NC0085839_Permit Modification_20081114

o f w a rF9 Michael F. Easley
�O� QG Governor
vj William G. Ross,Jr.,Secretary
North Carolina Department of Environment and Natural Resources
O r Coleen H.Sullins,Director
Division of Water Quality
November 14,2008
Mr.Jeffrey S. Ferguson,P.E.
Environmental Engineer
UNIMIN Corporation
136 Crystal Drive
Spruce Pine,North Carolina 28777
Subject: NPDES Permit Modification
Permit NCO085839
UNIMIN Corporation Red Hill Facility
Mitchell County
Dear Mr. Ferguson:
Division personnel have reviewed and approved your application for modification of the subject
permit. Accordingly,we are forwarding the attached NPDES discharge permit. This permit is issued
pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of
Agreement between North Carolina and the U.S. Environmental Protection Agency dated October 15,
2007 (or as subsequently amended).
The following changes from the draft previously sent to you for review are:
➢ Stormwater outfall 002 has been renamed to SD001. This is to resolve a problem with our
Basinwide Information Management System (BIMS) database,which creates erroneous error
messages when discharge data is not entered for Outfall 002. Renaming the outfall will not cause
any differences in the permit requirements for stormwater management:.
➢ The number of thickeners, drum filters and emergency ponds has been corrected.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you,you have the right to an adjudicatory hearing upon written request within thirty (30)
days following receipt of this letter. This request must be in the form of a written petition, conforming to
Chapter 150B of the North Carolina General Statutes,and filed with the Office of Administrative Hearings
(6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this
decision shall be final and binding.
N.C.Division of Water Quality/NPDES Unit Phone:[phone]
1617 Mail Service Center,Raleigh,NC 27699-1617 fax:[phone]
Internet:h2o.en r.state.nc.us DENR Customer Service Center.1 800 623-7748

Please note that this permit is not transferable except after notice to the Division. The Division 4
may require modification or revocation and reissuance of the permit. This permit does not affect the legal
requirements to obtain other permits which may be required by the Division of Water Quality or permits
required by the Division of Land Resources,the Coastal Area Management Act or any other Federal or
Local governmental permit that may be required. If you have any questions concerning this permit,please
contact Jim McKay at telephone number [phone].
Sincerely,
Cole n H. Sullins
cc: Central Files
NPDES Files
Asheville Regional Office—Surface Water Protection. Attachment:Fact Sheet
EPA Region 4. Attachment: Fact Sheet
USFWS/Tom Augspurger via email
l

Permit Number: NCO085839
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
Unimin Corporation
is hereby authorized to discharge wastewater from a facility located at
RedQuartz Plant
���OHighway 197
to 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, II, III and IV hereof.
This permit shall become effective December 1, 2008
This permit and authorization to discharge shall expire at midnight on February 28, 2011.
Signed this day November 14,2008
a, /-=
leen . Sullins, Director
Division of Water Quality
By Authority of the
Environmental Management Commission
1

Permit Number: NC0085839
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 Corporation
Red Hill Wastewater Treatment Plant
is hereby authorized to:
1. Continue to operate a wastewater treatment plant for process wastewater from mineral
extraction, located at Red Hill WWTP, consisting of.
• Mix-reactor tanks;
• Lime and polymer feed systems;
• Two thickeners;
^� • Two drum filters;
• pH adjustment;
• Two emergency ponds, and
• flow measurement.
The facility is located at the Red Hill Quartz facility, off Highway 197, Mitchell County,
and;
2. ter taining an Authorization tO-Construct from the�visign of W aier Quality-,lo
onstru anc�after submitting an Engineer's Certification;fo operate the facility at 2.0
GD.
3. Discharge wastewater through outfall 001s ghD001 from
said treatment works at the locations spec on the attached map into the North Toe
River, which is classified C Trout waters, in the French Broad River Basin.
2

- I� /` �-' � \ . ,���� �� _ ��' • ``'sem.
Outfall 001 (Process),and `` ;.40`
SDO01 (Stormwater)
'12
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UNIMIN Red Hill Facility - NCO085839 Facility
USGS Quad Name: C9 SE, Bakersville Lat.: 36000' 50" Location
Receiving Stream: North Toe River Long.: 82'16' 05"
Stream Class: C,Trout
Subbasin: French Broad-04-03-06 North Mitchell County

• Permit Number: NCO085839
A. (1).EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until
expiration, or expansion above 0.682 mgd flow capacity, 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 asspecified below:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
EFFLUENT Monthly Daily Measurement Sample Typ Sample
CHARACTERISTICS Average Maximum Frequency Locations
Flow 0.682 MGD Continuous Recording I or E
Total Fluoride 200.0 lb/day 400.0 lb/day Weekly Composite E, U, D
Total Suspended 142.0 lb/day 284.0 lb/day Weekly Composite E
Solids
N113-N Monthly Composite E
Total Residual 28 ug/1 Weekly Grab E
Chlorine
Settleable Solids Daily Grab E
Turbidity 3 Weekly Grab E, U, D
PH 4 Daily Grab E
Chloride Monthly Composite E
Chronic Toxicity 5 Quarterly Composite E
Notes:
1. Sample locations: E- Effluent, I- Influent, U-upstream at least 50 feet, D-
downstream at least 300 feet.
2. The total residual chlorine limit and monitoring requirements are only applicable if
facility uses chlorine or chlorine derivatives for disinfection. See Condition A. (3).
3. This discharge shall not cause the turbidity of the receiving waters to exceed 10
NTU. If the turbidity exceeds 10 NTU due to natural conditions, the discharge
shall not cause any increase in turbidity.
4. The pH shall not be less than 6.0 standard units nor greater than 10.0 standard
units.
S. Chronic Toxicity (Ceriodaphnia) Pass/Fail at 1.2%: January, April, July and
October. See Special Conditions A (4).
There shall be no discharge of floating solids or visible foam in other than trace
amounts.
3

0
Permit Number: NCO085839
A. (2). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on expansion above 0.682 mgd discharge capacity 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 speed below:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
EFFLUENT Monthly Weekly Daily Measurement Sample Sample
CHARACTERISTICS Average Average Maximum Freauency Type Location 1
Flow 2.0 MGD Continuous Recording I or E
Total Fluoride 384.0 lb/day 768.0 lb/day Weekly Composite E, U, D
Total Suspended 417.0 Weekly Composite E
Solids lb/day 834.0 lb/day
NH3-N Monthly Composite E
Total Residual 28 ug/1 Weekly Grab E
Chlorine 2
Settleable Solids Daily Grab E
Turbidity 3 Weekly Grab E, U, D
PH 4 Daily Grab E
Chloride Monthly Composite E
Chronic Toxicity S Quarterly Composite E
Notes:
1. Sample locations: E- Effluent, I- Influent, U-upstream at least 50 feet, D-
downstream at least 300 feet.
2. The total residual chlorine limit and monitoring requirements are only applicable if
facility uses chlorine or chlorine derivatives for disinfection. See Condition A. (3).
3. This discharge shall not cause the turbidity of the receiving waters to exceed 10
NTU. If the turbidity exceeds 10 NTU due to natural conditions, the discharge
shall not cause any increase in turbidity.
4. The pH shall not be less than 6.0 standard units nor greater than 10.0 standard
units.
5. Chronic Toxicity (Ceriodaphnia) Pass/Fail at 3.3%: January, April, July and
October. See Special Conditions A (5).
There shall be no discharge of floating solids or visible foam in other than trace
amounts.
4

Permit Number: NCO085839
A. (3). TOTAL RESIDUAL CHLORINE
The Division shall consider all effluent TRC values reported below 50 ug/L to be in
compliance with the permit. However, the Permittee shall continue to record and
submit all values reported by a North Carolina certified laboratory (including field
certified), even if these values fall below 50 ug/1. If a method different than
chlorination/dechlorination is used for disinfection, the total residual chlorine limit
will not be applicable.
A. (4). 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 1.2%.
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 versions or "North Carolina Phase
II Chronic Whole Effluent Toxicity Test Procedure" (Revised-February 1998) or
subsequent versions. The tests will be performed during the months of January,
April, July and October. Effluent sampling for this testing shall be performed at the
NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of 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 following months as described in "North
Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-February
1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the
geometric mean of the highest concentration having no detectable impairment of
reproduction or survival and the lowest concentration that does have a detectable
impairment of reproduction or survival. The definition of"detectable impairment,"
collection methods, exposure regimes, and further statistical methods are specified in
the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-
February 1998) or subsequent versions.
All toxicity testing results required as part of 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 THP3B for
the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the
following address:
Attention: North Carolina Division of Water Quality
Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences
Branch no later than 30 days after the end of the reporting period for which the report
is made.
5

Permit Number: NCO085839
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 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 Environmental
Sciences Branch 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.
Should any test data from this monitoring requirement or tests performed by the
North Carolina Division of Water Quality 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. (5). 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 3.3%.
The permit holder shall perform at a minimum, quarte rlt(monitoring using test
procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay
Procedure," Revised February 1998, or subsequent versions or"North Carolina Phase
II Chronic Whole Effluent Toxicity Test Procedure" (Revised-February 1998) or
subsequent versions. The tests will be performed during the months of January,
April, July and October. Effluent sampling for this testing shall be performed at the
NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of 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 following months as described in
"North Carolina Phase 11 Chronic Whole Effluent Toxicity Test Procedure"
(Revised-February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the
geometric mean of the highest concentration having no detectable impairment of
reproduction or survival and the lowest concentration that does have a detectable
impairment of reproduction or survival. The definition of"detectable impairment,"
collection methods, exposure regimes, and further statistical methods are speed in
the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-
February 1998) or subsequent versions.
All toxicity testing results required as part of 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 THP3B for
the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the
following address:
6

• Permit Number: NC0085839
Attention: North Carolina Division of Water Quality
Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences
Branch 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 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 Environmental
Sciences Branch 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.
Should any test data from this monitoring requirement or tests performed by the
North Carolina Division of Water Quality 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.
7

Permit Number: NCO085839
A. (6).BIOCIDE CONDITION ,
The permittee shall obtain authorization form 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 map locating the
discharge point and receiving stream. No chromium, zinc, or copper shall be added to
the treatment system except as pre-approved additives to biocidal compounds.
A. (7). WASTEWATER DIVERSION
Diversion or bypassing of untreated wastewater from the treatment facility is
prohibited.
A. (8). SOLIDS DISPOSAL
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. (9). FLUORIDE REOPENER
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. (10). TURBIDITY REOPENER
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
alternately, revoked and reissued to incorporate limitations sufficient to protect the
receiving waters.
A. (10). 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.
8

Permit Number: NCO085839
PART II
STORMWATER MONITORING, CONTROLS AND LIMITATIONS FOR PERMITTED
DISCHARGES
SECTION A. STORMWATER BEST MANAGEMENT PRACTICES (BMPS) PLAN
1. The permittee shall implement stormwater BMPs to ensure that contaminants do
not enter surface waters via stormwater that comes in contact with any unstabilized
overburden, raw materials, intermediate products, finished products, byproducts or
waste products located on the site covered by this permit. A BMP Plan shall be
developed in accordance with the requirements of this section. The BMP Plan
requirement, or portions of the plan requirement, may be met by utilizing appropriate
requirements in other documented plans specific to the permitted facility.
2. Management of Stormwater Runoff and Runon. The permittee shall maintain
stormwater BMPs for land disturbance areas and outside process areas. In addition,
controls should be used to limit or isolate selected land disturbance and process areas
and limit the amount of off site stormwater runon to those areas. Appropriate Best
Management Practices (BMPs) should be used to divert, infiltrate, reuse or otherwise
manage stormwater runoff and runon in a manner that reduces pollutants in
stormwater discharges leaving the site. Appropriate BMPs may include but are not
limited to: vegetative swales, berms, use of reclaimed mine areas, and reuse of
collected stormwater (such as for an industrial process or as an irrigation source).
3. BMP Controls Inspection and Maintenance. All stormwater BMPs shall be inspected
by or under the direction of the permittee at least once every seven calendar days and
within 24 hours after any storm event that results in a discharge. The BMPs
implemented shall be operated and maintained so that they are cleaned out when the
sediment storage capacity has been reduced by 50%. If any visible sedimentation is
leaving the property, corrective action shall be taken to reduce the discharge of
sediments. Visible sedimentation found offsite shall be recorded with a brief
explanation as to the measures taken to prevent future releases as well as any
measures taken to remove the sediment that left the site. All other stormwater specific
controls (e.g. oil /water separators) shall be inspected and qualitatively monitored on a
semiannual schedule, once during the first half of the year (January-June) and once
during the second half of the year (July - December), with at least 60 days separating
inspection dates (unless performed more frequently). A log of sampling data and of
activities taken to implement BMPs associated with the vehicle maintenance activities
shall be maintained and incorporated into the BMP Plan and kept onsite for the
duration of the permit term and made available to the Director upon request.
9

Permit Number: NC0085839
4. Erosion and Sedimentation Control. The permittee shall implement the
management practices and the erosion and sedimentation control measures that are
included in the mining permit or erosion and sedimentation control permit issued by
the Division of Land Resources. Compliance with the issued permit is considered a
requirement of this permit. Any deviation from the issued permit, or amendments to
the issued permit that impacts water quality shall constitute a violation of the terms
and conditions of this permit. A signed copy of the issued permit including the
approved erosion and sedimentation control measures and the reclamation plan shall
be maintained on the site at all times. Once an area is released by the Division of Land
Resources in accordance with NCGS Chapter 74, Article 7, it shall no longer be
subject to this permit.
5. Preventive Maintenance Inspections and Good Housekeeping Practices. Equipment
utilized during mining activity on a site must be operated and maintained in such a
manner as to prevent potential or actual pollution of the surface water or ground
waters of the state. Fuels, lubricants, coolants, and hydraulic fluids, or any other
petroleum products, shall not be discharged on the ground or into surface waters.
Spent fluids shall be disposed of in a manner so as not to enter the surface waters or
ground waters of the state and in accordance with applicable federal disposal
regulations. Any spilled fluids shall be cleaned up to the maximum extent practicable
and disposed of in a manner that does not allow their entry into the surface waters or
ground waters of the state.
6. Secondary Containment. The permittee shall provide secondary containment for
bulk storage of liquid materials, storage of Section 313 of Title III of the Superfund
Amendments and Reauthorization Act (SARA) water priority chemicals, or storage of
hazardous liquids substances to prevent leaks and spills from contaminating
stormwater runoff. If the secondary containment devices are connected directly to
stormwater conveyance systems, the connection shall be controlled by manually
activated valves or other similar devices (which shall be secured with a locking
mechanism) and any stormwater that accumulates in the containment area shall be at
a minimum visually observed for color, foam, outfall staining, visible sheens and dry
weather flow, prior to release of the accumulated stormwater. Accumulated
stormwater shall be released if found to be uncontaminated by the material stored
within the containment area.
SECTION B: ANALYTICAL AND QUALITATIVE MONITORING REQUIREMENTS
FOR DISCHARGES COMPOSED ENTIRELY OF STORMWATER
Analytical monitoring for stormwater discharges shall be performed for parameters as
specified in Tables 1 through 2. All analytical monitoring shall be performed during a
representative storm event as defined in Section D. Definitions.
In situations where stormwater runoff is controlled by some type basin or
retention/detention pond, the following provisions are applicable for sample collection
for analytical monitoring:
Analytical monitoring for stormwater discharges from a basin or other similar control
structures must be performed within the first 30 minutes of discharge.
10

Permit Number: NCO085839
• Analytical monitoring for a basin /pond designed to contain the 10-year design
storm (see Section D. Definitions) without discharging is not required. Qualitative
monitoring for color, foam, outfall staining,visible sheen and dry weather flow is the
only monitoring requirement.
• Analytical and qualitative monitoring are not required for a basin/pond designed to
contain the 25-year, 24-hour storm (see Section D. Definitions) without discharging. A
basin/ pond meeting this provision is considered a non-discharging stormwater
control.
1. Analytical Monitoring for Stormwater Discharges from Land Disturbance and
Process Areas.
Analytical monitoring for stormwater discharges from land disturbance and process
areas shall be performed as specified in Table 1.
Table 1. Analytical Monitoring Requirements for Stormwater Discharges from
Land Disturbing Activities and Process Areas
Discharge Units Measurement Sample Sample
Characteristics Frequency 1 Type 2 Location 3
Settleable Solids ml/L Semi-Annually Grab SDO
Total Suspended Solids m Semi-Annually Grab SDO
Turbidity NTU Semi-Annually Grab SDO
Total Rainfall 4 inches Semi-Annually -- --
pH SU Semi-Annually Grab SDO
Fluoride In Semi-Annually Grab SDO
Chloride m Semi-Annuall Grab I SDO
Footnotes:
1 Measurement Frequency: Twice per year during a representative storm event. A year is
defined as the 12 month period beginning on the month and day of issuance of the permit.
2 The sample is collected within the first 30 minutes of discharge from the outfall.
3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO)
unless representative outfall status has been granted.
4 For each sampled representative storm event, the total precipitation must be recorded. An
on-site or local rain gauge reading must be recorded.
The permittee shall report the analytical results from the first sample with valid results within
the monitoring period. The permittee shall compare monitoring results to the benchmark
values in Table 2. The benchmark values in Table 2 are not permit limits but should be used
as guidelines for the permittee's Best Management Practices (BMPs) Plan. Exceedences of
benchmark values require the permittee to increase monitoring, increase management actions,
increase record keeping, and/or install stormwater Best Management Practices (BMPs) in a
tiered program. See below the descriptions of Tier One and Tier Two.
11

Permit Number: NC0085839
Table 2. Benchmark Values for Analytical Monitoring
Discharge Characteristics Units Benchmark
Settleable Solids ml/L 0.1
Total Suspended Solids m 100
Turbidity NTU 10
e.=
If: The first valid sampling results are above a benchmark value, or outside the
benchmark range, for any parameter at any outfall;
Then:The permittee shall:
1. Conduct a stormwater management inspection of the facility within two
weeks of receiving sampling results.
2. Identify and evaluate possible causes of the benchmark value exceedence.
3. Identify potential, and select the specific: source controls, operational controls,
or physical improvements to reduce concentrations of the parameters of
concern, or to bring concentrations to within the benchmark range.
4. Implement the selected actions within two months of the inspection.
S. Maintain records for each instance of a Tier One response in the facility's Best
Management Practices Plan. Include the date and value of the benchmark
exceedence, the inspection date, the personnel conducting the inspection, the
selected actions, and the date the selected actions were implemented.
"Tie o
If: During the term of this permit, the first valid sampling results are above the
benchmark values, or outside of the benchmark range, for any specific parameter at a
specific discharge outfall two times in a row (consecutive);
Then:The permittee shall:
1. Repeat all the required actions outlined above in Tier One.
2. Immediately institute monthly monitoring for all parameters at every outfall
where a sampling result exceeded the benchmark value for two consecutive
samples. Monthly (analytical and qualitative) monitoring shall continue until
three consecutive sample results are below the benchmark values, or within
the benchmark range, for all parameters at that outfall.
3. If no discharge occurs during the sampling period, the permittee is required to
submit a monthly monitoring report indicating"No Flow".
4. Maintain a record of the Tier Two response in the facility's Best Management
Practices Plan.
12

