11_Appendix X - Calculations

Appendix X — Calculations

Culvert Design Calculation
Mining Modification Permit No. 61-16 .rrr
Ivam'. The Quartz Corp. USA ...�
Mitchell County, North Carolina
S&ME Project No. 213314
COMPUTATIONS BY: Signature C Date 07/07/2023
Name C.Ty Brooks, E.I.
Title Staff Professional 11
ASSUMPTIONS Signature l 1 R'AA Date 07/07/2023
AND PROCEDURES Name Cedric H. RuhL P.E.
CHECKED BY: Title Senior Engineer - Proiect Manager
C44. ' / -
COMPUTATIONS Signature Date 07/07/2023
CHECKED BY: Name Andrew E.Wilmer, E.I.
Title Associate Project Manager
REVIEWED BY: Signature Date 07/07/2023
G
Name Christopher J.L. Stahl P.E.
Title Principal Engineer, V.P.
REVIEW NOTES/COMMENTS:
June 9, 2023 1

Culvert Design Calculation
Mining Modification Permit No. 61-16
N%,.. The Quartz Corp. USA
Mitchell County, North Carolina
S&ME Project No. 213314
OBJECTIVE:
The objective of this calculation report is to design a culvert and energy dissipation system at the new entrance
road for the proposed modification to the Quartz Corp. USA Mining Permit No.61-16 for the facility in Mitchell
County, North Carolina.
SUMMARY:
The proposed culvert and dissipator design are in accordance with the design criteria presented in the North
Carolina Department of Environmental Quality(NCDEQ) Erosion and Sediment Control Planning and Design
Manual [Ref. 71.
REFERENCES
North Carolina Erosion and Sediment Control Planning and Design Manual• NCDEQ; May 2013.
NOAA Atlas 74, Volume 2, Version 3, Bonnin, G.M., Martin, D_, Lin, B., Parzybok, T., Yekta, M., & Riley, D.,
April 21, 2017.
NRCS Soil Figures, S&M E Inc.,June 2023.
Compiled HydroCAD Report, Culvert Design, S&ME Inc., June 2023.
Culvert Delineation Figure, S&ME Inc.,July 2023.
DEFINITION OF VARIABLES
A = drainage area (acres) CN = runoff curve number (dimensionless)
Q = flow rate (cfs) P = rainfall depth (in)
S = potential maximum retention after runoff(in) T, = time of concentration (min)
n = Manning's roughness coefficient (dimensionless)
KNOWN AND ASSUMED VARIABLES:
P2 = 3.93 in, P10 = 5.89 in, P2s = 7.14 in, Pioo= 9.27 in. [Ref. 2]
June 9, 2023 2

Culvert Design Calculation
Mining Modification Permit No. 61-16
SOW, The Quartz Corp. USA
Mitchell County, North Carolina I I
S&ME Project No. 213314
CALCULATIONS
S&ME applied the methodologies and approaches described within Section one (1.0) to calculate the peak run-off
flow capacity for the unnamed tributary to Grassy Creek at the proposed culvert location in accordance with the
proposed entrance road.
The culvert design was evaluated to determine culvert dimensions necessary to pass the calculated peak run-off
flow capacity for the design storm event. In parallel with the culvert design, a riprap energy dissipater was
designed to handle the peak outflows from the culvert. The riprap energy dissipator design included the
determination of the dissipater footprint and necessary riprap size/class.
1.0 Culvert Design
The proposed culvert has a maximum drainage area of 59.8 acres. The proposed culvert will be constructed in an
unnamed tributary to Grassy Creek. The approximate location of where the culvert is to be constructed is
approximately 550 linear feet upstream of the confluence with Grassy Creek.
1.1 Culvert Hydrology
The HydroCAD@ stormwater modeling software was utilized to calculate the runoff volume for the design storm
in the unnamed tributary at the location of the proposed culvert. S&ME utilized HydroCADS to apply the SCS
Curve Number Method, specifically the SCS TR-20 event simulation model for the representative drainage area_
The curve number (CN) is an empirical parameter developed by the Natural Resources Conservation Service
(NRCS) from hydrology evaluations, soil type, and surface conditions to predict direct runoff volume from a rainfall
event. NRCS Technical Release 55 (TR-55) Table 2-2 [Ref. 3] was used to select the CN value for each cover type,
or surface condition, for the representative drainage area. Due to the variable Hydrologic Soil Groups (HSG)
referenced in the NRCS Web Soil Survey [Ref. 3], S&ME applied HSG "B" as a constant on-site soil type for the
representative drainage area. HSG "B"was the most prevalent Hydrologic Soil Group for the site.
The time of concentration is the time for flow from the most hydrologically remote point in the contributing
drainage area to leave the watershed.The minimum allowable time of concentration for use in TR-55 is 0.1 hours,
or 6 minutes. A time of concentration was manually computed for the representative watershed.
Since the project site is located in Mitchell County, a non-coastal county, a SCS Type-II rainfall distribution will be
utilized.The duration of these storms will be 24-hours. Rainfall data was obtained from NOAA Precipitation
Frequency Estimates [Ref.2].
Woods/grass was selected as the land use for the representative area. Table 1, shown below, highlights the CN for
the selected land use [Ref. 1] considering the soil conditions [Ref. 3].The 100-yr. storm event was utilized to
evaluate site conditions.
`r..r
June 9, 2023 3

Culvert Design Calculation
Mining Modification Permit No. 61-16 s
The Quartz Corp. USA
Mitchell County, !North Carolina � !
S&ME Project No. 213314
Table 1: Hydrologic Conditions-Culvert
24-Hour Rainfall Time of
Curve Drainage Peak Flow
Storm Depth
Number Area Concentration
Tributary Area Land Use Description Recurrence {P)
Interval {inches) {CN} {A} {T�} (cfsfs)
[Ref.1] (ac) (min) [Ref.1]
{years} I [Ref.2)
Woods/Grass I 100-Year 1 9.27 71 1 59.8 1 36.9 257.29
The culvert will be designed to pass the peak flow of a 100-yr. storm event (257.29 cfs).
1.2 Culvert Capacity
The culvert design was evaluated, in the sections below, to determine culvert dimensions, the dimensions are
presented in Table 2.
The culvert capacity was evaluated using HydroCAD [Ref. 41. The dimensions of the culvert design were
determined based on the culvert capacity to pass the 100-yr, design storm.
�. The culverts failure mode of concern is road overtopping. The culvert design was evaluated with a minimum cover
depth of 2-ft., as listed in Table 2. Any culvert with a cover depth less than 2-ft. has an increased risk of failure due
to overtopping.
The Manning's roughness, "n" for the culvert design is shown in Table 2.
Table 2: Culvert Characteristics
Quantity
Diameter Length Manning's n Upstream Downstream Flow Area Longitudinal
Culvert Type (Q) {D} (L) Pipe {n) invert Invert (A) Slope
[Ref.4] (in) (ft) Material [Ref.1] (IU) (ID) (ft) {s)
[Ref.4] [Ref.4] (ft) (ft) (ft/ft)
Circular 2.0 48.0 170.0 RCP 0.012 2610 2598 25.13 0.071
The dimensions of the culvert design (Table 2) indicate that the proposed culvert size has sufficient capacity to
handle the peak flow (Table 3) for the hydraulic conditions found on site.
Table 3: Culvert Design Results
Culvert Road Water
Upstream Elevation Surface Freeboard Outflow
Invert {RE) Elevation {F} {Q)
{lU} {WSE} (ft) (cfs)
(ft) (ft} ft
2610.0 1 2636.0 1 2616.2 19.8 248.23
2.0 Riprap Energy Dissipater Design
In parallel with the culvert design a riprap energy dissipater was designed to prevent the outflow from the culvert
from scouring the existing stream channel bed. The NCDEQ Riprap Energy Dissipater Nomograph Figure 8.06a
June 9, 2023 4

