NCS000077_HISTORICAL WITH APPLICATION_20150127

LL-------STORMWATER-DIVISION-CODING-SHEET---
PERMIT NO.
N L 000G
DOC TYPE
❑ FINAL PERMIT
❑ MONITORING INFO
[(APPLICATION
❑ COMPLIANCE
❑ OTHER
DOC DATE
❑ �' 0) S 0 I �-1
YYYY M M D D

Central Files: APS - SWP
112312015
Permit Number NCS000077
Permit Tracking Slip
Program Category
Status Project Type
NPOES SW
in draft Renewal
Permit Type
Version Permit Classification
Stormwater Discharge, Individual
Individual
Primary Reviewer
Permit Contact Affiliation
aana.taylor-smith
Coastal SWRule
Permitted Flow
0
Facility
Facility Name Major/Minor Region
Dow Coming Corporation Minor Winston-Salem
Location Address County
2914 Patterson St Guilford
Facility Contact Affiliation
Greensboro NC 27407
Owner
Owner Name
Owner Type
Dow Coming Corporation
Non -Government
Owner Affiliation
Jake Fitzgerald
2914 Patterson St
DateslEvents
Greensboro NC 27407
Scheduled
Orig Issue App Received Draft Initiated Issuance
Public Notice Issue]
Effective
Expira ian
Sn111994 10/5/2011 9111/2014
9/28/2014 I y!] (] 5
a J 112-01.5
f 1f3f 7 o i q
Regulated Activities
Requested /Received Events
Stormwater (activities not covered)
Region comments on draft requested
413112
Region commenlS on draft received
RO staff report received
9/11114
RO staff report requested
9110114.
Outfall 1
Waterbody Name Streamindex Number Current Class Subbasin
South Buffalo Creek 16-11-14-2 WS-V;NSW 03-06-02

7*'1 A.
...V
NC®ENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
Mr. fake Fitzgerald
Dow Corning Corporation
2914 Patterson Street
Greensboro, North Carolina 27407
Dear Mr. Fitzgerald:
John E. Skvarla, III
Secretary
September 18, 2014
Subject: Draft NPDES Stormwater Permit
Permit No. NCS000077
Dow Corning Corporation
Guilford County
Enclosed with this letter is a copy of the draft stormwater permit for your facility. Please review the draft
very carefully to ensure a thorough understanding of the conditions and requirements it contains.
The draft permit contains these significant changes from the facility's current permit:
1. Requirements for the Stormwater Pollution Prevention Plan have been updated in Part I1, Section A.
2. Benchmarks for analytical monitoring have been added to this draft permit. Exceedances require the
initiation of a tiered response program that involves increased monitoring, management actions, record -
keeping, and/or Best Management Practice (BMP) installation. See Part I1, Section B of the draft permit
for tiered response guidelines.
3. You are required to collect analytical and qualitative monitoring samples during a "measureable storm
event" as defined in Part 11, Section B. This term is different from the "representative storm event" in
earlier permits.
4. Vehicle maintenance monitoring parameters have been revised. "Non -Polar Oil & Grease" by Method
1664 (SGT-HEM) replaces Oil & Grease or TPH. This requirement appears in all individual stormwater
permits; however, it only applies to facilities that perform vehicle maintenance activities (VMA) on -site.
If the facility begins vehicle maintenance during the permit cycle, the requirements shall apply. Also, pH
monitoring is no longer required for discharges only associated with VMA.
Please submit any comments to me no later than thirty (30) days following your receipt of the draft.
Comments should be sent to the address listed on the front page of this letter. If no adverse comments are
received from the public onfrom you, this permit will likely be issued in about two months.
Division of Energy, Mineral, and Land Resources
Land Quality Section • Winston-Salem Regional Office
585 Waughlown Street, Winston-Salem, NC 27107 - Phone: [phone] / FAX: [phone]

Mr. lake Fitzgerald
September 18, 2014
Page 2 of 2
Please note that the proposed expiration date is shorter than five years in an effort to redistribute the
number of individual permits expiring in 2019. If you have any questions or comments concerning this draft
permit, contact me at [phone] or [e-mail]
Sincerely,
anm ,
Aana Taylor-Sm��th
Environmental Specialist
Division of Energy, Mineral, and Land Resources
CC: Winston-Salem Regional Office, DEMLR LQS
Stormwater Permitting Program
Attachments: NCS000077 Draft Permit

'A p
NCS000077 Sal `11a,o
ge
NCD NR.
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P.E.
Governor Director
Facility Name:
,\NPDES Permit Number:
Facility Location:
Type of Activity:
SIC Code:
Receiving Streams:
River Basin:
Stream Classification:
Proposed Permit Requirements
Monitoring Data:
Response Requested by (Date)
Central Office Staff Contact:
Special Issues:
STAFF REVIEW AND EVALUATION
NPDES Stormwater Permit
Dow'Corning Corporation
NCS000077
2914 Patterson Street, GeensbQro, NC (Guilford County)
Plastics Material and Resin Manufaciuring
2821
See Figure 1
Cape Fear River Basin, Sub -basin 03-06-02
WS-V, NSW
See attached draft permit.
See Table i
April 30, 2012
Return to: Jennifer Jone
19)807-6379
'Issue
Rating'Scale: Teas ao;10 and
Compliance history
3
Benchmark exceedance
3
Location (TMDL, T&E
species, etc)
3
Other Challenges:
3
Difficult Ratio :
12/40
Rc.DeAt. of &M
APR 05 2012
Winston-Salem
Dee Freeman
Secretary
Special Issues Explanation:
1. It is unclear as to what Representative outfall status the permittee holds and what. future representative
outfall status the permittee would like to obtain with their new facility configuration. RO: Please ask the
permittee to detail this and request or produce a request of their representative outfall status letter. I I have
requested information from the permittee but have not heard back as of yet, so am continuing forward].
2. It appears from the TRI that there are many organic chemicals onsite including Toluene and Xylene. RO:
Does the Regional office feel it may be necessary for the permittee to sample BOD and COD, (based on a
site evaluation)? e.g. depending on what types of containers and exposure are at each outfall.
3. RO: During your site visit, please obtain copies of sample results for years 2007-2010, and any for 2012 as
we do not have copies of these, and send them to Central Office. [I have requested information from the
permittee but have not heard back as of yet, so am continuing forward].
Page 1 of 10

i
777

L NCS000077
Description of Onsite Activities:
• Plastics Material and Resin Manufacturing
Documents Reviewed:
NPDES Stormwater Permit Application Materials
m Nationai heritage. Program (N11P) ; hrcatencd and Endangcrcd Spccics Datavasc
• SPU File
• Central Files
• EPA Sector -Specific Permit, 2008
• 303(d) List: 2010 final, 2012 draft
History:
• Date permit first issued: 8/31/1994
• Date permit re -issued: April 27, 2007
• Date permittee submitted renewal application: October 5, 2011
• Other dates: Last renewed permit expires on April 26, 2012.
• August 31, 1994: Letter containing a permit effective October 1, 1994 until August 31, 1999.
• December 10, 1999: Letter containing a permit effective January 1, 2000 until December 31, 2004.
• July 9, 2004: Division received the permit application.
• December 3, 2004: Division acknowledged receipt of the permit application.
Central Office Review Summary:
Owner's Other Permits:
Statute
System
Source ID
Facility Name
Street Address
City
State
Zlp
FRS
110000346634
DOW CORNING CORP.
2914 PATTERSON ST.
GREENSBORO
NC
27407
CAA
AFS
3708100239
DOW CORNING CORPORATION
2914 PATTERSON STREET
GREENSBORO
NC
27407
CAA
NEI
NE145903
DOW CORNING CORP
NC
27407
---
CWA
PCS
NCS000077
Dow Coming Corporation
2914 Patterson St
GREENSBORO CITY
NC
27407
CWA
PCS
NCO088773
Dow Coming Corp Greensboro Re
2914 Patterson St
GREENSBORO CITY
NC
27407
RCRA
IRCR
NCDO03221546
DOW CORNING CORPORATION
2914 PATTERSON ST
GREENSBORO
NC
27407
EP313
TRI
27407DWCRN2914P
DOW CORNING CORP.
2914 PATTERSON ST
GREENSBORO
NC
27407
BIENNIAL HAZARDOUS WASTE
REPORTERS NCDO03221546 BIENNIAL REPORTER
INTEGRATED
COMPLIANCE 2657083 FORMAL ENFORCEMENT
INFORMATION ACTION
SYSTEM
RCRAINFO 12/31/2009
ICIS 11/01/2002 ICIS-04-2002-9974
FORMAL ENFORCEMENT ACTION
Page 3 of 10

NCS000077
r.
NORTH
CAROLINA -
FACILITY
IDENTIFICATION 4486
TEMPLATE FOR
STATES
-0-017529
UNDERGROUND STORAGE TANK
PROGRAM
STATE MASTER NC -FITS 115DA4YGOOTXYW54FBEQ8BVKH8
WASTEWATER FACILITY
-3919
AIR PROGRAM
NATIONAL
E14iSSIL'f�5�
°_= NEi�5903���
CRITERIAAND-HA2:ARDOUS
'NO —
INVENTORY
AIR POLLUTANT INVENTORY
PERMIT
COMPLIANCE NCO088773 NPDES NON -MAJOR NPDES 10/21/2008
SYSTEM PERMIT
PERMIT
COMPLIANCE
m NCS00007.7
.a NPDES VONE MAJOR = -=
NPDES
"' pERNIiT`
"'SYSTEM:—
RESOURCE
CONSERVATION
AND RECOVERY
ACT NCDO03221546
INFORMATION
SYSTEM
LQG (ACTIVE) NOTIFICATION 10/19/2011
(RCRA)
RESOURCE
NCD 0 2 154
TSD (ACTIVE)
OTIFICATIO
(RCRA)
10/19/2011
CONSERVATION
AND RECOVERY
ACT
INFORMATION
SYSTEM
TOXIC RELEASE TRI
INVENTORY 27407DWCRN2914P TRI REPORTER REPORTING 06/27/2011
SYSTEM FORM
General Observations: From Kelly Johnson in 2007 permit review: "This facility drains to NSW waters, and has
consistently been under the benchmark for nitrogen. Of the four samples for each of five outfalls, only one
phosphorus sample was over the benchmark, and not excessively above it. The permittee has had consistent TSS
exceedances at outfall number five. This may be due to the layout of the facility.
The site map shows that outfall number one is at the northern most part of the facility. This side of the
property borders an asphalt company. Outfall number one had one TSS exceedance. Outfall number one
drains to the collection point of outfall number two, which drains to number three, then to number four, and
then to number five. It is likely that outfall number five has high TSS readings because it is the final collection
point. It is likely that solids from the asphalt company flow onto the permittee's site. The reviewer
recommends that the permittee control offsite TSS as much as possible while also working to control any
onsite TSS."
2012: There are still high apparent TSS recurring issues, as well as some pH exceedences as well. It is unclear as
to why this is occurring. The permittee has not addressed this in the application. pH will be kept in the permit
and a tiered response is also now included in this permit draft.
Impairment: From 2007: "This facility drains to an unnamed creek of South Buffalo Creek. The 303(d) list
divides Stream Index Number 16-11-14-2 into three parts; a, b, and c. This facility drains to "a", which is
classified as from the source of the creek to McConnell Road. This 15.4-mile section was impaired in 1998 for
biological integrity, and in 2006 for turbidity standard violation. Both the 303(d) list and the Basinwide Plan
Page 4 of 10

NICS000077
cite MS4 NPDES as the source for this stress on the creek."
2012: On the 2012 Draft North Carolina 303(d) List (Category 5), there is no entryfor South Buffalo Creek 16-
11-14-2 "a". Designations a, b and c does not exist in B1MS as well. On the 2012 303D list, the sections b and c
are listed for ecological/biological integrity. l have contacted the TMDL/MTU unit and they sent me a
confirmation that 16-11-14-2a is still listed as impaired for biological/ecological integrity and fluoride, selenium
and cyanide have been moved to the AU 16-11-14-2c because the TMDL was develop to address these
discharges specifically. See below for email wording.
4. Threatened and Endangered: information no longer available.
5. Location: This facility drains to NSW waters.
6. Significant Facility Changes Since Previous Permit: Previous 2007 Permit Reivew: "A Mix and blend operation
within building number five was shut down in 2000. In 2003, a hot melt process was started up in building
number three. The raw materials used in this process have containment structures. The applicant says that
neither change has impacted the site stormwater program".
2012 Draft Charges: A warehouse was installed around Building 2 and placed in operation on September 2010.
There is a new stormwater drainage basin as denoted in the map as Outfall #2, which is located east of
Building 2. A new Drainage basin was also installed in the front of the building on the west side which drains to
outfall No. 3.
The TSE Tank farm has a drainage valve from the secondary containment area in which the outlet opens to the
the soil. This valve is monitored closely and only opened to release rainwater from the secondary containment
area. This has been added as Outfall No. 6 to the stormwater plan.
7. Analytical Monitoring Notes:
2012 Draft: Permittee did not turn in qualitative monitoring for the entire permit cycle. However, the
monitoring that was turned in indicates that TSS and pH had some ongoing issues at the facility. There was no
tiered response in place in the previous permit cycle so that now will be implemented. Permittee appears to
have sampled in October and November of 2011, but this was not in their permit requirements. There have also
been some pH exceedences as well. It is unclear as to why this is occurring. The permittee has not addressed
this in the application.
Qualitative Monitoring Notes:
2012 Draft: Permittee did not turn in qualitative monitoring for the entire permit cycle. However, the
monitoring that was turned in indicates that qualitative monitoring for this facility does not highlight any
problems.
Page 5 of 10

NCS000077
From: Behm, Pamela
Sent: Friday, March 30, 2012 11:16 AM
To: Jones, Jennifer
Subject: 2012 draft 303(d) list
We submitted the draft list to EPA this morning for approval. The list sent to EPA includes the impairments for 16-11-14-2a, see below. Fluoride,
selenium, and cyanide has been moved to the AU 16-11-14-2c because the TMDL was developed to address the discharge specifically, so I don't think
that needs to be a component of your permit.
Hope this helps! If you have any other questions, give me a call. Thanks,
Pam
2012 North Carolina 303(d) List -Category 5
r- 4,emu.. - �.,, -� a � s ---- --- �;---••-- . r � t' � _
6 6&i� arRivO;Basin l0 dlgrt Watershed U3D300U201 Fteeay F,ark
,14;p iart6 r. FionGt Qeticci tbl?f+ ` — Length or rime ifRitiL ��ssl�lcrbillnn i atmuiy
Category Rating Use Reason for Rating Parameter Year 1
> 16-11-14-2a South Buffalo Creek From source to McConnell Rd 15.4 Fw Miles wS-V,NSW S
5 Impaired
Aquatic Life
Fair Bioclassification
Ecological/biological Integrity FishCom 2012
5 Impaired
Aquatic life
Fair Bioclassification
Ecological/biological Integrity Benthos 2008
> 16-11'14-2b
South Buffalo crook
Frain MiConneil Rd to US 70
4.7 Fw Mites
WS-V;NSW 5
5
Impaired Aquatic Life
Poor Bloclassification
Ecological/biological Integrity FishCorn
1998
16.11-14-2c
South Buffalo Creek
From US 70 to Buffalo [leek
4.8 rw Miles
WS•V;NSW 5
5 Impaired
Aquatic Life
Standard Violation
Copper
2008
S Impaired
Aquatic Life
Standard Violation
Zinc
2008
1 -mail correspondence to and from this address may be subject to the North Carolina Public Records I..aw and may be disclosed to third parties.
Page 6 of 10
ti I

IF►IM111110YA
Table 1: Analytical Monitoring
Pe€mit }
Numbers
,: Lab.#`'
OU . 511
Number
date sampled
rainfall
Inj
TSS
(mg/Lj
101):
M 6-9
Nitrogen
(mg%1 30
m I� 'rng/I
Phosphorus,
( g L) 2 y
ND
0.082
0.096
0.36
0.381
0.057
0.19
NCS000077
40
6
10/19/11
0.18
9.6
7.1
ND
NCS000077
40
5
10/19/11
0.18
32.7
6.9
ND
ND
NC5000077
40
2
10/19/11
0.18
ND
7.2
NCS000077
40
6
09/21/11
0.34
68,1
260
9.1.
9:Z,
5.4
NCS000077
40
5
09/21/11
0.34
4.7
1.4
NC5000077
40
4
09/21/11
0.34
15.7
8.1
NCS000077
40
3
09/21/11
0.34
11.9
8.6
3.2
NCS000077
40
2
09/21/11
0.34
8.4
3.6
0.25
0.068
0.2
0.052
nd
nd
nd
NCS000077_
40
1
09/21/11
0.34
15.7
7
1.1
NC5000077
1
2
3
4
5
5/12/2011
5/12/2011
5/12/2011
5/12/2011
5/12/2011
0.3
0.3
0.3
0.3
0.3
14
6.7
8.3
nd
nd
JR
- -- 8.7
1.1
2.9
2.5
0.64
NCS000077
NCS000077
NCS000077
NCS000077
Page 7 of 10

NCS000077
TN
(mall-)
TP
m1L
TSS
m/L
Benchmark:
30 (mglL)
Benchmark:
2 (mglL)
Benchmark:
.100 (mgll)
Required
Sampling
Range
Date
Outfall #1
Q1, 2003
13-Mar-03
1,751
0.128 34.3
Q2, 2003
5-A r-03
2.111
0.661 6
Q3, 2003
Q4, 2003
2-Jul-03
28-Oct-03
2,981
<1.0
0.596
22.5
Required
Sampling
Range
Date
Outfall #2
Q1, 2003
13-Mar-03
3.04
0.851
90
Q2, 2003
5-A r-03
1.86
0.625
5.33
Q3, 2003
2-Jul-03
1.30
0.192
72.6
Q4, 2003
28-Oct-03
<1.0
0.666
22.2
Required
Sampling
Rancie
Date
Outfall #3
Q1, 2003
13-Mar-0
1.59
0.104
6.0
Q2, 2003
5-A r-03
1.79
0.223
20.0
Q3, 2003
2-Jul-03
2.35
0.180
6.0
Q4, 2003
28-Oct-03
0.670
0.551
10.4
Required
Sampling
Rancie
Date
Outfall #4
Q1, 2003
13-Mar-03
1.97
0.545
163
Q2, 2003
5-A r-03
1.71
0.274
18.6
Q3, 2003
2-Jul-03
1.42
<0.050
10.2
Q4, 2003
28-Oct-03
<1.0
0.510
6.6
Required
Sampling
Ranae
Date
Outfall #5
Q1, 2003
4.23
0.709
Q2, 2003
A28-Oct-0
<1.0
0.583 87
Q3, 2003
<1.0
0.089
Q4, 2003
1.96
-. I
Page 8 of 10

