NC0084620_Wasteload Allocation_19950420

NPDES DOCIMENT :;CANNING COVER SHEET
NPDES Permit:
NC0084620
Unimin Crystal Operation
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
April 20, 1995
This; documeiit is printed on reuse paper - ignore any
coritent on the re -sr -ex -Ise side

NPDES WASTE LOAD ALLOCATION
PERMIT No).: NC0084620
PERNIITTEE NAME: UNIMIN Corporation
FACILITY NAME: Crystal Operation
Facility Status: Proposed
Permit Status: New
Major Minor
Pipe No.: 001
Design Capacity: 0.173 MGD
Domestic (% of Flow):
I rial (% of Flow): 100 %
Comments:
Fluoride allocation be moved from other facility/facilities. Modeler
should discuss w/ DJB.
RECEIVING STREAM: North Toe River
Class: C-Trout
Sub -Basin: 04-03-06
Reference'USGS Quad: D10NE
County: Mitchell
Regional Office: Asheville Regional Office
(please attach)
Previous Exp. Date: 00/00/00 Treatment Plant Class:
Classification changes within three miles:
Requested by: 7%
Prepared
Reviewe
Dana Boll en
by:MEM=
.yAV •. .
Date: 11/ 1/94
Date: 7.5
Date:
1-// /96-
Modeler
Date Rec.
#
..1—Mnl
ii /i44/1y,
go 51
Drainage Area (mi2 ) / R(0 Avg. Streamflow (cfs): ,Z3%
7Q10 (cfs) 4/ Winter 7Q10 (cfs) $ 2 30Q2 (cfs)
Toxicity Limits: IWC GS % Acu Chronic
Instream Monitoring:
Parameters flu& v64;(6,5 , /-4t.
Upstream Y LocationAoc.�crir; vf.►�c
Downstream Y Locationg4tivaj,
Chflaruaecntet ristics
44. - 4 Af)E I
)i1.,, /-
�; i .
BOD5 (mg/1)
NH3-N (mg/1)
D.O. (mg/1)
TSS (mg/1)
F. Col. (/100 ml)
pH (SU)
6 _ /a
7., .?es-;L
8A.c /tr/hy
/73,Z16s�
gi...,4, (1as/i()
5-O. a
/ a o, o (W 9)
is dirt 44,/,./7„/bicr(4_sc `‘,-,.6 0-(41
aC&'d h /f �..4.47. A44.1- 4 /6 il)? 1-�7.ji4Z- £X s /5 70
Comments: 414 n -A/ /c df(-4ig 5(4./�k,,fc4vse .rw�

urnmin
Quartz Operation
P. O. Box 588
Bakersville Hwy.
Spruce Pine, NC 28777
[phone]
Fax: [phone]
September 26, 1994
Mr. Michael R. Parker
Environmental Chemist
Water Quality Section
Division of Environmental Management
59 Woodfin Place
Asheville, NC 28801
SUBJECT: Construction and Operating Permit
UNIMIN Crystal Plant Waste Water Treatment
Mitchell County, North Carolina
Dear Mr. Parker:
RFC
for OCT 2 6 1994
As discussed during the meeting at The Feldspar Corporation's
office in Spruce Pine, North Carolina with representatives from The
Feldspar Corporation, Unimin Corporation, and your office, the Unimin
Corporation is planning to construct a 120 gpm (avg.) waste water
treatment facility at our Crystal Plant located off Carters Ridge
Rd., Mitchell County, North Carolina.
Please accept this letter as an Application for the
Authorization to Construct a Pre-treatment Facility. Unimin
Corporation's Crystal Plant is located in Spruce Pine, North Carolina
at Latitude 35 degrees 53 minutes 45 seconds/Longitude 82 degrees 03
minutes 15 seconds. As discussed, this Plant was purchased from The
Feldspar Corporation in March of 1991. As part of that Agreement,
The Feldspar Corporation agreed to accept the waste stream from the
Crystal Plant and treat said waste through their Waste Water
Treatment system which is covered under NPDES Permit #NC0000353 (see
attached portion of the contract).
Unimin is presently seeking an Authorization to Construct a
pre-treatment plant for the following reasons:
1) To provide equipment for improving the quality of the waste
stream before it reports on to T.F.C. for further processing.
2) Provide additional surge capacity to allow the Crystal Plant
to operate when T.F.C. is down.
3) To allow expansion of the capabilities of the Crystal Plant