Culvert Design Calculation
Mining Modification Permit No. 61-16
The Quartz Corp. USA
Mitchell County, North Carolina
S&ME Project No. 213314
[Ref 1.] was utilized to determine the d50 Riprap size and the apron footprint.The figure is for the"Design of
outlet protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter)." Utilizing the
culvert discharge for the design storm event the parameters for the riprap energy dissipater were determined and
are shown in Table 4.
Table 4: Riprap Energy Dissipater Design Parameters
Minimum Minimum
Culvert Culvert
Riprap d50 Apron Apron
Diameter Capacity
{q} {D} Length Width
{D}
(DI (cfs) {in} {La} {La}
(Ref.S] {Ref.S] {Ref.6] (ft) {ft}
{Ref.6] [Ref.6)
48 124.12 10.0 28.0 32.0
CONCLUSIONS
A culvert design over the unnamed tributary to Grassy Creek was evaluated to be used within the design for the
proposed modification to the Quartz Corp. USA Mining Permit No_ 61-16.The proposed culvert and dissipater
design are in accordance with the design criteria presented in the North Carolina Department of Environmental
Quality(NCDEQ) Erosion and Sediment Control Planning and Design Manual [Ref. 1).
t.r
June 9, 2023 5

References

Reference 1
North Carolina Erosion and Sediment Control Planning and Design Manual;NCDEQ;May2013.
��rr�

Appendices
Table 8.03e Runoff curve numbers of urban areas'
Curve number for
---_—------M-----_------_---Cover Description--------------------- ---_----hydrologic soil group---
Cover type and hydrologic condition Average percent A B C D
impervious area
Fully developed urban areas(vegetation established)
Open space (lawns, parks,golf courses, cemeteries, etc.)3:
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:
1/8 acre or less(town houses) ......................................... 65 77 85 90 92
1/4 acre ............................................................................ 38 61 75 83 87
1/3 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 77 86 91 94
(pervious areas only, no vegetation)^ ............
..................
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 8.03.17

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Reference 2
NOAA Atlas 14, Volume 2, Version 3,Bonnin,G.M., Martin, D., Lin, B., Parzybok,T.,Yekta, M., & Riley, D.,April 21,
2017.
`ire

212123.3:44 PM Precipitation Frequency Data Server
NOAA Atlas 14,Volume 2,Version 3
Location name:Spruce Pine, North Carolina, USA" i"'
Latitude: 35.902°, Longitude:-82.064' '
Elevation:2595.26 ft"
source:ESRI Maps y
source:USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M.Bonnin.D.Martin,B.Lin,T.Parrybok,M.Yekta,and D.Riley
NOAA,National Weather Service,Silver Spnng,Maryland
PF tabular I F-E_gmRW2Ll I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)l
Average recurrence interval (years)
Duration 5 10 25 5fl 1 6-5 -1 1650
5-min 0.372 0.443 0.526 0.591 0.675 0.740 D.805 0.872 0.960 1.03
(0.339-0,410) (0.405-0.488) (0.478-0.579) (0.536-0.648) (0.608-0.743) (0.662A.815) (0.716-0.889)1(0.767-0.967 (0.833-1.07) (0.883-1.16)
1fl-min 0,541 0655 0.648-0..780 0.76fi 0927 0.856 1404 0.970 18.18 1.06 1930 1.4-21.41 1.2-31853 1.325269 1.39-61?83
15-min 0.677A 818 D:0
14 0 981 D.969 1.17 1.082.31 1,233�50 (1.34 19-71 62 4 64 (1.44-179 1.54 1,93 1.6G 2.13 1.75023
E
-min 1.02 1.23 i.52 1.73 2.02 2.25 F 2.4s72.72 3.04 3.30
(0.928-1.12)11 (1.13-1.36) 1 (1.38-1.67) 1 (1.57.1.90) 1 (1,82-2.22) (2.01-2.48) 1 (2.20-2.74) (2.39-3.O1J (2.64-3.39) (2.83-3.71
6fl-min 1.16??40 1.41--11 YO 1.779414 2.04 2.48 2.42 2996 (2.73 3,35 (3.3 3.77 3.35-4 22 3.9-4.87 4.3g5.41
2-hr 1.33 1661 (1.63 1997 (2.07 2850 2.42 2?94 (2.2-3 57 3.32-4.10 3.5-4 68 4,218,32 (4.846.27)1 (5.37 7109
3 hr 1.59 1.93 -2.-44-7F 2.87 3.56 4.D4 4.63 5.29 6.26 7.10
1.44-1.75) 1 (1,75-2.13) 1 (2.22-2.69) 1 (2.59.3.16) 1 (3.143.86) 1 (3.59-4.47) 1 (4.07-5.13) 1 (4.60-5.88) 1(5.34.7.01) (5.98.8.01
6-hr 1.8602.22 22 5-2.68 2.83 33 2 3 3-3.88 3.9-4,72 (44595.44) (5.04-6 26 5.69 7A8 6.2-8.60 7.41 97
84
2.61 3.15 3.90 4.51 5.37 6.09 fi.85 7.68 8.88 9.90
12-hr 241-2.83) (2.91-3.43) (3.59-424) 1 (4.14.4.90) (4,915.86) (5.526.66) (6.17-7.52) 1 (6.85-8.47) (7.82-9.87) (8.62-11.1)
24-hr 3.24 3.93 5.01 5.89 7.14 8.17 9.27 10.5 12.2 13.6
(2.93-3.66) 1 (3.55-4A5) (4.52-5.68) 1 (5-29.6.68) (6.37-8.12) (7.23.9.32) (8.13-10.6) (9.08-12.0) 1(10.4-14,1) 1(11.4-15.9)
2-day 3.54-4.32 4.9 512 5.41-663 6.0-97877 7,54 9.40 8.55-61o.8 9.60-2.3 1017-14.0 12.2-6A 13.1
5 8.5
3 day 4.17 ) 5.03 6.31 7.35 8.82 10.0 11.3 12.7 14.7 16.3
(3.79-4.62 (4.58-5.58) 5.73-7.02) 6.65.818) 1 (7.91-9.84) 1 (8.9311.2} 1 (9.98-12.7 (1L1-14.4 (12.6.16.7) 1(13.8.18.8)
4.44 5.34 6.67 7.73 9.22 10.4 11.7 13.1 75.0 16.6
4day (4.05-4.92) (4.87-5.93) (6.06-7.41) 1 (7.00-8.59) 1 (8.29-10.3) 1 (9.30-11.7) L(10.4-13.2) (12.9-17.1) (14.2-192)]
12.8
5.16 6.19
6.0
7-day 4.1-5.78 5,64 6.94 6.90-8.53 7.89 9080 9.23-i21.6 10.3-3.0 (11.3-14.6 (12.448.2 13.9-8.5 15.1
0-0.5
10-day 5.91 7.05 8.50 9.63 11.2 12.4 13.6 14.8 16.5 18.0
(5,426.57) (6.46-7.85 (7.77-9.48 (8.79-10.8) (10.1-12.5 (11.1-13.9) (12.1-15.3) {13.2-16.8) (14.5-18.9)
2fl-day (7.3 8.62J (8.67--310.2) (10.13-2.1) (11,5-13.7) (13.2-5.8) (14A-187.4) (15.17-9.2) (16.9-20.9 (18.6-3.4J (19.9?4 5.4
3fl-day 9.8-0,5 10.7-2.4 12 53 4.5 13.8-16.2 15,5-18.3 16.8 0.0 18 1-2.7 19 31 3.4 20.9-25.7 22 1427.5
-day 12.3 14.4 16.5 18.1 20.2 -21-8-71 23.4 25.0 27.1 28.6
(11.5-131) (13.5-15.4) 15.5-17.6} 11 (16.9-193) 1 (18.9-21.6) 1 (20,3-23.4) 11 (21.7-25.2) 1 (23.0-27.0) (24.7-29.4) (26.0-31.3)
6fl day 14.6 17_i 19.4 21.2 23.5 25.2 26.9 28.5 30.6 32.1
13.8-15.6) (16.1-18.2J (18.3-20.7) (19.9-22.6) (2.0.25.1) (23.6-27.0) (25.0-28.8) (26.430.7) (28.2-33.1) (29.5-34.9)
t Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates
(for 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
are not checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
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PF graphical