N003000077
Revised Permit Recommendations: Analytical Monitoring:
. Retaining all analytical monitoring permit parameters.
2.. All analytical monitoring remains as semi-annual during a representative storm event as defined in Part 11
Section B. The permittee must also document the totai precipitation for each event. 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. Additionally, samples must be taken a minimum of 60 days apart,
as specified in Table 2.
3. Benchmarks for analytical monitoring have been added to this draft permit. Exceedances 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. If the sampling results are above a
benchmark value, or outside of the benchmark range, for any parameter at any outfall then the facility shall
follow the Tier 1 guidelines which require a facility inspection within two weeks and implementation of a
mitigation plan within two months. If during the term of this permit, the 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 facility shall follow the Tier 2 guidelines which require a repetition of
the steps listed for Tier I and also immediately institute monthly monitoring for all parameters at every outfall
where a sampling result exceeded the benchmark value for two consecutive samples.
4. The permittee is required to collect all of the analytical and qualitative monitoring samples during representative
storm events as defined in Part II Section B. Qualitative monitoring is required regardless of representative
outfall status.
5. The permittee is responsible for all monitoring until the renewal permit is issued. See Footnote I of Tables 1, 4,
and 5.
6. The flow reporting requirement has been removed per DWQ revised strategy. (The total rainfall parameter is in
this permit, however.)
7. Vehicle maintenance monitoring has been revised to semi-annually in order to coincide with analytical and
qualitative monitoring.
Other Proposed Changes to the Previous Permit:
Additional guidance is provided about the Site Plan requirements. The site map must now identify if the
receiving stream is impaired and if it has a TMDL established. It must also describe potential pollutants in each
outfall. The map requirements are stated more explicitly. And, the site plan must contain a list of significant
spills that have occurred in the past three years and also must certify that the outfalls have been inspected to
ensure that they do not contain non-stormwater discharges. Additional information is provided in Part II Section
A.
Additional requirements for the Stormwater Management Plan have been specified in Part 11 Section A. More
details regarding secondary containment are provided.
Additional requirements for the Stormwater Pollution Prevention Plan have been specified in Part lI Section A.
The plan must also be updated annually to include a list of significant spills and to certify that the outfalls do not
contain non-stormwater discharges.
The facility must now implement a semi-annual Facility Inspection Program of the site's stormwater
management controls as specified in Part II Section A.
Information regarding the No Exposure Exclusion has been added to this draft permit. If industrial materials and
activities are not exposed to precipitation or runoff as described in 40 CFR § I22.26(g), the facility may qualify
for a No Exposure Exclusion from NPDES stormwater discharge permit requirements. Additional information
is provided in Part I Section A.
Page 9 of 10

NCS000077
Recommendations: Based on the documents reviewed, the application information submitted on October 5, 2011
sufficient to issue an Individual Stormwater Permit.
Prepared by (Signature) Date `3 Z
Stormwater Permitting Unit Supervisor Date 4 z 2 m 1 Z
for Bradley Bennett
Concurrence by Regional Office Date
RO Water Quality Supervisor Date
ftegivi in!(attach additional pages as necessary)
is itof of a!I clear /;w n I -AP .rime /ate izoul /Ae
i"0;PnA /-eCl ou?4fa!/-I Anake .rP,nS&. A?76117a/ mut�'a!/s � d;plrer
a��are�fi- /o �tfa!/s .i
�- QIF��•'�� d d su �? u�st l�I ��20
S/� ✓IX17 �O
/ C/a�/~JJ a7.F.ifSS, /�e[� �n�Srr� �lan wtirk-cl
/C40 Cer "Me" '.r
Page 10 of 10

f
NCS000077
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE STORMWATER UNDER THE
In compliance with the provisions of North Carole" eneraNKtute 143-215.1, other
lawful standards and regulations promulgated arkd74'*j5Lted by the North Carolina
Environmental Management Commission, an edV Water Pollution Control Act, as
amended,
orporation
is hereby authorized to dischafge ater from a facility located at:
ffv Corning Corporation
2914 Patterson Street
Greensboro, NC
Guilford County
to receiving waters designated as a UT to South Buffalo Creek, a class WS-V, NSW stream in
the Cape Fear River Basin, in accordance with the discharge limitations, monitoring
requirements, and other conditions set forth in Parts I, 11, Ili, and IV hereof.
Note: Draft Permit Dates are Approximate
This permit shall become effective June 1, 2012.
This permit and the authorization to discharge shall expire at midnight on May 31, 2012.
Signed this day May 15, 2012.
for Charles Wakild, P.E., Director
Division of Water Quality
By the Authority of the Environmental Management Commission

PART 1
Section A:
Section B:
Section C:
PART II
Section A:
Section B:
Section C:
Section D:
TABLE OF CONTENTS
INTRODUCTION
Individual Permit Coverage
Permitted Activities
Location Man
MONITORING, CONTROLS, AND LIMIAla
DISCHARGES
Stormwater Pollution Prevention
Analytical Monitoring Req . e n
Permit No. NCS000077
PERMITTED
Qualitative Mo 'torin q r nts
On -Site Vehicle i` n Monitoring Requirements
PART III STANDARD C%7 FOR NPDES STORMWATER INDIVIDUAL PERMITS
Section A: Compliance
and Liability
1.
Compliance Schedule
2.
Duty to Comply
3.
Duty to Mitigate
4.
Civil and Criminal Liability
S.
Oil and Hazardous Substance Liability
6.
Property Rights
7.
Severability
8.
Duty to Provide Information
9.
Penalties for Tampering
10.
Penalties for Falsification of Reports
11.
Onshore or Offshore Construction
12.
Duty to Reapply
I

e
Permit No. NCS000077
Section B: General Conditions
1. Permit Expiration
2. Trans rers
3. Signatory Requirements
4. Permit Modification, Revocation and Reissuance, or Termination
S. Permit Actions
6. Annual Administering and Compliance Monitoring Fee
Requirements
Section C: Operation and Maintenance of PollutonMCo7itrols
1. Proper Operation and Ma' a ce
IV
2. Need to Halt or Reduce NMtI
e
3. Bypassing of Storm wat,cilities
Section D: Monitoring and Records
1. Represe tativ m
2. Recor e l
3. Flow M r e
4. Tes roced
S. Re sent ve Outfall
6. Re etention
7. Inspection and Entry
Section E: Reporting Requirements
1. Discharge Monitoring Reports
2. Submitting Reports
3. Availability of Reports
4. Non-Stormwater Discharges
S. Planned Changes
6. Anticipated Noncompliance
7. Spills
8. Bypass
9. Twenty-four Hour Reporting
10. Other Noncompliance
11. Other Information
PART IV DEFINITIONS

Permit No. NCS000077
PART I INTRODUCTION
SECTION A: INDIVIDUAL PERMIT COVEII�AOE
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.
If industrial materials and activities are net exposed to precipitation or runoff as described
in 40 CFR §122.26(g), the facility may qualify for a No Ex os a Exclusion from NPDES
stormwater discharge permit requirements. Any,kne perator wishing to obtain a No
Exposure Exclusion must submit a No Exposure o of of Intent (NOI] form to
the Division; must receive approval by the Divisi in • n no exposure conditions
unless authorized to discharge under a valid NPDwater permit; and must recertify
the No Exposure Exclusion annually.
SECTION B: PERMITTED ACTIVITIES
Until this permit expires or is o 'fto evoked, the permittee is authorized to discharge
stormwater to the surface wate o - arolina or separate storm sewer system that
has been adequately treated d m , a d in accordance with the terms and conditions of
this permit. All stormwate ischar shall be in accordance with the conditions of this
permit.
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 permit shall not cause or contribute
to violations of Water Quality Standards.
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.
Part I Page 1 of 2

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Permit No. NCS000077
PART II MONITORING, CONTROLS, AND LIMITATIONS FOR
PERMITTED DISCHARGES
SECTION A: STORMWATER POLLUTION PREVENTION PLAN
The permittee shall develop and implement a Stormwater Pollution Prevention Plan
(SPPP). The SPPP shall be maintained on site unless exempted from this requirement by
the Division. The SPPP is public information in accordance with Part 111, Standard
Conditions, Section E, paragraph 3 of this permit. The SPPP shall include, at a minimum,
the following items:
1. Site Overview. The Site Overview shall provid d cr tion of the physical facility
and the potential pollutant sources that may b xp c ribute to
contamination of stormwater discharges. The Overvi ' _ shall contain the following:
(a) A general location map (USGS quadra
map), showing the facility's location
waters; the name of the receiving ;LE
Map - r-appropriately drafted equivalent
o transportation routes and surface
ich the stormwater outfalls
discharge, or if the discharge is t m ic' 1 separate storm sewer system, the
name of the municipali d lti receiving waters; and accurate latitude
and longitude of the poi . - st ater discharge associated with industrial
activity. The general to r alternatively the site map) shall identify
whether any receivin ateFin
impaired (on the state's 303(d) list of impaired
waters) or if the sit i locat watershed for which a TMDL has been
established, and wba�arameters of concern are.
(b) 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 that
could be expected to be present in the stormwater discharge from each outfall.
(c) A site map drawn at a scale sufficient to clearly depict: 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 and
finished grade; all drainage features and structures; drainage area boundaries and
total contributing area for each outfall; direction of flow in each drainage area;
industrial activities occurring in each drainage area; buildings; stormwater Best
Management Practices (BMPs); and impervious surfaces. The site map must
indicate the percentage of each drainage area that is impervious, and the site map
must include a graphic scale indication and north arrow.
(d) A list of significant spills or leaks of pollutants during the previous three (3) years
and any corrective actions taken to mitigate spill impacts.
Part II Page 1 of 11

Permit No. NCS000077
(e) Certification that the stormwater outfalls have been evaluated for the presence of
non-stormwater discharges. The permittee shall re -certify annually 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 III, Standard Conditions, Section B, Paragraph 3.
2. Stormwater Management Strategy. The Stormwater Management Strategy shall
contain a narrative description of the materials management practices employed which
control or minimize the stormwater exposure of significant materials, including
structural and nonstructural measures. The Stormwater Management Strategy, at a
minimum, shall incorporate the following: A>
(a) Feasibility Study. A review of the technic
the methods of operations and/or storage
of materials and processes to rainfall and
permittee shall prevent exposure of all A
and manufacturing or fueling operati
not practical, this review shall docu en
run-on away from areas of poten ' c to
dnicjeasibility of changing
;es Zfj—Xinate or reduce exposure
flows. Wherever practical, the
s, material handling operations,
where elimination of exposure is
fsibility of diverting the stormwater
tion.
(b) Secondary Containm t q ents and Records. Secondary containment is
required for: bulk stora ofi ' u aterials• storage in any amount of Section 313
of Title III of the Sua.,mcaoterials
ments and Reauthorization Act (SARA) water
priority chemicals;any amount of hazardous substances, in order to
prevent leaks and sminating stormwater runoff. A table or summary
of all such tanks an 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). 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 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 (5) years.
(c) BMP Summary. A listing of site structural and non-structural Best Management
Practices (BMPs) 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 on 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.
Part II Page 2 of 11

Permit No. NCS00007 i
3. Spill Prevention and Response Procedures. The Spill Prevention and Response
Procedures (SPRP) shall incorporate an assessment of potential pollutant sources based
on a materials inventory of the facility. Facility personnel responsible for implementing
the SPRP shall be identified in a written list inrnrpnrated into the SPRP a_nd 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. A>
4. Preventative Maintenance and Good House ep' %eRg
. A preventative
maintenance and good housekeeping program ed and implemented.
The program shall address all stormwater cont I . stems (if applicable), stormwater
discharge outfalls, all on -site and adjacent su ce a s and wetlands, industrial
activity areas (including material storage s, _ at ial handling areas, disposal areas,
process areas, loading and unloading ar s, roads), all drainage features and
structures, and existing structural B e ogram shall establish schedules of
inspections, maintenance, ho ee in ctivities of stormwater control systems,
as well as facility equipme ili a as, and facility systems that present a potential
for stormwater exposure or r a ollution where not already addressed under
another element of the SP In M ion of material handling areas and regular
cleaning schedules of th e area all be incorporated into the program. Timely
compliance with the es a lish schedules for inspections, maintenance, and
housekeeping shall be -a d and maintained in the SPPP.
S. 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 at the outfalls required in Part II B, C, and D of this
permit.
6. 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. The facility
personnel responsible for implementing the training shall be identified, and their
annual training shall be documented by the signature of each employee trained.
Part II Page 3 of 11

Permit No. NCS000077
7. Responsible Party. The SPPP shall identify a specific position or positions responsible
for the overall coordination, development, implementation, and revision of the SPPP.
Responsibilities for all components of the SPPP shall be documented and position
assignments provided.
8. SPPP Amendment and Annual Update. The permittee shall amend the SPPP
whenever there is a change in design, construction, operation, site drainage,
maintenance, or configuration of the physical features which may have a significant
effect on the potential for the discharge of pollutants to surface waters. All aspects of
the SPPP shall be reviewed and updated on an annual basis. The annual update
shall include:
(a) an updated list of significant spills or
(3) years, or the notation that no spi
Overview); I
(b) a written re-certif cation that the sto
the presence of non-stormwater di
(c) a documented re-evaluation ofA_
_
lutants for the previous three
urredPfelement of the Site
251ter outfalls have been evaluated for
, ement of the Site Overview);
ctiuYness of the on -site stormwater
BMPs (BMP Summary eleme of a "mwater Management Strategy).
(d) a review and comparison o e a alytical data to benchmark values (if
applicable) over e pa ar, 'n - ding a discussion about Tiered Response
status. The per 'tt s 11 a the Division's Annual Summary Data
Monitoring Repor Il) , available from the Stormwater Permitting
Unit's website ee' ni ring Forms' here:
htt ortal cdenr.o web w ws su n dessw).
The Director may noti h rmittee when the SPPP 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 SPPP to meet minimum
requirements. The permittee shall provide certification in writing (in accordance with
Part III, Standard Conditions, Section B, Paragraph 3) to the Director that the changes
have been made.
9. SPPP Implementation. The permittee shall implement the Stormwater Pollution
Prevention Plan and all appropriate BMPs to prevent contaminants from entering
surface waters via stormwater. Implementation of the SPPP 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 (5) years and made available to the Director or the Director's authorized
representative immediately upon request. '
Part II Page 4 of 11

Permit No. iNCS000077
SECTION B: ANALYTICAL MONITORING REQUIREMENTS
Analytical monitoring of stormwater discharges shall be performed as specified in Table 1.
All analytical monitoring shall he performed during a measureable storm event at each
stormwater discharge outfall (SDO). Only SDOs discharging stormwater associated with
industrial activity must be sampled (See Definitions).
A measurable storm event is a storm event that results in an actual discharge from the
permitted site outfall. The previous measurable storm event must have been at least 72 hours
prior. The 72-hour storm interval does not apply if the permittee is able to document that a
shorter interval is representative for local storm events during the sampling period, and the
permittee obtains avvroval from the local DWO Regional Office. See DeFnitions.
Table 1. Analytical Monitoring Requirem is
Discharge �- - 4
=" M4 -'tea urement
»Sample
Sample :
Ctiaracter>kshcs ._ _. _
Minits
Fre uen - _.
�T , e_
3.
,Location_:
Total Suspended Solids
m L
s i- nual
Grab
SDO
H
m L
s -annual
Grab
SDO
Nitrogen, Total
mg,�eemi-annual
Grab
SDO
Phosphorus, Total
semi-annual
Grab
SDO
Total Rainfall4
semi-annual
Rain
in a
Gauge
Footnotes:
1 Measurement Frequency: Twic per year during a measureable storm event
z Grab samples 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 (ROS) has been granted. A copy of the letter granting ROS shall be kept on site.
4 For each sampled measureable storm event, the total precipitation must be recorded. An on -site rain gauge
or local rain gauge reading must be recorded.
The permittee shall complete the analytical samplings in accordance with the schedule
specified below in Table 2, unless adverse weather conditions prevent sample collection
(see Adverse Weather in Definitions). 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. Inability to sample because of adverse weather conditions must be
documented in the SPPP and recorded on the DMR. The permittee must report the results
from each sample taken within the monitoring period (see Part III, Section E).
Part II Page 5 of 11

Permit No. NCS000077
Table 2. Monitoring Schedule
=Monitorin eriiod1�2
Number i
t Sam le. ,
:Start - q� ,a
- End
Year 1 - Period 1
1
Junel,20121
November 30, 2012
Year 1- Period 2
2
December 1, 2012
May 30, 2013
Year 2 - Period 1
3
June 1, 2013
November 30, 2013
Year 2 -- Period 2
4
December 1, 2013
May 30, 2014
Year 3 - Period 1
5
June 1, 2014
November 30, 2014
Year 3 - Period 2
6
December 1, 2014
May 30, 2015
Year 4 - Period 1
7
June 1, 2015
November 30, 2015
Year 4 - Period 2
8
December 1, 2015
May 30, 2016
Year 5 - Period 1
9
Jun 1, 16
November 30, 2016
Year 5 - Period 2
10
Dec b , 016
May 30, 2017
Footnotes:
1 Maintain semi-annual monitoring until either an(
permit is revoked or rescinded. The permittee m
before the submittal deadline (180 days before e:
under the permit The permittee must contin
process, even if a renewal permit is not issu un
2 If no discharge occurs during the sampli eri
indicating "No Flow" or "No Discharge:' hi 0
mit is i for this facility or until this
an application for renewal of coverage
io a considered for renewed coverage
'cal . nitoring throughout the permit renewal
ar piration of this permit.
permittee must submit a monitoring report
of the end of the sampling period.
Failure to monitor semi-annualterms immediately institutes monthly
monitoring for all parameter
months of monthly monitortif
monitoring schedule, unles
exceedances prompt a "Ti r
monitoring period does no
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). Exceedances 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, Tier Two, and Tier Three response actions below.
s, � � n e t measureable storm event. After six (6)
the ittee may return to asemi-annual sampling
WQ r uires continued monthly monitoring or benchmark
o" sponse. "No discharge" from an outfall during a
itute failure to monitor, as long as it is properly reported.
Table 3. Benchmark Values for Anal tical Monitoring
Disch_ar, a 0 ar�ac#eri`stic5
Units
Benchhmark
AWN
Total Suspended Solids
mg/L
100
PH
standard
6-9
Nitrogen, Total
mg/L
30
Phosphorus, Total
mg/L
2
Part II Page 6 of 11

Permit No. NCS000077
'r' Teriie:.4
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:
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 exceedance.
3. Identify potential and select the specific: source controls, operational controls, or physical
improvements to reduce concentrations of the parameters of concern, and 'or to bring
concentrations within the benchmark range.
4. Implement the selected actions within two months of spection.
S. Record each instance of a Tier One response in t P Jude e date and value of the
benchmark exceedence, the inspection date, th er nne o cting the inspection, the
selected actions, and the date the selected action w _ e implemented.
.j T;iedTk :- 3,
If: During the term of this permit, the firy
m in ults from two consecutive monitoring
periods are above the benchmark valude the benchmark range, for any specific
parameter at a specific dischar tf
Then: The permittee shall:
1. Repeat all the required ac ' ns tli above in Tier One.
2. Immediately institute nthly m toring for all parameters. The permittee shall conduct
monthly monitoring a e ry all where a sampling result exceeded the benchmark value for
two consecutive samp nthly (analytical and qualitative) monitoring shall continue until
three consecutive sample results are below the benchmark values or within 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. Benchmark exceedances for a different parameter separately trigger a tiered response.
S. Maintain a record of the Tier Two response in the SPPP.
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 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 revise, 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;
• require the permittee to perform upstream and downstream monitoring to characterize
impacts on receiving waters; or
• require the permittee implement site modifications to qualify for a No Exposure Exclusion.
Part II Page 7 of 11

Permit No. NCS000077
This site discharges to impaired waters experiencing problems with Aquatic Life and
Ecological/Biological Integrity. If a Total Maximum Daily Load (TMDL) is approved for
this segment of South Buffalo Creek, the permittee may be required to monitor for
pollutant(s) of concern in the future and submit results to the Division of Water Quality.
The Division will consider the monitoring results in determining whether additional BMPs
are needed to control the pollutant(s) of concern to the maximum extent practicable.
If additional BMPs are needed to achieve the required level of control, 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 Stormwater Pollution Prevention Plan.
SECTION C: QUALITATIVE MONITORING REQU
The purpose of qualitative monitoring is to evalua th effectiveness of the Stormwater
Pollution Prevention Plan (SPPP) and assess ne ou e f stormwater pollution.
Qualitative monitoring of stormwater outfall t formed during a measurable
storm event.
Qualitative monitoring require
representative outfall status.
specified in Table 4, and durin
is required to perform furthe
Response, below). Inabilit o
documented in the SPPP a - f
Only SDOs discharging
(See Definitions).
vis l nsp� of each stormwater outfall regardless of
Qga ' a ' onitoring shall be performed semi-annually as
q ee alytical monitoring events unless the permittee
[uali ti sampling per the Qualitative Monitoring
sam a ecause of adverse weather conditions must be
co d on the DMR (see Adverse Weather in Definitions).
r associated with industrial activity must be monitored
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.
Table 4. Qualitative Monitoring Requirements
©ischar a Characteristics
Fre uen - t
51
MonitoF.in
eflCal.10RZ
Color
semi-annual
SDO
Odor
semi-annual
SDO
Clarity
semi-annual
SDO
-Floating Solids
semi-annual
SDO
Suspended Solids
semi-annual
I SDO
Foam
semi-annual
I SDO
Part I1 Page 8 of 11

