NC0000361_Wasteload Allocation_19920826

NPDES DOCUMENT SCANNING, COVER SHEET
NPDES Permit:
NC0000361
Unimin Quartz 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:
August 26, 1992
This document is printed on x-euuce gaper - ignore any
content on the reYerrse aide

NPDES WAS 1'E LOAD ALLOCATION
PERMIT NO.: NC0000361
PERMITTEE NAME:
FACILITY NAME:
Facility Status:
Permit Status:
Major
Unimin Corporation
Spruce Pine - Mica Operations
Existing
Renewal with Modification
Minor
Pipe No.: 001
Design Capacity: 2.16 MGD
Domestic (% of Flow):
Industrial (% of Flow): 100 %
LA Fa _
Za D a6 Qm
Comments:
mineral processing of clay and mica, modification is the addition of
gasoline contaminated groundwater in spray form over an existing
settling pond system. The 40 CFR regs are reserved for this type
discharge. no limits given.
RECEIVING STREAM: the North Toe River
Class: WS-III-Trout
Sub -Basin: 04-03-06
Reference USGS Quad: D 11 NW (please attach)
County: Avery
Regional Office: Asheville Regional Office
Previous Exp. Date: 2/29/92 Treatment Plant Class: Class II
Classification changes within three miles:
Requested by:
Prepared by;
Reviewed
AJA -
Date: 5/13/92
Date: 8
Date: ! a�
lL
Modeler
Date Rec.
#
Turf
Sits!gz..
(0135
Drainage Area (mi` ) ' 9 6, 5 Avg. Streamflow (cfs):
7Q10 (cfs) 3o Winter 7Q10 (cfs) ? 9 30Q2 (cfs) SS
Toxicity Limits: IWC /67" % Acu
Instrearn Monitoring:n
/
Parameters 'c'td' 4/h I ftf/£4'
Upstream
YLocation ,&o/•i /9°4,
Downstream Y Location Fes„ i'/id 1 4 /3v"37 L
Effluent
Characteristics
Prr,`r ,' ��.::,, �.
(4141.
BOD5 (mg/1)
NH3-N (mg/1)
D.O. (mg/1)
TSS (mg/1)
,Zd
30 (et)
F. Col. (/100 ml)
pH (SU)
G — /d (639)
%L,J. (1/s/0
%fit c�i�Jfuiws(J-(t�vin/1,a!/lwt,.tJ
ivo . /4 . !0/ 71), tT 161r�
/ 6v 3 -.) y'%
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£XcLf1) 161v7V ..1.X ik
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41177 (/1 f
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L .wr/L J/l�ite/T/CAW tiNc/yt6J/E,iu
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LIGNT•DUTY ROAD. HARD OR
IMPROVED SURFACE
Latitude 35°56'20" Longitude 81°59'45"
Map # D11 SW
Sub -basin 040306
Stream Class C-Trout
Discharge Class 41
Receiving Stream
North Toe River
Design Q 2.16 MGD Permit expires 12/31/0,1
DISCHARGE LOCATION
UNIIvIIN CORPORATION
SCHOOLHOUSE QUARTZ OPERATION
NC0000361
NORTH TOE RIVER
Unimin Corporation
NC0000361
Avery County
Schoolhouse Quartz Site