Permit Number: NCO085839
During the term of this permit, if the valid sampling results required for the permit
monitoring periods exceed the benchmark value, or are outside the benchmark range,
for any specific parameter at any specific outfall on more than four occasions, the
permittee shall notify the DWQ Regional Office Supervisor in writing within 30 days
of receipt of the fourth analytical results. DWQ may, but is not limited to:
• Require that the permittee increase or decrease the monitoring frequency for
the remainder of the permit;
• Require the permittee to install structural stormwater controls;
• Require the permittee to implement other stormwater control measures; or
• Require that the permittee implement site modifications to qualigy for the No
Exposure Exclusion.
2. Qualitative Monitoring Requirements
Qualitative monitoring requires a visual inspection of each stormwater outfall
regardless of representative outfall status and shall be performed as specified in Table
3, during the analytical monitoring event. (If analytical monitoring is not required, the
permittee still must conduct semi-annual qualitative monitoring.) Qualitative
monitoring is for the purpose of evaluating the effectiveness of the Stormwater Best
Management Practices Plan (BMPs) and assessing new sources of stormwater
pollution.
In the event an atypical condition is noted at a stormwater discharge outfall, the
permittee shall document the suspected caulse of the condition and any actions taken
in response to the discovery. This documentation will be maintained with the
Facilities BMPs Plan.
13

Permit Number: NCO095839
Table 3. Qualitative Monitoring Requirements .
Discharge Characteristics Frequency Monitoring
LOM ionl
color Semi-Annual SDO
Odor Semi Annual SDO
Clarify Semi-Annual SDO
Floating Solids Semi-Anmud SDO
Suspended Solids Semi-Annual SDO
Foam Semi-Anmu d SDO
Oil Sheen Semi Annual SDO
Deposition at or immediately below the Semi-Annual SDO
outfall
Erosion at or immediately below the Semi-Annual SDO
outfall
Other obvious indicators Semi-Annual SDO
of stormwater pollution
Footnotes:
1 Measurement Frequency: Twice per year during a representatiave storm event, for each year
until either another permit is issued for this facility or until this permit is revoked or rescinded.
If at the end of this permitting cycle the permittee has submitted the appropriate paperwork for
a renewal permit before the submittal deadline, the permittee will be considered for a renewal
application. The applicant must continue semi-annual monitoring until the renewed permit is
issued.
2 Monitoring Location: Qualitative monitoring shall be performed at each stormwater discharge
outfall (SDO) regardless of representative outfall status.
SECTION C: SCHEDULE OF COMPLIANCE
1. The permittee shall comply with Final Limitations and Controls specified for
stormwater discharges in accordance with the following schedule:
For the land disturbance activities:
a. Implement BMP's and stormwater controls, as appropriate on the effective
date of permit coverage, at existing operations.
b. Develop and implement BMP's and stormwater controls, as appropriate, prior
to beginning land disturbance activity at new operations.
14

Permit Number: NC0085839
2. Permittee shall at all times provide the operation and maintenance necessary to
operate the permitted stormwater controls at optimum efficiency.
SECTION D: DEFIMTIONS
1. Representative Storm Event
A storm event that measures greater than 0.1 inches of rainfall and that is preceded
by at least 72 hours in which no storm event measuring greater than 0.1 inches has
occurred. A single storm event may contain up to 10 consecutive hours of no
precipitation. For example, if it rains for 2 hours without producing any collectable
discharge, and then stops, a sample may be collected if a rain producing a discharge
begins again within the next 10 hours.
2. Ten Year Design Storm
The maximum 24 hour precipitation event expected to be equaled or exceeded on
the average once in ten years. Design storm information can be found in the State
of North Carolina Erosion and Sediment Control Planning and Design Manual.
3. 25-year, 24 hour storm event
The maximum 24-hour precipitation event expected to be equaled or exceeded, on
the average, once in 25 years.
15

Permit Number: NCO085839 ,
SECTION E: REPORTING REQUIREMENTS
1. Discharge Monitoring Reports
Samples analyzed in accordance with the terms of this permit shall be submitted
to the Division on Discharge Monitoring Report (DMR) forms provided by the
Director. Submittals shall be delivered to the Division no later than 30 days from
the date the facility receives the sampling results from the laboratory.
When no discharge has occurred from the facility during the report period, the
permittee is required to submit a discharge monitoring report within 30 days of
the end of the six-month sampling period, giving all required information and
indicating"No Flow" as per NCAC T15A 02B.0506.
The permittee shall record the required qualitative monitoring observations on the SDO
Qualitative Monitoring Report (QMR) form provided by the Division, and shall retain the
completed forms on site. Qualitative monitoring results should not be submitted to the
Division, except upon DWQ's specific requirement to do so. QMR forms may be found on
the Stormwater web site at: http://h2o.enr.state.nc.us/su/documents/SWU-
2420ualitativeMonitoringForm2008.pdf
2. Submitting Reports
Duplicate signed copies of all reports required herein, shall be submitted to the following
address:
Division of Water Quality
Surface Water Protection Section
Attention: Central Files
1617 Mail Service Center
Raleigh, NC 27699-1617
16

Unimin draft permit modification,NCO085839
Subject: Unimin draft permit modification,NCO085839
From: [e-mail]
Date: Fri,3 Oct 2008 08:51:26-0400
To: [e-mail]
my only thought is that the fact sheet should have a summary of the
antidegradation analysis that should have been conducted to support the
increased loadings. The fact sheet needs to include NC's determination
that this lowering of water quality (increased loading) is necessary to
accommodate important economic or social development in the area in
which the receiving water is located, per 40 CFR Part 131.12(a) (2) .
Let me know if you have any questions.
Because EPA's current review is based on the discharge of pollutants of
concern to a 303(d) listed waterbody, which does not involve this
facility, this email constitutes EPA's no comment on this draft
modification.
1 of 1 10/3/2008 9:00 AM

Page 1
LEXSTAT 40 CFR 131.12
LEXISNEXIS'CODE OF FEDERAL REGULATIONS
Copyright®2008,by Matthew Bender&Company,a member
of the LexisNexis Group.All rights reserved.
***THIS SECTION IS CURRENT THROUGH THE JUNE 12,2008 ISSUE OF***
***THE FEDERAL REGISTER***
TITLE 40—PROTECTION OF ENVIRONMENT
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER D--WATER PROGRAMS
PART 131 —WATER QUALITY STANDARDS
SUBPART B—ESTABLISHMENT OF WATER QUALITY STANDARDS
Go to the CFR Archive Directory
40 CFR 131.12
§ 131.12 Antidegradation policy.
(a)The State shall develop and adopt a statewide antidegradation policy and identify the methods for implementing
such policy pursuant to this subpart.The antidegradation policy and implementation methods shall,at a minimum,be
consistent with the following:
(1)Existing instream water uses and the level of water quality necessary to protect the existing uses shall be
maintained and protected.
(2)Where the quality of the waters exceed levels necessary to support propagation of fish,shellfish,and wildlife
and recreation in and on the water,that quality shall be maintained and protected unless the State finds,after full
satisfaction of the intergovernmental coordination and public participation provisions of the State's continuing planning
process,that allowing lower water quality is necessary to accommodate important economic or social development in
the area in which the waters are located.In allowing such degradation or lower water quality,the State shall assure
water quality adequate to protect existing uses fully.Further,the State shall assure that there shall be achieved the
highest statutory and regulatory requirements for all new and existing point sources and all cost-effective and
reasonable best management practices for nonpoint source control.
(3)Where high quality waters constitute an outstanding National resource,such as waters of National and State
parks and wildlife refuges and waters of exceptional recreational or ecological significance,that water quality shall be
maintained and protected.
(4)In those cases where potential water quality impairment associated with a thermal discharge is involved,the
antidegradation policy and implementing method shall be consistent with section 316 of the Act.
HISTORY:48 FR 51405,Nov.8, 1983.
AUTHORITY:33 U.S.0 1251 et seq.

Page 2
40 CFR 131.12 '
NOTES:NOTES APPLICABLE TO ENTIRE CHAPTER:
[PUBLISHER'S NOTE:Nomenclature changes to Chapter I appear at 65 FR 47323,47324,47325,Aug.2,2000.]
[PUBLISHER'S NOTE:For Federal Register citations concerning Chapter 1 Notice of implementation policy,see: 71
FR 25504,May 1,2006.1
NOTES TO DECISIONS:COURT AND ADMINISTRATIVE DECISIONS SIGNIFICANTLY DISCUSSING
SECTION—
Ky. Waterways Alliance v Johnson(2006, WD Ky)426 F Supp 2d 612
296 words

ASHEYm .T E
CMZEN T N ES
VOICE OF THE MOUNTAINS•CITMEN-TTMES.com
AFFIDAVIT OF PUBLICATION
BUNCOMBE COUNTY
SS.
NORTH CAROLINA
Before the undersigned, a Notary Public of said
County and State, duly commissioned, qualified and
PUBLIC NOTICE authorized b law to administer oaths,personally
STATE OF NORTH CAROLINA Y 1� Y
ENVIRONMENTAL
UNIT ENT appeared Janis Pierce,who,being first duly sworn,
1617 MAIL SERVICE CENTER
RALEIGH,NC 21699-1617 deposes and says: that she is the Legal Billing
NOTIFICATION OF INTENT TO ISSUE A
NPDES WASTEWATER PERMIT -Times,Clerk of The Asheville Citizenengaged in
cations of NC of.thorough
Statute review.i and 1511 publication of a newspaper known as The Asheville
NCAC 02H.0109 and other lawful standards anc
the North Carolina Environmennts Citizen-Times,published, issued, and entered as
regulations, the
Management Commission proposes to issue
National Pollutant Discharge Elimination Sys first class mail in the City of Asheville, in said
tem (NPDES) wastewater discharge permit tic
the Person(s) listed below effective as days frorrCounty and State; that she is authorized to make
the publish dare of this notice. �
Written comments regarding the proposed per this affidavit and sworn statement; that the notice or
mit will be accepted until 30 days after the Pub.
Iish date of this notice. All comments received other legal advertisement, a true copy of which is
Prior to that date are considered in the final de-
terminations regarding the proposed permit attached hereto was published in The Asheville
The Director of the NC Division of Water Quality
May decide to hold a public meeting for the pro-
posed permit, should the Division receive o sig Citizen-Times on the following date: September
nificant degree of public Interest.
Copies of the draft permit and other supporti 25, 2008. And that the said newspaper in which said
information on file used to determine condition notice paper, document or legal advertisement was
Present in the draft permit are available upon r > >
quest
and comments eand/orirequests of
infodrmafin published was, at the time of each and every
to the NC Division of Water Quality at the abo
address or call Dina Sprinkle [phone] at t publication, a newspaper meeting all of the
Point Source Branch. Please include the NPDE
Permit number (below) in any communication requirements and qualifications of Section 1-597 of
Interested persons may also visit The Division o
leighr NCa27604--114at 81 be weenlithe hours of 8:a the General Statues of North Cazollna and was a
a.m.and 5:00 P.m.to review information on file. qualified newspaper within the meaning of Section
NPDES Permit Number NC0085839, Unimin Cor
Poration - Red Hill Quartz Plant, has applied fo ec 1-597 of the General Statues of North Carolina.modification of its permit to increase Permitt
flow to 2.0 MGD from 0.682 MGD for a facili
discharging treated wastewater to the North T
River in the French Broad River Basin.
Currently fluoride is water quality limited. Thi Signed this 25th day of September, 2008
discharge may affect future allocations in thi
portion of the receiving stream. i
September
2S,
S 2008 5101
(Signatu person makin a idavit)
Sworn to and subscribed before me the 25`h day of
September, 2008
tell 8 6
(No ublic)
My Commission expires the 6th day of October,
2011
[phone] 1 [phone] FAX
14 0. HENRY AVE. I P.O.BOX 2090 1 ASHEVILLE,NC 28802 1 [phone]
CAI GANNETT

Re:Unimin Red Hill approval
• Subject: Re: Unimin Red Hill approval
From: [e-mail]
Date:Fri,29 Aug 2008 10:52:56-0400
To: James Mckay<[e-mail]>
CC: Susan Wilson<[e-mail]>,[e-mail],[e-mail],
[e-mail]
Jim, further to our discussion, past emails/discussions and meetings, we
need to address your proposed limitations as quickly as possible. First,
during past meetings with the State and all of our correspondence, we have
explained that this application is for a facility expansion - - doubling
our capacity - - and the need for additional fluoride effluent allowable.
All of our correspondence has indicated that DWQ will allow an increase in
the allowable monthly average fluoride based on the 95th percentile of the
past two years in-stream concentration. The draft permit proposed by you
contains a fluoride reduction rather than the increase we have been
discussing.
The approach taken with the draft permit is a major change from how the
State has determined fluoride limitations in the past. Previously, the
State has determined all of the Spruce Pine facilities' monthly average
limitations based on the 7g10 flow to meet the in-stream limit of 1.8 mg/1.
In the current application process, we have gone well below the 7g10 flow
by agreeing to utilize the background in-stream concentration. This is
more conservative than using the normal guidelines of 7g10 flow to set the
monthly average limitation.
But now at the 11th hour, rather than deriving the monthly average
limitation as discussed, indicated and expected, to meet the 1.8 mg/l
limit, you have set this as our maximum daily allowable. This is wholly
inconsistent with past determinations and practice by the State and at odds
with all of the discussions about this particular permit 'revision (e.g.
need for increased limitations and issues with selling those increased
limits to EPA) .
We understand that DWQ will not send anything to Public Notice until we can
discuss this issue because the reduced permit limits you have now proposed
very likely mean an end to our multi-million dollar expansion project and
the jobs it would have entailed. Please contact Susan so that we may
discuss this issue as soon as possible. Additionally, as you have
indicated that Susan is leaving DWQ rather soon, we will need to discuss
this matter with her supervisor or whom she may currently report to.
Again, thank you for refraining from submitting your draft version of the
permit as these limitations are not what we have been discussing for the
past 6 months.
Thank you,
Jeff
James Mckay
<James.McKay@ncma
il.net> To
[e-mail]
08/25/2008 02:24 cc
PM Ken Pohlig <[e-mail]>
Fax to
Subject
Re: Unimin Red Hill approval
1 of 2 8/29/2008 11:39 AM

Re:Unimin Red Hill approval
Jeff,
Attached is the draft modified permit for the Red Hill plant. It should
go out by Wednesday for publication. You should get a hard copy soon.
Please review it and send any questions or comments to me. I am also
emailing a copy to CG&L.
Ken,
The draft permit modification for Unimin Corporation's Red Hill plant is
attached. They are planning to expand to increase production, and will
be sending plans to CG&L for review. Please contact me (807-6404) if
you have any questions.
Jim McKay
[e-mail] wrote:
Hi Jim, I wanted to thank you again for all of your work on this and help I
expediting issuance to notice. I forgot to ask you what Fluoride limit
you
Ihave determined based on the past 2 years data (removing the let year
data
to remove the Grubb Test per my discussion with Susan) . Based on my
calculations, the 95th percentile background of 2 years data should allow
around 354 lbs/day rather than 386 lbs/day I initially requested. Also,
what TSS limit will be imposed, the 450 lb/day I initially requested or
do
Iyou need to back off on this as well? Please let me know. Dont forget
to
Icopy me on the email of the draft to the ATC guys. Thanks again and I i
look
foward to draft issuance.
Jeff
(See attached file: 85839draft08.pdf) (See attached file: James McKay.vcf)
Content-Type: application/pdf
85839draftO8.pdf I
Content-Encoding: base64
Content-Type: application/octet-stream''I
James_McKay.vcf I
Content-Encoding: base64
2 of 2 8/29/2008 11:39 AM

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NCO085839
Facility Information -
Applicant/Facility Name: Unimin Corporation-Red Hill Quartz Plant
Applicant Address: P.O.Box 588,Hwy 226N Spruce Pine NC 28777
Facility Address: Highway 197N Bakersville NC 28705
Permitted Flow 2.0 mgd
Type of Waste: Industrial
Facility/Permit Status: Modification
Facility Classification Physical/Chemical Class II
County: Mitchell
Miscellaneous
Receiving Stream: North Toe River Regional Office: Asheville
Stream Classification: C Trout USGS To o Quad: C9SE
303(d) Listed?: No Permit Writer: Jim McKay
Subbasin: 04-03-06 Date: 9/15/2008
Drainage Area mit : 340
Summer 7Q10 cfs 90.7
Winter 7Q10 (cfs): 125.6
Average Flow cfs : 510
IWC (%): 3.3%
Primary SIC Code: 1499
SUMMARY OF FACILITY INFORMATION AND WASTELOAD ALLOCATION
Unimin Corporation is requesting a permit modification for its Red Hill Quartz Plant to increase
flow to 2.0 mgd from it's currently permitted flow of 0.682 mgd in order to increase production.
The Red Hill Quartz Plant performs extraction and mineral processing to produce high purity
quartz. No mining is done at this site. The facility is permitted to discharge into the North Toe
River, class C-Trout waters, in French Broad River Basin. Outfall 001 discharges process
water. Outfall 002 is an intermittent stormwater discharge.
The wastewater treatment plant consists of:
• Mix-reactor tanks;
• Lime and polymer feed systems;
• 2 thickeners;
• 2 drum filters
• pH adjustment;
• flow measurement and,
• 2 emergency ponds.
Processes for treatment include neutralization, precipitation, settling, vacuum filtering of solids
and disposal of solids by land filling.
RECEIVING STREAM INFORMATION:
The North Toe River downstream of the facility has a bioclassification rating of Good.
According to the US Fish and Wildlife office, that stretch of North Toe River is designated
critical habitat for the federally endangered Appalachian elktoe. We have records of the
federally endangered Alasmidonta raveneliana (Appalachian elktoe), the state listed Lampsilis
fasciola (Wavy rayed lamp mussel), and Etheostoma acuticeps (Sharphead darter) listed as a
federal species of concern all occuring in that reach of the North Toe.
A section of the North Toe River upstream of this facility is listed on North Carolina's 2006-
303(d) list, based on turbidity and riparian area loss. This upstream segment has a
bioclassification rating of Fair. The Red Hill Quartz Plant is located approximately 15 miles
downstream of the impaired segment of the North Toe River.
Unimin Corporation—Red Hill Facility Fact Sheet
NPDES Modification NCO085839
Pave 1