Page 2
without increasing the waste loading as specified in our Contract
with T.F.C. This project calls for the addition of a thickener,
vacuum filter, tanks, and assorted pumps, sumps, and control devices.
avg.
This Wastewater Treatment Plant will be sized to flow at 120 gpm
The following are being provided as part of this request.
1) Attachment A - Location Map.
2) Attachment B - Crystal Plant Waste Flowsheet #44-94-0201.
3) Attachment C - Crystal Plant General Arrangement
#44-94-0202.
4) Attachment D - Treatment Plant Equipment List.
5) Attachment E - U.S. TVA Map of Site.
6) Attachment F - Pages #36 and #37 of Exhibit 8(N) of
Operating Agreement with and between Unimin and The Feldspar
Corporation.
7) Completed Standard Form C Applicant and Facility
Description.
8) A Permit fee check for $200.00.
9) Engineering Certification of Plans.
As discussed during our meeting, we need to proceed as rapidly
as possible with the permitting of this pre-treatment facility.
Thank you for your cooperation and consideration in this matter.
If you have any questions, please call me a 704-765-4283.
Sinc
Roy -. Riddle
Environmental Supervisor
cc: C. F. Stover
D. E. Voelker
C. Klimper
B. Shalter
J. Edney

. .
• •
•
N.;
4.
t•
1
1 : :
t • •
..,'EXHIBIT 8(n)
OPERATING AGREEMENT
•• „
OPERATING AGREEMENT dated this day of
1991 among Unimin Corporation, a Delaware corporation
. .
. " .
("Purchaser") and The Feldspar Corporation, a North Carolina
corporation ("Operating Subsidiary").
WHEREAS, the parties -hereto have executed and delivered
a certain Asset Purchase Agreement dated as of March 1991
(the "Purchase Agreement"), pursuant to which, on the date
hereof, B Corporation ("Seller") and/or Operating Subsidiary is
conveying to Purchaser the Crystal Site;
WHEREAS, the Feldspar Site is being retained by Seller
and/or Operating Subsidiary, and lies- adjacent and/or proximate
to the Crystal Site;
•
MBEREAS, Operating Subsidiary presently intends to,
. • '
continue operating a feldspar processing plant on the Feldspar
Site; and
A:\EXHIBIT8 -
. .

28. Fluoride Allocation. If, after receiving notice
under Section 6 hereof or after Purchaser gives Operator notice
that it wishes to construct its own waste treatment facility and
1
terminate this Agreement following completion of such facility
and the attainment of its own waste discharge permits, Purchaser
applies to the Department of Environment, Health and Natural
Resources, State of North Carolina (or successor or replacement
agency) for an NPDES permit or other appropriate permit to
discharge effluent into the North Toe River, Operator shall offer
to appropriate governmental permit authorities to have the
Existing NPDES Permit or the New NPDES Permit amended to reduce
Operator's average daily pounds per day of fluorides allowance by
50 pounds and to reduce Operator's daily maximum pounds per day
of fluorides allowance by 100 pounds in order to facilitate
Purchaser obtaining the maximum fluoride discharge level which
Purchaser is able to achieve in the permitting process. If, at
the time Purchaser applies for such permit, the daily average
pounds per day of fluorides permitted in the New NPDES Permit
applicable to Operator shall be a number other than 224 pounds,
then the foregoing figure of 50 pounds shall instead be 50
multiplied by a fraction of which the numerator is the daily
average pounds per day of fluoride then permitted under
Operator's New NPDES Permit and the denominator of which is 224.
If, at the time Purchaser applies for such permit, the daily
A:\EXHIBIT8 - 36 -

maximum pounds per day of fluorides permitted in the New NPDES
Permit applicable to Operator shall be a number other than 448
pounds, then the foregoing figure of 100 pounds shall instead of
100 multiplied by a fraction of which the numerator is the daily
maximum pounds per day of fluoride then permitted under
Operator's New NPDES Permit and the denominator of which is 448.
29. Correspondence With. Agencies. Purchaser shall
have the right to obtain from Operator from time to time
information and documents concerning Operator's compliance with
the Existing NPDES Permit or a New NPDES Permit. Copies of any
documents received by Operator concerning a possible violation of
the terms of such Permit, and Operator's responses thereto, shall
be promptly provided to Purchaser. Operator shall be relieved of
its obligations under this Section 29 on the Effluent Termination
Date.
A:\EXHIBIT8 - 37 -

•
w �
IN WITNESS WHEREOF, the parties hereto have executed
this Agreement under seal this _ day of , 1991.
41
ATTEST:
Title:
(Corporate Seal)
ATTEST:
Title:
(Corporate Seal)
By:
By:
UNIMIN CORPORATION
Title
THE FELDSPAR. CORPORATION
Title
W.14- pitted/4J A. WAY
gel,/ /67 NI-. A Dpitit-4-1444.1 iieLo
Psio
qpiqg
A:\EXHIBIT8 - 38 -