unimin
UNIMIN CORPORATION
Corporate Geology
Environmental Affairs
Mine Planning
AtAtic-)M0,/
/tJCoo co T6 /
U,
State of North Carolina, Dept, of EHNR
Permits and Engineering Unit
Division of Environmental Management
P.O. Box 27687
Raleigh, NC 27611-7687
RE: Modification of Permit NC0000361
1992
UNIMIN Corporation, Spruce Pine Mica operations, requests
modification of existing NPDES permit, NC0000361. The proposed
modification would allow for the discharge of gasoline contaminated
groundwater in spray form over an existing settling pond system. The
maximum amount of water discharged is expected to be 250 GPD. •
Basically, one pump will be set up to convey groundwater from the
monitoring well to a sump. A second pump system will take the sump
contents and spray them over the pond; the pump will generate
sufficient head to spray the contaminated water at least 30 feet into
the air. Timers and/or level devices will be utilized so that pumps
are not activated until a determined water level is present.
This water would eventually report to the 001 outfall. Only a
minimal amount of groundwater contamination is present, both in terms
of aerial extent and degree of contamination. Given that "misting" the
pumped groundwater will cause most organic contaminants to volitilize, .
and the dilution factor involved (dilution from other process and storm
water inflows into the pond system), any increase in contaminants from
outfall 001 is expected to be negligible. Assuming a worst -case
scenario, pumping 250 gallons of water from the most contaminated well
to the pond would equate to a maximum addition of .000003 pounds of
benzene to the pond (assuming no treatment efficacy).
Enclosed is a completed Short Form C, a USGS topo sheet, and a
check in the amount of $400.00.
If you have any additional questions, please feel free to contact
me.
SMA:NCPERMIT:klh
Enclosures
Sincerely,
6)4 vvt1Z.L
Susan M. Armentrout
Sr. Environmental Specialist
CC: John Edney (UNIMIN), Andy Regis (UNIMIN), Bill Shalter (UNIMIN)
402 Mill Street • P.O. Box 297 • Utica, IL 61373 • [phone] - Fax [phone]

Part III
Permit No. NC0000361
F. Explanation of Effluent Limitations Page
North Carolina Water Quality Standards allow a maximum instream
fluoride concentation of 1.8 mg/l. Based on a seven day, ten-year
low flow of 38 cfs in the North Toe River at the mouth of Little
Bear Creek, a maximum of 754 lbs/day of fluoride can be discharged
to the .river.
At the time of. this permit issuance, there are three companies which
have permits that allow the discharge of fluoride bearing wastewater
and a fourth company which has just been issued a permit to
discharge wastewater containing fluoride. Three of the four
companies have indicated that they will construct or are in the
process of constructing new ore production facilities. Because the
North Toe River and each facility's wastewater interacts with the
other, the following scenarios (Configurations I -VI) were developed
based on construction schedules and data submitted by each company.
Six effluent limitation pages were developed based on these
scenarios.
Configuration -
I - Unimin Corporation (mica) not producing feldspar or
quartz. The Feldspar Corporation operating without
the planned high purity quartz facility, Indusmin
at current feldspar production and Unimin
Corporation (quartz) producting feldspar and high
purity quartz at current levels.
Configuration II - Unimin Corporation (mica) not producing feldspar or
quartz, the Feldspar Corporation operating with the
high pruity quartz facility and Indusmin, Inc. and
Unimin Corporation (quartz) as described in I.
Configuration III - Unimin Corporation (mica) producing feldspar and
quartz and the other three comanies as described
in I.
Configuration IV - Unimin Corporation (mica) as in III., the Feldspar
Corporation producing high purity quartz and the
other two companies as described in I.
Configuration V - Unimin Corporation (mica) as in III., the Feldspar
Corporation and Indusmin, Inc. productiog high
purity quartz and Unimin Corporation (quartz) as
described in I.
�' NI12 )300
Confi.&uration VI - The Feldspar Corporation, Unimin CoOration 4tA
(quartz) , Indusmin, Inc and Unimin j . -_'`1
(mica) as described in V., and Ind,�m, wi
a 50% expansion of the feldspar pl..t.04