Permit No. NCS000077
Discharge Charactertst>Ics . Trequencyi
p�
�.
RMonitoring ry
"4
,LocationZ
Oil Sheen
semi-annual
SDO
Erosion or deposition at the outfall
semi-annual
SDO
Other obvious indicators
semi-annual
SDO
of stormwater pollution
Footnotes:
1 Measurement Frequency: Twice per year during a measureable storm event. See Table 2 for schedule of
monitoring periods through the end of this permitting cycle. The permittee must continue qualitative
monitoring throughout the permit renewal process until a new permit is issued.
Z Monitoring Location: Qualitative monitoring shall be performed Veastormwater discharge outfall
(SDO) regardless of representative outfall status. n
A minimum of 60 days must separate monitorin s, undditional sampling has
been instituted as part of other analytical monitorij&iVirements in this permit.
if the permittee's qualitative monitoring indriliof
sting stormwater BMPs are
ineffective, or that significant stormwater s present, the permittee shall
investigate potential causes, evaluate th arective actions, and implement
those corrective actions withi da erve Monitoring Response, below.
A written record of the perm ee i e ation, evaluation, and response actions shall be
kept in the Stormwater Pollutio re n ' Plan.
Qualitative monitoring is for�t-liF-purposes of evaluating SPPP effectiveness, assessing new sources
of stormwater pollution, and prompting the permittee's response to pollution. If the permittee
repeatedly fails to respond effectively to correct problems identified by qualitative monitoring, or if
the discharge causes or contributes to a water quality standard violation, DWQ may but is not
limited to:
• require that the permittee revise, increase, or decrease the monitoring frequency
(analytical or qualitative) for the remainder of the permit;
• require the permittee to install structural stormwater controls;
• require the permittee to implement other stormwater control measures;
• require the permittee to perform upstream and downstream monitoring to characterize
impacts on receiving waters; or
• require the permittee implement site modifications to qualify for a No Exposure Exclusion.
Part II Page 9 of 11

Permit No. NCS000077
SECTION D: ON -SITE VEHICLE MAINTENANCE MONITORING REQUIREMENTS
Facilities that 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. All analytical
monitoring shall be performed during a measureable storm event at all stormwater
discharge outfalls (SDOs) that discharge stormwater runoff from vehicle maintenance areas,
and in accordance with the schedule presented in Table 2 (Section B).
Table 5. Analytical Monitoring Requirements for On -Site Vehicle Maintenance
Dit'sce Charac eTt cS4
'' Units : AMeasu�`e
` ent
Sample'`
Samp el '.
ueUET 1_
eZ
ecation3 .
H
standard
AL Av
s i- aC'n& I
Grab
SDO
Non -Polar Oil & Grease /
TPH
mg/L
Kin uaI
Grab
SDO
EPA Method 1664 SGT-HEM
Total Suspended Solids
m L
m nnual
Grab
SDO
Total Rainfall4
inch
mi-annual
Rain gauge
New Motor Oil Usage
ftloonZ7'semi-annual
Estimate
-
Footnotes:
1 Measurement Frequency: Twic er yea u g a measureable storm event, until either another permit
is issued for this facility or un this per t s revoked or rescinded. See Table 2 for schedule of
monitoring periods through - end of is permitting cycle.
2 Grab samples shall be collecte within the first 30 minutes of discharge.
3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) that discharges
stormwater runoff from area(s) where vehicle maintenance activities occur.
4 For each sampled measureable storm event the total precipitation must be recorded. An on -site or local
rain gauge reading must be recorded.
Failure to monitor semi-annually per permit terms immediately institutes monthly
monitoring for all parameters, upon the next measureable storm event, as provided in Part
11 Section B.
Monitoring results shall be compared to the benchmark values in Table 6. The benchmark
values in Table 6 are not permit limits but should be used as guidelines for the permittee's
Stormwater Pollution Prevention Plan (SPPP). Exceedances 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 Part
11 Section B.
Part 11 Page 10 of 11

Permit No. NCS000077
Table 6. Benchmark Values for Vehicle Maintenance Analytical Monitoriniz
Dischar e,�Characteristics,
Uniits
-r .K., �1
i. Benchmark -n
PH
standard
6-9
Non -Polar Oil & Grease / TPH
[EPA Method 1664 (SGT-HEM)]
mg/L
15
Total Suspended Solids
mg/L
100
Part II Page 11 of 11

Permit No. NCS000077
PART III STANDARD CONDITIONS FOR NPDES STORMWATER INDIVIDUAL PERMITS
SECTION A: COMPLIANCE AND LIABILITY
Compliance Schedule
The permittee shall comply with Limitations and Controls specified for stormwater discharges in
accordance with the following schedule:
Existing Facilities already operating but applying for permit coverage for the first time: The
Stormwater Pollution Prevention Plan shall be developed and implemented within 12 months of the
effective date of the initial permit and updated thereafter on an annual basis. Secondary containment,
as specified in Part I1, Section A, Paragraph 2(b) of this permit, shall be accomplished within 12
months of the effective date of the initial permit issuance. , !�>
New Facilities applying for coverage for the first e: rmw r Pollution Prevention Plan
shall be developed and implemented prior to the be m of [ from the operation of the
industrial activity and be updated thereafter on an HE basis. ondary containment, as specified
in Part 11, Section A, Paragraph 2(b) of this permit s e complished prior to the beginning of
discharges from the operation of the industrial ate.
Existing facilities previously permitted
limitations, and controls contained in thi
shall become effective immed' tely u i
Pollution Prevention Plan f4ilk p d • i
months of the effective date o er 't
containment, as specified in P
beginning of discharges fre the
'd a 1 or renewal: All requirements, conditions,
r (e pt new SPPP elements in this permit renewal)
ss this permit. New elements of the Stormwater
en re�i Tshall be developed and implemented within 6
a updated thereafter on an annual basis. Secondary
ph 2(b) of this permit shall be accomplished prior to the
n of the industrial activity.
Duty to Comply
The permittee must comp with all conditions of this permit. Any permit noncompliance constitutes
a violation of the Clean Water Act (CWA) and is grounds for enforcement action; for permit
termination, revocation and reissuance, or modification; or denial of a permit upon renewal
application [40 CFR 122.41].
a. The permittee shall comply with standards or prohibitions established under section 307(a) of
the CWA for toxic pollutants within the time provided in the regulations that establish these
standards or prohibitions, even if the permit has not yet been modified to incorporate the
requirement"
b. The CWA provides that any person who violates section[s] 301, 302, 306, 307, 308, 318 or 405 of
the Act, or any permit condition or limitation implementing any such sections in a permit issued
under section 402, or any requirement imposed in a pretreatment program approved under
sections 402(a)(3) or 402(b)(8) of the Act, is subject to a civil penalty not to exceed $37,500 per
day for each violation. [33 USC 1319(d) and 40 CFR 122.41(a)(2)]
c. The CWA provides that any person who negligently violates sections 301, 302, 306, 307, 308,
318, or 405 of the Act, or any condition or limitation implementing any of such sections in a
permit issued under section 402 of the Act, or any requirement imposed in a pretreatment
program approved under section 402(a)(3) or 402(b)(8) of the Act, is subject to criminal
penalties of $2,500 to $25,000 per day of violation, or imprisonment of not more than 1 year, or
both. In the case of a second or subsequent conviction for a negligent violation, a person shall be
Part III Page 1 of 9

Permit No. NCS000077
subject to criminal penalties of not more than $50,000 per day of violation, or by imprisonment of
not more than 2 years, or both. [33 USC 1319(c)(1) and 40 CFR 122.41(a)(2)]
H. Any person who knowingly violates such sections, or such renditions or limitations is subject to
criminal penalties of $5,000 to $50,000 per day of violation, or imprisonment fur not more than 3
years, or both. In the case of a second or subsequent conviction for a knowing violation, a person
shall be subject to criminal penalties of not more than $100,000 per day of violation, or
imprisonment of not more than 6 years, or both. [33 USC 1319(c) (2) and 40 CFR 122.41(a)(2)]
Any person who knowingly violates section 301, 302, 303, 306, 307, 308, 318 or 405 of the Act, or
any permit condition or limitation implementing any of such sections in a permit issued under
section 402 of the Act, and who knows at that time that he thereby places another person in
imminent danger of death or serious bodily injury, shall, upon conviction, be subject to a Fine of
not more than $250,000 or imprisonment of not more than 1 ears, or both. in the case of a
second or subsequent conviction for a knowing endang t violation, a person shall be subject
AiEw
to a fine of not more than $500,000 or by imprihan 30 years, or both. An
organization, as defined in section 309(c)(3)(B, upon conviction of
violating the imminent danger provision, be suore than $1,000,000 and can
be fined up to $2,000,000 for second or subseqCoe
FR 122.41(a)[2)]
f. Under state law, a civil penalty of not mor n ,0 per violation may be assessed against
any person who violates or fails to act i cc ee ith the terms, conditions, or requirements
of a permit. [North Carolina General ut 11-215.6A]
g. Any person maybe ass a d 'nist penalty by the Administrator for violating section
301, 302, 306, 307, 3 18, 8 4 o is Act, or any permit condition or limitation
implementing any of such cti i ermit issued under section 402 of this Act.
Administrative penalti or C s iolations are not to exceed $16,000 per violation, with the
maximum amount o y Class nalty assessed not to exceed $37,500. Penalties for Class II
violations are not t9ficeed $11000 per day for each day during which the violation continues,
with the maximum Many Class II penalty not to exceed $177,500. [33 USC 1319(g)(2)
and 40 CFR 122.41(
3. Duty to Mitigate
The permittee shall take all reasonable steps to minimize or prevent any discharge in violation of this
permit which has a reasonable likelihood of adversely affecting human health or the environment [40
CFR 122.41(d)].
4. Civil and Criminal Liability
Except as provided iri Part III, Section C of this permit regarding bypassing of stormwater control
facilities, nothing in this permit shall be construed to relieve the permittee from any responsibilities,
liabilities, or penalties for noncompliance pursuant to NCGS 143-215.3, 143-215.6, or Section 309 of the
Federal Act, 33 USC 1319. Furthermore, the permittee is responsible for consequential damages, such
as Fish kills, even though the responsibility for effective compliance may be temporarily suspended.
Oil and Hazardous Substance Liability
Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the
permittee from any responsibilities, liabilities, or penalties to which the permittee is or may be
subject to under NCGS 143-215.75 et seq. or Section 311 of the Federal Act, 33 USC 1321.
6. Property Right
The issuance of this permit does not convey any property rights in either real or personal property, or
any exclusive privileges, nor does it authorize any injury to private property or any invasion of
Part III Page 2 of 9

Permit No. NCS000077
personal rights, nor any infringement of Federal, State or local laws or regulations [40 CFR
122.41(g)].
S--yerabiIitk
The provisions of this permit are severable, and if any provision of this permit, or the application of
any provision of this permit to any circumstances, is held invalid, the application of such provision to
other circumstances, and the remainder of this permit, shall not be affected thereby [NCGS 150B-23].
8. Duty to Provide Information
The permittee shall furnish to the Permit Issuing Authority, within a reasonable time, any information
which the Permit Issuing Authority may request to determine whether cause exists for modifying,
revoking and reissuing, or terminating the permit issued pursuant to this permit or to determine
compliance with this permit The permittee shall also furnish to the Permit Issuing Authority upon
request, copies of records required to be kept by this permit [40 C,411 122.41(h)].
10.
11.
Penalties for Tampering
The Clean Water Act provides that any person who
inaccurate, any monitoring device or method requi:
conviction, be punished by a fine of not more than 9
more than two years per violation, or by boAen
after a first conviction of such person unde
$20,000 per day of violation, or by impriso
fi to a or knowingly renders
be main ed under this permit shall, upon
D0 er violation, or by imprisonment for not
'on f a person is for a violation committed
p unishment is a fine of not more than
y�6re than 4 years, or both [40 CFR 122,41].
The Clean Water Act provid at p rsofiIia 5 knowingly makes any false statement,
representation, or certificati in y:*j,Cor other document submitted or required to be
maintained under this permit ' lutoringreports or reports of compliance or
noncompliance shall, upon nvicti n, punished by a fine of not more than $10,000 per violation, or
by imprisonment for not ore than years per violation, or by both [40 CFR 122.41].
This permit does not autiMFffe or approve the construction of any onshore or offshore physical
structures or facilities or the undertaking of any work in any navigable waters.
12. Duty to Reapply
If the permittee wishes to continue an activity regulated by this permit after the expiration date of
this permit, the permittee must apply for and obtain a new permit [40 CFR 122.41(b)].
SECTION B: GENERAL CONDITIONS
Permit Expiration
The permittee is not authorized to discharge after the expiration date. In order to receive automatic
authorization to discharge beyond the expiration date, the permittee shall submit forms and fees as
are required by the agency authorized to issue permits no later than 180 days prior to the
expiration date, unless permission for a later date has been granted by the Director. (The Director
shall not grant permission for applications to be submitted later than the expiration date of the
existing permit.) [40 CFR 122.21(d)]. Any permittee that has not requested renewal at least 180 days
prior to expiration, or any permittee that does not have a permit after the expiration and has not
requested renewal at least 180 days prior to expiration, will be subjected to enforcement procedures
as provided in NCGS §143-215.36 and 33 USC 1251 et. seq.
Part III Page 3 of 9

Permit No. NCS000077
2. Transfers
This permit is not transferable to any person without prior written notice to and approval from the
Director in accordance with 40 CFR 122.61. The Director may condition approval in accordance with
NCGS 143-215.1, in particular NCGS 143-215:1(b)(4)b.2., and may require modification or revocation
and relssuance of the pt cnlit, Ora Eulllor mudi ication, to identify the new periniLLee and incorpora e
such other requirements as may be necessary under the CWA (40 CFR 122-41(1)(3), 122.61] or state
statute. The Permittee is required to notify the Division in writing in the event the permitted
facility is sold or closed.
Signatory Requirements
All applications, reports, or information submitted to the Permitting issuing Authority shall be signed
and certified [40 CFR 122.41[k)].
a. All permit applications shall be signed as follows:
(1) For a corporation: by a responsible corporate ffi r. r the purpose of this Section, a
responsible corporate officer means: [a) a p lde se etary easurer or vice president of
the corporation in charge of a principal bus ess nc _ y other person who performs
similar policy or decision making functions or a corpo � on, or (b) the manager of one or
more manufacturing, production, or opera " a - 'ties, provided, the manager is authorized
to make management decisions which g th op ation of the regulated facility including
having the explicit or implicit duty of ng a]o apital investment recommendations,
and initiating and directing other c pr a iv easures to assure long term
environmental compliance with it e I laws and regulations; the manager can
ensure that the necessary sys e s ar ished or actions taken to gather complete and
accurate informal p pp n requirements; and where authority to sign
documents has bee ss e r egated to the manager in accordance with corporate
procedures.
(2) For a partnership sole p o torship: by a general partner or the proprietor, respectively;
or
(3) For a municip ► , State deral, or other public agency: by either a principal executive
officer or ranki e - official [40 CFR 122.22].
b. All reports required by the permit and other information requested by the Permit Issuing
Authority shall be signed by a person described in paragraph a, above or by a duly authorized
representative of that person. A person is a duly authorized representative only if:
(1) The authorization is made in writing by a person described above;
(2) The authorization specified either an individual or a position having responsibility for the
overall operation of the regulated facility or activity, such as the position of plant manager,
operator of a well or well field, superintendent, a position of equivalent responsibility, or an
individual or position having overall responsibility for environmental matters for the company.
(A duly authorized representative may thus be either a named individual or any individual
occupying a named position.); and
(3) The written authorization is submitted to the Permit Issuing Authority [40 CFR 122.22]
c. Changes to authorization: If an authorization under paragraph (b) of this section is no longer
accurate because a different individual or position has responsibility for the overall operation of
the facility, a new authorization satisfying the requirements of paragraph (b) of this section must
be submitted to the Director prior to or together with any reports, information, or applications to
be signed by ari authorized representative [40 CFR 122.22]
Part III Page 4 of 9

Permit No. NCS000077
d. Certification. Any person signing a document under paragraphs a. or b. of this section shall make
the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL
BE ACCEPTED:
"i certil5, under penalty of law, that this document and all attachments were prepared under my
direction orsupervision in accordance with a system designed to assure that qualified personnel
properlygother and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible forgathering the information,
the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. 1
am aware that there are significant penalties forsubmitting false information, including the
possibility of fines and imprisonment for knowing violations."
4. Permit Modification. Revocation and Reissuance. or Termination
The issuance of this permit does not prohibit the Permit Issuing Authority from reopening and
modifying die permit, revoking and reissuing the permit, or term' Ling the permit as allowed by the
laws, rules, and regulations contained in Title 40, Cod f FW Regulations, Parts 122 and 123;
Title 15A of the North Carolina Administrative Codech er .O1 ;and North Carolina
General Statute 143-215.1 eta].
5. Permit Actions
The permit maybe modified, revoked and reiss to i ed for cause. The notification of
planned changes or anticipated noncomplian o n s any permit condition [40 CFR
122.41(f)].
6. Annual AdministerinR and Comnlianc& nit Reauirements
The permittee must pay th Oak
d 'ni ri an mpliance monitoring fee within 30 (thirty) days
after being billed by the Divis ilu t ay the fee in timely manner in accordance with 15A
NCAC 2H .0105(b)(2) may c is vi ' n to initiate action to revoke the permit.
SECTION C: OPERATION AND 14WNTI TONCE OF POLLUTION CONTROLS
The permittee shall at all times properly operate and maintain all facilities and systems of treatment
and control (and related appurtenances) which are installed or used by the permittee to achieve
compliance with the conditions of this permit. Proper operation and maintenance also includes
adequate laboratory controls and appropriate quality assurance procedures. This provision requires
the operation of back-up or auxiliary facilities or similar systems which are installed by a permittee
only when the operation is necessary to achieve compliance with the conditions of this permit [40
CFR 122.41(e)].
2. Need 10 Halt or Reduce Not a Defense
It'shall not be a defense for a permittee in an enforcement action that it would have been necessary to
halt or reduce the permitted activity in order to maintain compliance with the condition of this permit
[40 CFR 122.41(c)],
3. Bypassing of Stormwater Control Facilities
Bypass is prohibited and the Director may take enforcement action against a permittee for bypass
unless:
a. Bypass was unavoidable to prevent loss of life, personal injury or severe property damage; and
b. 'There were no feasible alternatives to the bypass, such as the use of auxiliary control facilities,
retention of stormwater ar maintenance during normal periods of equipment downtime or dry
weather. This condition is not satisfied if adequate backup controls should have been installed in
Part III Page 5 of 9