SEP 27 '94 16:24 UNIMIN MOORESVILLE NC
P.1
September 27, 1994
a
16507 Beech Hill Drive
Huntersville, NC 28078
[phone]
Mike Parker
Environmental Specialist •
NC Dept. of Natural Resources & Community Development
59 Woodfin Place
Asheville, NC 28801-0370
Re: Unimin's Spruce Pine Crystal Plant Waste Treatment Facility
Dear Mr. Parker.
I have examined Unimin Corporation's site proposed for a Waste Treatment located at their Crystal Operation In Spruce Pine, NC. I have reviewed Unimin DPlant
rawing
# 44-94-02-01, Revision #8 Titled "Crystal Plant Waste Plant FlowsheerUnimin
Waste Plant General
Drawing # 44-94-02-01, Revision #1 Titled "Crystal Plant W and Unimin
preliminary testing Arrangement". I am familiar with Unimin's
development. Both of these referenced drawings and flowsheet
practice. are based upon good engineering
These. two drawings do not constitute the entire design package
should be sufficient for permit review. The design and �s p 9 for this facility, but
as the work progresses to assure that it conforms to Installation should be monitored
the approved permit.
Sincerel
E. Reid Carlson, P.L.
NC #14471
ingleit
0 .t1• CARP ji�i
r.
00 ESS/p• Sir I
SE • it
144 7i • _ a
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-fieetiuuss

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TO:
FROM:
SUBJECT:
DATE:
urnrnrn
Unirnin Corporation
Engineering Department
d.R. Carlson and R. Riddle
J.W. Edney
Permit Information for the Crystal Waste Plant
ER 44-94-02
6 September 1994
I am attaching the following documents to be used for the permit application to the
State of North Carolina for the permit for the Crystal Waste Plant:
1) A Project Scope and Permit Information document
2) Crystal Waste Plant Fiowsheet, Drawing 44-94-02-01, Rev 6
3) Crystal Waste Plant General Arrangement, Drawing 44-94-02-02, Rev 1
4) Crystal Waste Plant Equipment List, Rev 1
These are the current documents detailing Unimin's plan for this facility and should be
used to obtain the permit.
Please be advised that earlier revisions of these same documents were sent to Bill
Shalter, and then forwarded to C. Stover, for this permit process. These documents are
no longer current and should be destroyed.
Please advise if you need any further assistance or information.

vrnmrn
Unimin Corporation
Engineering Department
1
Project Scope and Pennit Information
II
Crystal Plant Waste Plant
Spruce Pine, North Carolina
Part I - Assumptions
6 September, 1994
Revision # 0
John Edney
The following parameters and assumptions will serve as a BASIS for this Scope and Estimate:
1. The system will utilize elevation differential for conveyance of the waste flows where
possible.
2 The Eimco 50' dia Thickener with lattice type bridge, power raise and worm, now at the
Mica/Clay Plant, will be rebuilt and used on this project.
3. The system is based upon tonnages expected in the year 1999.
4 This project will be supervised by Corporate Engineering.
Part II - Design Criteria
The system will be installed as outlined on the attached Unimin Flowsheet 44-94-02-01, Rev 6,
and as detailed on Unimin General Arrangement Drawing 44-94-02-02, Rev 1, also attached.
The following are highlights of this information:
1. This waste plant design is based upon the Crystal Plant producing/shipping 7,300 T/Y,
which is expected in the year 1999.
2. Waste flow of 120 GPM containing:
200,110 T/Y of Water
1,092 T/Y of Waste Sand
1,848 T/Y of HF Acid
277 T/Y of HCL Acid
3. The intermittent flow from backwashing the sand filters will be pumped directly to the 50 ft
thickener.
4. The easement for the two (2) lines now going to TFC will have to be checked to make sure
that we can have access to the Toe River.