Part III
Permit No. NC0000361
G. The Company will notify the Division of Environmental Management and
each of the other feldspar mining companies identified below, by
certified mail, 90 or more days before any or all changes in
production or process which will result in any increase or reduction
in the amount of fluoride being discharged to surface waters in
accordance with Configurations I -VI as listed in Condition No. F.
Regional Supervisor
NC Division of Environmental Management
PO Box 370
Asheville, North Carolina 288002
President
The Feldspar Corporation
PO Box 99
Spruce Pine, NC 28777
Operation Manager
Unimin Corporation
Unimin Mica
PO Box 628
Spruce Pine, NC 28777
Operation Manager
Indusmin, Inc.
PO Box 308
Spruce Pine, NC 28777
Operations Manager
Unimin Corporation
Unimin Quartz
PO Box 545
Spruce Pine, NC 28777
On the basis of the company notification, the Division of
Environmental Management, Asheville Regional Office will confirm to
each company by registered letter sixty (60) days prior to a change
in effluent limitations. The letter will state which effluent
limitations (configuration) will be applicable and the date they
become effective. Each company will be required to comply with the
limitations change on the date they become effective.
H. Toxicity Reopener
This permit shall be modified, or revoked and reissued to
incorporate toxicity limitations and monitoring requirements in the
event toxicity testing or other studies conducted on the effluent or
receiving stream indicate that detrimental effects may be expected
in the receiving stream as a result of this discharge.
I. In the event that violations of the turbidity standard of the North
Carolina Water Quality Standards occur as a result of this
discharge, this permit shall be modified, or alternate y 1 oked
and reissued to incorporate limitations sufficient to;,pr.ot444he
receiving waters.
J. The wastewater treatment facilities shall be properly -maintained;-a,nd
operated at all times.
CSC
K. Diversion or bypassing of untreated wastewater fro',..'"the tXeatmeA '-
facility is prohibited. ' %•=,;. � �
L. 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.

Part III
Permit No. NC0000361
M. This permit shall be modified, or revoked and reissued to
incorporate new fluoride effluent limitations in the event that
acute and chronic bioassay testing or other studies result in a
change in the North Carolina Water Quality Standard of fluoride.
N. This permit shall be modified, or revoked and reissued to
incorporation new limitations in the event that production changes
are requested by any of the existing fluoride using industries or
shouldanynew fluoride using discharge request to locate on the
North Toe River.

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Unimin Corp -Spruce Pin
NC0000361
Industrial - 100%
Existing
Modification
The North Toe River
WS-III Trout
040306
Avery
Asheville
-arona-
12/20/91
D11NW
Request # /33
e-Mica Operations (PIPE 001)
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
96.5
30
39
165
55
10
c.s
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Facility requesting renewal of existing NPDES permit. One of the four fluoride bearing waste
dischargers into the North Toe River. All facility permits are interdependent because total
assimulative capacity of fluoride is allocated between the four industries and all permits should be
issued at the same time per the Asheville RO.
**Modification to pipe 001 to add gasoline contaminated groundwater in spray form over existing
settling pond.**
Special Schedule Requirements and additional comments from Reviewers:
Recommended by:
Reviewed by
Instream Asse. ent: C( Lvc,,,,,dusge-K)Date: l'-thD-
Regio al : ; sor: � Date: �� 9
Permits Engineerin(--)g: Date: gr/7I' Z
RETURN TO TECHNICAL SERVICES BY:
SEP 0 3 1992
RECEIVED
Water Quality A.ctiom
AUG 6 - 1992
Asheville Regional 0
Asheville, North Carotin