At this time, DWQ proposes no changes to the previously developed load allocations. Neither
the impairment nor the turbidity violation is directly attributable to this downstream discharge.
Likely, the upstream discharges will be re-evaluated in the future.
INSTREAM MONITORING:
Upstream: Upstream at least 50 feet
Downstream: Downstream at least 300 feet.
Parameters: Fluoride, Turbidity, pH
The fluoride instream standard of 1.8 mg/ L was exceeded both upstream and downstream of
the discharge in 2005, with 7 instances of upstream exceedance in 2005, none in 2006,none in
2007 and none through March 2008.
A review of instream data for 2005 through March 2008 showed no exceedances of the
turbidity standard of 10 NTU for trout streams.
Per Unimin, the cause of the exceedances upstream are unknown. It is speculated that some
quality control problems with upstream discharges occurred and caused sporadic exceedances
of Total Fluoride. Extreme drought conditions could have also been a contributing factor.
Because of the sporadic upstream exceedances, the Division of Water Quality used the 95th
percentile of the previous 2 years of upstream data for fluoride to calculate the upstream value
for use in calculating the allowable fluoride limit (See explanation under proposed changes).
TOXICITY TEST RESULTS:
Existing: Quarterly Chronic P/F, 1.2% Ceriodaphnia test. JAN APR JUL OCT
Facility has passed all tests since January 2002 except for one failure in January 2004. It was
followed by,two passed tests in Feb. and March 2004 and all subsequent tests through July
2007.
Recommendation: Renewal of quarterly chronic test @ 3.3% based on increased flow.
COMPLIANCE REVIEW:
The facility has been in compliance with nearly all permit limits consistently in 2005, 2006
2007 and 2008 YTD. One NOV was issued in November 2006 for exceeding the TSS Limit and
one NOV in 2007 for exceeding the flow limit.
Unimin is no longer required to conduct the Priority Pollutant analysis based on category of
discharger.
Chlorine is added for disinfection of the intake water. A TRC limit of 28 ug/L was added on
permit renewal in November, 2006 based on trout classification of receiving stream and NC
standard for TRC. An 18 month compliance schedule was given, the TRC limit began June 1,
2008. The TRC limit will continue with this permit modification.
PROPOSED CHANGES:
At the request of the permittee, flow is increased to 2.0 MGD from 0.682 MGD. TSS
concentration limits were kept the same at 25 mg/ L, based on 40 CFR 436 for similar type
operations. The new mass limit is 417 Ib/ day monthly average for TSS, and 834.0 lb/ day
daily max.
Unimin Corporation—Red Hill Facility Fact Sheet
NPDGS Modification NCO085839
Page 2

i
The new fluoride limit is based on the NC WQ Standard of 1.8 mg/L. Instream data for April
2006, 2007 through March 2008 was reviewed. A background upstream fluoride concentration
of 1.07 mg/L was calculated based on the 95Th percentile of the data range. A standard
material balance limit calculation results in an allowable discharge concentration of 23 mg/L,
or 384.0 pounds per day,which is given as a weekly average based on the chronic WQ
standard. A daily maximum limit of two times the weekly average (768.0 lb/day) has been given
based on discussion with Marshall Hyatt of EPA Region 4, Jeff Ferguson of Unimin, and their
attorney, Steve Levitas. The existing fluoride limit is 200.0 pounds per day monthly average
and 400.0 pounds per day daily maximum at a flow of 0.682 MGD. These limits were based on
BPJ of Best Available Control Technology of 27 mg/L when the permit was first issued.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE:
Draft Permit to Public Notice: 9/24/2008
Permit Scheduled to Issue: (Tentative) 11/10/2008
Projected Effective Date of Permit: 12/01/2008
STATE CONTACT:
If you have any questions on any of the above information or on the attached permit, please
contact Jim McKay at [phone].
NAME: fil e 6tg DATE: '7—
Ar -
REGIONAL OFFICE COMMENT:
NAME: DATE:
REGIONAL SUPERVISOR:
NAME: DATE:
Unimin Corporation—Red Hill Facility Fact Sheet
NPDES Modification NCO085839
Page 3

NPDES SUPERVISOR COMMENPr:
NAME: DATE:
I
Unimin Corporation—Red Hill Facility Fact Sheet
NPDES Modification NCOG95839
Page 4

Unimin Red Hill
Upstream
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Dalhere<.2=0.1
Su NTU m L mg/l
4-Apr 2006 7.45 4 0.21 0.21
7-Apr 2006 7.84 1 0.42 0.42
10-Apr 2006 7.41 7 1.10 1.10
11-Apr 2006 7.24 2 0.84 0.84
19-Apr 2006 7.20 18 1.21 1.21
21-Apr 2006 7.17 8 0.94 0.94
25-Apr 2006 7.31 4 0.78 0.78
28-Apr 2006 7.16 6 0.37 0.37
2-May 2006 7.22 4 <0.2 0.10
4-May 2006 7.23 3 <0.2 0.10
9-May 2006 7.37 2 0.23 0.23
11-May 2006 7.25 2 0.22 0.22
15-May 2006 7.50 2 <0.2 0.10
17-May 2006 7.44 2 <0.2 0.10
22-May 2006 7.52 5 <0.2 0.10
23-May 2006 7.05 2 <0.2 0.10
30-May 2006 7.46 3 0.36 0.36
31-May 2006 8.02 3 0.38 0.38
3-Jul 2006 7.98 3 0.54 0.54
4-Jul 2006 7.14 5 0.54 0.54
11-Jul 2006 7.79 2 0.24 0.24
13-Jul 2006 7.81 2 0.22 0.22
18-Jul 2006 7.42 2 0.21 0.21
21-Jul 2006 7.27 2 <0.2 0.10
24-Jul 2006 7.87 3 0.31 0.31
27-Jul 2006 7.54 2
2-Aug 2006 8.12 1 0.54 0.54
4-Aug 2006 7.88 1 0.52 0.52
8-Aug 2006 7.97 2 0.44 0.44
10-Aug 2006 7.43 1 0.98 0.98
14-Aug 2006 7.38 6 0.34 0.34
15-Aug 2006 7.25 6 0.28 0.28
17-Aug 2006 7.51 2 0.77 0.77
20-Aug 2006 6.68 9 0.56 0.56
23-Aug 2006 7.37 2 0.61 0.61
24-Aug 2006 7.25 2 0.54 0.54
29-Aug 2006 7.98 1 0.41 0.41
30-Aug 2006 8.20 1 0.30 0.30
1-Sep 2006 6.02 19 <0.2 0.10
6-Sep 2006 7.30 13 0.20 0.20
7-Sep 2006 6.81 4 0.29 0.29
14-Sep 2006 7.08 9 0.22 0.22
J

15-Sep 2006 7.37 3 0.26 0.26
18-Sep 2006 7.99 1 0.38 0.38
19-Sep 2006 7.92 1 0.55 0.55
27-Sep 2006 8.66 1 0.58 0.58
29-Sep 2006 7.44 2 0.62 0.62
3-Oct 2006 7.62 2 0.69 0.69
6-Oct 2006 7.37 1 0.72 0.72
11-Oct 2006 7.09 1 0.54 0.54
12-Oct 2006 7.26 1 0.36 0.36
16-Oct 2006 7.38 1 0.63 0.63
17-Oct 2006 7.05 9 0.63 0.63
19-Oct 2006 7.21 2 0.36 0.36
24-Oct 2006 7.09 1 0.33 0.33
25-Oct 2006 7.17 1 0.68 0.68
31-Oct 2006 7.37 1 0.29 0.29
1-Nov 2006 7.29 2 0.48 0.48
6-Nov 2006 6.84 1 0.32 0.32
7-Nov 2006 7.17 1 0.31 0.31
9-Nov 2006 6.98 8 0.23 0.23
14-Nov 2006 7.18 5 0.20 0.20
16-Nov 2006 6.84 30 0.26 0.26
22-Nov 2006 6.95 1 0.34 0.34
23-Nov 2006 7.01 1 0.36 0.36
27-Nov 2006 6.97 1 0.27 0.27
28-Nov 2006 6.88 1 0.26 0.26
30-Nov 2006 7.24 2 0.38 0.38
6-Dec 2006 7.23 1 0.51 0.51
8-Dec 2006 6.84 1 0.43 0.43
13-Dec 2006 7.32 2 1.11 1.11
14-Dec 2006 7.27 3 1.34 1.34
18-Dec 2006 7.40 1 0.48 0.48
19-Dec 2006 7.41 1 0.33 0.33
22-Dec 2006 7.28 1 0.57 0.57
26-Dec 2006 7.20 5 <0.2 0.10
28-Dec 2006 7.18 2 0.24 0.24
2-Jan 2007 6.94 6 <0.2 0.10
3-Jan 2007 6.88 4 0.20 0.20
11-Jan 2007 6.80 2 0.26 0.26
12-Jan 2007 6.94 2 0.28 0.28
16-Jan 2007 7.44 2 0.29 0.29
18-Jan 2007 7.16 1 0.37 0.37
23-Jan 2007 7.12 2 0.24 0.24
26-Jan 2007 7.10 1 0.29 0.29
30-Jan 2007 7.10 1 0.26 0.26
2-Feb 2007 7.08 1 0.44 0.44
6-Feb 2007 7.11 1 0.49 0.49
8-Feb 2007 6.72 1 0.47 0.47
13-Feb 2007 7.18 1 0.33 0.33
15-Feb 2007 6.90 1 0.44 0.44
19-Feb 2007 6.89 1 0.48 0.48
22-Feb 2007 6.84 2 0.50 0.50
27-Feb 2007 7.81 2 0.43 0.43

• 28-Feb 2007 7.52 1 0.40 0.40
2-Mar 2007 6.91 18 0.21 0.21
6-Mar 2007 7.18 1 0.31 0.31
8-Mar 2007 7.33 2 0.44 0.44
13-Mar 2007 7.80 1 0.21 0.21
15-Mar 2007 7.87 1 0.26 0.26
20-Mar 2007 7.28 1 <0.2 0.10
22-Mar 2007 7.91 1 0.26 0.26
27-Mar 2007 8.31 3 <0.2 0.10
30-Mar 2007 7.76 3 0.24 0.24
2-Apr 2007 7.80 2 0.49 0.49
3-Apr 2007 7.14 2 0.68 0.68
10-Apr 2007 7.68 1 0.49 0.49
12-Apr 2007 7.53 1 0.64 0.64
18-Apr 2007 7.25 1 0.68 0.68
19-Apr 2007 7.28 2 0.39 0.39
23-Apr 2007 6.97 1 0.64 0.64
24-Apr 2007 6.78 1 0.74 0.74
30-Apr 2007 7.39 1 <0.2 <0.2
2-May 2007 7.56 1 0.53 0.53
8-May 2007 7.50 1 0.19 0.19
10-May 2007 7.67 2 0.51 0.51
14-May 2007 7.49 1 0.34 0.34
14-May 2007 7.37 1 0.31 0.31
17-May 2007 7.36 2 0.63 0.63
22-May 2007 7.82 3 0.35 0.35
24-May 2007 7.21 2 0.41 0.41
29-May 2007 7.14 2 0.37 0.37
31-May 2007 7.59 2 0.65 0.65
4-Jun 2007 7.11 4 0.35 0.35
5-Jun 2007 7.32 2 0.41 0.41
14-Jun 2007 7.31 3 0.60 0.60
15-Jun 2007 7.28 3 0.37 0.37
18-Jun 2007 7.56 3 <0.2 0.10
22-Jun 2007 7.73 4 0.35 0.35
27-Jun 2007 7.09 12 0.89 0.89
28-Jun 2007 7.59 4 0.45 0.45
5-Jul 2007 7.32 3 1.40 1.40
6-Jul 2007 7.96 3 0.70 0.70
10-Jul 2007 7.82 4 0.40 0.40
13-Jul 2007 8.08 2 0.60 0.60
16-Jul 2007 7.05 2 1.10 1.10
17-Jul 2007 8.18 2 0.88 0.88
25-Jul 2007 6.80 38 0.63 0.63
26-Jul 2007 7.01 26 0.86 0.86
31-Jul 2007 7.12 5 0.76 0.76
2-Aug 2007 6.17 21 0.28 0.28
6-Aug 2007 7.87 4 0.57 0.57
10-Aug 2007 7.61 4 0.56 0.56
14-Aug 2007 8.18 3 1.05 1.05
17-Aug 2007 7.77 3 1.33 1.33
21-Aug 2007 6.84 2 1.35 1.35

23-Aug 2007 6.61 3 1.07 1.07
27-Aug 2007 7.50 4 1.02 1.02
28-Aug 2007 7.51 2 0.50 0.50
30-Aug 2007 8.04 2 1.17 1.17
4-Sep 2007 8.08 2 0.74 0.74
6-Sep 2007 7.80 1 0.61 0.61
9-Sep 2007 8.09 2 0.52 0.52
13-Sep 2007 7.87 1 0.54 0.54
18-Sep 2007 7.88 1 0.64 0.64
21-Sep 2007 8.53 1 0.62 0.62
22-Sep 2007 8.74 1 0.27 0.27
23-Sep 2007 8.10 1 0.36 0.36
25-Sep 2007 8.51 1 0.60 0.60
2-Oct 2007 8.72 1 0.57 0.57
4-Oct 2007 8.70 1 0.38 0.38
8-Oct 2007 8.30 2 0.45 0.45
9-Oct 2007 8.30 2 0.45 0.45
11-Oct 2007 8.37 1 0.41 0.41
16-Oct 2007 8.48 1 1.14 1.14
18-Oct 2007 8.17 1 0.80 0.80
23-Oct 2007 7.27 2 0.53 0.53
25-Oct 2007 7.06 1 0.46 0.46
29-Oct 2007 7.75 1 0.28 0.28
30-Oct 2007 7.82 1 0.68 0.68
1-Nov 2007 7.74 1 0.98 0.98
5-Nov 2007 7.56 1 0.87 0.87
10-Nov 2007 7.63 1 0.76 0.76
12-Nov 2007 7.43 1 0.92 0.92
15-Nov 2007 7.47 1 0.82 0.82
19-Nov 2007 7.86 1 1.07 1.07
22-Nov 2007 7.41 1 0.71 0.71
28-Nov 2007 7.38 1 0.45 0:45
30-Nov 2007 7.38 1 0.61 0.61
5-Dec 2007 7.80 1 0.84 0.84
7-Dec 2007 7.79 1 0.44 0.44
10-Dec 2007 7.85 1 0.42 0.42
11-Dec 2007 7.85 1 0.46 0.46
18-Dec 2007 7.64 1 0.27 0.27
21-Dec 2007 7.67 1 0.42 0.42
26-Dec 2007 7.43 1 0.28 0.28
28-Dec 2007 7.58 1 0.24 0.24
31-Dec 2007 7.51 10 0.32 0.32
3-Jan 2008 7.70 2 0.76 0.76
9-Jan 2008 7.54 2 0.81 0.81
11-Jan 2008 7.51 2 0.68 0.68
15-Jan 2008 7.72 3 0.36 0.36
18-Jan 2008 7.67 1 0.76 0.76
23-Jan 2008 7.67 2 0.24 0.24
26-Jan 2008 7.89 1 0.67 0.67
29-Jan 2008 7.28 1 0.34 0.34
5-Feb 2008 7.57 30 0.43 0.43
7-Feb 2008 7.48 10 0.20 0.20

• 11-Feb 2008 7.48 1 0.21 0.21
12-Feb 2008 7.48 1 0.25 0.25
20-Feb 2008 7.42 4 0.20 0.20
22-Feb 2008 7.15 3 0.24 0.24
26-Feb 2008 7.08 2 0.20 0.20
28-Feb 2008 7.46 3 0.25 0.25
3-Mar 2008 7.36 1 0.21 0.21
6-Mar 2008 7.41 1 0.23 0.23
11-Mar 2008 7.37 3 0.20 0.20
13-Mar 2008 7.68 2 0.20 0.20
19-Mar 2008 7.83 3 0.20 0.20
24-Mar 2008 7.53 2 0.20 0.20
25-Mar 2008 7.73 1 0.20 0.20
30-Mar 2008 7.81 2 0.54 0.54
1.07 95th percentile=
0.48 Average=

NCO085839-UNIMIN Red Hill Facility Instream Monitoring Data
North Toe River
2006-March 2008 Data, Modified by using 0.1 where<0.2 is reported
Jim McKay 8/11/2008 Upstream
50 ft upstream of discharge
Date Year pH Turbidity Fluoride
SU NTU mg/L
2-Mar 2006 7.78 1 0.34
6-Mar 2006 7.42 1 0.37
7-Mar 2006 7.42 2 0.29
13-Mar 2006 8.26 1 0.36
14-Mar 2006 7.94 3 0.21
21-Mar 2006 7.33 16 0.25
22-Mar 2006 7.23 5 0.20
27-Mar 2006 7.55 2 0.10
28-Mar 2006 7.65 1 0.32
4-Apr 2006 7.45 4 0.21
7-Apr 2006 7.84 1 0.42
10-Apr 2006 7.41 7 1.10
11-Apr 2006 7.24 2 0.84
19-Apr 2006 7.20 18 1.21
21-Apr 2006 7.17 8 0.94
25-Apr 2006 7.31 4 0.78
28-Apr 2006 7.16 6 0.37
2-May 2006 7.22 4 0.10
4-May 2006 7.23 3 0.10
9-May 2006 7.37 2 0.23
11-May 2006 7.25 2 0.22
15-May 2006 7.50 2 0.10
17-May 2006 7.44 2 0.10
22-May 2006 7.52 5 0.10
23-May 2006 7.05 2 0.10
30-May 2006 7.46 3 0.36
31-May 2006 8.02 3 0.38
3-Jul 2006 7.98 3 0.54
4-Jul 2006 7.14 5 0.54
11-Jul 2006 7.79 2 0.24
13-Jul 2006 7.81 2 0.22
18-Jul 2006 7.42 2 0.21
21-Jul 2006 7.27 2 0.10
24-Jul 2006 7.87 3 0.31
27-Jul 2006 7.54 2
2-Aug 2006 8.12 1 0.54
4-Aug 2006 7.88 1 0.52
8-Aug 2006 7.97 2 0.44
10-Aug 2006 7.43 1 0.98
14-Aug 2006 7.38 6 0.34
15-Aug 2006 7.25 6 0.28
17-Aug 2006 7.51 2 0.77
20-Aug 2006 6.68 9 0.56
23-Aug 2006 7.37 2 0.61
24-Aug 2006 7.25 2 0.54
29-Aug 2006 7.98 1 0.41
30-Aug 2006 8.20 1 0.30
1-Sep 2006 6.02 19 0.10
6-Sep 2006 7.30 13 0.20

7-Sep 2006 6.81 4 0.29 .
14-Sep 2006 7.08 9 0.22
15-Sep 2006 7.37 3 0.26
18-Sep 2006 7.99 1 0.38
19-Sep 2006 7.92 1 0.55
27-Sep 2006 8.66 1 0.58
29-Sep 2006 7.44 2 0.62
3-Oct 2006 7.62 2 0.69
6-Oct 2006 7.37 1 0.72
11-Oct 2006 7.09 1 0.54
12-Oct 2006 7.26 1 0.36
16-Oct 2006 7.38 1 0.63
17-Oct 2006 7.05 9 0.63
19-Oct 2006 7.21 2 0.36
24-Oct 2006 7.09 1 0.33
25-Oct 2006 7.17 1 0.68
31-Oct 2006 7.37 1 0.29
1-Nov 2006 7.29 2 0.48
6-Nov 2006 6.84 1 0.32
7-Nov 2006 7.17 1 0.31
9-Nov 2006 6.98 8 0.23
14-Nov 2006 7.18 5 0.20
16-Nov 2006 6.84 30 0.26
22-Nov 2006 6.95 1 0.34
23-Nov 2006 7.01 1 0.36
27-Nov 2006 6.97 1 0.27
28-Nov 2006 6.88 1 0.26
30-Nov 2006 7.24 2 0.38
6-Dec 2006 7.23 1 0.51
8-Dec 2006 6.84 1 0.43
13-Dec 2006 7.32 2 1.11
14-Dec 2006 7.27 3 1.34
18-Dec 2006 7.40 1 0.48
19-Dec 2006 7.41 1 0.33
22-Dec 2006 7.28 1 0.57
26-Dec 2006 7.20 5 0.10
28-Dec 2006 7.18 2 0.24
2-Jan 2007 6.94 6 0.10
3-Jan 2007 6.88 4 0.20
11-Jan 2007 6.80 2 0.26
12-Jan 2007 6.94 2 0.28
16-Jan 2007 7.44 2 0.29
18-Jan 2007 7.16 1 0.37
23-Jan 2007 7.12 2 0.24
26-Jan 2007 7.10 1 0.29
30-Jan 2007 7.10 1 0.26
2-Feb 2007 7.08 1 0.44
6-Feb 2007 7.11 1 0.49
8-Feb 2007 6.72 1 0.47
13-Feb 2007 7.18 1 0.33
15-Feb 2007 6.90 1 0.44
19-Feb 2007 6.89 1 0.48
22-Feb 2007 6.84 2 0.50
27-Feb 2007 7.81 2 0.43
28-Feb 2007 7.52 1 0.40
2-Mar 2007 6.91 18 0.21
6-Mar 2007 7.18 1 0.31
8-Mar 2007 7.33 2 0.44

