NC0025305_Fact Sheet_20121231

1
Receiving Stream:
\7
30Q2 (cfs)0
IWC %:
/WS IV, NSW
Average Flow (cfs):
Date:
Subbasin:_______
Drainage Area (mF):
Summer 7Q10 (cfs)
Winter 7Q10 (cfs):
0____
3/6/12
Applicant/Facility
Name:_____________
Applicant Address:
Facility Address:
Permitted Flow_____
Type of Waste:______
Facility/Permit Status:
County:
aneous________
Stream
Classification:
Index No._____
HUC:_________
303(d) Listed?
Regional Office:
State Grid / USGS
Quad:___________
Permit Writer:
Permit Writer:_____
_____________Outfall 001: Treated industrial wastewater
| 100%
Outfall 002: stormwater from east retention pond and accumulated sources
Outfall 003: stormwater from west retention pond and accumulated sources
DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES PERMIT NC0025305_________________________
_________Facility Information_____________________________
University of North Carolina at Chapel Ilill/UNC Cogeneration
facility________________________________________________
302 South Building CB // 1000; Chapel Hill, NC 27599-1000
501 West Cameron Ave. CB # 1855; Chapel Hill, NC 27599-1855
Outfall 001:0.0922 MGD_________________________________
100% industrial and stormwater____________________________
Class 1 /Active; Renewal________________
Orange County
___________Miscel
UT to Morgan
Creek___________
03-06-06_________
0.04_____________
0_______________
0
BACKGROUND
The UNC-Chapel Hill Cogeneration Facility uses natural gas, coal, fuel oil, or other approved
alternative fuel to produce steam which is used for campus heating and to drive a turbine for
campus electricity. The treated industrial wastewater mixes with domestic wastewater, air wash
wastewater, cooling tower blowdown, and demineralizer wastewater which is sent to Orange
Water and Sewer Authority (OWASA) by contract. Sources of industrial wastewater include coal
pile runoff, stormwater from the fuel oil containment area, and low-volume process wastewater.
If OWASA contracted flow was exceeded then on a short term bases the Permittee could
discharge excess treated industrial wastewater through Outfall 001.
An emergency once through/non-contact cooling water system that was never used is part of the
existing approved discharge to Outfall 001. This system has been removed.'
Outfalls 002 & 003 are designated stormwater outfalls. Outfalls 001, 002, and 003 flows collect
in a concrete vault and drain to an unnamed tributary into Morgan Creek, Cape Fear River Basin.
As a combined NPDES permit for treated industrial wastewater and stormwater, Bethany
Georgoulias from the stormwater permitting unit coordinated and reviewed all permit details
related to stormwater. As such, questions related to stormwater should be directed to Bethany
Georgoulias and/or the stormwater permitting unit. Preparing, formatting, and issuing of the
combined permit narrative and addressing the NPDES permit industrial requirements were
coordinated by Ron Berry, NPDES complex permitting unit.
Fact Sheet
NPDES NC0025305
Page 1 of 6
0^
16-41-2-(5.5)
03030002
No %
Raleigh
D22NE
Chapel Hill, NC
Ron Berry________
Bethany Georgoulias
0^'
NPDES Permit Files and renewal application
Cape Fear Basinwide Plan (2005)
EPA Sector-Specific Permit (2008, Sector O)
Natural Heritage Program’s Threatened and Endangered Species Database
Fact Sheet
NPDES NC0025305
Page 2 of 6
SECTION B: STORMWATER STRATEGY (Bethany Georgoulias)
Stormwater-related Documents Reviewed:
o
o
o
o
HISTORY
2006 - Issued current permit with new requirements for monitoring TKN and NO? + NO?, in
Outfall 001 pursuant to the Cape Fear River Basin permitting strategy. Provisional
narrative was added for Outfall 001 to cover emergency discharge of once through, non­
contact cooling water.
2011 - There was no discharge through Outfall 001 during this permit cycle. No data to review.
- The emergency piping configuration for once through cooling water was removed.
- New contract signed with OWASA to accept process wastewater in excess of permitted
flow.
- Bethany Georgoulias contacted the permittee on missing stormwater data and
documentation requirements for stormwater renewal. Follow up to clarify stormwater
sources previously undefined.
- Reviewed water balance and treatment operation with Permittee.
- Permit renewal put on hold to allow RRO to investigate thallium issues at OWASA that
may be originating from this facility.
INDUSTRIAL TREATMENT PROCESS
Miscellaneous industrial wastewater, coal pipe stormwater, fuel oil containment stormwater, and
process area stormwater are collected and sent to the industrial wastewater treatment facility. A
water/oil separator is used to capture any oil by-products before collecting the waste water in the
two 63,000 gallon equalization basins. The wastewater then flows through a series of treatment
tanks for acid and caustic adjustment, followed by mixing with a polymer before discharging
into settling tanks. After settling in the tanks, the treated wastewater is intermittently discharge
to the local utility OWASA. If necessary the treated wastewater can be diverted to Outfall 001.
STORMWATER CONTROL
There are two non-lined stormwater retention ponds on site. Stormwater can be either released
through an overflow or a manual drain value to Outfalls 002 & 003. The infiltration and
evaporation rates were sufficient to manage stormwater without any significant discharges.
Outfalls 002 & 003 also accumulate other local stormwater sources that may discharge.
SECTION A: INDUSTRAIL STRATEGY (Ron Berry)
Reasonable Potential Analysis (RPA)
There were no discharges during this permit cycle so an RPA was not performed. To ensure
correct monitoring and compliance for Outfall 001 parameters the measurement frequency was
defined as per discharge event per month.
OWASA data was reviewed and thallium exceeded the WQS. To investigate pollutants of
concern, arsenic, thallium, and selenium monitoring were added to Outfall 001.
