NC0089168_Draft Permit_20130709

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NCDER
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Pat McCrory Thomas A. Reeder John E. Skvarla, III
Governor Acting Director Secretary
July 9, 2013
Mr. Mark Nuhfer, Chief
Municipal and Industrial NPDES Section
US EPA Region 4
61 Forsyth Street, SW
Atlanta, GA 30303-8960
Subject: Martin Marietta Materials,Inc.
Draft Final NPDES Permit/Vanceboro Quarry
Permit No.NCO089168
Beaufort County
Class I Facility
Dear Mr.Nuhfer:
Enclosed with this letter is a copy of the draft Final NPDES permit,Revised Fact Sheet, and
Hearing Officer Report for the subject facility for your review. In your comment letter dated
May 20, 2013,EPA requested a fifteen(15)business day review prior to issuing the Final
permit. Listed below is a summary of proposed changes for the Final Permit,based on
consideration of EPA comments,public hearing process, and the Division Director's
consideration of the Hearing Officer recommendations:
1. Addition of Monthly Average effluent iron limit of 1.0 mg/1
2. Addition of new Special Condition A(7)-Effluent Data Characterization
3. Addition of monthly effluent nutrient monitoring (TN,TP)
4. Addition of monthly effluent temperature monitoring
5. Addition of monthly instream monitoring(pH, salinity,temperature,turbidity) at two
downstream stations
6. Modification of effluent pH limit range from 6.0-9.0 to 5.5-8.5
7. Modification of flow limits from Monthly Average (4.5 MGD at each outfall)to Daily
Maximum(6.0 MGD at each outfall)
1617 Mail Service Center,Raleigh,North Carolina 27699-1617
Location:512 N.Salisbury St.Raleigh,North Carolina 27604
Phone:[phone]\FAX:[phone]
Internet:www.ncwaterguality.org One
An Equal Opportunity\Affirmative Action Employer NorthCarolina
AWMrallY

Mr. Mark Nuhfer
July 9, 2013
Page 2 of 3
8. Modification of Special Condition A(6)-Benthic Monitoring Requirement-to include
approval of Sampling Plan by DWQ prior to commencement of sampling.
Listed below are our specific responses to the EPA comment letter,by topic. The Fact Sheet has
also been revised to reflect these considerations.
Reasonable Potential Analysis (RPA)
• As discussed by phone on June 18,2013,the data set for a new discharge is limited to
one groundwater sample collected from the Castle Hayne aquifer(untreated) and one
dewater effluent sample collected from a similar limestone quarry operation(Clark
Quarry). NC does not routinely conduct a statistical RPA evaluation for one data point,
and our most recent Monitoring/RPA procedures update (dated July 15, 2010, attached)
reserves a statistical RPA procedure to data sets> 8 samples, consistent with EPA's
Technical Support Document(1991).
• Based on review of the data as well as other State NPDES permits for limestone quarry
operations,the key pollutants of concern associated with this proposed dewatering
discharge include turbidity,pH, and iron. These parameters were also identified as key
parameters via the public input process. The draft permit included monitoring and limits
for pH and turbidity,while iron was a monitoring-only condition. Iron was found in high
concentration in the Castle Hayne groundwater aquifer (21.8 mg/1),but at much lower
levels (0.587 mg/1)in the treated effluent from the Clark Quarry operation. The NC
chronic Action Level for iron is 1.0 mg/l,based on protection for aquatic life. In lieu of
the Action Level Policy with associated toxicity testing, and given the local concerns
expressed about high iron concentrations in groundwater, an iron limit of 1.0 mg/1 has
been added to the Final permit.
• Given the lack of site-specific effluent data for the proposed discharge, a new Special
Condition A(7)has been added to the Final permit,requiring the permittee to complete
and submit items V and VI of Application Form 2C within one(1)year of
commencement of discharge. The permit may be reopened and modified if there are any
parameters detected at levels of concern.
Effluent Limitations
• The Division believes that the effluent limits in the Final permit will be protective of
surface water quality standards.
• Federal Effluent Guidelines for the crushed stone subcategory of mineral mining and
processing(40 CFR 436.22) establish pH limits range of 6.0 to 9.0 based on technology.
Both the Federal Effluent Guidelines and State Water Quality Standards provide for a
downward adjustment in pH if the receiving waterbody is less than 6.0. Upon further
review,the pH limit range for the draft Final permit has been lowered to pH 5.5-8.5.