,Crystal Plant Waste Plant Project Scope and Permit Information
6 Sep 94, Rev O. JE
Part III - Detailed Scope
1. Primary Treatment - The present lime tank will be used with its present dust collector. Two
(2) each 100 gallon mixing tanks will be installed below the lime tank to prepare a milk of
lime solution that will be pumped to the new Low Shear Mix Tank. The raw waste stream
will be gravity fed to a 21,000 gallon Steady State Tank to "smooth out" the pH fluctuations
from the batch operation. The flow from the steady state tank to the low shear tank to the
thickener will be by gravity.
2. Thickening and Floc Addition - The 50 ft diameter thickener now at the Mica/Clay Plant
will be refurbished and brought to Crystal. The thickener rakes are in poor condition so new
rakes will need to be fabricated and installed. The 50 ft thickener underflow will be
pumped to a new Eimco Drum Filter with 150 SF of cloth area. Flocculant will be added
through three (3) metering pumps into the gravity flume to the feedwell of the thickener.
The thickener overflow will be pumped to a discharge point OR, if the pH is not correct, will
be pumped to the fiberglas tanks and retreated.
3. Add a Filter and Building - A building will be constructed to house a new filter and its
ancillary equipment. The filters will be elevated so that the cake can be dropped directly
into two new dumpsters for contract hauling to the landfill at the Quartz Plant. No money
has been included in this estimate for upgrading any of the facilities at the Quartz Plant to
receive this material.
4. Upgrade the Instrumentation and Electrical for this new Equipment - The pH control
system will need to be tied into the computer - PLC system now in operation at the plant.
All of the motors will start/stop from two locations, within the plant and at the Filter Building.
5. Provide Engineering Services for the Project- The design, purchasing and construction
supervision will be provided by Corporate Engineering. Money has been allocated to use
an engineer f orn other than the N.C. Office. Money has also been included to work on
obtaining the permits for this new facility.

Now I417 x 161-1
Low Shur Mx
Tank, Odom,
OutyJ Rubber
lined with 9aHlas
cRI
L
130 GPM as 35x 5ords
D
Dust Cofeetor -
Lima Tacit
Line Rite of —
2,436 Tons/Yr
-10GPMa35X%las
i D
21,000 Gallon
htoa+ly `state
Tank
4
Q
4
♦
Exis1tng Lime Plant
Overflow Pimp
`)and Filter Backwash
Water - Once/Week
300 GPM for 15 ran
120 E M Pion through 2
Consisting of:
I,0cf2 T/Y of yak!
200J10 T/Y of Water
1,846 T/Y of HP Acid
277 T/Y of HGL Acid
13uidng Over
burrpsters 4 Filters
12' rxrew Conveyor
ea 4' Line
a
— Fioo addition rate
of ,out 0.05 GPM
[Gont4r9Oi Tank
‘L...
31" Mcternj Pumps
d
J
81) x 6W Orum —
Filter with 150 5F
A cloth area
♦
d
pH Probe
Nebel 1
50 Ft Thickener
25GPM 0
35:c Soils
F �ateIump
(New
Diaphram Pump
lNerf
Thoro i' pro ends a 4' and
25' Ina to TM. One ++ be
used for this service. The
easement for these rocs 'el
rand to be chocked
Flow to River as Long
as pH is corroGt.
Vdvc closes *en pH
is out of compliance
103 GPM
Ex1511.15 Gdigixr
Pump, Relocated
Two Nei Fbcrglas
Talks
Baromotrio Leg
'^] 2 each Receiver Tarits
2 each 20 Yd3
stem
Cartilage Pit Purr
Vacuum Pump
Fitrate Pump
Contract Haul Skrrlge
to eatrtz PWrrt
/
N0TE5:
I. The 5u1turio Acid System Was taken out in Ray 5
pH Probe
with Chart
Recorder
'120GPMto
Toe River
5t ie
tinpler
relocated
from TFG.
Tanks ire aircadY
Connected
/
NMI
epd tei
7. a r :111v. 1w14
rt.
Grystd Plant Waste Plant Flowsfrcot
°r ,iey min ww M
Prs hcl' er 44-4 4-02
Locales 5rnu. Poo, t'
Scold None I Appe
Dv} No.
44- 14-02-01
R*x
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bil.•.Arw • .
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. . . . . . . • . • . • . . • .
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TM
rrr
tQ
NOTE: Refererwc braving 44-94-02-01
for flow information.
o -
Law
AIM Ne 100 Cubs
.../11utl'! 1.1. $. 11
.1•11•••. ...ram.
MEM
u.,.n ressmtlert
goat 1.
th+. h^ad ts. No. 4T11
t: y041 Plant Warta Plait
General Atranoement
Pr6J.d: G7et4 Vote rtot
Leodiat yrun Pr+., NG.
Drs. 144
44-a14-02-02
w.

