20241002_ESC_Calcs

Erosion Control
Supporting Calculations
For
Keller Minim, Inc.
Mine Operator
Keller Minim-Sand & Recycle
Mine Name
5830 Wright Road, Kannapolis,NC 28081
Project Address
NCG020000
NPDES General Permit for Mining
September 17, 2024
Date
Plans Prepared By:
``�,,�1111111 i it+�l ff
C q �%
SEaunn=LL
L
13963
engineering • ��
P.0 Box 790 %NY L
Charlotte,NC 28203
704-655-7290
NC Firm No.C-0984
1

Table of Contents
I. Report Summary
APPENDICIES
II. SEDCAD Computer Models
A. Pond Nos. P-1, P-2, and P-3-10 Yr/24Hr Storm Event
i. Storm Information
ii. Particle Size Distribution
iii. Structure Networking
iv. Structure Summary
v. Structure Details
vi. Pond Results
vii. Detailed Discharge Tables
viii. Subwatershed Details
B. Pond Nos. P-1, P-2, and P-3-25 Yr/24Hr Storm Event
i. Storm Information
ii. Particle Size Distribution
iii. Structure Networking
iv. Structure Summary
v. Structure Details
vi. Pond Results
vii. Detailed Discharge Tables
viii. Subwatershed Details
ix. Stage-Storage Curves for P-1, P-2 & P-3
C. Outlet Protection-10 Yr/24Hr Storm Event
i. Plunge Pool Results
ii. Emergency Spillway Channel Rip-Rap
2

I. REPORT SUMMARY
Project Description:
The proposed mining operation is located on the Enochville,NC USGS
quadrangle in Rowan County,North Carolina. The proposed mine is shown on the
attached Cover Sheet C-100.
The mine is applying for a mine permit. The applicant sent a Notice of Intent
(NOI) in October 2023 for storm water discharge from the mine pit is regulated under the
NPDES General Permit#NCG020000. The mine is proposing to excavate and disturb an
approximate 27.2 acres plus berms and buffers outlining he mine area containing an
additional 27.2 acres, and future reserve area of 13.4 acres permitting a total of 68.3
acres. The total disturbance of the proposed mining area will contribute approximately
30.4 acres into three sediment ponds in series, referenced as Pond Nos. P-1, P-2 and P-3.
The design of this storm water management system is to control the Total
Suspended Solids for the 10-yr/24-hr and 25-yr/24-hr event created by the proposed mine
operation. Pond P-1 is designed to allow sand recovery from the site and the proposed
Process washing area utilizing a screw wash, a screen area, and mobile concrete crusher.
The system is designed for stormwater runoff to enter the tailings pond area by overland
flow. The designated tailings ponds P-1, P-2, and P-3 all utilize circular riser pipes with
orifices as shown in detail on Sheet C-501 to control the runoff outflow. Controlled
release from the tailings ponds are connected with barrel piping with inverts set above the
anticipated sediment storage loads to minimize potential sedimentation within the barrels.
Outlet protection or plunge pools have been added to minimize the potential internal
pond erosion resulting from the higher velocity discharge of water from the barrel outlets.
One floating siphon is proposed within P-3. The tailings pond P-1 will be utilized to
recover washed sand for resale. Ponds P-2 and P-3 are designed to settle out silts from the
operation.
II. SEDCAD Hydrologic and Sedimentation Model:
The volume of sediment run-off from the subject site has been estimated, based on an
hydrology and sedimentology computer model, using SEDCAD Version 4. The model is
supported by research efforts performed at the Agricultural Engineering Department of the
University of Kentucky and the Office of Surface Mining. Recently, other regulatory
agencies, such as the State of South Carolina adopted the SEDCAD design technique for
designing erosion control plans.
3

1.0 Design Basis
The volume of soil erosion has been estimated based on the Williams'
modified universal soil loss equation, RUSLE. The basic design estimated soil losses based
on the following parameters:
A Area of Disturbance R Rainfall Intensity
K Soil-Erodibility Factor CP Erosion Control Practice Factor
L Slope Length S Slope Gradient
PSD Particle Size Distribution SG Specific Gravity of Soil
2.0 Soil and Rainfall Data
According to the Rowan County SCS Soil Survey, the soils within the
watershed are identified as the Rion and Wedowee series. The soils are classified as well
drained or Hydrologic Class B (K=0.20 to 0.26). Two (2) soil samples were collected from
the proposed pit area for grain size analysis and a comparison made with the characteristics
of the Rion and Wedowee series. The soils sampling locations are shown on the attached
C-205, referenced as S-2. A grain size distribution test for each soil sample was performed
and results are shown in Appendix A. Therefore, for the purpose of this study, the soils
within the watershed were tested for grain size for sedimentation modeling. Results of the
grain size distribution are contained in Appendix A.
Rainfall data for the area was obtained from the NOAA Atlas Chart 14, Kannapolis,
North Carolina.
3.0 Predicted Sediment Discharge
The quantity of sediment eroding from the subj ect site and from other areas within
the watershed has been estimated using the SEDCAD computer model. Two (2) storm
events were selected,based on the 10 yr/24-hr(Appendix A)and the 25 yr/24-hr (Appendix
B) events for a rainfall of 5.07 inches and 6.01 inches,respectively.
Results of the sedimentation model shows the proposed ponds to provide 80%
removal of Total Suspended Solids. The model predicts a discharge of 6 ml/1 of TSS. The
results is less than 100 ml/l allowed by the General Mining Permit limitations for NPDES
discharges.
Pond design data for construction of the tailings ponds are summarized on Sheet C-
501.
4.0 Outlet Protection
Outlet protection data sheet for barrels P-1, P-2, and P-3 is shown on Sheet C-501
including specifications.
4

