diversions, and low 5.36 28.40 530.00 6.940 0.021
flowing streams
#26 1 Time of Concentration: 0.047
#27 1 8. Large gullies, diversions, and low 50.00 22.50 45.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.50 1.14 228.00 2.120 0.029
flowing streams
#27 1 Time of Concentration: 0.029
#39 1 8. Large gullies, diversions, and low 1.00 1.00 100.00 3.000 0.009
flowing streams
8. Large gullies,diversions,and low 37.00 143.81 388.67 18.240 0.005
flowing streams
#39 1 Time of Concentration: 0.014
#40 1 8. Large gullies,diversions,and low 0.50 0.05 11.00 2.120 0.001
flowing streams
8. Large gullies, diversions, and low 37.00 138.75 375.00 18.240 0.005
flowing streams
#40 1 Time of Concentration: 0.006
#41 1 5. Nearly bare and untilled, and 1.00 0.39 39.00 1.000 0.010
alluvial valley fans
8. Large gullies,diversions,and low 3.30 6.66 202.00 5.440 0.010
flowing streams
#41 1 Time of Concentration: 0.020
#42 1 8. Large gullies, diversions, and low 5.20 8.83 170.00 6.840 0.006
flowing streams
8. Large gullies,diversions,and low 4.60 7.13 155.00 6.430 0.006
flowing streams
8. Large gullies,diversions,and low 4.20 13.81 329.00 6.140 0.014
flowing streams
8. Large gullies,diversions,and low 0.50 1.93 386.00 2.120 0.050
flowing streams
#42 1 Time of Concentration: 0.076
Filename:Operational-Waste Rock Pile.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
20
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#43 1 5. Nearly bare and untilled, and 18.00 6.66 37.00 4.240 0.002
alluvial valley fans
5. Nearly bare and untilled, and 50.00 7.50 15.00 7.070 0.000
alluvial valley fans
8. Large gullies, diversions, and low 9.00 10.98 122.00 9.000 0.003
flowing streams
8. Large gullies, diversions, and low 0.50 0.41 83.00 2.120 0.010
flowing streams
#43 1 Time of Concentration: 0.015
#44 1 7. Paved area and small upland 22.00 9.46 43.00 9.440 0.001
gullies
8. Large gullies, diversions, and low 0.50 4.23 847.00 2.120 0.110
flowing streams
#44 1 Time of Concentration: 0.111
Filename: Operational-Waste Rock Pile.sc4 Printed 05-17-2022

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Drainage Calculations for Concentrate Operations,Piedmont Lithium Carolinas,Inc.
Gaston County,North Carolina
►►' ►► May2022
Plant Pad Area
• Plant Pad Area — Pre-Construction Sedcad 4 Calculations
• Plant Pad Area —Operational Sedcad 4 Calculations
MARSHALL MILLER&ASSOCIATES INc.

SEDCAD 4 for Windows
r'n ...inhf IQaR_9l19O Pamela I Q,h,e h
1
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Stormwater Management Plan
Plant Site (Pre-Construction Phase)
Storm Event; 25 -Year/ 24-Hour
MM&A Project No, PLIT1O9
March 2022
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #1 =_> #18 0.000 0.000 DA-118(SB-14)
Null #2 =_> #18 0.000 0.000 DA-119(SB-16)
Null #3 =_> #2 0.000 0.000 DA-120
Null #4 =_> #6 0.000 0.000 DA-121
Null #5 =_> #6 0.000 0.000 DA-122
Null #6 =_> #18 0.000 0.000 DA-123(SK69)
Null #7 =_> #18 0.000 0.000 DA-124(SK68)
Null #8 =_> #7 0.000 0.000 DA-125
Null #9 =_> #7 0.000 0.000 DA-126
Null #10 =_> #12 0.000 0.000 DA-127
Null #11 =_> #12 0.000 0.000 DA-128
Null #12 =_> #18 0.000 0.000 DA-129(SK67)
Null #13 =_> #14 0.000 0.000 DA-130
Null #14 =_> #18 0.000 0.000 DA-131 (SK66)
Null #15 =_> #1 0.000 0.000 DA-132
Null #16 =_> #14 0.000 0.000 DA-133
Null #17 =_> #1 0.000 0.000 DA-134
Null #18 =_> End 0.000 0.000 DISCHARGE OFF SITE
#16
Null
#13
Null
#14
Null
#11
Null
#10
Null
#12
Null
#9
Null
#6
Null
#7
Null
#5
Null
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crh�e��h
4
#4
Null
#6
Null
#3
Null
#2
Null
#17
Null
#15
Null
#1
Null
#IS
Null
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
5
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#16 0.550 0.550 2.38 0.21
#13 0.920 0.920 3.99 0.35
#14 5.610 7.080 23.60 2.33
#11 4.830 4.830 20.92 1.87
#10 0.810 0.810 3.51 0.31
#12 1.330 6.970 30.20 2.69
#9 0.820 0.820 3.55 0.32
#8 1.900 1.900 8.23 0.73
#7 0.570 3.290 14.25 1.27
#5 2.640 2.640 11.44 1.02
#4 1.080 1.080 4.68 0.42
#6 0.180 3.900 16.90 1.50
#3 0.250 0.250 1.08 0.10
#2 17.530 17.780 55.84 5.60
#17 1.070 1.070 4.64 0.41
#15 1.380 1.380 5.98 0.53
#1 49.210 51.660 149.38 16.25
#18 0.000 90.680 289.27 29.64
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
6
Structure Detail;
Structure #16(Null)
DA-133
Structure #13 (Null)
DA-130
Structure #14 (Null)
DA-131 (51666)
Structure #11 (Null)
DA-128
Structure #10 (Null)
DA-127
Structure #12 (Null)
DA-129 (SK67)
Structure #9 (Null)
DA-126
Structure #8(Null)
DA-12S
Structure #7(Null)
DA-124 (51668)
Structure #S(Null)
DA-122
Structure #4 (Null)
DA-121
Structure #6(Null)
DA-123 (SK69)
Structure #3 (Null)
DA-120
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
7
Structure #2 (Null)
DA-119 (SB-16)
Structure #17(Null)
DA-134
Structure #15(Null)
DA-132
Structure #1
DA-118(SB-14)
Structure #18
DISCHARGE OFF SITE
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP-9(19(1 Pamela I Q,h,e h
8
Subwatershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) (hrs) Number (cfs) (ac-ft
#16 1 0.550 0.026 0.000 0.000 86.000 M 2.38 0.212
0.550 2.38 0.212
#13 1 0.920 0.031 0.000 0.000 86.000 M 3.99 0.355
0.920 3.99 0.355
#14 1 5.610 0.160 0.000 0.000 86.000 M 17.80 1.762
7.080 23.60 2.329
#11 1 4.830 0.041 0.000 0.000 86.000 M 20.92 1.865
4.830 20.92 1.865
#10 1 0.810 0.026 0.000 0.000 86.000 M 3.51 0.312
0.810 3.51 0.312
#12 1 1.330 0.059 0.000 0.000 86.000 M 5.76 0.513
6.970 30.20 2.691
#9 1 0.820 0.025 0.000 0.000 86.000 M 3.55 0.316
0.820 3.55 0.316
#8 1 1.900 0.063 0.000 0.000 86.000 M 8.23 0.734
1.900 8.23 0.734
#7 1 0.570 0.033 0.000 0.000 86.000 M 2.47 0.220
3.290 14.25 1.269
#5 1 2.640 0.049 0.000 0.000 86.000 M 11.44 1.019
2.640 11.44 1.019
#4 1 1.080 0.041 0.000 0.000 86.000 M 4.68 0.417
1.080 4.68 0.417
#6 1 0.180 0.025 0.000 0.000 86.000 M 0.78 0.068
3.900 16.90 1.504
#3 1 0.250 0.012 0.000 0.000 86.000 M 1.08 0.096
0.250 1.08 0.096
#2 1 17.530 0.142 0.000 0.000 86.000 M 55.63 5.506
17.780 55.84 5.601
#17 1 1.070 0.025 0.000 0.000 86.000 M 4.64 0.413
1.070 4.64 0.413
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP-9(19(1 Pamela I Q,h,e h
9
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#15 1 1.380 0.031 0.000 0.000 86.000 M 5.98 0.533
1.380 5.98 0.533
#1 1 49.210 0.233 0.000 0.000 86.000 M 146.18 15.303
51.660 149.38 16.248
#18 90.680 289.27 29.643
Subwatershed Time of Concentration Details;
Stru SWS o Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(/o) (ft) (ft) (fps) Time(hrs)
#1 1 7. Paved area and small upland 1.30 7.85 604.00 2.290 0.073
gullies
8. Large gullies,diversions,and low 5.80 113.79 1,962.00 7.220 0.075
flowing streams
8. Large gullies,diversions,and low 0.10 0.29 291.00 0.940 0.085
flowing streams
#1 1 Time of Concentration: 0.233
#2 1 7• Paved area and small upland 2.09 13.89 665.00 2.910 0.063
gullies
8. Large gullies,diversions,and low 1.00 0.97 98.00 3.000 0.009
flowing streams
7. Paved area and small upland 7.80 34.63 444.00 5.620 0.021
gullies
8. Large gullies,diversions,and low 3.06 8.78 287.00 5.240 0.015
flowing streams
8. Large gullies,diversions,and low 0.10 0.11 118.00 0.940 0.034
flowing streams
#2 1 Time of Concentration: 0.142
#3 1 5. Nearly bare and untilled,and 50.00 13.50 27.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 3.00 6.27 209.00 5.190 0.011
flowing streams
#3 1 Time of Concentration: 0.012
#4 1 5. Nearly bare and untilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 4.70 44.03 937.00 6.500 0.040
flowing streams
#4 1 Time of Concentration: 0.041
#5 1 7. Paved area and small upland 2.70 4.72 175.00 3.300 0.014
gullies
8. Large gullies,diversions,and low 4.90 41.89 855.00 6.640 0.035
flowing streams
#5 1 Time of Concentration: 0.049
#6 1 8. Large gullies,diversions,and low 50.00 7.50 15.00 21.210 0.000
flowing streams
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
10
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 0.10 0.08 86.00 0.940 0.025
flowing streams
#6 1 Time of Concentration: 0.025
#7 1 7. Paved area and small upland 9.70 26.38 272.00 6.260 0.012
gullies
8. Large gullies, diversions, and low 50.00 14.00 28.00 21.210 0.000
flowing streams
8. Large gullies, diversions, and low 0.10 0.07 72.00 0.940 0.021
flowing streams
#7 1 Time of Concentration: 0.033
#8 1 7. Paved area and small upland 5.50 25.19 458.00 4.720 0.026
gullies
8. Large gullies, diversions, and low 0.50 1.42 284.00 2.120 0.037
flowing streams
#8 1 Time of Concentration: 0.063
#9 1 7. Paved area and small upland 4.20 11.63 277.00 4.120 0.018
gullies
8. Large gullies, diversions, and low 7.00 15.19 217.00 7.930 0.007
flowing streams
#9 1 Time of Concentration: 0.025
#10 1 5. Nearly bare and untilled, and 50.00 22.50 45.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 5.70 37.05 650.00 7.160 0.025
flowing streams
#10 1 Time of Concentration: 0.026
#11 1 7. Paved area and small upland 6.50 35.48 546.00 5.130 0.029
gullies
8. Large gullies, diversions, and low 5.02 15.26 304.00 6.720 0.012
flowing streams
#11 1 Time of Concentration: 0.041
#12 1 7. Paved area and small upland 13.70 52.74 385.00 7.450 0.014
gullies
8. Large gullies, diversions, and low 0.50 1.08 217.00 2.120 0.028
flowing streams
8. Large gullies, diversions, and low 50.00 5.00 10.00 21.210 0.000
flowing streams
8. Large gullies, diversions, and low 0.10 0.06 60.00 0.940 0.017
flowing streams
#12 1 Time of Concentration: 0.059
#13 1 5. Nearly bare and untilled, and 50.00 13.50 27.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 5.50 41.91 762.00 7.030 0.030
flowing streams
#13 1 Time of Concentration: 0.031
#14 1 7. Paved area and small upland 9.93 66.23 667.00 6.340 0.029
gullies
8. Large gullies, diversions, and low 0.50 4.32 865.00 2.120 0.113
flowing streams
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
11
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 0.10 0.06 61.00 0.940 0.018
flowing streams
#14 1 Time of Concentration: 0.160
#15 1 7. Paved area and small upland 4.90 4.36 89.00 4.450 0.005
gullies
8. Large gullies, diversions, and low 6.00 41.94 699.00 7.340 0.026
flowing streams
#15 1 Time of Concentration: 0.031
#16 1 5. Nearly bare and untilled, and 45.00 24.75 55.00 6.700 0.002
alluvial valley fans
8. Large gullies, diversions, and low 5.70 35.45 622.00 7.160 0.024
flowing streams
#16 1 Time of Concentration: 0.026
#17 1 5. Nearly bare and untilled, and 45.00 24.75 55.00 6.700 0.002
alluvial valley fans
8. Large gullies, diversions, and low 5.70 34.99 614.00 7.160 0.023
flowing streams
#17 1 Time of Concentration: 0.025
Filename: DA118 thru DA134 preconstruct_25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
iowt_,)mn c­i, I Gh,.roh
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Storm water Management Plan
Revised Sediment Basin 14 (DURING MINING PHASE)
Storm Event: 25 -Year/ 24-Hour
MM&A Project No. PLIT109
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename: REVISED S614 25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
2
Genera/Information
Storm Information:
Storm Type: NRCS Type 11
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename:REVISED SB14_25 YR sc4 Printed 03-31-2022

SEDCAD 4 for Windows
Structure Networking:
Type Stru (flows Stru Musk. K Musk. X Description
# Into) # Ors)
Null #1 ==> #2 0.000 0.000 DA-40
Null #2 ==> #3 0.000 0.000 DA-43
Null #3 ==> #6 0.000 0.000 DA-44
Null #4 ==> #9 0.000 0.000 DA-45
Null #5 =_> #4 0.000 0.000 DA-46
Null #6 =_> #9 0.000 0.000 DA-47
Null #7 =_> #4 0.000 0.000 DA-48
Null #8 =_> #9 0.000 0.000 DA-49
Null #9 =_> End 0.000 0.000 DA-50(SB14)
Null #10 __> #9 0.000 0.000 DA-50a
Null #11 =_> #9 0.000 0.000 DA-50b
#11
Null
#10
Null
#8
Null
#1
Null
#z
Null
#3
Null
#6
Null
If #7
Null
Null
#4 —
Null
#9
Null
Filename:REVISED SB14_25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
Structure Summary:
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#11 1.070 1.070 4.64 0.41
#10 1,380 1.380 5.98 0.53
#8 2.480 2,480 7.85 0.78
-#1 8.150 8.150 35.31 3.15-
#2 3,570 11.720 50.77 4.53
#3 8.490 20.210 74.75 7.16
#6 3.510 23.720 89.95 8.52
#7 2.090 2.090 6.63 0.66
#5 1.270 1.270 5.50 0.49
#4 7.330 10.690 34,15 3.44
#9 7.850 47.190 166.43 16.15
Filename:REVISED S814 25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
r`,,.., .,tit ioaa_,)nin P-i. i cti..,ti
5
Structure Detail:
Structure #11 Null
DA-506
Structure #10 LNull)
DA-50a
Structure #8(Null)
DA-49
Structure #1 (Null)
DA-40
Structure #2 Null
DA-43
Structure #. (Null
DA-44
Structure #6(Null)
DA-47
Structure #7 LNull
DA-48
Structure #5(Null)
DA-46
Structure #4(Nall)
DA-45
,5Lruaure #9, Nu11
DA-50 (S814)
Filename. REVISED S814_25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
Subwatershed Hydrology Detail;
Time of Musk K Curve Peak Runoff
Stru SWS SWS Area Conc Musk X UHS Discharge Volume
# # (ac) (hrs) (hrs) Number (cfs) (ac-ft
#11 1 1.070 0.025 0.000 0.000 86.000 M 4.64 0.413
1.070 4.64 0.413
#10 1 1.380 0.031 0.000 0.000 86.000 M 5.98 0.533
71 1.380 5.98 0.533
x8 1 2.480 0.170 0.000 0.000 86.000 M 7.85 0.778
F, 2.480 7.85 0.778
91 1 8.150 0.102 0.000 0.000 86.000 M 35.31 3.147
71 8.150 35.31 3.147
#2 1 3.570 0.024 0.000 0.000- 86.000 M 15.47 1.379
F, 11.720 50.77 4.526
#3 1 8.490 0.229 0.000 0.000 86.000 M 25.32 2.638
71 20.210 74.75 7.164
#6 1 3.510 0.090 0.000 0.000 86.000 M 15.21 1.355
1 23.720 89.95 8.519
#7 1 2.090 0.153 0.000 0.000 86.000 M 6.63 0.656
2.090 6.63 0.656
#5 1 1.270 0.060 0.000 0.000 86.000 M 5.50 0.490
1.270 5.50 0.490
94 1 7.330 0.180 0.000 0.000 86.000 M 22.96 2.293
10.690 34.15 3.439
#9 1 7.850 0.131 0.000 0.000 86.000 M 24.91 2.465
47.190 166.43 16.147
Subwatershed Time of Concentration Details:
Stru SWS Land Flow Condition Slope(%) Vert. Dist. Horiz. Dist. Velocity Time(hrs)
ft) (ft) (fps)
#1 1 7. Paved area and small upland 1.00 6.04 604.00 2.010 0.083
gullies
8. Large gullies,diversions,and low 5.00 23.25 465.00 6-700 0.019
flowing streams
#1 1 Time of Concentration: 0.102
Filename:REVISED SB14_25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
(•nm,rinl,f loom.7nin P-i. I Crh.,-h
7
Stru SWS Vert. Dist. Noriz. Dist. Velocity
# # Land Flaw Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#2 1 5. Nearly bare and untilled,and 50.00 9,50 19,00 7.070 0.000
aAuvial vakey fans
8_ Large gullies,diversions, and low 1.00 2.67 268.00 3.000 0.024
flowing streams
#2 1 Time of Concentration: 0.024
#3 1 5. Nearly bare and untilled, and 1.00 5.49 �. 549.00 1.000 0.152
alluvial valley fans
8. Large gullies,diversions,and low 0.50 2.93 588.00 2,120 0.077
flowing streams
8. Large gullies,diversions, and low 50.00 10.00 20.00 21.210 0.000
flowing streams
#3 1 Time of Concentration: 0.229
#4 1 5. Nearly bare and untilled,and 10.00 9.50 95.00 3.160 0.008
alluvial valley fans
S. Nearly bare and untilled, and 0.50 1.54 309.00 0.700 0.122
alluvial valley fans
8. Large gullies,diversions,and low 1.00 3.95 396.00 3.000 0.036
flawing streams
8. Large gullies,diversions,and low 10,00 51.00 510.00 9.480 0.014
flowing streams
#4 1 Time of Concentration: 0.180
#5 1 5. Nearly bare and untilled,and 0.50 0.72 146.00 0.700 0.057
alluvial valley fans
8. Large gullies,diversions,and low 10.00 12.30 123.00 9,480 0.003
flowing streams
3
8. Large gullies,diversions, and low 50.00 15.00 30.00 21.210 0.000
flowing streams
#5 1 Time of Concentration: 0.060
#6 1 7. Paved area and small upland 5.00 22.60 452.00 4.500 0.027
gullies
8. Large gullies,diversions,and;ow 2.00 11.04 552.00 4.240 0,036
flowing streams
8. Large gullies,diversions,and low 1.00 3.00 300.00 3.000 0.027
flowing streams
#6 1 Time of Concentration: 0.090
#7 1 5. Nearly bare and untilled, and 0.50 1.93 386.00 0.700 0.153
alluvial valley fans
#7 1 Time of Concentration: 0.153
#8 1 5. Nearly bare and untilled,and 0.50 0.33 67.00 0.700 0.026
alluvial valley fans
B. Large gullies,diversions, and low
flowing streams 0.50 5.50 1,100.00 2.120 0.144
#8 1 Time of Concentration: 0.170
#9 1 7• Paved area and small upland 7.00 55.02 786.00 5.320 0.041
gullies
5. Nearly bare and untilled,and
alluvial valley fans 50.00 9.50 19.00 7.070 0.000
8. Large gullies,diversions, and low 0.10 0.30 307.00 0.940 0.090
flowing streams
Filename: REVISED SB14 25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
Pnn MM'q l oUR-Ir.l f%D-15 I 4Z hK ah p
V
Stru SWS Vert, Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(°/a) (ft) (ft) (fps) Time(hrs)
#9 1 Time of Concentration: 0.131
#10 1 7• Paved area and small upland 4.90 4,36 89.00 4.450 0.005
gullies
8. Large gullies,diversions,and low 6.00 41.94 699.00 7.340 0.026
flowing streams
#10 1 Time of Concentration: 0.031
#11 1 5. Nearly bare and untilled,and 45.00 24.75 55.00 6.700 0.002
alluvial valley fans
8. Large gullies,diversions,and low 5.70 34.99 614.00 7.160 0.023
flowing streams
#11 1 Time of Concentration: 0.025
Filename:REVISED SIB 14. 25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
f n M. hf 400A_')Ain Pe 1a I Crh... K
Piedmont Lithium Carolinas, Inc.
Gaston Countv, North Carolina
Storm water Management Plan
Revised Sediment Basin 16 (DURING MINING PHASE)
Storm Event: 25 -Year/ 24-Hour
MM&A Project No. PLM 09
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename: REVISED SI316 25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
1aoa_,)mn ate. 1. i
General Information
Storm Information;
Storm Type: NRCS Type If
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: REVISED SB16_25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
!`nm.rinhT loon_'N1111 oor..pre 1 Crh...ah
Structure Networking:
Type Stru (flows Stru Musk. K Musk.X Description
# into) # (hrs)
Null #1 =_> #4 0.000 0.000 DA-40a
Null #2 =_> #4 0.000 0.000 DA-41a
Null #3 =_> End 0.000 0.000 DA-41 (SK16)
Null #4 =_> #3 0.000 0.000 DA 42
#1
Null
#1
Null
#4
Null
#3
Null
Filename:REVISED 5B16 25 YR_sc4 Printed 03-31-2022