212/23,3:44 PM Precipitation Frequency Data Server
PDS-based depth-duration-frequency (DDF) curves
Latitude: 35.90201, Longitude: -82.06400
�. 35
Awrage recurrence
30 ... Inlerval
(years)
5 25 ... ... ._. .. — 1
a 2
v 20 _.. ... ... — 5
O
c 15 ... ... ... ... ... — 25
50
mU 100
10 ....
n- -- 200
— Soo
5 _ - ...
1000
C C C C C � � � L �. T 7•+7-. 7•+ 7+ ?� ?i T?,
E E E 4 �, JF v a '0 ro 'a V -a -0 'a-0
L� O A r0 0 � N N r11 Q P O O m �1b
Duration
35
30 ............... ..... .....
Duration
CL
20 ..... ... _
5-min 2-day
— to-min — 3-day
0 15-min — 4-day
15 30-min — 7-day
u — 60-mm totlay
10 — 2-hr — 20-day
— 3-hr — 30 day
5 ... ._....- — 6-hr — 45-clay
12-hr — 60-day
0 --- - 24-4ir
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14,Volume 2,Version 3 Created(GMT):Thu Feb 2 20:43:37 2023
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Maps & aerials
Small scale terrain
fir'

2/2123,3:44 PM Precipitation Frequency Data Server
AVERY CDJ
udR�tsr�a�
FLO
Penland
'Spruce Pine
,Grassy Creek
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,*mow

Reference 3
NRCS Soil Figures,S&ME, Inc.,June 2023.

A 11 •m:1, • . ..IW 11 •ItCll •1[./� •It./l •IG:11
Az
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ir
9@10 map may R(M tbo wav tLG tdhB�3�n ., ils• "' �a sa'"J c �
A 11 -15:If •1.�1• •/[I11 •IG 11 •IV.1• •1[[11 •It:/•

Hydrologic Soil Group—Mitchell County,North Carolina
(Bottomless Culvert DA)
MAP LEGEND MAP INFORMATION
Area of Interest(A01) E3 C The soil surveys that comprise your AOI were mapped at
. .. Area of Interest(A01) 0 CID 1:12,000.
Soils S D Warning:Soil Map may not be valid at this scale.
Soil Rating Polygons
A 0 Not rated or not available Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
AID Water Features line placement.The maps do not show the small areas of
0 B Streams and Canals contrasting soils that could have been shown at a more detailed
Transportation scale.
0 BID
4-4+ Rails Please rely on the bar scale on each map sheet for map
0 C � Interstate Highways measurements.
0 CID US Routes Source of Map: Natural Resources Conservation Service
EJ D Web Soil Survey URL:
Major Roads Coordinate System: Web Mercator(E PSG:3857)
Not rated or not available Local Roads
Maps from the Web Soil Survey are based on the Web Mercator
Soil Rating Lines Background projection,which preserves direction and shape but distorts
~ q distance and area.A projection that preserves area,such as the
Aerial Photography Albers equal-area conic projection,should be used if more
~ AID accurate calculations of distance or area are required.
+� B This product is generated from the USDA-NRCS certified data as
ry BID
of the version date(s)listed below.
�.+ C Soil Survey Area: Mitchell County, North Carolina
Survey Area Data: Version 17,Sep 12,2022
CID
Soil map units are labeled(as space allows)for map scales
r.+ D 1:50,000 or larger,
. . Not rated or not available Date(s)aerial images were photographed: Apr 1,2022—May 9,
Soil Rating Points 2022
0 A The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
® A!D imagery displayed on these maps,As a result,some minor
B shifting of map unit boundaries may be evident.
® BID
USDA Natural Resources Web Soil Survey 6/5/2023

Hydrologic Soil Group—Mitchell County,North Carolina Bottomless Culvert DA
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
CaE Cashiers sandy loam, A 2.2 3.6%
30 to 50 percent
slopes,stony
HnD Huntdale silty clay loam, B 0.2 0.3%
15 to 30 percent
slopes,stony
SdD Saunook-Thunder B 7.7 12.9%
complex, 15 to 30
percent slopes,stony
Ud Udorthents,loamy C 13.1 21.9%
WgC Watauga sandy loam,8 B 20.2 33.7%
to 15 percent slopes,
stony
WgD Watauga sandy loam, B 16.5 27.6%
15 to 30 percent
slopes,stony
l Totals for Area of Interest 59.9 100.0%
USDA Natural Resources Web Soil Survey 6/5/2023
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group—Mitchell County, North Carolina Bottomless Culvert DA
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 sails 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
USDA Natural Resources web Soil Survey 6/5/2023
r Conservation Service National Cooperative Soil Survey Page 4 of 4

err✓
Reference 4
Compiled HydroCAD Report,Culvert Design, SWE Inc.,June 2023.

50S
Conv . Culv . Entrance
";�7
Aip
CUIV
Subcat Reach on Link Routing Diagram for 213314_Culvert_HydroCAD
Prepared by S&ME, Inc., Printed 6/29/2023
HydroCADQ 10,00-26 sln 06707 ©2020 HydroCAD Software Solutions LLC

213314_Culvert_Hyd roCAD
Prepared by S&ME, Inc. Printed 6/29/2023
HydroCAD®10.00-26 s/n 06707 ©2020 HydroCAD Software Solutions LLC Page 2
Project Notes
Defined 10 rainfall events from 213314_Quartz Corp PF_Depth OF

213314_Culvert_HydroCAD
Prepared by S&ME, Inc. Printed 6/29/2023
`.r.� HydroCAD®10.00-26 s/n 06707 ©2020 HydroCAD Software Solutions LLC Pam
Area Listing (selected nodes)
Area CN Description
(acres) (subcatchment-numbers)
19.034 70 1/2 acre lots, 25% imp, HSG B (5S)
8.778 98 Paved parking, HSG B (5S)
32.031 65 Woods/grass comb., Fair, HSG B (5S)
59.843 71 TOTAL AREA

213314_Culvert_Hyd roCAD
Prepared by S&ME, Inc. Printed 6/29/2023
�..�✓ HydroCAD® 10.00-26 s/n 06707 U 2020 HydroCAD Software Solutions LLC Page 4
Soil Listing (selected nodes)
Area Soil Subcatchment
(acres) Group Numbers
0.000 HSG A
59.843 HSG B 5S
0.000 HSG C
0.000 HSG D
0.000 Other
59.843 TOTAL AREA

213314_Culvert_Hyd roCAD
Prepared by S&ME, Inc. Printed 6/29/2023
�..� HydroCAD® 10.00-26 s/n 06707 ©2020 HydroGAD Software Solutions LLC Paae 5
Ground Covers (selected nodes)
HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment
(acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers
0.000 19.034 0.000 0.000 0.000 19.034 1/2 acre lots, 25% imp 5S
0.000 8.778 0.000 0.000 0.000 8.778 Paved parking 5S
0.000 32.031 0.000 0.000 0.000 32.031 Woods/grass comb., Fair 5S
0.000 59.843 0.000 0.000 0.000 59.843 TOTAL AREA