APPENDIX

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Keller Mining.sand Mine & Rec le
Kannapolis, NC
MGE Pro '. 220703.440
10 YR124 HR STORM
Jerry L. Meade
MEADE GUNNELL Engineering, PC
P.O. Box 790
Cornelius, NC 28031
Phone: [phone]
Email: [e-mail]
Filename: KellerMiningKannapolisMod2.sc4 Printed 09-16-2024

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Genera/Information
Storm Information:
Storm Type: NRCS Type II
Design Storm: 10 yr-24 hr
Rainfall Depth: 5.070 inches
Particle Size Distribution;
Size(mm) S-2
9.5000 100.000%
4.7500 97.000%
2.0000 64.700%
0.4250 54.000%
0.1500 36.700%
0.0750 29.000%
0.0184 20.700%
0.0056 15.600%
0.0012 14.400%
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Particle Size Analysis
O O O
O O O O O O It_
410t
100
I I I I I I I I I I I
90 I I I I I I I I I I I I I I
80
70
Z_ 60
I I I I I I I I I I I
U`' I I I
Z 50
W I I I
w40 I I I I
a I I I I I I I I I I
30
I I I I I I I
I I I I I I I I
20
I I I I I I I I I I I I I I
I I I I I I I I I I I I I
10
I I I I I I I I I
0
100 10 1 0.1 0.01 0.001
GRAIN SIZE-mm.
+3„ %Gravel %Sand %Fines
Coarse Fine Coarse Medium Fine Silt Clay
0.0 0.0 3.0 32.1 10.9 25.0 13.6 15.4
SIEVE PERCENT SPEC.* PASS? Material Description
SIZE FINER PERCENT (X=NO) Yellowish red,silty clayey SAND
3/8" 100.0
#4 97.0
#10 64.9 Atterbera Limits
#40 54.0 pL= LL= Pl=
#100 36.7
#200 29.0 Coefficients
.0386 mm. 25.2 D90= 3.7810 D85= 3.3288 D60= 0.7451
.0281 mm. 23.2 D50= 0.3094 D30= 0.0854 D15= 0.0023
.0184 mm. 20.7 D10= CU= Cc=
.0109 mm. 18.8 Classification
.0079 mm. 16.9 USCS= SC-SM AASHTO=
.0056 mm. 15.6
.0028 mm. 15.1 Remarks
.0012 mm. 14.4 Sample delivered to KEG by Mr.Jerry Meade,P.E.with
Meade Gunnell Engineering.
(no specification provided)
Source of Sample: Keller Mining
Sample Number: S-2 Date: 11/18/2022
Kesse I Engineering Group Client: Meade Gunnell Engineering
Project: Meade Pit Study
Project No: JM22-4547-01 Figure

NRCS Type 11, 10 yr - 24 h r Storm
1 .0
0.8 . . . . � . . . . . . . . . : . . . . r . . . . . . . . . .,. . .. . . . . .,. . . . ... . . . .•. . . . •.. . • •
0.6 . . . . . . . . . . . . . . . . . .. . . . . .. . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-0
ED0.4 . . . . : . . . . ; . . . . : . . . . ; . . . . : . . . . . . . . . . . ; . . . , . . . : . . . . . .
0.2 . . . . ; . . . . ; . . . . : . . . . . . . . . . . . . . . . . . ; . . . ; . . . ; . . . ; . . .
Q
. . . . . . . . . .
0.0
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hrs)

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Structure Networking:
Stru (flows Stru Musk. K
Type # into) # (hrs) Musk.X Description
Pond #1 ==> #2 0.000 0.000 P-1
Pond #2 ==> #3 0.000 0.000 P-2
Pond #3 ==> End 0.000 0.000 P-3
#1
Pond
#2
Pond
#3
Pond
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Structure Summary:
Immediate Total Total Peak Peak
Peak Contributing Contributing Runoff Sediment Sediment Settleable 24VW
Area Area DischargeVolume (tons) Conc. Conc. (MI/1)
(ac) (ac) (cfs) (ac-ft) (m9/1) (MI/1)
In 30.12 2.59 62.3 35,566 23.08 11.35
#1 9.800 9.800
Out 24.87 2.52 10.7 4,923 0.13 0.09
In 42.70 4.05 68.3 351613 19.65 7.14
#2 5.600 15.400
Out 30.47 3.72 20.9 7,941 0.27 0.15
In 75.56 7.79 68.1 151240 6.99 3.07
#3 15.000 30.400
Out 3.69 3.24 13.4 4,666 0.00 0.00
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Particle Size Distribution(s) at Each Structure
Structure #1 (P-1)NAV
Size(mm) In Out
9.5000 100.000% 100.000%
4.7500 97.024% 100.000%
2.0000 64.716% 100.000%
0.4250 54.013% 100.000%
0.1500 36.709% 100.000%
0.0750 29.007% 100.000%
0.0184 20.705% 100.000%
0.0056 15.604% 91.245%
0.0012 14.404% 84.226%
Structure #2 (P-2)0
Size(mm) In Out
9.5000 100.000% 100.000%
4.7500 97.490% 100.000%
2.0000 70.220% 100.000%
0.4250 61.186% 100.000%
0.1500 46.580% 100.000%
0.0750 40.080% 100.000%
0.0184 33.072% 100.000%
0.0056 27.401% 89.469%
0.0012 25.293% 82.586%
Structure #3:
Size(mm) In Out
9.5000 100.000% 100.000%
4.7500 98.083% 100.000%
2.0000 75.699% 100.000%
0.4250 68.261% 100.000%
0.1500 56.235% 100.000%
0.0750 50.882% 100.000%
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Size(mm) In Out
0.0184 45.112% 100.000%
0.0056 38.331% 100.000%
0.0012 35.383% 100.000%
Filename: KellerMiningKannapolisMod2.sc4 Printed 09-16-2024