SEDCAD 4 for Windows
f`—Mnh1 IOQA.9lNl1 0-1a I cz&K—h
4
Structure Summary:
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) WS) (ac-ft)
#2 0.250 0.250 1.08 0.10
#1 6.590 6.590 28.55 2.54
#4 7.670 14.510 62.86 5.60
#3 3.420 17.930 73.37 6.68
Filename: REVISED SB16 25 YR_so4 Printed 03-31-2022

SEDCAD 4 for Windows
Structure Detail;
Structure #2{Null
DA-41a
Structure #1 Null
DA-40a
tructure #4(Nulls
DA-42
StrT re#3 Null
DA-41 (SKM
Filename:REVISED SB16_25 YR,sc4 Printed 03-31-2022

SEDCAD 4 for Windows
f nn,ninh loos=0nin Como e I C,K,.-h
Subwatershed Hydrology Detail:
Time of Peak Runoff
Stru SWS SWS Area Conc Musk K Musk X Curve UH5 Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#2 1 0.250 0.012 0,000 0.000 86.000 M 1.08 0.096
0.250 1.08 0.096
#1 1 6.590 0.073 0.000 0.000 86.000 M 28.55 2.545
6.590 28.55 2.545�
#4 1 7.670 0.114 0.000 0.000 86.000 M 33.23 2,962
F, 14.510 62.86 5.603
#3 1 3.420 0.127 0.000 0,000 86.000 M 10.85 1.074
17.930 73.37 6.677
Subwatershed Time of Concentration Details:
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flaw Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#1 1 7. Paved area and small upland 2.00 13,29 665.00 2.840 0.065
gullies
8. Large gullies,diversions, and low 1.00 0.97 97.00 3.000 0.008
flowing streams
#1 1 Time of Concentration: 0.073
02 1 5. Nearly bare and untilled,and 50.00 13.50 27.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions, and low 3.00 6.27 209.00 5.190 0.011
flowing streams
#2 1 Time of Concentration: 0.012
#3 1 7. Paved area and small upland 7.00 60.48 864.00 5.320 0.045
gullies
5. Nearly bare and untilled, and 50.00 12.50 25.00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.28 280.00 0.940 0.082
flowing streams
#3 1 Time of Concentration: 0.127
#4 1 S. Nearly bare and untilled,and 1,00 3.86 386.00 1.000 0,107
alluvial valley fans
8. Large gullies,diversions,and low 8.00 17.76 222.00 8.480 0.007
flowing streams
8. Large gullies,diversions, and low flowing streams 50.00 15.00 30.00 21.210 0.000
#4 1 Time of Concentration: 0.114
Filename: REVISED S1316_25 YR.sc4 Printed 03-31-2022

SEDCAD 4 for Windows
Piedmont Lithium Carolinas, Inc.
Gaston County, North Carolina
Stormwater Management Plan
SK68 (DURING MINING PHASE)
Storm Event: 25 -Year/ 24-Hour
MM&A Project No. PLIT109
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: earl.chornsbay@mma 1,corn
Filename:SK68 DURING 25 YR.sc4 Printed 04-04-2022

SEDCAD 4 for Windows
f`r.n..r�nM 1JUA-onln P-1. I
General Information
Storm Information:
Storm Type: NRCS Type 11
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename:SK68 DURING_25 YR.sc4 Printed 04-04-2022

SEDCAD 4 for Windows
f�•nm.nhl 100R_']111A Po.nnle I Crl.u.oh
3
Structure Networking:
Stru (flows Stru Musk. K
Type # into) # (hrs) Musk.X Description
Null #1 =_> #2 0.000 0.000 DA-42a
Null #2 =_> #3 0.000 0.000 DA-42b
Null #3 =_> End 0.000 0.000 DA-42c(SK68)
Null #4 =_> #3 0.000 0.000 DA-42d
4 #4
Null
Ii #1
Null
#2
41 Null
F#3/1
Filename-SK68 DURING 25 YR.sc4 Printed 04-04-2022

SEDCAD 4 for Windows
ibo4-?nsn P—i. i cz,h,.,.k
4
Structure Summary:
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cf�) (ac-ft)
#4 0,550 0.550 2.38 0.21
#1 5.910 5.910 25.60 2.28
#2 0.390 6.300 27.29 2.43
#3 0.410 7.260 31.45 2.80
Filename:SK68 DURING 25 YR.sc4 Printed 04-04-2022

SEDCAD 4 for Windows
icon-,)nin P—ie i c,h—h
Structure Detail:
Structure #4 (Nulls
DA-42d
Structure #1 (Null/
DA-42a
Structure #2(Nulls
DA-426
Structure #K Null
DA-42c(SK68)
Filename:SK68 DURING 25 YR.sc4 Printed 04-04-2022

SEDCAD 4 for Windows
Subwatershed Hydrology Detail;
Time of Musk K Curve Peak Runoff
# # (ac) (hrs) Number
5tru SWS SWS Area Conc Musk X UH5 Discharge Volume �
(hrs) (cfs) (ac-ft)
#4 1 0.550 0.008 0.000 0.000 86.000 M 2.38 0.212
0.550 2.38 0.212
#1 1 5.910 0.073 0.000 0.000 86.000 M 25.60 2.282
5.910 25.60 2.282
#2 1 0.390 0.028 0.000 0.000 86.000 M 1.69 0.150
6.300 27.29 2.432
#3 1 0.410 0.010 0.000 0.000 86.000 M 1.78 0.158
7.260 31.45 2.801
Subwatershed Time of Concentration Details:
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs}
#1 1 5. Nearly bare and untilled,and 50.00 18.50 37.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 1.00 3.82 382.00 3.000 0.035
flowing streams
8. Large gullies,diversions,and low 0.50 1.45 290.00 2.120 0.037
flowing streams
#1 1 Time of Concentration: 0.073
#2 1 5. Nearly bare and untitled,and 50.00 13.50 27.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions, and law 1.00 2.93 294.00 3.000 0.027
flowing streams
#2 1 Time of Concentration: 0.028
#3 1 7. Paved area and small upland 11.00 1.54 14.00 6.670 0.000
gullies
5. Nearly bare and untilled,and 50.00 6.00 12.00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions, and low 0.10 0.03 34.00 0.940 0.010
flowing streams
#3 1 Time of Concentration: 0.010
#4 1 S. Nearly bare and untilled, and 50.00 15.50 31.00 7.070 0.001
alluvial valley fans
B. Large gullies,diversions,and low 9.00 20.61 229.00 9.000 0.007
flowing streams
#4 1 Time of Concentration: 0.008
Filename:SK68 DURING_25 YR.sc4 Printed 04-04-2022

Drainage Calculations for Concentrate Operations,Piedmont Lithium Carolinas,Inc.
Gaston County,North Carolina
►►' ►► May2022
Emulsion Storage and Bulk Truck Parking Area
• Emulsion Storage and Bulk Truck Parking Area — Pre-Construction Sedcad 4 Calculations
• Emulsion Storage and Bulk Truck Parking Area —Operational Sedcad 4 Calculations
MARSHALL MILLER&ASSOCIATES INc.

SEDCAD 4 for Windows
!`nn.ninhf 100R_�A1A Pnmelo 1 Crhureh
Piedmont Lithium Carolinas, Inc.
Gaston Counly, North Carolina
Stormwater Management Plan
Emulsion Site (Pre-Construction Phase)
SK20 thru SK25
Storm Event; 25 -Year/ 24-Hour
MM&A Project No. PUT109
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: earl,chornsbay@mmaLcom
Filename:DA1 thru DA7 preconstruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
General Information
Storm Information:
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: DA1 thru DA7 preconslruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
r— m480R.,min Pe. i. I C-h.eh
Structure Networking:
Stru (flows Stru Musk. K
Type # i nto) # (hrs) Musk.X Description
Null #1 =_> #8 0.000 0.000 SK20
Null #2 ==> #8 0.000 0.000 SK21
Null #3 ==> #8 0.000 0.000 SK22
Null #4 =_> #8 0.000 0.000 SK23
Null #5 =_> #8 0.000 0.000 SK24
Null #6 =_> #8 0.000 0.000 SK25
Null #7 #8 0.000 0.000 Drainage Area 7- Direct Offsite
Null #8 =_> End 0.000 0.000 NULL TOTAL DISCHARGE
#7
Null
#6
Null
#S
Null
#4
Null
#3
Null
� #z
Null
#I
Null
#8
Null
Pilename:DA1 thru DA7 preconstruct_25 YR_sc4 Printed 03-18-2022

SEDCAD 4 for Windows
•-nn—hl lauk_,)n1n P—i. I c,h—K
4
Structure Summary:
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#7 7.040 7.040 12.16 1.24
#6 10.000 10.000 20.45 1.96
#5 3.940 3.940 13.54 1.08
#4 9.640 9.640 36.06 2.96
#3 4.990 4.990 12.62 1.21
#2 5.720 5.720 17.16 1.67
#1 4.260 4.260 11.71 1.12
#8 0.000 45.590 119.10 11.24
Fitename; DA1 thru DA7 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
+'nn,rrinhh iQQW.lnin P-1. I Crh,.roh
Structure Detail:
Structure #7(Nulls
Drainage Area 7- Direct Offsite
Structure #6�Null�
SK25
Structure #5. Ncr11,
SK24
Structure #4 Nulls
SK23
Structure #3 (Nulls
SK22
Structure #2Null
SK21
Structure #1Null
SK20
Structure # ' (Null)
NULL TOTAL DISCHARGE
Filename:DA1 thru DA7 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
f'ny,.w;r,ht IGOR-7n1n D-Ic I CrY.....h
6
Subwatershed Hydrology Detail:
Time of Peak Runoff
Stru SWS SWS Area Conc Musk K Musk X Curve tJHS Discharge Volume
# # (au) (hrs) (hrs) Number (S) (ac-ft)
#7 1 7.040 0.238 0.000 0.000 66.000 M 12.16 1.236
7.040 12.16 1.236
#6 1 10.000 0.181 0.000 0.000 69.000 M 20.45 1.955
E 10.000 20.45 1.955
#5 1 3.940 0.119 0.000 0.000 73.000 M 13.54 1.079
E 3.940 13.54 1.079
#4 1 9.640 0.104 0.000 0.000 77.000 M 36.06 2.961
1 9.640 36.06 2.961
#3 1 4.990 0.176 0.000 0.000 76.000 M 12.62 1.210
E 4.990 12.62 1.210
#2 1 5.720 0.125 0.000 0.000 83.000 M 17.16 1.671
E 5.720 17.16 1.671
#1 1 4.260 0.149 0.000 0.000 79.000 M 11.71 1.123
Y, 4.260 11.71 1.123
#8 Y, 45.590 119.10 11.236
Subwatershed Time a Concentration Details:
Stru SWS Slope( Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Sl %) (ft) (ft) (fps) Time(hrs)
#1 1 3.Short grass pasture 4.60 13.80 300.00 1.710 0.048
7. Paved area and small upland 6.40 22.14 346.00 5.090 0.018
gullies
8. Large gullies,diversions,and low 0.50 1.57 314.00 2.120 0.041
flowing streams
8. Large gullies,diversions,and low 45.00 24.75 55.00 20.120 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.14 144.00 0940 0.042
flowing streams
#1 1 Time of Concentration: 0.149
#2 1 3. Short grass pasture 5.33 15.99 300.00 1.840 0.045
7. Paved area and small upland 7.70 43.19 560.90 5.580 0.027
gullies
8. Large gullies, diversions,and low 0.50 0.66 132.00 2.120 0.017
flowing streams
Filename:DA1 thru DA7 preconstrucl_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
!`nn..rinh+100p.�A7f1 Pemnle I C�hanh
7
Stru SWS Vert.Dist. Horiz. Dist. Velocity
i Land Flow Condition Slope(%) Time(hrs)
# #
(ft) (ft) (fps)
S. Nearly bare and untilled, and 50.00 13.00 26.00 7,070 0.001
alluvial valley fans
B. Large gullies,diversions,and low 0.10 0.12 120.00 0.940 0.035
flowing streams
#2 1 Time of Concentration: 0.125
#3 1 3. Short grass pasture 1.65 4.94 299.39 1.020 0.081
7. Paved area and small upland 14.00 57.68 412.00 7.530 0.015
gullies
8. Large gullies,diversions,and low 0.50 1.71 342.00 2.120 0.044
flowing streams
S. Nearly bare and untilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.12 120.00 0.940 0.035
flowing streams
#3 1 Time of Concentration: 0.176
#4 1 3. Short grass pasture 8.74 26.22 300.00 2.360 0.035
8. Large gullies,diversions, and low 5.74 50.05 871.96 7.180 0.033
flowing streams
5. Nearly bare and untilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions, and low 0.10 0.12 120.00 0.940 0.035
flowing streams
#4 1 Time of Concentration: 0.104
#5 1 3. Short grass pasture 10.20 30.59 299.90 2.550 0.032
7. Paved area and small upland 11.00 9.46 86.00 6.670 0.003
gullies
8. Large gullies,diversions, and low 0.50 1.84 368.00 2.120 0.048
flowing streams
5. Nearly bare and unfilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley Fans
8. Large gullies,diversions,and low 0.10 0.12 120.00 0.940 0.035
flowing streams
#5 1 Time of Concentration: 0.119
#6 1 3. Short grass pasture 2.83 8.49 300.00 1.340 0.062
7. Paved area and small upland 5.84 15.82 270.89 4.860 0.015
gullies
8. Large gullies,diversions, and low 1.50 12.15 810.00 3.670 0.061
flowing streams
8. Large gullies,diversions, and low 13.50 41.85 309.99 11.020 0.007
flowing streams
5. Nearly bare and unfilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions, and low 0.10 0.12 119.99 0.940 0.035
flowing streams
#6 1 Time of Concentration: 0.181
#7 1 3. Short grass pasture 2.16 6.48 300.00 1.170 0.071
7. Paved area and small upland 6.97 10.73 153.94 5.310 0.008
gullies
Filename:DA1 thru DA7 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
8
Stru SW5 Vert. Dist, Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
B. Large gullies,diversions,and low 0.50 4.66 932.00 2.120 0.122
flowing streams
8. Large gullies,diversions,and low 3.80 17.62 463.68 5.840 0.022
flowing streams
8. Large gullies,diversions,and low 0.50 0.58 116.00 2.120 0.015
flowing streams
#7 1 Time of Concentration: 0.238
Filename:DA1 thru DA7 preconstruct_25 YR.sc4 Printed 03-18-2022

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f'nm w inap.inin Oamw1. 1 Gh..nh
Piedmont Lithium Carolinas, Inc.
Gaston County, North Carolina
Stormwater Management Plan
Emulsion Storage and Bulk Truck Parking Area
Drainage Area(s): 84, 85, 86, 88, 89, 90 and 91
Storm Event: 25 -Year/24 Hour
MMAA Project No, PLM 09
August, 2021
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename. EMULSION STORAGE AND TRUCK PARKING AREA 25 YR sc4 Printed 08-26-2a21

SEDCAD 4 for Windows
icon omn o­i. i e.k. h
Genera/Information
Storm Information:
Storm Type: NRCS Type II
Design Storm: 25 yr•24 hr
Rainfall Depth: 6.240 inches
Filename EMULSION STORAGE AND TRUCK PARKING AREA 25 YR sc4 Printed 08-26-2021

SEDCAD 4 for Windows
f-f4ri hf ioap win o*-*i. I Crh-i, ry
Structure Networking:
Type Stru (flows Stru Musk. K Musk.X DeSCription
# Into) # (hrs)
Null #1 =_> #9 0.000 0.000 DA-84(ST-21)
Null #2 =_> #1 0.000 0.000 DA-85(ROAD DITCH DA-85)
Null #3 =_> #8 0.000 0.000 DA-86(SB-17 and DIV DITCH DA-86)
Null #4 =-> #9 0.000 0.000 8A88(CLEANWATER DIVERSION DA-
Null #5 =_> #9 0.000 0.000 DA-89(UNDERDRAIN UD-5)
Null #6 =_> #7 0.000 0.000 DA-90(ROAD DITCH DA-90 and
CULVERT C-18)
Null #7 =_> #9 0.000 0.000 DA-91(ST-20)
Null #8 =_> #9 0.000 0.000 SS-17 SPILLWAY
Null #9 ==> End 0.000 0.000 NULL
#3
Null
#8
Null
le #6
Null
#7
Null
#5
Null
#4
Null
#1
Null
#1
Null
#9
Null
Filename EMULSION STORAGE AND TRUCK PARKING AREA 25 YR sc4 Printed 08-26-2021

SEDCAD 4 for Windows
r,,., A..h+loon ammnoz. 1. 1 c�ti..Mti
4
Structure Summary.-
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (ds) (ac-st)
#3 10.020 10.020 30.22 3.10
#8 0.000 10.020 30.22 3.10
#6 3.960 3.960 13.61 1.08
#7 0.500 4.460 15.77 1.28
#5 13.340 13.340 25.04 2.36
#4 2.870 2.870 8.22 0.63
#2 3.420 3.420 12.79 1.05
#1 1.730 5.150 18.87 1.54
#9 0.000 35.840 94.27 8.90
Piiename EMULSION STORAGE AND TRUCK PARKING AREA 25 YR sc4 Printed 08-26-2021

SSDCAD 4 for Windows
Inew.rinM loop win P-P. 1 cz,h k
5
Structure Detail:
Structure #3 N
DA-86(58-17 and DIV DITCH DA-86)
Structure #8(Null)
58-17 5PILL WA Y
Structure #6(Null)
DA-90(ROAD DITCH DA-90 and CULVERT C-18)
Structure #7(Null)
DA-91 (57--20)
Structure #5 Null
DA-89(UNDERDRAIN UD-5)
Structure #4 Null
DA-88(CLEANWATER DIVERSION DA-88)
'tructure #2 (Null)
DA-85(ROAD DITCH DA-85)
Structure #1 (Null)
DA-84(ST-21)
Structure # Nul
NULL
Filename EMULSION STORAGE AND TRUCK PARKING AREA 25 YR sc4 Printed 06-26-2021