213314_Culvert_Hyd ro CAD
Prepared by S&ME, Inc. Printed 6/29/2023
HydroCADO 10.00-26 s/n 06707 ©2020 HydroCAD Software Solutions LLC Page 6
Pipe Listing (selected nodes)
Line# Node In-Invert Out-Invert Length Slope n DiamMidth Height Inside-Fill
Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches)
1 1 P 2,610.00 2,598.00 170.0 0.0706 0.011 48.0 0.0 0.0

213314_Culvert_HydroCAD Type 11 24-hr 100-yr Rainfall=9.27"
Prepared by S&ME, Inc. Printed 6/29/2023
HydroCAD® 10.00-26 s/n 06707 ©2020 HydroCAD Software Solutions LLC Page 7
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 5S: Conv. Culy. Entrance Runoff Area=2,606,748 sf 22.62% Impervious Runoff Depth>5.24"
Flow Length=3,140' Tc=36.9 min CN=71 Runoff=257.29 cfs 26.138 of
Pond 1P: Culv Peak Elev=2,616.22' Storage=27,877 cf Inflow=257.29 cfs 26.138 of
48.0" Round Culvert x 2.00 n=0.011 L=170.0' S=0.0706 'P Outflow=248.63 cfs 26.119 of
Total Runoff Area=59.843 ac Runoff Volume=26.138 of Average Runoff Depth =5.24"
77.38%Pervious =46.306 ac 22.62%Impervious= 13.536 ac

213314 Culvert_HydroCAD Type 1124-hr 100-yr Rainfall=9.27"
Prepared by S&ME, Inc. Printed 6/29/2023
`..r� HydroCAD® 10.00-26 s/n 06707 ©2020 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment SS: Conv. Culv. Entrance
Runoff = 257.29 cfs @ 12.33 hrs, Volume= 26.138 af, Depth> 5.24"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100-yr Rainfall=9.27"
Area (sf) CN Description
1,395,267 65 Woods/grass comb., Fair, HSG B
382,358 98 Paved parking, HSG B
829,123 70 1/2 acre lots, 25% imp, HSG B
2,606,748 71 Weighted Average
2,017,109 77.38% Pervious Area
589,639 22.62% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
13.1 100 0.2297 0.13 Sheet Flow,
Woods: Dense underbrush n= 0.800 P2= 3.70"
14.0 1,001 0.2276 1.19 Shallow Concentrated Flow,
Forest w/Heavy Litter Kv=2.5 fps
8.8 1,077 0.0855 2.05 Shallow Concentrated Flow,
`..✓ Short Grass Pasture Kv=7.0 fps
1.0 962 0.0891 16.10 563.63 Channel Flow,
Area= 35.0 sf Perim= 20.0' r= 1.75'
n= 0.040 Mountain streams
36.9 3,140 Total

213314_Culvert_HydroCAD Type it 24-hr 100-yr Rainfall=9.27"
Prepared by S&ME, Inc. Printed 6/29/2023
`..► HydroCADO 10.00-26 sln 06707 ©2020 HydroCAD Software Solutions LLC Paces
Subcatchment 5S: Conv. Culy. Entrance
Hydrograph
280 p Runaff
260 257.29 cts
240 Type II 24-hr
220- 100-yr Rainfall=9.27"
200- Runoff Area=2,606,748 sf
180. Runoff Volume=26.138 of
160 Runoff Depth>5.24"
0 140 Flow Length=3,140r
U. 120-
Tc=36.9 min
100-
80 CN=71
60
40-
20
5 6 7 S 9 10 11 12 13 14 15 16 17 18 19 20
Time (hours)
,%N.W
N4r,

213314_Culvert_HydroCAD Type 11 24-hr 100-yr Rainfall=9.27"
Prepared by S&ME, Inc. Printed 6/29/2023
HydroCAD® 10.00-26 s/n 06707 ©2020 HydroCAD Software Solutions LLC Paoe 10
Summary for Pond 1 P: Culy
Inflow Area = 59.843 ac, 22.62% Impervious, Inflow Depth > 5.24" for 100-yr event
Inflow = 257.29 cfs @ 12.33 hrs, Volume= 26.138 of
Outflow = 248.63 cfs @ 12.39 hrs, Volume= 26.119 af, Atten= 3%, Lag=4.0 min
Primary = 248.63 cfs @ 12.39 hrs, Volume= 26.119 of
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev=2,616.22' @ 12.39 hrs Surf.Area= 9,003 sf Storage=27,877 cf
Plug-Flow detention time= 1.4 min calculated for 26.119 of (100% of inflow)
Center-of-Mass det. time= 1.1 min ( 800.2- 799.1 )
Volume Invert Avail.Storage Storage Description
#1 2,610.00' 110,509 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
2,610.00 998 0 0
2,612.00 2,711 3,709 3,709
2,614.00 5,446 8,157 11,866
2,616.00 8,616 14,062 25,928
2,618.00 12,113 20,729 46,657
�..✓ 2,620.00 15,889 28,002 74,659
2,622.00 19,961 35,850 110,509
Device Routing Invert Outlet Devices
#1 Primary 2,610.00' 48.0" Round Culvert X 2.00
L= 170.0' RCP, square edge headwall, Ke= 0.500
Inlet/Outlet Invert= 2,610.00'/2,598.00' S= 0.0706 'r Cc= 0.900
n= 0.011 Concrete pipe, straight&clean, Flow Area= 12.57 sf
Primary OutFlow Max=248.23 cfs @ 12.39 hrs HW=2,616.21' (Free Discharge)
L1=Culvert (Inlet Controls 248.23 cfs @ 9.88 fps)

213314_Culvert_HydroCAD Type 1124-hr 100-yr Rainfall=9.27"
Prepared by S&ME, Inc. Printed 6/29/2023
�..� HydroCAD® 10.00-26 sln 06707 ©2020 HydroCAD Software Solutions LLC Page 11
Pond 1 P: Culv
Hydrograph
❑ Inflow
280_ F25729d5 I Primary
260- 2aes3�is Inflow Area=59.843 ac
240-. Peak Elev=2,616.22'
20
200
Storage=27,877 cf
1801i 48.0"
160 Round Culvert x 2.00
c 14°-
120:_ n=0.011
100 L=170.0'
80 S=0.0706 T
60=
4°:
20-
5 6 7 8 9 10 11 12 13 14 15 417 18 19 20
Time (hours)

Reference 5
Culvert Delineation Figure,SWE Inc.,July 2023.
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ti CULVERT LOCATION
2774__y172 N �,71a DATE:
o 1153 6s� 2j e -110- SHEET FLOW
7J7/2023
2352
T ►--- SHALLOW CONCENTRATED FLOW PROJECT NUMBER
tk 6f Gf
2743 CHANNELIZED FLOW 213314
FIGURE NO.
a REFERENCE- CULVERT DRAINAGE AREA
GIS BASE LAYERS WERE OBTAINED FROM ESRI. THIS MAP IS FOR INFORMATIONAL 4j 1- LO
N �s
rj PURPOSES ONLY. ALL FEATURE LOCATIONS DISPLAYED ARE APPROXIMATED.THEY ARE 0 300 600 266.3 ,t61 MAJOR INTERVALS - (10-)
NOT BASED ON CIVIL SURVEY INFORMATION,UNLESS STATED OTHERWISE. (FEET) 2650
11-53 2656 MINOR INTERVALS - (2')
s