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Structure Detail;
Structure #1 (Ponds
P-1
Pond Inputs:
Initial Pool Elev: 769.00 ft
Initial Pool: 0.10 ac-ft
*Sediment Storage: 0.28 ac-ft
Dead Space: 65.00 0/0
*Sediment capacity was entered by user
Perforated Riser
Riser Barrel Number of
Riser Height Barrel Barrel Slope Spillway Elev
Diameter (ft) Diameter Length(ft) (0/0) Manning s n (ft) Holes per
(in) (in) Elev
36.00 3.00 24.00 75.00 1.00 0.0150 770.00 2
Emergency Spillwa�r
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
771.00 10.00 3.00:1 3.00:1 8.00
Pond Results:
Peak Elevation: 770.90 ft
H'graph Detention Time: 3.09 hrs
Pond Model: CSTRS
Dewater Time: 1.64 days
Trap Efficiency: 82.90
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table
Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-ft) (cfs) (hrs)
768.68 0.298 0.000 0.000 Top of Sed. Storage
769.00 0.323 0.098 0.000 Low hole SPW#1
769.50 0.365 0.270 0.149 14.00*
770.00 0.410 0.464 0.210 13.20 Spillway#1
770.50 0.459 0.681 10.330 11.95
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Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-ft) (cfs) (hrs)
770.90 0.501 0.876 24.865 0.30 Peak Stage
771.00 0.511 0.924 28.411 Spillway#2
771.50 0.566 1.193 31.567
772.00 0.623 1.490 56.272
772.50 0.700 1.820 88.414
Detailed Discharge Table
Combined
Elevation Emergency Total
O S ft Perf. Riser(cfs) Spillway cfs
P y(cfs) Discharge
(cfs)
768.68 0.000 0.000 0.000
769.00 2.00>0.000 0.000 0.000
769.50 0.149 0.000 0.149
770.00 0.210 0.000 0.210
770.50 10.330 0.000 10.330
771.00 28.411 0.000 28.411
771.50 29.869 1.698 31.567
772.00 31.259 25.013 56.272
772.50 32.590 55.824 88.414
Structure #2 (Rondl
PZ
Pond Inputs:
Initial Pool Elev: 767.50 ft
Initial Pool: 0.23 ac-ft
*Sediment Storage: 0.18 ac-ft
Dead Space: 75.00 0/01
*Sediment capacity was entered by user
Perforated Riser
Riser Barrel Number of
Riser Height Barrel Barrel Slope Spillway Elev
Diameter (ft) Diameter Length(ft) (%) Manning s n (ft) Holes per
(in) (in) Elev
36.00 3.50 24.00 75.00 1.00 0.0150 768.50 2
Emergency Spillway
Filename: KellerMiningKannapolisMod2.sc4 Printed 09-16-2024

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Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width(ft)
769.50 10.00 3.00:1 3.00:1 8.00
Pond Results:
Peak Elevation: 769.67 ft
H'graph Detention Time: 0.60 hrs
Pond Model: CSTRS
Dewater Time: 3.83 days
Trap Efficiency: 69.37%
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table
Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-ft) (cfs) (hrs)
766.59 0.221 0.000 0.000 Top of Sed. Storage
767.00 0.251 0.096 0.000
767.50 0.291 0.231 0.000 Low hole SPW#1
768.00 0.334 0.388 0.037 50.87*
768.50 0.365 0.562 0.053 40.24* Spillway#1
769.00 0.397 0.753 10.330 0.22*
769.50 0.431 0.960 29.217 0.50 Spillway#2
769.67 0.443 1.035 30.468 0.10 Peak Stage
770.00 0.466 1.184 32.957
770.50 0.483 1.421 57.603
771.00 0.500 1.667 89.692
*Designates times)to dewater have been extrapolated beyond the 50 hour hydrograph limit.
Detailed Discharge Table
Combined
Elevation Emergency Total
O Spillway cfs
ft Perf. Riser(cfs) a P _ ) Discharge
(cfs)
766.59 0.000 0.000 0.000
767.00 0.000 0.000 0.000
767.50 1.00>0.000 0.000 0.000
768.00 0.037 0.000 0.037
768.50 0.053 0.000 0.053
769.00 10.330 0.000 10.330
Filename: KellerMiningKannapolisMod2.sc4 Printed 09-16-2024

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Combined
Elevation Emergency Total
ft Perf. Riser(cfs)O Spillway cfs p y(cfs) Discharge
(cfs)
769.50 29.217 0.000 29.217
770.00 31.259 1.698 32.957
770.50 32.590 25.013 57.603
771.00 33.868 55.824 89.692
Structure #3(Ponds
P-3
Pond Inputs:
Initial Pool Elev: 764.00 ft
Initial Pool: 0.28 ac-ft
*Sediment Storage: 0.50 ac-ft
Dead Space: 85.00
*Sediment capacity was entered by user
Perforated Riser
Riser Barrel Number of
Riser Height Barrel Barrel Slope Spillway Elev
Diameter (ft) Diameter Length(ft) (%) Manning s n (ft) Holes per
(in) (in) Elev
36.00 9.00 24.00 100.00 1.00 0.0150 770.50 2
Floating Siphon
Crest Elev Inlet Elev Outlet Elev Di(meter Length (ft) Manning's n
768.00 764.00 763.00 2.00 10.00 0.0140
Emergency Spillway
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width(ft)
771.00 10.00 3.00:1 3.00:1 8.00
Pond Results:
Peak Elevation: 770.66 ft
H'graph Detention Time: 10.09 hrs
Pond Model: CSTRS
Dewater Time: 8.54 days
Trap Efficiency: 80.39
Dewatering time is calculated from peak stage to lowest spillway
Filename: KellerMiningKannapolisMod2.sc4 Printed 09-16-2024