Several technical corrections were made:
1. Supplement to Permit Cover Sheet operations, equipment, and outfalls narratives were
updated.
2. Latitude/longitude locations were amended/corrected to support both wastewater and
stormwater outfalls.
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Fact Sheet
NPDES NC0025305
Page 3 of 6
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o 40 CFR Subchapter N, Stormwater Effluent Guidelines
Stormwater Permit History:
This facility has a combined NPDES wastewater and stormwater permit. Generally DWQ has
been separating SW and WW permits more and more because of the increasing challenges and
complexities with keeping those together. However, because of the rare instances of wastewater
discharge (emergency only) and stormwater retention pond discharges (large design and
infiltration capacity), the Stormwater Permitting Unit (SPU) worked with NPDES WW staff to
incorporate updated stormwater requirements in the combined NPDES permit. During review,
DWQ learned there are other stormw'ater discharges that do not go to either of the retention
ponds. This may not have been clear to the permittee or DWQ in previous NPDES permit cycles.
The cument Basinwide Plan (2005) highlighted the Local Watershed Plan for Morgan Creek
(http://www.nceep.net/services/lwps/Morgan Creek/morgan.htm). UNC-Chapel Hill was a
participant in the Plan development. The Local Watershed Plan recommended restoration and
preservation projects through the implementation of 25 Best Management Practices to treat water
quality in 600 acres of priority sub-watersheds; 11 stream restoration projects to gain 28,000
linear feet of restored stream; and 137 priority preservation parcels to protect over 600 acres of
priority habitat.
The 2005 Basinwide Plan recommendations included continued monitoring of Morgan Creek,
and for DWQ to work with the Chapel Hill stormwater program to help identify stormwater
retrofit opportunities. The WARP project recommended retrofitting existing stormwater
discharges and preventing increased sedimentation to the watershed during future development.
Central Office Stormwater Permitting Unit Review Summary:
1. Impairment: This segment of Morgan Creek is not impaired; however, the segment
upstream is on the 303(d) list because of nitrate levels. This site is also located in the
Jordan Reservoir watershed, affected by excessive nutrient loading and subject to the
Jordan Lake Nutrient Strategy Rules (“Jordan Rules”). The reviewer is not
recommending nutrient monitoring at this time. The Jordan Rules, adopted in 2009, will
be phased in over the next several years. Controls for stormwater runoff will apply to
new and existing development. Future requirements of the rules will depend on the
success of local government implementation.
2. Threatened and Endangered: All species identified in NC Natural Heritage Program
Virtual Workroom databases were plants, not aquatic species. Approximate facility
location noted with arrow. See Figure 1.
Figure 1: Threatened and Endangered
3. Stormwater Effluent Guidelines: 40 CFR § 423 does contain effluent guidelines for coal
pile storage runoff, which is already addressed under the wastewater portion of this
permit.
4. EPA MultiSector General Permit: EPA’s 2008 MSGP requires iron (Fe) monitoring for
this industrial activity. However, iron is ubiquitous, and because we anticipate the
cunent NC water quality standard for iron to be removed when Triennial Review is
finalized, Fe is not proposed as a monitoring parameter in this draft permit.
5. Location: This site discharges stormwater through two stormwater discharge outfalls:
SDO 002 and 003. Those ‘‘outfalls” combine with the emergency wastewater outfall 001
in a junction box that then discharges through a line to the UT to Morgan Creek.
The stormwater ponds are not lined and infiltrate to some degree. Discharges from the
ponds are rare and only happen over the emergency spillways (and then to the ground) in
very large rain events (See discussions with permittee for more details). However, some
stormwater from industrial areas is routed to the junction at the tributary (i.e., does not
flow to the stormwater ponds). The site plan outlines red areas (and manholes are marked
red on site) where stormwater does not go to either pond. This may not have been clear
to the permittee or DWQ before, and sampling of this stormwater at the splitter box/pit
was not required by the previous permit (the stormwater outfalls were designated as the
pond outfalls). The stormwater from those areas must be sampled during this permit
term.
The RRO Compliance Evaluation Inspection (A. Romanski, 6/2007) documents flow at
Outfalls 002/003 coming from a spring (flowing there since steam tunnel construction,
and near the headwaters of the tributary). This also means stormwater sampling at that
point without groundwater interference is difficult; the facility should probably sample
stormwater further upstream of the convergence.
6. Industrial Changes Since Previous Pennit: No significant changes; however, there were
three major construction projects during the last five years. The facility installed a new
steam tunnel, completed a cooling tower project, and built a new warehouse. The
warehouse project included a cyclone separator in the stormwater system to reduce TSS
loadings.
7. Analytical Monitoring Notes: The site did not have any discharges from the stormwater
ponds', however, the plant contact has collected samples annually from both ponds
anyway. There were discharges of stormwater from areas of the site that do not drain to
the ponds (red areas on the site map). Although the permit did not require the plant to
report stormwater monitoring results from those discharges for most of the term (they
were below cut-off concentrations in the first year), the site has continued to sample them
from the splitter box annually. The reviewer requested results from 2008-2010
(summarized below). Noted that TSS from the splitter box sample in 2008 was over the
100 mg/1 cut-off concentration.
8. Qualitative Monitoring Notes: See attached documents. Just monitored pond condition
and checked for debris. Qualitative monitoring in proposed permit is the same as all
others in the industrial NPDES program.
9. Conferred with Raleigh Regional Office Inspector: Met with Autumn Romanski to
discuss site conditions, layout, and history on September 23, 2011.