Temporary Holding Basin Volume Calculation
Mining Modification Permit No. 61-16
Nw"w The Quartz Corp. USA I
Mitchell County, North Carolina
S&ME Project No. 213314
COMPUTATIONS BY: Signature �J . 1�� �h' �� Date 07/07/2023
Name Cedric H. Ruhl P.E.
Title Senior Engineer—Project Manacter
ASSUMPTIONS Signature Date 07/07[2023
AND PROCEDURES Name Ty Holderbaum, P.E.
CHECKED BY: Title Project Manager
COMPUTATIONS Signature Date 07/07/2023
CHECKED BY: Name Andrew E.Wilmer. E.I.
Title Associate Project Manager
Al
REVIEWED BY: Signature 1 Date 07/07/2023
Name Christopher J.L. Stahl, P.E.
Title Principal Engineer, .P_._
REVIEW NOTES/COMMENTS:
July 7, 2023 1

Temporary Holding Basin Volume Calculation
Mining Modification Permit No. 61-16
\%EW The Quartz Corp. USA 117
Mitchell County, North Carolina 7
S&ME Project No. 213314
OBJECTIVE:
The objective of this calculation report is to evaluate the proposed temporary holding basin volume, and flow
rates into and out of the temporary holding basin.
SUMMARY:
The storage capacity of the proposed temporary holding basin was evaluated for a range of inflow and outflow
pumping scenarios.
CALCULATIONS
The plant periodically needs to shut down the wastewater treatment system for maintenance. The temporary
holding basin will be a double-lined facility that will temporarily store wastewater, allowing the plant to maintain
operations during wastewater treatment system maintenance.The liquids in the temporary holding basin will be
pumped to the existing wastewater treatment system when the system becomes operational after completion of
maintenance activities.
The temporary holding basin has an operating volume of 715,000 gallons not including freeboard. Several
pumping scenarios were evaluated on a flow rate basis as summarized in the following table:
Table 1: Tempo rV Holding Basin um pi Analysis
Temporary Holding
Initial
Condition Basin Operating Temporary Inflow Outflow Net Flow Filling Time Dewatering
Description Holding Basin Time
No. Volume {gpm} (gpm) (gpm} (hours)
{gallons} Storage Volume {hours}
(gallons)
Inflow=100gpm
1A Outflow=0gpm 715,000 ❑ 100 ❑ 100 119.2 N/A
Basin is empty
I of I ow=1,000 gpm
113 Outflow=0gpm 715,000 0 1,000 0 1,000 11.9 N/A
Basin is empty
Inflow=2,500 gpm
1C 0utf10w=0gpm 715,000 0 2,500 0 2,500 4.8 N/A
Basin is empty
Inflow=C gpm
2A Outflow=50gpm 715,000 715,000 0 50 -50 N/A 238
Basin is full
Inflow=0gpm
2B Outflow=100gpm 715,000 715,000 0 100 -100 N/A 119
Basin is full
Inflow=0 gpm
2C 0utfl0w=1,000gpm 715,000 715,000 0 1000 -1,00❑ N/A 12
Basin is full
July 7, 2023 2

Temporary Holding Basin Volume Calculation
Mining Modification Permit No. 61-16 s
The Quartz Corp. USA
Mitchell County, North Carolina
S&ME Project No. 213314
CONCLUSIONS
The storage capacity of the proposed temporary holding basin was evaluated for a range of inflow and outflow
pumping scenarios.
July 7, 2023 3

�.d
Appendix XI — NPDES Wastewater Permit Submittals

`;mod
Renewal Application (July 10, 2015)

THE QUARTZ"
� - CORP
July 10, 2015
Mrs. Diana Sprinkle
NCDENR/DWQ/Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
Via FedEx
RE: The Quartz Corp USA
Renewal Application: NPDES Permit NCO000353
Dear Mrs. Sprinkle,
The Quartz Corp USA (Quartz) hereby respectfully requests renewal of our NPDFS Permit No.
NC0000353 for our "TFC Plant" located at 787 Altapass Road, PO Box 309, Spruce Pine, NC
28777.
The only change since issuance of the last permit is that Plant 2 has been dismantled and
replaced with Plant 4 with similar operating parameters.
Enclosed you will find three (3) signed copies of the NPDES renewal application which includes:
• The EPA Form 2C Renewal Forms;
• Wastewater Treatment Flow;
• A narrative description of the sludge- management plan; and
• Laboratory Sample Results
Should you have any questions, please contact me at 828-765-8977 or at
[e-mail]
Sincerely,
6e�rry Prosser
Plant Manager

Renewal Application (May 4, 2018)

M
® O
• ® ® ®, I
®0 • ENVIRONMENTAL
May 04,2018 •
Mr.David Hill
NC Department of Environmental Quality
Division of Water Resources/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: NPDES Renewal Application
The quartz Corp USA
78 Ai'tapass Road
Spruce Pine,Mitchell County,North Carolina
Permit No.NC00D03S3
Dear Mr.Hill:
This letter and supporting documents represent a permit renewal application prepared by AERIS
Environmental,Inc.for The Quartz Corp USA located at 787 Altapass Road In Spruce Pine,North Carolina.
An initial renewal application was submitted to your office on July 10, 2015.This submittal is provided in
response to your email request to Teresa Morris dated February 15,2018.
Should you have any questions or require additional information, please contact me by telephone at
704.367.1971 or by email at [e-mail]. The facility contact is Ms.Teresa Morris by telephone
at 828.765.9621,ext.7030 or by email at [e-mail].
Sincerely,
LI'Lu S Loru=-
Kevin S.Woods,PE
Enclosures:Short Form C,Site Map
1440 Blueberry Lane•Charlotte,North Carolina 28226
704.367.1971(phone/fax)
www.aerisenviro.com

NPDES PERMIT APPLICATION -- SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number INCO000353 —�
Please print or type.
1. Contact Information:
Owner Name The Quartz Corp USA
Facility Name The Quartz Corp USA
Mailing Address P.O. Box 309
City Spruce Pine
State / Zip Code NC 28777
Telephone Number 828.765,5500
Fax Number 828.766.2110
e-mail Address [e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road 797 Altapass Highway
City Spruce Pine
State / Zip Code NC 28777
County Mitchell
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name The Quartz Corp USA
Mailing Address P.O. Box 309
City Spruce Pine
State / Zip Code NC 28777
Telephone Number 828.765.5500
Fax Number 828.766.2110
4. Ownership Status:
Federal ❑ State ❑ Private X Public ❑
Page 1 of 5 C-MI Ion

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
S. Standard Industrial Classification (SIC)code(s): 1499-Miscellaneous Nonmetallic Minerals
Except Fuels
6: Number of employees: 46
7. Describe the treatment system List all installed waste treatment components with capacities,
describe the processes that generate wastewaters. If the space provided is not sufficient attach a
separate sheet of paper with the system description.
Wastewater streams from processing ore are separated into fluoride and non-fluoride streams.
The streams are equalized and neutralized before the addition of polymers and transfer to
clarifiers. Underflows are pumped to vacuum filters for moisture removal. Resultant tailings
are used as fill or landfilled. Clarifier effluent is recycled or discharged.
3.5 MGD wastewater treatment facility consists of the following:
-Three clarifiers;
- Polymer feed system;
- Lime feed system for pH adjustment;
-Vacuum filters;
-Emico clarifier/thickener;
- Pump station emergency generator;
- Flow measuring and totalizing equipment; and
-Two recycle pumps.
S. Is facility covered under federal effluent limitation guidelines? No ® Yes ❑
If yes, specify the category?
9. Principal product(s)produced: High Purity Quartz
Principal raw material(s) consumed: Quartz Ore
Briefly describe the manufacturing process(es):
Mined quartz ore is sized and washed. A flotation process using dilute hydrofluoric acid separates
high purity quartz which is drained, dried and further processed for customer shipments.
10. Amount of principal product produced, or raw material consumed
Listspecific amounts consumed and/or units of roduction over the last three ears
Product Produced or Raw Material Product Produced or Raw Material
Consumed Consumed
AVERAGE (PEAK)
per Day 877 tons/day raw material (2015-17) 1,136 tons/day raw material (2016)
per Month 26,303 tons/mo raw material (2015-17) 134,084 tons/mo raw material (2016)
per Year 1316,485 tons/yr raw material (2015-17) 1411,543 tans/yr raw material (2016)
Page 2 of 5 C-MI 10108