13-Mar 2007 7.80 1 0.21
15-Mar 2007 7.87 1 0.26
20-Mar 2007 7.28 1 0.10
22-Mar 2007 7.91 1 0.26
27-Mar 2007 8.31 3 0.10
30-Mar 2007 7.76 3 0.24
2-Apr 2007 7.80 2 0.49
3-Apr 2007 7.14 2 0.68
10-Apr 2007 7.68 1 0.49
12-Apr 2007 7.53 1 0.64
18-Apr 2007 7.25 1 0.68
19-Apr 2007 7.28 2 0.39
23-Apr 2007 6.97 1 0.64
24-Apr 2007 6.78 1 0.74
30-Apr 2007 7.39 1 0.10
2-May 2007 7.56 1 0.53
8-May 2007 7.50 1 0.19
10-May 2007 7.67 2 0.51
14-May 2007 7.49 1 0.34
14-May 2007 7.37 1 0.31
17-May 2007 7.36 2 0.63
22-May 2007 7.82 3 0.35
24-May 2007 7.21 2 0.41
29-May 2007 7.14 2 0.37
31-May 2007 7.59 2 0.65
4-Jun 2007 7.11 4 0.35
5-Jun 2007 7.32 2 0.41
14-Jun 2007 7.31 3 0.60
15-Jun 2007 7.28 3 0.37
18-Jun 2007 7.56 3 0.10
22-Jun 2007 7.73 4 ' 0.35
27-Jun 2007 7.09 12 0.89
28-Jun 2007 7.59 4 0.45
5-Jul 2007 7.32 3 1.40
6-Jul 2007 7.96 3 0.70
10-Jul 2007 7.82 4 0.40
13-Jul 2007 8.08 2 0.60
16-Jul 2007 7.05 2 1.10
17-Jul 2007 8.18 2 0.88
25-Jul 2007 6.80 38 0.63
26-Jul 2007 7.01 26 0.86
31-Jul 2007 7.12 5 0.76
2-Aug 2007 6.17 21 0.28
6-Aug 2007 7.87 4 0.57
10-Aug 2007 7.61 4 0.56
14-Aug 2007 8.18 3 1.05
17-Aug 2007 7.77 3 1.33
21-Aug 2007 6.84 2 1.35
23-Aug 2007 6.61 3 1.07
27-Aug 2007 7.50 4 1.02
28-Aug 2007 7.51 2 0.50
30-Aug 2007 8.04 2 1.17
4-Sep 2007 8.08 2 0.74
6-Sep 2007 7.80 1 0.61
9-Sep 2007 8.09 2 0.52
13-Sep 2007 7.87 1 0.54
18-Sep 2007 7.88 1 0.64
21-Sep 2007 8.53 1 0.62

22-Sep 2007 8.74 1 0.27
23-Sep 2007 8.10 1 0.36
25-Sep 2007 8.51 1 0.60
2-Oct 2007 8.72 1 0.57
4-Oct 2007 8.70 1 0.38
8-Oct 2007 8.30 2 0.45
9-Oct 2007 8.30 2 0.45
11-Oct 2007 8.37 1 0.41
16-Oct 2007 8.48 1 1.14
18-Oct 2007 8.17 1 0.80
23-Oct 2007 7.27 2 0.53
25-Oct 2007 7.06 1 0.46
29-Oct 2007 7.75 1 0.28
30-Oct 2007 7.82 1 0.68
1-Nov 2007 7.74 1 0.98
5-Nov 2007 7.56 1 0.87
10-Nov 2007 7.63 1 0.76
12-Nov 2007 7.43 1 0.92
15-Nov 2007 7.47 1 0.82
19-Nov 2007 7.86 1 1.07
22-Nov 2007 7.41 1 0.71
28-Nov 2007 7.38 1 0.45
30-Nov 2007 7.38 1 0.61
5-Dec 2007 7.80 1 0.84
7-Dec 2007 7.79 1 0.44
10-Dec 2007 7.85 1 0.42
11-Dec 2007 7.85 1 0.46
18-Dec 2007 7.64 1 0.27
21-Dec 2007 7.67 1 0.42
26-Dec 2007 7.43 1 0.28
28-Dec 2007 7.58 1 0.24
31-Dec 2007 7.51 10 0.32
3-Jan 2008 7.70 2 0.76
9-Jan 2008 7.54 2 0.81
11-Jan 2008 7.51 2 0.68
15-Jan 2008 7.72 3 0.36
18-Jan 2008 7.67 1 0.76
23-Jan 2008 7.67 2 0.24
26-Jan 2008 7.89 1 0.67
29-Jan 2008 7.28 1 0.34
5-Feb 2008 7.57 30 0.43
7-Feb 2008 7.48 10 0.10
11-Feb 2008 7.48 1 0.21
12-Feb 2008 7.48 1 0.25
20-Feb 2008 7.42 4 0.10
22-Feb 2008 7.15 3 0.24
26-Feb 2008 7.08 2 0.10
28-Feb 2008 7.46 3 0.25
3-Mar 2008 7.36 1 0.21
6-Mar 2008 7.41 1 0.23
11-Mar 2008 7.37 3 0.10
13-Mar 2008 7.68 2 0.10
19-Mar 2008 7.83 3 0.10
24-Mar 2008 7.53 2 0.10
25-Mar 2008 7.73 1 0.10
30-Mar 2008 7.81 2 0.54
95'th Percentile: 10 1.07

Average: 0.47
Median: 0.41
P.
IC
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. - •i!-:}�,[y{_ Vit.•N_, ,
t
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.. ,..��- a..:.r�,.;ed.l��,�rr�a,_,ti_�- -.•.riii..•4,.1�.+� `,ii�...-_ ., ---�. .��s.lb��,�.Y -

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c�L• 3 + ce 4:. 3 . 1 = 16 7. 6 2,nay . 6. 34 - 2-3
cek = 23 1.E TF T� = 3S+ *lam

Re:Revised draft of Unimin Red Hill permit modification
Subject: Re: Revised draft of Unimin Red Hill permit modification
From:James Mckay<[e-mail]>
Date: Thu, 18 Sep 2008 13:28:37-0400
To: "Levitas, Steve" <[e-mail]>
CC: [e-mail],[e-mail],[e-mail], [e-mail]
I will make these changes and notice the permit on the 241th. Thank you for your
help in getting all issues resolved.
Jim McKay
Levitas, Steve wrote:
Jim -- This draft permit is acceptable to Unimin with a couple of minor
corrections. In the description of the WWTP in paragraph 1 on page 2 of
the permit, "thickener, " "drum filter, " and "emergency pond" should all
be plural to reflect the fact that all of these facility components are
present in duplicate. Thanks again for you help. We will look for the
permit to go to notice next seek. Steve
-----Original Message-----
From: James Mckay [mailto:[e-mail]] Sent: Monday, September 15, 2008
4:02 PM
To: [e-mail]
Cc: Levitas, Steve; [e-mail]
Subject: Revised draft of Unimin Red Hill permit modification
Jeff:
Attached is a revised copy of the subject draft permit. Please review
it thoroughly and send me any comments. The draft has been revised from
the •,revs nna n nY ��11 to ��- y aver ge nd a mal Ig max
This draft is subject to revision due to EPA
reviews and possibly from public comments and/ or public hearing if one
is held. I have discussed these changes verbally with Mr. Marshall
Hyatt of EPA Region 4 and he has agreed with them, so I do not expect
any problems from EPA review.
If there are no changes required, the draft should go to public notice
on Wednesday, September 24, and will be noticed in local newspapers. If
there are no adverse comments, the permit should issue in November with
an effective date of December 1, 2008. If adverse public comments are
received during the notice period, the Director of DWQ may call a public
hearing, which could add significant delay to the permit issuance.
Best regards,
Jim McKay
Environmental Engineer
Eastern NPDES Program
Jim McKay<James.McKaynancmail.net>
Environmental Engineer
Eastern NPDES Program
NC Division of Water Quality
1 of 1 9/18/2008 1:29 PM

Re:Unimin Red Hill approval
Subject: Re: Unimin Red Hill approval
From: Susan Wilson<[e-mail]>
Date: Sun, 31 Aug 2008 15:20:10-0400
To: "Levitas, Steve" <[e-mail]>
CC: [e-mail],[e-mail],[e-mail],Roger Edwards
<[e-mail]>, James McKay<[e-mail]>
I do not think we are far apart with Unimin. Here are the calcs for the mass balance-diagramatically for
ease of perusal. Also-calculation of the 95th percentile for the upstream data. Feel free to double
check us on those values-they are what Jeff sent over I believe. We transformed the<.2 mg/1 values to
0.1 mg/l(thafs fairly standard practice and what we would do if we were analyzing effluent data instead
of instream data).
Levitas, Steve wrote:
Susan -- If I misunderstood your prior message, I apologize. It sounds like we
may not be so far apart. The reason I wanted to get together is to be sure we all
have the same information and assumptions in front of us and can do our best to
sort it out. If we need to help in negotiations with EPA we are happy to do so.
Talk to you soon. Steve
----- Original Message -----
From: Susan Wilson <[e-mail]>
To: Levitas, Steve
Cc: [e-mail] <BShaltereunimin.com>; dbradleygunimin.com
<[e-mail]>; Chuck.Wakildoncmail.net <[e-mail]>
Sent: Sun Aug 31 11:23:17 2008
Subject: Re: Unimin Red Hill approval
Like I indicated in my previous e-mail - we do not want to implement the monthly
average value of 200 #/day and we believe that to be inappropriate (and an error) .
However - we have to argue that with EPA as they are in disagreement with us on
that (and we'll be happy to make that argument) . Unimin should likely focus not
on that monthly average value (which hopefully will be gone) , and should instead
focus on the daily maximum value (which we may be able to offer as a weekly
average, as I stated previously) . It's a standard mass balance calculation (I'll
send it over or Jim will - although likley Bill S can figure it out himself) -
only instead of a "zero" upstream concentration for total fluoride _ there is the
95th percentile value for total fluoride used for the upstream concentration (I
believe it came out around 1.07 mg/1) . I have no idea where you would have gotten
the idea that an NC water quality standard should be based on a monthly average.
For protection of
toxicity - they are either based on daily maximum values or weekly average values.
And the other argument we will have to make with EPA is implementing that value as
a load limit instead of a concentration based limit.
Levitas, Steve wrote:
Susan -- In the interest of trying to advance this time-sensitive
discussion, it would be helpful if you could provide us with DWQ's calculation
worksheets as soon as possible. It is certainly my understanding and experience
that North Carolina's in-stream water quality standards were developed based on
chronic toxicity values and are thus used to derive monthly or perhaps in some
cases weekly averages, not daily maxes. In any case, we need to understand how
the monthly average of 200 was developed as you had to have used some very
different input than Unimin, but I don't know what that was. Thanks for your
help. Steve
1 of 7 9/2/2008 8:35 AM

Re:Unimin Red Hill approval
----- Original Message -----
From: [e-mail] <[e-mail]>
<mailto:[e-mail]>
To: Susan Wilson <[e-mail]>
<mailto:[e-mail]>
Sent: Sat Aug 30 13:22:41 2008
Subject: Re: Unimin Red Hill approval
The limit for total fluoride would be based on the water quality standard
of 1.8 mg/l (which is implemented traditionally as a daily maximum,
Susan
We disagree
The 1.8 mg/l traditionally has been implemented as the daily average not
the daily maximum which is the point of our contention
The Current Total Daily Flouride limits
Toe River @ 7Q10 lbs of lbs of
flow F- allowable F- permitted
Spruce Pine 38cfs 574 574 lbs/daily avg
1148lbs/daily max (The total of the 5 current NPDES permits)
Red Hill 90.7cfs 1370 200 lbs/daily avg
400 lbs/ daily max ( the current Red Hill permit)
Bill Shalter
815-431-2216
4000 Baker Rd
Ottawa, I1 61350
Susan Wilson
<susan.a.wilson@n
cmail.net> <mailto:[e-mail]>
To
[e-mail]
08/29/2008 02:56
cc
PM James Mckay
<[e-mail]>
<mailto:[e-mail]> ,
[e-mail],
[e-mail],
[e-mail],
Paul Rawls <[e-mail]>
<mailto:[e-mail]> ,
Tom Belnick
<[e-mail]>
<mailto:[e-mail]> Chuck
Wakild <[e-mail]>
<mailto:[e-mail]>
Fax
2 of 7 9/2/2008 8:35 AM

Re:Unimin Red Hill approval
to
Subject
Re: Unimin Red Hill approval
Jeff -
I'm afraid that you have had a serious misunderstanding (and, of course,
we'd be happy to discuss it with you) . Never, in any e-mails or
discussions or meetings, did we give a definitive idea of what limits
Unimin would ultimately have upon expansion. Our job is to review the
data
we have (and the data Unimin presents to us) to determine limits that will
protect the NC water quality standards. Your previous permit limits for
total fluoride were based on treatability (both monthly average and daily
maximum) . With this over 2-fold expansion request - that would no longer
be the case (and never did I indicated that Unimin's limits for fluoride
would increase with an expansion) . The limit for total fluoride would be
based on the water quality standard of 1.8 mg/l (which is implemented
traditionally as a daily maximum, although we may be able to offer the
flexibility of a weekly average based on this chronic standard) . As we
discussed in our meeting in February - there were significant "hits"
upstream for total fluoride. At that time - we wanted to make Unimin
aware
of this so that the data could be investigated. We also gave Unimin the
option to statistically look at that data again. We told you/Unimin that
we could likely use the 95th percentile of the upstream data to calculate
the allowable level for fluoride (unless there were laboratory errors - we
could not "throw out" Unimin's own upstream data that they had certified
as
accurate with each monthly DMR submittal) .
The value of 384 lbs/day, daily max is based on the above described
evaluation (after your submittal of your analysis in July - Jim and I
discussed it and made the determination to use the most recent 2 years of
upstream values - which provided Unimin some lee-way for the "allowable"
total fluoride level) .
Right now - our EPA contact is insisting on a monthly average value (and
this is what he told Jim) . I feel this is an error on their part and
we're
going to argue quite a bit with them about this. However - in no way do I
feel there is any error on the daily maximum fluoride value (apparently
you
were assuming this would be implemented as a monthly average and that was
a
very wrong assumption) .
I understand that Levitas has contacted Chuck Wakild for a meeting - and
3 of 7 9/2/2008 8:35 AM

Re:Unin in Red Hill approval
that's fine - best to discuss these things in person.
We'll certainly hold off on public notice as long as you folks want us to.
As I stated in e-mails to you previously - I do not know of the comments
we may receive upon public notice (although I know that ARO has received
complaints on the Toe River) . It is always a risk to design a treatment
system before receiving a final permit.
[e-mail] wrote:
Jim, further to our discussion, past emails/discussions and
meetings,
we
need to address your proposed limitations as quickly as possible.
First,
during past meetings with the State and all of our correspondence,
we
have
explained that this application is for a facility expansion - -
doubling
our capacity - - and the need for additional fluoride effluent
allowable.
All of our correspondence has indicated that DWQ will allow an
increase in
the allowable monthly average fluoride based on the 95th percentile
of the
past two years in-stream concentration. The draft permit proposed
by
you
contains a fluoride reduction rather than the increase we have been
discussing.
The approach taken with the draft permit is a major change from how
the
State has determined fluoride limitations in the past. Previously,
the
State has determined all of the Spruce Pine facilities, monthly
average
limitations based on the 7g10 flow to meet the in-stream limit of
1.8
mg/1.
In the current application process, we have gone well below the 7g10
flow
by agreeing to utilize the background in-stream concentration. This
is
more conservative than using the normal guidelines of 7g10 flow to
set the
monthly average limitation.
But now at the 11th hour, rather than deriving the monthly average
limitation as discussed, indicated and expected, to meet the 1.8
mg/l
limit, you have set this as our maximum daily allowable. This is
wholly
inconsistent with past determinations and practice by the State and
at odds
with all of the discussions about this particular permit revision
(e.g.
need for increased limitations and issues with selling those
increased
limits to EPA) .
We understand that DWQ will not send anything to Public Notice until
we can
discuss this issue because the reduced permit limits you have now
proposed
very likely mean an end to our multi-million dollar expansion
4 of 7 9/2/2008 8:35 AM

Re:Unimin Red Hill approval
project
• and
the jobs it would have entailed. Please contact Susan so that we
may
discuss this issue as soon as possible. Additionally, as you have
indicated that Susan is leaving DWQ rather soon, we will need to
discuss
this matter with her supervisor or whom she may currently report to.
Again, thank you for refraining from submitting your draft version
of
the
permit as these limitations are not what we have been discussing for
the
past 6 months.
Thank you,
Jeff
James Mckay
<James.McKay@ncma
il.net> <mailto:[e-mail]>
To
[e-mail]
08/25/2008 02:24
cc
PM Ken Pohlig
<[e-mail]> <mailto:[e-mail]>
Fax to
Subject
Re: Unimin Red Hill approval
Jeff,
Attached is the draft modified permit for the Red Hill plant. It
should
go out by Wednesday for publication. You should get a hard copy
soon.
Please review it and send any questions or comments to me. I am
also
emailing a copy to CG&L.
Ken,
The draft permit modification for Unimin Corporation's Red Hill
plant
is
attached. They are planning to expand to increase production, and
5 of 7 9/2/2008 8:35 AM

Re:Unimin Red Hill approval
will
be sending plans to CG&L for review. Please contact me (807-6404)
if
you have any questions.
Jim McKay
[e-mail] wrote:
Hi Jim, I wanted to thank you again for all of your work on
this and help
expediting issuance to notice. I forgot to ask you what
Fluoride limit
you
have determined based on the past 2 years data (removing the
1st year
data
to remove the Grubb Test per my discussion with Susan) . Based
on my
calculations, the 95th percentile background of 2 years data
should allow
around 354 lbs/day rather than 386 lbs/day I initially
requested. Also,
what TSS limit will be imposed, the 450 lb/day I initially
requested or
do
you need to back off on this as well? Please let me know.
Dont forget
to
copy me on the email of the draft to the ATC guys. Thanks
again and I
look
foward to draft issuance.
Jeff
(See attached file: 85839draft08.pdf) (See attached file:
James_McKay.vcf)
Susan A. Wilson, P.E.
1617 Mail Service Center
Raleigh, NC 27699-1617
(919) 807 - 6389
6 of 7 9/2/2008 8:35 AM

Re:Unimin Red Hill approval
Susan A. Wilson, P.E.
1617 Mail Service Center
Raleigh, NC 27699-1617
(919) 807 -6389
Content-Type: application/pdf
i�Unimin TF calc scan 48-31-2008 pdf
� Content-Encoding: base64 �
Content-Type: application/vnd.ms-excel
'Unimin Red Hill-2 yrs UpstreanLxls
Content-Encoding: base64
7 of 7 9/2/2008 8:35 AM

Unimin
Emironmental Affairs Department
Unimin Corporation
136 Crystal Drive 9 Spruce Pine,NC 28777
(PHONE)828/766-6081•(FAQ 828/765-4755 1 "
Ay 7, 2008
Ms. Susan Wilson, Supervisor _
Western NPDES Program
NCDENR/Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Subject: Additional Information for NPDES Modification
Unimin Corporation —Red Hill Facility
NPDES Permit Nos. NC0085839, Mitchell County, North Carolina
Dear Ms. Wilson:
Pursuant to our meeting in the Asheville Regional Office on February 19, 2008,
please note the following in an effort to alleviate EPA's concern of increased fluorides in the
N. Toe River. As discussed in our meeting, we agreed that DWQ would utilize the 95"
percentile of the Red Hill upstream concentrations to establish a background fluoride
concentration in the river and the Red Hill allowable effluent could be increased based on
this established background. Please find attached upstream dataset with obvious outliers
that occurred in May,June,July and Oct. of 2005 highlighted in blue. Please note that no
outliers occurred during the last quarter of 2007 when all of North Carolina was under
extreme drought conditions.
An internal statistician has analyzed the data and utilized Grubb's test to remove the
outliers in question (please see attached). Finally, please find attached dataset where the
outliers have been removed, all "<0.2" where changed to "0.2" so that excel would
recognize the data to calculate the 95"' percentile. Utilizing this 95`h percentile as the
background concentration in the river, I have calculated the allowable levels of fluorides in
the Red Hill effluent to remain below the in-stream concentration limit of 1.8 mg/1. Based
on these calculations (attached) the Red Hill NPDES permit should reflect a monthly
average fluoride limit of 386 lbs/day. This is well below the best available control
technology at 27 mg/1 and the requested levels are sufficient to protect water quality.
As this project is extremely urgent, I am grateful for all efforts you can make to
expedite your review and submit final approval of the NPDES permit.