CREQUIP.XLS
'Crystal
Plant Waste Plant Equipment List
E
ER 44-94-02
S
Sep 94, Rev 1
# •
Equipment Nomenclature
# Req'd
Size
DC-01
Dust Collector on Lime Tank
1
Existing
FL-01
Eimco Drum Filter
1
8' Dia x 6' Wide
FM-??
Flow Meter on Discharge
1
0 to 200 GPM
MT-01 iMixing
Tank w/Agitator
2
100 Gallon
MT 02
;Mixing Tank w/Agitator
1
14' D x 15' High
PR-01
pH Probe w/Chart Recorder
1
None
PU-??
'Vertical Pumps
2
10 GPM
PU-??
Diaphram Pump - Thickener OF
2
25 GPM
PU-??
Floc Metering Pump
3
.5 GPM
PU-??
Drainage Pit Pump
1
50 GPM
PU-??
Lime Plant Overflow Pump
1
Existing
PU-??
Ashe Pump, Between Mixing Tanks
1
Existing
PU-??
Galigher Pump to TFC
1
Existing
PU-??
Filtrate Pumps
2
10 GPM
PU-??
Vacuum Pump
1
Nash SC-6
Automatic Sampler
1
Stainless Constr
,SA-??
SC-??
Screw Conveyor under Filter
1
12" x 12'
TA-??
Dumpsters for Hauling Waste
2
20 Yd3
rTA-??
Floc Storage Tank
1
40 Gallon
TA-??
Lime Storage Tank
1
Existing
TA-??
Fiberglas Storage Tanks
4
Existing
TA-??
Vacuum Receiver Tanks
2
300 Gallon
TH-01
50 ft Thickener
1
50' D x 14' High
• Page 1

APR-10-1995 14:4a I-KUM
Utf"I kHItK U1JHUl lY 5tLf 1UN IU
Hr U 1-'.Vol./u4
Post•It" brand fax transmltta
ca 4..,a
•74,
7671
PtiCkfillQ
#et pages ► . f
(.,
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Steam:
Stream Classification:
Subbasin:
Regional fie:
Requester:
Date of Request:
Topo Quad:
S'AS'TEL,OAD ALLOCATION
Request # 8057
UNllvlllv�--�=rystal Operation
NC0084620
Industrial
Proposed
New
North Toe River
C-Trout
040306
Mitchell
Asheville
Bolden
11/14/94
D1ONE
Sgr.xn Charon ristira
USGS #
Da
Drainage Area (mi2): 126
Summer7Q10 (cfs): 41
Winter 7Q10 (cfs): 52
Average Flow (cfs): 239
30Q2 (cfs): 76.8
IWC (%): 0.65
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Facility requesting new NPDES permit UNIMIN-Crystal is currently being treated by
The Feldspar Corp. and TJNIIviIN wants to have an individual discharge permit_ Per ARO
discussion and negotiation, Feldspar will give up 50 permitted lbs of fluoride, T.TNIM7.N will
assume this 50 lbs and discharge into the North Toe River.
Special Schedule Requirements and additional comments from Reviewers:
Recommended b.
Reviewed by
bastreatxt Assessment:
Regional Supervisor:
Permits & Engineering:
aittfre
Date: 417195
tc lam: 4/0/"
._—Date:.41_° 5
RETURN TO TECHNICAL SUPPORT BY:
T0'd 6 J,ll1UflD 631Hf'1 Ol JNH33 06 at T T n�'-1sti H066 LT :ST S66T-0T-6d i

W-1W-1 JJ5 1414W MUM 1J J1 WH I hN I L LL I Y b.4l I JN I U
ARO P.02/04
•
2
TOXIMMETALSICONVENTIQNALP
of Toxicity Test; ACUTE TOX CITY-D P}1N]D 48HR LC54
Recommended Lit: OS
Monitoring Schedule: JAN APR JUL OCT
Bcsatttneodistanita
Mo. Avg, Daily Max. wQ or RL McY
Waste low (MGD): 0.173
i' Total Sasp. Residue Ohs/day): 86.6 173.2
Fluorides (lb/day): 50.0 100,0 WQ Weeldy
Settleable Solids WIl1): . Daily
Turbidity CNTU): nerve*
Daily
(ley- This discharge shall notturbidity increase of the receiving waters more than 10 . T�ab
If the turbidity exceeds 10 N'I J due to naturatcondiditos, the discharge shall not cause any
. ircreasc in turbidity.
Parameter(s) are water quality limed. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
No parameters are vwaterquality limited, but this discharge may affect future allocations,. "
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3
SEAM MOORING REQUIRENIENTS
Upstream on: Above the facility intake
Donau=Location; A� arl /�`t` Fad+ se 7dw�r �.� �.�.�., �,,,,
H
Special Instream monitoring Iccadons Mcaltonng frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
ftglinUnalmagamsSaCanditiona
Wasteland sent to EPA? (Major) fit_. (Y orN)
(If yes, then attach schematic, t+oxtcs spreadsheet, copy of model, or, if not modeled, then old
assumpdaas that were made, and description of how rt fits into basiawide plan)
Additional Iuformat{om attached? _ (Y or N) If yes, explain with attachment&
20'd d Alrld10 NalUM 01 d -Ba Oa ai i t ^a -Is-J WOdd LT :ST £6GT-0T-?.led