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
11. Frequency of discharge: Continuous ® Intermittent ❑
If intermittent:
Days per week discharge occurs: Duration:
12. Types of wastewater discharged to surface waters only
Discharge Flow
GALLONS PER DA
Sanitary -monthly average 0 gpd
Utility water, etc. - monthly average 0 gpd
Process water- monthly average 3,000,000 gpd
Stormwater-monthly average 0 gpd (retention basins limit stormwater discharge to
negligible flow)
Other-monthly average
Explain: 0 gpd
Monthly Average 3,000,000 gpd
total discharge (all types)
13. Number of separate discharge points: Four
Outfall Identification number(s): _001 (stormwater). 002 (stormwater) 003 Istormwaterl 004
(effluent)
14. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
North Toe River. Mats is attached
`�rrf
Page 3 of 5 C-M 110108

NPDES PERMIT APPLICATION - SHORT FORM C -Minor Industrial
Minor industrial,manufacturing and commercial facilities.
/ 15. Effluent Data [for now or proposed discharges]
Provide data for the parameters listed. Temperature and pH shall be grab samples,for all other parameters 24-hour
composite sampling shall be used.If more than one analysis is reported, report daily maximum and monthly average.
If only one analysis is reported, 'report as daily maximum.
NOTE.Permittees requesting renewal should complete the table ONLYfor the parameters
currently monitored. Summarize the past 3 years of effluent data.
Parameter Day Monthly Units of
Maximum Average Measurement
Biochemical Oxygen Demand (BOD5)
Chemical Oxygen Demand (COD)
Total Organic Carbon
Total Suspended Solids 2370 915 lb/day
Ammonia as N
Temperature (Summer)
Temperature (Winter)
PH 7.80 6.89
Fecal Coliform (If sanitary waste is
present)
Total Residual Chlorine (if chlorine is
used)
�.d
16. List all permits, construction approvals and/or applications (check all that apply and provide
permit numbers or check none if not applicable):
Type , Permit Number Type Permit Number
Hazardous Waste (RCRA) NCR000144774 NESHAPS (CAA) None
UIC (SDWA) None Ocean Dumping (MPRSA) None
NPDES NC0000353 Dredge or fill (Section 404 or CWA) None
PSD (CAA) None Other None
Non-attainment program (CAA) None
27. List any chemicals that may be discharged (Please list and explain source and potential
amounts.)
The following chemical substances were identified in test results of effluent dated June 2015.
The source(s) of the substances is not known, though they may have been present in the raw
water obtained from Grassy Creek for use in processing:
Fluoride (16984-48-8) from the flotation process, up to 8.90 mg/L
Nitrate-Nitrite, as N, up to 0.39 mg/L
Nitrogen, Total Organic (as N), up to 0.97 mg/L
Phosphorous, as P,up to 0.05 mg/L
Page 4 of 5 C*10/08

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
Aluminum (7429-90-5), up to 0.41 mg/L
Barium (7440-39-3), up to 0.025 mg/L
Iron (7439-89-6), up to 0.93 mg/L
Magnesium (7439-95-4), up to 2.5 mg/L
Molybdenum (7439-98-7), up to 0.218 mg/L
Manganese (7439-96-5), up to 0.01 mg/L
Nickel (7440-02-0), up to 0.026 mg/L
Zinc (7440-66-6), up to 0.01 mg/L
18. Is this facility located on Indian country? (check one)
Yes ❑ No
19. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
146
Printed name of Person g Title
A4 4) /"-XV
ature of Applic Date
North Carolina General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false
statement representation, or certification in any application, record, report, plan, or other document files or
required to be maintained under Article 21 or regulations of the Environmental Management Commission
implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or
monitoring device or method required to be operated or maintained under Article 21 or regulations of the
Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable
by a fine not to exceed $25,000, or by imprisonment not to exceed six months, or by both. (18 U.S.C. Section
1001 provides a punishment by a fine of not more than$25,000 or imprisonment not more than 5 years,or both,
for a similar offense.)
Page 5 of 5 C-Mi 10108

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Draft Permit (October 17, 2018)

SWE
ROY COOPER
Cnrrrnar
MICHAEL S.REGAN
5erretary
LINDA CULPEPPER
interim Director NORTH CAROLINA
Environmental Quality
October 17, 2018
GIenn Young, Operations Manager �["�
The Quartz Corp USA /� 2 `
PO Box 309 0000
Spruce Pine,NC 28777 NC.
Subject: Draft NPDES Permit Renewals
Permits:NC0000353,NC0000400
K-T Feldspar Corporation and The Feldspar
Corporation facilities
Mitchell County
Grade PC2 Facilities
SIC code 1459
Dear Mr. Young:
Enclosed with this letter are copies of the draft NPDES permit renewals for your facilities. Please review
the drafts carefully to ensure thorough understanding of the requirements and conditions they contain.
There are several changes from existing permits, including the following:
• The NC 2007-2014 Water Quality Standards (WQS)Triennial Review was approved by the NC
Environmental Management Committee(EMC)on November 13, 2014. The US EPA
subsequently approved the WQS revisions on April 6, 2016 with some exceptions. The NC
Division of Water Resources NPDES Permitting Unit is required to implement the new dissolved
metal standards in all permits public noticed after April 6, 2016. The new standards for most
metals include acute standards. Further,the freshwater standards for several metals are expressed
as the dissolved form of the metals, and seven metals have hardness-dependent equations.As a
result,the NPDES Permitting Unit will need site-specific effluent hardness data and instream
hardness data,upstream of the discharge, for each facility monitoring these metals in order to
calculate permit limitations. Effluent hardness and instreamn hardness sampling,upstream of the
discharge,has been added to each permit at a monitoring frequency of quarterly, See Special
Condition A. (1.)Effluent Limitations and Monitoring Requirements for effluent and instream
sampling requirements.
• Sampling by the EPA in 2015 and stormwater monitoring data from several quartz/feldspar mines
in the region, in conjunction with the new dissolved metals standards noted above, indicates
aluminum, copper, lead, nickel, and zinc are pollutants of concern and quarterly monitoring has
been added to the permits.
• The NPDES Standard Conditions (Parts II, III, and IV) are not included with this draft. They can
be found at the following link if you would like to review them in conjunction with this draft permit.
hltps.i/bit.lti/ kV4m,�x
North Carolina Department oFEnvlronmentalQual[ry I Division of Water Resourcts
512 North Salisbury Street 116H Mall Service Center(Raleigh,North Carolina 27699-1611
n,ovA71AM