SEDCAD 4 for Windows
Pn...rinht ioost ?nin p-j. I Crh...eh
6
Su6watershed Hydrology Detail:
Time of Peak Runoff
Stru SWS SWS Rrea Conc Musk K Curve Mu9k X UHS Discharge Volume
# # (ac) (hm) (hrs) Number (Cfs) (ac-ft
#3 1 10.020 0.216 0.000 O.ODO 86.000 M 30.22 3.101
71 10.020 30.22 3.101
#8 1 0.000 0.000 0.000 O.ODO 1.000 0.00 0.000
10.020 30.22 3.101
06 1 3.960 0.050 0.000 0.000 73.000 M 13.61 1.084
3.960 13.61 1.084
#7 1 0.500 0.031 0.000 0.000 86.000 M 2.17 0.192
4.460 15.77 1.277
#5 1 13.340 0.171 0.000 0.000 66.000 M 25.04 2.363
13.340 25.04 2.363
94 1 2.870 0.062 0.000 0.000 66.000 M 8.22 0.626
2.870 8.22 0.626
#2 1 3.420 0.051 0.000 ROOD 77.000 M 12.79 1.050
3.420 12.79 1.050
91 1 1.730 0.045 0.000 0.000 74.000 M 6.08 0.488
5.150 18.87 1.538
35.840 94.27 8.905
Su6watershed Time of Concentration Details;
Stru SWS Land Flow Condition Slope(%) Vert.Dist. Horiz. Dist. Velocity Time(hrs)
# # (ft) (ft) (fps)
#1 1 7. Paved area and small upland 8.24 35.59 432.00 5.770 0.020
gullies
5. Nearly bare and untitled,and 50.00 10.00 20.00 7.070 0.000
alluvial valley fans
5. Nearly bare and untilled,and 0.10 0.01 14.00 0.310 0.012
alluvial valley fans
8. Large gullies,diversions,and low 0.50 0.50 100.00 2.120 0.013
flowing streams
#1 1 Time of Concentration: 0.045
#2 1 7. Paved area and small upland 6.30 17.64 280.00 5.050 0.015
gullies
S. Nearly bare and unfilled,and 50.00 17.00 34.00 7.070 0.001
alluvial valley fans
Filename:EMULSION STORAGE AND TRUCK PARKING AREA 25 YR.sc4 Printed 08-26-2021

SEDDAD 4 for Windows
f nrw.rinhh 1COA win o*-n in I cm--k
7
5tru SW5 Land Flow Condition Slope(%) Vert• Dist. Horiz. Dist. Velocity Time(hrs)
# # (ft) (ft) (Fps)
B. Large gullies,diversions,and low 4.90 41.16 840.00 6.640 0.035
flowing streams
#2 1 Time of Concentration: 0.051
#3 1 S. Nearly bare and untilled,and 1.38 11.60 841.00 1.170 0.199
alluvial valley fans
B.Large gullies,diversions,and low 0.50 0.65 130.00 2.120 0.017
flowing streams
#3 1 Time of Concentration: 0.216
#4 1 7.Paved area and small upland 4.11 21.00 511.00 4.080 0.034
gullies
8.Large gullies,diversions,and low 3.42 19.32 565.00 5.540 0.028
flowing streams
#4 1 Time of Concentration: 0.062
#5 1 5. Nearly bare and untilled,and 1.07 3.21 300.00 1.030 0.080
alluvial valley fans
7. Paved area and small upland 4.72 49.08 1,040.00 4.370 0.066
gullies
8. Large gullies,diversions,and low 5.50 35.58 647.00 7.030 0.025
flowing streams
#5 1 Time of Concentration: 0.171
#6 1 7. Paved area and small upland 5.63 31.75 564.00 4.770 0.032
gullies
B. Large gullies,diversions,and low 9.54 40.54 425.00 9.260 0.012
flowing streams
8. Large gullies,diversions,and low 2.30 2.46 107.00 4.540 0.006
flowing streams
#6 1 Time of Concentration: 0.050
#7 1 7. Paved area and small upland 8.70 7.54 86.68 5.930 0.004
gullies
5. Nearly bare and unfilled,and 50.00 10.00 20.00 7.070 0.000
alluvial valley fans
5. Nearly bare and unfilled,and 0.10 0.01 14.00 0.310 0.012
alluvial valley fans
8. Large gullies,diversions,and low 0.50 0.58 117.00 2.120 0.015
flowing streams
#7 1 Time of concentration: 0.031
Filename:EMULSION STORAGE AND TRUCK PARKING AREA 25 YR.sc4 Printed 08-26-2021

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Drainage Calculations for Concentrate Operations,Piedmont Lithium Carolinas,Inc.
Gaston County,North Carolina
►►' ►► May2022
Topsoil Storage Pile
• Topsoil Storage Pile—See Mine Pit Area, East Pit for Pre-Construction Sedcad 4 Calculations
• Topsoil Storage Pile—Operational Sedcad 4 Calculations
MARSHALL MILLER&ASSOCIATES INc.

SEDCAD 4 for Windows
f nrnrrinht 1COf1.9lHfl Pemnla I Rrhumh
Piedmont Lithium Carolinas, Inc.
Gaston Countv,, North Carolina
Storm water Management Plan
Topsoil Storage Pile
Drainage Area(s): DA- 28 thru DA-39
Storm Event: 25 -Year/24-Hour
MM&A Project No. PLIT109
January 2021
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename-TOPSOIL PILE 25 YR.sc4 Printed 02-12-2021

SEDCAD 4 for Windows
f. mm ht ican_'1fl1n painala I CrYuwh ry
G
General Information
Storm Information:
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 Inches
Filename.TOPSOIL PILE_25 YR.sc4 Printed 02-12-2021

SEDCAD 4 for Windows
r:n mmt i aam AIT1f1 percale I QnH—h
S
Structure Networking:
Type Stru (flows Stru Musk. K Musk.X Description
# into) # (hrs)
Null #1 #10 0.000 0.000 DA-28
Null #2 =_> #10 0.000 0.000 DA-29
Null #3 =_> #4 0.000 0.000 DA•30
Null #4 =_> #10 0.000 0.000 DA-31
Null #5 =>> #11 0.000 0.000 DA-32
Null #6 ==> #11 0.000 0.000 DA-33
Null #7 ==> #9 0.000 0.000 DA-34
Null #8 =_> #11 0.000 0.000 DA-35
Null #9 =_> #8 0.000 0.000 DA-36
Null #10 _> #14 0.000 0.000 DA-38(Sediment Basin No. 11)
Null #11 =_> #14 0.000 0.000 1 DA-39(Sediment Basin No. 12)
Null #14 > End 0.000 0.000 Watershed
#7
Null
#9
Null
#8
Null
.. #6 -
Null
#S
Null
#11
Null
#3
Null
#4
Null
T #2
Null
#1
Null
01
#10 —
Null
#14
Null
Filename:TOPSOIL PILE 25 YR.sc4 Printed 02-12-2021

SEDCAD 4 for Windows
-'>M1h P-11 i CIF..I
4
Structure Summary:
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (ds) (ac-ft)
#7 1.170 1.170 5.07 0.45
#9 2.160 3.330 14.43 1.29
#8 0.220 3.550 15.38 1.37
#6 3.530 3.530 15.29 1.36
#5 5.170 5.170 22.40 2.00
#11 1.770 14.020 57.96 5.28
#3 1.040 1.040 4.51 0.40
#4 0.810 1.850 8.01 0.71
#2 1.870 1.870 8.10 0.72
#1 3.040 3.040 13.17 1.17
#10 0.740 7.500 32.49 2.89
#14 0.000 21.520 90.46 8.17
Filename:TOPSOIL PILE 25 YR.sc4 Printed 02-12-2021

SEDCAD 4 for Windows
r'n ,Ai hl iaam.9n1n P—w. I 2,h.-h
Structure Detail:
Structure #7(Null)
DA 34
Structure # ul�
DA 36
Structure #8 (Null)
DA 35
Structure #6(Null)
DA 33
5Irvcture #5(NuII
DA-32
Structure #11 (Null)
DA-39(Sediment Basin No. 12)
Structure #3 Nu1fl
DA-30
Structure #4(Nulls
DA-31
Structure #2(Null)
DA 29
Structure #1 (Null)
DA 28
Structure #10(Null)
DA 38(Sediment Basin No. 11)
Structure #1__. 4[Null,
Watershed
Filename:TOPSOIL PILE 25 YR,sc4 Printed 02-12-2021

SEDCAD 4 for Windows
r-inhr icon_%nin op-ia i Cnhu.ai
Subwaterslied Hydrology Detail:
SWS Area Time of Musk K Curve Peak Runoff
Stru SW5 Cone Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#7 1 1.170 0.009 0.000 0.000 86.000 M 5.07 0.452
1.170 5.07 0.452
#9 1 2.160 0.034 0.000 0.000 86.000 M 9.36 0.834
3.330 14.43 1.286
#8 1 0.220 0.009 0.000 0.000 86.000 M 0.95 0.084
3.550 15.38 1.369
#6 1 3.530 0.021 0.000 0.000 86.000 M 15.29 1.363
3.530 13.29 1.363
85 1 5.170 0.071 0.000 0.000 86.000 M 22.40 1.997
5.170 22.40 1.997
#11 1 1.770 0.265 0.000 0.000 86.000 M 5.07 0.547
14.020 57.96 5.276
#3 1 1.040 0.012 0.000 0.000 86.000 M 4.51 0.401
1.040 4.51 0.401
#4 1 0.810 0.048 0.000 0.000 86.000 M 3.51 0.312
1.850 8.01 0.714
#2 1 1.870 0.016 0.000 0.000 86.000 M 8.10 0.722
1.870 8.10 0.722
#1 1 3.040 0.075 0.000 0.000 86.000 M 13.17 1.174
1 3.040 13.17 1.174
#10 1 0.740 0.021 0.000 0.000 86.000 M 3.21 0.285
7.500 32.49 2.895
*14 �, 21.520 90.46 8.171
Subwatershed Time of Concentration Details:
Stru 5W5 Land Flow Condition Slope Vert. Dist. Horiz. Dist. Velocity Time(hrs)
ft) (ft) (fps)
#1 1 5.Nearly bare and untilled,and 50.00 19.50 39.00 7.070 0.001
alluvial valley fans
B.Large gullies,diversions, and low 1.00 1.07 108.00 3.000 0.010
flowing streams
Filename TOPSOIL PILE 25 YR.sc4 Printed 02-12-2021

SEDCAD 4 for Windows
7
Stru SWS Land Flow Condition Slope(9k) Vert.Dist. Horiz. Dist Velocity Time(hrs)
# # (ft) (ft) (fps)
8. Large gullies,diversions,and low 37.00 41.44 112.00 18.240 0.001
flowing streams
B. Large gullies,diversions,and low 1.50 12.61 841.00 3.670 0.063
flowing streams
#1 1 Time of Concentration: .0.075
#2 1 S. Nearly bare and untitled,and 10.00 5.60 56.00 3.160 0.004
alluvial valley fans
8.Large gullies,diversions,and low 1.00 1.12 112.00 3.000 0.010
flowing streams
8. Large gullies,diversions,and low flowing streams 37.00 70.67 191.00 16.240 0.002
#2 1 Time of Concentration: Y 0.016
#3 1 S.Nearly bare and unfilled,and 10 00 4.10 41.00 3.160 0.003
alluvial valley fans
8. Large gullies,diversions,and low 0.50 0.22 44.00 2.120 0.005
flowing streams
8. Urge gullies,diversions,and low 37.00 83.62 216.00 18.240 0.003
flowing streams
8. Large gullies,diversions,and low 1.00 0.14 14.00 3.000 0.001
Rowing streams
#3 1 Time of Concentration: 0.012
#4 1 5. Nearly bare and untitled,and 50.00 18.00 36.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low flowing streams 1.20 6.79 566.00 3.280 0.047
#4 1 Time of Concentration: 0.0413
#5 1 S. Nearly bare and untitled,and 10.00 11.40 114.00 3.160 0.010
alluvial valley fans
8. Large gullies,diversions,and low 1.00 0.79 79.00 3.000 0.007
flowing streams
B. Large gullies,diversions,and low 37.00 96.57 261.00 18.240 0.003
flowing streams
B. Large gullies,diversions,and low 2.30 19.50 848.00 4.540 0.051
flowing streams
#5 1 Time of Concentration: 0.071
#6 1 5. Nearly bare and untitled,and 10.00 4.00 40.00 3.160 0.003
alluvial valley fans
B. Large gullies,diversions,and low 1.00 1.59 160.00 3.000 0.014
flowing streams
B. Large gullies,diversions,and low flowing streams 37.00 100.27 271.00 18.240 0.004
#6 1 Time of Concentration: 0.021
#7 1 S. Nearly bare and untitled,and 10.00 4.80 48.00 3.160 0.004
alluvial valley fans
B. Large gullies,diversions,and low 1.00 0.39 39.00 3.000 0.003
flowing streams
8. Large gullies,diversions,and low 37.00 56.61 153.00 18.240 0.002
flowing streams
#7 1 Time of Concentration: 0.009
Filename;TOPSOIL PILE 25 YFI.sc4 Printed 02-12-2021

SEDGAD 4 for Windows
8
5tru SWS Land Pow Condition Slope(%) Vert.Dist. Horiz.Dist. Velocity Time(hrs)
# # (ft) (ft) (fps)
#8 1 S.Nearly bare and untilled,and 50.00 20.50 41.00 7.070 0.001
alluvial valley fans
8.Large gullies,diversions,and low 5.10 10.60 208.00 6.770 0.008
Flowing streams
#8 1 Time of Concentration: _ 0.009
#9 1 5.Nearly bare and untilled,and 10.00 8.20 82.00 3.160 0.007
alluvial valley fans
8.Large gullies,diversions,and low 8.00 68.24 853.00 8.480 0.027
Flowing streams
#9 1 Time of Concentration: 0.034
#10. 1 5.Nearly bare and untilled,and 50.00 19.50 39.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 0.50 0.69 139.00 2.120 0.018
flowing streams
8. Large gullies,diversions,and low 3.00 1.16 39.00 5.190 0.002
flowing streams
#10 1 Time of Concentration: 0.021
#il 1 5• Nearly bare and unfilled,and alluvial valley fans 50.00 20.O0 40.00 7.070 0.001
S. Nearly bare and unfilled,and 0.10 0.27 270.00 0.310 0.241
alluvial valley fans
B. Large gullies,diversions,and low 40.00 15.60 39.00 18.970 0.000
flowing streams
B. Large gullies,diversions,and low 0.50 0.73 147.00 2.120 0.019
flowing streams
8. Large gullies,diversions,and low 3.00 2.33 78.00 5.190 0.004
flowing streams
#I 1 Time of Concentration: ^^ 0.265
Filename;TOPSOIL PILE..25 YR.sc4 Printed 02-12-2021

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Drainage Calculations for Concentrate Operations,Piedmont Lithium Carolinas,Inc.
Gaston County,North Carolina
►►' ►► May2022
Mine Pit Area
• Mine Pit Area — Pre-Construction Sedcad 4 Calculations
• Sediment Basin No. 18— Pre-Construction and Operational Sedcad 4 Calculations
MARSHALL MILLER&ASSOCIATES INc.

SEDCAD 4 for Windows
!`nn,..inh1 10oR_7r11�Pamela 1 Ghuoh
Piedmont Lithium Carolinas., Inc.
Gaston County., North Carolina
Stormwater Management Plan
South Pit (Pre-Construction Phase)
Storm Event: 25 -Year/ 24-Hour
MM&A Project No. PUT109
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename: DA58 thru DA68 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
General Information
Storm Information:
Storm Type: NRCS Type 11
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename:DA58 thru DA68 preconslruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
r`n.,,m; h#iooa-,)nin a.,,,,vi. i c�ti,.nti
Structure Networking:
Type Stru (flows Stru Musk. K Musk.X Description
# into) # (hrs)
Null #1 =_> #12 0.000 0.000 DA-58(SK41)
Null #2 #1 0.000 0.000 DA-59
Null #3 =_> #1 0.000 0.000 DA-60
Null #4 =_> #12 0.000 0.000 DA-61 (IN PIT5TORAGE)
Null #5 =_> #12 0.000 0.000 DA-62(SK42)
Null #6 =_> #12 0.000 0.000 DA-63(SK43)
Null #7 =_> #12 0.000 0.000 DA-64(SK44)
Null #8 =_> #12 0.000 0.000 DA-65(SP PIT POND)
Null #9 =_> #11 0.000 0.000 DA-66
Null #10 =_> #11 0.000 0.000 DA-67
Null #11 =_> #12 0.000 0.000 DA-68(SK45)
Null #12 ==> End 0.000 0.000 DISCHARGE OFF SITE
#10
Null
#9
Null
4i #11
Null
16, #8
Null
#7
Null
4r #6
Null
4i #5
Null
#4
Null
4i #3
Null
#2
Null
�i #1
Null
#12
Null
Filename: DA58 thru DA68 preconstruct_25 YR_sc4 Printed 03-18-2022

SEDCAD 4 for Windows
Structure Summary:
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (S) (ac-ft)
#10 2,930 2.930 12.69 1.13
#9 1.430 1.430 6.20 0.55
#11 0.160 4.520 19.58 1.74
#8 23.780 23.780 71.93 7.35
#7 1.380 1.380 5.98 0.53
#6 8.060 8.060 34.92 3.11
#5 9.300 9.300 40.29 .3.59
#4 9.300 9.300 40.29 3.59
#3 3.320 3.320 14.38 1.28
#2 2.780 2.780 12.04 1.07
#1 0.310 6.410 27.77 2.47
#12 0.870 63.620 236.10 22.39
Filename:DA58 thru DA68 preconstruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
f nrnninM�OOti_9M 11 Por.ale I CrM.roh
Structure Detail:
Structure #10 Null)
DA-67
Structure #9(Nulls
DA-66
Structure #1 1 (Null)
DA-68(SK45)
Structure #8 68LU19
DA-65(SP PIT POND)
Structure #7.(Null)
DA-64 (SK44)
Structure #6(Null)
DA-63(SK43)
Structure #5(Null)
DA-62 (SK42)
tructure #4(Null
DA-61 (IN PIT STORAGE)
Structure #3Nrll
DA-60
Structure #2 LNtll)
DA-59
Structure #1 (Null)
DA-58(SK41)
Structure #12 Null
DISCHARGE OFF SITE
Filename: DA58 thru DA68 preconstruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
.1--nKt 1Quk wiIf'.P.-ia [ Qrh..+ K
6
Subwatershed Hydrology Detail:
Time of Musk K Curve Peak Runoff
5tru SW5 5WS Area Conc Musk X UHS Discharge Volume
# # (ac) (hrs) (hrs} Number (S) (ac-ft)
#10 1 2.930 0.030 0.000 0.000 86.000 M 12.69 1.131
71 2.930 12.69 1.131
#9 1 1.430 0.033 0.000 0.000 86.000 M 6.20 0.552
1.430 6.20 0.552
oil 1 0.160 0.016 0.000 0.000 86.000 M 0.69 0.061
4.520 19.58 1,744
#9 1 23.780 0.212 0.000 0.000 86.000 M 71.93 7.347
23.780 71.93 7.347
!7 1 1.380 0.041 0.000 0.000 86.000 M 5.98 0.533
71 1.380 5.98 0.533
#fi 1 8.060 0.069 0.000 0.000 86.000 M 34.92 3.113
8.060 34.92 3.113
#5 1 9.300 0.122 0.000 0.000 86.000 M 40.29 3.592
9.300 �0 7- 40.29 3.592
#4 1 9.300 0.000 OA00 0.000 86.000 M 40.29 3.592
9.300 40.29 3.592
93 1 3.320 0.085 OA00 0.000 86.000 M 14.38 1.282
71 3.320 14.38 1.282
02 1 2.780 0.106 0.000 0.000 86.000 M 12.04 1.074
71 2.780 0p 12.04 1.074
#1 1 0.310 0.022 0.000 0.000 86.000 M 1.34 0.119
6.410 27.77 2.474
#12 63.620 236.10 22.394
Subwatershed Time a Concentration Details;
Stru SWS Land Flow Condition Slope(%) Vert. Dist. Horiz. Dist. Velocity Time(hrs)
# # (ft) (ft) (fps)
#1 1 7.Paved area and small upland 12.20 14.27 117.00 7.030 0.004
gullies
8. Large gullies,diversions,and low 50.00 13.00 26.00 21.210 0.000
flowing streams
Filename:DA58 thru DA68 preconstruct 25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
r4„r„*•,hf 1°OA_7/11rt P�mnln I Crh.rsh
7
Stru SWS Vert. Dist. Horiz. Dist. Velocity i
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
B.Large gullies,diversions,and low 0.10 0.06 61.00 0.940 0.018
flowing streams
#1 1 Time of Concentration: 0.022
92 1 5. Nearly bare and untitled,and 35.00 19.94 57.00 5.910 0.002
alluvial valley fans
8. Large gullies,diversions,and low 3.20 64.64 2,020.00 5.360 0,104
flowing streams
#2 1 Time of Concentration: 0.106
#3 1 5. Nearly bare and untilled,and 50.00 15.00 30.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 4.00 73.19 1,830.00 6.000 0.084
flowing streams
#3 1 Time of Concentration: 0.085
#5 1 7. Paved area and small upland 7.68 38.63 503.00 5.570 0.025
gullies
B. Large gullies,diversions,and low 0.50 2.94 589.00 2.120 0.077
flowing streams
8. Large gullies,diversions,and low 50.00 34.50 69.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.07 71.00 0.940 0.020
flowing streams
#5 1 Time of Concentration: 0.122
#6 1 7. Paved area and small upland 10.60 50.45 476.00 6.550 0.020
gullies
B. Large gullies,diversions,and tow 2.70 11.20 415.00 4.920 0,023
flowing streams
B. Large gullies,diversions,and low 0.10 0.09 90.00 0.940 0.026
flowing streams
#6 1 Time of Concentration: 0.069
#7 1 7. Paved area and small upland 22.00 55.66 253.00 9.440 0.007
gullies
B. Large gullies,diversions,and low 0.50 0.89 178.00 2.120 0,023
flowing streams
B. Large gullies,diversions,and low 50.00 5.50 11.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.04 39.99 0.940 0.011
flowing streams
#7 1 Time of Concentration: 0.041
#8 1 7. Paved area and small upland 16.40 62.81 383.00 8.150 0.013
gullies
B. Large gullies,diversions,and low 1.00 17.69 1,769.00 3.000 0.163
flowing streams
8. Large gullies,diversions,and low 50.00 10.50 21.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.12 124.00 0.940 0.036
flowing streams
#8 1 Time of Concentration: 0.212
#9 1 5. Nearly bare and untilled,and 39.00 18.33 47.00 6.240 0.002
alluvial valley fans 1
Filename:DA58 thru DA68 preconstruct_25 Yft_sc4 Printed 03-18-2022