2
TOXICS/METALS/CONVENTIONAL PARAMETERS
Type of Toxicity Test Chronic pass/fail
Existing Limit:
Recommended Limit: 10 %
Monitoring Schedule: APR JUL OCT JAN
Fxisting.Limits
Daily Average Daily Max.
Wasteflow (MGD): 2.16
TSS (mg/1): 20 30
pH (SU): 6-10
Turbidity (NTU):
Temperature (C): **
Settleable solids (ml/1): monitor
*The discharge shall not increase turbidity of receiving waters mote than 10 NTU. If the turbidity exceeds 10 NTU
due to natural conditions, the discharge shall not cause any increase in turbidity.
** The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream
of more than 0.5 degrees C and in no case cause the ambient water temperature to exceed 20 degrees C.
Recommended Limits
Daily Average Daily Max. WQ or EL
Wasteflow (MGD): 2.16
TSS (mg/1): 20 30 EL
pH (SU): 6-10
Turbidity (NTU):
Temperature (C): **
Settleable solids (ml/1): monitor
Toluene (ug/1): 183 WQ
Benzene (ug/1): monitor WQ
Methyl Tert Butyl Ether (ug/1): monitor WQ
*The discharge shall not increase turbidity of receiving waters mote than 10 NTU. If the turbidity exceeds 10 NTU
due to natural conditions, the discharge shall not cause any increase in turbidity.
** The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream
of more than 0.5 degrees C and in no case cause the ambient water temperature to exceed 20 degrees C.
Limits Changes Due To: Parameter(s) Affected
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
New pretreatment information
Other (onsite toxicity study, interaction, etc.)
X Parameter(s) are water quality limited. 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 water quality limited, but this discharge may affect future allocations.
--a— ;•')rcS L
T-11
l6 3

3
INSTREAM MONITORING REQUIREMENTS
Upstream Location: Kaolin Pumphouse
Downstream Location: Franklin Town Bridge
Parameters: Fluoride, turbidity,pH,settleable matter
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Minimum treatment will include an oil/water separator, air stripping or diffused aeration and activated cal
adsorption.
Design and Construction of the Water Treatment Facility will emphasize the use of plastic pipes and fittir
where practically possible.
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

Facility Name iiimit £ - Acn d 4
Permit# AC000`' 361/ Pipe# a°
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
(**Chronic Toxicity (Ceriodaphnia) P/F at /* %, RNA0906-Na'i, See Part Condition 6-.)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is /0 % (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
guarter(v monitoring using this procedure to establish compliance with the permit condition. The first test will be
performed after thirty days from the effective date of this permit during the months of
, ii y 4 v6- gv ✓ . Effluent sampling for this testing shall be performed at the NPDES
permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DEM Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607-6445
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Environmental Management 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 and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring requirements.
7Q10 10 cfs
Permitted Flow .2. /6 MGD
IWC% /°
Basin & Sub -basin PRO, 64
Receiving Stream Nbft'
County Rv
QCLR Version 9/91

RFCEIVFD
Water Qur.-1 ty ,Sctan
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Unimin Corp -Spruce Pine -Mica
NC0000361
Industrial - 100%
Existing
Renewal
The North Toe River
WS-III Trout
040306
Avery
Asheville
Barona
12/20/91
D11NW
Request #
Operations (PIPE
JUN _
IvJ
6681
001stieville Regional Off:
Asheville, North Carotin
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
96.5
30
39
165
55
/0 ,
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Facility requesting renewal of existing NPDES permit. One of the four fluoride bearing waste
dischargers into the North Toe River. All facility permits are interdependent because total
assimulative capacity of fluoride is allocated between the four industries and all permits should be
issued at the same time per the Asheville RO. f/ Or geitsco _Ave. r -f - a', d 00z/
t»
Special Schedule Requirements and additional comments from Reviewers:
4 °Afr t,1 ,"ZQPe. 6c.//vf 10X/ . / ^ A /140A/,r, , n) Si4r"t,+2 ),,ii • M s
(2,t.,,.o&.4 P/44/� ,,✓ "4'iz /, C/ V n��l,�v`. A�-'•"")- n.447 .
Recommended by: °'cS
Reviewed by 0 b
Instream Assessor nt:
Regiona sor:
Permits Engineering:
Date:
Date: 5/20/92
S/L7/ 9 z
Date:
Date: � /
--7/(Vq
RETURN TO TECHNICAL SERVICES BY:
JUN 2 7 1992