10. Discussions with Permittee: 8/22 & 8/29/2011, Tim Aucoin [phone].
Fact Sheet
NPDES NC0025305
Page 4 of 6
o
o
o
Stormwater Permit Recommendations:
Monitoring recommended for this renewal:
Continued COD, TSS, O&G monitoring. These are conventional pollutants associated
with the types of activities here. The facility stores and/or transfers several types of fuel
and used oil in the East Pond drainage area (see stormwater site map). There is also a
woodworking shop in the West Pond drainage area (another possible source of
chemical oxygen demand). The COD benchmark is 120 mg/1, set at 4 times the BODs
stormwater benchmark of 30 mg/1. (COD levels in stormwater that exceed a
concentration characteristic of treated domestic wastewaters would indicate a
possible problem.) The TSS benchmark of 100 mg/1 reflects the median
concentration from the National Urban Runoff Program study. The O&G benchmark
of 30 mg/1 is set on best professional judgment (BPJ) and reflects standard
wastewater limits.
Adding pH monitorings a standard general indicator of stormwater contaminants from
industrial sites. The pH (benchmark is a range within the water quality standard of
6-9) should remain as long as there is any quantitative monitoring, particularly
because pH may be critical to interpreting toxicity of other parameters. pH is also a good
general indicator for spills of chemicals that might be stored on site.
Adding Total Petroleum Hydrocarbons (TPH ) condition for any vehicle maintenance
areas (if applicable), with a benchmark of 15 mg/1 (instead of O&G of 30 mg/1). The
SPU has replaced O&G with TPH monitoring for vehicle maintenance areas because
TPH excludes fatty matter from animal and vegetable sources. The benchmark (15 mg/1)
is consistent with other states stormwater programs and set at a level we would only
expect of stormwater with significant motor oil contamination.
Fact Sheet
NPDES NC0025305
Page 5 of 6
Q 1: What about stormwater that is not routed to the pond is discharged from the
splitter box?
Refer to site plan. All areas that are red on the plan (including collection inlets that are
also red, both on the plan and color-coded at the site) drain stormwater directly to the
splitter box. These areas include the area around the coal silos, the area between the long
term coal storage area and boiler building, and areas south of the wastewater treatment
facilities.
Q2: Where does the ash go, and how often is it hauled away?
Removal depends on load to the plant that day; sometimes only 2-3 times a week,
sometimes 10. A company called “Full Circle” takes the ash and redistributes it. It has
been used in Sanford for structural fill and in compost; OWASA has used it, and so has
the Orange County landfill. See e-mail below for details on handling and storage on site:
-------Original Message-------
From: Aucoin, Timothy L (Energy Services)
[mailto:[e-mail]]
Sent: Saturday, August 27, 2011 9:58 PM
To: Georgoulias, Bethany
Subject: RE: Follow up question
Bethany,
The ash generated at the Cogen Facility is dry ash and transported
to an ash silo using a vacuum system. The ash is then unloaded from the
ash silo into containerized trailer and hauled away for various uses. It
is never on site more than 3 days.
Thanks,
Tim Aucoin
> 7Date: Name:
Regional Office Comments
Name:_____
Supervisor:.
Date:.
Date:
Fact Sheet
NPDES NCOO253O5
Page 6 of 6
Metals benchmarks are based on ‘/a FAV (Final Acute Value), except for beryllium (no ‘Z-
FAV available). Beryllium’s benchmark is based on ‘/a LOEL (Lowest Observed adverse
Effect Level). These values reflect a protection level based on acute impacts on aquatic
life and are used for toxics like metals because of the sporadic nature of rain events.
SUMMARY OF PROPOSED CHANGES
See Section A: Outfall 001 treated industrial wastewater requirements.
See Section B: Outfall 002 & 003 stormwater requirements.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: March 14, 2012
Permit Scheduled to Issue: May 2012
NPDES DIVISION CONTACTS
If you have questions regarding any of the above information or on the attached permit, for
stormwater questions please contact Bethany Georgoulias at [phone] or email
[e-mail] , for industrial wastewater questions contact Ron Berry at (919)
807-6396 or [e-mail].
o How this monitoring differs from the NPDES Stormwater Permitting Unit s template for
other coal-fired co-generation facilities and power plants. The draft proposes the same
suite of monitoring as other power plants (the 13 priority metals, aluminum, boron, and
sulfate), but only for only the first two years. A special footnote allows the permittee to
discontinue monitoring if all levels are below benchmarks and postpones any tiered
responses for those parameters until the second year. At that time, the permittee either
(1) discontinues monitoring (no benchmark exceedances); (2) submits a request to DWQ
to discontinue monitoring with information to support no contribution by industrial
activities/materials; or (3) monitors those parameters with exceedances quarterly for the
remainder of the permit. The rationale for this varied, but similar, approach to our
“template “ stormwater permit for coal-fired power plants is:
Establishes same baseline and maintain consistency with other coal-fired power
plants’ NPDES stormwater permits issued since 2009.
- This is a well maintained site with all internal coal storage; it was also initially built
as a clean coal-handling and storage facility.
- Site has a dry ash handling system, rather than wet.
Fly ash is stored and handled in a completely enclosed building (not in ponds), and
ash is not stored for long periods of time on site (removed every few days).
- This plant was built with a dry FGD (flue gas desulphurization) process in place,
rather than having to be retro-fitted like many other power plants that had less clean
emission control processes in the past.
The SPU does not anticipate the need for as much monitoring to establish the low risk to
stormwater at this site for these reasons. However, the proposed monitoring will still
provide data on the same constituents as other coal-fired power plant facilities for
evaluation.