• Since your facilities are not subject to Federal Effluent Limitation Guidlelines,pH limits have been
changed from between 6.0& 10.0 standard units to between 6.0&9.0 standard units in accordance
with the pH WQS in 15A NCAC 02B. [See Special Condition A. (1.)]
• Please review the components list for each facility on page two,Supplement to Permit Cover Sheet.
• Please review instream monitoring locations in footnote 2 of Special Condition A. (1.) Effluent
Limitations and Monitoring Requirements.
• NC DEMLR will be evaluating stormwater data and may direct your facilities to apply for
individual NPDES wastewater coverage in lieu of stormwater general permit coverage under
NCG020000 prior to the expiration of that general permit. If that is the case, please be reminded
that DWR will require a major modification application and associated fee along with an
Engineering Alternatives Analysis for each facility at least 180 days prior to commencing discharge
of wastewater previously covered under NCG020000. Any additional discharge of fluoride must
be accounted for in a facility's fluoride allocation.
• Federal regulations require electronic submittal of all discharge monitoring reports(DMRs)and
program reports. The requirement to continue reporting discharge monitoring data electronically
using the NC DWR's Electronic Discharge Monitoring Report(eDMR)internet application has
been added to your NPDES permit. [See the final Special Condition in each permit]
Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in
the general Mitchell County area,soliciting public comments on these draft permits.Please provide any
written comments you may have to the following:NCDEQ/DWR,NPDES Permitting Branch, 1617 Mail
Service Center,Raleigh,NC 27699-1617 no later than 30 days after receipt of this draft permit.
Following the 30-day public comment period,the Division will review all pertinent comments and take
appropriate action prior to issuing final permits.If you have questions concerning these draft permits,
please call me at(919)707-3612 or by email at [e-mail].
Sincerely
11W
David Hill,Environmental Specialist II
NPDES Complex Permitting Unit
Hardcopy: NPDES Files
Ecopy: US EPA Region 4
DWR/Aquatic Toxicology Branch/Susan Meadows
DWR/NC Operator Certification Program/Maureen Kinney
DWR/Asheville Regional Office/Water Quality Regional Operations/Landon Davidson
DEMLR/Stormwater Program/Annette Lucas
Page 2 of 2

Permit NC0000353
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawfiil
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended
The Quartz Corp USA
is hereby authorized to discharge wastewater from a facility located at the
The Feldspar Corporation Facility
797 Altapass Road
Spruce Pine
Mitchell County
to receiving waters designated as the North Toe River in the French Broad River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, 1I, III and IV hereof.
This permit shall become effective Month XX, 2018.
This permit and authorization to discharge shall expire at midnight on February 28, 2022.
Signed this day Month XX, 2018.
I)RAI� I•
Linda Culpepper
Interim Director, Division of Water Resources
By the Authority of the Environmental Management Commission
N%W11

Permit NC0000353
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are
hereby revoked. As of this permit issuance, any previously issued permit bearing this number is
no longer effective. Therefore,the exclusive authority to operate and discharge from this facility
arises under the permit conditions,requirements,terms, and provisions included herein.
The Quartz Corp USA is hereby authorized to:
1. Continue to operate and maintain an existing 3.5 MGD wastewater treatment facility
consisting of the following components:
• Three clarifiers
• Polymer feed system
• Lime, alum,and polymer feed system _
• Vacuum filters <�
• Emico clarifier/thickener(E Cat)
• Two emergency generators
• Flow measuring and totalizit?gequipment
• Two recycle pumps
�l This facility is located-at The FeldsparCorporat by facility,797�Altapass Road, Spruce Pine
in Mitchell County
2. Discharge from said treatmentworksat the location specified on the attached map via Outfall
001 into:the No ah-Toe liver;c assifiecl C:Trout'`Water in the French Broad River Basin.
h �
2of8

Permit NCO000353
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.][Grade II Physical/Chemical Water
Pollution Control System 15A NCAC 08G .0306]
During the period beginning on the effective date of the permit and lasting until expiration,the permittee
is authorized to discharge treated process wastewater from Outfall 001. Such discharges shall be limited
and monitored)by the permittee as specified below:
PARAMETER CHARACTERISTICS EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER Monthly Weekly Daily Measurement Sample Sample
CODE Average Average Maximum Frequency Type Location2
Flow 50050 3.5 MGD Continuous Recording I or E
Total Fluoride 00951 174.0 lb/day <`<:: 348.0 lb/day Weekly Composite E
Total Fluoride 00951 Monitor&Re'ort /L) "",-'�--Weekly Grab U, D
,; '; 3137.0
Total Suspended Solids OD530 lb/day lb/day 1568.0 rJ!" WO kIly Composite E
Total Suspended Solids QD530 Monitor&Re . m /L >._ Week)`:- Grab U, D
00545 �,, ,.
Settleable Solids :Monitor&Reportt(mU�}r; Weekly Grab E
Turbidi 3 00070Monitor&Report Ct Weekly Grab E, U, D
H 00400 Bet 0,60'6V&4,0.0 Standard-Units Weekly Grab E U, D
Chloride4 00940 10 itor'URe'._rl m /L Quarterly Composite E
Chronic Toxicity5 _ P3 Ceriaa hnia dubiaf :. at 11% ;:;..Q
uarterly Composite E
Total Aluminum 01114 :. ::._ Monifo:&Re d°rt 'ILY%:..., Quarterly Composite E
Total Copper `>'' 01042' `:. Monit&F& e`ort /l. ..... Quafterly Composite E
Total Lead J` Ot051 Monitor&Re' rt /L Quarterly Com osite E
;. .;
Total Nickel `=:'QID67 y=,.-_Monitor&Re'. rt /L Quarter) Composite E
Total Zinc itor&Re'oit 1L Quarterly Composite E
Hardness, oils'` 6 =: = 00900>' Moff$t &-Repoit:(mg/L) Quarterly Composite E
CaCO3J066+M
Hardness T6W as Q0900 <::....Monitor&Report(mg/L) Quarterly Grab U
Footnotes: =''+:
1. The permitt&?Aall submit Disc harge Monitoring Reports electronically using NC DWR's eDMR
application sysfemt; See SpecialCondition A. (9.).
2. Sample locations 3=I uent,,.J':-"tf 1uent, U Upstream = at low water bridge, D-Downstream = at
Spruce Pine Park Upstrearf ;of.-Beaver Creek. Instream samples shall be grab samples and shall be
conducted weekly.
3. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 10 NTU. If
the instream turbidity exceeds 10 NTU due to natural background conditions,the discharge cannot
cause turbidity to increase in the receiving stream. Therefore,if the effluent measurement exceeds 10
NTU,the Permittee shall sample upstream and downstream turbidity in the receiving waterbody,
within 24 hours,to demonstrate the existing turbidity level in the receiving waterbody was not
increased.All data shall be reported on the DMRs. (See 15A NCAC 2B .0211 (21)). See Special
Condition A. (5.).
4. Chloride shall be monitored quarterly in conjunction with toxicity testing.
Footnotes continued next page
3 of 8

Permit NC0000353
Footnotes continued from A.(L)Effluent Limitations and Monitoring Requirements
5. Whole effluent toxicity will be evaluated using Chronic Toxicity (Ceriodaphnia dubia) P/F test at
11%during the months of January,April,July and October. See section A.(2.).
6. Effluent hardness should be performed in conjunction with testing for hardness dependent metals
(cadmium,copper, lead,nickel,silver,zinc).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (2) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B.0200 et seq.]
The effluent discharge shall at no time exhibit observai 'ulhibit'on of reproduction or
significant mortality to Ceriodaphnia dubia at amieffi lent concentration of 11%.
The permit holder shall perform at a minimum':guarterly monitoring using:test procedures
outlined in the `North Carolina Ceriodaphnia Chronc EffluentiBioassay Prrocedure, Revised
December 2010, or subsequent versions or"North Carokna;P] a'se II Chronic VV1 We Effluent
Toxicity Test Procedure" (Revised=*December 2010) or'sili`sequent versions. The tests will be
performed during the months of JaAutiaq 'April,July and October.These months signify the
first month of each three-month toxicity festing'quarter assigned to the facility.Effluent sampling
for this testing must be obtained during representative effluent discharge and shall be performed
at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as:"the first t6ttof any single quarter results in a failure or
ChV below the permit limit,,then multiple-concentration testing shall be performed at a
minimum, in:,each;of the two followirigmonths as'*described in "North Carolina Phase II
Chronic Whole Effluent Toxicity Test Procedure"(Revised-December 2010) or subsequent
versioas
All toxicity fisting results required as part:af this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1)for the months in which tests were performed,using the
parameter code TGP3B for the pass/fail results and THP313 for the Chronic Value. Additionally,
DWR Form AT-3 (original)is-to'"be sent to the following address:
-Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later
than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate,include all supporting chemical/physical measurements
and all concentration/response data,and be certified by laboratory supervisor and ORC or
4of8