SEDCAD 4 for Windows
Stru SW5 Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies,diversions,and low 8.85 88.67 1,002.00 8.920 0.031
Flowing streams
#9 1 Time of Concentration: 0.033
#10 1 5. Nearly bare and untilled, and 50.00 16.00 32.00 7.070 0.001
alluvial valley fans
B. Large gullies,diversions,and low g 40 92.96 989.00 9.190 0.029
flowing streams
#10 1 Time of Concentration: 0.030
#11 1 B. Large gullies,diversions,and low 5040 4 50 940 21.210 0.000
flowing streams
B. Large gullies, diversions,and low 0.10 0.05 57.00 0.940 0.016
flowing streams
#11 1 Time of Concentration: 0.016
Filename:DA58 thru DA68 preconstruct_25 YR.sc4 Printed 03-18-2022

SEDCAD 4 for Windows
r'n ...inhf IQaR_9l19O Pamela I Q,h,e h
1
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Stormwater Management Plan
East Pit (Pre-Construction Phase)
Storm Event; 25 -Year/ 24-Hour
MM&A Project No, PLIT1O9
March 2022
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #1 =_> #41 0.000 0.000 DA-69(SK46)
Null #2 =_> #1 0.000 0.000 DA-70
Null #3 =_> #1 0.000 0.000 DA-71
Null #4 =_> #41 0.000 0.000 DA-72(SK47)
Null #6 =_> #41 0.000 0.000 DA-74(SK48)
Null #7 =_> #41 0.000 0.000 DA-75(SK49)
Null #8 =_> #41 0.000 0.000 DA-76(SK50)
Null #9 =_> #41 0.000 0.000 DA-77(SK51)
Null #10 =_> #12 0.000 0.000 DA-78
Null #11 =_> #12 0.000 0.000 DA-79
Null #12 =_> #41 0.000 0.000 DA-80(SK52)
Null #13 =_> #12 0.000 0.000 DA-81
Null #14 =_> #41 0.000 0.000 DA-82(SK53)
Null #15 =_> #16 0.000 0.000 DA-83
Null #16 =_> #18 0.000 0.000 DA-84
Null #17 =_> #18 0.000 0.000 DA-85
Null #18 =_> #41 0.000 0.000 DA-86(SK54)
Null #19 =_> #41 0.000 0.000 DA-87(SK55)
Null #20 =_> #21 0.000 0.000 DA-88
Null #21 =_> #22 0.000 0.000 DA-89
Null #22 =_> #41 0.000 0.000 DA-90(SK56)
Null #23 =_> #22 0.000 0.000 DA-91
Null #24 =_> #41 0.000 0.000 DA-92(SK57)
Null #25 =_> #24 0.000 0.000 DA-93
Null #26 =_> #25 0.000 0.000 DA-94
Null #27 =_> #24 0.000 0.000 DA-95
Null #28 =_> #41 0.000 0.000 DA-96(EP PIT POND)
Null #29 =_> #41 0.000 0.000 DA-97(EP PIT POND)
Null #30 =_> #41 0.000 0.000 DA-98(SK58)
Null #31 =_> #41 0.000 0.000 DA-99(SB12)
Null #32 =_> #41 0.000 0.000 DA-100(ST112)
Null #33 =_> #31 0.000 0.000 DA-101
Null #34 =_> #36 0.000 0.000 DA-102
Null #35 =_> #36 0.000 0.000 DA-103
Null #36 =_> #41 0.000 0.000 DA-104(SK59)
Null #37 =_> #38 0.000 0.000 DA-105
Null #38 =_> #41 0.000 0.000 DA-106(SB11)
Null #39 =_> #41 0.000 0.000 DA-107(SK60)
Null #40 =_> #41 0.000 0.000 DA-108(SK61)
Null #41 =_> End 0.000 0.000 DISCHARGE OFF SITE
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
4
#40
Null
#39
Null
#37
Null
#38
Null
#35
Null
#34
Null
#36
Null
#32
Null
#33
Null
#31
NUII
#30
NU/1
#29
NU/1
#28
NUII
#27
NU/1
#26
Null
#25
Null
#24
Null
#23
Null
#20
Null
#21
Null
#22
Null
#19
Null
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
5
#17
Nu//
#15
Nu//
#16
Nu//
#18
Null
#14
Null
#13
Null
#11
Nu//
#10
Nu//
#12
Null
#9
Nu//
#8
Null
#7
Null
#6
Nu//
#4
Null
#3
Null
#2
Null
#1
Null
#41
Null
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
6
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#40 2.300 2.300 9.96 0.89
#39 2.080 2.080 9.01 0.80
#37 1.610 1.610 6.97 0.62
#38 5.690 7.300 31.62 2.82
#35 0.530 0.530 2.30 0.20
#34 1.490 1.490 6.45 0.58
#36 0.410 2.430 10.53 0.94
#32 0.850 0.850 3.68 0.33
#33 5.690 5.690 24.65 2.20
#31 16.850 22.540 76.42 7.49
#30 9.090 9.090 39.38 3.51
#29 87.440 87.440 242.41 27.02
#28 60.890 60.890 263.79 23.52
#27 2.540 2.540 11.00 0.98
#26 3.720 3.720 16.12 1.44
#25 2.270 5.990 25.95 2.31
#24 1.460 9.990 43.28 3.86
#23 0.230 0.230 1.00 0.09
#20 0.950 0.950 4.12 0.37
#21 1.750 2.700 11.70 1.04
#22 0.360 3.290 14.25 1.27
#19 9.800 9.800 42.46 3.78
#17 2.550 2.550 11.05 0.98
#15 4.980 4.980 21.57 1.92
#16 1.560 6.540 28.33 2.53
#18 0.160 9.250 40.07 3.57
#14 9.500 9.500 41.16 3.67
#13 3.210 3.210 13.91 1.24
#11 4.470 4.470 19.36 1.73
#10 1.120 1.120 4.85 0.43
#12 0.550 9.350 40.51 3.61
#9 8.840 8.840 38.30 3.41
#8 3.890 3.890 12.35 1.22
#7 9.540 9.540 41.33 3.68
#6 9.990 9.990 43.28 3.86
#4 1.260 1.260 5.46 0.49
#3 1.700 1.700 7.36 0.66
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
f—,,inh4 1QQR_?nln P-1c I Qrh,—h
7
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#2 1.090 1.090 4.72 0.42
#1 0.440 3.230 13.99 1.25
#41 0.000 282.850 1,043.57 100.98
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crheh
8
Structure Detail;
Structure #40 (Null)
DA-108(51661)
Structure #39 (Null)
DA-107(51(60)
Structure #37(Null)
DA-105
Structure #38(Null)
DA-106(5B11)
Structure #35(Null)
DA-103
Structure #34(Null)
DA-102
Structure #36(Null)
DA-104 (SK59)
Structure #32 (Null)
DA-100 (ST112)
Structure #33 (Null)
DA-101
Structure #31 (Null)
DA-99 (SB12)
Structure #30 (Null)
DA-98(SK58)
Structure #29 (Null)
DA-97(EP PIT POND)
Structure #28(Null)
DA-96(EP PIT POND)
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crheh
9
Structure #27(Null)
DA-95
Structure #26(Null)
DA-94
Structure #25(Null)
DA-93
Structure #24
DA-92 (SK57)
Structure #23
DA-91
Structure #20
DA-88
Structure #21 (Null)
DA-89
Structure #22 (Null)
DA-90 (SK56)
Structure #19 (Null)
DA-87(SK55)
Structure #17
DA-85
Structure #15
DA-83
Structure #16(Null)
DA-84
Structure #18(Null)
DA-86(SK54)
Structure #14(Null)
DA-82 (SK53)
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crheh
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Structure #13
DA-81
Structure #11 (Null)
DA-79
Structure #10 (Null)
DA-78
Structure #12
DA-80 (SK52)
Structure #9
DA-77(SK51)
Structure #8(Null)
DA-76(5K50)
Structure #7(Null)
DA-75(SK49)
Structure #6(Null)
DA-74 (SK48)
Structure #4 (Null)
DA-72 (SK47)
Structure #3 (Null)
DA-71
Structure #2
DA-70
Structure #1 (Null)
DA-69 (SK46)
Structure #41 (Null)
DISCHARGE OFF SITE
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP-9(19(1 Pamela I Q,h,e h
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Subwatershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) (hrs) Number (cfs) (ac-ft
#40 1 2.300 0.056 0.000 0.000 86.000 M 9.96 0.888
2.300 9.96 0.888
#39 1 2.080 0.032 0.000 0.000 86.000 M 9.01 0.803
2.080 9.01 0.803
#37 1 1.610 0.058 0.000 0.000 86.000 M 6.97 0.622
1.610 6.97 0.622
#38 1 5.690 0.071 0.000 0.000 86.000 M 24.65 2.197
7.300 31.62 2.819
#35 1 0.530 0.015 0.000 0.000 86.000 M 2.30 0.204
0.530 2.30 0.204
#34 1 1.490 0.077 0.000 0.000 86.000 M 6.45 0.575
1.490 6.45 0.575
#36 1 0.410 0.014 0.000 0.000 86.000 M 1.78 0.158
2.430 10.53 0.937
#32 1 0.850 0.025 0.000 0.000 86.000 M 3.68 0.328
0.850 3.68 0.328
#33 1 5.690 0.079 0.000 0.000 86.000 M 24.65 2.197
5.690 24.65 2.197
#31 1 16.850 0.163 0.000 0.000 86.000 M 53.48 5.292
22.540 76.42 7.489
#30 1 9.090 0.031 0.000 0.000 86.000 M 39.38 3.510
9.090 39.38 3.510
#29 1 87.440 0.317 0.000 0.000 86.000 M 242.41 27.018
87.440 242.41 27.018
#28 1 60.890 0.102 0.000 0.000 86.000 M 263.79 23.515
60.890 263.79 23.515
#27 1 2.540 0.024 0.000 0.000 86.000 M 11.00 0.981
2.540 11.00 0.981
#26 1 3.720 0.015 0.000 0.000 86.000 M 16.12 1.437
3.720 16.12 1.437
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP-9(19(1 Pamela I Q,h,e h
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SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#25 1 2.270 0.055 0.000 0.000 86.000 M 9.83 0.876
5.990 25.95 2.313
#24 1 1.460 0.030 0.000 0.000 86.000 M 6.32 0.564
9.990 43.28 3.857
#23 1 0.230 0.010 0.000 0.000 86.000 M 1.00 0.088
0.230 1.00 0.088
#20 1 0.950 0.018 0.000 0.000 86.000 M 4.12 0.366
0.950 4.12 0.366
#21 1 1.750 0.022 0.000 0.000 86.000 M 7.58 0.676
2.700 11.70 1.042
#22 1 0.360 0.019 0.000 0.000 86.000 M 1.56 0.138
3.290 14.25 1.268
#19 1 9.800 0.109 0.000 0.000 86.000 M 42.46 3.785
9.800 42.46 3.785
#17 1 2.550 0.036 0.000 0.000 86.000 M 11.05 0.985
2.550 11.05 0.985
#15 1 4.980 0.039 0.000 0.000 86.000 M 21.57 1.923
4.980 21.57 1.923
#16 1 1.560 0.064 0.000 0.000 86.000 M 6.76 0.602
6.540 28.33 2.525
#18 1 0.160 0.014 0.000 0.000 86.000 M 0.69 0.061
9.250 40.07 3.571
#14 1 9.500 0.103 0.000 0.000 86.000 M 41.16 3.669
9.500 41.16 3.669
#13 1 3.210 0.057 0.000 0.000 86.000 M 13.91 1.240
3.210 13.91 1.240
#11 1 4.470 0.086 0.000 0.000 86.000 M 19.36 1.726
4.470 19.36 1.726
#10 1 1.120 0.040 0.000 0.000 86.000 M 4.85 0.432
1.120 4.85 0.432
#12 1 0.550 0.016 0.000 0.000 86.000 M 2.38 0.212
9.350 40.51 3.610
#9 1 8.840 0.089 0.000 0.000 86.000 M 138.30 3.414
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
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SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
8.840 38.30 3.414
#8 1 3.890 0.154 0.000 0.000 86.000 M 12.35 1.222
3.890 12.35 1.222
#7 1 9.540 0.077 0.000 0.000 86.000 M 41.33 3.684
9.540 41.33 3.684
#6 1 9.990 0.099 0.000 0.000 86.000 M 43.28 3.858
9.990 43.28 3.858
#4 1 1.260 0.051 0.000 0.000 86.000 M 5.46 0.486
1.260 5.46 0.486
#3 1 1.700 0.033 0.000 0.000 86.000 M 7.36 0.656
1.700 7.36 0.656
#2 1 1.090 0.031 0.000 0.000 86.000 M 4.72 0.421
1.090 4.72 0.421
#1 1 0.440 0.021 0.000 0.000 86.000 M 1.91 0.169
3.230 13.99 1.246
#41 282.850 1,043.57 100.977
Subwatershed Time of Concentration Details;
Stru SWS Land Flow Condition Slope(%) Vert. Dist. Horiz. Dist. Velocity Time(hrs)
# # (ft) (ft) (fps)
#1 1 5. Nearly bare and untilled, and 50.00 16.00 32.00 7.070 0.001
alluvial valley fans
5. Nearly bare and untilled,and 22.00 17.82 81.00 4.690 0.004
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.05 55.00 0.940 0.016
flowing streams
#1 1 Time of Concentration: 0.021
#2 1 5. Nearly bare and untilled,and 50.00 17.50 35.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 8.50 80.75 950.00 8.740 0.030
flowing streams
8. Large gullies,diversions,and low 50.00 33.50 67.00 21.210 0.000
flowing streams
#2 1 Time of Concentration: 0.031
#3 1 5. Nearly bare and untilled,and 41.00 16.81 41.00 6.400 0.001
alluvial valley fans
8. Large gullies,diversions,and low 7.70 74.84 972.00 8.320 0.032
flowing streams
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
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Stru SWS o Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(/o) (ft) (ft) (fps) Time(hrs)
#3 1 Time of Concentration: 0.033
#4 1 5. Nearly bare and untilled,and 50.00 17.50 35.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 5.40 47.03 871.00 6.970 0.034
flowing streams
8. Large gullies,diversions,and low 50.00 34.00 68.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.05 56.00 0.940 0.016
flowing streams
#4 1 Time of Concentration: 0.051
#6 1 7. Paved area and small upland 4.87 44.51 914.00 4.440 0.057
gullies
8. Large gullies, diversions, and low 2.21 14.16 641.00 4.450 0.040
flowing streams
8. Large gullies,diversions,and low 10.00 8.30 83.00 9.480 0.002
flowing streams
#6 1 Time of Concentration: 0.099
#7 1 7. Paved area and small upland 6.32 42.91 679.00 5.060 0.037
gullies
8. Large gullies, diversions, and low 2.13 7.71 362.00 4.370 0.023
flowing streams
8. Large gullies,diversions,and low 10.00 10.00 100.00 9.480 0.002
flowing streams
8. Large gullies, diversions, and low 0.10 0.05 54.00 0.940 0.015
flowing streams
#7 1 Time of Concentration: 0.077
#8 1 7. Paved area and small upland 2.40 8.52 355.00 3.110 0.031
gullies
8. Large gullies,diversions,and low 0.50 2.46 492.00 2.120 0.064
flowing streams
7. Paved area and small upland 5.60 29.23 521.96 4.760 0.030
gullies
8. Large gullies,diversions,and low 0.50 1.12 224.00 2.120 0.029
flowing streams
#8 1 Time of Concentration: 0.154
#9 1 8. Large gullies,diversions,and low 2.30 26.58 1,156.00 4.540 0.070
flowing streams
8. Large gullies,diversions,and low 7.80 11.38 146.00 8.370 0.004
flowing streams
8. Large gullies,diversions,and low 50.00 1.50 3.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.05 54.00 0.940 0.015
flowing streams
#9 1 Time of Concentration: 0.089
#10 1 5. Nearly bare and untilled,and 35.00 15.40 44.00 5.910 0.002
alluvial valley fans
8. Large gullies,diversions,and low 4.20 35.40 843.00 6.140 0.038
flowing streams
8. Large gullies,diversions,and low 13.00 3.90 30.00 10.810 0.000
flowing streams
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
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Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 50.00 13.00 26.00 21.210 0.000
flowing streams
#10 1 Time of Concentration: 0.040
#11 1 7. Paved area and small upland 2.60 13.70 527.00 3.240 0.045
gullies
8. Large gullies,diversions,and low 3.60 30.31 842.00 5.690 0.041
flowing streams
8. Large gullies,diversions,and low 50.00 16.00 32.00 21.210 0.000
flowing streams
#11 1 Time of Concentration: 0.086
#12 1 5. Nearly bare and untilled,and 50.00 17.50 35.00 7.070 0.001
alluvial valley fans
5. Nearly bare and untitled, and 50.00 20.00 40.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.05 50.00 0.940 0.014
flowing streams
#12 1 Time of Concentration: 0.016
#13 1 7. Paved area and small upland 6.10 40.50 664.00 4.970 0.037
gullies
8. Large gullies, diversions, and low 0.50 0.76 153.00 2.120 0.020
flowing streams
#13 1 Time of Concentration: 0.057
#14 1 7. Paved area and small upland 4.50 21.06 468.00 4.270 0.030
gullies
8. Large gullies, diversions, and low 1.34 9.23 689.00 3.470 0.055
flowing streams
8. Large gullies,diversions,and low 50.00 5.00 10.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.06 63.00 0.940 0.018
flowing streams
#14 1 Time of Concentration: 0.103
#15 1 7. Paved area and small upland 6.30 23.62 375.00 5.050 0.020
gullies
8. Large gullies,diversions,and low 4.80 15.36 320.00 6.570 0.013
flowing streams
8. Large gullies,diversions,and low 4.00 5.60 140.00 6.000 0.006
flowing streams
#15 1 Time of Concentration: 0.039
#16 1 7. Paved area and small upland 8.20 15.25 186.00 5.760 0.008
gullies
8. Large gullies,diversions,and low 2.88 29.69 1,031.00 5.090 0.056
flowing streams
#16 1 Time of Concentration: 0.064
#17 1 7. Paved area and small upland 6.20 27.77 448.00 5.010 0.024
gullies
8. Large gullies,diversions,and low 4.20 11.80 281.00 6.140 0.012
flowing streams
8. Large gullies,diversions,and low 50.00 9.00 18.00 21.210 0.000
flowing streams
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
16
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#17 1 Time of Concentration: 0.036
#18 1 5. Nearly bare and untilled, and 50.00 21.50 43.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 0.10 0.04 47.00 0.940 0.013
flowing streams
#18 1 Time of Concentration: 0.014
#19 1 7. Paved area and small upland 10.15 33.29 328.00 6.410 0.014
gullies
8. Large gullies, diversions, and low 1.44 17.89 1,243.00 3.600 0.095
flowing streams
#19 1 Time of Concentration: 0.109
#20 1 7. Paved area and small upland 9.40 6.39 68.00 6.170 0.003
gullies
8. Large gullies, diversions, and low 4.80 17.28 360.00 6.570 0.015
flowing streams
#20 1 Time of Concentration: 0.018
#21 1 5. Nearly bare and untilled, and 50.00 16.50 33.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 6.58 39.48 600.00 7.690 0.021
flowing streams
#21 1 Time of Concentration: 0.022
#22 1 5. Nearly bare and untilled, and 50.00 51.50 103.00 7.070 0.004
alluvial valley fans
8. Large gullies, diversions, and low 0.10 0.05 51.00 0.940 0.015
flowing streams
#22 1 Time of Concentration: 0.019
#23 1 5. Nearly bare and untilled, and 50.00 17.50 35.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 3.80 7.33 193.00 5.840 0.009
flowing streams
8. Large gullies, diversions, and low 50.00 16.00 32.00 21.210 0.000
flowing streams
#23 1 Time of Concentration: 0.010
#24 1 5. Nearly bare and untilled, and 50.00 14.00 28.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 17.33 25.47 147.00 12.480 0.003
flowing streams
8. Large gullies, diversions, and low 50.00 6.00 12.00 21.210 0.000
flowing streams
8. Large gullies, diversions, and low 0.10 0.08 89.00 0.940 0.026
flowing streams
#24 1 Time of Concentration: 0.030
#25 1 5. Nearly bare and untilled, and 50.00 13.50 27.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 3.87 44.89 1,160.00 5.900 0.054
flowing streams
#25 1 Time of Concentration: 0.055
#26 1 7. Paved area and small upland 12.80 31.48 246.00 7.200 0.009
gullies
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...i hf IGOP_9(19(1 Pamela I Q,h,e h
17
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 7.80 13.10 168.00 8.370 0.005
flowing streams
8. Large gullies,diversions,and low 15.00 11.55 77.00 11.610 0.001
flowing streams
#26 1 Time of Concentration: 0.015
#27 1 7. Paved area and small upland 8.23 37.68 457.84 5.770 0.022
gullies
8. Large gullies,diversions,and low 17.00 17.00 100.00 12.360 0.002
flowing streams
#27 1 Time of Concentration: 0.024
#28 1 7. Paved area and small upland 6.80 130.90 1,925.00 5.240 0.102
gullies
#28 1 Time of Concentration: 0.102
#29 1 7. Paved area and small upland 2.64 68.87 2,609.00 3.270 0.221
gullies
8. Large gullies,diversions,and low 1.10 6.78 617.00 3.140 0.054
flowing streams
8. Large gullies, diversions, and low 50.00 47.50 95.00 21.210 0.001
flowing streams
8. Large gullies, diversions, and low 0.10 0.14 140.00 0.940 0.041
flowing streams
#29 1 Time of Concentration: 0.317
#30 1 7. Paved area and small upland 17.50 73.67 421.00 8.420 0.013
gullies
8. Large gullies, diversions, and low 3.70 13.94 377.00 5.770 0.018
flowing streams
#30 1 Time of Concentration: 0.031
#31 1 7. Paved area and small upland 10.50 72.97 695.00 6.520 0.029
gullies
8. Large gullies,diversions,and low 1.10 5.74 522.00 3.140 0.046
flowing streams
8. Large gullies, diversions, and low 0.50 0.42 84.00 2.120 0.011
flowing streams
8. Large gullies,diversions,and low 0.10 0.26 261.00 0.940 0.077
flowing streams
#31 1 Time of Concentration: 0.163
#32 1 7. Paved area and small upland 8.10 4.05 50.00 5.720 0.002
gullies
8. Large gullies,diversions,and low 1.70 5.64 332.00 3.910 0.023
flowing streams
#32 1 Time of Concentration: 0.025
#33 1 7. Paved area and small upland 6.73 39.30 584.00 5.220 0.031
gullies
8. Large gullies,diversions,and low 2.84 25.07 883.00 5.050 0.048
flowing streams
#33 1 Time of Concentration: 0.079
#34 1 5. Nearly bare and untitled, and 50.00 18.00 36.00 7.070 0.001
alluvial valley fans
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
18
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies, diversions, and low 1.35 12.90 956.00 3.480 0.076
flowing streams
#34 1 Time of Concentration: 0.077
#35 1 5. Nearly bare and untilled,and 50.00 18.00 36.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 2.44 5.80 238.00 4.680 0.014
flowing streams
#35 1 Time of Concentration: 0.015
#36 1 7. Paved area and small upland 8.20 11.07 135.00 5.760 0.006
gullies
8. Large gullies,diversions,and low 50.00 5.50 11.00 21.210 0.000
flowing streams
8. Large gullies,diversions, and low 0.10 0.02 28.00 0.940 0.008
flowing streams
#36 1 Time of Concentration: 0.014
#37 1 7. Paved area and small upland 8.01 24.99 312.00 5.690 0.015
gullies
8. Large gullies, diversions, and low 1.40 7.75 554.00 3.540 0.043
flowing streams
#37 1 Time of Concentration: 0.058
#38 1 7. Paved area and small upland 6.45 28.83 447.00 5.110 0.024
gullies
8. Large gullies,diversions,and low 2.64 22.20 841.00 4.870 0.047
flowing streams
#38 1 Time of Concentration: 0.071
#39 1 7. Paved area and small upland 8.30 26.39 318.00 5.790 0.015
gullies
8. Large gullies,diversions, and low 4.87 20.55 422.00 6.620 0.017
flowing streams
#39 1 Time of Concentration: 0.032
#40 1 7. Paved area and small upland 10.72 8.68 81.00 6.590 0.003
gullies
8. Large gullies,diversions,and low 1.37 7.02 513.00 3.510 0.040
flowing streams
8. Large gullies, diversions, and low 0.10 0.04 47.00 0.940 0.013
flowing streams
#40 1 Time of Concentration: 0.056
Filename: DA69 thru DA108 preconstruct_25 YR.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
f nmvinhl 100A-onln D.-M. 1 Q'k"'_K
Piedmont Lithium Carolinas, Inc.
Gaston County, North Carolina
Storm water Management Plan
North Pit (Pre-Construction Phase)
Storm Event. 25 -Year/ 24-Hour
MM&A Project No. PUTI09
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename: DA109 thru DA118 preconstruct_25 YR.sc4 Prinked 03-24-2022