Permit No. NCS000077
the exercise of reasonable engineering judgment to prevent a bypass which occurred during
normal periods of equipment downtime or preventive maintenance; and
c. The permittee submitted notices as required under, Part Ill, Section E of this permit.
If the DirecLur deteroiines that iL will oieet the Ll"iree cundiiiuns listed above, Lhe Director inay
approve an anticipated bypass after considering its adverse effects.
SECTION D: MONITORING AND RECORDS
Representative Samphnl3
Samples collected and measurements taker,, as required herein, shall be characteristic of the volume
and nature of the permitted discharge. Analytical sampling shall be performed during a measureable
storm event. Samples shall betaken on a day and time that is cha cteristic of the discharge. All
samples shall be taken before the discharge joins or is dilut ny other waste stream, body of
water, or substance. Monitoring points as specified i is shall t be changed without
notification to and approval of the Permit Issuing A or' 4 - , 41(j)].
2. Recording Results_
For each measurement or sample taken pursuant he q ments of this permit, the permittee
shall record the following information [40 CFF;
a. The date, exact place, and time of same ements;
b. The individual(s) who performed t a in measurements;
c. The dates) analyses v
d. The individual(s) who
e. The analytical techniqu?vs4es.s.
a dMsed; and
f. The results of such a
Flow Measurements
Where required, approp ' ow measurement devices and methods consistent with accepted
scientific practices shall he selected and used to ensure the accuracy and reliability of measurements
of the volume of monitored discharges.
4. Test Procedures
Test procedures for the analysis of pollutants shall conform to the EMC regulations published
pursuant to NCGS 143-215.63 et seq, the Water and Air Quality Reporting Acts, and to regulations
published pursuant to Section 304(g), 33 USC 1314, of the Federal Water Pollution Control Act, as
Amended, and Regulation 40 CFR 136.
To meet the intent of the monitoring required by this permit, all test procedures must produce
minimum detection and reporting levels and all data generated must be reported down to the
minimum detection or lower reporting level of the procedure. If no approved methods are
determined capable of achieving minimum detection and reporting levels below permit discharge
requirements, then the most sensitive (method with the lowest possible detection and reporting
level) approved method must be used.
Representative Outfall
If a facility has multiple discharge locations with substantially identical stormwater discharges that
are required to be sampled, the permittee may petition the Director for representative outfall status.
If it is established that the stormwater discharges are substantially identical and the permittee is
granted representative outfall status, then sampling requirements may be performed at a reduced
number of outfalls.
Part ll l Page 6 of 9

Permit No. NCS000077
6. Records Retention
Visual monitoring shall be documented and records maintained at the facility along with the
Stormwater Pollution Prevention Plan. Copies of analytical monitoring results shall also be
maintained on -site. The permittee shall retain records of all monitoring information, including
o all calibration and maintenance records,
o all original strip chart recordings for continuous monitoring instrumentation,
o copies of all reports required by this permit,
o copies of all data used to complete the application for this permit
These records or copies shall be maintained for a period of at least 5 years from the date of the
sample, measurement, report or application. This period may be extended by request of the Director
at any time [40 CFR 122.411.
Inspection and Entry
The permittee shall allow the Director, or an authorized re
contractor acting as a representative of the Directofau
in
through a municipal separate storm sewer system,operator or the separate storm sewer system receicredentials and other documents as may be require
a. Enter upon the permittee's premises whe
or where records must be ke4nteir
b. Have access to and copy, at reof this permit;
c. Inspect at reasonable ti s equipment), practices, or ad. Sample or monitor at reas otherwise authorized b e
CFR 122.41(i)].
SECTION E: REPORTING REQU
Discharae Monitoring Reports
five (including an authorized
c e of a cility which discharges
ri ,r entative of a municipal
lisch , upon the presentation of
,to:
F(cility or activity is located or conducted,
its permit;
s that must be kept under the conditions
moment (including monitoring and control
rated or required under this permit; and
,r the purposes of assuring permit compliance or as
Act, any substances or parameters at any location [40
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. DMR forms are available on the
Division's website (http^//portaLncde.nr.org/web/wq/ws/su/npdessw). 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 specified sampling period,
giving all required information and indicating "NO FLOW" as per NCAC T15A 02B .0506.
If the permittee monitors any pollutant more frequently than required by this permit using test
procedures approved under 40 CFR Part 136 and at a sampling location specified in this permit or
other appropriate instrument governing the discharge, the results of such monitoring shall be
included in the data submitted on the DMR.
The permittee shall record the required qualitative monitoring observations on the SDO Qualitative
Monitoring Report 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. Qualitative Monitoring Report forms are available at the website above.
Part III Page 7 of 9

Permit No. NCS000077
Submitting Reports
Two signed copies of Discharge Monitoring Reports (DMRs) shall be submitted to:
Ceiitrai Files
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
3. Availability of Report
Except for data determined to be confidential under NCGS 143-215.3(a)(2) or Section 308 of the
Federal Act, 33 USC 1318, all reports prepared in accordance with the terms shall be available for
public inspection at the offices of the Division. As required by the Act, analytical data shall not be
considered confidential. Knowingly making any false statement o any such report may result in the
imposition of criminal penalties as provided for in NCGS 14 , .6B or in Section 309 of the Federal
Act. A� n
4. Nan-Stormwater Discharge
If the storm event monitored in accordance with thi coincides with a non-stormwater
discharge, the permittee shall separately monitor ar e rs as required under all other
applicable discharge permits and provide this ' 'on th the stormwater discharge monitoring
report.
5. Planned Change
91
The permittee shall give no ' e t Dig cto�on as possible of any planned changes at the
permitted facility which cou i fic tl ter the nature or quantity of pollutants discharged [40
CFR 122.41(I)]. This notificat' re re t includes pollutants which are not specifically listed in
the permit or subject to no ' catio re 'rements under 40 CFR Part 122.42 (a).
The permittee shall giv a otice to the Director of any planned changes at the permitted
facility which may result ncompliance with the permit [40 CFR 122.41(1)(2)].
apills
The permittee shall report to the local DWQ Regional Office, within 24 hours, all significant spills as
defined in Part IV of this permit. Additionally, the permittee shall report spills including: any oil spill
of 25 gallons or more, any spill regardless of amount that causes a sheen on surface waters, any oil
spill regardless of amount occurring within 100 feet of surface waters, and any oil spill less than 25
gallons that cannot be cleaned up within 24 hours.
8. Bypass
Notice [40 CFR 122.41(m)(3)]:
a. Anticipated bypass. If the permittee knows in advance of the need for a bypass, it shall submit
prior notice, if possible at least ten days before the date of the bypass; including an evaluation of
the anticipated quality and affect of the bypass.
b. Unanticipated bypass. The permittee shall submit notice within 24 hours of becoming aware of
an unanticipated bypass.
9. Twenty-four Hour Reoortin
a, The permittee shall report to the central office or the appropriate regional office any
noncompliance which may endanger health or the environment. Any information shall be
provided orally within 24 hours from the time the permittee became aware of the circumstances.
A written submission shall also be provided within 5 days of the time the permittee becomes
aware of the circumstances.
Part I II Page 8 of 9

Permit No. NCS000077
The written submission shall contain a description of the noncompliance, and its causes; the
period of noncompliance, including exact dates and times, and if the noncompliance has not
been corrected, the anticipated time compliance is expected to continue; and steps taken or
planned to reduce, eliminate, and prevent reoccurrence of the noncompliance [40 CFR
122,41(1) (6)].
b. The Director may waive the written report on a case -by -case basis for reports under this section
if the oral report has been received within 24 hours.
c. Occurrences outside normal business hours may also be reported to the Division's Emergency
Response personnel at [phone], (800) 858-U368 or [phone].
10. Other Noncompliance
The permittee shall report all instances of noncomplijUe i
the time monitoring reports are submitted [40 CFR W.41,
11. Other _Information
Where the Permittee becomes aware that it failed
or submitted incorrect information in a permit ap
promptly submit such facts or information [4CF
orted under 24 hour reporting at
any relevant facts in a permit application,
Rh any report to the Director, it shall
(8)],
Part III Page 9 of 9

NCS000077
1. Act
See Clean Water Act.
4
PART IV DEFINITIONS
Adverse Weather
Adverse conditions are those that are dangerous or create inaccessibility for personnel, such as local
flooding, high winds, or electrical storms, or situations that otherwise make sampling impractical.
When adverse weather conditions prevent the collection of samples during the sample period, the
permittee must take a substitute sample or perform a visual assWment during the next qualifying
storm event Documentation of an adverse event (wit dat , and written narrative) and the
rationale must be included with your SPPP records. � er w ther es not exempt the permittee
from having to file a monitoring report in accordan , wi th schedule. Adverse events and
failures to monitor must also be explained and rep on the r ant DMR.
Allowable Non-Stormwater Discharges _
This permit regulates stormwater discharge -s in ter discharges which shall be allowed in
the stormwater conveyance system are:
a. All other discharges that are author' b no stormwater NPDES permit.
b. Uncontaminated.groundwater, f u ati n s, air -conditioner condensate without added
chemicals, springs, dis a es u on ated potable water, waterline and fire hydrant
flushings, water from fo 'n ra , ws from riparian habitats and wetlands.
c. Discharges resulting fro e- ti or fire -fighting training, or emergency shower or eye wash
as a result of use in t vent an mergency.
Measures or practices se uce the amount of pollution entering surface waters. BMPs may
take the form of a proce'91,07fivity, or physical structure. More information on BMPs can be found at:
http://cfl2ub,epa.gov/npdcsIstormwater/menuofbm12s/index.cfm.
5. Berns
A bypass is the known diversion of stormwater from any portion of a stormwater control facility
including the collection system, which is not a designed or established operating mode for the facility.
6. Bulk Storage of Liquid Products
Liquid raw materials, manufactured products, waste materials or by-products with a single above
ground storage container having a capacity of greater than 660 gallons or with multiple above ground
storage containers located in close proximity to each other having a total combined storage capacity
of greater than 1,320 gallons.
7. Certificate of Coverage
The Certificate of Coverage (COC) is the cover sheet which accompanies a General Permit upon
issuance and lists the facility name, location, receiving stream, river basin, effective date of coverage
under the permit and is signed by the Director.
8. Clean Water Act
The Federal Water Pollution Control Act, also known as the Clean Water Act (CWA), as amended, 33
USC 1251, et. seq.
R. Division or DM
The Division of Water Quality, Department of Environment and Natural Resources.
Part IV Page 1 of 4

Permit No. NCS000077
10. Director
The Director of the Division of Water Quality, the permit issuing authority.
11. EMC
The North Carolina Environmental Management Commission.
12. Grab Sample
An individual sample collected instantaneously. Grab samples that will be analyzed (quantitatively or
qualitatively) must be taken within the first 30 minutes of discharge.
13, Hazardous Substance
Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the Clean Water Act.
14. Landfill
A disposal facility or part of a disposal facility where waste ' ed in or on land and which is not a
-146 land treatment facility, a surface impoundment, an iio e haza ous waste long-term
storage facility or a surface storage facility, f . .
15. Measureable Storm Event
A storm event that results in an actual discharge
measurable storm event must have been at le
apply if the permittee is able to document t a
events during the sampling period, and o in
copies of this information and a writt qu
After authorization by the D�/ I e ' na Offi
permittee's SPPP.
16.
th e , itted site outfall. The previous
burs For. The 72-hour storm interval may not
M erval is representative for local storm
al from the local DWQ Regional Office. Two
shall be sent to the local DWQ Regional Office.
tten approval letter must be kept on site in the
A stormwater collectionktem wit Tian incorporated area of local self-government such as a city or
town.
17. No Exposure
A condition of no exposure means that all industrial materials and activities are protected by a storm
resistant shelter or acceptable storage containers to prevent exposure to rain, snow, snowmelt, or
runoff. Industrial materials or activities include, but are not limited to, material handling equipment
or activities, industrial machinery, raw materials, intermediate products, by-products, final products,
or waste products. DWQ may grant a No Exposure Exclusion from NPDES Stormwater Permitting
requirements only if a facility complies with the terms and conditions described in 40 CFR
§122.26(g).
18. NGLigef Int nt
The state application form which, when submitted to the Division, officially indicates the facility's
notice of intent to seek coverage under a General Permit.
19. Permit Issuing Authority
The Director of the Division of Water Quality (see "Director" above),
20. Permittee
The owner or operator issued this permit.
Part IV Page 2 of 4 Pages

Permit No. NCS000077
21. Point Source Discharge of Stormwater
Any discernible, confined and discrete conveyance including, but not specifically limited to, any pipe,
ditch, channel, tunnel, conduit, well, or discrete fissure from which stormwater is or may be
discharged to waters of the state.
22. Representative Outf ll Status
When it is established that the discharge of stormwater runoff from a single outfall is representative of the
discharges at multiple outfalls, the DWQ may grant representative outfall status. Representative outfall status
allows the permittee to perform analytical monitoring at a reduced number of outfalls.
23. Secondary Containment
Spill containmient for the contents of the single largest tank within the containment structure plus
sufficient freeboard to allow for the 25-year, 24-hour storm event.
24. Section 313 Water Prioritv Chemical
25.
A chemical or chemical category which:
b. Is listed in 40 CFR 372.65 pursuant to Section 3 of e o uperfund Amendments and
Reauthorization Act (SARA) of 1986, also titled mergen anning and Community Right -
to -Know Act of 1986;
c. Is present at or above threshold levels at a fa ' i su 'e o SARA title III, Section 313 reporting
requirements; and
d. Meets at least one of the following crite
i. Is listed in appendix D of 40 C ar 22 Table II (organic priority pollutants), Table III
(certain metals, cyanides, a ' he able IV (certain toxic pollutants and hazardous
substances);
ii. Is listed as a haza u ub n . ursuant to section 311(b)(2)(A) of the CWA at 40 CFR
116.4; or
iii. Is a pollutant fo ich A s published acute or chronic water quality criteria.
Substantial physical da ag operty, damage to the control facilities which causes them to
become inoperable, or su tial and permanent loss of natural resources which can reasonably be
expected to occur in the absence of a bypass. Severe property damage does not mean economic loss
caused by delays in production.
26, Significant Materials
Includes, but is not limited to: raw materials; fuels; materials such as solvents, detergents, and plastic
pellets; finished materials such as metallic products; raw materials used in food processing or
production; hazardous substances designated under section 101(14) of CERCLA; any chemical the
facility is required to report pursuant to section 313 of Title III of SARA; fertilizers; pesticides; and
waste products such as ashes, slag and sludge that have the potential to be released with stormwater
discharges.
27. Significant Spills
Includes, but is not limited to: releases of oil or hazardous substances in excess of reportable
quantities under section 311 of the Clean Water Act (Ref: 40 CFR 110.3and 40 CFR 117.3) or section
102 of CERCLA (Ref: 40 CFR 302.4).
28. Stormwater Discharge Outfall (SDO)
The point of departure of stormwater from a discernible, confined, or discrete conveyance, including
but not limited to, storm sewer pipes, drainage ditches, channels, spillways, or channelized collection
areas, from which stormwater flows directly or indirectly into waters of the State of North Carolina.
Part IV Page 3 of 4 Pages

Permit No. NCS000077
29. Stormwater Runoff
The flow of water which results from precipitation and which occurs immediately following rainfall
or as a result of snowmelt.
30. Stormwater Associated with industrial Activity
The discharge from any point source which is used for collecting and conveying stormwater and
which is directly related to manufacturing, processing or raw material storage areas at an industrial
site. Facilities considered to be engaged in "industrial activities" include those activities defined in 40
CFR 122.26(b)(14). The term does not include discharges from facilities or activities excluded from
the NPDES program.
31. Stormwater Pollution Prevention Plan
A comprehensive site -specific plan which details measures and practices to reduce stormwater
pollution and is based on an evaluation of the pollution potential the site.
32. Total Maximum Daily Load (TMDL]
TMDLs are written plans for attaining and maintaikgw 11 ndards, in all seasons, for a
specific water body and pollutant. A list of approvfor t to of North Carolina can be
found at httD://t)ortal.ncdenr.ore/web/wa/ns/.
33. Toxic Pollutant
Any pollutant listed as toxic under Section
34. Vehicle Maintenance Activity.
Vehicle rehabilitation, mec I I
or airport deicing operations.
35. Visible Sedimentation
36.
Solid particulate matter, 5th mine
gravity, or ice from its s of origW
lean Water Act.
fueling, lubrication, vehicle cleaning operations,
Ind organic, that has been or is being transported by water, air,
ich can be seen with the unaided eye.
The maximum 24-hour precipitation event expected to be equaled or exceeded, on the average, once
in 25 years.
Part IV Page 4 of 4 Pages

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PROPERTY OF
KENNETH A. HENDRICKS
D.B. 3476 PG. 39
P.B. 81 PG. 33
TO HOLDEN ROAD ---

Ain
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Energy, Mineral, and Land Resources
Tracy E. Davis, PE, CPM
Director
Owner/Company:
Facility Name:
NPDES Permit Number
Expiration Date:
Facility Location:
Type of Activity:
SIC Code or Description:
Receiving Streams:
River Basin:
Stream Classification:
Proposed Permit Requirements
Response Requested by (Date):
Central Office Staff Contact:
Pat McCrory, Governor
John E. Skvarla, III, Secretary
STAFF REVIEW AND EVALUATION
NPDES Stormwater Permit
Regional Office: WSRO
Dow Corning Corporation
Dow Corning Corporation
NCS000077
April 26, 2012
2914 Patterson Street, Greensboro, NC (Guilford County)
Plastics Material and Resin Manufacturing
2821
UT to South Buffalo Creek
Cape Fear River Basin, Sub -basin 03-06-02
WS-V; NSW
See attached draft permit.
September 19, 2014
Aana Taylor -Smith, [phone]
Central Office Review Summary:
1. Special Issues: Representative Outfall Status formerly in effect in 2007 no longer applies.
2. Changes at the facility since previous permit: Representative Outfall Status previously in effect in 2007
no longer applies. A new outfall (006) has been added near the secondary containment area beside
Building 3.Outfall 002 was moved to the front of Building 2. Dow Corning now monitors six outfalls for
all parameters.
o Name/Ownership changes: Owner is Jake Fitzgerald. New site contact is Ronica Edgerton.
o No significantly different production materials/processes.
o Site changes: A new warehouse was installed around Building 2 in 2010. The TSE tank farm is
located within secondary containment and is the location of Outfall 006. All ASTs are contained
within appropriate secondary containment with locked and secured valves that are monitored as
required.
3. Receiving Waters: Site drains to an unnamed tributary to South Buffalo Creek, Stream Index Number 16-
11-14-2a (from source to McConnell Road). This 15.4-mile section was impaired in 1998 for biological
integrity and 2006 for turbidity standard violation. As of the 2012 303(d) list, the section is listed as
impaired for ecological/biological integrity (benthos) since 2008 and ecological/biological integrity
Pagel of 3