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Elevation-Capacity-Discharge Table
Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-ft) (cfs) (hrs)
763.47 0.465 0.000 0.000 Top of Sed. Storage
763.50 0.471 0.013 0.000
764.00 0.593 0.279 0.000 Low hole SPW#1
764.50 0.625 0.583 0.173 21.33*
765.00 0.658 0.904 0.206 18.80*
765.50 0.691 1.241 0.235 17.35*
766.00 0.726 1.596 0.261 16.43*
766.50 0.758 1.967 0.305 14.70*
767.00 0.791 2.354 0.336 13.95*
767.50 0.825 2.758 0.363 13.46*
768.00 0.859 3.179 0.388 13.13* Spillway#2
768.50 0.904 3.619 0.432 12.35*
769.00 0.950 4.083 0.462 12.13*
769.50 0.997 4.569 0.489 12.03*
770.00 1.045 5.080 0.515 12.00*
770.50 1.092 5.614 0.539 17.65 Spillway#1
770.66 1.108 5.787 3.688 9.55 Peak Stage
771.00 1.141 6.172 10.696 Spillway#3
771.40 1.180 6.636 26.681
771.50 1.190 6.755 31.293
772.00 1.240 7.362 67.087
*Designates times)to dewater have been extrapolated beyond the 50 hour hydrograph limit;
Detailed Discharge Table
Combined
Elevation Perf. Riser(cfs) Floating Siphon Emergency Total
ft O cfs Spillway cfs(cfs) P Y(cfs) Discharge
(cfs)
763.47 0.000 0.000 0.000 0.000
763.50 0.000 0.000 0.000 0.000
764.00 0.75>0.000 0.000 0.000 0.000
764.50 0.021 0.152* 0.000 0.173
765.00 0.030 0.177* 0.000 0.206
765.50 0.036 0.199* 0.000 0.235
766.00 0.75>0.042 0.219* 0.000 0.261
766.50 0.068 0.238* 0.000 0.305
767.00 0.081 0.255* 0.000 0.336
767.50 0.091 0.272* 0.000 0.363
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Combined
Elevation Perf. Riser(cfs) Floating Siphon Emergency Total
(ft) (cfs) Spillway(cfs) Discharge
(cfs)
768.00 0.75>0.101 0.287 0.000 0.388
768.50 0.130 0.301 0.000 0.432
769.00 0.147 0.315 0.000 0.462
769.50 0.161 0.329 0.000 0.489
770.00 0.173 0.341 0.000 0.515
770.50 0.185 0.354 0.000 0.539
771.00 10.330 0.366 0.000 10.696
771.40 24.947 0.375 1.359 26.681
771.50 29.217 0.378 1.698 31.293
772.00 41.684 0.389 25.013 67.087
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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) Number
(hrs) (cfs) (ac-ft)
#1 1 0.600 0.001 0.096 0.242 86.000 TR55 2.03 0.176
2 6.100 0.115 0.000 0.000 86.000 TR55 20.68 1.794
3 3.100 0.093 0.092 0.267 74.000 TR55 8.01 0.624
9.800 30.12 2.594
#2 1 0.800 0.001 0.123 0.231 86.000 TR55 2.71 0.235
2 3.500 0.039 0.000 0.000 86.000 TR55 11.87 1.029
3 1.300 0.062 0.034 0.284 74.000 TR55 3.36 0.262
15.400 42.70 4.050
#3 1 1.830 0.092 0.060 0.307 86.000 TR55 6.20 0.538
2 9.370 0.118 0.000 0.000 86.000 TR55 31.76 2.756
3 3.800 0.163 0.091 0.267 74.000 TR55 9.08 0.778
30.400 75.56 7.790
Subwatershed Sedimentology Detail;
Peak Peak
Stru SWS Soil K L(ft) S(%) C P PS# Sediment Sediment Settleable 24VW
# # (tons) (MI/1)
(mg/0 (MI/1)
#1 1 0.170 50.00 33.00 0.4500 1.0000 1 15.9 116,892 75.87 41.52
2 0.170 100.00 5.00 0.4500 1.0000 1 34.0 25,027 16.24 8.97
3 0.240 100.00 5.00 0.3600 1.0000 1 12.5 28,080 18.23 9.48
62.3 35,566 23.08 11.35
#2 1 0.170 50.00 33.00 0.4500 1.0000 1 21.9 1201331 78.10 42.83
2 0.150 100.00 5.00 1.0000 1.0000 1 35.8 45,527 29.55 16.34
3 0.150 100.00 5.00 0.0060 1.0000 1 0.0 263 0.17 0.09
68.3 35,613 19.65 7.14
#3 1 0.240 100.00 33.00 0.0820 1.0000 1 21.6 52,860 34.31 18.80
2 0.170 100.00 2.00 0.4500 1.0000 1 22.2 10,718 6.96 3.84
3 0.240 100.00 5.00 0.0820 1.0000 1 3.4 6,101 3.92 2.07
68.1 15,240 6.99 3.07
IZ
Subwatershed Time of Concentration Details;
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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 24.00 48.00 7.070 0.001
alluvial valley fans
#1 1 Time of Concentration: 0.001
#1 2 5. Nearly bare and untilled, and 2.46 16.00 650.00 1.560 0.115
alluvial valley fans
#1 2 Time of Concentration: 0.115
#1 3 3.Short grass pasture 5.32 33.00 620.00 1.840 0.093
#1 3 Time of Concentration: 0.093
#2 1 5. Nearly bare and untilled,and 5.33 32.00 600.00 2.300 0.072
alluvial valley fans
#2 1 Time of Concentration: 0.001
#2 2 4. Cultivated,straight row 5.00 14.00 280.00 1.990 0.039
#2 2 Time of Concentration: 0.039
#2 3 3. Short grass pasture 5.00 20.00 400.00 1.780 0.062
#2 3 Time of Concentration: 0.062
#3 1 3.Short grass pasture 5.67 36.00 635.00 1.900 0.092
#3 1 Time of Concentration: 0.092
#3 2 5. Nearly bare and untilled,and 2.00 12.00 600.00 1.410 0.118
alluvial valley fans
#3 2 Time of Concentration: 0.118
#3 3 2. Minimum tillage cultivation 4.72 30.00 635.00 1.080 0.163
#3 3 Time of Concentration: 0.163
Subwatershed Muskingum Routing 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 2.55 14.00 550.00 1.590 0.096
alluvial valley fans
#1 1 Muskingum K: 0.096
#1 3 5. Nearly bare and untilled,and 32.73 18.00 55.00 5.720 0.002
alluvial valley fans
5. Nearly bare and untilled,and 2.40 12.00 500.00 1.540 0.090
alluvial valley fans
#1 3 Muskingum K: 0.092
#2 1 5. Nearly bare and untilled,and 2.33 14.00 600.00 1.520 0.109
alluvial valley fans
#2 1 Muskingum K: 0.123
#2 3 5. Nearly bare and untilled,and 5.00 14.00 280.00 2.230 0.034
alluvial valley fans
#2 3 Muskingum K: 0.034
#3 1 5. Nearly bare and untilled,and 32.00 16.00 50.00 5.650 0.002
alluvial valley fans
5. Nearly bare and untilled,and 5.88 30.00 510.00 2.420 0.058
alluvial valley fans
#3 1 Muskingum K: 0.060
Filename:KellerMiningKannapolisMod2.sc4 Printed 09-16-2024