SEDCAD 4 for Windows
tow-onin P—ais i c,,,—K
Genera/Information
Storm Information:
Storm Type: MRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename:DA109 thru DA118 preconstruct_25 YR.sc4 Printed 03-24-2022

SEDCAD 4 for Windows
r..nor nhl IGOA-')Ain O-1. I CrK—h
3
Structure Networking:
Stru (flows Stru Musk_K
Type Stru
into) # (hrs) Musk.X Description
Null #1 =_> #11 0.000 0.000 DA-109(NP PIT POND)
Null #2 =_> #11 0.000 0.000 DA-110(SK62)
Null #3 =_> #11 0.000 0+000 DA-111 (SK63)
Null #4 =_> #3 0.000 0.000 DA-112
Null #5 =_> #3 0.000 0.000 DA-113
Null #6 =_> #11 0.000 0.000 DA-114(SK64)
Null #7 =_> #11 0.000 0.000 DA-115
Null #8 -=> #11 0.000 0.000 DA-116(SK65)
Null #9 => #8 0.000 0.000 DA-117
Null #11 =_> End 0.000 0.000 DISCHARGE OFF SITE
#9
Null
Null
#7
Null
#6
Null
41
#5
Null
#9
Null
#3
Null
4 #1
Null
If #1
Null
#11
Null
Filename:DA109 thru DA118 preconstruct_25 YR,sc4 Printed 03-24-2022

SEDCAD 4 for Windows
r,r-,hf 5uuw_,;nin P-i. I Gh-.h
4
Structure Summary.
Immediate Total peak Total
Contr,buting Contributng Discharge Runoff
Area Area Volume
(ac) (ac) (Cfs) (ac-ft)
#9 2.250 2.250 9.75 0.87
#8 6.880 9.130 39.55 3.53
#7 6.410 6.410 27.77 2.48
#6 8.680 8.680 37.60 3.35
#5 1.250 1.250 5.42 0.48
#4 0.810 0.810 3.51 0.31
#3 0.730 2.790 12.09 1.08
#2 9.470 9.470 41.03 3.66
#1 5.670 5.670 24.56 2.19
#11 0.000 42.150 182.60 16.28
Filename:DA109 thru DA118 preconstruct_25 YR.sc4 Printed 03-24-2022

SEDCAD 4 for Windows
(`nn.,rinh loop-'1MA Pe 1e F C�h.roh
Structure Detail:
Structure #9(Null)
DA-117
Structure #8(Null)
DA-116(SK65)
Structure_4'7
DA-115
Structure #6 (Nall)
DA-114(5K64)
.Structure #5(Null)
DA-113
Structure.#4(Null
DA-112
.structure #.3 LNull
DA-111 (SK63)
Structure #2(Null)
DA-110(SK62)
Structure #1 (Null)
DA-109(NP PIT POND)
Structure #11 fNull)
DISCHARGE OFF SITE
Filename-DA109 lhru DA118 preconstruct_25 YR.sc4 Printed 03-24-2022

SEDCAD 4 for Windows
6
Subwatershed Hydrology Detail:
Time of Peak Runoff i
Stru SWS SWS Area Conc Musk K Musk X Curve UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#9 1 2.250 0,035 0.000 0.000 86.000 M 9.75 0.869
2.250 9.75 0.869~
#8 1 6.880 0.075 0.000 0.000 86.000 M 29.81 2.657
9.130 39.55 3.526
#7 1 6.410 0.098 0.000 0.000 86.000 M 27.77 2.475
6.410 27.77 2.475
#6 1 8.680 0.095 0.000 0,000 86.000 M 37.60 3.352
E 8.680 37.60 3.352
#5 1 1.250 0.019 0.000 0.000 86.000 M 5.42 0.482
E 1.250 5.42 0.482
#4 1 0.810 0.027 0.000 0.000 86.000 M 3,51 0,312
E 0.810 3.51 0.312
#3 1 0.730 0.016 0.000 0.000 86.000 M 3.16 0.281
F, 2.790 12.09 1.076
#2 1 9,470 0.062 0.000 0.000 86.000 M 41.03 3.657
E 9.470 41.03 3.657
#1 1 5,670 0.082 0.000 0.000 86.000 M 24.56 2.190
5.670 24.56 2.190
#11 42.150 182.60 16.276
Subwatershed Time of Concentration Details:
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#1 1 7. Paved area and small upland 7.80 16.14 207.00 5.620 0.010
gullies
8. Large gullies,diversions,and low 5.20 40.87 786.00 6.840 0.031
flowing streams
8. Large gullies,diversions,and low 0,10 0.14 144.00 0.940 0.042
flowing streams
#1 1 Time of Concentration: 0.082
M2 t 7. Paved area and small upland 8.70 75.86 872.00 5.930 0.040
gullies
Filename: DA109 thru DA118 preconstruct 25 YR.sc4 Printed 03-24-2022

SEDCAD 4 for Windows
f'n.,i,.1..hr loon_9n�n o�.,,vi� 1 Ghu,oh
7
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%} (ft) (ft) (fps) Time (hrs)
B. Large gullies,diversions, and low 0.50 0.17 35.00 2.120 0.004
flowing streams
B. Large gullies,diversions,and low 0.10 0.06 61.00 0.940 0.018
flowing streams
#2 1 Time of Concentration: 0.062
B. Large gullies,diversions,and low
#3 1 flowing streams 50.00 22.00 44.00 21.210 0,000
8. Large gullies,diversions,and low 1.89 4.55 241.00 4.120 0.016
flowing streams
#3 1 Time of Concentration: 0.016
#4 1 5. Nearly bare and untilled, and 50.00 14.50 29.00 7.070 0.001
alluvial valley fans
B. Large gullies,diversions,and low 6.80 49.84 733.00 7.820 0.026
flowing streams
#4 1 Time of Concentration: 0.027
#5 1 5. Nearly bare and untilled,and 50.00 9.50 19.00 7.070 0.000
alluvial valley fans
8. Large gullies,diversions,and low 9,33 61.29 657.00 9.160 0.019
flowing streams
#5 1 Time of Concentration: 0.019
#6 1 7. Paved area and small upland 7,63 69.35 909.00 5.560 0.045
gullies
8. Large gullies,diversions,and low 0.50 0.89 179.00 2.120 0.023
flowing streams
B. Large gullies,diversions,and low 0.10 0.09 94.00 0.940 0,027
flowing streams
#6 1 Time of Concentration: 0.095
#7 1 7. Paved area and small upland 3.20 19.87 621.00 3.600 0,047
gullies
8. Large gullies,diversions,and low 0.50 1.97 396.00 2.120 0.051
flowing streams
#7 1 Time of Concentration: 0.098
#8 1 7• Paved area and small upland 4.73 33.72 712.89 4.370 0.045
gullies
5. Nearly bare and untilled,and 50.00 22.00 44.00 7.070 0.001
alluvial valley fans
B. Large gullies,diversions,and low 0.10 0.10 100.00 0.940 0.029
flowing streams
#8 1 Time of Concentration: 0.075
#9 1 7. Paved area and small upland 5.20 4.93 95.00 4.590 0.005
gullies
B. Large gullies,diversions,and low 5.42 38.15 704.00 6.980 0.028
flowing streams
8. Large gullies,diversions,and low 3.27 1.70 52.00 5.420 0.002
flowing streams
#9 1 Time of Concentration: 0.035
Filename:DA109 thru DA118 preconstruct_25 YR.sc4 Printed 03-24-2022