NCS000077
NCS000077
Recommendations:
(fish) in 2012. There are no changes or new parameters on the draft 2014 303(d) list.
Based on the documents re
4.
Threatened and Endangered Species: No new notable species. Refer to Natural Heritage Program Map
information obtained Septe�
Viewer htt /portal.ncdenr.or web/nh nh ma viewer
( �-g/-------� p- p- )
Central Office recommends i
5.
Analytical and/or qualitative monitoring during this past permit cycle:
proposed draft permit reflec
o Facility has good compliance record with qualitative and quantitative monitoring. Occasional low
language, incorporating rev,
pH values have been attributed to sampling error and resolved.
c The consistent high TSS values that were seen in previous years have not been an issue recently
Prepared by (Signature)
since construction has finished. Occasional elevated TSS levels may be attributable to off -site
asphalt plants/other industrial activity.
Stormwater Permitting Sups
6.
Rationale for monitoring parameters: Current monitoring parameters are appropriate to encompass
industrial activity on site. See below for rationale for benchmarks (from SPU guidance):
o TSS: National Urban Runoff Program (NURP), 1983
Concurrence by Regional Of
o pH: Water Quality Standard
RO DEMLR Supervisor
o Nitrogen, Total: TKN + Nitrate + Nitrite benchmarks
o Phosphorus, Total: BPJ, based on wastewater permit limits for NSW
7.
Permit. Facility, and Owner Contacts updates:
❑ Confirmed contact information with permittee and updated BIMS if necessary.
❑ Obtained e-mail addresses for each contact and updated BIMS.
8.
Annual Fees:
❑ Confirmed in BIMS that permittee does not owe fees.
REGIONAL OFFICE STAFF COMMENTS:
Please note changes/updates in this permit as follows:
a Permittee must document total precipitation for each rain event. If no discharge occurs during
the sampling period, permittee must submit a monitoring report indicating "No Flow" within 30
days of the end of the sampling period. Samples must be taken a minimum of 60 days apart under
normal permitted sampling conditions.
o Benchmarks for analytical monitoring have been added to this draft permit. Exceedances require
the initiation of a tiered response program that involves increased monitoring, management
actions, record -keeping, and/or Best Management Practice (BMP) installation. See draft permit
for tiered response guidelines.
o Permittee must collect all analytical and qualitative monitoring samples during measurable
storm events as defined in Part 11 Section B.
o The flow reporting requirement has been removed per DENR revised strategy.
o Vehicle maintenance monitoring has been revised to a semi-annual schedule, where applicable.
o Site map must now identify whether a receiving stream is impaired and if it has a TMDL. It must
also describe potential pollutants in each outfall. A list of significant spills in the past three years
must be provided. Outfalls must be inspected and certified to ensure that they do not contain
non-stormwater discharges. See Part 11 Section A of draft permit.
o The facility must now implement a semi-annual Facility Inspection Program of the site's
stormwater management controls (Part 11 Section A).
o Information regarding the No Exposure Exclusion has been added to this draft permit. See Part I
Section A
Page 2 of 3

North Carolina
Beverly Eaves Perdue
Governor
MCDENR
Department of Environment and Natural Resources
Division of Water Quality
Charles Wakild,PE
Director
June 8, 2012
MEMORANDUM
TO: Bradley Bennett, Supervisor
Stormwater Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
FROM: Michael M. Mickey / WSRO
SUBJECT: Dow Corning Renewal Comments
Permit No. NCS000077
Guilford County
Dee Freeman
Secretary
The following comments are in response to questions posed by Jennifer Jones in her Staff Review and Evaluation:
1) Representative Outfall Status?: Due to construction changes at the facility the representative outfall status
granted in the Divisions May 2, 2007 letter is no longer applicable (sampling outfall #2 as representative of
outfall # 1). Dow Corning has resumed sampling at outfall # 1.
2) Require sampling for BOD and COD?: Dow Corning was inspected on 6/6/12 (see letter attached). The
facility appeared to be clean and well managed. However, there are large quantities of chemicals in
tankers, totes/drums and above ground tanks that drain to outfalls 45 and #6. For that reason, sampling for
COD may be appropriate.
3) Sample results for 2007-2010 and 2012?: During the inspection analytical results could only be produced
for 2011. According to Dow personnel, sample collection from 2008 through 2010 was difficult to low
storm flow conditions (WSRO's 9/24/10 inspection letter also mentioned this). For 2012, sampling just
occurred on May 30, 2012 and the results were not available from the laboratory yet. Qualitative
monitoring was performed for years 2008-2012.
Other notes:
The September 21, 2011 analytical sampling event revealed benchmark exceedences for TSS at outfalls 2, 5, and 6
and pH at outfalls 5 and 6. A re -sampling of outfalls 2, 5, and 6 on October 19, 2011 showed all parameters to be
below benchmark values. The company attributed the TSS and pH benchmark exceedences to major construction
around building #2. Aerial photos on the Guilford County GTS web site confirm the construction.
The facility has six outfalls. After discussion during the inspection it was decided that outfall 92 should be
relocated closer to the property boundary. Attached are updated pdf's showing the outfall locations.
Please let me know if you have any further questions.
North Carolina Division of Water Quality, Winston-Salem Regional Office
Location: 585 Waughtown St. Winston-Salem, North Carolina 27107
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
fntemet: www.ncwaterquaifty.org
An Equal Opportunity 1 Affirma've Action Employer
NorthCarolina
;Vaturallrf

Print Preview http://gcgis.co.guiIford.nc.us/guiIford_new/printPreview.aspx?Print...
Guilford County, NC
Old Parcel Number
000003010000300003A
Condo Book
Parcel Number
0033287
Condo Page
PIN
7854316985
Total Assessed Value
$0
Owner Name
SOUTHERN RAILWAY CO
Total Building Value
$2,100
Mailing Address 1
600 WEST PEACHTREE SUITE 1650
Total Out Building Value
$0
Mailing Address City
ATLANTA
Total Land Value
$2,110,500
Mailing Address State
GA
Total Deferred Value
$0
Mailing Address Zip
30306
Building Count
Property Address
3303 SPRING GARDEN ST
Building Number
Legal Desc 1
Lot # 46.90 AC YARD
Year Built
Land Units
46.9000
Heated Area
Deed Book
Bedrooms
Deed Page
Bathrooms
Plat Book
Use Code
Encumbered
Plat Page
Appraisal Model Code
Disclaimer: While every effort is made to keep information provided over the internet
accurate and up-to-date, Guilford County does not certify the authenticity or accuracy of Map Scale
such information. No warranties, express or implied, are provided for the records and/or 1 inch = 399 feet
1 of 2 6/6/2012 2:31 PM

Print Preview
http://gegis.co.guilford.nc.us/gui [ford_new/printPreview.aspx?Print...
mapping data herein, or for their use or interpretation by the User.
2 of2 6/6/2012 2:31 PM

STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Permit Number:NCS_ or, r.'cij or
Certificate of Coverage Number: NCG
FACILITY NAME DGWIV_ f,
PERSON COLLECTING SAMPLEO P d La: -
CERTIFIED LABORATORY(S) I Lab # 40
Lab #
Part A: Specific Monitoring Requirements
SAMPLES COLLECTED DURING CALENDAR YEAR: 20 I tI t
(This monitoring report shall be received by the Division no later than 30 days from
the date the facility receives the sampling results from the laboratory.)
COUNTY 47LU')�crd
PUDWE N . (3-zL- ) 54,7- -it2-c
.-1
(SIGNATUIkE dF PERMTI TEE OR DESIGNEE)
By this signature. I certify thak this report is accurate
complete to the best of my knowledge.
Outfall
No.
Date
Sample
Collected
50050 `
Total
Flow (if app.)
Total
Rainfall
T I��cl�c�
S
iS
nl7
Ns}r cr�erit�
mo/dEa
MG
'inches
.r� )r
+►�A �
. jL
col 'r
n,
t
f
}
V!i
^4-7
'✓
i ! 1 'q.j
Id�tVi/s
r1, 1 G
0, CiZ
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? _ yes 2c no
(if ves, complete Part B)
Part B- Vehicle Maintenance Activity Monitoring- Requirements
Outfall
No.
`
Date
Sample
Collected
50050 `
00556
00530
00400
Total Flow
(if applicable)
Total Rainfall
Oil & Grease
(if appl.)
Non -polar
O&G/TPH
(Method 1664
SGT-HEM), if
aPPL
Total
Suspended
Solids
pH
New Motor 09
Usage
mo/dd/vr
MG
inches
RIO
Units
gWM0
y
P ,,,, CU7TT..,)A4 in

STORM EVENT CHARACTERISTICS:
Date
Total Event Precipitation (inches):��r
Event Duration (hours): (only if applicable - see permit.)
(if more than one storm event was sampled)
Date
Total Event Precipitation (inches): t: • t
Event Duration (hours): (only if applicable — see permit.)
Mail Original and one copy to:
Division of Water Quality
Attn: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-16I7
"I certifv, under penalty of law, that ibis document and all attac#ments were prepared under my direction or supervision in accordance with a
system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person
or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best
of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information,
includuig, the possibility of fines and imprisonment for knowing violations."
of
I111-;j_l(
(DateY i

STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Permit Number NCS 0000 T1
FACILITY NAME DQkV _Grnind' — (jW&,&YQ &k-
PERSON COLLECTING SAMP (S) _ 4 &Wly�___ _
CERTHUDLABORATORY(S) Ptrr IiruflVk _Lab##_s__-_
7.Lab #
Part A: Specific Monitoring Requirements
SAMPLES COLLECTED DURING CALENDAR YEAR: i011
(This monitoring report shall be received by the Division no later than 30 days from
the date the facility receives the sampling results from the laboratory.)
1Lf1W""I
NO 20
(S11;NATU14E 04 PERNUITEE AID DESIGNEE)
By this signaturv, I certify that report is accurate
complete to the best of my lmowl e.
�.
1
Date
Sample
Collected
I11 I f
1 1+.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? _yes _✓no
(if yes. complete Part B)
Part B: Vehicle Maintenance Activity_Monitoring Requirements
Outfall
No.
Date
Sample
Collected
'50050
00556
00530
00400
Notal Flow
'(if applicable)
Total
Rainfall
Oil & Grease
(if appQ
Non -polar
O&G/TPH
(Method 1664
SGT-H M, if
aupl.
Total
Suspended
Solids
pH
New Motor
Oil Usage
moldd/yr
MG
inches
unit
aUmo
Form SWU-247-062310
Page 1 of 2

STOMM EVENT CHARACTERISTICS:
Date 5
Total Event Precipitation (inches):
Event Duration (hours): (only if applicable — see permit.)
(if more than one storm event was sampled)
Date
Total Event Precipitation (inches): T
Event Duration (hours); (only if applicable — see permit.)
Mail Oniginal and one copy to:
Division of Water Quality
Attu: Central Piles
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a
system designed to assure that qualsfied personnel properly gather and evaluate the information submitted. Based on my inquiry of the person
or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best
of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
:� Lkj t==4 - -I
(Sign�ture of Pirmittofe) (Dpt
Form SWU-247-0623I0
Page 2 of 2

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SCALE
s DOW CORNING CORPORATION SITE DRAINAGE MAP
' PROJECT NO. 104-0011 STORM WATER CISCHARGE PERMIT RENEWAL
DOW RNING CORPORATION
GRENSBORO GUIL EFORD COUNTY. NORTH CAROLINA CARDINAL
.�i0 ORwri Wtt Mi... CrR� or,T[ ♦Pevo v,re C�n.on o.x a>/2s/1 S GCO r,.T sITE PUN a-10-t pU:rNC No. S EV 7 o 2 — .S NOSEtl R E SO U R C ES 4M4gr: 1

.y
October 4, 2011
Mr. Bradley Bennett, Supervisor
Stormwater and General Permits Unit
NCDENR " L�
1617 Mail Service Center OCT - 5 D
Raleigh, NC 27600-1617 PE 2011
KEkQ;i Wi1TER
Mrestrrr
Dear Mr, Bennett: 0ftWH
The Dow Corning Greensboro site has completed the application and supplemental
information required for the renewal of the NPDES Stormwater permit NCS000077. This
information includes a signed certified renewal application form, current maps from the
Stormwater Pollution Prevention Plan, a summary of the analytical and visual monitoring results,
description of significant changes and a summary of the best management practices.
If you should have any questions or concerns, please contact Ronica Edgerton (336)547-
7120.
Sincerely,
DOW CORNING CORPORATION
Pamela Berry
Site Manager

of y1Arf4 Permit Coverage
Renewal Application_ Form
Y National Pollutant Discharge Elimination System Permit Number
Stormwater Discharge Permit NC5000077
The following is the information currently in our database for your facility. Please review this information carefully and
make all corrections/additions as necessary in the space provided to the right of the current information.
Owner Affiliation Information
Owner / Organization !Name:
Owner Contact:
Mailing Address:
Phone Number:
Fax Number:
E-mail address:
* Reissued Permit will be marled to the owner address
Dow Corning Corporation
Ms. Jane Waldorn
2914 Patterson St
Greensboro, NC 27407
[phone]
Facility/Permit Contact Information
Facility Name:^� Dow Corning Corporation
Facility Physical Address: 2914 Patterson St
Greensboro, NC 27407
Facility Contact:
Mailing Address:
Phone Number: A
Fax Number:
E-mail address:
A.
Discharge Information
Receiving Stream South Buffalo Creek
Stream Class: WS-V;NSW
Basin: Cape Fear River Basin
Sub -Basin: 03-06-02
Number of Outfalls:
Impaired Waters/TMDL
Does this facility discharge to waters listed as impaired or waters with a finalized TMDL? ❑ Yes Gf No ❑ Don't Know
( for information on these waters refer to http://h2o.enr.state.nc.us/su/Impaired Waters TMDL/ )
R�Vg 5
CERTIFICATION ~ 5 2011
vATERUJNSTY
I certify that I am familiar with the information contained in the application and that to the be w�
belief such information is true, complete and accurate.
Signature Date
Tj pa Ji t G o f M ►-
Print or type name of person signi g above Title
Please return this completed renewal application form to: Stormwater Permitting Unit
Attn: Brian Lowther
1617 Mail Service Center
Raleigh, North Carolina 27599-1617

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Qualitative Monitoring Results
6/29/2007
Parameters
Outfall #2
Outfall #3
Outfall #4
Outfall #5
Color
OK
OK
OK
OK
Odor
OK
OK
OK
OK
Clarity
OK
OK
OK
OK
Floating Solids
OK
OK
OK
OK
Suspended Solids
OK
OK
OK
OK
Foam
OK
OK
OK
OK
Oil Sheen
OK
OK
OK
OK
Other
None
None
None
None
]Vote: Outfall #1 N/A due to Outfall #2 being representative of Outfall #1
5/12/2011
1. Outfall Description
Outfall #1
Outfall #2
Outfall #3
Outfall #4
Outfall #5
Structure
Pipe
Pipe
Pipe
Pipe
Pipe
Receiving Stream
Buffalo Creek
Buffalo Creek
Buffalo Creek
Buffalo Creek
Buffalo Creek
Industrial activity description
that occur within the outfall
drainage area:
Warehouse,
maintenance
shop, adjacent
neighbor
Warehouse, Office
Warehouse,
Office, truck traffic
Warehouse, truck
traffic
Chemical
Manufacturing,
truck loading
2. Color
Clear
Clear
Clear
Clear
Clear
3.Odor
None
None
None
None
None
4.Clarity
1
1
1
1
1
5. Floating Solids
1
1
1
1
1
6. Suspended Solids
1
1
1
1
1
7. Is there any foam in
stormwater discharge
No
No
No
No
No
8. is there an oil sheen in
stormwater discharge
No
No
No
No
No
9. Evidence of erosion or
deposition at the outfall?
No
No
No
No
No
10. Other
None
None
None
None
None
Additional Visual Monitioring was conducted on; 11/13/2007, 6/30/2008, 11/21/2008, 6/30/2009, 5/12/2011
Outfall #1 in 2011 was monitored due to the warehouse addition to Building 2.

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Quantitative Monitoring Results
5/12/2011
Parameters
Units
Outfall #1
Outfall #2
Outfall #3
Outfall #4
Outfall #5
Total Rainfall
inches
0.3
0.3
0.3
0.3
0.3
Total Suspended Solids
mg/L
14
6.7
8.3
ND
ND
Total Nitrogen
mg/L
8.7
1.1
2.9
2.5
0.64
Total Phosphorus
mg/L
0.2
0.052
ND
ND
ND
Note: The Dow Corning Facility documented issues in the past with obtaining outfall samples. This was discussed
during an Compliance Evaluation Inspection conducted on September 21, 2010. Please see the attached document.

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Best Management Practices
September 2011
Best Management Practices (BMPs)
Best management (BMPs) includes proper equipment design and operation, manufacturing and
material handling procedures, structural controls and landscaping practices.
• Spill Containment Structures: Containment structures are constructed of concrete and
concrete block. All containment structures are sized to hold the contents of the largest
tank in addition to accumulated rainwater. Each containment structure has the maximum
level for rainwater clearly marked such that the structure will still hold the contents of the
largest storage tank.
• Drainage from Containment Areas: All containment areas have manually operated
valves or pumps, which remain closed and locked when not in operation. Drain valves
are on/off type — no flapper type valves are used. Accumulated stormwater is inspected
and inspection results are documented before stormwater is released. Only trained
personnel may inspect and release stormwater.
• Storage Tank Design and Installation: All storage tanks are constructed of materials
compatible with material stored and operating pressure and temperature. All storage
tanks have concrete secondary containment structures. All bulk storage tanks have high
level interlocks that will stop material transfer when tripped.
• Material Loading/Qnloadin : All bulk material handling is performed in spill -contained
areas. Standard Operating Procedures are required for all bulk material handling
operations and checklists are used for each transfer. Only trained personnel are permitted
to load or unload material.
• Preventative Maintenance: The Site's preventative maintenance program includes
inspections of bulk storage tanks, loading stations, transfer piping, spill containment
structures, high Ievel alarms, critical process equipment and instrumentation.
• Inspections: The site's Environmental, Health and Safety team conduct monthly
inspections of the stormwater outfall as well as semi-annual inspections for the
qualitative monitoring requirement.

• Personnel Training and Instruction: All process operators receive basic environmental
awareness and safety training before beginning specific process training. A qualified
operator must train all process operators before they are allowed to operate any process
alone. Corporate policy requires standard operating procedures (SOPS) for process
operations.
• Production Areas: All production operations are conducted in enclosed buildings.
• Particulate Emission Control: All processes handling particulates have dust collectors to
control particulate emissions. All dust collectors are part of the Site's preventative
maintenance program
• Housekeeping: Housekeeping inspections are conducted monthly by each production
building. This helps to ensure the areas are maintained properly and to prevent safety
hazards.
• Security: All buildings are locked and there is limited access to the production buildings
due to established badge accessible fenced in areas.
• Erosion Prevention and Control: Parking areas are concrete and asphalt. The remaining
ground is covered with grass, shrubs, and trees. Landscaping and contouring of the site
grounds have been utilized to minimize run-off of stormwater from non-
production/storage areas into active chemical usage and storage areas.

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Site Changes Summary
September 2011
The Dow Corning Greensboro site has had two significant changes since the previous renewal
period. As a result of these changes, the stormwater outfall collection sources have been
modified to accurately reflect the stormwater drainage.
• A warehouse was installed around Building 2 and placed into operation on Sept. 2010.
There is a new stormwater drainage basin as denoted in the map as Outfall #2, which is
located east of Building 2. A new drainage basin was also installed in front of the
building on the west side which drains to Outfall No. 3.
• The TSE tank farm has a drainage valve from the secondary containment area in which
the outlet opens to the soil. This valve is monitored closely and only opened to release
rainwater from the secondary containment area. This has been added as Outfall No. 6 to
the stormwater plan.