Facility Location
Longitude
79° 3’ 42.8" W
79° 3‘ 42.1" W
79° 3* 39.8" W
79° 3’ 39.7" W
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North
UNC Cogeneration Facility NC0025305
Orange County
uses Quad: D22NE Chapel Hill, NC
Latitude
Facility: 35° 54'23.6" N
Outfall 001: 35° 54'20.5" N
Outfall 002 (SW): 35° 54’ 21.3" N
Outfall 003 (SW): 35° 54' 21.5" N
Stream Class: WS IV, NSW
Subbasin: 03-06-06 HUC: 03030303
Receiving Stream: Unnamed tributary to Morgan Creek
Outfall 003
N00025305
Ul'JC Cogeneration Facility
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Permit NC0025305
pH Footnote 1 Grab Effluent
Temperature,0 C Footnote 1 Grab
Conductivity Footnote 1 Grab
4
5
3.
(Al <3
Part I, Page 1 of 12
Chlorides
Sulfates
EFFLUENT
CHARACTERISTICS
1.
2.
Daily
Maximum
250 mg/L
250 mg/L
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Episodic
MONITORING REQUIREMENTS
Measurement
Frequency
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Footnote 1
Sample
Type
Recording
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Effluent
Effluent
Effluent,
Upstream,
Downstream
Effluent,
Upstream,
Downstream
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
30.0 mg/L
15.0 mg/L______
Not greater than 9.0 S.U.
nor less than 6.0 S.U.
250 mg/L
250 mg/L
2.8° C maximum increase
to stream, stream not to
exceed 32° C
28 pg/L
100 mg/L
20.0 mg/L
Flow
Total Residual Chlorine3
Total Suspended Solids (TSS)
Oil and Grease
During the period beginning on f " ________
Permittee is authorized to discharge from Outfall 001 (L
The Division shall consider all effluent TRC values tv U1 vuin nance
5ern]!t Howevcr’the Permittee shall continue to record and submit all values reportedby
a North Carolina certified laboratory (including field certified), even if these values fall below 50
4. Minimum detection of 1.0 ue/L required f iJP, 5 )
Footnotes:
Once during a discharge event per calendar month.
Sample locations: Upstream = upstream at vault prior to reaching unnamed tributaiy; Downstream
- downstream at convenient site prior to reaching Morgan Creek.
Monitoring and limit only apply if chlorine or a chlorine derivative is added to any waste stream.
The Division shall consider all effluent TRC values reported below 50 pg/L to be in compliance
WxtX1 1 u fern?H’ Howevcr’the Permittee shall continue to record and submit all values reported by
a North Carolina certified laboratory (including field certified), even if these values fallxbelow 50
Minimum detection of 1.0 pg/L required, /ywi 5 -[o
SECTION A: INDUSTRIAL/PROCESS WASTEWATER
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS -
DRAFT
Sample
Location2
Effluent
Effluent
Effluent
Effluent
Arsenic, pg/L4
Copper, pg/L74"
Iron, mg/L
Selenium, pg/L_______
Thallium, pg/L 4
Zinc, pg/L 4
TKN, mg/L 5
NO3-N+NQ2-N, mg/L 5 ~
Total Nitrogen (TN), mg/L
Total Phosphorus, mg/L
I Acute Toxicity6
the ^effective ^date of this permit and lasting until expiration, the
c XI [Low Volume Wastewater, Coal Pile Runoff,Stormwater Runoff [Fuel Storage Area], Treated Industrial Wastewater). Such discharges shall be
limited and momtored by the Permittee as specified below:
~ LIMITS
Monthly
Average
0.0922 MGD
Part I, Page 2 of 12
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival and appropriate environmental controls, shall constitute an invalid test and will
require immediate follow-up testing to be completed no later than the last day of the month following
the month of the initial monitoring.
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no
later than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. Total residual chlorine
of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection
of the waste stream.
Should any test data from either these monitoring requirements 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.
Permit NC0025305
(Continued A.(l) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS)
5. TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen. TKN is Total Kjeldahl Nitrogen, and
NO3-N and NO2-N are Nitrate and Nitrite Nitrogen, respectively.
6. Acute toxicity (24 hr, Pimephales promelas} shall be performed on an episodic basis. See Part
A.(2).
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM OTHER
THAN IN TRACE AMOUNTS.
This facility is approved as a non-discharge facility with OWASA contracted to accept all the facility
process wastewater. The permit allows direct discharge of treated waste water through Outfall 001 on
an emergency bases at which time the monitoring requirements listed above need to be implemented
and compliance met. If an actual discharge does not occur during a given month, then report such on
the monthly monitoring reports.
A. (2) ACUTE TOXICITY MONITORING (EPISODIC)-DRAFT
The pennittee shall conduct FIVE acute toxicity tests using protocols defined as definitive in E.P.A.
Document EPA/600/4-90/027 entitled “Methods for Measuring the Acute Toxicity of Effluents to
Freshwater and Marine Organisms.” The monitoring shall be performed as a Fathead Minnow
{Pimephales promelas) 24 hour static test. Effluent samples for self-monitoring purposes must be
obtained below all waste treatment. Sampling and subsequent testing will occur during the first five
discrete discharge events after the effective date of this permit. After monitoring of the first five
toxicity tests, the permittee will conduct one test annually, with the annual period beginning in January
of the next calendar year. The annual test requirement must be performed and reported by June 30. If
no discharge occurs by June 30, notification will be made to the Division by this date. Toxicity testing
will be performed on the next discharge event for the annual test requirement.
The parameter code for this test is TAE6C. All toxicity testing results required as part of this permit
condition will be entered on the Effluent Discharge Form (MR-1) for the month in which it was
performed, using the appropriate parameter code. Additionally, DWQ Form AT-1 (original) is to be
sent to the following address:
Attention: Environmental Sciences Section
North Carolina Division of Water Quality
1621 Mail Service Center
Raleigh, N.C. 27699-1621
Permit NC0025305
SECTION B: STORMWATER
B. (1) INDIVIDUAL PERMIT COVERAGE-DRAFT
B. (2) PERMITTED ACTIVITIES-DRAFT
B. (3) STORMWATER POLLUTION PREVENTION PLAN-DRAFT
1.