SEDCAD 4 for Windows
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Stru SWS Vert. Dist. Horiz. Dist. Velocity
# # Land Flow Condition Slope(%) (ft) (ft) (fps) Time(hrs)
#3 3 S. Nearly bare and untilled,and 32.00 16.00 50.00 5.650 0.002
alluvial valley fans
5. Nearly bare and untilled, and 2.55 13.00 510.00 1.590 0.089
alluvial valley fans
#3 3 Muskingum K: 0.091
Filename:KellerMiningKannapolisMod2.sc4 Printed 09-16-2024

-- APPENDIX B

SEDCAD 4 for Windows
('.nnvrinht 1QQR_gn1n Pnmoin i Crh%Alnh
1
Rec clKeller Minin -Sand Mine & e
Kanna ofis, NC
MGE Pro -. 220703.440
25 YR124 HR STORM
Jerry L. Meade
MEADE GUNNELL Engineering, PC
P.O. Box 790
Cornelius, NC 28031
Phone: [phone]
Email: [e-mail]
Filename: KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
(nnvrinh+1 QQR_gnl n Pamni� i Crh%Alnh
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General Information
Storm Information;
Storm Type: NRCS Type II
Design Storm: 25 yr-24 hr
Rainfall Depth: 6.010 inches
Particle Size Distribution;
Size(mm) S-2
9.5000 100.000%
4.7500 97.000%
2.0000 64.700%
0.4250 54.000%
0.1500 36.700%
0.0750 29.000%
0.0184 20,700%
0.0056 15,600%
0.0012 14.400%
Filename: KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
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Structure Networking:
Type Stru (flows Stru Musk. K Musk.X Description
# into) # (hrs)
Pond #1 ==> #2 0.000 0.000 P-1
Pond #2 ==> #3 0.000 0.000 P-2
Pond #3 =_> End 0.000 0.000 P-3
#z
Pond
Pond
#3
Pond
Filename: KellerMining Kan napolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
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Structure Summary:
Immediate Total Total Peak Peak
ContributingContributing
peak Discharge VRunoff olume Sediment Sediment Settleable 24VW
(tons) c. (MI/1)
(ac) (ac) (cfs) (ac-ft) (mg/1) (MI/1)
In 37.47 3.29 80.1 35,692 23.17 11.50
#1 9.800 9.800
Out 29.25 3.22 14.0 51204 0.18 0.12
In 51.31 5.15 87.2 30,958 17.02 7.09
#2 5.600 15.400
Out 39.31 4.81 27.3 71692 0.32 0.18
In 93.59 9.96 87.5 131940 6.38 3.08
#3 15.000 30.400
Out 10.89 5.40 23.0 4,520 0.00 0.00
Filename:KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
nnvrinhf 1 QQR_gnl n Pcimoln I Crh%Amh
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Particle Size Distribution(s) at Each Structure
Structure #1 (P-I)mIV
Size(mm) In Out
9.5000 100.000% 100.000%
4.7500 97.024% 100.000%
2.0000 64.716% 100.000%
0.4250 54.014% 100.000%
0.1500 36.709% 100.000%
0.0750 29.007% 100.000%
0.0184 20.705% 100.000%
0.0056 15.604% 89.234%
0.0012 14.404% 82.370%
Structure #2 (P-2).w
Size(mm) In Out
9.5000 100.000% 100.000%
4.7500 97.504% 100.000%
2.0000 70.381% 100.000%
0.4250 61.396% 100.000%
0.1500 46.870% 100.000%
0.0750 40.404% 100.000%
0.0184 33.435% 100.000%
0.0056 27.424% 87.693%
0.0012 25.314% 80.947%
Structure #3;
Size(mm) In Out
9.5000 100.000% 100.000%
4.7500 98.105% 100.000%
2.0000 75.835% 100.000%
0.4250 68.449% 100.000%
0.1500 56.509% 100.000%
0.0750 51.194% 100.000%
Filename: KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
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Size(mm) In Out
0.0184 45.465% 100.000%
0.0056 38.108% 100.000%
0.0012 35.176% 100.000%
Filename: KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
('.nmirinht 1 QQR_,)ni n Pmmnin i Cnh%Ainh
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Structure Detail;
Structure #1 (Pond1
P-1
Pond Inputs:
Initial Pool Elev: 769.00 ft
Initial Pool: 0.10 ac-ft
*Sediment Storage: 0.28 ac-ft
Dead Space: 65.00 0/0
*Sediment capacity was entered by user
Perforated Riser
Riser Barrel Number of
Riser Height Barrel Barrel Slope Spillway Elev
Diameter (ft) Diameter Length(ft) (0/0) Manning s n (ft) Holes per
(in) (in) Elev
36.00 3.00 24.00 75.00 1.00 0.0150 770.00 2
Emergency Spillway
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width(ft)
771.00 10.00 3.00:1 3.00:1 8.00
Pond Results:
Peak Elevation: 771.13 ft
H'graph Detention Time: 2.53 hrs
Pond Model: CSTRS
Dewater Time: 1.65 days
Trap Efficiency: 82.51
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table
Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-ft) (cfs) (hrs)
768.68 0.298 0.000 0.000 Top of Sed. Storage
769.00 0.323 0.098 0.000 Low hole SPW#1
769.50 0.365 0.270 0.149 14.00*
770.00 0.410 0.464 0.210 13.20 Spillway#1
770.50 0.459 0.681 10.330 11.90
Filename: KellerMining Kan napolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
f`nmirinht 1 QQR_9ni n Pmmnl� I CrhURnh