SEDCAD 4 for Windows
1
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Storm water Management Plan
West Pit (Pre-Construction Phase)
Storm Event. 25 -Year/24-Hour
MM&A Project No, PUT109
March 2022
Filename: DA35 thru DA57 preconstruct_25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: DA35 thru DA57 preconstruct 25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #1 =_> #3 0.000 0.000 DA-35
Null #2 =_> #14 0.000 0.000 DA-36
Null #3 =_> #25 0.000 0.000 DA-37(SK70)
Null #4 =_> #3 0.000 0.000 DA-38
Null #5 =_> #11 0.000 0.000 DA-39
Null #6 =_> #8 0.000 0.000 DA-40
Null #7 =_> #8 0.000 0.000 DA-41
Null #8 =_> #25 0.000 0.000 DA-42(SK32)
Null #9 =_> #11 0.000 0.000 DA-43
Null #10 =_> #11 0.000 0.000 DA-44
Null #11 =_> #25 0.000 0.000 DA-45(SB-18)
Null #12 =_> #11 0.000 0.000 DA-46
Null #13 =_> #14 0.000 0.000 DA-47
Null #14 =_> #11 0.000 0.000 DA-48(C-25)
Null #16 =_> #25 0.000 0.000 DA-49(SK36)
Null #17 =_> #16 0.000 0.000 DA-50
Null #18 =_> #25 0.000 0.000 DA-51 (SK37)
Null #19 =_> #25 0.000 0.000 DA-52(WP PIT POND)
Null #20 =_> #25 0.000 0.000 DA-53(SK38)
Null #21 =_> #25 0.000 0.000 DA-54(SK39)
Null #22 =_> #25 0.000 0.000 DA-55(SK40)
Null #23 =_> #25 0.000 0.000 DA-56(WP PIT POND)
Null #24 =_> #25 0.000 0.000 DA-57(SK33)
Null #25 =_> End 0.000 0.000 DISCHARGE OFF SITE
Null #26 =_> #11 0.000 0.000 DA-44a
#24
Null
#23
Null
#22
Null
#21
Null
#20
Null
#19
Null
#18
Null
Filename: DA35 thru DA57 preconstruct 25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r—...inhr 9aaR A 9 P-ic I ,,h...oh
4
#17
Null
#16
Null
#26
Null
#13
Null
#2
Null
#14
Null
#12
Null
#10
Null
#9
Null
#5
Null
#11
Null
#7
Null
#6
Null
#8
Null
#4
Null
#1
Null
#3
Null
#25
Null
Filename: DA35 thru DA57 preconstruct_25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r-...inhr 9QQR A 9 P-ic I ,,h...oh
5
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#24 7.110 7.110 30.80 2.75
#23 37.770 37.770 115.76 11.69
#22 1.570 1.570 6.80 0.61
#21 2.300 2.300 9.96 0.89
#20 1.910 1.910 8.27 0.74
#19 49.120 49.120 144.19 15.26
#18 8.570 8.570 37.13 3.31
#17 1.160 1.160 5.03 0.45
#16 2.500 3.660 15.86 1.41
#26 1.950 1.950 5.59 0.43
#13 3.600 3.600 15.60 1.39
#2 2.600 2.600 11.26 1.00
#14 10.170 16.370 56.00 4.61
#12 1.280 1.280 5.55 0.49
#10 5.020 5.020 11.80 1.12
#9 6.530 6.530 20.72 2.05
#5 1.810 1.810 7.84 0.70
#11 14.150 47.110 167.48 14.86
#7 1.800 1.800 7.80 0.69
#6 6.640 6.640 21.07 2.09
#8 0.570 9.010 30.67 3.00
#4 0.180 0.180 0.78 0.07
#1 1.840 1.840 7.97 0.71
#3 0.180 2.200 9.53 0.85
#25 0.000 170.330 566.29 55.35
Filename: DA35 thru DA57 preconstruct_25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
6
Structure Detail;
Structure #24(Null)
DA-57(51(33)
Structure #23(Null)
DA-56(WP PIT POND)
Structure #22 (Null)
DA-55(51(40)
Structure #21 (Null)
DA-54 (51(39)
Structure #20(Null)
DA-53 (51(38)
Structure #19(Null)
DA-52 (WP PIT POND)
Structure #18(Null)
DA-51 (5K37)
Structure #17(Null)
DA-50
Structure #16(Null)
DA-49 (51(36)
Structure #26(Null)
DA-44a
Structure #13(Null)
DA-47
Structure #2 (Null)
DA-36
Structure #14(Null)
DA-48(C-25)
Structure #12 (Null)
Filename: DA35 thru DA57 preconstruct_25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r—...inhr 9aaR-9n9n P-ic I ,,h...oh
7
DA-46
Structure #10
DA-44
Structure #9
DA-43
Structure #5
DA-39
Structure #11
DA-45(5B-18)
Structure #7
DA-41
Structure #6
DA-40
Structure #8
DA-42(5K32)
Structure #4
DA-38
Structure #1
DA-35
Structure #3(Null)
DA-37(5K70)
Structure #25
D15CHARGE OFF 51TE
Filename: DA35 thru DA57 preconstruct_25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
8
Sub watershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#24 1 7.110 0.084 0.000 0.000 86.000 M 30.80 2.746
7.110 30.80 2.746
#23 1 37.770 0.197 0.000 0.000 86.000 M 115.76 11.686
37.770 115.76 11.686
#22 1 1.570 0.024 0.000 0.000 86.000 M 6.80 0.606
E 1.570 6.80 0.606
#21 1 2.300 0.020 0.000 0.000 86.000 M 9.96 0.888
E 2.300 9.96 0.888
#20 1 1.910 0.060 0.000 0.000 86.000 M 8.27 0.737
E 1.910 8.27 0.737
#19 1 49.120 0.244 0.000 0.000 86.000 M 144.19 15.256
E 49.120 144.19 15.256
#18 1 8.570 0.056 0.000 0.000 86.000 M 37.13 3.310
E 8.570 37.13 3.310
#17 1 1.160 0.050 0.000 0.000 86.000 M 5.03 0.448
E 1.160 5.03 0.448
#16 1 2.500 0.066 0.000 0.000 86.000 M 10.83 0.965
E 3.660 15.86 1.413
#26 1 1.950 0.097 0.000 0.000 66.000 M 5.59 0.425
E 1.950 5.59 0.425
#13 1 3.600 0.054 0.000 0.000 86.000 M 15.60 1.390
E 3.600 15.60 1.390
#2 1 2.600 0.055 0.000 0.000 86.000 M 11.26 1.004
E 2.600 11.26 1.004
#14 1 10.170 0.059 0.000 0.000 66.000 M 29.14 2.218
E 16.370 56.00 4.612
#12 1 1.280 0.038 0.000 0.000 86.000 M 5.55 0.494
E 1.280 5.55 0.494
#10 1 5.020 0.155 0.000 0.000 73.000 M 11.80 1.118
E 5.020 11.80 1.118
#9 1 6.530 0.140 0.000 0.000 86.000 M 20.72 2.051
Filename: DA35 thru DA57 preconstruct 25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r-...inhr loop-9n9n P-ic I ,,h...oh
9
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
E 6.530 20.72 2.051
#5 1 1.810 0.029 0.000 0.000 86.000 M 7.84 0.699
1 1.810 7.84 0.699
#11 1 14.150 0.080 0.000 0.000 86.000 M 61.30 5.465
E 47.110 167.48 14.863
#7 1 1.800 0.091 0.000 0.000 86.000 M 7.80 0.695
Y- 1.800 7.80 0.695
#6 1 6.640 0.140 0.000 0.000 86.000 M 21.07 2.085
E 6.640 21.07 2.085
#8 1 0.570 0.023 0.000 0.000 86.000 M 2.47 0.220
E 9.010 30.67 3.000
#4 1 0.180 0.008 0.000 0.000 86.000 M 0.78 0.068
E 0.180 0.78 0.068
#1 1 1.840 0.054 0.000 0.000 86.000 M 7.97 0.710
Y- 1.840 7.97 0.710
#3 1 0.180 0.020 0.000 0.000 86.000 M 0.78 0.068
E 2.200 9.53 0.847
#25 170.330 566.29 55.352
Subwatershed Time of Concentration Details;
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#1 1 5. Nearly bare and untilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions,and low 3.31 34.45 1,041.00 5.450 0.053
flowing streams
#1 1 Time of Concentration: 0.054
#2 1 5. Nearly bare and untilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions,and low 4.60 58.37 1,269.00 6.430 0.054
flowing streams
#2 1 Time of Concentration: 0.055
#3 1 7. Paved area and small upland 6.10 4.19 68.68 4.970 0.003
gullies
8. Large gullies, diversions,and low 0.10 0.06 59.99 0.940 0.017
flowing streams
#3 1 Time of Concentration: 0.020
#4 1 5. Nearly bare and untilled,and 50.00 16.00 32.00 7.070 0.001
alluvial valley fans
Filename: DA35 thru DA57 preconstruct_25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r ,ri nr 9aaR_9nin P-i. i s n,-i,
10
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
8. Large gullies,diversions,and low 4.50 7.47 166.00 6.360 0.007
flowing streams
#4 1 Time of Concentration: 0.008
#5 1 5. Nearly bare and untilled,and 32.00 13.75 43.00 5.650 0.002
alluvial valley fans
8. Large gullies,diversions,and low 5.80 41.76 720.00 7.220 0.027
flowing streams
#5 1 Time of Concentration: 0.029
#6 1 7. Paved area and small upland 5.73 46.47 811.00 4.810 0.046
gullies
8. Large gullies,diversions,and low 0.50 3.61 723.00 2.120 0.094
flowing streams
#6 1 Time of Concentration: 0.140
#7 1 7. Paved area and small upland 5.20 17.57 338.00 4.590 0.020
gullies
8. Large gullies,diversions,and low 2.00 21.72 1,086.00 4.240 0.071
flowing streams
8. Large gullies,diversions,and low 50.00 21.50 43.00 21.210 0.000
flowing streams
#7 1 Time of Concentration: 0.091
#8 1 8. Large gullies,diversions,and low 50.00 21.50 43.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.08 79.99 0.940 0.023
flowing streams
#8 1 Time of Concentration: 0.023
#9 1 7. Paved area and small upland 4.48 11.35 253.57 4.260 0.016
gullies
8. Large gullies,diversions,and low 0.50 1.22 245.50 2.120 0.032
flowing streams
8. Large gullies,diversions,and low 1.40 16.59 1,185.00 3.540 0.092
flowing streams
#9 1 Time of Concentration: 0.140
#10 1 7. Paved area and small upland 5.30 32.38 611.00 4.630 0.036
gullies
5. Nearly bare and untilled,and 50.00 26.50 53.00 7.070 0.002
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.39 398.00 0.940 0.117
flowing streams
#10 1 Time of Concentration: 0.155
#11 1 7. Paved area and small upland 6.90 58.01 840.72 5.280 0.044
gullies
8. Large gullies,diversions,and low 5.23 47.63 910.70 6.860 0.036
flowing streams
#11 1 Time of Concentration: 0.080
#12 1 5. Nearly bare and untilled,and 50.00 16.00 32.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions,and low 6.10 60.20 987.00 7.400 0.037
flowing streams
#12 1 Time of Concentration: 0.038
#13 1 5. Nearly bare and untilled,and 0.17 0.04 28.00 0.410 0.018
alluvial valley fans
Filename: DA35 thru DA57 preconstruct 25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r-...inhr 9QQR-9n9n P-ic I ,,h...oh
11
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
5. Nearly bare and untilled,and 50.00 15.00 30.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions,and low 5.80 53.65 925.00 7.220 0.035
flowing streams
#13 1 Time of Concentration: 0.054
#14 1 7. Paved area and small upland 6.60 51.34 778.00 5.170 0.041
gullies
8. Large gullies, diversions,and low 4.50 3.82 85.00 6.360 0.003
flowing streams
8. Large gullies, diversions,and low 2.70 7.18 266.00 4.920 0.015
flowing streams
#14 1 Time of Concentration: 0.059
#16 1 5. Nearly bare and untilled,and 50.00 16.00 32.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions,and low 4.30 45.49 1,058.00 6.220 0.047
flowing streams
8. Large gullies, diversions,and low 7.20 2.88 40.00 8.040 0.001
flowing streams
8. Large gullies, diversions,and low 50.00 12.50 25.00 21.210 0.000
flowing streams
8. Large gullies, diversions,and low 0.10 0.05 58.00 0.940 0.017
flowing streams
#16 1 Time of Concentration: 0.066
#17 1 5. Nearly bare and untilled,and 50.00 16.00 32.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions,and low 4.20 45.69 1,088.00 6.140 0.049
flowing streams
#17 1 Time of Concentration: 0.050
#18 1 7. Paved area and small upland 6.50 47.12 725.00 5.130 0.039
gullies
8. Large gullies, diversions,and low 2.60 7.82 301.00 4.830 0.017
flowing streams
#18 1 Time of Concentration: 0.056
#19 1 7. Paved area and small upland 3.80 72.88 1,918.00 3.920 0.135
gullies
8. Large gullies, diversions,and low 1.90 20.72 1,091.00 4.130 0.073
flowing streams
8. Large gullies, diversions,and low 50.00 12.50 25.00 21.210 0.000
flowing streams
8. Large gullies, diversions,and low 0.10 0.12 123.00 0.940 0.036
flowing streams
#19 1 Time of Concentration: 0.244
#20 1 7. Paved area and small upland 22.00 11.00 50.00 9.440 0.001
gullies
8. Large gullies, diversions,and low 2.24 18.32 818.00 4.480 0.050
flowing streams
8. Large gullies, diversions,and low 0.10 0.03 32.00 0.940 0.009
flowing streams
#20 1 Time of Concentration: 0.060
#21 1 8. Large gullies, diversions,and low 9.20 40.66 442.00 9.090 0.013
flowing streams
Filename: DA35 thru DA57 preconstruct_25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
r ,ri nr 9aaR_9nin P-i. i s n,-i,
12
Stru SWS Slope(%) Vert. Dist. Horiz. Dist. Velocity Time(hrs)
# # Land Flow Condition Sl (ft) (ft) (fps)
8. Large gullies,diversions,and low 50.00 6.00 12.00 21.210 0.000
flowing streams
8. Large gullies,diversions,and low 0.10 0.02 25.00 0.940 0.007
flowing streams
#21 1 Time of Concentration: 0.020
#22 1 7. Paved area and small upland 7.96 29.77 374.00 5.670 0.018
gullies
8. Large gullies, diversions,and low 0.50 0.25 50.00 2.120 0.006
flowing streams
#22 1 Time of Concentration: 0.024
#23 1 7. Paved area and small upland 5.91 87.58 1,482.00 4.890 0.084
gullies
8. Large gullies,diversions,and low 3.00 42.06 1,402.00 5.190 0.075
flowing streams
8. Large gullies,diversions,and low 0.10 0.12 129.00 0.940 0.038
flowing streams
#23 1 Time of Concentration: 0.197
#24 1 7. Paved area and small upland 7.90 30.41 385.00 5.650 0.018
gullies
8. Large gullies, diversions,and low 4.70 46.95 999.00 6.500 0.042
flowing streams
8. Large gullies,diversions,and low 0.10 0.08 83.00 0.940 0.024
flowing streams
#24 1 Time of Concentration: 0.084
#26 1 7. Paved area and small upland 12.80 48.25 377.00 7.200 0.014
gullies
8. Large gullies,diversions,and low 0.50 3.19 639.00 2.120 0.083
flowing streams
#26 1 Time of Concentration: 0.097
Filename: DA35 thru DA57 preconstruct 25 YR_REVISED.sc4 Printed 05-18-2022

SEDCAD 4 for Windows
Piedmont Lithium Carolinas,, Inc.
Gaston Countv, North Carolina
Storm water Management Plan
SS-18 (Pre-Construction Phase)
Storm Event. 100 -Year/ 24-Hour
MM&A Project No. PUT109
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename: SB-18 PRECONSTRUCTION 100 YR sc4 Printed 05-10-2022

SEDCAD 4 for Windows
r`n n..—h/10QJt 9n1n Pomolo I Crh%—h �y
L
General Information
Storm Information:
Storm Type: NRCS Type 11
Design Storm: 100 yr-24 hr
Rainfall Depth: 7.870 inches
Rename: SB-18 PRECONSTRUCTION 100 YR.sc4 Printed 05-10-2022

SEDCAD 4 for Windows
(--­,jnhf loco_IMIA 0-1. 1 Crhuroh
Structure Networking:
Type Stru (flows Stru Musk. K Musk.X Description
# into) # (hrs)
Null #1 =_> #8 0.000 0.000 DA-36
Null #2 =_> #5 0.000 0.000 DA.39
Null #3 =_> #5 0.000 0.000 DA-43
Null #4 =_> #5 0.000 0.000 DA-44
Null #5 =_> End 0.000 0.000 DA-45(SB-18)
Null #6 ==> #5 0.000 0.000 DA-46
Null #7 =_> #8 0.000 0.000 DA-47
Null #8 =_> #5 0.000 0.000 DA-48(C 25)
Null #9 =_> #5 j 0.000 0.0070DA-44a
#9
Null
#7
Null
#1
Null
If #8
Null
#6
Null
#4
Null
#.3
Null
#2
Null
#5
Null
Filename: SB-18 PRECONSTRUCTION 100 YR.sc4 Printed 05-10-2022

SEDCAD 4 for Windows
P'nYM.nnhl 1ooR 9n1n pamala I Crhurah
4
Structure Summary:
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) Ws) (ac-ft)
#9 1.950 1.950 8.06 0.63
#7 3.600 3.600 20.28 1.86
#1 2.600 2.600 14.65 1.34
#8 10.170 16.370 76.97 6.51
#6 1.280 1.280 7.21 0.66
#4 5.020 5.020 16.71 1.60
#3 6.530 6.530 27.26 2.74
#2 1.810 1.810 10.20 0.94
#5 14.150 47.110 224.60 20.39
Filename: SB-18 PRECONSTRUCTION 100 YR.sc4 Printed 05-10-2022

SEDCAD 4 for Windows
F`nni.rinhf 100A.7l71 f1 Demn� 1 Snh.ush
Structure Detail:
Structure #9 �Null�
DA-44a
Structure #7(Null)
DA-47
Structure #1 (Null)
DA-36
Structure #8(Null)
DA-48 (G25)
Structure #6(Null)
DA-46
Structure #4 (Null)
DA-44
Structure #3 (Null)
DA-43
Structure #2 (Null)
DA.39
Structure #5 tNull�
DA-45(SB-18)
Filename:SB-1 8 PRECONSTRUCTION 100 YR.sc4 Printed 05-10-2022

SEDCAD 4 for Windows
rn..•ri m ioaa_9nin Conn o I Crh...oh
Suhwatershed Hydrology Detail:
Time of Peak Runoff
Stru 5W5 SW5 Area Musk K Curve Discharge Volume
# # Musk X UHS g
(ac) (hrs)Conc (hrs) M Number (cfs) (ac-ft)
#9 1 1.950 0.097 0.000 0.000 66.000 M 8.06 0.633
1.950 6.06 0.633
#7 1 3.600 0.054 0.000 0.000 86.000 M 20.28 1.860
F, 3.600 20.28 1.860
#1 1 2.600 0.055 0.000 0.000 86.000 M 14.65 1.343
2.600 14.65 1.343
#8 1 10.170 0.059 0.000 0.000 66.000 M 42.04 3.303
16.370 76.97 6.507
#6 1 1.280 0.038 0.000 0.000 86.000 M 7.21 0.661
1.280 7.21 0.661
ax4 5.020 0.155 0.000 0.000 73.000 M 16.71 1.596
5.020 16.71 1.596
s 3 1 6.530 0.140 0.000 0.000 86.000 M 27.26 2.744
F, 6.530 27.26 2.744
#2 1 1.810 LW29 01000 0.000 86.000 M 10.20 0.935
1.810 10.20 0.935
#5 1 14.150 04W D.000 0.040 86.000 M 79.73 7.312
E 47.110 224.60 20.388
Su►bwatershed Time of Concentration Details:
Stru SW5 Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%} (ft) (ft) (fps) Time(hrs)
#1 1 5. Nearly bare and untilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 4.60 58.37 1,269.00 6.430 0.054
flowing streams
#1 1 Time of Concentration: 0.055
#2 1 S. Nearly bare and untilled, and 32.00 13.75 43.00 5.650 0.002
alluvial valley fans
8. Large gullies,diversions,and low 5.80 41.76 720.00 7.220 0.027
flowing streams
#2 1 Time of Concentration: 0.029
Filename SB-18 PRECONSTRUCTION 100 YR.sc4 Printed 05-10-2022

SEDCAD 4 for Windows
d',- Kt 400A_AMA D-I. 1 GMuah
7
Stru SWS d Flo Condition SlopeVert. Dist. Horiz. Dist. Velocity
# # Land ii (%) (ft) (ft) (fps) Time(hrs)
#3 1 7. Paved area and small upland 4.48 11.36 253.57 4,260 0.016
gullies
8. Large gullies, diversions,and low 0.50 1.22 245.50 2.120 0.032
flowing streams
B. Large gullies,diversions, and low 1.40 16.59 1,185.00 3.540 0.092
flowing streams
#3 1 Time of Concentration: 0.140
#4 1 7. Paved area and small upland 5.30 32.38 611.00 4.630 0.036
gullies
5. Nearly bare and untitled,and 50.00 26.50 53.00 7.070 0.002
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.39 398.00 0.940 0.117
flowing streams
#4 1 Time of Concentration: 0.155
#5 1 7• Paved area and small upland 6.90 58.02 840.86 5.280 0.044
gullies
8. Large gullies,diversions,and low 5.23 47.64 910.89 6.860 0.036
flowing streams
#5 1 Time of Concentration: 0.080
#6 1 5. Nearly bare and untilled,and 50.00 16.00 32.00 7.070 0,001
alluvial valley fans
8. Large gullies,diversions,and low 6.10 60.20 987.00 7.400 0.037
flowing streams
#6 1 Time of Concentration: 0.038
#7 1 5. Nearly bare and untilled,and 0.17 0.04 28.00 0.410 0.018
alluvial valley Fans
5. Nearly bare and untilled,and 50.00 15.00 30.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 5.80 53.65 925,00 7,220 0.035
flowing streams
#7 1 Time of Concentration: 0.054
#8 1 7. Paved area and small upland 6.60 51.34 778.00 5,170 0.041
gullies
8. Large gullies,diversions,and low 4.50 3.82 85.00 6.360 0.003
flowing streams
8. Large gullies,diversions, and low 2.70 7.18 266.00 4.920 0.015
flowing streams
#8 1 Time of Concentration: 0.059
#9 1 7. Paved area and small upland 12.80 48,25 377.00 7.200 0.014
gullies
8. Large gullies,diversions,and low 0.50 3.19 639.00 2.120 0.083
flawing streams
#9 1 Time of Concentration: 0.097
Filename: SS-18 PRECONSTRUCTION 100 YR.sc4 Printed 05-10-2022

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SEDCAD 4 for Windows
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Storm water Management Plan
SB-18 (During Mining Phase)
Storm Event: 100 -Year/ 24-Hour
MM&A Project No. PUTI09
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename:SB-18 DURING MINING 100 YR-sc4 Printed 05-06-2022

SEDCAD 4 for Windows
f^—Ar h/144A_'Min P—djl 1 4`rhwsh
Genera/Information
Storm Information:
Storm Type: NRCS Type II
Design Storm: 100 yr-24 hr
Rainfall Depth: 7.870 inches
Filename: 5B-1 8 DURING MINING-1 00 YR.sc4 Printed 05-06-2022

SEDCAD 4 for Windows
Structure Networking;
Type Stru (Flows Stru Musk. K Musk.X Description
# into) # (hrs)
Null #1 =_> #8 0.000 0.000 DA-56
Null #2 #5 0.000 0.000 DA-96
Null #3 =_> #9 0.000 0.000 DA-64
Null #4 ==> #9 0.000 0.000 DA-101
Null #5 --> #9 0.000 0.000 DA-99(C-7)
Null #6 =_> #5 0.000 0.000 DA-98
Null #7 --> #8 0.000 0.000 DA-97
Null #8 --> #5 0.000 0.000 DA-57(C-25)
Null #9 =_> End 0.000 0.000 DA-100(SB-18)
Null #10 =_> #5 0.000 0.000 DA-63
Null #11 =_> #4 0.000 0.000 DA-67
Null #12 =_> #9 0.000 0.000 DA-65
Null #13 =_> #9 0.000 0.000 DA-101a
4i #13
Null
#12
Null
0 #10
Null
4 #7
Null
#1
Null
#8
Null
#6
Null
#2
Null
#S
Null
#11
Null
#4
Null
#3
Null
Filename:SB-18 DURING MINING 100 YR.sc4 Printed 05-06-2022

SEDCAD 4 for Windows
r`,--hf 1QGR )nln Pamela I -z,K-.h
#9
Null
Filename SS-18 DURING MINING-1 00 YR,sc4 Printed 05-06-2022

SEDCAD 4 for Windows
(nnurinhf 1009 )nin o—arF I Q,hi—h
G
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cf5) (ac-ft)
#13 1.950 1.950 8.06 0.63
#12 0.720 0.720 4.06 0.37
#10 2.600 2.600 14.65 1.34
#7 3.600 3.600 17.09 1.41
#1 2.600 2.600 12.35 1.02
#8 10.170 16.370 71.48 5.73
#6 1.280 1.280 7.21 0.66
#2 1.810 1.810 8.88 0.74
#5 14.150 36.210 163.30 13.33
#11 3.230 3.230 18.20 1.67
#4 3.120 6.350 33.99 3.01
#3 6.530 6.530 24.94 2.71
#9 4.270 56.030 254.16 21.77
Filename: SB-18 DURING MINING-1 00 YR.sc4 Printed 05-06-2022

SEDCAD 4 for Windows
r—rinhl loose 9n�n pamala I Crhurah
6
Structure Detail;
Structure #13(Null)
DA-101a
Structure #1 Z (Null)
DA-65
Structure.#10 (Null)
DA-63
Structure #7(Null)
DA-97
Structure #1 (Null)
DA 56
Structure #8(Null)
DA-57(C-25)
Structure #6 (Null)
DA-98
Structure #Z (Null)
DA-96
Structure#5(Null)
DA-99 (C-7)
Structure #11 (Null)
DA-67
Structure #4 (Null)
DA-101
Structure #3(Null)
DA-64
Structure #9 (Null)
Filename: SB-18 DURING MINING 100 YR.sc4 Printed 05-06-2022

SEDCAD 4 for Windows
f nrainnhf imt )mn P-i. 1 C�h.ah T
DA-1 00 (sa-18)
Filename: 5B-18 DURING MINING 100 YR.sc4 Printed 05-06-2022

SEDCAD 4 for Windows
f-..-ht 1OOA inin P-i. I Qrh-.h p
i.}
Subwatershed Hydrology Detail:
Time of Peak Runoff
Stru SWS SWS Area Conc Musk K Musk X Curve UFiS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#13 1 1.950 0.097 0.000 0.000 66.000 M 8.06 0.633
E 1.950 8.06 0.633
#12 1 0.720 0.045 0.000 0.000 86.000 M 4.06 0.372
E 0.720 4.06 0.372
#10 1 2.600 0.086 0.000 0.000 86.000 M 14.65 1.343
E 2.600 14.65 1.343
#T 1 3.600 0.054 0.000 0.000 73.000 M 17.09 1.407
Y, 3.600 17.09 1.407
#1 1 2.600 0.055 0.000 0.000 73.000 M 12.35 1.016
E 2.600 12.35 1.016
1 10.170 0.059 0.000 0.000 66.000 M 42.04 3.303
16.370 71.48 5.726
#6 1 1.280 0.038 0.000 0.000 86.000 M 7.21 0.661
1.280 7.21 0.661
#2 1 1.810 0.029 0.000 0.000 75.000 M 8.88 0.742
1.810 8.88 0.742
#5 1 14.150 0.077 0.000 0.000 68.000 M 61.08 4.861
36.210 163.30 13.334
sit 1 3.230 0.080 0.000 0.000 86.000 M 18.20 1.669
3.230 18.20 1.669
#4 1 3.120 0.077 0.000 0.000 77.000 M 15.79 1.339
6.350 33.99 3.008
#3 1 6.530 0.254 0.000 0.000 86.000 M 24.94 2.709
6.530 24.94 2.709
#9 1 4.270 0.025 0.000 0.000 74.000 M 20.62 1.710
56.030 254.16 21.765
Subwatershed Time of Concentration Details:
Filename SB-18 DURING MINING 100 YR.sc4 Printed 05-06-2022