North Carolina Division of Water Quality - Stormwater Permitting Unit
Facility Name: Dow Corning Corporation
Permit Number: NC5000077
Location Address: 2914 Patterson St
Greensboro, NC 27407
County: Guilford
"I certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all
attachments were developed and implemented under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information required by the SPPP.
Based on my inquiry of the person or persons who manage the system, or those persons directly responsible
for gathering the information, the information gathered is, to the best of my knowledge and belief, true,
accurate and complete."
And
"I certify that the SPPP has been developed, signed and retained at the named facility location, and the SPPP
has been fully implemented at this facility location in accordance with the terms and conditions of the
stormwater discharge permit."
And
"I am aware that there are significant penalties for falsifying information, including the possibility of fines and
imprisonment for knowing violations." '
Sign (according to permit signatory requirements) and return this Certification. DO NOT
SEND STORMWATER POLLUTION PREVENTION PLAN WITH THIS CERTIFICATION.
Signature
Print or type name of person signin§ above
Date 4. �dl
0 6 Aqg r
Title
SLIPP Certifica, ion 5/0 )

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Wafer Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
24 September 2010
Ms. Kelle Beatty, Environmental Engineer
Dow Corning
2914 Patterson Street
Greensboro, North Carolina 27407
SUBJECT: Compliance Evaluation Inspection
Dow Corning
NPDES Permit No. NCS000077 & NCO088773
Guilford County
Dear Ms. Beatty:
Dee Freeman
Secretary
A Compliance Evaluation Inspection was performed on the Dow Corning groundwater remediation system and stormwater
facilities on September 21, 2010 by Corey Basinger of the Winston-Salem Regional Office. You were present for the
inspection. The inspection consisted of two parts: an on -site inspection of the stormwater facilities and an in -office file
review. The following are the findings from the subject inspection.
L. Permit
'The NPDES permit for groundwater remediation discharge (NC0088773) became effective on February 1, 2009 and
expires on June 30, 2011. The NPDES permit for stormwater discharge (NCS000077) became effective on April 27, 2007
and expires on April 26, 2012.
11. Records/Reports
A review of the Stormwater Pollution Prevention Plan (SPP Plan) revealed thatallareas of concern had been -addressed.
The SPP Plan was very comprehensive and well organized.
A review of the records associated with NCO0887733 revealed that the facility was in compliance with permit
requirements.
]It. Facility Site Review
All outfalls noted in the SPP Plan were inspected and found to be satisfactory. The facility requested representative outfall
status for Outfall 002 in a letter dated March 29, 2007 and was approved on April 24, 2007. Since that time, the site has
been modified and the topography of the site has changed slightly. You indicated that facility staff was having a difficult
time collecting a stormwater sample at several of the outfalls due to the fact that very little stormwater was present in the
storm sewer pipes. It may be helpful to wait until later in the representative storm event to collect the sample in order to
allow the stormwater to enter the storm sewer system. If you continue to have difficulties with collecting a stormwater
sample, please contact this office and we will assist you in determining a viable solution.
The groundwater remediation system discharges across Patterson Street into an unnamed tributary to South Buffalo Creek.
Please remember to maintain access to the discharge point at all times.
IV. Effluent & Receiving Waters
Dow Corning discharges treated groundwater and stormwater to an unnamed tributary to South Buffalo Creek in the Cape
Fear River Basin.
V. Self -Monitoring Program
All monitoring requirements required by NPDES Permit NCO089773 have been met.
North Carolina Division of Water Quality, Winston-Salem Regional Office
Location: 585 Waughtown St, Winston-Salem, North Carolina 27107
Phone: [phone] FAX: [phone] Customer Service: 1.877-623-6748
Internet: www.ncwaterquafity.or9
One
NorthCarolina
A)Wumllu
An 7Equai Oppoovnity ; Affinnalive Action Employer

Form Approved
A�
OMB No.2040-0057
Approval Expires
8-31-98
United States Environmental Protection AgenFy, Washington, D.C. 20460
Section A: National Data System Coding
Transaction Code NPDES No. Yr/Mo/Day Inspection Type Inspector FacilityType
N 5 NCS000077 10-09-21 C S 2
Facility Evaluation Rating BI QA ..........Reserved...........
4 N N
Section B: Facility Data
Name and Location of Facility Inspected:
Entry Time:
Permit Effective
1000 hrs.
Date: April 27, 2007
Dow Corning Facility -- Greensboro
Located at 2900 Randolph Avenue, Greensboro, NC
Exit Time:
Permit Expiration
1 100 hrs.
I Date: Aril 26, 2012
Name(s) of On -Site Representative(s): Phone No(s):
Ms. Kelle Beatty 336-547-7126
Name, Address of Responsible Official:
Plant Manager
Phone No.
Contacted? N
Mr. David Clark
2914 Patterson Street
336-547-7183
Greensboro, NC 27407
Section C: Areas Evaluated During Inspection (check only those areas evaluated)
X Permit NA Flow Measurement NA Operations/Maintenance NA Sewer Overflow
X Records/Reports X Self -Monitoring Program NA Sludge Handling/Disposal NA Pollution Prevention
X Facility Site Review NA Compliance Schedules NA Pretreatment
NA Effluent/Receiving Waters NA Laboratory X Stormwater
Section D: Summary of Findings/Comments
See attached letter for further details regarding the subject inspection.
Name(s) and Signature(s) of Inspectors:
AgencylOffice/Telephone:
Date:
DWQ / WSRO / [phone].
e4 S T IR
Signature of Rev' er:
Agency/Office: -
Date:
DWQ / WSRO / [phone]
u

Permit: NCS000077 Owner - Facility: pow Corning Corporation
Inspection Date: 0912112010 Inspection Type: Compliance Evaluation Reason for Visit: Routine
# Has the facility evaluated all illicit (non stormwater) discharges?
Comment:
Page: 4

June 30, 2004
Mr. Bradley Bennett, Supervisor
Stormwater and General Permits Unit
NCDEHNR
1617 Mail Service Center
Raleigh, NC 27600-1617
Dear Mr. Bennett:
In response to your letter of May 3, 2004, we have prepared the attached application for renewal our site
Stormwater Permit (No. NCS000077). The application consists of the following elements:
• A signed Certified Renewal Application Form which lists several corrections for your database.
• A current Site Map showing the location of industrial activities, material transfer and storage
locations, drainage structures, outfall locations and their drainage areas, site buildings, and
impervious surfaces.
• A summary of the Analytical Results for the four quarters of 2003.
• A summary of the Visual Monitoring results from 1999 to 2004.
• A listing of site Best Management Practices.
• A Short Narrative of industrial activities changes at the site
• A signed Certification Form, which states that the site has a comprehensive Stormwater Pollution
Prevention Plan.
We believe that this application is complete. If there are any questions or comments, please contact Ms.
Penny Partido at [phone].
Sincerely,
l
Mr. Larry Tarvestad
Dow Corning Corporation
Greensboro Site Manager
C: Penny Partido
Attachment
Dow Corning Corporation
Greensboro Plant
2914 Patterson St.
Greensboro, NC 27407
Phone: [phone]
Fax: [phone]
www.dowcorning.com

°` warFgo PERMIT COVERAGE
Y RENEWAL APPLICATION FORM Permit Number
National Pollutant Discharge Elimination System NCS000077
Stormwater Discharge Permit
THIS APPLICATION MUST BE SIGNED AND RETURNED ALONG WITH TILE REQUESTED SUPPLEIN'IENTAL
INFORMATION TO THE DIV. OF WATER QUALITY IN ORDER FOR YOUR FACILITY TO QUALIFY FOR
RENEWAL OF YOUR STORMWATER PERMIT NCS000077
The following is the information currently in our database for your facility. Please review this information carefully
and make all corrections as necessary in the space provided to the right of the current information.
OWNER INFORMATION
Owner/Or-. Name: DOW CORNING CORPORATION
Owner Contact:
Mailing Address:
Phone Number:
Fax Number
E-mail address:
FACILITY INFORMATION
Facility Name: DOW CORNING CORPORATION
Facility Contact: Larry E. Tarvestad
Facility Address: 2914 PATTERSON ST
GREENSBORO. NC 27407
Phone Number: 336-547-7202
Fax Number 336-547-7126
E-mail address: 1 arry-tarvestadC-dowcorni ng _crlm_
PERMIT INFORMATION
Permit Contact: JIM WHITLOCK Penny S _ Part.i gin
Mailing Address: 2914 PATTERSON ST
CREENSBORO, NC 27407
Phone Number: 3365477202 '336-547-7129
Fax Number: 236-547-7126
E-mail address:
DISCHARGE INFORMATION
Discharge Receiving Water: UT SOUTH BUFFALO CREEK
Stream Class: C NSW
Basin:
Sub -Basin #: 030602
Number of outfalls:
CERTIFICATION
I certify that I am familiar with the information contained in the application and that to the best of my knowledge and
belief such information is true, complete and accurate.
1;1Signature a Date Q
lcur'Cvice- 6- Iort/c_si-J
Print or type name of person signing above
Please return this completed renewal application form to:
Individual Permit Renewal
Attn:
Stormwater and General Permits Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-16t7
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Copyright (C) 1998, Maptech, Inc.

Markers
Name: Chemol Co., Inc.
Short Name: ChmlCn
Coordinates: 0360 02' 38.32" N, 0790 47' 09.57" W
Comment: Chemol Co, Inc., NCS000048, Cape Fear River Basin, 03-06-02, Mile Run Creek,
Class C NSW
Name: Dow Corning Corporation
Short Name: DwCrnn
Coordinates: 0360 03' 26.53" N, 0790 50' 42.99" W
Comment: Dow Corning Corporation NCS000077, Cape Fear River Basin, 03-06-02, UT to
Brunswick River, Class C NSW, USGS Greensboro

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Analytical Monitoring Results
June 30, 2004
Parameters
1Q2003
2Q2003
3Q2003
4Q2003
Rain Events
Date of Rain
3/13/03
4/05/03
7/02/03
10/28/03
Total rainfall,
inches.
0.50
0.24
0.56
0.27
Event duration,
120
120
120
120
minutes
Total Flow, M
Gallons
13.6
6.5
15.2
7.3
,Analytieal Results
:-011tfall#1
Total Nitrogen,
mg/1
1.75
2.11
2.98
<1.0
Total
Phosphorus,
0.128
0.661
0.596
2.30
m 1
Total
Suspended
34.3
6.0
346
22.5
Solids, mg/1
Outfall`42; -
Total Nitrogen,
mg/l
3.04
1.86
1.30
<1.0
Total
Phosphorus,
0.851
0.625
0.192
0.666
Mg/1
Total
Suspended
90.0
5.33
72.0
22.2
Solids, mg/1

2
16-D
Total Nitrogen,
1.59
1.79
2.35
0.670
mg/l
Total
Phosphorus,
0.104
0,223
0.180
0551
m
Total
Suspended
6.0
20.0
6.0
10.4
Solids, mg/l
Total Nitrogen,
1.97
1.71
1.42
<1.0
mg/1
Total
Phosphorus,
0.545
0.274
<0.050
0.510
mg/l
Total
Suspended
163
18.6
10.2
6.6
Solids, m
Outfall #5'
Total Nitrogen,
4.23
<1.0
<1.0
1.96
mg/l
Total
Phosphorus,
0.709
0.583
0.089
0.211
mg/1
Total
Suspended
1,972
87
401
776
Solids, m 1

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Visual Monitoring Results Summary
June 30, 2004
Outfall Number
Comments
1
2
3
4
5
Color
Good
Good
Good
Good
Good
Odor
None
None
None
None
None
Clarity
Good
Good
Good
Good
Good
FIoating
None
None
None
None
None
Solids
(normal)
(normal)
(normal)
(normal)
(normal)
Leaves fall
Leaves fall
Leaves fall
Leaves fall
Leaves fall
Suspended
Solids
None
None
None
None
None
Form
None
None
None
None
None
Oil Sheen
None
None
None
None
None
Others
None
None
None
None
None

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Best Management Practices
June 30, 2004
Best Management Practices (BMPs)
Best management practices (BMPs) include proper equipment design and operation,
manufacturing and material handling procedures, structural controls and landscaping
practices.
• Spill Containment Structures: Containment structures are constructed of concrete and
concrete block. All containment structures are sized to hold the contents of the
largest tank plus accumulated rainwater. Each containment structure has the
maximum level for rainwater clearly marked such that the structure will still hold the
contents of the largest storage tank
• Drainage from Containment Areas: All containment areas have manually operated
valves or pumps, which remain closed and locked when not in operation. Drain
valves are on/off type - no flapper type valves are used. Accumulated stormwater is
inspected and inspection results are documented before stormwater is released. Only
trained personnel may inspect and release stormwater.
• Storasze Tank Desi n and Installation: All storage tanks are constructed of materials
compatible with material stored and operating pressure and temperature. All storage
tanks have concrete secondary containment structures. All bulk storage tanks have
high level interlocks that will stop material transfer when tripped.
• Material LoadingLUnloadinp,: All bulk material handling is done in spill -contained
areas. Standard Operating Procedures are required for all bulk material handling
operations and checklists are used for each transfer. Only trained personnel are
permitted to load or unload material.
• Preventive maintenance: The Site's preventive maintenance program includes
inspections of bulk storage tanks, loading stations, transfer piping, spill containment
structures, high level alarms, and critical process equipment and instrumentation.
• Inspections: The site's Environment Health and Safety Team conducts weekly
inspections of the facility. Stormwater outfalls are inspected biannually.
• Personnel Training and Instruction: All process operators receive basic
environmental awareness and safety training before beginning specific process
training. A qualified operator must train all process operators before they are allowed

to operate any process alone. Corporate policy requires standard operating
procedures (SOPs) for all process operations.
• Production Areas: All production operations are conducted in enclosed buildings.
Production buildings have concrete floors with no floor drains.
• Particulate Emission Control: All processes handling particulates have dust collectors
to control particulate emissions. All dust collectors are part of the Site's preventive
maintenance program.
• Housekeeping: Housekeeping inspections are conducted monthly by each production
building and quarterly by site management.
Security: All buildings are locked and production and storage areas are completely
fenced.
• Erosion Prevention and Control: Parking areas are concrete and asphalt with the
exception of one small area near building 5_ The remaining ground area is covered
with grass, shrubs and trees. Landscaping and contouring of the site grounds have been
utilized to minimize run-on of stormwater from non-production/storage areas into active
chemical usage and storage areas.

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Site Changes Summary
June 30, 2004
The following facility changes have occurred at the site:
• In 2000, a Mix/Blend operations in Building #5 was shutdown
• In 2003, a Hot Melt Process was started up in Building # 3. This raw material for
this process are in 55-gallon drums and are stored in exiting containment
structures
Neither of these changes have impacted the site stormwater program.

STORMWATER POLLUTION PREVENTION PLAN
DEVELOPMENT AND IMPLEMENTATION
CERTIFICATION
N.C. Division of Water Quality, Stonnwater and General Pei -mils Uitit
Facility Name: DOW CORNING CORPORATION
Permit Number: NCS000077
Location Address: 2914 PATTERSON ST
GREENSBORO, NC 27407
County: GUILFORD
"1 certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all attachments
were developed and implemented under my direction or supervision in accordance with a system designed to assure
that qualified personnel properly gather and evaluate the information required by the SPPP. Based on my inquiry of
the person or persons who manage the system, or those persons directly responsible for gathering the information,
the information gathered is, to the best of my knowledge and belief, true, accurate, and complete"
"I certify that the SPPP has been developed, signed and retained at the facility location and the SPPP has been fully
implemented at the named facility location in accordance with the terms and conditions of the stormwater general
permit."
"I am aware that there are significant penalties for falsifying information, including the possibility of fines and
imprisonment for knowing violations"
Sign (according to permit signatory requirements) and return this Certification. DO NOT SEND TFIE
STORMWATER POLLUTION PREVENTION PLAN WITH THE CERTIFICATION.
Signature �'t/ Date W�Lo
Lat~r,t-o« C T^rvrs4J
Print or type name of person signing above
�/ tG++S �uro SI �+C. M.e.•ti �t
Title
&-+-� 4—f^1 4, /J.
SPPP Certification 2199

Crj 7�
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
December 3, 2004
Larry Tarvestad
Dow Corning Corporation
2914 Patterson St.
Greensboro, NC 27407
Alan W. Klimek, P.E. Director
Division of Water Quality
Subject: NPDES Permit Renewal Application
Permit Number NCS000077
Individual Stormwater Permit
Guilford County
Dear Mr. Tarvestad:
The Division of Water Quality's Stormwater and General Permits Unit hereby acknowledges receipt of your renewal
application for coverage under NPDES Permit Number NCS000077 on July 9, 2004. The submitted renewal package
contained the following items:
➢ Signed application
➢ Site map
➢ Analytical monitoring results summary
➢ Visual monitoring results summary
➢ Best Management Practices summary
➢ Narrative describing significant changes at the permitted facility
➢ Signed Stormwater Pollution Prevention Plan certification
A preliminary review of the submitted renewal application package has been conducted, and it appears to be complete. No
further information is required at this time. If you have any questions about the renewal process or would like to discuss this
letter, please contact me at [phone], extension 537.
Sincerely,
tonathari'A. Diggs
Environmental Engineer
cc: Winston-Salem Regional Office
Stormwater Permitting Unit
Central Files
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617
Internet: h2o.enr.state.nc.us 512 N. Salisbury St. Raleigh, NC 27604
t=
NonhCarolina
Natundy
Phone [phone] Customer Service
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NCS 000077
F 1fJr4]'F Michael F. Easley, Governor
`O9QG William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P. E. Director
Division of Water Quality
Q ^� Coleen H. Sullins, Deputy Director
Division of Water Quality
STAFF REVIEW AND EVALUATION
NPDES Stormwater Permit
Facility Name:
Dow Corning Corporation
NPOES Permit Number:
NCS000077
Facility Location:
Greensboro, NC (Guilford County)
Type of Activity:
Silicone manufacturing and packaging
Receiving Streams:
UT to South Buffalo Creek, See Figure 1
River Basin:
Cape Fear River Basin, Sub -basin 03-06-02
Stream Classification:
C, NSW
Proposed Permit Requirements:
See attached draft permit.
Monitoring Data:
See Tables 1, 2, and 3
Facility Location:
See Figure l -__ _
Response Requested by (Date):
Central Office Staff Contact:
Kelly Johnson, [phone], ext. 376
Documents Reviewed:
• NPDES Stormwater Permit Application Materials
• Stormwater Permit File
• Analytical and Qualitative Monitoring on file with the Division
• Cape Fear Basinwide Plan, 2005
• Draft 2006 303(d) List, 2006
s EPA Sector -Specific Permit, 2006 draft
Previous Permits and Activities:
• August 31, 1994: Letter containing a permit effective October 1, 1994 until August 31, 1999.
• December 10, 1999: Letter containing a permit effective January 1, 2000 until December 31, 2004.
• July 9, 2004: Division received the permit application.
• December 3, 2004: Division acknowledged receipt of the permit application.
I DM
N. C. Division of Water Quality 1617 Mail Service Center Raleigh, North Carolina 27699-1617 [phone] Customer Service
1-877-623-6748

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N

•.
NCS000077
Sampling Data:
Tables 1, 2, and 3 below summarize the data on file from the applicant. All values provided are represented to
the number of significant figures in the file.
Table l: Summary of Analvtical Monitoring Data, Rainfall Information
Required
Sampling
Ran a
Date
Total iEvent
Rainfall
in
Duration
min
Total Flow
(Mgal)
Q1, 2003
13-Mar-03
0.50
120
13.6
Q2, 2003
1 5-Apr-031
0.24
120
6.5
Q3, 2003
1 2-Jul-03
0.561
1201
15.2
Q4, 2003
1 28-Oct-031
0.271
1201
7.3
Table 2: Summary of Analytical Monitoring Data, Analytical Information
TN
m IL
TP
m /L
TSS
m IL
Benchmark:
30 (mglL)
Benchmark:
2 (mg/L)
Benchmark:
100 (mg/1)
Required
Sampling
Ranne
Date
Outfall #1
Q1, 2003
13-Mar-0
1.75
0.128
34.
Q2, 2003
5-Apr-03
2.11
0,661
6
Q3; 2003
2-Jul-0
---2:98
------0.596
j6
Q4, 2003
28-Oct-0
<1.0
�MT3
22.5
Required
Sampling
Ranae
Date
Outfal1 #2
Q1, 2003
13-Mar-0
3.04
0.8511
90
Q2, 2003
5-Apr-031
1.86
0.6251
5.33
Q3 2003
2-Jul-0
1.30 0.19 , ' 72.0
<1.0 0.66E 22.2
Outfall #3
Q4, 2003
28-Oct-0
Required
Sampling
Ral3ge
Date
Q1, 2003
13-Mar-0
1.59
0.104
6.0
Q2 2003
5-Apr-0
1.79
0.223
20.0
Q3, 2003
2-Jul-0
2.35
0.180
6.0
Q4, 2003
28-Oct-0
0.670
0.551
10.
Required i
Sampling
e
Date
Outfall #4
003
13-Mar-O
1.97
0.545
163
003
L
5-A r-0
1.71
0.274
18.6
003
2-Jul-O
1.42
<0.050
10.2
003
28-Oct-0
<1.0
0.510
6.6
Required
Sampling
Ranae
Date
Outfall #5
Q1, 2003
13-Mar-0
4:23
0.709
�1F97i2
Q2, 2003
5-A r-0
<1.0
0.583
87
Q3 2003
2-Jul-0
<1.0
0.089
�WVI1
Q4, 2003
28-Oct-0
1.96
0.211
77 .