Ms. Susan Wilson
July 7,2008
Page 2
If you have any questions regarding this matter, require fiirther information, or
anyway I can assist to accelerate the modification approval please do not hesitate to contact
me at(828) 766-6081 ext. 13. Thank you very much for your help with this matter.
Sincerely,
91P
effrey S. Ferguson,P. E.
Environmental Engineer
UNIMIN CORPORATION
c: EA Files,Karl Kuchta(cover),Mike Jussila,Bruce Perkins

Utilizing the Grubb's Test on the raw data allows for 7 highest points to be removed. The table below lists the data point, sample
date, associated t and p values. A p-value less than 0.05 indicates the data point is likely an outlier and can be removed.
Sample Studentized Value Studentized Value
Value Date Without Deletion Without Deletion P-Value
4.27 07/18/05 7.787 8.683 0.000
4.16 07/13/05 8.429 9.603 0.000
3.54 06/03/05 7.982 8.961 0.000
3.04 10/13/05 7.498 8.298 0.000
2.25 10/21/05 5.747 6.090 0.000
2.16 10/18/08 2.783 6.134 0.000
1.83 05/24/05 4.945 5.162 0.000
----- - - -- - -------------------------------------- --- ------------------------
1.4 07/05/07 3.549 3.630 0.105
I've also included a couple of plots below. The 1 st shows the data after the 7 suspect points have been removed with relation to
the "new" mean and std dev. The second is a box-and-whisker plot with all points included. Note the same seven points are also
identified as "extreme" outliers by this method (utilizes median and percentiles -less likely to be influenced by potential outliers).
outlier Plot with Sigma Limits
Sample mean = 0.453916, std. deviation = 0.266599
4.3
3.3
2.3
X
1 .3 °
❑ ❑ ❑ Elf ❑ ❑
❑ ❑ ❑
0.3 ® ® ❑ ru
-0.7 -
0 50 100 150 200 250 300 350
Row number

Box-and-Whisker Plot
+ O ® ®e ® ®F9
o cv co LO
X

NCO085839- UNIMIN Red Hill Facility Instream Monitoring Data
North Toe River
Upstream
50 ft upstream of discharge
Date Year pH Turbidity Fluoride
SU NTU mg/L
2-Apr 2005 6.75 22 0.19
5-Apr 2005 7.37 3 0.18
12-Apr 2005 7.04 3 0.17
14-Apr 2005 6.84 14 0.17
21-Apr 2005 7.08 2 0.17
22-Apr 2005 7.27 21 0.17
26-Apr 2005 7.09 2 0.15
28-Apr 2005 7.18 5 0.20
3-May 2005 7.14 1 0.20
5-May 2005 7.22 4 0.41
10-May 2005 7.44 43 0.20
13-May 2005 7.20 4 0.45
17-May 2005 7.24 4 0.20
20-May 2005 7.11 8 0.36
24-May 2005 7.33 4
27-May 2005 7.63 2 0.35
1-Jun 2005 7.40 6 0.34
3-Jun 2005 7.17 7
7-Jun 2005 7.41 8 0.20
10-Jun 2005 7.26 11 0.26
15-Jun 2005 7.09 7 0.21
16-Jun 2005 7.33 5 0.20
21-Jun 2005 7.35 32 0.55
23-Jun 2005 7.75 7 0.22
28-Jun 2005 7.31 27 0.20
30-Jun 2005 7.94 6 0.39
4-Jul 2005 7.22 0.14
6-Jul 2005 7.73 7 0.04
12-Jul 2005 8.61 2 0.53
13-Jul 2005 8.48 2
14-Jul 2005 8.62 1 0.83
18-Jul 2005 8.23 2
21-Jul 2005 6.99 31 0.71
27-Jul 2005 7.82 3 0.81
29-Jul 2005 7.66 2 0.37
2-Aug 2005 7.79 2 0.38
5-Aug 2005 8.10 2 0.58
10-Aug 2005 7.20 14 1.31
12-Aug 2005 7.48 11 0.84
16-Aug 2005 7.56 13 0.81
19-Aug 2005 7.41 9 0.83
23-Aug 2005 7.83 4 0.47
25-Aug 2005 7.59 4 0.63

29-Aug 2005 7.44 4 0.84
7-Sep 2005 7.28 1 0.20
9-Sep 2005 7.67 2 0.34
12-Sep 2005 7.31 2 0.33
13-Sep 2005 7.28 2 0.80
20-Sep 2005 7.84 1 0.22
23-Sep 2005 7.72 1 0.70
27-Sep 2005 7.36 3 0.34
30-Sep 2005 7.00 1 0.61
4-Oct 2005 7.03 1 0.48
6-Oct 2005 7.22 7 0.20
11-Oct 2005 7.24 2 0.22
13-Oct 2005 7.94 4
18-Oct 2005 7.87 3
21-Oct 2005 7.80 2
25-Oct 2005 7.07 1 0.79
27-Oct 2005 7.24 1 1.14
2-Nov 2005 7.31 1 0.64
4-Nov 2005 7.40 1 0.82
8-Nov 2005 7.23 1 0.44
9-Nov 2005 7.41 1 0.46
14-Nov 2005 7.11 1 0.29
16-Nov 2005 8.85 1 0.44
22-Nov 2005 6.72 13 0.20
24-Nov 2005 7.32 4 0.27
28-Nov 2005 7.01 2 0.30
1-Dec 2005 6.91 32 0.20
6-Dec 2005 7.71 12 0.25
9-Dec 2005 7.54 4 0.27
16-Dec 2005 7.41 3 0.25
17-Dec 2005 7.33 3 0.92
19-Dec 2005 7.40 3 0.31
20-Dec 2005 7.44 3 0.35
27-Dec 2005 7.55 2 0.44
28-Dec 2005 7.42 2 0.38
4-Jan 2006 7.25 8 0.27
5-Jan 2006 7.33 6 0.27
12-Jan 2006 7.48 2 0.63
13-Jan 2006 7.32 2 0.94
16-Jan 2006 7.41 2 0.28
17-Jan 2006 7.33 2 0.23
19-Jan 2006 7.25 9 0.20
24-Jan 2006 7.38 4 0.22
26-Jan 2006 7.38 2 0.30
2-Feb 2006 7.51 3 0.33
4-Feb 2006 7.40 3 0.38
6-Feb 2006 7.26 5 0.21
7-Feb 2006 7.30 3 0.25
9-Feb 2006 7.43 2 0.31
14-Feb 2006 7.30 2 0.17
17-Feb 2006 7.36 2 0.20

21-Feb 2006 7.53 2 0.20
24-Feb 2006 7.89 3 0.21
2-Mar 2006 7.78 1 0.34
6-Mar 2006 7.42 1 0.37
7-Mar 2006 7.42 2 0.29
13-Mar 2006 8.26 1 0.36
14-Mar 2006 7.94 3 0.21
21-Mar 2006 7.33 16 0.25
22-Mar 2006 7.23 5 0.20
27-Mar 2006 7.55 2 0.20
28-Mar 2006 7.65 1 0.32
4-Apr 2006 7.45 4 0.21
7-Apr 2006 7.84 1 0.42
10-Apr 2006 7.41 7 1.10
11-Apr 2006 7.24 2 0.84
19-Apr 2006 7.20 18 1.21
21-Apr 2006 7.17 8 0.94
25-Apr 2006 7.31 4 0.78
28-Apr 2006 7.16 6 0.37
2-May 2006 7.22 4 0.20
4-May 2006 7.23 3 0.20
9-May 2006 7.37 2 0.23
11-May 2006 7.25 2 0.22
15-May 2006 7.50 2 0.20
17-May 2006 7.44 2 0.20
22-May 2006 7.52 5 0.20
23-May 2006 7.05 2 0.20
30-May 2006 7.46 3 0.36
31-May 2006 8.02 3 0.38
3-Jul 2006 7.98 3 0.54
4-Jul 2006 7.14 5 0.54
11-Jul 2006 7.79 2 0.24
13-Jul 2006 7.81 2 0.22
18-Jul 2006 7.42 2 0.21
21-Jul 2006 7.27 2 0.20
24-Jul 2006 7.87 3 0.31
27-Jul 2006 7.54 2
2-Aug 2006 8.12 1 0.54
4-Aug 2006 7.88 1 0.52
8-Aug 2006 7.97 2 0.44
10-Aug 2006 7.43 1 0.98
14-Aug 2006 7.38 6 0.34
15-Aug 2006 7.25 6 0.28
17-Aug 2006 7.51 2 0.77
20-Aug 2006 6.68 9 0.56
23-Aug 2006 7.37 2 0.61
24-Aug 2006 7.25 2 0.54
29-Aug 2006 7.98 1 0.41
30-Aug 2006 8.20 1 0.30
1-Sep 2006 6.02 19 0.20
6-Sep 2006 7.30 13 0.20

i
7-Sep 2006 6.81 4 0.29
14-Sep 2006 7.08 9 0.22
15-Sep 2006 7.37 3 0.26
18-Sep 2006 7.99 1 0.38
19-Sep 2006 7.92 1 0.55
27-Sep 2006 8.66 1 0.58
29-Sep 2006 7.44 2 0.62
3-Oct 2006 7.62 2 0.69
6-Oct 2006 7.37 1 0.72
11-Oct 2006 7.09 1 0.54
12-Oct 2006 7.26 1 0.36
16-Oct 2006 7.38 1 0.63
17-Oct 2006 7.05 9 0.63
19-Oct 2006 7.21 2 0.36
24-Oct 2006 7.09 1 0.33
25-Oct 2006 7.17 1 0.68
31-Oct 2006 7.37 1 0.29
1-Nov 2006 7.29 2 0.48
6-Nov 2006 6.84 1 0.32
7-Nov 2006 7.17 1 0.31
9-Nov 2006 6.98 8 0.23
14-Nov 2006 7.18 5 0.20
16-Nov 2006 6.84 30 0.26
22-Nov 2006 6.95 1 0.34
23-Nov 2006 7.01 1 0.36
27-Nov 2006 6.97 1 0.27
28-Nov 2006 6.88 1 0.26
30-Nov 2006 7.24 2 0.38
6-Dec 2006 7.23 1 0.51
8-Dec 2006 6.84 1 0.43
13-Dec 2006 7.32 2 1.11
14-Dec 2006 7.27 3 1.34
18-Dec 2006 7.40 1 0.48
19-Dec 2006 7.41 1 0.33
22-Dec 2006 7.28 1 0.57
26-Dec 2006 7.20 5 0.20
28-Dec 2006 7.18 2 0.24
2-Jan 2007 6.94 6 0.20
3-Jan 2007 6.88 4 0.20
11-Jan 2007 6.80 2 0.26
12-Jan 2007 6.94 2 0.28
16-Jan 2007 7.44 2 0.29
18-Jan 2007 7.16 1 0.37
23-Jan 2007 7.12 2 0.24
26-Jan 2007 7.10 1 0.29
30-Jan 2007 7.10 1 0.26
2-Feb 2007 7.08 1 0.44
6-Feb 2007 7.11 1 0.49
8-Feb 2007 6.72 1 0.47
13-Feb 2007 7.18 1 0.33
15-Feb 2007 6.90 1 0.44

i
19-Feb 2007 6.89 1 0.48
22-Feb 2007 6.84 2 0.50
27-Feb 2007 7.81 2 0.43
28-Feb 2007 7.52 1 0.40
2-Mar 2007 6.91 18 0.21
6-Mar 2007 7.18 1 0.31
8-Mar 2007 7.33 2 0.44
13-Mar 2007 7.80 1 0.21
15-Mar 2007 7.87 1 0.26
20-Mar 2007 7.28 1 0.20
22-Mar 2007 7.91 1 0.26
27-Mar 2007 8.31 3 0.20
30-Mar 2007 7.76 3 0.24
2-Apr 2007 7.80 2 0.49
3-Apr 2007 7.14 2 0.68
10-Apr 2007 7.68 1 0.49
12-Apr 2007 7.53 1 0.64
18-Apr 2007 7.25 1 0.68
19-Apr 2007 7.28 2 0.39
23-Apr 2007 6.97 1 0.64
24-Apr 2007 6.78 1 0.74
30-Apr 2007 7.39 1 0.20
2-May 2007 7.56 1 0.53
8-May 2007 7.50 1 0.19
10-May 2007 7.67 2 0.51
14-May 2007 7.49 1 0.34
14-May 2007 7.37 1 0.31
17-May 2007 7.36 2 0.63
22-May 2007 7.82 3 0.35
24-May 2007 7.21 2 0.41
29-May 2007 7.14 2 0.37
31-May 2007 7.59 2 0.65
4-Jun 2007 7.11 4 0.35
5-Jun 2007 7.32 2 0.41
14-Jun 2007 7.31 3 0.60
15-Jun 2007 7.28 3 0.37
18-Jun 2007 7.56 3 0.20
22-Jun 2007 7.73 4 0.35
27-Jun 2007 7.09 12 0.89
28-Jun 2007 7.59 4 0.45
5-Jul 2007 7.32 3 1.40
6-Jul 2007 7.96 3 0.70
10-Jul2007 7.82 4 0.40
13-Jul 2007 8.08 2 0.60
16-Jul 2007 7.05 2 1.10
17-Jul 2007 8.18 2 0.88
25-Jul 2007 6.80 38 0.63
26-Jul 2007 7.01 26 0.86
31-Jul 2007 7.12 5 0.76
2-Aug 2007 6.17 21 0.28
6-Aug 2007 7.87 4 0.57

i
10-Aug 2007 7.61 4 0.56
14-Aug 2007 8.18 3 1.05
17-Aug 2007 7.77 3 1.33
21-Aug 2007 6.84 2 1.35
23-Aug 2007 6.61 3 1.07
27-Aug 2007 7.50 4 1.02
28-Aug 2007 7.51 2 0.50
30-Aug 2007 8.04 2 1.17
4-Sep 2007 8.08 2 0.74
6-Sep 2007 7.80 1 0.61
9-Sep 2007 8.09 2 0.52
13-Sep 2007 7.87 1 0.54
18-Sep 2007 7.88 1 0.64
21-Sep 2007 8.53 1 0.62
22-Sep 2007 8.74 1 0.27
23-Sep 2007 8.10 1 0.36
25-Sep 2007 8.51 1 0.60
2-Oct 2007 8.72 1 0.57
4-Oct 2007 8.70 1 0.38
8-Oct 2007 8.30 2 0.45
9-Oct 2007 8.30 2 0.45
11-Oct 2007 8.37 1 0.41
16-Oct 2007 8.48 1 1.14
18-Oct 2007 8.17 1 0.80
23-Oct 2007 7.27 2 0.53
25-Oct 2007 7.06 1 0.46
29-Oct 2007 7.75 1 0.28
30-Oct 2007 7.82 1 0.68
1-Nov 2007 7.74 1 0.98
5-Nov 2007 7.56 1 0.87
10-Nov 2007 7.63 1 0.76
12-Nov 2007 7.43 1 0.92
15-Nov 2007 7.47 1 0.82
19-Nov 2007 7.86 1 1.07
22-Nov 2007 7.41 1 0.71
28-Nov 2007 7.38 1 0.45
30-Nov 2007 7.38 1 0.61
5-Dec 2007 7.80 1 0.84
7-Dec 2007 7.79 1 0.44
10-Dec 2007 7.85 1 0.42
11-Dec 2007 7.85 1 0.46
18-Dec 2007 7.64 1 0.27
21-Dec 2007 7.67 1 0.42
26-Dec 2007 7.43 1 0.28
28-Dec 2007 7.58 1 0.24
31-Dec 2007 7.51 10 0.32
3-Jan 2008 7.70 2 0.76
9-Jan 2008 7.54 2 0.81
11-Jan 2008 7.51 2 0.68
15-Jan 2008 7.72 3 0.36
18-Jan 2008 7.67 1 0.76

23-Jan 2008 7.67 2 0.24
26-Jan 2008 7.89 1 0.67
29-Jan 2008 7.28 1 0.34
5-Feb 2008 7.57 30 0.43
7-Feb 2008 7.48 10 0.20
11-Feb 2008 7.48 1 0.21
12-Feb 2008 7.48 1 0.25
20-Feb 2008 7.42 4 0.20
22-Feb 2008 7.15 3 0.24
26-Feb 2008 7.08 2 0.20
28-Feb 2008 7.46 3 0.25
3-Mar 2008 7.36 1 0.21
6-Mar 2008 7.41 1 0.23
11-Mar 2008 7.37 3 0.20
13-Mar 2008 7.68 2 0.20
19-Mar 2008 7.83 3 0.20
24-Mar 2008 7.53 2 0.20
25-Mar 2008 7.73 1 0.20
30-Mar 2008 7.81 2 0.54
95th Percentile Upstream Fluoride Data: 1.004

Red Hill Effluent Allowable Fluoride Calculations
Based on the upstream background concentration of 1.004 mg/l fluorides and a 7q 10 flow
of 90 cfs at the Red Hill discharge location on the Toe River,the allowable fluoride
discharge is calculated as follows:
In-stream allowable concentration of 1.8 mg/1 minus the background concentration of
1.004 mg/l allows for an increase of 0.796 mg/1.
(0.796 m )(90 cfs)(28.3171/ft3)(3600 sec/hr)(24 hr/dav) = 386.4 lb/day
(1000 mg/gx453.59 g/lb)

imin
Emvrvnmental Affairs Department
unT
Unimin Corporation � �
136 Crystal Drive•Spruce Pine,NC 28777
(PHONE)828/766-6081•(FAX)828/765-4755
February 8, 2008
CERTIFIED MAIL l
RETURN RECEIrT REQUESTED
FEB 1 4 2008 j
Mr. Charles H. Weaver,Jr.
NCDENR/Water Quality/NPDES Unit
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Subject: Request to Include Additional Emergency Pond
NPDES Modification Request for Unimin Corporation—Red Hill Facility
NPDES Permit Nos. NC0085839, Mitchell County, North Carolina
Dear Mr. Weaver:
Please accept this letter as a request to include an additional emergency pond in the
descriptions on the Supplement to Permit Cover Sheet to be included in the modification
of Unimin Corporation —Red Hill Facility's NPDES No. NCO085839 requested on May 30,
2007. Specifications of the proposed pond will be submitted for approval with the
Authorization to Construct (ATC) application to the Construction Grants & Loans Section
upon issuance of the draft NPDES permit to Public Notice
If you have any questions regarding this matter, require further information, or
anyway I can assist to expedite the modification approval please do not hesitate to contact
me at [phone] ext. 13. Thank you in advance for your efforts to help accelerate
issuance of the permit.
Sincerely,
J0 ' l
freyFergu on, P. E.
Environmental Engineer
UNIMIN CORPORATION
c: EA Files,Mike Jussila„Bruce Perkins