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Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-ft) (cfs) (hrs)
771.00 0.511 0.924 28.411 0.30 Spillway#2
771.13 0.526 0.995 29.247 0.10 Peak Stage
771.50 0.566 1.193 31.567
772.00 0.623 1.490 56.272
772.50 0.700 1.820 88.414
Detailed Discharge Table
Combined
Elevation Emergency Total
ft Perf. Riser(cfs) S cfs
( ) Spillway y(cfs) Discharge
(cfs)
768.68 0.000 0.000 0.000
769.00 2.00>0.000 0.000 0.000
769.50 0.149 0.000 0.149
770.00 0.210 0.000 0.210
770.50 10.330 0.000 10.330
771.00 28.411 0.000 28.411
771.50 29.869 1.698 31.567
772.00 31.259 25.013 56.272
772.50 32.590 55.824 88.414
Structure #2 (Pond)
P-2
Pond Inputs:
Initial Pool Elev: 767.50 ft
Initial Pool: 0.23 ac-ft
*Sediment Storage: 0.18 ac-ft
Dead Space: 75.00
*Sediment capacity was entered by user
Perforated Riser
Riser Barrel Number of
Riser Height Barrel Barrel Slope Spillway Elev
Diameter (ft) Diameter Length(ft) (%) Manning s n (ft) Holes per
(in) (in) Elev
36.00 3.50 24.00 75.00 1.00 0.0150 768.50 2
Emergency Spillway
Filename: KellerMining Kan napolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
('.nnvrinht 1 ooR_ni n Pnmain i .cz hiAinh
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Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width(ft)
769.50 10.00 3.00:1 3.00:1 8.00
Pond Results:
Peak Elevation: 770.13 ft
H'graph Detention Time: 0.52 hrs
Pond Model: CSTRS
Dewater Time: 3.84 days
Trap Efficiency: 68.73
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table
Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-ft) (cfs) (hrs)
766.59 0.221 0.000 0.000 Top of Sed. Storage
767.00 0.251 0.096 0.000
767.50 0.291 0.231 0.000 Low hole SPW#1
768.00 0.334 0.388 0.037 50.87*
768.50 0.365 0.562 0.053 40.24* Spillway#1
769.00 0.397 0.753 10.330 0.22*
769.50 0.431 0.960 29.217 0.40 Spillway#2
770.00 0.466 1.184 32.957 0.25
770.13 0.464 1.245 39.314 0.10 Peak Stage
770.50 0.483 1.421 57.603
771.00 0.500 1.667 89.692
Detailed Discharge Table
Combined
Elevation Perf. Riser(cfs) Emergency Total
O Spillway Y(cfs) Discharge
(cfs)
766.59 0.000 0.000 0.000
767.00 0.000 0.000 0.000
767.50 1.00>0.000 0.000 0.000
768.00 0.037 0.000 0.037
768.50 0.053 0.000 0.053
769.00 10.330 0.000 10.330
769.50 29.217 0.000 29.217
770.00 31.259 1.698 32.957
Filename: KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
f'nrnirinht 1 QQR_9ni n Pnmain i Crhuinh
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Combined
Elevation Emergency Total
ft Perf. Riser(cfs)( Spillway cfs) p y(cfs) Discharge
(cfs)
770.50 32.590 25.013 57.603
771.00 33.868 55.824 89.692
Structure #3 (Ponds
P-3
Pond Inputs:
Initial Pool Elev: 764.00 ft
Initial Pool: 0.28 ac-ft
*Sediment Storage: 0.50 ac-ft
Dead Space: 85.00%
*Sediment capacity was entered by user
Perforated Riser
Riser Barrel Number of
Riser Height Barrel Barrel Slope Spillway Elev
Diameter (ft) Diameter Length(ft) (%) Manning s n (ft) Holes per
(in) (in) Elev
36.00 9.00 24.00 100.00 1.00 0.0150 770.50 2
Floating Siphon
Crest Elev Inlet Elev Outlet Elev Di(meter Length(ft) Manning's n
768.00 764.00 763.00 2.00 10.00 0.0140
Emergency Spillwa�r
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width(ft)
771.00 10.00 3.00:1 3.00:1 8.00
Pond Results:
Peak Elevation: 771.00 ft
H'graph Detention Time: 6.43 hrs
Pond Model: CSTRS
Dewater Time: 8.64 days
Trap Efficiency: 73.74%
Dewatering time is calculated from peak stage to lowest spillway
Filename: KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
C'nnvrinhf 1ooR_9nin Pnmain i Crhulnh
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Elevation-Capacity-Discharge Table
Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-ft) (cfs) (hrs)
763.47 0.465 0.000 0.000 Top of Sed. Storage
763.50 0.471 0.013 0.000
764.00 0.593 0.279 0.000 Low hole SPW#1
764.50 0.625 0.583 0.173 21.33*
765.00 0.658 0.904 0.206 18.80*
765.50 0.691 1.241 0.235 17.35*
766.00 0.726 1.596 0.261 16.43*
766.50 0.758 1.967 0.305 14.70*
767.00 0.791 2.354 0.336 13.95*
767.50 0.825 2.758 0.363 13.46*
768.00 0.859 3.179 0.388 13.13* Spillway#2
768.50 0.904 3.619 0.432 12.35*
769.00 0.950 4.083 0.462 12.13*
769.50 0.997 4.569 0.489 12.03*
770.00 1.045 5.080 0.515 12.00*
770.50 1.092 5.614 0.539 17.65 Spillway#1
771.00 1.141 6.172 10.696 11.85 Spillway#3
771.00 1.141 6.178 10.886 0.15 Peak Stage
771.40 1.180 6.636 26.681
771.50 1.190 6.755 31.293
772.00 1.240 7.362 67.087
*Designates times)to dewater have been extrapolated beyond the 50 hour hydrograph limit.
Detailed Discharge Table
Combined