NCS000077
Color
Odor
Clarity
Floating Solids
Suspended Solids
Foam
Oil Sheen
Other
Central Office Review Summary:
Table 3: Qualitative Monitoring
1 2 3 4 5
Good
Good
Good
Good
Good
None
None
None
None
None
Good
Good
Good
Good
Good
None, just
leaves
None, just
leaves
None, just
leaves
None, just
leaves
None, just
leaves
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
1. General Observations: This facility drains to NSW waters, and has consistently been under the benchmark
for nitrogen. Of the four samples for each of five outfalls, only one phosphorus sample was over the
benchmark, and not excessively above it. The permittee has had consistent TSS exceedances at outfall
number five. This may be due to the Iayout of the facility.
The site map shows that outfall number one is at the northern most part of the facility. This side of the
property borders an asphalt company. Outfall number one had one TSS exceedance. OutfaIl number one
drains to the collection point of outfall number two, which drains to number three, then to number four,
and then to number five. It is likely that outfall number five has high TSS readings because it is the final
collection point.- It is likely that solids from the asphalt company. flow onto the permittee's site. --The =-- ---
reviewer recommends that the permittee control offsite TSS as much as possible while also working to
control any onsite TSS.
2. Impairment: irment: This facility drains to an unnamed creek of South Buffalo Creek. The 303(d) list divides
Stream Index Number 16-11-14-2 into three parts; a, b, and c. This facility drains to "a", which is
classified as from the source of the creek to McConnell Road. This 15.4-mile section was impaired in 1998
for biological integrity, and in 2006 for turbidity standard violation. Both the 303(d) list and the Basinwide
Plan cite MS4 NPDES as the source for this stress on the creek.
3. Significant Facility Changes Since Previous Permit: A Mix and blend operation within building number
five was shut down in 2000. In 2003, a hot melt process was started up in building number three. The raw
materials used in this process have containment structures. The applicant says that neither change has
impacted the site stormwater program.
Qualitative Monitoring:
The qualitative monitoring for this facility does not highlight any problems.
Analytical Monitoring:
l . Benchmarks have been added to this draft permit.
2. All analytical monitoring has been changed to semi-annual.
3. The flow reporting requirement has been removed per DWQ revised strategy. (The total rainfall and event
duration parameters have been retained.)
4. The permittee is required to collect all of the analytical monitoring samples during representative storm
events as defined in this permit. This is not a change from their previous permit. Qualitative monitoring
does not have to be performed during a representative storm event.

NCS000077
Other Proposed Changes to the Previous Permit:
1. Part II Section A has been revised. It now specifies all of the items to include on the site map. The
permittee is required to submit a revised map to the Division. This is due one year after the effective date
of the permit.
Recommendations: Based on the documents reviewed, the application submitted on July 9, 2004 is sufficient to
issue an Individual Stormwater Permit.
Prepared by (Signature) Date0 �j ll.
b QIft vu t •
Stormwater Permitting Unit Supervisor QA ate
Concurrence by Regional Office�LM?AL. Date
Water Quality Supervisor
Date

NCS000077
Subject: NCS000077
From: Corey Basinger <Corey. Bas i nger@nc mail. net>
Date: Mon, 26 Feb 2007 14:15:21 -0500
To: Kelly P Johnson <[e-mail]>
Kelly,
I've reviewed the draft permit for Dow Corning NCS000077. I have only one suggested addition. Be
sure to add the stream name prior to the stream classification on the cover page of the new permit. The
stream name is Unnamed tributary to S. Buffalo Creek.
Otherwise, ok to reissue.
Corey
Corey Basinger
[e-mail]
NC DENR Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
[phone]
Fax [phone]
Corey Basinger <Corey.Basinger a,NCmail.net>
W SRO
NC DENR
l of 1 2/26/2007 2:32 PM

North Carolina NIiP Info System
http://nl7pitiap.enr.state.nc.us/gtnap75_main.phttnl"grp_eo_p�,=Y&L,rp_eosre pt=1'K4rp_eo...
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2007-Feb-08
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I of 1 2/8/2007 9:25 AM

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Element Occurrence(s)
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Select Gid
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Common Name
Last
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Name
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Date
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r 8011
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22
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1990-02-1i
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1992-03-18
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1993-04-29
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1993-06-16
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1993-06-24
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r 20046
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1990-PRE
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r 13686
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1958-04-30
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Rank Rank Accuracy
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19043
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S2 G3 j Very Low
S2 G3 Low
S3B,S3N G4 Very Low
S2 G3G4 Very Low,
16196
6197
15168
6341
18485
I of I
2/8/2007 9:25 AM

VYA7-1
Michael F. Easley, Governor
p
G
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
7
OAlan
W. Klimek, P.E., Director
Division of Water Quality
May 2, 2007
Ms. Kelle Beatty
Environmental Engineer
Dow Corning, Greensboro Plant
2914 Patterson Street
Greensboro, North Carolina 27407
Subject: Final NPDES Stormwater Permit
Permit NCS000077
Dow Coming
Guilford County
Dear Ms. Beatty:
This letter is in response to our telephone discussion this morning and will serve to correct an error
on the April 27, 2007 cover letter to your newly issued individual permit. The previous letter stated
that Outfall 001 was representative of Outfall 002, which was incorrect. You have been granted
representative outfall status to sample Outfall 002 as representative of Outfall 001. Outfails 003, 004,
and 005 must continue to be sampled. Thank you for bringing this error to our attention. '
If you have any questions or comments concerning this change, contact Kelly Johnson at [phone] x
376 or Kelly.p.Johnson®ncmail.net.
Sincerely,
VellyVJson
Environmental Engineer
cc: Winston-Salem Regional Office, Corey Basinger
Stormwater Permitting Unit
Central Files
enc: Stormwater Permit, NCS 000077
North Carolina Division of Water Quality [phone]
1617 Mail Service Center FAX [phone]
Raleigh, North Carolina 27699-1617 On the Internet at http://h2o.enr.state.nc.us/

NCS000077 Dow Corning
Subject: Re: NCS000077 Dow Corning
From: Corey Basinger <[e-mail]>
Date: Tue, 24 Apr 2007 14:21:33 -0400
To: Kelly Johnson <[e-mail]>
002 is representative of 001 and 002. There are other drainages involved in 003, 004 and 005. They will
remain as outfalls. 001 is the only outfall to be removed.
CB
Corey Basinger
[e-mail]
NC DENR Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
[phone]
Fax [phone]
On 4/24/2007 1:14 PM, Kelly Johnson wrote:
Corey,
Is 002 representative of 003, 004, and/or 005 as well or just for 001? They appear to all drain
together but you would certainly know better having been there.
Thanks,
Kelly
Corey Basinger wrote:
Kelly,
1 visited Dow Corning (NCS000077 Guilford County) today. They have requested
representative outfall status in a letter addressed to you dated March 29, 2007. I reviewed this
request during my site visit and recommend approval as follows: Outfall 002 is representative of
Outfall 001 and Outfall 002, therefore Outfall 001 should require no further monitoring. Should
you have any questions or comments, please contact me. Please cc: the WSRO on any
correspondence relating to the approval of this representative outfall status request.
Thanks!
Corey
Corey Basinger <Corey. B asi nger(a-),NC mail. net>
WSRO
NC DENR
1 of 1 4/24/2007 2:21 PM

March 29, 2007
Ms. Kelly Johnson
Environmental Engineer
North Carolina Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Ms. Johnson:
In response to your draft Stormwater Permit (No. NCS000077) letter dated February 27,
2007 Dow Coming Corporation would like to request representative outfall status for
outfall 001.
If there are any questions or comments, please contact me at [phone].
Sincerely,
Kelle Beatty
Dow Corning Corporation
Environmental Engineer
Dow Corning Corporation
Greensboro Plant
2914 Patterson 5t.
Greensboro, NC 27407
Phone: [phone]
Fax: [phone]
APR r 4 )on;
o�rv� rtn
"e anos 8 s�, jmy QUI 8r
www.dowcorning.com

o�0F w R rEq
r
Mr- Larry Tarvestad
Greensboro Site Manager
Dow Corning Corporation
2914 Patterson St
Greensboro, NC 27407
Dear Mr. Tarvestad:
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan`W. Kltmek.,_:£—„Bisector
Divisionof.l4at,e i�ualtty
. . pact. eN�
February 27, 2007 FEB 2 8 2007
Winston-�alerr
Regional p��p
Subject: Draft Permit, NCS 000077
Dow Corning Corporation
Guilford County
In response to your application received July 9, 2004 I have enclosed a draft stormwater permit for your facility.
Please review the draft very carefully to ensure thorough understanding of the conditions and requirements it
contains.
The draft permit contains the following significant changes from this facility's current permit:
• Benchmarks for analytical monitoring have been added to this draft permit.
• All analytical monitoring has been changed to semi-annual.
• The flow reporting requirement has been removed per DWQ revised strategy. The total rainfall and event
duration parameters have been retained.
• You are required to collect all of the analytical monitoring samples during representative storm events as
defined in this permit. Qualitative monitoring does not have to be performed during a representative
storm event.
Please submit any comments to this draft in writing no later than thirty (30) days following your receipt of this
letter. Comments should be sent to the address listed at the bottom of this page. If no adverse comments are
received from the public or from you, this permit will be issued in approximately two months.
If you have any questions or comments concerning this draft permit, contact me at [phone] x 376 or
[e-mail].
Sin perely,
Kelly o nson
Environmental Engineer
enc: Draft Permit
cc: Winston Salem Regional Office, Corey Basinger
Central Files
Stormwater Permitting Unit File
Nor` Carolina
�t`urally
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: h2o.enr.state.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/Affirmative Action Employer - 50% Recycledil0% Post Consumer Paper

CAPE FEAR River Basin
Subbasin 03-06-01
Assessment
Impaired
Year
Waterbody and Description Unit (AU} Class
Subbasin
Use
Listed Category and Reason for Listing
Potential Source(s)
(Niles or Acres
Little Troublesome Creek 16-7a C NSW
03-06-01
6
3.5 FW Miles
From source to Reidsville WWTP
AL
2000
6
Impaired biological integrity
Impervious Surface
Little Troublesome Creek ' 16-7b C NSW
03-06-01
6
5.1 FW Miles
From Reidsville WWTP to Haw River
REC
1998
4a
Standard violation: Fecal Coliform
Agriculture
AL
1998
6
Impaired biological integrity
Impervious Surface
Road Construction
MS4 NPDES
Troublesome Creek 16-6-(3) C NSW
03-06-01
5
1.8 FW Miles
From dam a1 Lake Reidsville to Haw River
AL
2006
5
Standard violation: Low Dissolved
Unknown
Oxygen
Impoundment
CAPE FEAR River Basin
Subbasin 03-06-02
Brush Creek 16-11-4-(1]a1 WS-111
03-06-02
6
2.4 FW Miles
NSW
From source to UT at SR 2085
AL
1998
6
Impaired biological integrity
Brush Creek 16-11-4-(1)a3 WS-111
03-06-02
6
1.6 FW Miles
NSW
From UT 0.3. miles downstream of SR 3820 to a point 0.5 mile downstream of
AL
1998
6
Impaired biological integrity
MS4 NPDES
Guilford County SR 2190
,
HAW RIVER 16-(1)d2 C NSW
03-06-02
6
10.1 FW Miles
From Subbasin 01IO2 boundary to Service Creek
O
1998
6
Impaired biological integrity
MS4 NPDES
O
1998
4a
Standard violation: Fecal Coliform
Impervious Surface
Agriculture
DRAFT for PUBLIC REVIEW North Carolina 303(d) List- 2006 Tuesday, January 31, 2006
CAPE FEAR Basin 03-06-02 Page 2 of 126

CAPE FEAR River Basin Subbasin 03-06-02
Assessment Impaired Year
Waterbody and Description . Unit (AU) Class Subbasin USe Listed Category and Reason for Listing Potential Source(s) Miles or Acres
Horsepen Creek 16-11-5-(0.5)a WS-III 03-06-02 6 1.8 FW Miles
NSW
From source 10 Ballinger Road AL 2000 6 Impaired biological integrity MS4 NPOES
Horsepen Creek 16-11-5-(0.5)b WS-III 03-06-02 6� 3.2 FW Miles
NSW
From Ballinger Road to U.S. Hwy 220 AL 2000 6 Impaired biological integrity MS4 NPDES
Unknown
Horsepen Creek 16-11-5-(2)
WS-III
NSW CA
03-06-02�
6
1.8 FW Miles
From U.S. Hwy 220 to Lake Brandt, Reedy Fork
AL
2000
6
Impaired biological integrity
MS4 NPDES
Unknown
North Buffalo Creek 16-11-14-1al
C NSW
03-06-02
6
7.5 FW Miles
From source to Philadelphia Lake
AL
REC
2000
1998
6
4a
Impaired biological integrity
Standard violation: Fecal Coliform
Unknown
North Buffalo Creek 16-11-14-ia2
C NSW
03-06-02
6
1.6 FW! Miles
From Philadelphia Lake to North Buffalo Creek VVKFP
AL
REC
2000
1998
6
4a
Impaired biological integrity
Standard violation: Fecal Coliform
MS4 NPDES
North Buffalo Creek 16-11-14-1b
C NSW
03-06-02
6
8.1 FW Miles
From North Buffalo Creek WWfP to Buffalo Creek
AL
O
2000
2000
6
4b
Impaired biological integrity
Historical listing decision: Ammonia
MS4 NPDES
Reedy Creek 16-11-(1)b
WS-111
NSW
03-06-02
6
4.2 FW Miles
From SR 2128 to a point 0A mile downstream of Moores Creek
AL
2006
6
Impaired biological integrity
Impervious Surface
DRAFT for PUBLIC REVIEW North Carolina 303(d) List 2006 Tuesday, January 31, 2006
CAPE FEAR Basin 03-06-02 Page 3 of 126

CAPE FEAR River Basin
Subbasin 03-06-02
Assessment
Impaired
Year
Waterbody and Description Unit (A U)
Class
Subbasin
Use
Listed Category and Reason for Listing
Potential Source(s)
Miles or Acres
Reedy Fork (Hardys Mill 16-11-(9)82
C NSW
03-06-02
6
2.2 FW Mites
Pond)
From UT at SR 2782 to UT at SR 2778
AL
2006
6
Impaired biological integrity
Reedy Fork (Hardys MITI 16-11-(9)b
C NSW
03-06-02
5
8.6 FW Miles
Pond)
From Buffalo Creek to Haw River
O
2000
6
Impaired biological integrity
Unknown
REC.
2006
5
Standard violation: Fecal Coliform
Ryan Creek 16-11-14-2-3
C NSW
03-06-02
5
4.2 FW Miles
tr
From source to South Buffalo Creek
AL
2006
5
Standard violation: Turbidity
MS4 NPDES
r�
South•Buffalo•Creek _76 11=742a7
`From
C NSW
03-06-02
5
15.4 FW Miles
source to McConnell Rd
AL
1998
6
tmpaired•tbiological:integrity
MS4 NPDES
AL
2006
5
Standard violation:_TurbidityD
�X
South Buffalo Creek 16-11-14-2b
C NSW
03-06-02
6
4.7 FW Wiles
From McConnell Rd to US 70
AL
1998
6
Impaired biological integrity
MS4 NPt7ES
South Buffalo Creek 16-11-14-2c C NSW 03-06-02
5
' 4.8 FW Miles
From US 70 to Buffalo Creek
AL
2006
5
Standard violation: Turbidity MS4 NPDES
O
2000
4b
Historical listing decision: Ammonia
AL
2000
6
Impaired biological integrity
Unnamed Tributary at 16-11-5-1-(2) WS-III 03-06-02
6
1.3 FW Miles
Guilford College NSW
From dam at Guilford College bathing lake to Horsepen Creek
AL
2006
6
impaired biological integrity
Varnals Creek 16-21a C NSW 03-06-02 6 4.6 FW Miles
From source to Rock Creek
AL 2006 6 Impaired biological integrity
DRAFT for PUBLIC REVIEW North Carolina 303(d) List- 2006 Tuesday, January 31, 2006
CAPE FEAR Basin 03-06-02 Page 4 of 126

CAPE FEAR River Basin Subbasin 03-06-03
Assessment Impaired Year
Waterbody and Description Unit (A0 Class Subbasin Use Listed Category and Reason for Listing Potential Source(s) Mites or Acres
CAPE FEAR River Basin Subbasin 03-06-03
Big Alamance Creek 16-19-(4.5)a C NSW 03-06-03 6 5.6 FW Miles
(Alamance Cr)(Lk Macintosh(
From Dam at Lake Macintosh to confluence with Stinking Quarter Creek AL 2006 6 Impaired biological integrity MS4 NPDES
Agriculture
Little Alamance Creek (Gant 16-19-11 C NSW 03-06-03 6 12.6 FW Miles
Lake, Mays Lake)(Alamance
County
From source to Sig Alamance Creek AL 2000 6 Impaired biological integrity M34 NPDES
CAPE FEAR River Basin Subbasin 03-06-04
Collins Creek 16-30-(1.5) WS-IV 03-06-04 6 3.7 FW Miles
NSW
From a point 0.8 miles downstream of Orange County SR 1005 to Haw River AL 2006 6 Impaired biological integrity Agriculture
Dry Creek 16-34-10.7j WS-IV 03-06-04 6 10.1 FW Miles
NSW
From a point 0.3 miles downstream of Chatham County SR 1506 to Haw River AL 2006 6 Impaired biological integrity Land Clearing
Unknown
HAW RIVER 16-(37.3) WS-IV 03-06-04 5 53.2 FW Acres
NSW CA
From a point 0.5 mile downstream of US Hwy 64 to approximately 1.0 mile below US AL 2006 5 Standard violation: Chlorophyll a MS4 NPDES
Hwy 64 AL 2006 5 Standard violation: High pH Impervious Surface
Agriculture
" TP NPDES
WWTP NPDES
DRAFT for PUBLIC REVIEW North Carolina 303(d) List- 2006 Tuesday, January 31,'2006
CAPE FEAR Basin 03-06-04 Page 5 of 126