2
Type of Toxicity Test
Existing Limit:
Recommended Limit
Monitoring Schedule:
Existing Limits
TOXICS/METALS/CONVENTIONAL PARAMETERS
C,yiCoN/G rW.f/ AVG.
/oil'
Daily Average Daily Max.
Wasteflow (MGD): 2.16
TSS (mg/1): 20 30
pH (SU): 6-10
Turbidity (NTU): *
Temperature (C): **
Settleable solids (ml/1): monitor
*The discharge shall not increase turbidity of receiving waters mote than 10 NTU. If the turbidity exceeds 10 NTU
due to natural conditions, the discharge shall not cause any increase in turbidity.
** The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream
of more than 0.5 degress C and in no case cause the ambient water temperature to exceed 20 degrees C.
Recommended Limits
Daily Average Daily Max. WQ or EL
Wasteflow (MGD): 2.16
TSS (mg/1): 20 30 EL
pH (SU): 6-10
Turbidity (NTU): *
Temperature (C): **
Settleable solids (ml/1): monitor
*The discharge shall not increase turbidity of receiving waters mote than 10 NTU. If the turbidity exceeds 10 NTU
due to natural conditions, the discharge shall not cause any increase in turbidity.
** The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream
of more than 0.5 degress C and in no case cause the ambient water temperature to exceed 20 degrees C.
Limits Changes Due To: Parameter(s) Affected
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
New pretreatment information
Other (onsite toxicity study, interaction, etc.)
Parameter(s) are water quality limited. 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
X_ No parameters are water quality limited, but this discharge may affect future allocations.

3
INSTREAM MONITORING REQUIREMENTS
Upstream Location: Kaolin Pumphouse
Downstream Location: Franklin Town Bridge
Parameters: Fluoride, turbidity,pH,settleable matter
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditionq
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

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STREAM DATA
INSTREAM SELF•MONITORING DATA
MONTHLY AVERAGES
Discharger: ()/i/l, if) /L, r 1>
Receiving Stream: /'/iv,i /,..-./,,�
Upstream Location:
DATE
O-ct9
Mdy-9'
Mar-9
Feb-9
Jan-9
Dec-9
Nov-9
Oct-9
Sep-9
Aug-9
Jul-9
Jun-9p
May-90
Apr-90
Mar-90
Feb-9i
Jan-90
Dec-89
Nov-89
Oct-89
Sep-89
Aug-89
Jul-89
Jun-89
May-89
Apr-89
Mar-89
Feb-89
Jan-89
TEMP
7 J/2Fj/0, >1 f&do 400
AJe�t-9- ,
}
r.
-
1
i
R 6, del , vs-z
L 7,75 ,sSy
P. 7; 33 . 97/
d // y 's-
r y, 7 C. J.J
' S,,$) z,`
i 6, 4/ . �r
/o,f /,2."-
//,7 .-,zs
/S,/ , 3,6
/7, 2 t. 25
/o•/ ',2S
/,3 ' - Zf
Permit No. de. J)JJ
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PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Type of wastewater: % Domestic
100 % Industrial
a. Volume of Wastewater: 001- 2.16 MGD (Design Capacity)
002- 0.300 MGD
b. Types and quantities of industrial wastewater:
Discharge 001-Mineral Processing of Clay and Mica and
groundwater remediation of gasoline
Discharge 002-Mineral Processing of Quartz.
c. Prevalent toxic constituents in wastewater: Fluoride,
benzene, toulene, ethylene and xylene.
d. Pretreatment Program (POTWs only):
in development approved
should be required not needed
2. Production rates (industrial discharges only) in pounds per day:
1765 tons/day of raw ore.
a. Highest month in the past 12 months: lbs/day
b. Highest year in the past 5 years: lbs/day
3. Description of industrial process (for industries only) and
applicable CFR Part and Subpart: The milling, processing and
flotation of ore to produce feldspar, clay, mica and silica
quartz. Mica and silica quartz ai-e by products of the feldspar
flotation process. In accordance with 40 CFR Part 436 Subpart
I -Mica and Sericite Subcategory and Subpart AI -Feldspar
Subcategory have been reserved. No effluent guidelines have been
developed for this industry. The discharge will now include the
discharge of water from a groundwater remediation of a gasoline
spill.
4. Type of treatment (specify whether proposed or existing): The
existing wastewater treatment facility consists of an influent
lift station, screw classifier, two hydrocyclones, three inorganic
solids settling basins operated in series, continuous pH recorder,
automatic effluent pH control system with control units on the
Page 2