Elevation Floating Siphon Emergency Total
ft Perf. Riser(cfs) cfs Spillway cfs
O (cfs) p� Y(cfs) Discharge
(cfs)
763.47 0.000 0.000 0.000 0.000
763.50 0.000 0.000 0.000 0.000
764.00 0.75>0.000 0.000 0.000 0.000
764.50 0.021 0.152* 0.000 0.173
765.00 0.030 0.177* 0.000 0.206
765.50 0.036 0.199* 0.000 0.235
766.00 0.75>0.042 0.219* 0.000 0.261
766.50 0.068 0.238* 0.000 0.305
767.00 0.081 0.255* 0.000 0.336
767.50 0.091 0.272* 0.000 0.363
Filename: KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
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Combined
Elevation Perf. Riser(cfs) Floating Siphon Emergency Total
ft S
O (cfs) Spillway Y(cfs) Discharge
(cfs)
768.00 0.75>0.101 0.287 0.000 0.388
768.50 0.130 0.301 0.000 0.432
769.00 0.147 0.315 0.000 0.462
769.50 0.161 0.329 0.000 0.489
770.00 0.173 0.341 0.000 0.515
770.50 0.185 0.354 0.000 0.539
771.00 10.330 0.366 0.000 10.696
771.40 24.947 0.375 1.359 26.681
771.50 29.217 0.378 1.698 31.293
772.00 41.684 0.389 25.013 67.087
Filename: KellerMining Kan napolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
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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) Number
(hrs) (cfs) (ac-ft)
#1 1 0.600 0.001 0.096 0.242 86.000 TR55 2.49 0.220
2 6.100 0.115 0.000 0.000 86.000 TR55 25.30 2.244
3 3.100 0.093 0.092 0.267 74.000 TR55 10.32 0.824
9.800 37.47 3.289
#2 1 0.800 0.001 0.123 0.231 86.000 TR55 3.32 0.294
2 3.500 0.039 0.000 0.000 86.000 TR55 14.52 1.288
3 1.300 0.062 0.034 0.284 74.000 TR55 4.33 0.345
I-1 15.400 51.31 5.145
#3 1 1.830 0.092 0.060 0.307 86.000 TR55 7.59 0.673
2 9.370 0.118 0.000 0.000 86.000 TR55 38.86 3.448
3 3.800 0.163 0.091 0.267 74.000 TR55 11.90 1.027
30.400 93.59 9.962
Sub watershed Sedim en tology Detail;
Peak Peak
Stru SWS Soil K L(ft) S(%) C P PS# Sediment Sediment Settleable 24VW
# # (tons) Conc. Conc (MI/1)
(mg/1) (MI/1)
#1 1 0.170 50.00 33.00 0.4500 1.0000 1 20.1 118,388 76.84 42.00
2 0.170 100.00 5.00 0.4500 1.0000 1 43.1 25,299 16.42 9.10
3 0.240 100.00 5.00 0.3600 1.0000 1 16.8 28,274 18.35 9.66
80.1 35,692 23.17 11.50
#2 1 0.170 50.00 33.00 0.4500 1.0000 1 27.8 122,038 79.21 43.37
2 0.150 100.00 5.00 1.0000 1.0000 1 45.4 46,018 29.87 16.57
3 0.150 100.00 5.00 0.0060 1.0000 1 0.1 264 0.17 0.09
87.2 30,958 17.02 7.09
#3 1 0.240 100.00 33.00 0.0820 1.0000 1 27.4 53,522 34.74 19.06
2 0.170 100.00 2.00 0.4500 1.0000 1 28.2 10,835 7.03 3.89
3 0.240 100.00 5.00 0.0820 1.0000 1 4.7 61233 4.01 2.14
87.5 13,940 6.38 3.08
Subwatershed Time of Concentration Details;
Filename: KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
f'nnvrinht 1 QQR_,)ni n Pnmoln I Crhwnh
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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 24.00 48.00 7.070 0.001
alluvial valley fans
#1 1 Time of Concentration: 0.001
#1 2 5. Nearly bare and untilled, and 2.46 16.00 650.00 1.560 0.115
alluvial valley fans
#1 2 Time of Concentration: 0.115
#1 3 3.Short grass pasture 5.32 33.00 620.00 1.840 0.093
#1 3 Time of Concentration: 0.093
#2 1 5. Nearly bare and untilled,and 5.33 32.00 600.00 2.300 0.072
alluvial valley fans
#2 1 Time of Concentration: 0.001
#2 2 4.Cultivated,straight row 5.00 14.00 280.00 1.990 0.039
#2 2 Time of Concentration: 0.039
#2 3 3.Short grass pasture 5.00 20.00 400.00 1.780 0.062
#2 3 Time of Concentration: 0.062
#3 1 3. Short grass pasture 5.67 36.00 635.00 1.900 0.092
#3 1 Time of Concentration: 0.092
#3 2 5. Nearly bare and untilled,and 2.00 12.00 600.00 1.410 0.118
alluvial valley fans
#3 2 Time of Concentration: 0.118
#3 3 2. Minimum tillage cultivation 4.72 30.00 635.00 1.080 0.163
#3 3 Time of Concentration: 0.163
Subwatershed Muskingum Routing 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 2.55 14.00 550.00 1.590 0.096
alluvial valley fans
#1 1 Muskingum K: 0.096
#1 3 5. Nearly bare and untilled,and 32.73 18.00 55.00 5.720 0.002
alluvial valley fans
5. Nearly bare and untilled, and 2.40 12.00 500.00 1.540 0.090
alluvial valley fans
#1 3 Muskingum K: 0.092
#2 1 5. Nearly bare and untilled,and 2.33 14.00 600.00 1.520 0.109
alluvial valley fans
#2 1 Muskingum K: 0.123
#2 3 5. Nearly bare and untilled,and 5.00 14.00 280.00 2.230 0.034
alluvial valley fans
#2 3 Muskingum K: 0.034
#3 1 5. Nearly bare and untilled,and 32.00 16.00 50.00 5.650 0.002
alluvial valley fans
5. Nearly bare and untilled,and 5.88 30.00 510.00 2.420 0.058
alluvial valley fans
#3 1 Muskingum K: 0.060
Filename: KellerMiningKannapolis25yrMod2.sc4 Printed 09-17-2024

