NC0000361_Draft Permit_20120314

Adir:„A
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P. E. Dee Freeman
Governor Director Secretary
March 14, 2012
Mr.Jeffrey S. Ferguson,P.E.
Unimin Corporation
P.O.Box 588
Spruce Pine,NC 28777
Subject: Draft NPDES Permit
Permit No.NC0000361
Unimin Corporation-Schoolhouse Quartz Facility
Facility Class II
Avery County
Dear Mr.Ferguson:
The Division of Water Quality.(DWQ)has drafted a NPDES Permit for the above
referenced facility. The permit authorizes Unimin Corporation to discharge up to 2.16 MGD of
treated process wastewater from Schoolhouse Quartz Facility to the North Toe River,a class C-
Trout water in the French Broad River Basin. The draft permit includes discharge requirements
and/or limitations for flow,total fluoride,total suspended solids,turbidity,chlorides and other
parameters.
The following modifications were made to the draft permit:
• The facility address was updated to 107 Harris Mining Company Road,
Highway 19E in Spruce Pine,NC.
• Oil and grease monitoring will no longer be required based on the results of
submitted data.
• There was a minor language change on the effluent page regarding the turbidity
footnote.
• The monitoring frequency for total fluoride,total suspended solids,turbidity,
settleable solids and pH was reduced to weekly on effluent page A(1).
• Language on the permit cover page regarding the discharge of stormwater was
removed.
1617 Mail Service Center,Raleigh,North Carolina 27699-1617
Location:512 N.Salisbury St.Raleigh,North Carolina 27604
Phone:[phone] FAX:[phone] Customer Service:1-877-623-6748
Internet www.ncwateroualitv.orq One
NorthCarolina
An Equal OpporWnityl Affirmative Action Employer Naturally

Mr.Ferguson r
March 14, 2012
Page 2 of 2
• Language on the supplement to cover permit page regarding the discharge of
mine dewatering effluent and stormwater was removed. The Schoolhouse
Facility will be issued an individual stormwater permit to address stormwater
management and monitoring. In addition,the entire section(Part II in the
previous permit)regarding stormwater monitoring,controls and limitations for
permitted discharges was removed from the permit
• Language in Condition A.2.Chronic Toxicity Permit Limit was modified and a
new paragraph regarding data submittal was added (the second paragraph from
the end of the condition).
•
At this time, the Division is submitting a notice to the newspapers of general circulation
in Avery County, inviting comments from you or your representative, the public and other
agencies on the draft permit. The notice should be published on or about March 21, 2012.
Following a 30-day comment period, we will review all pertinent comments received and
take appropriate action on the permit issuance.
Please provide written comments on the draft permit no later than April 23, 2012. If
you have any questions,please contact me at(919)807-6386 or [e-mail]
Res•-ctfully,
.44
jacq M.Now 11
Co ex Permitting Unit
Attachments
cc: Asheville Regional Office/Surface Water Protection Section(ecopy)
Aquatic Toxicology(ecopy)
NPDES File

NC0000361
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWAT : ER THE
NATIONAL POLLUTANT DISC �; S , IMINATION SYSTEM
In compliance with the provisions of No ? < N`"oliva General S`o vM e 143-215.1, other lawful
standards and regulations promulgated . ``< ;+opted by the Nor "'` > oliva Environmental
Management Commission,and the Federal Poll ; <`< . Control `` >:;•s amended,
< .,'min Cor•
¢ 'ion
herebyauthorized to discharge w:`: >>;;*m a fa"'` _; located at the
is g
o
Sc
;. :
a
'li
07 H '=' inin `Yc a an Ro `' ' ighway 19E
>' A �,F . County
..
� �., in
v r Das
in
nchB
road Kie
.� intheF e
����� 'e' To�� 'ver
to receiv': ;<< :.r: i r<. a` th
•
in accord:' >,.:with efflue `" n 'tati' }` ;.:; onitoring requirements,and other conditions set forth
in Parts I,II, and IV herr.
The permit shall bec ' < .`, e)00000000000(X)000000a.
This permit and the authorization to discharge shall expire at midnight on February 28, 2016.
Signed this day
DRAFT
Charles Wakild,P.E., Director
Division of Water Quality
By Authority of the
Environmental Management Commission