(a)
Part 1, Page 3 of 12
This permit does not relieve the permittee from responsibility for compliance with any other applicable
federal, state, or local law, rule, standard, ordinance, order, judgment, or decree.
Until this permit expires or is modified or revoked, the permittee is authorized to discharge stormwater
to the surface waters of North Carolina or separate storm sewer system that has been adequately treated
and managed in accordance with the terms and conditions of this individual permit. All stormwater
discharges shall be in accordance with the conditions of this permit.
If industrial materials and activities are not exposed to precipitation or runoff as described in 40 CFR
§ 122.26(g), the facility may qualify for a No Exposure Exclusion from NPDES stormwater discharge
permit requirements. Any owner or operator wishing to obtain a No Exposure Certification must
submit a No Exposure Certification NOI form to the Division; must receive approval by the Division;
must maintain no exposure conditions unless authorized to discharge under a valid NPDES stormwater
permit; and must reapply for the No Exposure Exclusion once every five (5) years.
During the period beginning on the effective date of the permit and lasting until expiration, the
permittee is authorized to discharge stormwater associated with industrial activity. Such discharges
shall be controlled, limited and monitored as specified in this permit.
Site Plan. The site plan shall provide a description of the physical facility and the potential
pollutant sources which may be expected to contribute to contamination of stormwater
discharges. The site plan shall contain the following:
A general location map (USGS quadrangle map or appropriately drafted equivalent
map), showing the facility's location in relation to transportation routes and surface
waters, the name of the receiving water(s) to which the stormwater outfall(s) discharges,
or if the discharge is to a municipal separate storm sewer system, the name of the
municipality and the ultimate receiving waters, and accurate latitude and longitude of
the point(s) of discharge. The general location map (or alternatively the site map) shall
identify whether each receiving water is impaired (on the state’s 303(d) list of impaired
waters) or is located in a watershed for which a TMDL has been established, and what
the parameters) of concern are.
Any other point source discharge to surface waters of the state is prohibited unless it is an allowable
non-stormwater discharge or is covered by another permit, authorization, or approval. The stormwater
discharges allowed by this individual permit shall not cause or contribute to violations of Water
Quality Standards.
The Permittee shall develop a Stormwater Pollution Prevention Plan, herein after referred to as the
Plan. This Plan shall be considered public information in accordance with Part II, Section E, Paragraph
10 of this individual permit. The Plan shall include, at a minimum, the following items:
Permit NC0025305
(Continued B. (3) STORMWATER POLLUTION PREVENTION PLAN)
(b)
(c)
(d)
(e)
2.
(a)
(b)
Part I, Page 4 of 12
Secondary Containment Requirements and Records. Secondary containment is required
for: bulk storage of liquid materials; storage in any amount of Section 313 of Title III of
the Superfund Amendments and Reauthorization Act (SARA) water priority chemicals;
and storage in any amount of hazardous substances, in order to prevent leaks and spills
from contaminating stormwater runoff. A table or summary of all such tanks and stored
materials and their associated secondary containment areas shall be maintained. If the
secondary containment devices are connected to stormwater conveyance systems, the
connection shall be controlled by manually activated valves or other similar devices
(which shall be secured closed 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
A list of significant spills or leaks of pollutants that have occurred at the facility during
the three (3) previous years and any corrective actions taken to mitigate spill impacts.
A site map drawn to scale (including a distance legend) showing: the site property
boundary, the stormwater discharge outfalls, all on-site and adjacent surface waters and
wetlands, industrial activity areas (including storage of materials, disposal areas, process
areas, loading and unloading areas, and haul roads), site topography, all drainage
features and structures, drainage areas for each outfall, direction of flow in each
drainage area, industrial activities occurring in each drainage area, buildings, existing
BMPs, and impervious surfaces. The site map must indicate the percentage of each
drainage area that is impervious.
A narrative description of storage practices, loading and unloading activities, outdoor
process areas, dust or particulate generating or control processes, and waste disposal
practices. A narrative description of the potential pollutants which could be expected to
be present in the stormwater discharge from each outfall.
Certification that the stormwater outfalls have been evaluated for the presence of non­
stormwater discharges. The certification statement will be signed in accordance with
the requirements found in Part II, Section B, Paragraph 11. The permittee shall re­
certify annually that the stormwater outfalls have been evaluated for the presence of
non-stormwater discharges.
Stormwater Management Plan. The stormwater management plan shall contain a narrative
description of the materials management practices employed which control or minimize the
exposure of significant materials to stormwater, including structural and nonstructural
measures. The stormwater management plan, at a minimum, shall incorporate the following:
Feasibility Study. A review of the technical and economic feasibility of changing the
methods of operations and/or storage practices to eliminate or reduce exposure of
materials and processes to stormwater. Wherever practical, the permittee shall prevent
exposure of all storage areas, material handling operations, and manufacturing or
fueling operations. In areas where elimination of exposure is not practical, the
stormwater management plan shall document the feasibility of diverting the stormwater
runoff away from areas of potential contamination.
Permit NC0025305
(Continued B. (3) STORMWATER POLLUTION PREVENTION PLAN)
(c)
3.
4.
5.
6.