Mr. Mark Nuhfer
July 9, 2013
Page 3 of 3
Antidegradation Policy
• The Fact Sheet documents the efforts to consider non-discharge alternatives pursuant to
15A NCAC 2H.0105(c)(2).
• The Public Notice indicated that the proposed discharge may affect future discharge
allocations.
• The NC Antidegradation Policy at 15A NCAC 2B.0201 does not require an evaluation of
socioeconomic considerations. However,the Revised Fact Sheet does include a statement
regarding the anticipated number of jobs created by the quarry and the local need for
aggregate material.
• The Revised Fact Sheet includes a statement that the level of water quality necessary to
protect the existing uses will be maintained and protected.
If you have questions concerning this draft Final permit,please contact me at(919) 807-6390 or
by email at [e-mail].
Sincerely,
(jom Belnick
NPDES Unit Supervisor
Attachments: Draft Final Permit
Revised Fact Sheet
Hearing Officer Report
Monitoring Frequency Policy for Toxic Substances (July 15,2010)
Hardcopy: NPDES Unit File NC0089168
Email Copy: Matt Matthews, Surface Water Protection Section
Jeff Poupart, Point Source Branch
Amy Adams,Washington Region SWPS

NPDES Permit NCO089168
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
NPDES 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,
Martin Marietta Materials, Inc.
is hereby authorized to discharge wastewater from a facility located at:
Vanceboro Quarry
Off of Welbourn Road near Vanceboro
Weyerhaeuser Property
Beaufort County
to receiving waters designated as unnamed tributaries to Blounts Creek in the Tar-Pamlico River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I,
II, and III hereof.
This permit shall become effective
This permit and authorization to discharge shall expire at midnight on
Signed this day:
DRAFT FINAL FOR EPA REVIEW
Thomas A. Reeder, Acting Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 1 of 6

NPDES Permit NCO089168
SUPPLEMENT TO PERMIT COVER SHEET
The exclusive authority to operate and discharge from this facility arises under the permit conditions,
requirements, terms, and provisions included herein.
Martin Marietta Materials, Inc.
is hereby authorized to:
1. Discharge mine dewatering and comingled stormwater at the locations specified on the attached
map from two pit clarification ponds, each with an approximate volume of 50 million gallons, through
outfall 001 and outfall 002 into an unnamed tributary of Blounts Creek, which is classified as C-
Swamp NSW waters in the Tar-Pamlico River Basin.
Page 2 of 6

NPDES Permit NCO089168
PART
A (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 001)
During the period beginning on the effective date of the permit and lasting until expiration, the permittee is authorized
to discharge from outfall 0011. Such discharges shall be limited and monitored by the permittee as specified below:
DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
PARAMETER Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location s
Flow 3 6.0 MGD Continuous Recording E
Total Suspended Solids Monthly Grab E
Total Iron 1.0 mg/I ---- Monthly Grab E
Turbidity 4 Monthly Grab E
Variable Grab (U, D1)4
Settleable Solids 0.1 ml/L 0.2 ml/L Monthly Grab E
Total Nitrogen Monthly Grab E
Total Phosphorus Monthly Grab E
Temperature (C) Monthly Grab E
pH Between 5.5 and 8.5 standard units Monthly Grab E
pH Monthly Grab D1, D2
Salinity Monthly Grab D1, D2
Temperature ( C) Monthly Grab D1, D2
Turbidity Monthly Grab D1, D2
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR FOAM VISIBLE IN OTHER THAN TRACE AMOUNTS.
NOTES:
1. This outfall discharges mine dewatering and comingled stormwater.
2. Sample Locations: E — Effluent, U — Upstream near the intersection of Blounts Creek and Chuck
Road., D1 — Downstream after the convergence of the flows from the two outfalls in Blounts Creek,
from the access location off of Harper Road. D2- Downstream in Blounts Creek at the NC-33 bridge
crossing.
3. Total flow volume shall be recorded by a continuous flow measurement instrument. Alternatively,
pump curves and pump logs may be used as a means to calculate flow volume.
4. The discharge shall not cause the turbidity of the receiving waters to exceed 50 NTU. If the turbidity
exceeds this level due to natural background conditions, the discharge level cannot cause any
increase in the turbidity in the receiving waters. Instream turbidity monitoring shall not be required
unless effluent turbidity exceeds 50 NTU. If effluent turbidity exceeds 50 NTU, instream monitoring
shall be conducted weekly during the months of June, July, August, and September and monthly
during the remaining months of the year until effluent turbidity is less than 50 NTU.
Page 3 of 6