• 1
NC0000361
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge
are hereby revoked, and as of this 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.
Unimin Corporat' `:.
Schoolhouse Qu•
is hereby authorized to:
1. Continue operation of a wastewater 'snr ,tment p1 t for pr ;;: wastewater from
mineral extraction consistin: of:
• Non-fluoride waste su >>>A A ith 3P
Pum s;
• 80 foot diameter thicke
• Overflow tanks;
• Disk filter,
• -•C; o,fi;;f::.,'•'.'.•':'.. ri�3�`%i�ai^:>;:.
Fluoride ���. to sum `'���`�;�'�>, ��..r.�.
sow-
• 60 foot ter th t,j, er' •
• Five dews` «.• • cycl s;
• Pan Filter;
P
o 220 .ice fla x units;'
wo 1280 g.11:1,. occ` •n units,`:
• :• 2500 squar `' ',.t 1. ar >•• flow plate separators;
• Li `h « urn, and :i.il :.mer a•- ition;
• Mixi tl :actor to
• Multime e :.filters<< >
• Filter press;<
• Emergency po` k
• Recycle system;and
• All associated piping, equipment, and controls
The facility is located at the Schoolhouse Quartz Facility, 107 Harris Mining
Company Road,Spruce Pine, Avery County,and;
2. Discharge treated wastewater through Outfall 001 from said treatment works at
the location specified on the attached map into the North Toe River,which is
classified C Trout waters, in the French Broad River Basin.

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Facility Information
i Facility
-
....,,,-.'i',:?!... . ..., •. .. - . , ,
„ ,o,..„- ,
Latitude: 3556' 20" Sub-Basin: 04-03-06 Location -
Longitude: 8159'45" HUC#: 06010108 ., ..
Quad#: Linville Falls (D11SW)
Stream Class: C Trout
I
ReceivinStream: North Toe River Unimin.-Schoolhouse Quartz Facility
North
NC000U361
ct '
: a ,
Permitted Flow: 2.16 MGD - .
___

NC0000361
A. (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS-DRAFT
During the period beginning on the effective date of the permit and lasting until
expiration, the Permittee is authorized to discharge process wastewater from mineral
extraction of ore from Outfall 001. Such discharges shall be limited and monitored by
the Permittee as specified below:
EFFLUENT
LIMITATIONS Monitoring Requirements
Effluent Monthly Daily Measurement SSam�le Sampler
CharacteristicsAverage Maximum Frequency Type Location
Flow 2.16 MGD °.... Y=>r ,;ous Recording I or E
Total Fluoride109.0 lb/day 218.0 h:>' ''' Wee�'c;t :<.- Composite E,U,D
Total Suspended 450.0 lb/day 721: ., day Weekly _ :'..mposite E,U,D
Solids
Settleable Solids ` >' 'kly E
Turbidity2 :�.. : >< >;`+eekly Gr ' E, U, D
pHs eekly Grab E, U, D
Chloride4 ";' S`r'i:: . rly Composite E
::::.:..• Composite E Toxici 5
e
Nots:
1. Sam le locations:'• _ ffluen ..:w:ii, InfluerCiP.: Kaolin Pumphouse, D-Franklintown
P
bridge. Instream s." ':;-s s.R -- • abs. ::,.ales and shall be conducted weekly.
:::n:;:vY h�T•y
gid.^n Y'Sil:i J�>ui. i?F
2. This • �R.;�,:>a.::>,��:��:r-<A.• 1 no`�'��i_:;;�k '�_��'�<: •i :::he receiving waters to exceed 10 NTU.
If d < ' ••s 11` .;,:. ,U due `•';'.'*.rt:':**
'•.r >. 'conditions, the discharge shall not
ca ''- ;; y increase`t� .. r bi• ':?y,• the rece ing stream. See Special Condition A. (7).
3. The p i ';all not be lek:',.:.,....:.: 7,.. .; an 6. as-,ndard units nor greater than 10.0 standard units.
4. Chloride*,. be monit , quar'',.-:.0 during the same months as toxicity testing.
5. Chronic To "?- 4 (Ceriod.:a. 'a)Pass/Fail at 10%: February, May,August and
November. Se= I. cial C':f>=}ition A (2).
There shall be no disch:'' , floating solids or visible foam in other than trace amounts.