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SOC PRIORITY PROJECT: Yes No
IF YES, SOC NUMBER
TO: NPDES UNIT
WATER QUALITY SECTION
ATTENTION: Jim McKay
DATE: November 26, 2007
NPDES STAFF REPORT AND RECOMMENDATION
Mitchell County
Permit Number NC0085839
PART I - GENERAL INFORMATION
NOV 2 8 2007
1. Facility and Address: Unimin Corp
L
Red Hill Facility EEHR-WATER QUALITIV
Red Hill, North Carolina
Mailing: Jeff Ferguson
Unimin Corporation
136 Crystal Drive
Spruce Pine, North Carolina 28777
2. Date of Investigation: October 25, 2007
3. Report Prepared By: Keith Haynes
4. Persons Contacted and Telephone Number: Bruce Perkins
828-688-2169
5. Directions to Site: Off of Highway 197
6. Discharge Point(s), List for all discharge points:
Latitude: N 36 00' 50" degrees Longitude: W 82 16' 05" degrees
Attach a USGS map extract and indicate treatment facility site and discharge point on map.
U.S.G.S. Quad No. C9SE U.S.G.S. Quad Name Bakersville
7. Site size and expansion area consistent with application?
XX Yes No If No, explain:
8. Topography (relationship to flood plain included): Not in the flood plain. The site is on a
small hill.
-1-

9. Location of nearest dwelling: None with '/z mile
10. Receiving stream or affected surface waters: North Toe River
a. Classification: C Trout
b. River Basin and Sub-basin No.: French Broad 04-03-06
C. Describe receiving stream features and pertinent downstream uses: Wildlife habitat
and also trout fishing.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Waste Treatment Process
a. Volume of wastewater to be permitted
2.0 MGD (Ultimate Design Capacity)
b. What is the current permitted capacity of the Wastewater Treatment facility?
0.682MGD
C. Actual treatment capacity of the current facility- same as above
d. Date(s) and construction activities allowed by previous Authorizations to Construct
issued in the previous two years: N/A
e. Please provide a description of existing or substantially constructed wastewater
treatment facilities: Mix-reactor tanks, lime & polymer feed systems, thickener, drum
filter, pH adjustment, emergency pond and flow measurement.
f. Please provide a description of proposed wastewater treatment facilities: Additional
treatment will replicate current treatment, the only difference being that the new
thickener will be larger.
g. Possible toxic impacts to surface waters: Additional Fluoride.
h. Pretreatment Program (POTWs only): NA
in development approved
should be required not needed
2. Residuals handling and utilization/disposal scheme: N/A
a. If residuals are being land applied, please specify DWQ Permit Number
Residuals Contractor
Telephone Number
-2-

b. Residuals stabilization: PSRP PFRP OTHER
C. Landfill:
d. Other disposal/utilization scheme (Specify):
3. Treatment plant classification (attach completed rating sheet): N/A
4. SIC Codes(s): N/A
Primary Secondary
Main Treatment Unit Code:
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public monies
involved. (municipals only)? N/A
2. Special monitoring or limitations (including toxicity) requests: Same as current permit
3. Important SOC, JOC, or Compliance Schedule dates: (Please indicate)
Date
Submission of Plans and Specifications
Begin Construction
Complete Construction
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:
-3-

PART IV — EVALUATION AND RECOMMENDATIONS
The regional office recommends the issuance of the permit with special attention to the requested
increase in the fluoride limit.
Signature of Rep Preparer
Wat Quality Regional Supervisor
/1,1-o47—
Dat
-4-

North Toe River
Subject:North Toe River
From: James Mckay<[e-mail]>
Date: Wed, 31 Oct 2007 14:05:03 -0400
To: tom—[e-mail]
Tom:
Unimin Corporation currently operates a quartz mine and processing facility on the
North Toe river in Mitchell County, NC. The facility is about 15 miles downstream of
the impaired stream segment. Their current NPDES permit, NCO085839 and fact sheet
are attached as PDF files. They have filed a request for a permit modification to
allow an expansion and increase in flow and limits for Total Fluoride and Total
Suspended Solids. They have been in good compliance with their current permit
limits, and have failed only one Whole Effluent Toxicity Test (WET) in January,
2004. They passed two subsequent monthly tests. Data in the permit file lists the
discharge location as LAT. 35Ao 00' 5011, Long. 82Ao 16' 05".
Their current permit limits are:
Flow: 0.682 MGD (million gallons per day)
Total Fluoride: 200.0 lb/ day Monthly Average, 400.0 lb/ day Daily Max
Total Suspended Solids: 142.0 lb/ day Monthly Average, 284.0 lb/ day Daily Max.
They have requested a Flow limit of 2.0 MGD
Total Fluoride: 450.0 lb/ day Monthly Average, 900.0 lb/ day Daily Max
Total Suspended Solids: 417.0 lb/ day Monthly Average, 834.0 lb/ day Daily Max.
We need some guidance from you as to whether to issue the permit modification, and
how to proceed with any meetings, studies and/ or reviews we need to undertake.
Thank you for your help!
Jim McKay
Environmental Engineer
Eastern NPDES Program
NC Division of Water Quality
1617 Mail Service Center, Raleigh, NC 27699-1617
Voice: (919) 733-5083, ext. 595
Fax: (919) 733-0719
Content-Type: application/pdf
85839 Current permit2006.pdf
Content-Encoding: base64
Content-Type: application/pdf
85839.fct2006.pdfI
Content-Encoding: base64
I of 1 10/31/2007 2:05 PM

North Toe Mussels...
Subject: North Toe Mussels...
From: Michelle Raquet<[e-mail]>
Date: Thu, 25 Oct 2007 09:27:27 -0400
To:[e-mail]
Jim. . . I have not heard back from the biologists out at ESS, but I wanted to pass
along some information I reed from Bryan Tompkins with the USFWS in the Asheville
Regional Office. I left him a message asking about threatened or endangered mussels
in the North Toe River from Cane Creek to the confluence with Cane River (where the
Nolichucky begins) . This was his response. . . .
That stretch of North Toe River is designated critical habitat for the
federally endangered Appalachian elktoe. We have records of the federally
endangered Alasmidonta raveneliana (Appalachian elktoe) , the state listed
Lampsilis fasciola (Wavy rayed lamp mussel) , and Etheostoma acuticeps
(Sharphead darter) listed as a federal species of concern all occuring in
that reach of the North Toe. I can check with John Fridell (USFWS) but I believe
that that population of Appalachian elktoe is one of the better ones we
have. I will check on this also but I believe that this project will
trigger formal consultation with this office.
I'll let you know when I hear anything else, but this is what I have thus far.
--Michelle
Michelle Raquet
Basin Planner
NCDENR Division of Water Quality
Planning Section
Basinwide Planning Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Phone: [phone] x367
http://h2o.enr.state.nc.us/basinwide
I
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If
Fel
1 of 1 10/25/2007 1:33 PM

IWC Calculations
UNIMIN - Red Hill
NC0085839
Prepared By:Jim McKay, Eastern NPDES Program
Enter Design Flow(MGD): 2
Enter s7Q10(cfs): 90.7
Enter w7Q10 (cfs): 125.6
Residual Chlorine Ammonia(NH3 as N)
(summer)
7Q10(CFS) 90.7 7Q10 (CFS) 90.7
DESIGN FLOW (MGD) 2 DESIGN FLOW (MGD) 2
DESIGN FLOW (CFS) 3.1 DESIGN FLOW (CFS) 3.1
STREAM STD (UG/L) 17.0 STREAM STD (MG/L) 1.0
UPS BACKGROUND LEVEL(1 0 UPS BACKGROUND LEVEL 0.22
IWC(%) 3.30 IWC (%) 3.30
Allowable Conc. (ug/1) 514 Allowable Conc. (mg/1) 23.8
Ammonia(NH3 as N)
(winter)
7Q10(CFS) 125.6
Fecal Limit 200/100ml DESIGN FLOW (MGD) 2
(If DF >331; Monitor) DESIGN FLOW (CFS) 3.1
(If DF <331; Limit) STREAM STD (MG/L) 1.8
Dilution Factor(DF) 30.26 UPS BACKGROUND LEVEL 0.22
IWC(%) 2.41
Allowable Conc. (mg/1) 65.8
NPDES Servor/Current Versions/IWC
10/18/2007

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Unimin- Unimin"
School
Quartz
c,'4 3.6 MGD �m House
Unimin- Quartz
Red
Red Hill �� 2.16 MGD
0.682 CO)
MGD
o K-T Feldspar 1.73 MGDorth —
North Toe River
c°e River
CD
�–
Unimin- Feldspar 3.5 MGD
Crystal
0.360 MGD
MINE DISCHARGES ON THE NORTH TOE RIVER

Engineering Alternatives Analysis (EAA)
Prepared by Jeffrey S. Ferguson
Environmental Engineer
Purpose
The purpose of this report is to evaluate the feasibility of different disposal methods for
the 2.0 million gallons per day(MGD)of industrial wastewater that will be generated by
Unimin's Red Hill Facility.
I. General Information
A. Facility Location: Unimin Corporation—Red Hill Facility
Mitchell County
Post Office Box 588
Highway 197 North
Spruce Pine,N.C. 28777
Report prepared by: Jeffrey S. Ferguson,P.E.
Environmental Engineer
Unimin Corporation
Post Office Box 588
136 Crystal Drive
Spruce Pine,N.C. 28777
B. Description of existing discharge:
The wastewater treatment plant consists of mix-reactor tanks, lime and
polymer feed systems,thickener, drum filter,pH adjustment, and flow
measurement. The plant is currently limiting flow to—474 gpm average.
The pH of the wastewater is controlled by neutralization of acid with
hydrated lime. During this process,the calcium from the lime combines
with F-ions to form calcium fluoride which can then be precipitated out of
the wastewater. The precipitate and any other solids in the wastewater are
then removed by flocculation and sedimentation in the thickener. The
underflow from the thickener is further dewatered by vacuum filtration
before the solids are disposed of off-site. The process of lime
neutralization of the acidity and fluoride content of wastewater occur in
three mixing tanks. The future proposed wastewater treatment system will
consist of the exact same processes as the existing system. The existing
EIMCO 60' thickener was installed to accommodate expansions
(originally designed 34' based on test work by EIMCO) and has been
determined to accommodate—500 gpm,while the proposed EIMCO 70'
thickener has been determined to accommodate—700 gpm,resulting in the
requested flow limit of 2.0 MGD. The requested increase in TSS and Fl is
proportionate to the requested increase in flow.
Page 1 of 1

Overflow from both thickeners will flow into a sump and thence to Outfall
001. This flow will be able to be diverted to the existing emergency
pond. Underflow from the proposed thickener will be pumped by a
diaphragm pump to a drum filter,with provision to dump this flow to the
existing emergency pond. The overflow from the drum filter will flow via
gravity to the feed well of the thickener. The filtrate will be pumped back
to the feed well of the thickener. The filtrate solids are hauled to the
permitted mining waste disposal sites at either the Quartz or Schoolhouse
Quartz Facilities.
C. The industrial process served by the wastewater treatment works is a high
purity quartz purification facility. The purification of high purity quartz
uses hydrofluoric and hydrochloric acids. Air pollutants from the process
include HCl and HF and particulates which are scrubbed from the air by
wet scrubbers. The untreated wastewater therefore consists of fluoride,
chloride and total suspended solids.
D. The requested increase in flow is for expansion of the facility over the
next year. The treatment works are designed with a final build-out flow of
2.0 MGD in mind. Unimin expects to reach the 2.0 MGD level at
sometime in the next two to five years.
H. Evaluation of Environmental Feasibility of Discharge Alternatives
1. Connection to sewage system
This alternative was eliminated due to the plant site's remote location.
The plant site is located in a rural mountainous county with very little
infrastructure. The nearest towns with existing sewer systems are
Bakersville(-8 miles away) and Spruce Pine(-18 miles away).
2. Subsurface disposal system
The metamorphic and igneous bedrock geology of the region is not
conducive to subsurface disposal systems. The site is characterized by
thin mineral soils overlying rock types with low specific yields. Igneous
and metamorphic rocks generally have very poor primary porosity. The
porosity of these rock types is generally due to secondary fractures and
fissures in the rock. As a consequence of thinner soils and bedrock
conditions, the subsurface materials will not be expected to absorb large
influxes of wastewater without becoming fully saturated. Subsurface
disposal systems for the type of flows existing and proposed should only
be considered a possible alternative within the coastal plain deposits of
southeastern North Carolina.
Page 2 of 2

3. Land Application
Spray irrigation systems operate under the principle of applying the water
to an area of land which will allow vegetation to utilize the water. This
alternative is generally feasible when the wastewater contains nitrogen and
other nutrients as wastewater contaminants. This system requires sites
with soils of high permeability and high hydraulic loadings. The site slope
characteristics should be conducive to a low potential for surface runoff.
The industrial wastewater from the Red Hill facility does not have high
nutrient value. The primary wastewater after treatment contains dissolved
solids of CaF2, CaC12 and suspended solids. The application of this water
by spraying it on a suitable site would result in a buildup of CaC12 in the
soil,reducing the effectiveness of the vegetation. The real problem,
however,with the Red Hill facility site lies in the slope characteristics of
the site. The slopes of an ideal irrigation site would be on average, less
than 5%. The Red Hill site has slopes averaging over 11%. Disposal
using irrigation will not work well with the topographic relief of the site
for the disposal of the quantity of wastewater that will be generated by the
plant because the slopes increase the potential for surface runoff.
4. Direct Discharge to Surface Waters
Discharge to a flowing stream was the only option selected for disposal of
the Red Hill facility's treated wastewater. The existing outfall location is
on the North Toe River with a 7Q 10 rate of—90 cubic feet per second.
5. Wastewater Reuse
Contamination of the final product is a critical segment of processing high
purity quartz. Reuse of wastewater is not an option due to contamination.
Conclusion
Due to the unique quartz purification process,the wastewater disposal alternatives
selected for the Red Hill facility is to discharge the water back to the North Toe
River. This alternative is deemed the most appropriate after taking into account
the site characteristics, discharge parameters, and site location.
Page 3 of 3

vogsd � 9
b Ol

Unimin Apr 2005 thru 2008
Unimin upstream Apr 2005 -Apr 2008
Upstream "where<.2 =0.1
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data
SU NTU mg/ L mgll
2-Apr 2005 6.75 22 0.19 0.19
5-Apr 2005 7.37 3 0.18 0.18
12-Apr 2005 7.04 3 0.17 0.17
14-Apr 2005 6.84 14 0.17 0.17
21-Apr 2005 7.08 2 0.17 0.17
22-Apr 2005 7.27 21 0.17 0.17
26-Apr 2005 7.09 2 0.15 0.15
28-Apr 2005 7.18 5 0.20 0.20
3-May 2005 7.14 1 0.20 0.10
5-May 2005 7.22 4 0.41 0.41
10-May 2005 7.44 43 0.20 0.10
13-May 2005 7.20 4 0.45 0.45
17-May 2005 7.24 4 0.20 0.10
20-May 2005 7.11 8 0.36 0.36
24-May 2005 7.33 4 1.83 ` 1.83
27-May 2005 7.63 2 0.35 0.35
1-Jun 2005 7.40 6 0.34 0.34
3-Jun 2005 7.17 7 3.54 3.54 3.
7-Jun 2005 7.41 8 0.20 0.10
10-Jun 2005 7.26 11 0.26 0.26
15-Jun 2005 7.09 7 0.21 0.21
16-Jun 2005 7.33 5 0.20 0.10
21-Jun 2005 7.35 32 0.55 0.55
23-Jun 2005 7.75 7 0.22 0.22
28-Jun 2005 7.31 27 0.20 0.10
30-Jun 2005 7.94 6 0.39 0.39
4-Jul 2005 7.22 0.14 0.14
6-Jul 2005 7.73 7 0.04 0.04
12-Jul 2005 8.61 2 0.53 0.53
13-Jul 2005 8.48 2 4.16 4.16
14-Jul 2005 8.62 1 0.83 0.83
18-Jul 2005 8.23 2 4.27 4.27
21-Jul 2005 6.99 31 0.71 0.71
27-Jul 2005 7.82 3 0.81 0.81
29-Jul 2005 7.66 2 0.37 0.37
2-Aug 2005 7.79 2 0.38 0.38
5-Aug 2005 8.10 2 0.58 0.58
10-Aug 2005 7.20 14 1.31 1.31
12-Aug 2005 7.48 11 0.84 0.84
16-Aug 2005 7.56 13 0.81 0.81
19-Aug 2005 7.41 9 0.83 0.83
23-Aug 2005 7.83 4 0.47 0.47
25-Aug 2005 7.59 4 0.63 0.63
1

Unimin Apr 2005 thru 2008
Upstream "where<.2=0.1
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data
SU NTLI mg/L mg/l
29-Aug 2005 7.44 4 0.84 0.84
7-Sep 2005 7.28 1 0.20 0.10
9-Sep 2005 7.67 2 0.34 0.34
12-Sep 2005 7.31 2 0.33 0.33
13-Sep 2005 7.28 2 0.80 0.80
20-Sep 2005 7.84 1 0.22 0.22
23-Sep 2005 7.72 1 0.70 0.70
27-Sep 2005 7.36 3 0.34 0.34
30-Sep 2005 7.00 1 0.61 0.61
4-Oct 2005 7.03 1 0.48 0.48
6-Oct 2005 7.22 7 0.20 0.10
11-Oct 2005 7.24 2 0.22 0.22
13-Oct 2005 7.94 4 3.04 3.04
18-Oct 2005 7.87 3 2.16 2.16
21-Oct 2005 7.80 2 2.25 2.25
25-Oct 2005 7.07 1 0.79 0.79
27-Oct 2005 7.24 1 1.14 1.14
2-Nov 2005 7.31 1 0.64 0.64
4-Nov 2005 7.40 1 0.82 0.82
8-Nov 2005 7.23 1 0.44 0.44
9-Nov 2005 7.41 1 0.46 0.46
14-Nov 2005 7.11 1 0.29 0.29
16-Nov 2005 8.85 1 0.44 0.44
22-Nov 2005 6.72 13 0.20 0.10
24-Nov 2005 7.32 4 0.27 0.27
28-Nov 2005 7.01 2 0.30 0.30
1-Dec 2005 6.91 32 0.20 0.10
6-Dec 2005 7.71 12 0.25 0.25
9-Dec 2005 7.54 4 0.27 0.27
16-Dec 2005 7.41 3 0.25 0.25
17-Dec 2005 7.33 3 0.92 0.92
19-Dec 2005 7.40 3 0.31 0.31
20-Dec 2005 7.44 3 0.35 0.35
27-Dec 2005 7.55 2 0.44 0.44
28-Dec 2005 7.42 2 0.38 0.38
4-Jan 2006 7.25 8 0.27 0.27
5-Jan 2006 7.33 6 0.27 0.27
12-Jan 2006 7.48 2 0.63 0.63
13-Jan 2006 7.32 2 0.94 0.94
16-Jan 2006 7.41 2 0.28 0.28
17-Jan 2006 7.33 2 0.23 0.23
19-Jan 2006 7.25 9 0.20 0.10
24-Jan 2006 7.38 4 0.22 0.22
26-Jan 2006 7.38 2 0.30 0.30
2-Feb 2006 7.51 3 0.33 0.33
4-Feb 2006 7.40 3 0.38 0.38
6-Feb 2006 7.26 5 0.21 0.21
2