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•
PRO
Facility Name Unimin Corp. -Crystal won.... Permit # NC0084620 _ Pipe .# 001
ACUTE TOXICITY PERMIT uuM= (QRTRLY) .
The penmittee shall conduct MO toxicity tests on a carte
Document 14 5/013 entitled 'The Acute Toxicity of
monitoring4hoshall be The P LCSO of as ajbalmia Musing the p vie i
24bour
or
toxicity test less than_65_23%. Effluent samples for self-momtoring purposes must be obtained during
representative effluent discharge below all waste treatment. The IU� OGi' first test will be performed fromtie effective date of this permit dung the months of.JAN Ate. .
The parameter code for this test if using 12naggap is T.AA3D. The eier code for this test if using
Cethsktpluga is TAA3B. All molts required as of s permit condition will be entered on the
Form -1 for the month in which it was using the appropriate
Effluent Discharge ��.
parameter code. Addido ly, DEM Po= AT-1(original) is to be sent to the following address:
Attention: Environmental Scieaves Branch
North Carolina Division of
Environmental hiaaagement
4401 Reedy Creek Road
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical measmoments performed hi
association with the toxicity tests, as we'll as all doselz sponse data. Total o e wastestreamhlorine .f the
Should toxicity
sample must be measured and reported if chlorine is employed derma[
Shoff any single quarterly monitor stg indicate a failure to meet sped limits, then monthly monitoring will
begin y u dl such time that asingle testis passed. Upon passing, this monthly testament will
m the mots above.
reverttD quarterly spy
Should any test data, from either these wonitorin requirements or tests performed by the North Carolina Division
of Environmental Management indicate potent impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring muirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival and date q�shall constitute an invalid test and will require immediate
reg(widna�days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring ts.
P.e4/e4
7Q10 41cfs
Permitted Flow 0.173_ MC)
IWC 0.65 (16
Basin & Sub -basin FRBO6
Receiving Steam North Toe Kivu
County Kitchell
i
basis using protocols deed as defuutiveinE.P.A.
uents to Freshwater and Marine Organisins. The
4 hour stadc test, using effluent collected as a
stated methodology may at no time in any
Daphnid48 YerSton,td'1
t'O'd d 1U.I1df o BBium
01 fM-Bla ON aI I T ^a4fti WONd ST :ST S66T-OT-&i

UNIMIN CORP.- CRYSTAL OPERATION JMN
NORTH TOE RIVER 8057
040306 4/7/95
Per telecon w/ Mike Parker, UNIMIN-Crystal's waste is currently being treated by
The Feldspar Corp. Unimin has decided to discharge directly into the North Toe River,
they will discharge directly across from Feldspar Corp. Plant used to be owned by
Feldspar, they couldn't make a go of it and decided to sell it to Unimin. ARO and the ..
companies have negotiated the limits and the exchange of fluoride poundage. Feldspar will
take 50 lbs fluoride off their permit and 50 lbs will be placed on Unimin-Crystal's permit.
Will also have to modify Feldspar's permit for the deduction of 50 lbs fluoride.
ARO has developed limits for the Crystal Operation, they are as follows:
Qw = 0.173 MGD
Total Suspended Residue = 86.6 lbs/day - Mo. Avg.
= 173.2 lbs/day - Da. Max.
Fluorides = 50.0 lbs/day - Mo. Avg.
= 100. 0 lbs/day - Da. Max.
= 50 / 8.34 / 0.173 = 34.65 mg/1
= 100/ 8.34/0.173 = 69.3 mg/1
Acute toxicity @ 65% in JAN, APR, JUL, OCT * to coincide with Feldspar's tox
limit.
Effluent monitoring for settleable solids and turbidity.
Instream monitoring for fluorides, pH, and turbidity.
Qw = 0.173 MGD* 1.55 = 0.26 cfs
7Q10 = 41 cfs
Allowable Fluoride = ( 0.26 + 41) 1.8 mg/1 = 74.268 = 285.6 mg/1
0.26 0.26