•
NC0000361
A. (2).CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or
significant mortality to Ceriodaphnia dubia at an effluent concentration of 10.0%.
The permit holder shall perform at a minimum,quarterly monitoring using test
procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay
Procedure," Revised February 1998, or subsequent versio'•,.or"North Carolina Phase II
Chronic Whole Effluent Toxicity Test Procedure" (Rev' °ro 10'ebru 1998) or subsequent
versions. The tests will be performed during the m t.,14:11.t of February,May,August and
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November. Effluent sampling for this testing sh. := ,r t. ed at the NPDES
permitted final effluent discharge below all tr-,ma•.' t pros'
If the test procedure performed as the fi gargt of any single q '` r results in a
failure or ChV below the permit limit,the` . g ltiple-c s centratio' f vk�sting shall be
performed at a minimum,in each of the two''''`fig:+,wi n t•nths as dl'? r:s ed in"North
Carolina Phase II Chronic Who:ky: uent Toxriter Procedure" (R'':4 sed-February
1998) or subsequent versions.
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The chronic value for multiple cone' : tion i..., ' I be`< _-rmined using the
geometric mean of th?. ` 3 ;W�Ty ,concen ? :•n ha, : . r•;L a det-* :.;.=3le impairment of
reproduction or s arran•`` ;W;.lowest c•-e2 'o°` _ : ::•oes have a detectable
impairment of reps ' tion or ival. 120'finition o`'' 'detectable impairment,"
collection methods,ex' . re r-{ `:,es, and 't` r er statistical methods are specified in the
"North C. .._ 'a- '„s.ase I 4.4,16>'Y . .•Y;Effl ''14.11:11. Toxicity Test Procedure” (Revised-
Febru. :.9F:, • .•. Ue<:;bf::, '-.rsions '
All toxi A:" :sting result > uire3 , .art of this permit condition will be entered on the
Effluent Di`-4 e Monito `re e Form` -1) for the months in which tests were
performed. If "` '• pass '>' results using the parameter code TGP3B, DWQ Form
AT-1 (original) is'` w jt..to thew address. If reporting Chronic Value results using the
parameter code TH' E :: orm AT-3 (original) is to be sent to the following
address:
Attention: NC DENR/DWQ/Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences
Section no later than 30 days after the end of the reporting period for which the report is
made.

NC0000361
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 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 du 'x :: a month in which toxicity
monitoring is required, the permittee will completethmation located at the top of
the aquatic toxicity (AT) test form indicating the face; e .:•me,permit number, pipe
number, county,and the month/year of the repo k,;,ittrf otation of"No Flow" in the
comment area of the form. The report shall b-; � tted t Environmental Sciences
Section at the address cited above. •. •
Should the permittee fail to monitor during'eti .,, .nth in 'ch toxic' : : onitoring is
required, monitoring will be required during .•` •llor, `_<`month.
Should any test data from this ai.g in re uir=. - J r tests performer`':y the North
Carolina Division of Water Quali `fl-:<Y '"�#;„ ° :- potenti4i;,,.•acts to the receiving stream,
this permit may be.re-opened and i`° dude` ate monitoring
requirements or limits.
NOTE: Failure to ac►.:=:a t:.< :::: E ,. onditio '`_ -s the .`''d document, such as
minimum control sm sn >{:.val, • x z•ntr ti sm reproduction, and
appropriate enviro MAtal con s, shall ' ?' 'tute an invalid test and will require
immediate follow-up t'=y` R. to ~u' •. pleter�' ' later than the last day of the month
followin �;..,;;>�.:::.:�;x:;: ,, ofg•:��`
Shoul . i,, test data '' ` ;::his `"°= ;:;toting re s'+irement or tests performed by the North
Carolina"w k F.'sion of Wats uali '•v; +icate potential impacts to the receiving stream,
this permit ` :;;:be re-open d m ied to include alternate monitoring
requirements 'ts.
If the Permittee mo `. :;- - ;. •llutant more frequently than required by this permit, the
results of such monito 'Mgr 11 be included in the calculation and reporting of the data
submitted on the DMR an. all AT Forms submitted.
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.

NC0000361 .
A. (3). BIOCIDE CONDITION
The permittee shall obtain authorization from the Division of Water Quality 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 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 Quality. Such notification shall
include completion of Biocide Worksheet Form 101 and a;K,ap locating the discharge
point and receiving stream. No chromium, zinc, or co.410 all be added to the
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treatment system except as pre-approved additives R cidal compounds.
A. (4). WASTEWATER DIVERSION
Diversion or bypassing of untreated wast er from the trea Tw,acility is prohibited.
A.
A. (5). SOLIDS DISPOSAL
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Solids removed or resulting from t a a - er trea process shall be contained
and disposed of in such a manner as "_< Breve' rF%f;> cont.',c.m.tion of the surface waters
of
the State.
A. (6). FLUORIDE 't,-11 PENE
This pe � _ aza ,�mod i { ;, >_ xw, an.`'` .sued to incorporate new fluoride
efflue " o'' t> ' ,e ev: p;::> at ac c bioassay testing or other studies
result.t :;;. changein 'a` ort`"`Y ;oliva " "Quality Standard for fluoride.
A. (7). TU NF ITY
In the event that`<%fid tions o F turbidity standard of the North Carolina Water Quality
Standards occur as :.bult „` 's discharge, this permit shall be modified,or alternately,
revoked and reissued,$”:s c orate limitations sufficient to protect the receiving waters.
A. (8). PERMIT MODIFICATIONS
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.