NPDES Permit NCO089168
A (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002)
During the period beginning on the effective date of the permit and lasting until expiration, the permittee is authorized
to discharge from outfall 0021. Such discharges shall be limited and monitored by the permittee as specified below:
DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
PARAMETER Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location z
Flow 3 6.0 MGD Continuous Recording E
Total Suspended Solids Monthly Grab E
Total Iron 1.0 mg/I --- Monthly Grab E
Turbidity 4 Monthly Grab E
(U, D1)4
Settleable Solids 0.1 ml/L 0.2 ml/L Monthly Grab E
Total Nitrogen Monthly Grab E
Total Phosphorus Monthly Grab E
Temperature ( C) Monthly Grab E
pH Between 5.5 and 8.5 standard units Monthly Grab E
pH Monthly Grab D1, D2
Salinity Monthly Grab D1, D2
Temperature ( C) Monthly Grab D1, D2
Turbidity Monthly Grab D1, D2
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR FOAM VISIBLE IN OTHER THAN TRACE AMOUNTS.
NOTES:
1. This outfall discharges mine dewatering and comingled stormwater.
2. Sample Locations: E — Effluent, U — Upstream near the intersection of Blounts Creek and Chuck
Road., D1 — Downstream after the convergence of the flows from the two outfalls in Blounts Creek,
from the access location off of Harper Road. D2- Downstream in Blounts Creek at the NC-33 bridge
crossing.
3. Total flow volume shall be recorded by a continuous flow measurement instrument. Alternatively,
pump curves and pump logs may be used as a means to calculate flow volume.
4. The discharge shall not cause the turbidity of the receiving waters to exceed 50 NTU. If the turbidity
exceeds this level due to natural background conditions, the discharge level cannot cause any
increase in the turbidity in the receiving waters. Instream turbidity monitoring shall not be required
unless effluent turbidity exceeds 50 NTU. If effluent turbidity exceeds 50 NTU, instream monitoring
shall be conducted weekly during the months of June, July, August, and September and monthly
during the remaining months of the year until effluent turbidity is less than 50 NTU.
Page 4 of 6

NPDES Permit NCO089168
A (3) PUMPING OPERATION AND MONITORING PLAN
The permittee shall secure an approved pumping operation and monitoring (O&M) plan. The pumping O&M
plan shall include, but is not limited to, the following:
• A detailed site plan showing wetlands, ditches, well placements, pits, borrow areas, overburden storage,
stormwater controls/BMPs, vehicle maintenance areas, total drainage area, and access/haul roads,
• Groundwater monitoring strategies to demonstrate the effects of pumping,
• Detailed plans to maintain the surrounding hydrology that protects the affected streams and wetlands
and the respective monitoring to demonstrate compliance, and
• The pumping regime deemed necessary to protect affected streams and wetlands.
Approval of the pumping O&M Plan by the Division is required prior to the commencement of mining
operations. Submit three (3) copies of the Pumping O&M Plan to the following address:
North Carolina Division of Water Quality
Surface Water Protection Section/NPDES Complex Unit
1617 Mail Service Center
Raleigh, N.C. 27699-1617
A(4) BEST MANAGEMENT PRACTICES (BMPs)
The permittee shall maintain stormwater BMPs for mine excavation and disturbance areas, and any other
areas associated with mining or vehicle maintenance activities. Appropriate BMPs should be used to divert,
infiltrate, reuse, or otherwise manage stormwater runoff in a manner that reduces pollutants in stormwater
discharges from each outfall. Any stormwater controls shall be regularly inspected.
BMPs shall include a preventative maintenance program, which shall ensure equipment used during
mining activities will be operated and maintained to prevent pollution of the surface water or groundwaters
of the state. Fuels, lubricants, coolants, hydraulic fluids, and other petroleum products shall not be
discharged on the ground or into surface waters. Spilled fluids shall be cleaned up to the maximum extent
practicable and properly disposed.
A (5) CHEMICAL TREATMENT
Martin Marietta Materials, Inc. is prohibited from applying any form of chemical treatment to this discharge,
or using any chemicals in the crushed stone production process, unless pre-approved by written
authorization from the Division. Flocculants evaluated by the Division may be used if administered in
accordance with maximum application doses.
A (6) BENTHIC MONITORING REQUIREMENT
In order to evaluate the biological impact of this discharge, the permittee shall perform benthic sampling
at four locations. All results shall be submitted to the NPDES Unit at least six months prior to the
expiration date of this permit. The locations shall be the same as those previously sampled in April 2011
by CZR Incorporated in support of the permittee's Section 401 application. They include the sites
designated BC, UT1, UT2, and UT3. Please refer to "Aquatic Habitat Assessment of the Upper
Headwaters of Blounts Creek in the Vicinity of a Potential Quarry Site near Vanceboro, Beaufort County,
NC" (August 2011).
Page 5 of 6

NPDES Permit NC0089168
Benthic sampling shall be performed by a laboratory certified for benthic assessments, using approved
sampling methods. All sampling procedures must be in accordance with the latest version of Standard
Operating Procedures for Collection and Analysis of Benthic M acroi nve rteb rates, by the Division of
Water Quality Environmental Sciences Section. Approval of a Benthic Sampling Plan by the Division is
required prior to commencement of benthic sampling. Submit the benthic sampling plan to the following
address:
North Carolina Division of Water Quality
Environmental Sciences Section/BAU
1621 Mail Service Center
Raleigh, N.C. 27699-1621
A (7). EFFLUENT DATA CHARACTERIZATION
Given the lack of site-specific effluent data for this new discharge, the Permittee shall complete and
submit items V and VI of EPA Application Form 2C within one (1) year of commencement of discharge.
The permit may be reopened and modified if there are any parameters detected at levels of concern.
Submit results to the following address:
North Carolina Division of Water Quality
Surface Water Protection Section/NPDES Complex Unit
1617 Mail Service Center
Raleigh, N.C. 27699-1617
Page 6 of 6