SEDCAD 4 for Windows
(,nnurinht 1aaR_7nin Pamnia i _gnNAah
15
Stru SWS Slope Vert. Dist. Horiz. Dist. Velocity Time(hrs)
# # Land Flow Condition (%) (ft) (ft) (fps)
#3 3 5. Nearly bare and untilled,and 32.00 16.00 50.00 5.650 0.002
alluvial valley fans
5. Nearly bare and untilled,and 2.55 13.00 510.00 1.590 0.089
alluvial valley fans
#3 3 Muskingum K: 0.091
4
Filename: KellerMining Kan napolis25yrMod2.sc4 Printed 09-17-2024

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APPENDIX C

SEDCAD 4.0
nnvrinht 9 aaA-,)ni n Pnmoin i Crh%AMh
1
OUTLET PIPE P-1
Plunge Pool Inputs:
Pipe Pipe Outlet Tailwater Channel
Diameter Pipe Slope Elevation Elevation Outlet D50(ft)
(in) M (ft) (ft) Elevation
(ft)
24.00 1.00 767.25 766.75 766.25 0.50
Plunge Pool Results:
Plunge Pool Length: 12.58 ft
Plunge Pool Width: 11.56 ft
Plunge Pool Depth(to top of rock): 2.86 ft
Froude Number: 2.45
Horiz Distance from Pipe Outlet to 2.41 ft
Center of Jet:
Horiz Distance from Pipe Outlet to 5.30 ft
Center of Pool:
Velocity at Pipe Outlet: 7.96 fps
Velocity at Jet Impingement: 12.65 fps
SEDCAD Utility Run Printed 09-16-2024

SEDCAD 4.0
nnvrinhf 1 QQR_)n1 n Pnmoh i Crh%Amh
1
OUTLET PIPE P-2
Plunge Pool Inputs:
Pipe Pipe Outlet Tailwater Channel
Diameter Pipe Slope Elevation Elevation Outlet D50(ft)
(in) M) (ft) (ft) Elevation
(ft)
24.00 1.00 765.00 764.50 764.00 0.50
Plunge Pool Results:
Plunge Pool Length: 17.74 ft
Plunge Pool Width: 16.06 ft
Plunge Pool Depth(to top of rock): 3.92 ft
Froude Number: 2.66
Horiz Distance from Pipe Outlet to 2.89 ft
Center of Jet:
Horiz Distance from Pipe Outlet to 7.64 ft
Center of Pool:
Velocity at Pipe Outlet: 9.55 fps
Velocity at Jet Impingement: 13.70 fps
SEDCAD Utility Run Printed 09-16-2024

SEDCAD 4.0
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1
OUTLET PIPE AT P-3-PLUNGE POOL
Plunge Pool Inputs:
Pipe Pipe Outlet Tailwater Channel
Diameter Pipe Slope Elevation Elevation Outlet D50(ft)
(in) M) (ft) (ft) Elevation
(ft)
24.00 1.50 761.50 760.50 760.00 0.50
Plunge Pool Results:
Plunge Pool Length: 10.34 ft
Plunge Pool Width: 9.80 ft
Plunge Pool Depth(to top of rock): 2.50 ft
Froude Number: 2.39
Horiz Distance from Pipe Outlet to 1.67 ft
Center of Jet:
Horiz Distance from Pipe Outlet to 2.98 ft
Center of Pool:
Velocity at Pipe Outlet: 4.77 fps
Velocity at Jet Impingement: 12.31 fps
SEDCAD Utility Run Printed 09-16-2024

SEDCAD 4.0
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1
Emergency Spillway Channel P-3
Material: Riprap
Trapezoidal Channel
Left Right Freeboard Freeboard Freeboard
Bottom Sideslo e Sideslo e Slope %
Width(ft) p p Depth f %of Depth Mult.x
Ratio Ratio
(VxD)
8.00 3.0:1 3.0:1 33.0 0.50
PADER Method - Steep Slope Design
w/o Freeboard w/Freeboard
Design Discharge: 25.00 cfs
Depth: 0.41 ft 0.91 ft
Top Width: 10.48 ft 13.48 ft
Velocity: 6.56 fps
X-Section Area: 3.81 sq ft
Hydraulic Radius: 0.359 ft
Froude Number: 1.91
Manning's n: 0.0660
Dmin: 3.00 in
D50: 6.00 in
Dmax: 9.00 in
SEDCAD Utility Run Printed 09-16-2024