lime and sulfuric acid feed systems, baffled flume to improve
mixing and continuous flow recording and totalizing and the
proposed wastewater treatment facility for Discharge 002 will
consist of a tailings thickener, waste neutralization and tailings
pond with continuous flow recording and totalizing equipment.
The groundwater remediation facilities will consists of the
following: the groundwater would be pumped from the well to a sump
and the water would be pumped from the sump to a spray apparatus
where the contaminated water will be sprayed into the existing
wastewater treatment ponds. The spraying is to volitilize the
gasoline contaminants and the remaining residues would be diluted
by the mining wastewater in the ponds.
5. Sludge handling and disposal scheme: Tailings from the wastewater
treatment facility are landfilled in old mine sites.
6. Treatment plant classification (attach completed rating sheet):
Class II.
7. SIC Codes(s): 3295
Wastewater Code(s): Primary 41 Secondary 82
Main Treatment Unit Code: 51502
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant funds
(municipals only)?
2. Special monitoring requests:
3. Additional effluent limits requests:
4. Other:
PART IV - EVALUATION AND RECOMMENDATIONS
Unimin Corporation -Mica Operation has requested renewal of NPDES
Permit No. NC0000361 for the continued discharge of industrial
process wastewater for the production of mica and clay and to
construct additional processing and wastewater treatment
facilities for the production of feldspar and silica quartz from
their plant in Avery County near Spruce Pine, North Carolina.
There are no effluent guidelines for this industry and the
effluent limits were developed using production and process
information and the North Carolina Water Quality Standard for
fluoride of 1.8 mg/1. There are four. companies, Unimin
Corporation -Mica Operation, Unimin Corporation -Quartz Operation,
The Feldspar Corporation and K-T Feldspar Corporation which have
similar industrial processes and wastewater characteristics. Each
Company discharges or proposes to discharge to the North Toe
River. It has been determined that there is a maximum
Page 3

assimilative capacity of 574 lbs/day of fluoride in the North Toe
River at the mouth of Little Bear Creek, which is the most
downstream point fluoride is discharged. All four Permits are
interdependent on each other because of the total assimilative
capacity of the fluoride is allocated between the four •industries
and all permits should be issued at the same time.
Because of existing agreements between the four Companies and the
Division of Environmental Management, Unimin Corporation -Mica
Operations, is now proposing to construct industrial processes
which will utilize fluoride in the process. This agreement was
developed for the existing NPDES Permits based on different
operational plans each Company had proposed. With Unimin
Corporation -Mica Operations exercising its option, Configuration
IV, in the existing NPDES Permits will now become the effluent
limitations.
Effluent limitations and the development of these limits are
listed in the draft permit and fact sheet, respectively.
It should be noted that this discharge is to "WS-III-trout"
waters. The Town of Spruce Pine is going to use this water for
drinking water purposes; however, the proposed site of the intake
structure may be above or below this discharge.
Unimin Corporation has made application to discharge wastewater
from a groundwater remediation project to removed groundwater
which is slightly contaminated with gasoline. The treatment
scheme for the groundwater is to pump the water into a sump and
then pump the water through a spray device over an existing pond
which is a part of the existing wastewater treatment system. It
is proposed to pump approximately 250 gallons per day from the
well and use the spray to volitize the contaminants. The
wastewater would be discharged through the existing 001 discharge
location.
The company anticipates this remediation project to last no more
than six months.
The proposed Spruce Pine water plant has not been constructed and
is most likely that the remediation process will be completed
should the Town of Spruce .pine locate the intake below the Unimin
Corporation discharge.
If there are no substantial objections from the Water Supply
Branch or the public it is recommendedthat the permit be issued.
Signature of Report Preparer
er Quality Regional Supervisor
Date