Part I, Page 5 of 12
Preventative Maintenance and Good Housekeeping Program. A preventative maintenance and
good housekeeping program shall be developed. The program shall list all stormwater control
systems, stormwater discharge outfalls, all on-site and adjacent surface waters and wetlands,
industrial activity areas (including material storage areas, material handling areas, disposal
areas, process areas, loading and unloading areas, and haul roads), all drainage features and
structures, and existing structural BMPs. The program shall establish schedules of inspections,
maintenance, and housekeeping activities of stormwater control systems, as well as facility
equipment, facility areas, and facility systems that present a potential for stormwater exposure
or stormwater pollution. Inspection of material handling areas and regular cleaning schedules
of these areas shall be incorporated into the program. Timely compliance with the established
schedules for inspections, maintenance, and housekeeping shall be recorded in writing and
maintained in the SPPP.
Spill Prevention and Response Plan. The Spill Prevention and Response Plan (SPRP) shall
incorporate an assessment of potential pollutant sources based on a materials inventory of the
facility. Facility personnel (or the team) responsible for implementing the SPRP shall be
identified in a written list incorporated into the SPRP and signed and dated by each individual
acknowledging their responsibilities for the plan. A responsible person shall be on-site at all
times during facility operations that have the potential to contaminate stormwater runoff
through spills or exposure of materials associated with the facility operations. The SPRP must
be site stormwater specific. Therefore, an oil Spill Prevention Control and Countermeasure
plan (SPCC) may be a component of the SPRP, but may not be sufficient to completely address
the stormwater aspects of the SPRP. The common elements of the SPCC with the SPRP may
be incorporated by reference into the SPRP.
uncontaminated by any material. Records documenting the individual making the
observation, the description of the accumulated stormwater, and the date and time of the
release shall be kept for a period of five years.
Employee Training. Training programs shall be developed and training provided at a minimum
on an annual basis for facility personnel with responsibilities for: spill response and cleanup,
preventative maintenance activities, and for any of the facility's operations that have the
potential to contaminate stormwater runoff. Facility personnel (or team) responsible for
implementing the training shall be identified, and their annual training shall be documented by
the signature of each employee trained.
BMP Summary. A listing of site structural and non-structural Best Management
Practices (BMP) shall be provided. The installation and implementation of BMPs shall
be based on the assessment of the potential for sources to contribute significant
quantities of pollutants to stormwater discharges and data collected through monitoring
of stormwater discharges. The BMP Summary shall include a written record of the
specific rationale for installation and implementation of the selected site BMPs. The
BMP Summary shall be reviewed and updated annually.
Responsible Party. The Stormwater Pollution Prevention Plan shall identify a specific
position(s) responsible for the overall coordination, development, implementation, and revision
to the Plan. Responsibilities for all components of the Plan shall be documented and position
assignments provided.
Permit NC0025305
(Continued B. (3) STORMWATER POLLUTION PREVENTION PLAN)
7.
8.
9.
B. (4) ANALYTICAL MONITORING REQUIREMENTS-DRAFT
Part I, Page 6 of 12
The Director may notify the permittee when the Plan does not meet one or more of the
minimum requirements of the permit. Within 30 days of such notice, the permittee shall submit
a time schedule to the Director for modifying the Plan to meet minimum requirements. The
permittee shall provide certification in writing in accordance with Part II, Section B, Paragraph
11 to the Director that the changes have been made.
Implementation. The permittee shall implement the Plan. Implementation of the Plan shall
include documentation of all monitoring, measurements, inspections, maintenance activities,
and training provided to employees, including the log of the sampling data and of actions taken
to implement BMPs associated with the industrial activities, including vehicle maintenance
activities. Such documentation shall be kept on-site for a period of five years and made
available to the Director or the Director’s authorized representative immediately upon request.
Analytical monitoring of stormwater discharges from Stormwater Discharge Outfalls 002 and 003
shall be performed as specified in Table 1. All analytical monitoring shall be performed during a
representative storm event. The required monitoring will result in a minimum of ten analytical
samplings being conducted over the term of the permit at each stormwater discharge outfall (SDO).
Facility Inspections. Inspections of the facility and all stormwater systems shall occur as part of
the Preventative Maintenance and Good Housekeeping Program at a minimum on a semi­
annual schedule, once during the first half of the year (January to June), and once during the
second half (July to December), with at least 60 days separating inspection dates (unless
performed more frequently than semi-annually). These facility inspections are different from,
and in addition to, the stormwater discharge characteristic monitoring required in special
conditions B.(4) and B.(5) of this permit.
Plan Amendment. The permittee shall amend the Plan whenever there is a change in design,
construction, operation, or maintenance which has a significant effect on the potential for the
discharge of pollutants to surface waters. All aspects of the Stormwater Pollution Prevention
Plan shall be reviewed and updated on an annual basis. The annual update shall include an
updated list of significant spills or leaks of pollutants for the previous three years, or the
notation that no spills have occurred. The annual update shall include written re-certification
that the stormwater outfalls have been evaluated for the presence of non-stormwater discharges.
Each annual update shall include a documented re-evaluation of the effectiveness of the BMPs
listed in the BMP Summary of the Stormwater Management Plan.
A representative storm event is a storm event that measures greater than 0.1 inches of rainfall.
The time between this storm event and the previous storm event measuring greater than 0.1
inches must be at least 72 hours. A single storm event may have a period of no precipitation of
up to 10 hours. For example, if it rains but stops before producing any collectable discharge, a
sample may be collected if the next rain producing a discharge begins within 10 hours.
Permit NC0025305
(Continued B. (4) ANALYTICAL MONITORING REQUIRMENTS)
Units
semi-annualug/l Grab SDO
semi-annualmg/1 Grab SDO
Part I, Page 7 of 12
Measurement
Frequency 1
semi-annual
semi-annual
Grab
Grab
pg/I
Mg/1
semi-annual
semi-annual
semi-annual
semi-annual
semi-annual
SDO
SDO
SDO
SDO
SDO
SDO
mg/I
mg/1
mg/1
S.U.
inches
Grab
Grab
Grab
Grab
Rain Gauge
Footnotes:
1. Measurement Frequency: Twice per year during a representative 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. See Table
2 for schedule of monitoring periods through the end of this permitting cycle.