Facility: Unimin corp=crystal
NPDES#: nc0084620
Receiving Stream: north toe river
Comment(s):
Low Flow Record Station Number
Hydrologic Area Number.
Drainage Area Low Flow Record Station:
Qave Low Flow Record Station:
s7010 Low Flow Record Station:
w7010 Low Flow Record Station:
3002 Low Flow Record Station:
Drainage Area New Site:
MAR New Site:
Qave per Report Equation:
s7010 per Report Equation:
w7Q10 per Report Equation:
3002 per Report Equation:
Drainage Area Ratio:
[ new DA/Daatgage I
Weighted Ratio:
Over -ride Inappropriate Site (y ):
gage number not available
03.4620.0000
HA10
104.00 miles squared
187.20 cfs
34.00 cfs
43.00 cfs
63.00 cfs
must be < 400 sq. miles
126.00 sq. miles
1.9 cfs/miles squared
239 cfs
39.20 cfs
57.11 cfs
82.35 cfs
Continue
1.21 :1
Continue
0.93 :1
Drainage Area New Site:
MAR New Site:
Weighted Qave per Report Equation:
Weighted s7010 per Report Equation:
Weighted w7Q10 per Report Equation:
Weighted 3002 per Report Equation:
126.00 miles squared
1.9 cfs/miles squared
239 cfs
41.05 cfs
52.45 cfs
76.75 cfs

UN IMIN-CRYSTAL OPERATION
Residual Chlorine
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ug/1)
Fecal Limit
Ratio of 152.9 :1
41
0.173
0.26815
17.0
0
0.65
2616.29
Ammonia as NH3
(summer)
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/1)
Ammonia as NH3
(winter)
7Q10 (CFS)
200/10om1 DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/l)
41
0.173
0.26815
1.0
0.22
0.65
120.26
52
0.173
0.26815
1.8
0.22
0.51
308.20
NC0084620
4/7/95

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
Nann B. Guthrie, Regional Manager
Asheville Regional Office WATER QUALITY SECTION
February 13, 1995
MEMORANDUM
TO: Dana Bolden i it
Permits and Engineering
THROUGH: Forrest R. Westall /�� Supervisor
Regional Water Qua ` n
FROM: Michael R. Parker
Environmental Chemist
SUBJECT: NPDES Staff Reports
The Feldspar Corporation NC0000353NC002
Unimin Corporation -Crystal
Mitchell County
for the
Attached to this memo are
CorNoDationaCrystalES stff rOperations tion•
subject facilities. Unimin P The Feldspar Corpora
wastewater is currently being treated by
to discharge. Unimin Corporation and The
and is proposing
Felds ar Corporation have entered 50t1bsnofagreement
fluoridelandwhich
UniminThe
P oration will give up
Feldspar Corp e this amount.
Corporation will assume this 50 lbs and discharge hi all oof
Ther
e will not be a change in the totalhamamount
discussedffluorides being
discharged to the North Toe River. are agreeable to
these limits with Unimin Corporation and they
them.
uestions or if I can be of assistance, please
If you have q
call me at 704/251-6208.
Interchange Building, 59 Woodfin Place, Asheville, N.C.
28801T elephone cycd/ l70-251-6208-consuFAX 704 251-6452
An Equal Opportunity Affirmative Action Employer

SOC PRIORITY PROJECT: Yes No X
IF YES, SOC NUMBER •
TO: PERMITS AND ENGINEERING UNIT
WATER QUALITY SECTION
ATTENTION: Dana Bolden
DATE: February 6, 1995
NPDES STAFF REPORT AND RECOMMENDATION
COUNTY Mitchell
PERMIT NUMBER NC0084620
PART I - GENERAL INFORMATION
1. Facility and Address: Unimin Corporation
Post Office Box 588
Spruce Pine, North Carolina 28777
2. Date of Investigation: Janaury 27, 1995
3. Report Prepared By: Michael R. Parker
4. Persons Contacted and Telephone Number: Roy Riddle
704/765-4383
5. Directions to Site:From the intersection of North Carolina
Highway 226 and North Carolina Secondary Road 1117, travel
east on NCSR 1117 approximately 0.55 mile. Turn north onto
private gravel road to Unimin Crystal Plant.
6. Discharge Point(s), List for all discharge points:
Latitude: 35°54'16" Longitude: 82°03'46"
Attach a USGS map extract and indicate treatment facility site and
discharge point on map.
U.S.G.S. Quad No.D1ONE U.S.G.S. Quad Name Spruce Pine, N. C.
7. Site size and expansion area consistent with application?
♦ X Yes ♦ No If No, explain:
8. Topography (relationship to flood plain included): •
Facility will not be subject to flooding.
Page 1