Permit NC0000353
approved designate signature. Total residual chlorine of the effluent toxicity sample must be
measured and reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity
monitoring is required,the permittee will complete the information located at the top of the
aquatic toxicity(AT)test form indicating the facility name,permit number,pipe number,county,
and the month/year of the report with the notation of"No Flow"in the comment area of the
form. The report shall be submitted to the Water Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required,
monitoring will be required during the following month. Assessment of toxicity compliance is
based on the toxicity testing quarter, which is the three month time interval that begins on the
first day of the month in which toxicity testing is required by this permit and continues until the
final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Resources indicate potential impacts to the receiving stream,this permit may
be re-opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival,minimum control organism reproduction, and appropriate
environmental controls, shall constitute an invalid test and will require immediate follow-up
testing to be completed no later than the last day of the month following the month of the initial
monitoring.
A. (3.) BIOCIDES [G.S. 143-215.1(b)]
The permittee shall obtain authorization from the Division of Water Resources prior to utilizing
any new biocide in cooling water to be discharged. The permittee shall notify the Director in
writing, not later than ninety(90)days prior to instituting the use of any additional biocide used
in cooling systems,which may be toxic to aquatic life other than those previously reported to the
Division of Water Resources. Such notification shall include completion of Biocide Worksheet
Form 101 and a map locating the discharge point and receiving stream.No chromium,zinc,or
copper shall be added to the treatment system except pre-approved additives to biocidal
compounds.
A. (4.) WASTEWATER DIVERSION [G.S. 143-215.1(b)]
Diversion or bypassing of untreated wastewater from the treatment facility is prohibited.
A. (5.) TURBIDITY REOPENER [G.S. 143-215.1(b)]
This permit shall be modified,or revoked and reissued to incorporate new turbidity effluent
limitations in the event that violations of the turbidity standard of the North Carolina Water
Quality Standard occur as a result of this discharge.
5of8

Permit NC0000353
A. (6.) SOLIDS REMOVAL [G.S. 143-215.1(b)]
Solids removed or resulting from the wastewater treatment process shall be contained and
disposed of in such a manner as to prevent any contamination of the surface waters of the State.
A. (7.) FLUORIDE REOPENER[G.S. 143-215.1(b)]
This permit shall be modified, or revoked and reissued to incorporate new fluoride effluent
limitations in the event that acute or chronic bioassay testing or other studies results in a change
in the North Carolina Water Quality Standard for fluoride.
A. (8.) PERMIT MODIFICATIONS [G.S. 143-215.1(b)]
This permit shall be modified, or revoked and reissued to incorporate new limitations in the
event that production changes are requested or should any new fluoride using discharge request
to locate on the North Toe River.
A.(9.) ELECTRONIC REPORTING OF MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and
program reports. The final NPDES Electronic Reporting Rule was adopted and became effective
on December 21,2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of
this permit(Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reportine Requirements (Supersedes Section D. (2.) and Section E.(5) (a)]
The permittee shall report discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report(eDMR)internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each
month and submitted electronically using eDMR. The eDMR system allows permitted
facilities to enter monitoring data and submit DMRs electronically using the internet. Until
such time that the state's eDMR application is compliant with EPA's Cross-Media Electronic
Reporting Regulation (CROMERR), permittees will be required to submit all discharge
monitoring data to the state electronically using eDMR and will be required to complete the
eDMR submission by printing, signing, and submitting one signed original and a copy of the
computer printed eDMR to the following address:
NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
6of8

Permit NCO000353
If a permittee is unable to use the cDMR system due to a demonstrated hardship or due to the
facility being physically located in an area where less than 10 percent of the households have
broadband access, then a temporary waiver from the NPDES electronic reporting
requirements may be granted and discharge monitoring data may be submitted on paper
DMR forms (MR 1, 1.1, 2, 3) or alternative forms approved by the Director. Duplicate
signed copies shall be submitted to the mailing address above. See "How to Request a
Waiver from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month
following the issuance of the permit or in the case of a new facility, on the last day of the
month following the commencement of discharge.
Starting on December 21, 2020, the permittee must electronically report the following
compliance monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 316(b) Armual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to
Request a Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at
the time of each electronic submission. The permittee should use the EPA's website
resources to identify the initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the
entity (EPA or the state authorized by EPA to implement the NPDES program) that is the
designated entity for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool
for each type of electronic submission and for each state. Instructions on how to access and
use the appropriate electronic reporting tool will be available as well. Information on EPA's
NPDES Electronic Reporting Rule is found at:
https:_//www.fcderalreL,ister.gov/documents/2015/10/22/2015-24954/national-Mllutant-
disch artie-eli mi nation-system-ntld es-electronic-reWrti n e-rule
Electronic submissions must start by the dates listed in the "Reporting Requirements" section
above.
3. How to Request a Waiver from Electronic Reportin�(a
The permittee may seek a temporary electronic reporting waiver from the Division. To
obtain an electronic reporting waiver, a permittee must first submit an electronic reporting
7of8

Permit NC0000353
waiver request to the Division. Requests for temporary electronic reporting waivers must be
submitted in writing to the Division for written approval at least sixty (60) days prior to the
date the facility would be required under this permit to begin submitting monitoring data and
reports. The duration of a temporary waiver shall not exceed 5 years and shall thereupon
expire. At such time, monitoring data and reports shall be submitted electronically to the
Division unless the permittee re-applies for and is granted a new temporary electronic
reporting waiver by the Division. Approved electronic reporting waivers are not
transferrable. Only permittees with an approved reporting waiver request may submit
monitoring data and reports on paper to the Division for the period that the approved
reporting waiver request is effective,
Information on eDMR and the application for a temporary electronic reporting waiver are
found on the following web page:
]tt tIt:ll deb.nc.uo v/about/di vi sions/water-reso urces/edmr
4. Signatory Requirements [Supplements Section B. 11. b and Supersedes Section B.
(11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in
Part II, Section B. (I 1.)(a) or by a duly authorized representative of that person as described
in Part II, Section B. (I1.)(b). A person, and not a position, must be delegated signatory
authority for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an cDMR
user account and login credentials to access the eDMR system. For more information on
North Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account,
please visit the following web page:
/decF_nc.gov/abotit/di Sri si onsh�rater-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system
shall make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF
CERTIFICATION WILL BE ACCEPTED:
"I certify, under penalty of late, that this document and all attachments were prepared under
my direction or supervision in accordance with a system designed to assure that qualified
personnel properly gather and evaluate the information submitted. Based on my inquiry of
the person or persons who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility offines and imprisonment for knowing
violations."
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Permit NC0000353
5. Records Retention [Supplements Section D. (6.)]
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years from
the date of the report. This period may be extended by request of the Director at any time(40
CFR 122.41].
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