2. If the stormwater runoff is controlled by a stormwater detention pond, a grab sample of the
discharge from the pond shall be collected within the first 30 minutes of discharge.
3. Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) unless
representative outfall status has been granted.
4. Mercury shall be analyzed by EPA Low-level detection method 163IE. This method also requires
a field blank be analyzed. A benchmark does not apply; however, values above 0.012 fig/l should
be noted on annual SDO DMR reports to the Regional Office.
5. Monitoring for the 13 priority pollutant metals, Al, B, and/or sulfate may be discontinued after the
first four (4) sampling events if results are below benchmark concentrations (with the exception of
mercury). For the first two (2) sampling events, these parameters are exempt from tiered response
actions (even if other parameters trigger monthly monitoring). For any of these parameters other
than mercury that are above benchmark concentrations in the second year of the permit, the
permittee shall either (1) begin following Tier requirements; or (2) submit a request to the Division
to discontinue monitoring with information to demonstrate the industrial activities or materials at
this site are not a significant contributor to stormwater discharge concentrations; or (3) monitor just
the parameters with any benchmark exceedances (in Year 1 or 2) quarterly for the remainder of the
permit.
Sample
Type 2
Sample
Location3
Discharge
Characteristics
40 CFR Part 423 Appendix A:
13 Priority Pollutant Metals
(Ag, As, Be, Cd, Cr, Cu, Hg,
Ni, Pb, Sb, Se, Tl, Zn) 4’S
Al5____________________
B5
Chemical Oxygen Demand
(COD)
Total Suspended Solids (TSS)
Sulfate 5
Oil and Grease (O&G)
pH____________________
Total Rainfall 6
Table 1: Analytical Monitoring Requirements for Stormwater Outfalls
Table 2: Monitoring Schedule
Table 3: Benchmark Values for Analytical Monitoring
The permittee shall complete the minimum ten analytical samplings in accordance with the schedule
specified below in Table 2. A minimum of 60 days must separate Period 1 and Period 2 sample dates
unless monthly monitoring has been instituted under a Tier Two response.
Permit NC0025305
6. For each sampled representative storm event the total precipitation must be recorded. An on-site
rain gauge or local rain gauge reading must be recorded.
(Continued B. (4) ANALYTICAL MONITORING REQUIREMENTS)
Discharge Characteristics
Aluminum
Antimony
Arsenic_________________
Beryllium
Boron
Cadmium
_______Units
mg/1
mg/l
mg/1
mg/1
________mg/1
________mg/1
Part I, Page 8 of 12
Start
January 1, 2012
July 1,2012
January L 2013
July 1,2013
January 1, 2014
July 1,2014
January 1, 2015
July 1,2015
January 1, 2016
July 1,2016
Benchmark
0.75
0.09
0.36
0.07
N/A
0.001
End
June 30, 2012
December 31, 2012
June 30,2013
December 31, 2013
June 30, 2014
December 31, 2014
June 30, 2015
December 31, 2015
June 30, 2016
December 31,2016
Sample Number
1
2
3
4
5
6
7
8
9
10
The permittee shall report the analytical results from the first sample with valid results within the
monitoring period. In addition, a separate signed Annual Summary DMR copy shall be submitted to
the local DWQ Regional Office (RO) by March 1 of each year. The permittee shall compare
monitoring results to the benchmark values in Table 3. The benchmark values in Table 3 are not
permit limits but should be used as guidelines for the permittee’s Stormwater Pollution Prevention Plan
(SPPP). 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.
Footnotes:
1. Maintain semi-annual monitoring during permit renewal process. If at the expiration of the
Individual Permit, the permittee has submitted an application for renewal of coverage before the
submittal deadline, the permittee will be considered for renewed coverage. The applicant must
continue semi-annual monitoring until the renewed Certificate of Coverage is issued.
2. If no discharge occurs during the sampling period, the permittee must submit a monitoring report
indicating “No Flow” within 30 days of the end of the six-month sampling period.
Monitoring Period 12
Year 1 - Period 1
Year 1 - Period 2
Year 2 - Period 1
Year 2 - Period 2
Year 3 - Period 1
Year 3 - Period 2
Year 4 - Period 1
Year 4 - Period 2
Year 5 - Period I
Year 5 - Period 2
1
1.
Part I, Page 9 of 12
Footnote:
1. If pH values outside this range are recorded in sampled stormwater discharges, but ambient
rainfall data indicate precipitation pH levels are within ±0.1 standard units of the measured
discharge values or lower, then the lower threshold of this benchmark range does not apply.
Readings from an on-site or local rain gauge (or local precipitation data) must be documented
to demonstrate background concentrations were below the benchmark pH range.
4.
5.
2.
3.
Discharge Characteristics
Chromium
Units
mg/1
Units
mg/1
mg/1
pg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
mg/1
S.U.
_________Permit NC0025305
Benchmark
1
(Continued B. (4) ANALYTICAL MONITORING REQUIREMENTS - Table 3)
Discharge Characteristics
Copper
Lead
Mercury
Nickel__________________
Selenium
Silver___________________
Thallium
Zinc____________________
COD
TSS
Sulfate
O&G
pH (see footnote 7)
Benchmark
0.007
0.03
N/A
0.26
0.056
0.001
N/A
0.067
120
100
500
30
6-91
______________________________________Tier One___________________________________
If: The first valid sampling results are above a benchmark value, or outside of the benchmark range,
for any parameter at any outfall;__________________________________________________
Then: The permittee shall:
Conduct a stormwater management inspection of the facility within two weeks of receiving
sampling results.