Unimin Apr 2005 thru 2008
Upstream "where <.2= 0.1
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data
SU NTU mg/L mg/I
7-Feb 2006 7.30 3 0.25 0.25
9-Feb 2006 7.43 2 0.31 0.31
14-Feb 2006 7.30 2 0.17 0.17
17-Feb 2006 7.36 2 0.20 0.20
21-Feb 2006 7.53 2 0.20 0.20
24-Feb 2006 7.89 3 0.21 0.21
2-Mar 2006 7.78 1 0.34 0.34
6-Mar 2006 7.42 1 0.37 0.37
7-Mar 2006 7.42 2 0.29 0.29
13-Mar 2006 8.26 1 0.36 0.36
14-Mar 2006 7.94 3 0.21 0.21
21-Mar 2006 7.33 16 0.25 0.25
22-Mar 2006 7.23 5 0.20 0.20
27-Mar 2006 7.55 2 0.20 0.10
28-Mar 2006 7.65 1 0.32 0.32
4-Apr 2006 7.45 4 0.21 0.21
7-Apr 2006 7.84 1 0.42 0.42
10-Apr 2006 7.41 7 1.10 1.10
11-Apr 2006 7.24 2 0.84 0.84
19-Apr 2006 7.20 18 1.21 1.21
21-Apr 2006 7.17 8 0.94 0.94
25-Apr 2006 7.31 4 0.78 0.78
28-Apr 2006 7.16 6 0.37 0.37
2-May 2006 7.22 4 0.20 0.10
4-May 2006 7.23 3 0.20 0.10
9-May 2006 7.37 2 0.23 0.23
11-May 2006 7.25 2 0.22 0.22
15-May 2006 7.50 2 0.20 0.10
17-May 2006 7.44 2 0.20 0.10
22-May 2006 7.52 5 0.20 0.10
23-May 2006 7.05 2 0.20 0.10
30-May 2006 7.46 3 0.36 0.36
31-May 2006 8.02 3 0.38 0.38
3-Jul 2006 7.98 3 0.54 0.54
4-Jul 2006 7.14 5 0.54 0.54
11-Jul 2006 7.79 2 0.24 0.24
13-Jul 2006 7.81 2 0.22 0.22
18-Jul 2006 7.42 2 0.21 0.21
21-Jul 2006 7.27 2 0.20 0.10
24-Jul 2006 7.87 3 0.31 0.31
27-Jul 2006 7.54 2
2-Aug 2006 8.12 1 0.54 0.54
4-Aug 2006 7.88 1 0.52 0.52
8-Aug 2006 7.97 2 0.44 0.44
10-Aug 2006 7.43 1 0.98 0.98
14-Aug 2006 7.38 6 0.34 0.34
15-Aug 2006 7.25 6 0.28 0.28
3

Unimin Apr 2005 thru 2008
Upstream 'where<.2=0.1
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data
SU NTU mg/L mg/l
17-Aug 2006 7.51 2 0.77 0.77
20-Aug 2006 6.68 9 0.56 0.56
23-Aug 2006 7.37 2 0.61 0.61
24-Aug 2006 7.25 2 0.54 0.54
29-Aug 2006 7.98 1 0.41 0.41
30-Aug 2006 8.20 1 0.30 0.30
1-Sep 2006 6.02 19 0.20 0.10
6-Sep 2006 7.30 13 0.20 0.20
7-Sep 2006 6.81 4 0.29 0.29
14-Sep 2006 7.08 9 0.22 0.22
15-Sep 2006 7.37 3 0.26 0.26
18-Sep 2006 7.99 1 0.38 0.38
19-Sep 2006 7.92 1 0.55 0.55
27-Sep 2006 8.66 1 0.58 0.58
29-Sep 2006 7.44 2 0.62 0.62
3-Oct 2006 7.62 2 0.69 0.69
6-Oct 2006 7.37 1 0.72 0.72
11-Oct 2006 7.09 1 0.54 0.54
12-Oct 2006 7.26 1 0.36 0.36
16-Oct 2006 7.38 1 0.63 0.63
17-Oct 2006 7.05 9 0.63 0.63
19-Oct 2006 7.21 2 0.36 0.36
24-Oct 2006 7.09 1 0.33 0.33
25-Oct 2006 7.17 1 0.68 0.68
31-Oct 2006 7.37 1 0.29 0.29
1-Nov 2006 7.29 2 0.48 0.48
6-Nov 2006 6.84 1 0.32 0.32
7-Nov 2006 7.17 1 0.31 0.31
9-Nov 2006 6.98 8 0.23 0.23
14-Nov 2006 7.18 5 0.20 0.20
16-Nov 2006 6.84 30 0.26 0.26
22-Nov 2006 6.95 1 0.34 0.34
23-Nov 2006 7.01 1 0.36 0.36
27-Nov 2006 6.97 1 0.27 0.27
28-Nov 2006 6.88 1 0.26 0.26
30-Nov 2006 7.24 2 0.38 0.38
6-Dec 2006 7.23 1 0.51 0.51
8-Dec 2006 6.84 1 0.43 0.43
13-Dec 2006 7.32 2 1.11 1.11
14-Dec 2006 7.27 3 1.34 1.34
18-Dec 2006 7.40 1 0.48 0.48
19-Dec 2006 7.41 1 0.33 0.33
22-Dec 2006 7.28 1 0.57 0.57
26-Dec 2006 7.20 5 0.20 0.10
28-Dec 2006 7.18 2 0.24 0.24
2-Jan 2007 6.94 6 0.20 0.10
3-Jan 2007 6.88 4 0.20 0.20
4

Unimin Apr 2005 thru 2008
Upstream "where<.2=0.1
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data
SU NTU mg/L mg/1
11-Jan 2007 6.80 2 0.26 0.26
12-Jan 2007 6.94 2 0.28 0.28
16-Jan 2007 7.44 2 0.29 0.29
18-Jan 2007 7.16 1 0.37 0.37
23-Jan 2007 7.12 2 0.24 0.24
26-Jan 2007 7.10 1 0.29 0.29
30-Jan 2007 7.10 1 0.26 0.26
2-Feb 2007 7.08 1 0.44 0.44
6-Feb 2007 7.11 1 0.49 0.49
8-Feb 2007 6.72 1 0.47 0.47
13-Feb 2007 7.18 1 0.33 0.33
15-Feb 2007 6.90 1 0.44 0.44
19-Feb 2007 6.89 1 0.48 0.48
22-Feb 2007 6.84 2 0.50 0.50
27-Feb 2007 7.81 2 0.43 0.43
28-Feb 2007 7.52 1 0.40 0.40
2-Mar 2007 6.91 18 0.21 0.21
6-Mar 2007 7.18 1 0.31 0.31
8-Mar 2007 7.33 2 0.44 0.44
13-Mar 2007 7.80 1 0.21 0.21
15-Mar 2007 7.87 1 0.26 0.26
20-Mar 2007 7.28 1 0.20 0.10
22-Mar 2007 7.91 1 0.26 0.26
27-Mar 2007 8.31 3 0.20 0.10
30-Mar 2007 7.76 3 0.24 0.24
2-Apr 2007 7.80 2 0.49 0.49
3-Apr 2007 7.14 2 0.68 0.68
10-Apr 2007 7.68 1 0.49 0.49
12-Apr 2007 7.53 1 0.64 0.64
18-Apr 2007 7.25 1 0.68 0.68
19-Apr 2007 7.28 2 0.39 0.39
23-Apr 2007 6.97 1 0.64 0.64
24-Apr 2007 6.78 1 0.74 0.74
30-Apr 2007 7.39 1 0.20 0.10
2-May 2007 7.56 1 0.53 0.53
8-May 2007 7.50 1 0.19 0.19
10-May 2007 7.67 2 0.51 0.51
14-May 2007 7.49 1 0.34 0.34
14-May 2007 7.37 1 0.31 0.31
17-May 2007 7.36 2 0.63 0.63
22-May 2007 7.82 3 0.35 0.35
24-May 2007 7.21 2 0.41 0.41
29-May 2007 7.14 2 0.37 0.37
31-May 2007 7.59 2 0.65 0.65
4-Jun 2007 7.11 4 0.35 0.35
5-Jun 2007 7.32 2 0.41 0.41
14-Jun 2007 7.31 3 0.60 0.60
5

1
Unimin Apr 2005 thru 2008
Upstream "where<.2=0.1
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data
SU NTU mg/L mgll
15-Jun 2007 7.28 3 0.37 0.37
18-Jun 2007 7.56 3 0.20 0.10
22-Jun 2007 7.73 4 0.35 0.35
27-Jun 2007 7.09 12 0.89 0.89
28-Jun 2007 7.59 4 0.45 0.45
5-Jul 2007 7.32 3 1.40 1.40
6-Jul 2007 7.96 3 0.70 0.70
10-Jul 2007 7.82 4 0.40 0.40
13-Jul 2007 8.08 2 0.60 0.60
16-Jul 2007 7.05 2 1.10 1.10
17-Jul 2007 8.18 2 0.88 0.88
25-Jul 2007 6.80 38 0.63 0.63
26-Jul 2007 7.01 26 0.86 0.86
31-Jul 2007 7.12 5 0.76 0.76
2-Aug 2007 6.17 21 0.28 0.28
6-Aug 2007 7.87 4 0.57 0.57
10-Aug 2007 7.61 4 0.56 0.56
14-Aug 2007 8.18 3 1.05 1.05
17-Aug 2007 7.77 3 1.33 1.33
21-Aug 2007 6.84 2 1.35 1.35
23-Aug 2007 6.61 3 1.07 1.07
27-Aug 2007 7.50 4 1.02 1.02
28-Aug 2007 7.51 2 0.50 0.50
30-Aug 2007 8.04 2 1.17 1.17
4-Sep 2007 8.08 2 0.74 0.74
6-Sep 2007 7.80 1 0.61 0.61
9-Sep 2007 8.09 2 0.52 0.52
13-Sep 2007 7.87 1 0.54 0.54
18-Sep 2007 7.88 1 0.64 0.64
21-Sep 2007 8.53 1 0.62 0.62
22-Sep 2007 8.74 1 0.27 0.27
23-Sep 2007 8.10 1 0.36 0.36
25-Sep 2007 8.51 1 0.60 0.60
2-Oct 2007 8.72 1 0.57 0.57
4-Oct 2007 8.70 1 0.38 0.38
8-Oct 2007 8.30 2 0.45 0.45
9-Oct 2007 8.30 2 0.45 0.45
11-Oct 2007 8.37 1 0.41 0.41
16-Oct 2007 8.48 1 1.14 1.14
18-Oct 2007 8.17 1 0.80 0.80
23-Oct 2007 7.27 2 0.53 0.53
25-Oct 2007 7.06 1 0.46 0.46
29-Oct 2007 7.75 1 0.28 0.28
30-Oct 2007 7.82 1 0.68 0.68
1-Nov 2007 7.74 1 0.98 0.98
5-Nov 2007 7.56 1 0.87 0.87
10-Nov 2007 7.63 1 0.76 0.76
6

Unimin Apr 2005 thru 2008
Upstream "where<.2=0.1
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data
SU NTU mg/L mg/l
12-Nov 2007 7.43 1 0.92 0.92
15-Nov 2007 7.47 1 0.82 0.82
19-Nov 2007 7.86 1 1.07 1.07
22-Nov 2007 7.41 1 0.71 0.71
28-Nov 2007 7.38 1 0.45 0.45
30-Nov 2007 7.38 1 0.61 0.61
5-Dec 2007 7.80 1 0.84 0.84
7-Dec 2007 7.79 1 0.44 0.44
10-Dec 2007 7.85 1 0.42 0.42
11-Dec 2007 7.85 1 0.46 0.46
18-Dec 2007 7.64 1 0.27 0.27
21-Dec 2007 7.67 1 0.42 0.42
26-Dec 2007 7.43 1 0.28 0.28
28-Dec 2007 7.58 1 0.24 0.24
31-Dec 2007 7.51 10 0.32 0.32
3-Jan 2008 7.70 2 0.76 0.76
9-Jan 2008 7.54 2 0.81 0.81
11-Jan 2008 7.51 2 0.68 0.68
15-Jan 2008 7.72 3 0.36 0.36
18-Jan 2008 7.67 1 0.76 0.76
23-Jan 2008 7.67 2 0.24 0.24
26-Jan 2008 7.89 1 0.67 0.67
29-Jan 2008 7.28 1 0.34 0.34
5-Feb 2008 7.57 30 0.43 0.43
7-Feb 2008 7.48 10 0.20 0.10
11-Feb 2008 7.48 1 0.21 0.21
12-Feb 2008 7.48 1 0.25 0.25
20-Feb 2008 7.42 4 0.20 0.10
22-Feb 2008 7.15 3 0.24 0.24
26-Feb 2008 7.08 2 0.20 0.10
28-Feb 2008 7.46 3 0.25 0.25
3-Mar 2008 7.36 1 0.21 0.21
6-Mar 2008 7.41 1 0.23 0.23
11-Mar 2008 7.37 3 0.20 0.10
13-Mar 2008 7.68 2 0.20 0.10
19-Mar 2008 7.83 3 0.20 0.10
24-Mar 2008 7.53 2 0.20 0.10
25-Mar 2008 7.73 1 0.20 0.10
30-Mar 2008 7.81 2 0.54 0.54
1.1175 95th percentile=
0.50 Average=
7

Unimin Apr 2006 to 2008
Unimin Red Hill
Upstream
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data "where<.2=0.1
SU NTU mg/L mg/I
4-Apr 2006 7.45 4 0.21 0.21
7-Apr 2006 7.84 1 0.42 0.42
10-Apr 2006 7.41 7 1.10 1.10
11-Apr 2006 7.24 2 0.84 0.84
19-Apr 2006 7.20 18 1.21 1.21
21-Apr 2006 7.17 8 0.94 0.94
25-Apr 2006 7.31 4 0.78 0.78
28-Apr 2006 7.16 6 0.37 0.37
2-May 2006 7.22 4 <0.2 0.10
4-May 2006 7.23 3 <0.2 0.10
9-May 2006 7.37 2 0.23 0.23
11-May 2006 7.25 2 0.22 0.22
15-May 2006 7.50 2 <0.2 0.10
17-May 2006 7.44 2 <0.2 0.10
22-May 2006 7.52 5 <0.2 0.10
23-May 2006 7.05 2 <0.2 0.10
30-May 2006 7.46 3 0.36 0.36
31-May 2006 8.02 3 0.38 0.38
3-Jul 2006 7.98 3 0.54 0.54
4-Jul 2006 7.14 5 0.54 0.54
11-Jul 2006 7.79 2 0.24 0.24
13-Jul 2006 7.81 2 0.22 0.22
18-Jul 2006 7.42 2 0.21 0.21
21-Jul 2006 7.27 2 <0.2 0.10
24-Jul 2006 7.87 3 0.31 0.31
27-Jul 2006 7.54 2
2-Aug 2006 8.12 1 0.54 0.54
4-Aug 2006 7.88 1 0.52 0.52
8-Aug 2006 7.97 2 0.44 0.44
10-Aug 2006 7.43 1 0.98 0.98
14-Aug 2006 7.38 6 0.34 0.34
15-Aug 2006 7.25 6 0.28 0.28
17-Aug 2006 7.51 2 0.77 0.77
20-Aug 2006 6.68 9 0.56 0.56
23-Aug 2006 7.37 2 0.61 0.61
24-Aug 2006 7.25 2 0.54 0.54
29-Aug 2006 7.98 1 0.41 0.41
30-Aug 2006 8.20 1 0.30 0.30
1-Sep 2006 6.02 19 <0.2 0.10
6-Sep 2006 7.30 13 0.20 0.20
7-Sep 2006 6.81 4 0.29 0.29
14-Sep 2006 7.08 9 0.22 0.22
15-Sep 2006 7.37 3 0.26 0.26
18-Sep 2006 7.99 1 0.38 0.38
1

Unimin Apr 2006 to 2008
Upstream
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data "where<.2=0.1
Su NTU mg/L m /l
19-Sep 2006 7.92 1 0.55 0.55
27-Sep 2006 8.66 1 0.58 0.58
29-Sep 2006 7.44 2 0.62 0.62
3-Oct 2006 7.62 2 0.69 0.69
6-Oct 2006 7.37 1 0.72 0.72
11-Oct 2006 7.09 1 0.54 0.54
12-Oct 2006 7.26 1 0.36 0.36
16-Oct 2006 7.38 1 0.63 0.63
17-Oct 2006 7.05 9 0.63 0.63
19-Oct 2006 7.21 2 0.36 0.36
24-Oct 2006 7.09 1 0.33 0.33
25-Oct 2006 7.17 1 0.68 0.68
31-Oct 2006 7.37 1 0.29 0.29
1-Nov 2006 7.29 2 0.48 0.48
6-Nov 2006 6.84 1 0.32 0.32
7-Nov 2006 7.17 1 0.31 0.31
9-Nov 2006 6.98 8 0.23 0.23
14-Nov 2006 7.18 5 0.20 0.20
16-Nov 2006 6.84 30 0.26 0.26
22-Nov 2006 6.95 1 0.34 0.34
23-Nov 2006 7.01 1 0.36 0.36
27-Nov 2006 6.97 1 0.27 0.27
28-Nov 2006 6.88 1 0.26 0.26
30-Nov 2006 7.24 2 0.38 0.38
6-Dec 2006 7.23 1 0.51 0.51
8-Dec 2006 6.84 1 0.43 0.43
13-Dec 2006 7.32 2 1.11 1.11
14-Dec 2006 7.27 3 1.34 1.34
18-Dec 2006 7.40 1 0.48 0.48
19-Dec 2006 7.41 1 0.33 0.33
22-Dec 2006 7.28 1 0.57 0.57
26-Dec 2006 7.20 5 <0.2 0.10
28-Dec 2006 7.18 2 0.24 0.24
2-Jan 2007 6.94 6 <0.2 0.10
3-Jan 2007 6.88 4 0.20 0.20
11-Jan 2007 6.80 2 0.26 0.26
12-Jan 2007 6.94 2 0.28 0.28
16-Jan 2007 7.44 2 0.29 0.29
18-Jan 2007 7.16 1 0.37 0.37
23-Jan 2007 7.12 2 0.24 0.24
26-Jan 2007 7.10 1 0.29 0.29
30-Jan 2007 7.10 1 0.26 0.26
2-Feb 2007 7.08 1 0.44 0.44
6-Feb 2007 7.11 1 0.49 0.49
8-Feb 2007 6.72 1 0.47 0.47
13-Feb 2007 7.18 1 0.33 0.33
15-Feb 2007 6.90 1 0.44 0.44
2