SEDCAD 4 for Windows
f nnurin6�7oole.9nin P-1a I C,h-,k
9
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time (hrs)
#1 1 5. Nearly bare and untilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 4.60 58.37 1,269.00 6.430 0.054
flowing streams
#1 1 Time of Concentration: 0.055
#2 1 5. Nearly bare and untilled, and 32.00 13.75 43.00 5.650 0.002
alluvial valley fans
B. Large gullies,diversions,and low 5.80 41.76 720.00 7.220 0.027
flowing streams
#2 1 Time of Concentration: 0.029
#3 1 5. Nearly bare and untilled,and 2.85 13.99 491.00 1.680 0.081
alluvial valley fans
8. Large gullies, diversions,and low 0.50 6.62 1,326.00 2.120 0.173
flowing streams
#3 1 Time of Concentration: 0.254
#4 1 7. Paved area and small upland 10.64 30.85 290.00 6.560 0.012
gullies
5. Nearly bare and untilled,and 50.00 18.00 36.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 0.10 0.21 219.00 0.940 0.064
flowing streams
#4 1 Time of Concentration: 0.077
#5 1 7. Paved area and small upland 6.30 59.85 950.00 5.050 0.052
gullies
8. Large gullies,diversions,and low 1.70 2.44 144.00 3.910 0.010
flowing streams
8. Large gullies, diversions,and low 3.95 13.11 332.00 5.960 0.015
flowing streams
#5 1 Time of Concentration: 0.077
#6 1 5. Nearly bare and untilled,and 50.00 16.00 32.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 6.10 60.20 987.00 7.400 0.037
flowing streams
#6 1 Time of Concentration: 0.038
#7 1 S. Nearly bare and untilled,and 0.17 0.04 28.00 0.410 0.018
alluvial valley fans
5. Nearly bare and untilled,and 50.00 15.00 30.00 7.070 0.001
alluvial valley fans
8. Large gullies,diversions,and low 5.80 53.65 925.00 7.220 0.035
flowing streams
#7 1 Time of Concentration: 0.054
#8 1 7. Paved area and small upland 6.60 51.34 778.00 5.170 0.041
gullies
8. Large gullies,diversions,and low 4.50 3.82 85.00 6.360 0.003
flowing streams
B. Large gullies,diversions,and low 2.70 7.18 266.00 4.920 0.015
flowing streams
#8 1 Time of Concentration: 0.059
Filename: SB-18 DURING MINING 100 YR.sc4 Printed 05-06-2022

SEDCAD 4 for Windows
f nn..rinhf 1QQR_WMI P-1. I Ghurah
10
Stru SW5 Vert. Dist. Noriz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#9 1 5. Nearly bare and untilled,and 50.00 25.00 50.00 7.070 0.001
alluvial valley fans
7. Paved area and small upland 12.00 32.16 268.00 6.970 0.010
gullies
8. Large gullies,diversions, and low 6.64 27.35 412.00 7.730 0.014
flowing streams
#9 1 Time of Concentration: 0.025
#10 1 S. Nearly bare and untilled,and 0.50 0.19 38.00 0.700 0.015
alluvial valley fans
8. Large gullies,diversions,and low 2.70 33.96 1,258.00 4.920 0.071
flowing streams
#10 1 Time of Concentration: 0.086
#11 1 5• Nearly bare and untilled,and 0.50 0.19 38.00 0.700 0.015
alluvial valley fans
B. Large gullies,diversions,and low 4.70 65.61 1,396.00 6.500 0.059
flowing streams
8. Large gullies,diversions,and low 3,00 3.60 120.00 5.190 0.006
flowing streams
#11 1 Time of Concentration: 0.080
#12 1 5. Nearly bare and untitled,and 0.50 0.19 38.00 0.700 0.015
alluvial valley fans
8. Large gullies,diversions, and low 3.60 22.21 617.00 5.690 0.030
flowing streams
#12 1 Time of Concentration: 0.045
#13 1 7. Paved area and small upland 12.80 48.25 377.00 7.200 0.014
gullies
8. Large gullies,diversions,and low 0.50 3.19 639.00 2.120 0.083
flowing streams
013 1 Time of Concentration: 0.097
Filename SB-18 DURING MINING 100 YR.sc4 Printed 05-06-2022

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Drainage Calculations for Concentrate Operations,Piedmont Lithium Carolinas,Inc.
Gaston County,North Carolina
►►' ►► May2022
Haul Roads
• Haul Roads—Operational Sedcad 4 Calculations
MARSHALL MILLER&ASSOCIATES INC.

SEDCAD 4 for Windows
r'n ...inhf IQaR_9l19O Pamela I Q,h,e h
1
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Stormwater Management Plan
Road Ditches DA-51, DA-52, DA-53, SK29 and Culvert C-2
Drainage Area(s): 51, 51a, 52 and 53
Storm Event; 25 -Year/ 24-Hour
MM&A Project No, PLIT1O9
April, 2022
Filename: DA-51 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: DA-51 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #1 ==> #4 0.000 0.000 DA-51
Null #2 ==> #4 0.000 0.000 DA-52
Null #3 =_> #5 0.000 0.000 DA-53
Null #4 =_> #6 0.000 0.000 C-2
Null #5 =_> #6 0.000 0.000 Drain
Null #6 =_> End 0.000 0.000 DA 51a - SK29
#3
Null
#5
Null
#2
Null
#1
Null
#4
Null
#6
Null
Filename: DA-51 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
4
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#3 1.490 1.490 6.45 0.58
#5 0.000 1.490 6.45 0.58
#2 1.570 1.570 6.80 0.61
#1 3.730 3.730 15.49 1.34
#4 0.000 5.300 22.29 1.95
#6 1.850 8.640 36.31 3.17
Filename: DA-51 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crheh
5
Structure Detail;
Structure #3
DA-53
Structure #5
Drain
Structure #2
DA-52
Structure #1
DA-51
Structure #4
C-2
Structure #6
DA 51a - SK29
Filename: DA-51 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r'n ...inhf IGOP_9(19(1 Pamela I Q,h,e h
6
Subwatershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) (hrs) Number (cfs) (ac-ft
#3 1 1.490 0.054 0.000 0.000 86.000 M 6.45 0.575
1.490 6.45 0.575
#5 1.490 6.45 0.575
#2 1 1.570 0.063 0.000 0.000 86.000 M 6.80 0.606
1.570 6.80 0.606
#1 1 3.730 0.085 0.000 0.000 83.000 M 15.49 1.340
3.730 15.49 1.340
#4 5.300 22.29 1.946
#6 1 1.850 0.108 0.000 0.000 82.000 M 7.56 0.648
8.640 36.31 3.169
Subwatershed Time of Concentration Details;
Stru SWS Land Flow Condition Slope(%) Vert. Dist. Horiz. Dist. Velocity Time(hrs)
# # (ft) (ft) (fps)
#1 1 3. Short grass pasture 6.30 10.14 161.00 2.000 0.022
5. Nearly bare and untilled,and 50.00 22.00 44.00 7.070 0.001
alluvial valley fans
5. Nearly bare and untilled,and 0.50 0.35 70.00 0.700 0.027
alluvial valley fans
8. Large gullies,diversions,and low 7.00 52.99 757.00 7.930 0.026
flowing streams
8. Large gullies,diversions,and low 3.00 5.28 176.00 5.190 0.009
flowing streams
#1 1 Time of Concentration: 0.085
#2 1 5. Nearly bare and untilled, and 0.50 0.19 39.50 0.700 0.015
alluvial valley fans
8. Large gullies,diversions,and low 6.10 66.61 1,092.00 7.400 0.040
flowing streams
8. Large gullies, diversions, and low 3.00 4.50 150.00 5.190 0.008
flowing streams
#2 1 Time of Concentration: 0.063
#3 1 5. Nearly bare and untilled, and 0.50 0.19 39.50 0.700 0.015
alluvial valley fans
8. Large gullies,diversions,and low 6.60 71.54 1,084.00 7.700 0.039
flowing streams
8. Large gullies, diversions, and low 50.00 21.00 42.00 21.210 0.000
flowing streams
Filename: DA-51 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nrnirinh4 1QQR_9f11 f1 Pamch I Crhe�h
7
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#3 1 Time of Concentration: 0.054
#6 1 3. Short grass pasture 4.00 7.80 195.00 1.600 0.033
5. Nearly bare and untilled, and 50.00 32.50 65.00 7.070 0.002
alluvial valley fans
5. Nearly bare and untilled, and 0.50 0.45 91.00 0.700 0.036
alluvial valley fans
8. Large gullies, diversions, and low 0.10 0.12 127.00 0.940 0.037
flowing streams
#6 1 Time of Concentration: 0.108
Filename: DA-51 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
f nnvrin h4 9QQR Al19l1 Pnmoln I Crhn,nh
1
Piedmont Lithium Carolinas, Inc.
Gaston CountyE North Carolina
Storm water Management Plan
Culvert C-6 (During Mining Phase)
Storm Event; 100 -Year/ 24-Hour
MM&A Project No, PUT109
March 2022
Marshall Miller and Associates, Inc.
200 George Street
Suite 5
Beckley, West Virginia 25801
Phone: [phone]
Email: [e-mail]
Filename: CULVERT C-6 100 YR.sc4 Printed 06-03-2022

SEDCAD 4 for Windows
f nnvrin h4 9QQR Al19l1 Pnmoln I Crhn,nh
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 100 yr- 24 hr
Rainfall Depth: 7.870 inches
Filename: CULVERT C-6 100 YR.sc4 Printed 06-03-2022

SEDCAD 4 for Windows
f nnvrin h4 9QQR Al19l1 Pnmoh I Crhn,nh
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #1 =_> #2 0.000 0.000 DA-92
Null #2 =_> #4 0.000 0.000 DA-93
Null #3 =_> #2 0.000 0.000 DA-94
Null #4 =_> End 0.000 0.000 DA-95 (C-6)
#3
Null
#1
Null
#2
Null
#4
Null
Filename:CULVERT C-6 100 YR.sc4 Printed 06-03-2022

SEDCAD 4 for Windows
f nnvrin h4 9QQR Al19l1 Pnmoh I Crhn,nh
4
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#3 0.180 0.180 1.01 0.09
#1 1.840 1.840 10.37 0.95
#2 0.180 2.200 12.40 1.13
#4 2.610 4.810 27.10 2.48
Filename:CULVERT C-6 100 YR.sc4 Printed 06-03-2022

SEDCAD 4 for Windows
f—...inhr IaaR Ar19r)P—Io I Crhu—h
5
Structure Detail;
Structure #3 (Null1
DA-94
Structure #1 (Null)
DA-92
Structure #2 (Null)
DA-93
Structure #4 (Null1
DA-95(C-6)
Filename: CULVERT C-6 100 YR.sc4 Printed 06-03-2022

SEDCAD 4 for Windows
f nnvrinh4 1QQA_9119/1 P�moh I Crhninh
6
Sub watershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#3 1 0.180 0.008 0.000 0.000 86.000 M 1.01 0.092
0.180 1.01 0.092
#1 1 1.840 0.054 0.000 0.000 86.000 M 10.37 0.951
E 1.840 10.37 0.951
#2 1 0.180 0.020 0.000 0.000 86.000 M 1.01 0.092
E 2.200 12.40 1.134
#4 1 2.610 0.032 0.000 0.000 86.000 M 14.71 1.349
E 4.810 27.10 2.482
Subwatershed Time of Concentration Details;
Stru SWS Land Flow Condition Slope(%) Vert. Dist. Horiz. Dist. Velocity Time(hrs)
# # (ft) (ft) (fps)
#1 1 5. Nearly bare and untilled,and 50.00 13.00 26.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 3.31 34.45 1,041.00 5.450 0.053
flowing streams
#1 1 Time of Concentration: 0.054
#2 1 7. Paved area and small upland 6.10 4.18 68.68 4.970 0.003
gullies
8. Large gullies, diversions, and low 0.10 0.06 60.00 0.940 0.017
flowing streams
#2 1 Time of Concentration: 0.020
#3 1 5. Nearly bare and untilled,and 50.00 16.00 32.00 7.070 0.001
alluvial valley fans
8. Large gullies, diversions, and low 4.50 7.47 166.00 6.360 0.007
flowing streams
#3 1 Time of Concentration: 0.008
#4 1 5. Nearly bare and untilled,and 50.00 42.50 85.00 7.070 0.003
alluvial valley fans
7. Paved area and small upland 3.60 10.47 290.83 3.810 0.021
gullies
8. Large gullies, diversions, and low 7.60 18.61 245.00 8.270 0.008
flowing streams
#4 1 Time of Concentration: 0.032
Filename: CULVERT C-6 100 YR.sc4 Printed 06-03-2022

SEDCAD 4 for Windows
1
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Storm water Management Plan
ROAD CUL VERT C-13
Drainage Area(s); 58, 59, 62, and 75
Storm Event; 100 -Year/24-Hour
MM&A Project No, PUT109
April, 2021
Filename: DA-58 ROAD CULVERT_100 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 100 yr-24 hr
Rainfall Depth: 7.870 inches
Filename: DA-58 ROAD CULVERT_100 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk. X Description
# into) # (hrs)
Null #1 =_> End 0.000 0.000 DA-58(ROAD CULVERT C-13)
Null #2 =_> #1 0.000 0.000 DA-59
Null #3 =_> #2 0.000 0.000 DA-62
#3
Null
#2
Null
#1
Null
Filename: DA-58 ROAD CULVERT_100 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr 9QQR-9n9n P-ic I ,,h...oh
4
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#3 0.650 0.650 3.66 0.34
#2 0.840 1.490 8.40 0.77
#1 271.000 272.490 525.14 75.05
Filename: DA-58 ROAD CULVERT_100 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
5
Structure Detail;
Structure #3
DA-62
Structure #2
DA-S9
Structure #1 (Null)
DA-58(ROAD CUL VERT C-13)
Filename: DA-58 ROAD CULVERT_100 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr loop-9n9n P-ic I ,,h...oh
6
Sub watershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) (hrs) Number (cfs) (ac-ft
#3 1 0.650 0.047 0.000 0.000 86.000 M 3.66 0.336
1 0.650 3.66 0.336
#2 1 0.840 0.032 0.000 0.000 86.000 M 4.73 0.434
E 1.490 8.40 0.769
#1 1 271.000 0.607 0.000 0.000 68.000 M 523.53 74.277
272.490 525.14 75.047
Subwatershed Time of Concentration Details;
Stru SWS Land Flow Condition Slope(%) Vert. Dist. Horiz. Dist. Velocity Time(hrs)
# # (ft) (ft) (fps)
#1 1 1. Forest with heavy ground litter 3.22 9.66 300.00 0.450 0.185
7. Paved area and small upland 3.54 94.51 2,670.00 3.780 0.196
gullies
8. Large gullies, diversions,and low 1.55 47.15 3,042.00 3.730 0.226
flowing streams
#1 1 Time of Concentration: 0.607
#2 1 5. Nearly bare and untilled,and 6.60 9.24 140.00 2.560 0.015
alluvial valley fans
8. Large gullies, diversions,and low 8.20 28.78 351.00 8.590 0.011
flowing streams
8. Large gullies, diversions,and low 0.50 0.26 53.00 2.120 0.006
flowing streams
#2 1 Time of Concentration: 0.032
#3 1 5. Nearly bare and untilled,and 0.50 0.19 39.50 0.700 0.015
alluvial valley fans
8. Large gullies, diversions,and low 3.20 16.48 515.00 5.360 0.026
flowing streams
8. Large gullies, diversions,and low 5.00 8.25 165.00 6.700 0.006
flowing streams
#3 1 Time of Concentration: 0.047
Filename: DA-58 ROAD CULVERT_100 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
1
Piedmont Lithium Carolinas, Inc.
Gaston County, North Carolina
Storm water Management Plan
Worst Case Haul Road Ditch, Culvert C-14
Drainage Area(s); 60 and 61
Storm Event. 25 -Year/24-Hour
MM&A Project No, PLIT109
April, 2021
Filename:WORST CASE HAUL ROAD DITCH 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename:WORST CASE HAUL ROAD DITCH 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk.X Description
# into) # (hrs)
Null #1 =_> #4 0.000 0.000 DA-60(C-14)
Null #2 =_> #4 0.000 0.000 DA-61
Null #4 =_> End 0.000 0.000 SEDIMENT DITCH DISCHARGE
#2
Null
#1
Null
#4
Null
Filename:WORST CASE HAUL ROAD DITCH 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr 9QQR-9n9n P-ic I ,,h...oh
4
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#2 2.210 2.210 9.57 0.85
#1 1.620 1.620 7.02 0.63
#4 0.000 3.830 16.59 1.48
Filename:WORST CASE HAUL ROAD DITCH 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
5
Structure Detail;
Structure #2
DA-61
Structure #1 (Nulls
DA-60 (C-4)
Structure #4(Nulls
SEDIMENT DITCH DISCHARGE
Filename:WORST CASE HAUL ROAD DITCH 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr 9QQR-9n9n P-ic I ,,h...oh
6
Sub watershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#2 1 2.210 0.074 0.000 0.000 86.000 M 9.57 0.853
E 2.210 9.57 0.853
#1 1 1.620 0.061 0.000 0.000 86.000 M 7.02 0.625
E 1.620 7.02 0.625
#4 3.830 16.59 1.479
Subwatershed Time of Concentration Details;
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#1 1 5. Nearly bare and untilled,and 7.00 11.06 158.00 2.640 0.016
alluvial valley fans
8. Large gullies, diversions,and low 4.20 37.29 888.00 6.140 0.040
flowing streams
8. Large gullies, diversions,and low 3.00 3.30 110.00 5.190 0.005
flowing streams
#1 1 Time of Concentration: 0.061
#2 1 5. Nearly bare and untilled,and 1.00 0.39 39.50 1.000 0.010
alluvial valley fans
8. Large gullies, diversions,and low 4.42 64.39 1,457.00 6.300 0.064
flowing streams
#2 1 Time of Concentration: 0.074
Filename:WORST CASE HAUL ROAD DITCH 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
1
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Storm water Management Plan
Haul Road Ditches DA-71 and DA-72, and Culvert C-10
Drainage Area(s); 71 and 72
Storm Event; 25 -Year/24-Hour
MM&A Project No, PUT109
April, 2021
Filename: DA-71 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: DA-71 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr 9aaR-9n9n P-ic I ,,h...oh
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk.X Description
# into) # (hrs)
Null #1 =_> #2 0.000 0.000 DA-72
Null #2 =_> End 0.000 0.000 DA-71
#1
Null
#2
Null
Filename: DA-71 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr 9QQR-9n9n P-ic I ,,h...oh
4
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#1 1.600 1.600 6.93 0.62
#2 1.620 3.220 13.95 1.24
Filename: DA-71 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
5
Structure Detail;
Structure #1
DA-72
Structure #2
DA-71
Filename: DA-71 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr 9QQR-9n9n P-ic I ,,h...oh
6
Sub watershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) (hrs) Number (cfs) (ac-ft
#1 1 1.600 0.112 0.000 0.000 86.000 M 6.93 0.618
1 1.600 6.93 0.618
#2 1 1.620 0.095 0.000 0.000 86.000 M 7.02 0.625
E 3.220 13.95 1.243
Subwatershed Time of Concentration Details;
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#1 1 5. Nearly bare and untilled,and 0.50 0.19 39.50 0.700 0.015
alluvial valley fans
8. Large gullies, diversions,and low 1.00 2.74 274.00 3.000 0.025
flowing streams
8. Large gullies, diversions,and low 1.20 9.35 780.00 3.280 0.066
flowing streams
8. Large gullies, diversions,and low 3.00 3.60 120.00 5.190 0.006
flowing streams
#1 1 Time of Concentration: 0.112
#2 1 5. Nearly bare and untilled,and 0.50 0.19 39.50 0.700 0.015
alluvial valley fans
8. Large gullies, diversions,and low 5.90 20.23 343.00 7.280 0.013
flowing streams
8. Large gullies, diversions,and low 1.20 9.35 780.00 3.280 0.066
flowing streams
8. Large gullies, diversions,and low 4.70 1.17 25.00 6.500 0.001
flowing streams
#2 1 Time of Concentration: 0.095
Filename: DA-71 25 YR.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
1
Piedmont Lithium Carolinas, Inc.
Gaston County,, North Carolina
Storm water Management Plan
ROAD CULVERT C-11
Drainage Area(s); 73 and 74
Storm Event. 25 -Year/24-Hour
MM&A Project No, PLIT109
April, 2021
Filename: DA-74 ROAD CULVERT_25 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
2
Genera/Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.240 inches
Filename: DA-74 ROAD CULVERT_25 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr 9aaR-9n9n P-ic I ,,h...oh
3
Structure Networking;
Type Stru (flows Stru Musk. K Musk.X Description
# into) # (hrs)
Null #1 =_> End 0.000 0.000 DA-74
Null #2 =_> #1 0.000 0.000 DA-73
#2
Null
#1
Null
Filename: DA-74 ROAD CULVERT_25 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr 9QQR-9n9n P-ic I ,,h...oh
4
Structure Summary;
Immediate Total Peak Total
Contributing Contributing Discharge Runoff
Area Area Volume
(ac) (ac) (cfs) (ac-ft)
#2 1.820 1.820 7.88 0.70
#1 11.600 13.420 25.81 2.80
Filename: DA-74 ROAD CULVERT_25 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
5
Structure Detail;
Structure #2
DA-73
Structure #1
DA-74
Filename: DA-74 ROAD CULVERT_25 yr.sc4 Printed 05-17-2022