Identify and evaluate possible causes of the benchmark value exceedence.
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 within the benchmark range.
Implement the selected actions within two months of the inspection.
Record each instance of a Tier One response in the Stormwater Pollution Prevention 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.
Permit NC0025305
(Continued B. (4) ANALYTICAL MONITORING REQUIREMENTS - Tier Two)
Part I, Page 10 of 12
The site discharges into the watershed of the Jordan Reservoir, experiencing problems with excessive
nutrient loading. A TMDL applies to this watershed, which is also subject to the Jordan Lake Rules
(ISA NCAC 2H .0262-.0273) and related legislation (Session Laws 2009-216 and 2009-484). If
additional BMPs are needed to achieve the required level of control for any pollutants addressed by the
TMDL, the permittee will be required to (1) develop a strategy for implementing appropriate BMPs,
and (2) submit a timetable for incorporation of those BMPs into the permitted Stormwater Pollution
Prevention Plan.
• Require that the permittee increase or decrease the monitoring frequency for the remainder
of the permit;
• Work with the permittee to develop alternative response strategies;
• Require the permittee to install structural stormwater controls;
• Require the permittee to implement other stormwater control measures; or
• Require the permittee implement site modifications to qualify for a No Exposure Exclusion.
______________________________________Tier Two____________________________________
If: During the term of this permit, the first valid sampling results from two consecutive monitoring
periods are above the benchmark values, or outside of the benchmark range, for any specific
parameter at a specific discharge outfall; ________________________________________
Then: The permittee shall:
1. Repeat all the required actions outlined above in Tier One.
2. Immediately institute monthly monitoring for all parameters (except mercury) 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.
3. If no discharge occurs during the sampling period, the permittee is required to submit a
monthly monitoring report indicating “No Flow” to comply with reporting requirements.
4. Maintain a record of the Tier Two response in the Stormwater Pollution Prevention Plan.
I Tier Three
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 four occasions, the permittee shall notify the DWQ Raleigh
Regional Office Supervisor in writing within 30 days of receipt of the fourth analytical results.
DWQ may, but is not limited to:
Permit NC0025305
B. (5) QUALITATIVE MONITORING REQUIRMENTS-DRAFT
Table 4: Qualitative Monitoring Requirements
Frequency 1
Part I, Page 11 of 12
Footnotes:
1. Measurement Frequency: Twice per year during a representative 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. See Table
2 for schedule of monitoring periods through the end of this permitting cycle.
2. Monitoring Location: Qualitative monitoring shall be performed at each stormwater discharge
outfall (SDO) regardless of representative outfall status.
In the event an atypical condition is noted at a stormwater discharge outfall, the permittee shall
document the suspected cause of the condition and any actions taken in response to the discovery. This
documentation will be maintained with the SPPP.
Discharge
Characteristics
Color
Odor
Clarity
Floating Solids
Suspended Solids
Foam
Oil Sheen__________________
Erosion or deposition at the outfall
Other obvious indicators
of stormwater pollution
semi-annual
semi-annual
semi-annual
semi-annual
semi-annual
semi-annual
semi-annual
semi-annual
semi-annual
Monitoring
Location2
SDO
SDO
SDO
SDO
SDO
SDO
SDO
SDO
SDO
Qualitative monitoring requires a visual inspection of each stormwater outfall regardless of
representative outfall status and shall be performed as specified in Table 4, 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 Pollution Prevention Plan (SPPP) and assessing new sources of stormwater pollution.
Permit NC0025305
Table 5: Analytical Monitoring Requirements for On-Site Vehicle Maintenance
Units
standard
mg/1 semi-annual Grab 15 mg/1 SDO
100 mg/1 SDO
1.
2.
3.
4.
Part I, Page 12 of 12
B. (6) ON-SITE VEHICLE MAINTENANCE MONITORING REQUIREMENTS-
DRAFT
Discharge
Characteristics
Measurement
Frequency 1
semi-annual
mg/1
inches
gallons/month
semi-annual
semi-annual
semi-annual
Grab
Rain gauge
Estimate
pH
Total Petroleum
Hydrocarbons (TPH),
EP A Method 1664 (SGT-HEM)
Total Suspended Solids
Total Rainfall4
New Motor Oil Usage
Benchmark
Value(s)
6-9 S.U.
Facilities which have any vehicle maintenance activity occurring on-site which uses more than 55
gallons of new motor oil per month when averaged over the calendar year shall perform analytical
monitoring as specified below in Table 5. This monitoring shall be performed at all stormwater
discharge outfalls which discharge stormwater runoff from vehicle maintenance areas, and in
accordance with the schedule presented in special condition B. (4) Table 2. All analytical monitoring
shall be perfonned during a representative storm event.
Monitoring results shall be compared to the benchmark values in Table 5. The benchmark values in
Table 5 are not permit limits but should be used as guidelines for the permittee’s Stormwater Pollution
Prevention Plan (SPPP). Exceedences of benchmark values require the permittee to increase
monitoring, increase management actions, increase record keeping, and/or install stormwater Best
Management Practices (BMPs), as provided in special condition B. (4) in this permit.
Footnotes:
Measurement Frequency: Twice per year during a representative 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. See Table
2 for schedule of monitoring periods through the end of this permitting cycle.
If the stormwater runoff is controlled by a stormwater detention pond a grab sample of the
discharge from the pond shall be collected within the first 30 minutes of discharge from the pond.
Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) that
discharges stormwater runoff from area(s) where vehicle maintenance activities occur.
For each sampled representative storm event the total precipitation must be recorded. An on-site or
local rain gauge reading must be recorded
Sample
Type2
Grab
Sample
Location 3
SDO