Unimin Apr 2006 to 2008
Upstream
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data "where<.2=0.1
SU NTU mg/L m /l
19-Feb 2007 6.89 1 0.48 0.48
22-Feb 2007 6.84 2 0.50 0.50
27-Feb 2007 7.81 2 0.43 0.43
28-Feb 2007 7.52 1 0.40 0.40
2-Mar 2007 6.91 18 0.21 0.21
6-Mar 2007 7.18 1 0.31 0.31
8-Mar 2007 7.33 2 0.44 0.44
13-Mar 2007 7.80 1 0.21 0.21
15-Mar 2007 7.87 1 0.26 0.26
20-Mar 2007 7.28 1 <0.2 0.10
22-Mar 2007 7.91 1 0.26 0.26
27-Mar 2007 8.31 3 <0.2 0.10
30-Mar 2007 7.76 3 0.24 0.24
2-Apr 2007 7.80 2 0.49 0.49
3-Apr 2007 7.14 2 0.68 0.68
10-Apr 2007 7.68 1 0.49 0.49
12-Apr 2007 7.53 1 0.64 0.64
18-Apr 2007 7.25 1 0.68 0.68
19-Apr 2007 7.28 2 0.39 0.39
23-Apr 2007 6.97 1 0.64 0.64
24-Apr 2007 6.78 1 0.74 0.74
30-Apr 2007 7.39 1 <0.2 <0.2
2-May 2007 7.56 1 0.53 0.53
8-May 2007 7.50 1 0.19 0.19
10-May 2007 7.67 2 0.51 0.51
14-May 2007 7.49 1 0.34 0.34
14-May 2007 7.37 1 0.31 0.31
17-May 2007 7.36 2 0.63 0.63
22-May 2007 7.82 3 0.35 0.35
24-May 2007 7.21 2 0.41 0.41
29-May 2007 7.14 2 0.37 0.37
31-May 2007 7.59 2 0.65 0.65
4-Jun 2007 7.11 4 0.35 0.35
5-Jun 2007 7.32 2 0.41 0.41
14-Jun 2007 7.31 3 0.60 0.60
15-Jun 2007 7.28 3 0.37 0.37
18-Jun 2007 7.56 3 <0.2 0.10
22-Jun 2007 7.73 4 0.35 0.35
27-Jun 2007 7.09 12 0.89 0.89
28-Jun 2007 7.59 4 0.45 0.45
5-Jul 2007 7.32 3 1.40 1.40
6-Jul 2007 7.96 3 0.70 0.70
10-Jul 2007 7.82 4 0.40 0.40
13-Jul 2007 8.08 2 0.60 0.60
16-Jul 2007 7.05 2 1.10 1.10
17-Jul 2007 8.18 2 0.88 0.88
25-Jul 2007 6.80 38 0.63 0.63
3

Unimin Apr 2006 to 2008
Upstream
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data "where<.2=0.1
SU NTU mg/L m /l
26-Jul 2007 7.01 26 0.86 0.86
31-Jul 2007 7.12 5 0.76 0.76
2-Aug 2007 6.17 21 0.28 0.28
6-Aug 2007 7.87 4 0.57 0.57
10-Aug 2007 7.61 4 0.56 0.56
14-Aug 2007 8.18 3 1.05 1.05
17-Aug 2007 7.77 3 1.33 1.33
21-Aug 2007 6.84 2 1.35 1.35
23-Aug 2007 6.61 3 1.07 1.07
27-Aug 2007 7.50 4 1.02 1.02
28-Aug 2007 7.51 2 0.50 0.50
30-Aug 2007 8.04 2 1.17 1.17
4-Sep 2007 8.08 2 0.74 0.74
6-Sep 2007 7.80 1 0.61 0.61
9-Sep 2007 8.09 2 0.52 0.52
13-Sep 2007 7.87 1 0.54 0.54
18-Sep 2007 7.88 1 0.64 0.64
21-Sep 2007 8.53 1 0.62 0.62
22-Sep 2007 8.74 1 0.27 0.27
23-Sep 2007 8.10 1 0.36 0.36
25-Sep 2007 8.51 1 0.60 0.60
2-Oct 2007 8.72 1 0.57 0.57
4-Oct 2007 8.70 1 0.38 0.38
8-Oct 2007 8.30 2 0.45 0.45
9-Oct 2007 8.30 2 0.45 0.45
11-Oct 2007 8.37 1 0.41 0.41
16-Oct 2007 8.48 1 1.14 1.14
18-Oct 2007 8.17 1 0.80 0.80
23-Oct 2007 7.27 2 0.53 0.53
25-Oct 2007 7.06 1 0.46 0.46
29-Oct 2007 7.75 1 0.28 0.28
30-Oct 2007 7.82 1 0.68 0.68
1-Nov 2007 7.74 1 0.98 0.98
5-Nov 2007 7.56 1 0.87 0.87
10-Nov 2007 7.63 1 0.76 0.76
12-Nov 2007 7.43 1 0.92 0.92
15-Nov 2007 7.47 1 0.82 0.82
19-Nov 2007 7.86 1 1.07 1.07
22-Nov 2007 7.41 1 0.71 0.71
28-Nov 2007 7.38 1 0.45 0.45
30-Nov 2007 7.38 1 0.61 0.61
5-Dec 2007 7.80 1 0.84 0.84
7-Dec 2007 7.79 1 0.44 0.44
10-Dec 2007 7.85 1 0.42 0.42
11-Dec 2007 7.85 1 0.46 0.46
18-Dec 2007 7.64 1 0.27 0.27
21-Dec 2007 7.67 1 0.42 0.42
4

Unimin Apr 2006 to 2008
Upstream
50 ft upstream of discharge
Transformed
Date Year pH Turbidity Fluoride Fluoride Data "where<.2=0.1
SU NTU mg/L m /l
26-Dec 2007 7.43 1 0.28 0.28
28-Dec 2007 7.58 1 0.24 0.24
31-Dec 2007 7.51 10 0.32 0.32
3-Jan 2008 7.70 2 0.76 0.76
9-Jan 2008 7.54 2 0.81 0.81
11-Jan 2008 7.51 2 0.68 0.68
15-Jan 2008 7.72 3 0.36 0.36
18-Jan 2008 7.67 1 0.76 0.76
23-Jan 2008 7.67 2 0.24 0.24
26-Jan 2008 7.89 1 0.67 0.67
29-Jan 2008 7.28 1 0.34 0.34
5-Feb 2008 7.57 30 0.43 0.43
7-Feb 2008 7.48 10 0.20 0.20
11-Feb 2008 7.48 1 0.21 0.21
12-Feb 2008 7.48 1 0.25 0.25
20-Feb 2008 7.42 4 0.20 0.20
22-Feb 2008 7.15 3 0.24 0.24
26-Feb 2008 7.08 2 0.20 0.20
28-Feb 2008 7.46 3 0.25 0.25
3-Mar 2008 7.36 1 0.21 0.21
6-Mar 2008 7.41 1 0.23 0.23
11-Mar 2008 7.37 3 0.20 0.20
13-Mar 2008 7.68 2 0.20 0.20
19-Mar 2008 7.83 3 0.20 0.20
24-Mar 2008 7.53 2 0.20 0.20
25-Mar 2008 7.73 1 0.20 0.20
30-Mar 2008 7.81 2 0.54 0.54
1.07 95th percentile=
0.48 Average=
5

DA= 1.61 mi2
Facility: Central Care 7Q10s =0.21 cis
Discharge to: UT to Stewarts Creek 7Q10w=0.34 cfs
v
/V�
Residual Chlorine onia as NH3
summer)
7Q10(CFS) 90 7Q10 (CFS) 90
DESIGN FLOW (MGD) 2 DESIGN FLOW (MGD) 2
DESIGN FLOW (CFS) 3.1 DESIGN FLOW (CFS) 3.1
STREAM STD (UG/L) 1.8 STREAM STD (MG/L) 1.8
UPS BACKGROUND LEVEL(UG/L) 1.07 UPS BACKGROUND LEVEL(MG/L) 1.07
IWC (%) 3.33 IWC(%) 3.33
Allowable Conc.(ug/1) 510.55 Allowable Concentration (mg/1) 22.99
Amm ' as NH3
(winter)
7Q10(CFS) 0.34
Fecal Limit 20011 00m DESIGN FLOW (MGD) 2
Ratio of 29.0:1 DESIGN FLOW (CFS) 3.1
STREAM STD(MG/L) 1.8
UPS BACKGROUND LEVEL (MG/L) 0.22
IWC (%) 90.12
Allowable Concentration (mg/1) 1.97
For Minor domestic-type facilities:
Minimum of 2 mg/I (summer)NH3-N; 4 mg/I (winter) NH3-N
Chlorine:
Residual chlorine must be capped at 28 ug/I to protect for acute toxicity effects

IWC Calculations
UNIMIN - Red Hill
NC0085839
Prepared By:Jim McKay, Eastern NPDES Program
Enter Design Flow(MGD): 2
Enter s7Q10(cfs): 90.7
Enter w7Q10(cfs): 125.6
Residual Chlorine Ammonia(NH3 as N)
(summer)
7Q10(CFS) 90.7 7Q10(CFS) 90.7
DESIGN FLOW (MGD) 2 DESIGN FLOW (MGD) 2
DESIGN FLOW (CFS) 3.1 DESIGN FLOW (CFS) 3.1
STREAM STD (UG/L) 17.0 STREAM STD(MG/L) 1.0
UPS BACKGROUND LEVEL(1 0 UPS BACKGROUND LEVEL 0.22
IWC (%) 3.30 IWC (%) 3.30
Allowable Conc. (ug/I) 514 Allowable Conc. (mg/1) 23.8
Ammonia(NH3 as N)
(winter)
7Q10(CFS) 125.6
Fecal Limit 200/100ml DESIGN FLOW (MGD) 2
(If DF >331; Monitor) DESIGN FLOW (CFS) 3.1
(If DF<331; Limit) STREAM STD (MG/L) 1.8
Dilution Factor(DF) 30.26 UPS BACKGROUND LEVEL 0.22
IWC (%) 2.41
Allowable Conc. (mg/1) 65.8
NPDES Servor/Current Versions/IWC
8/12/2008

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NCO085839
Facility Information
Applicant/Facility Name: Unimin Corporation-Red Hill Quartz Plant
Applicant Address: P.O.Box 588,Hwy 226N Spruce Pine NC 28777
Facility Address: Highway 197N Bakersville NC 28705
Permitted Flow 2.0 m d
Type of Waste: Industrial
Facility/Permit Status: Modification
Facility Classification Ph sical/Chen*al Class II
County: Mitchell
Miscellaneous
Receiving Stream: North Toe River Regional Office: Asheville
Stream Classification: C Trout USGS To o Quad: C9SE
303(d) Listed?: No* Permit Writer: Jim McKay
Subbasin: 04-03-06 Date: 12/19/2007
Drainage Area mit : 340
Summer 7Q10 cfs 90.7
Winter 7Q 10 (cfs): 125.6
Average Flow cfs : 510
IWC (%): 3.3%
Primary SIC Code: 1499
SUMMARY OF FACILITY INFORMATION AND WASTELOAD ALLOCATION
Unimin Corporation is requesting a permit modification for its Red Hill Quartz Plant to increase
flow to 2.0 mgd from the current 0.682 mgd in order to increase production. The Red Hill
Quartz Plant does extraction and mineral processing to produce high purity quartz. No mining
is done at this site. The facility is permitted to discharge into the North Toe River, class C-
Trout waters, in French Broad River Basin. Outfall 001 discharges process water. Outfall
002 is an intermittent stormwater discharge.
The wastewater treatment plant consists of:
• Mix-reactor tanks;
• Lime and polymer feed systems;
• thickener;
• drum filter
• pH adjustment and
• flow measurement.
Processes for treatment include neutralization, precipitation, settling, vacuum filtering of solids
and disposal of solids by land filling.
RECEIVING STREAM INFORMATION:
I
9
section of the North Toe River upstream of this facility is listed on North Carolina's 2006-
03(d) list, based on turbidity and riparian area loss. The segment also has a bioclassification
rating of Fair. The Red Hill Quartz Plant is located approximately 15 miles downstream of the
impaired segment of the North Toe River§yrhe North Toe River downstream of he facility has a
ion classification rating o Good. According to the US Fish and Wildlife office, at stretch of
North Toe River is designated critical habitat for the federally endangered Appalachian elktoe.
We have records of the federally endangered Alasmidonta raveneliana (Appalachian elktoe), the
state listed Lampsilis fasciola (Wavy rayed lamp mussel), and Etheostoma acuticeps
(Sharphead darter) listed as a federal species of concern all occuring in that reach of the North
Toe.
Unimin Corporation—Red Hill Facility Sheet
NPDES Modification NCO085839
Page 1

At this time, DWQ proposes no changes to the previously developed load allocations. Neither
the impairment nor the turbidity violation is directly attributable to this discharges.
INSTREAM MONITORING:
Upstream: Upstream at least 50 feet
Downstream: Downstream at least 300 feet.
Parameters: Fluoride, Turbidity, pH
The fluoride instream standard of 1.8 mg/ L was exceeded both upstream and downstream of
the discharge in 2005, 2006 and 2007,with 9 instances of either upstream, downstream or
both in 2005, 15 instances in 2006, and only 3 instances in 2007 through August.
A review of instream data for 2005, 2006, and 2007 showed some exceedances of the turbidity
standard of 10 NTU for trout streams. These exceedances occurred 19 times in 2005, 5 times
in 2006, and 5 times in 2007 through August. In these instances, the standard was exceeded
both upstream and downstream of the Red Hill facility.
TOXICITY TEST RESULTS:
ExistinQuarterly Chronic P/F, 1.2% Ceriodaphnia test. JAN APR JUL OCT
Facility has passed all tests since January 2002 except for one failure in January 2004. It was
followed by two passed tests in Feb. and March 2004 and all subsequent tests through July
2007.
Recommendation: Renewal of quarterly chronic test @ 3.3% based on increased flow.
COMPLIANCE REVIEW:
Facility has been in compliance with nearly all permit limits consistently in 2005, 2006 and
2007 YTD. One NOV was issued in November 2006 for exceeding the TSS Limit.
Facility is no longer required to conduct Priority Pollutant analysis based on category of
discharger.
Confidential information in application indicates that chlorine is added for disinfection of intake
water. A TRC limit of 28 ug/L was added on permit renewal in November, 2006 based on trout
classification of receiving stream and NC standard for TRC. An 18 month compliance schedule
was given, the TRC limit begins June 1, 2008.
PROPOSED CHANGES:
■ At the request of the permittee, flow is increased to 2.0 mgd from 0.682 mgd. Fluoride
and TSS concentration limits were kept the same at 27 mg/ L and 25 mg/ L
respectively. The new mass limits are 450 lb/ Day monthly average for TF and 417 lb/
day mon thl average for TSS.
C <,uA CXoJ E'�n,c,�f eti�rkt ->�,rnl, (.tea
PROPOSED SCHEDULE FOR PERMIT ISSU CE: /'0
Draft Permit to Public Notice: 12/19/2007
Permit Scheduled to Issue: (Tentative) 02/04/2008
Projected Effective Date of Permit: 03/01/2008
STATE CONTACT:
If you have any questions on any of the above information or on the attached permit, please
contact Jim McKay at [phone] ext. 595.
NAME: DATE:
Unimin Corporation—Red Hill Facility Sheet
NPDES Modification NC:O085839
Page

w
• REGIONAL OFFICE COMMENT:
NAME• DATE:
REGIONAL SUPERVISOR:
NAME• DATE•
NPDES SUPERVISOR COMMENT:
NAME: DATE:
Unimin Corporation—Red Hill Facility Sheet
NPDES Modification NCO085839
Page 3

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Uflimin
Env*vnmentd M`lirs Department
Unimin Corporation
136 Crystal Drive*Spruce Pine,NC 28777
(PHONE)828/766-6081•(FA} 828/765-4755
May 30, 2007
CERTIFIED MAIL !1D)
RETURN RECEIPT REQUESTED
:, -�
:11
2007
Mr. Charles H. Weaver,Jr.NCDENR/Water Quality/NPDES Unit QUALITY
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Subject: NPDES Modification Request for Unimin Corporation—Red Hill Facility
NPDES Permit Nos. NC0085839, Mitchell County, North Carolina
Dear Mr. Weaver:
Please accept this letter as a request for modification of Unimin Corporation —Red
Hill Facility's NPDES No. NCO085839 to allow for increased production. With this
modification, Unimin requests that the permitted average flow be increased from 0.682
MGD to 2.0 MGD and allow for the monthly average total suspended solids limit to be
increased from 142 lb/day to 417 lb/day based on the 25 mg/1 30-day average effluent
limitation contained in 40 CFR 436. In addition, Unimin requests that the monthly average
total fluoride limit to be increased from 200 lb/day to 450 lb/day based on best available
control technology at 27 mg/l. The requested levels are sufficient to protect water quality
and are well below available concentrations at this point in the river.
Enclosed please find one signed original and two copies of EPA Form 1 and EPA
Form 2C, proposed waste treatment plant flowsheet, and a major modification permit
processing fee of $400.00. Please note there have been no changes to the waste treatment
plant since issuance of the latest permit.
As this project is very urgent, I am grateful for all efforts you can make to expedite
this permit approval.
Please note that portions of the applications have been stamped Confidential.
Unimin Corporation is requesting that this information be treated as confidential and
thereby protected from public disclosure.
Unimin believes that such information if made public, would divulge technology,
methods and processes entitled to protection as trade secrets of Unimin Corporation.
Accordingly, we are requesting confidentiality of this information under State Statute 143-
215.3.

A
Mr.Charles H.Weaver,Jr.
May 30,2007
Page 2
In support of this request, Unimin Corporation herein avers:
A. The production of high purity quartz is a highly competitive industry in which
market position is very much dependent on possession of the latest technology and
process development.
B. The processes and technology associated with Unimin's production of high purity
quartz have been consistently treated by Unimin in its operating policies,procedures
and practices as proprietary and confidential trade secrets.
C. Unimin believes that such processes and technology are in its sole possession and
are not generally available to Unimin's competitors or the public.
D. Such confidential processes and technology which have been developed at great
time and expense to Unimin are the property of Unimin and represent a great value
and competitive advantage to its market position and are an integral part of
Unimin's continuous quartz production operation.
E. The unprotected divulgence of such confidential information would result in an
irreparable harm to the competitive position of Unimin Corporation in this market.
If you have any questions regarding this matter, require further information, or
anyway I can assist to expedite the modification approval please do not hesitate to contact
me at [phone] ext 13. Thank you in advance for your efforts to help accelerate
issuance of the permit
Sincerely,
Jeffrey2//P
S. Ferguson,P.E.
Environmental Engineer
UNIMIN CORPORATION
Enclosures
c: EA Hiles,Mike Jussila,Kid Kuchta(cover letter),Bruce Perkins

DI BaCkflutn DC-32
FOR UME UNLOADING STA, Voarum FAtsr Roramstric Lsgs
42.600 lb/day
Fl«Droin. CY-02
19asn Cdumn Ovsr6or VrBN— VIBRATORS(3)
I I SC-32
I
Rsaotor MuiHv Drain
27
u I BL-02 Fram Ex1.69 cr-01 and of-o
Fum.$rrabner wa.te f
TA-62 1 DF-02
TA—61
F— Thiosullats Trsotmsnt
I
r �
T
7.9 TPH Shcds
92.]50 b/day dids
300 GPM I 0 38%sdiM
1.3 TPN$aiaa
61,940 Ib/doy sdids
O 365 Shcds
f VP-33 — —+—
TA-63 TA-64 3.2 TPM 5o0dN
TA-60 154,,90 lb/day solids
®RK
0 38%Shcds
SOLIDS TO TRUCK VIA
FRONT END LOADER
I I
PU-70 M AG-35 pH� PU-77 PU-78 � 0100 OPM
00 0
AG-36
M M pH PU-76dt
MT-35 ��
PU-72 Stranco Pump
MT-36 Floc SUMP
Y
PU-71
Thickener Area Sump TH-02
70' Diameter Static Thickener
M M pH
ra
PU-44 L
Too GPM
PU-73
Emergency Pon From Ex sting T1—Cl
sm GPM
I �
J 1200 GPM
4
Culligan Backnusn 150 CPM pH
PU-74 PU-75 Porsholl TO RIVER
Green — Existing L -- Emergency Pond Di a son
Design — 1,200 GPM
Brown — New �-- � lume Psrmlt— 2.0 MGD Monthly DaAy Awrogs
-- _ DRAWN BY DGS 5/29/07 uniminawn-MExpansion Waste Circuit scALE PlmcT NE1xax 45-07-DI
BY' DRAWING NO. REV.
CHECKED BY,
--
APPROVE DI fy.,I.c .a.��»'a I,k+ 'ann°►°mow+ n +
Red Hill Plant 45-07-01-F09 D
REFERENCE WAVEGS REFERETCE MAVWLNo. Br DATE REVISIONS APPROVED