SEDCAD 4 for Windows
r-...inhr 9QQR-9n9n P-ic I ,,h...oh
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Sub watershed Hydrology Detail;
SWS Area Time of Musk K Curve Peak Runoff
Stru SWS Conc Musk X UHS Discharge Volume
# # (ac) (hrs) Number
(hrs) (cfs) (ac-ft)
#2 1 1.820 0.063 0.000 0.000 86.000 M 7.88 0.703
1 1.820 7.88 0.703
#1 1 11.600 0.265 0.000 0.000 67.000 M 20.12 2.099
E 13.420 25.81 2.802
Subwatershed Time of Concentration Details;
Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#1 1 3. Short grass pasture 1.00 0.91 92.00 0.800 0.031
1. Forest with heavy ground litter 1.33 2.76 208.00 0.290 0.199
7. Paved area and small upland 5.38 32.44 603.00 4.660 0.035
gullies
#1 1 Time of Concentration: 0.265
#2 1 5. Nearly bare and untilled,and 0.50 0.19 39.50 0.700 0.015
alluvial valley fans
8. Large gullies, diversions,and low 2.16 16.39 759.00 4.400 0.047
flowing streams
8. Large gullies, diversions,and low 2.50 0.77 31.00 4.740 0.001
flowing streams
#2 1 Time of Concentration: 0.063
Filename: DA-74 ROAD CULVERT_25 yr.sc4 Printed 05-17-2022

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Drainage Calculations for Concentrate Operations,Piedmont Lithium Carolinas,Inc.
Gaston County,North Carolina
►►' ►► May2022
NOAA Atlas 14 Rainfall Data; Web Soil Survey National
Cooperative Soil Survey for Drainage Calculations
MARSHALL MILLER&ASSOCIATES INC.

Precipitation Frequency Data Server Page 1 of 4
NOAA Atlas 14,Volume 2,Version 3
Location name:Crouse,North Carolina,USA* "'e
Latitude:35.4229°,Longitude:-81.299Is 7°
Elevation:819.7 ft'° �
NW -source ESRI Maps
••sourer t'SGs
POINT PRECIPITATION FREQUENCY ESTIMATES
G,M Bonnin 0 Martin,13 Lin,T Parzybok M Yekta.and C Riloy
NOAA,National Weather5ervix silver 5pnng Maryland
PF tabular I PF gra !1n ical I Maas & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90%confidence intervals(in Inches)'
Average recurrence interval ears
uretion�•��-••---•-�,r-•------�-, 10 29 50 100 200 504 1000
5-min 0.391 0.463 0.544 0.606 0.680 0.734 - 0.787 0.838 0.900 0.949
(0.360-0.426 (0.425-0 505)(0.499,0.594 (0 553-0.659 (0.617-0 741 (0.663 0 800)0 706-0.859) 0 745-0.917 0 792-0,990) (0.825 1 05
10-min 0.625 0.740 0.871 0.968 1.08 1.17 1.25 1.33 1.42 1.49
(0.574.0.680 (0680-0908) (0.799a951 (0.884.106) (0984.118) (1.06,127) f1121.37} (118.1,45) (1.25.1.57) (1.30.1.65)
15-m In 0.781 0.930 1.10 1.22 1.37 1.41 1.68 1.68 1.79 1.88
0718.0.851 0.855.1.02 1.01-1.20 1.12.1.33 125-15D 1.34-161 r142-173) t.49.1.83 159-1.97 1.63.2.07
30-min 1.07 1.29 1.67 1.77 2.03 2.23 2.42 2.61 2.85 3.04
(0.984-117) (110.1.40) (1.44-171) (182.193) (1.85.222) {2.01-2431 (217-2.54) (2.32.2.86) {2.51.3.14) (2.84.3.38J
60-min 1.34 1.61 2.01 1 2.31 L71 3.02 3.34 3.66 4.09 4.43
(1.23.1 45) (1.48.1.76) (1.84-2 19) 12 11.2.52) (2 46-2 95) (2 73-31 29) (2 99.3.64) 1 (3.25.4.00) (3.60.4.50) (3.86490)
2-hr 1.55 1.86 E16-2
Z74 3.25 !! 3.65 4.08 4.51 5.12 5.61
(1.42.1 70) 0 73-2.06) 59) (2 49.2 991 (3.29-3.991 (3fi4 447) (4.00 4.96] (4.48 5.fi6) 14.85.6.231
1.66 2.01 2.94 3.S2 4.00 4.49 6.03 6.79 6.421.52.183 184-2.21 78 2.67.3 23 3 18-3.87 3.59-4 391 3 994 94 4.2.5.55 5.01-6.42 5 48-7 15
6-hr 2.04 2.46 3A$ 3.58 4.2$ 4.$7 5.4a 6.14 7.09 7.$6
1.66.2 23) 2 26-2.69 2.82-3.36) 3.27-3 91 3 89-4.67 4.39-5.311 j (4 89.6 001 5.43-6 74) 6 15-7.90 6.74-6 69
12-hr 2.47 2.98 3.74 4.35 1 5.20 6.90 6.64 7.42
911.3-13.4
351 9.46
(2,26.269) (2 75-3.26) (3.4-4,08) (3.98473) (473-5. 3-64 } (5.94-7.21) (6 57-8.07) (8.14-10
3)
29718) 3.58 4.61 5.24 6.24 ,04 7.87 6.72 Iola24-hr {276.3 (3.34-385) (4.20.4.84) (4.87-5,62) (5,7 .6.69) (6.51-T55) (7.24 0.43) (7,99.9.35) (9.84.117)
2-day 4.237.26
10.1 12.4
4. 80 3.27.3.78 3.944.56 935.69 8.37.978 9.23 Iola
3-day 3.47-400) 4.64962) (5 9.5r98 (5.97-89) 7.04.8.14 7.87 9314 (8 3-0.2) I)W-1.2 {10.8.2.7 11.7-1111
4-day (3.68422) 1 (4 2-507) 1 (5.44.6.26) (6.25720) 11 (7:5.8.49) (8.09851) 1(9.09a10.6) (9.98-1�1.6) (11.2-3.1) (12.1-14.3)
7-dayM
5.45 6.64 7.59 8.87 9.89 10.9 12.0 13.5 14.6
(5.11-5.80) (6.22.7.DS (7.09-807) (8.27.9.43) 19.20.10.5) (101.11.6) (11.1-12.8) 112.4-14.4) (13.4-15 6)
a.2a 7.45 9.42 9.73 Iola i1.e 12.$ 14.2 15.4
5.95 8.58 .02.7.91 7 93-8.94 9.14-10.3 10 1-11.4 11 0-12.5) 2.0-13.6 132-15.2 i4.2-18.4
20 day 6.96 8.23 9.71 10.9 12.4 133 14.9 16.1 17.8 19.1
6.60-7.34 80-8.67 920-10.2 10.3-11,5 117-13.1 129-14.4 14.0-15.7 15.1-17.0 16.6-16.9 17.6-20.3
8.
30 day (8 14 8.95) (9.58-0.5) (11111 2.2) (12.3 15) 1 (15.0-6.5) 1 (16 1-7.8) (17,2-9,1) (18.7-0.9) (19 8,22.2)
45-day 10.8 12.6 14.4 15.7 17.4 18.8 2010 21.3 22.9 24.2
(10.3.11.3) (12.1-13.2) (137.15.0) 115.0.,6.4} 06.6.18.2) (179.19.6) (191.21.0} (202.22.3) (21.7.24.0) (22.8.25.4)
60-day 12.8 15.0 16.9 18.3 20.2 21.7 23.0 24.4 26.1 27.4
(12.3-13.4) (14.4-15.6) (16.2-17.6) (17.6-19.1) (194-21 1) (20 7-22.6) (22.0 24 0) (23.3-25A) (24.8-27.3) (26.0.28.7)
'Precipitation frequency(PF)estimates in this table are based on frequency analysis or partial duration series(PDS).
umbers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval The probability that precipitation frequency estimates
!or a given duration and average recurrence Interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds
re not checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values.
Neese refer to NOAA Atlas 14 document for more Information
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Precipitation Frequency Data Server Page 2 of 4
PF graphical
PDS-based depth-duration-frequency(DDF)curves
Latitude 35 42290,Longitude •81 2997'
30
Averap tecuaence
25 ........................ .. eHerval
(yea-)
c
20 ... .. .. ...
a —
va 5
15 :...:............:.....:...:............. .. — to
: 50
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�" 500
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E E •E .� E t s sry � m m m o � m m m m
W W Duration ~ N
30
25 .................. ................
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Duration
$ .... .......: .......f- .- ......;......
d -- 5-min --- 2-day
9
t0imin — 3-day
15-min — 4-day
30-min — 7-day
.0 10 . ........... ,.---,.--.. —
- = 60�rNn 10-ctay
2-hr — 20-day
5 — 3-hr 3"ay
— "r — 48-day
124V — 40-day
0 — 24-W
1 2 ., 5 10 25 50 100 200 500 1000
Average recurrence interval(years)
NOAA Atlas 14,Volume 2.Version 3 Created(GMT? Thu Jan 28 14 34 32 2021
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Maps&aerials
Small scale terrain
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La a scale aerial
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US Depamrngnt of Commerce
National Oceanic and Atmospheric Admini$lation
National Weather Service
al,o;ai !Laietsn;o=
1325 East West Highway
Silver Spring MD 20910
Questions? HIDSC.QuestionsiMnoes,j3ov
Disdaimer
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Hydrologic Soil Group—Gaston County,North Carolina Piedmont Lithium
Hydrologic Soil Group
Map unit symbol Map unit name hating Acres In AOI Percent of AOI
CeB2 Cecil sandy clay loam,2 B 1885 14.8%
to 8 percent slopes,
moderately eroded
CeD2 Cecil sandy clay loam,8 B 44.4 3.5%
to 15 percent slopes,
moderately eroded
ChA Chewacla loam,0 to 2 B/D 47.2 3.7%
percent slopes
frequently flooded
CoA Congaree loam,0 to 2 C 110.7 8.7%
percent slopes,
occasionally flooded
HeB Helena sandy loam,1 to D 12.1 1.0%
6 percent slopes
LdB2 Lloyd sandy clay loam,2 B 398.4 31.4%
to 8 percent slopes,
t moderately eroded
LdD2 Lloyd sandy clay loam,8 B 192.6 15.2%
I to 15 percent slopes,
i! moderately eroded
MaB2 Madison sandy Gay B 6.9 0.5%
loam 2 to 8 percent
slopes,moderately
eroded
MaD2 `Madison sandy clay B 14.4 1.1%
loam,8 to 15 percent
slopes,moderately
eroded
i PaD2 Pacolet sandy clay B 7.81 0.6%
loam 8 to 15 percent
slopes.moderately
eroded
PaE Pacolet sandy loam.15 B 1807 14.2%
to 25 percent slopes
PaF Pacolet sandy loam,25 B 22.4 1.8%
to 45 percent slopes
TAB ;Tatum gravelly loam,2 B 0.0 0.0%
to 8 percent slopes
Ud Udorthents,loamy C 43.5 3.4%
Totals for Area of Interest 1,269.9 100.0%
tisriA Natural Resources Web Soil Survey 1/28/2021
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group--Gaston County,North Carolina Piedmont Lithium
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storms.
The soils in the United States are assigned to four groups(A, B, C, and D) and
three dual classes(AID, BID, and CID).The groups are defined as follows:
Group A. Soils having a high infiltration rate(low runoff potential)when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission,
Group B. Soils having a moderate infiltration rate when thoroughly wet.These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential)when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (AID, BID. or CID), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff-None Specified
Tie-break Rule: Higher
us
Natural Resources Web Soil Survey 1/28/2021
Conservation Service National Cooperative Soil Survey Page 4 of 4

Appendices
Table 8.03e Runoff curve numbers of urban areas'
Curve number for
^over Description hydrologic soil group
Average percent
Cover type and hydrologic condition impervious areal A 8 C D
Fully developed urban areas(vegetation established)
Open space(lawns, parks, golf courses, cemeteries, etc.)':
Poor condition (grass cover< 50%) ............................. 68 79 86 89
Fair condition (grass cover 50%to 75%) ..................... 49 69 79 84
Good condition (grass cover>75%) ............................ 39 61 74 80
Impervious areas:
Paved parking lots, roofs, driveways, etc. 98 98 98 98
(excluding right-of-way) ...............................................
Streets and roads:
Paved; curbs and storm sewers(excluding 98 98 98 98
right-of-way) ...................•..............................................
Paved; open ditches (including right-of-way) ................ 83 89 92 93
Gravel (including right-of-way) ...................................... 76 85 89 91
Dirt(including right-of-way) ........................................... 72 82 87 89
Urban districts:
Commercial and business ................................................. 85 89 92 94 95
Industrial ........................................................... ............... 72 81 88 91 93
Residential districts by average lot size:
118 acre or less (town houses) ......................................... 65 77 85 90 92
114 acre ............................................................................ 38 61 75 83 87
113 acre ............................................................................. 30 57 72 81 86
1/2 acre ............................................................................. 25 54 70 80 85
1 acre........................................................•.... .......... 20 51 68 79 84
2 acres .............................................................................. 12 46 65 77 82
Developing urban areas
Newly graded areas
(pervious areas only, no vegetation}" ., 77 86 91 94
Idle lands (CN's are determined using cover types
similar to those in table 2-2c).
1.Average runoff condition,and la=0.2S.
2.The average percent impervious area shown was used to develop the composite CN's Other assumptions are as follows.impervious
areas are directly connected to the drainage system,Impervious areas have a CN of 98.and pervious areas are considered equivalent
to open space in good hydrologic condition CN's for other combinations of conditions may be computed using Figure 8.03c or 8.03d
3.CN's shown are equivalent to those of pasture.Composite CN's may be computed for other combinations of open space cover type.
4.Composite CN's to use for the design of temporary measures during grading and construction should be computed using Figure 8.03c
or 8.03d based on the degree of development(impervious area percentage)and the CN's for the newly graded pervious areas
Rev.6/06 9.03.17

Table 8.03f Runoff curve numbers for cultivated agriculture lands'
Curve numbers for
Cover description hydrologic soil groups
Hydrologic
Cover type Treatments2 conditions' A B C 0
Fallow Bare soil 77 86 91 94
Row crops Straight row Good 67 78 85 89
Contoured & Good 62 71 78 81
terraced
1 Average runoff condition, and 1a=0.2S
2 Crop residue cover applies only if residue is on at least 5% of the surface throughout the year.
3 Hydraulic condition is based on combination factors that affect infiltration and runoff, including(a)density
and canopy of vegetative areas, (b) amount of year-round cover, (c) amount of grass or close-seeded
legumes, (d) percent of residue cover on the land surface (good 2: 20%), and (e) degree of surface
roughness,
Poor: Factors impair infiltration and tend to increase runoff.
Good; Factors encourage average and better than average infiltration and tend to decrease runoff,
8.03.18 Rev.6/06

Appendices
Table 8.03g Runoff curve numbers for other agriculture lands'
Curve numbers for
Cover description hydrologic soil groups
Hydrologic
Cover type conditions3 A B C D
Pasture. grassland, or range— Poor 68 79 86 89
continuous forage for grazing. Y
Fair 49 69 79 84
Good 39 61 74 80
Meadow--continuous grass, protected — 30 58 71 78
from grazing and generally mowed for
hay.
Brush—brush-weed-grass mixture with Poor 48 67 77 83
brush the major element. 3
Fair 35 56 70 77
Good 304 48 65 73
Woods—grass combination (orchard or Poor 57 73 82 86
tree farm)_ 5
Fair 43 65 76 82
Good 32 58 72 79
Woods, " Poor 45 66 77 83
Fair 36 60 73 79
Good 304 55 70 77
Farmsteads—buildings- lanes, — 59 74 82 86
driveways, and surrounding lots.
1 Average runoff condition, and I.=0.2S.
2 Poor, <50%ground cover or heavily grazed with no mulch.
Fair 50 to 75%ground cover and not heavily grazed,
Good.>75%ground cover and lightly or only occasionally grazed.
3 Poor. <50516 ground cover.
Fair. 50 to 7511/6 ground cover
Good>75%ground cover.
4 Actual curve number is less than 30; use CN=30 for runoff computations.
5 CN's shown were computed for areas with 50%woods and 50%grass(pasture)cover Other combinations of
conditions may be computed from the CN's for woods and pasture.
6 Poor Forest litter, small trees. and brush are destroyed by heavy grazing or regular burning
Fair. Woods are grazed but not burned,and some forest litter covers the soil
Good-Woods are protected from grazing, and litter and brush adequately cover the soil
Rev.W06 8.03.19

Urban impervious area modifications
Several factors, such as the percentage of impervious area and the means of
conveying runoff from impervious areas to the drainage system, should be
considered in computing CN for urban areas(Rawls et al., I981).For example,
do the impervious areas connect directly to the drainage system, or do they
outlet onto lawns or other pervious areas where infiltration can occur?
Connected impervious areas - An impervious area is considered connected
if runoff from it flows directly into the drainage system. It is also considered
connected if runoff from it occurs as concentrated shallow flow that runs over
a pervious area and then into the drainage system.
Urban CN's (Table 8.03e) were developed for typical land use relationships
based on specific assumed percentages of impervious area. These CN vales
were developed on the assumptions that(a)pervious urban areas are equivalent
to pasture in good hydrologic condition and (b) impervious areas have a
CN of 98 and are directly connected to the drainage system. Some assumed
percentages of impervious area are shown in Table 8.03e.
If all of the impervious area is directly connected to the drainage system,but
the impervious area percentages or the pervious land use assumptions in Table
8.03e are not applicable, use Figure 8.03c to compute a composite CN. For
example, Table 8.03e gives a CN of 70 for a 1-2-acre lot in HSG B, with
assumed impervious area of 25 percent. However, if the lot has 20 percent
impervious area and a pervious area CN of 61, the composite CN obtained
from Figure 8.03c is 68. The CN difference between 70 and 68 reflects the
difference in percent impervious area.
Unconnected impervious areas Runoff from these areas is spread over a
pervious area as sheet flow.To determine CN when all or part of the impervious
area is not directly connected to the drainage system, (1) use Figure 8.03d if
total impervious area is less than 30 percent or(2)use Figure 8.03c if the total
impervious area is equal to or greater than 30 percent, because the absorptive
capacity of the remaining pervious areas will not significantly affect runoff.
When impervious area is less than 30 percent, obtain the composite CN by
entering the right half of Figure 8.03d with the percentage of total impervious
area and the ratio of total unconnected impervious area to total impervious
area. Then move left to the appropriate pervious CN and read down to find
the composite CN. For example, for a 1:2-acre lot with 20 percent total
impervious area (75 percent of which is unconnected) and pervious CN of
61,the composite CN from Figure 8.03d is 66.If all of the impervious area is
connected,the resulting CN(from Figure 8.03c)would be 68.
8.03.20 Rev.6106