9. Location of nearest dwelling: Greater than 500 feet.
10. Receiving stream or affected surface waters: North Toe River
a. Classification: C-trout
b. River Basin and Subbasin No.: FBR 06
c. Describe receiving stream features and pertinent downstream
uses: fishing, wading, canoeing, fish and wildlife
propagation, agricultural, industrial water supply.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted 0.173 MGD (Ultimate
Design Capacity)
b. What is the current permitted capacity of the Wastewater
Treatment facility? not currently permitted
c. Actual treatment capacity of the current facility (current
design capacity
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two years:
January 9, 1995
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities:
f. Please provide a description of proposed wastewater treatment
facilities: The company is proposing to construct a flow
equalization tank, lime feed system, chemical additions,
sludge thickner, drum filter with vacuum system, sludge
conveyer, pH monitoring equipment, flow recorder and
totalizer, (4) fiber glass tanks for neutralization and
effluent flow equalization, pumps, piping and appurtenances.
Pumps and connection to the Feldspar Corporation will be
left in place in case there is a malfunction at Unimin
Corporation's wastewater treatment facility.
g. Possible toxic impacts to surface waters:
h. Pretreatment Program (POTWs only):
in development
approved
should be required not needed
2. Residuals handling and utilization/disposal scheme:
a. If residuals are being land applied, please specify DEM
Permit Number
Residuals Contractor
Telephone Number
b. Residuals stabilization: PSRP ♦ PFRP ♦ OTHER •
Page 2

C. Landfill: Residuals removed from this facility will be taken
to Unimin's Quartz Operations landfill.
d. Other disposal/utilization scheme (Specify): Sludge removed
from this facility will be taken to the landfill at Unimin
Corporation's Quartz Operations.
3. Treatment plant classification (attach completed rating sheet):
Class II.
4. SIC Codes (s) :1499
Primary 41 Secondary
Main Treatment Unit.Code: 51602
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds
or are any public monies involved. (municipals only)?
2. Special monitoring or limitations (including toxicity) requests: ♦,
3. Important SOC, JOC, or Compliance Schedule dates: (Please
indicate)
Submission of Plans and Specifications
Begin Construction
Complete Construction
Date•
4. Alternative Analysis Evaluation: Has the facility evaluated all
of the non -discharge options available. Please provide regional
perspective for each option evaluated. Not Applicable
Spray Irrigation:
Connection to Regional Sewer System:
Subsurface:
Other disposal options:
5. Other Special Items:
Page 3

PART IV - EVALUATION AND RECOI'fi1ENDATIONS -
Unimin Corporation has made application for a proposed discharge
of fluoride bearing wastewater to the North Toe River from the
processing of minerals to produce quartz. The total available
fluoride of 574 lbs/day in the North Toe River, is currently
divided between The Feldspar Corporation, Unimin Corporation -
Quartz and K-T Feldspar Corporation.
Unimin Corporation and The Feldspar Corporation have entered into'
an agreement in which The Feldspar Corporation will give up 50
lbs of its current fluoride allocation and give that allocation to
Unimin Corporation for use at its Crystal Operations. A copy of
the agreement is attached to this report.
The following limits should be included in the new permit.
LBS/DAY Units (Specify)
Monthly Avg. Daily Max.
Monthly Avg. Daily Max.
Flow
TSS 86.6
Fluoride 50
pH
Turbidity -This discharge shall
receiving waters more than 10
NTU due to natural conditions,
increase in turbidity.
Chronic Toxicity- has not been
Support
173.2
100
not
NTU.
the
0.173 MGD
6.0- 10.0 s.u.
increase turbidity of the
If the turbidity exceeds 10
discharge shall not cause any
determined yet -check with Technical
TSS Lbs/Day= 60 mg/1 x 8.34 x 0.173 MGD = 86.6
The TSS limits were developed by taking an average of the effluent
TSS self monitoring data submitted by The Feldspar Corporation and
Unimin Corporation -Quartz Operation for 1994.
The Feldspar Corporation's NPDES Permit will also have to be
modified. A staff report and draft permit for The Feldspar
Corporation is included as a separate attachment.
Unimin Corporation should address the "reliability requirements"
as listed in 15 NCAC 2H .0100 prior to permit issuance. After
this requirement has been adequately addressed it is recommended
that this permit be issued.
PAGE 4

Signature of Report Preparer
a7
Water Quality Regional Supervisor
s