Table 5 CAPE FEAR Subbasin 03-06-02
AU Number Classification
Length/Area Aquatic Life Assessment
Recreation Assessment
Year/
Description
AL Rating Station Result Parameter % Exe
REC Rating Station Result
Stressors Sources
iSouthlBtifN15 Creeic�`
CI gill 14-2 C,'NSW
lS.4=FWEMi1esI--'I— A50—NCE Turbidity--.7.-3
N_R' BA50—NCE
Habitat Degradation---.MS4•NPDES
rBA752-CE�Turbidity�]"4a
BA752—NCEJ
Feca! Gnliform.8a`cte`ria'MS4 NP!]ES)
cBA756—NCF-
(Turbid ity MS4•NPD>rS7
From source to McConnell Rd
88406—P-7003=
16-11-14-2b C NSW 4.7 FW Miles I ND Habitat Degradation MS4 NPDES
From McConnell Rd to US 70 BF73 P 2003
16-1 1-14-2c C NSW 4.8 FW Miles I BA54 CE Turbidity 10.5 ND BA54 NCE Turbidity MS4 NPDES
From US 70 to Buffalo Creek
Stony Crock .Burlin'gt n)
M-14-(I)a Ws -II HQW 4.3 FW Miles S NO Habitat Degradation
From source to Benton Branch BF26 GF '2003
16-14-(1)b Ws -II HQW 2.7 FW Miles S NO Habitat Degradation
From Benton Branch to backwaters of Lake Burlington 13B231 GF 2003
16-14-(1)c Ws -II 1IQW 738.0 FW Acres NR
13L5
NCI:' Chlora 33 ND Chlorophyll a Agriculture
Lake Burlington
Stony Cr_ee_k,(Stony,Greek ,Reservo�r)
w '
16-14-(5.5) WS-11 HQ 118.0 FW Acres S
BL6
NCE ND
From Buttermilk Creek to dam at Stony Creek Reservoir
Town Branch
16-17 C NSW 4.2 FW Miles S
BA78
NCE I BA78 NCE Fecal Coliform Bacteria MS4 NPDES
BA78 Cl:
From source to Haw River
n' named Tributary at Guilford College .:
16-11-5-1-(2) WS-111 NS 1.3 FW Miles I
N[3
From dam at Guilford College bathing lake to llorsepen
BB68
P 2001
Creek
CAPE FEAR Suhhosin 03.06-02
,51DOS

aims c)-
DO
September 19, 2016
Division of Stormwater
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Delegation of Signature Authority
Dow Corning Greensboro Site
NPI)ES Number NCS000077
To Whom It May Concern:
Recently, Darren Canimin has replaced Jake Fitzgerald as Site Manager of the Dow Corning — Greensboro
Facility. By notice of this letter, I hereby delegate signatory authority to Darren Carnrnin for all permit
applications, discharge monitoring reports, and other information relating to the operations at the subject facility
as required by all applicable federal, state, and local environmental agencies specifically with the requirements
for signatory authority as specified in 15A NCAC 213.0506.
Contact Information
Mr. Darren Cammin
2914 Patterson Street
Greensboro, North Carolina 27407
date [e-mail]
Office Phone [phone]
Mobile Phone [phone]
If you have any questions regarding this letter, please feel free to contact me at [phone].
Sincerely,
Darren Canrntin
Greensboro Site Manager
2914 Patterson Street, Greensboro, NC 27406
[e-mail]
Office Phone [phone]; Mobile Phone [phone]
cc: NC DWR Winston-Salem Regional Office, Water Quality Permitting Section

5
z
o 1 1 1 1 1 1_ 1_
NO I DRWN I DATE IRVSN. I CHKD I DATE I APPVD I DATE
TANK FARM
T1 - 190 FLUID (2,400 GALLON)
T2 -1400 ANTIFOAM (1,000 GALLON)
T3 - 1400 ANTIFOAM (1,000 GALLON)
T4 - 190 FLUID (5,500 GALLON)
T5A - 1400 ANTIFOAM (5,000 GALLON)
T513 - 1400 ANTIFOAM (5,000 GALLON)
T6 - 200 FLUID/1000 CS (6,000 GALLON)
T7 - 200 FLUID/1000 CS (6,000 GALLON)
T8A -- CS FLUID (5,000 GALLON)
T8B - 200 FLUID/350 CS (5,000 GALLON)
.. fir' '4:)
r .... 18' RCP g`y'1
DS
ASPHALT I1 �tig 6y
Yrlb
is r
i?
f'
i
EX. D. I.#
I ll��ti.
o
WOODS 6.000 GALLON
TANKS ASPHALT l�
I CONCRMI
EX. D. I.
OUTFALL 006 c ��
fi 0 Z .a5.
)Fc
8,000 GALLON
TANK , I U �� ~
i Ozz 8,00
. CONCRETE
FUTURE
8,000 GALLON
TANK $ 1Q ZZ
EX. 36* RC
.20
EX. 18' RCP
+,..+...
INV. 825.37 , .." ... �y1�,.. �" 'o�' r ^
`"..,....., ---INTAKE
-_.•,. ..usu fr � . 0`1'k./`", � $�'1 ti1y� '3° •DS
---------T- T-rE—X. STORM M.H.
a 1 / RIM: 819.20
INV. 6290
OUTFALL 005
COMBINED DISCHARGE FROM
ALL SITE OUTFALLS
A j
ASPHALT.
STORAGE PU;LAING
ti
NOTES:
1. BASE MAP FROM DAVIS-MARTIN-POWELL ASSOCIATES, INC.,
HIGHPOINT, NORTH CAROLINA JOB S-31989, SEPTEMBER, 1991.
2. MAP BENCH MARK IS A DISK STAMPED V 182 SET IN TOP OF
THE WEST END OF THE SOUTHWEST CONCRETE WINGWALL
OF A RAILROAD OVERPASS FOR HOLDEN ROAD, ELEV.=871.49'.
DOW CORNING CORPORATION
PROJECT NO. 104-0011
CURRENT DATE 07/25/1 1 1 CADD FILE SITE PLAN 8-1 0-1 1
Z
J
40' 0 40' 80,
mmmomw
SCALE
SITE DRAINAGE MAP
STORM WATER DISCHARGE PERMIT RENEWAL
DOW CORNING CORPORATION
GREENSBORO, GUILFORD COUNTY, NORTH CAROLINA
DRAWING NO. SCALE IAS NOTED
w
REVISION 1 0

Mickey, Mike
From: Lowther, Brian
Sent: Wednesday, June 06, 2012 2:38 PM
To: Patterson, Robert; Georgoulias, Bethany; Pickle, Ken; Mickey, Mike
Cc: Bennett, Bradley
Subject: RE: Dow Corning Renewal - NCS000077
I don't either. I bet Bradley still has it.
From: Patterson, Robert
Sent: Wednesday, June 06, 2012 2:37 PM
To: Georgoulias, Bethany; Pickle, Ken; Mickey, Mike
Cc: Bennett, Bradley; Lowther, Brian
Subject: RE: Dow Corning Renewal - NCS000077
Me neither. -
From: Georgoulias, Bethany
Sent: Wednesday, June 06, 2012 2:36 PM
To: Pickle, Ken; Mickey, Mike
Cc: Bennett, Bradley; Patterson, Robert; Lowther, Brian
Subject: RE: Dow Corning Renewal - NCS000077
I do not have it. -Bg
Bethany Georgoulias
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Fax: [phone]
NEW Website: http://Portal.ncdenr.org/webtwatws/su
E-mail correspondence to and from this address may be subject to the North Carolina Public
Records Law and may be disclosed to third parties.
From: Pickle, Ken
Sent: Wednesday, June 06, 2012 2:27 PM
To: Mickey, Mike
Cc: Bennett, Bradley; Georgoulias, Bethany; Patterson, Robert; Lowther, Brian
Subject: RE: Dow Corning Renewal - NCS000077
Hi Mike,
OK, I checked BIMS, and Jen is still shown as our reviewer. So, I'm not sure who has picked that up.
Let's ask the group: Is anyone working on the Dow Corning renewal?
Ken Pickle
Environmental Engineer
NCDENR 1 DWQ i Stormwater Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604

Phone: [phone]
Fax: [phone]
Email: ken. [e-mail]
Website: http://portal.ncdenr.org/web/wq/ws/su
** Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulations.**
From: Mickey, Mike
Sent: Wednesday, June 06, 2012 2:09 PM
To: Pickle, Ken
Subject: Dow Corning Renewal - NCS000077
Ken — I understand Jennifer Jones is no longer with the Stormwater Permitting Unit. Previously, she requested
comments for Dow's renewal.
Any idea who I need to forward our comments to now?
Thanks, Mike.
Mike Mickey
Mike. [e-mail]�
NC Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
Phone: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the North
Carolina Public Records Law and may be disclosed to third parties.

NCDENR
North Carolina Department of Environment and Natura
Division of Water Quality
Beverly Eaves Perdue Charles WakildRE
Governor Director
June 8, 2012
MEMORANDUM
TO: LBradley-Bennett,. Supervisor
Stormwater Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
FROM: Michael M. Mickey / WSRO
SUBJECT: Dow Corning Renewal Comments
Permit No. NCS000077
Guilford County
Resources
Dee Freeman
Secretary
The following comments are in response to questions posed by Jennifer Jones in her Staff Review and Evaluation:
1) Representative Outfall Status?: Due to construction changes at the facility the representative outfall status
granted in the Divisions May 2, 2007 letter is no longer applicable (sampling outfall #2 as representative of
outfall #1). Dow Corning has resumed sampling at outfall #1.
2) Require sampling for BOD and COD?: Dow Corning was inspected on 6/6/12 (see letter attached). The
facility appeared to be clean and well managed. However, there are large quantities of chemicals in
tankers, totes/drums and above ground tanks that drain to outfalls 45 and #6. For that reason, sampling for
COD may be appropriate.
3) Sample results for 2007-2010 and 2012?: During the inspection analytical results could only be produced
for 2011. According to Dow personnel, sample collection from 2008 through 2010 was difficult to low
storm flow conditions (WSRO's 9/24/10 inspection letter also mentioned this). For 2012, sampling just
occurred on May 30, 2012 and the results were not available from the laboratory yet. Qualitative
monitoring was performed for years 2008-2012.
Other notes:
The September 21, 2011 analytical sampling event revealed benchmark exceedences for TSS at outfalls 2, 5, and 6
and pH at outfalls 5 and 6. A re -sampling of outfalls 2, 5, and 6 on October 19, 2011 showed all parameters to be
below benchmark values. The company attributed the TSS and pH benchmark exceedences to major construction
around building #2. Aerial photos on the Guilford County GIS web site confirm the construction.
The facility has six outfalls. After discussion during the inspection it was decided that outfall #2 should be
relocated closer to the property boundary. Attached are updated pdf's showing the outfall locations.
Please let me know if you have any further questions
North Carolina Division of Water Quality, Winston-Salem Regional Office
Location: 585 Waughtown St. Winston-Salem, North Carolina 27107
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
Internet www,ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Empioyer
D
JUN 1 1 2012
DENR - WATgR QUALIiy
Wa@Rn4 a --- -
NorthCarolina
,IatumAy

MCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, PE Dee Freeman
Governor Director Secretary
June 8, 2012
Ms. Pamela Berry, Greensboro Site Manager
Dow Corning Corporation
2914 Patterson Street
Greensboro, NC 27407
Subject: General Stormwater Permit Inspection
Dow Corning Corporation
Stormwater Permit No. NCS000077
Guilford County
Dear Ms. Berry:
On June 6, 2012, Mike Mickey of this office met with Ronica Edgerton and Phil Rumley to perform
a NPDES Stormwater Permit Inspection at the Dow Corning operation located on Patterson Street in
Greensboro. The inspection found the facility to be compliant with the stormwater permit. This inspection
evaluated the five (5) areas as designated on the attached inspection form. Observations from each area
are addressed below:
1. Permit
Dow Corning holds NPDES Stormwater Permit No. NCS000077 for the discharge of stormwater from the
facility. The permit expired on April 26, 2012. Dow Corning has submitted the necessary renewal
application and the Division is currently processing the renewal request. A draft copy of the permit
should be forwarded to you sometime in the future.
2. Records/Reports
Part II, Section A of the permit requires the development of a Stormwater Pollution Prevention Plan
(SPPP). A copy of the SPPP was available for review during the inspection. This plan was found to be
thorough and complete. The plan was last updated on October 4, 2011 and documented all of the
components specified by the permit (training, spill plan, secondary containment, site map, etc.).
3. Facility Site Review
A tour of the property found the site to be clean and well managed. Observations did not reveal any
problems or concerns. The release valves for the secondary containment structures were properly locked.
The release of accumulated stormwater from the structures was properly documented and recorded per
Item 2(b) of Fart II, Section A of the permit.
Previously, by letter dated May 2, 2007, the Division granted representative outfall status for outfall #2 to
be sampled as representative of outfall 41. It is our understanding that this representative outfall status is
no longer applicable due to construction changes at the facility and that sampling is now resumed for
outfall # 1.
North Carolina Division of Water Quality, Winston-Salem Regional Office
Location: 585 Waughtown St. Winston-Salem, North Carolina 27107 One
Phone: [phone] FAX: [phone]C 1 Customer Service: 1-877-623-6748 North Carolina
Internet www.ncwaterquality.org '�'�/atmal/y
An Equal Opportunity IAffinnatveAction Employer

Ms. Pamela Berry
Page 2
June 8, 2012
4. Effluent/Receiving Waters
Stormwater from the site is currently monitored at six outfalls that discharge into an unnamed tributary to
South Buffalo Creek, class "WS-V; NSW" waters in the Cape Fear River Basin. Please note that per our
subsequent email conversations, outfall 42 cannot be eliminated since it does not actually combine with
outfall 43 until out in the street. It is our understanding that outfall 42 will be relocated closer to Patterson
Street to capture more stormwater drainage. This will require that the SPPP and site reap be revised.
5. Monitoring Program
Part II, Section B of the permit requires the collection of semi-annual analytical samples of the stormwater
discharge during a representative storm event. A review of the facility files found analytical data for
sampling events that occurred on May 12, 2011 and September 21, 2011. The September sampling
revealed benchmark exceedences for TSS at outfalls 2, 5, and 6 and pH benchmark exceedences at outfalls
5 and 6. A resampling of outfalls 2, 5, and 6 on October 19, 2011 showed all parameters to be below the
benchmark values. The first semi-annual sample for 2012 was recently collected on May 30, 2012. This
data is not yet available from the laboratory. Please note that the results from analytical monitoring
should be reported to the Division of Water Quality within 30 days of receiving the results from your
certified laboratory.
Part H, Section C of the permit requires that qualitative (visual) monitoring be performed and documented
semi-annually at the same time that the analytical monitoring is performed. The file review showed that
this monitoring had been performed with the last two semi-annual events occurring on October 11, 2011,
and May 30, 2012. The qualitative records do not need to be submitted to the Division, however, the
records must be kept on file at the facility for a period of five years.
The analytical monitoring for on -site vehicle maintenance referenced in Part II, Section D of the permit is
not required since the facility uses less than 55 gallons of new motor oil when averaged over the calendar
year.
In summary, Dow Corning is in compliance with the stormwater permit. Please make sure that the
SPPP is updated to indicate the new location of outfall 42.
Should you have any questions concerning this letter, please contact Mike Mickey or me at (336)
771-5000,
Sincerely,
W. Corey Basinger
Water Quality Regional Supervisor
Surface Water Protection Section
cc: Peter Schneider (Water Quality Supervisor, City of Greensboro, Stormwater Management Division, P.O. Sox 3136, Greensboro, NC 27406)
WBSCP Unit
Central Files — SWP
WSRO

Form Approved
OMB No.2040-0057
Approval Expires
8-31-98
NA^°s
t
United States Environmental Protection Agency, Washington, D.C. 20460
Section A: National Data System Coding
Transaction Code NPDES No.
Yr/Mo/Day Inspection Type Inspector FacilityType
N 5 NCS000077
12-06-06 C
S 1
Facility Evaluation Rating
BI QA
..........Reserved...........
I
N N
Section B: Facility Data
Name and Location of Facility Inspected:
Entry Time:
Permit Effective
1030 hrs.
Date: April 27, 2007
Dow Corning Corporation
2914 Patterson Street
Greensboro, NC 27407
Exit Time:
Permit Expiration
1145 hrs.
Date: April 26, 2012
Name(s) of On -Site Representative(s):
Title(s):
Phone No(s):
Ronica Edgerton
EHS&S Engineer
[phone]
Phil Rumley
Name, Address of Responsible Official:
Title: Greensboro Site Manager
Phone No. [phone]
Contacted? No
Pamela Berry
Dow Corning Corporation
2914 Patterson Street
Greensboro, NC 27407
Section C: Areas Evaluated During Inspection (check only those areas evaluated)
® Permit NA
Flow Measurement NA Operations/Maintenance
NA Sewer Overflow
® Records/Reports ®
Monitoring Program NA Sludge Handling/Disposal NA Pollution Prevention
® Facility Site Review NA
Compliance Schedules NA Pretreatment
® Effluent/Receiving Waters NA
Laboratory NA Stormwater
Section D: Summary of Findings/Comments
See the cover letter and attached inspection form for specific comments.
Name(s) and Signature(s) of Inspectors:
Agency/Office/Telephone:
Date:
DWQ I WSRO I [phone]
r
Signature of Reviewer:
Agency/Office:
Date:
DWQ / WSRO / [phone]
EPA Form 35A0-3 (Rev 9-04)

Permit: NCS000077 Owner - Facility: Dow Corning Corporation
Inspection Date:. 06/06/2012 Inspection Type: Compliance Evaluation
Reason for Visit:
Routine
Stormwater Pollution Prevention Plan
Yes
No
NA
NI -
Does the site have a Stormwater Pollution Prevention Plan?
■
n
n
n
# Does the Plan include a General Location (USGS) map?
■
❑
❑
n
# Does the Plan include a "Narrative Description of Practices"?
■
n
n
Q
# Does the Plan include a detailed site map including outfall locations and drainage areas?
■
n
n
n
# Does the Plan include a list of significant spills occurring during the past 3 years?
■
n
n
n
# Has the facility evaluated feasible alternatives to current practices?
■
n
n
n
# Does the facility provide all necessary secondary containment?
■
❑
n
n
# Does the Plan include a BMP summary?
■
n
n
n
# Does the Plan include a Spill Prevention and Response Plan (SPRP)?
®
n
n
n
# Does the Plan include a Preventative Maintenance and Good Housekeeping Plan?
■
n
n
n
# Does the facility provide and document Employee Training?
■
n
n
n
# Does the Plan include a list of Responsible Party(s)?
■
n
n
n
# Is the Plan reviewed and updated annually?
■
n
n
n
# Does the Plan include a Stormwater Facility Inspection Program?
®
n
n
n
Has the Stormwater Pollution Prevention Plan been implemented?
■
n
n
n
Comment: Part II, Section A of the permit requires that Dow Corning develop and
implement a Stormwater Pollution Prevention Plan (SPPP). A copy of the plan was
available for review. The plan was thorough and complete and was last updated
October 4, 2011.
Qualitative Monitoring Yes No NA NE
Has the facility conducted its Qualitative Monitoring semi-annually? ■ ❑ ❑ ❑
Comment: Part Il, Section C of the permit requires that qualitative (visual) monitoring
be conducted semi-annually at each outfall. The last two monitoring events occurred on
May 30, 2012 and October 11, 2011. These qualitative records do not need to be
submitted to the Division, but must be kept on file at the facility for a period of five years.
Analytical Monitoring
Has the facility conducted its Analytical monitoring?
# Has the facility conducted its Analytical monitoring from Vehicle Maintenance areas?
Yes No NA NE
■ n n n
❑ ❑ ■ ❑
Page: 3

Permit: NCS000077 Owner -Facility: Dow Corning Corporation
Inspection Date: 06/06/2012 Inspection Type: Compliance Evaluation Reason for Visit: Routine
Comment: Part 11, Section B of the permit requires the collection of semi-annual
analytical samples from each outfall. The last two monitoring events for which data was
available occurred on September 21, 2011 and May 12, 2011 (results from samples
collected 5-30-12 not back from the laboratory). Benchmark exceedences were noted
in the September sampling event for TSS at outfalls 2, 5 and 6 and for pH at outfalls 5
and 6. It is believed that the exceedences were due to construction activity occurring at
building 2. Follow-up samples collected 10-19-11 for outfalls 2, 5 and 6 showed all
values to be below benchmark levels. It was noted that no analytical data was available
for 2008-2010. The facility explained that this was due to difficulty in obtaining samples
during low flow conditions.
The on -site vehicle maintenance monitoring referenced in Part II, Section D of the
permit is not applicable since Dow Corning uses less than 55 gallons of new motor oil
per month when averaged over the calendar year
Permit and Outfalls Yes No NA NE
# Is a copy of the Permit and the Certificate of Coverage available at the site? 0 Cl Q Q
# Were all outfalls observed during the inspection? ■ ❑ Q Cl
# If the facility has representative outfall status, is it properly documented by the Division? 0 0 ■ ❑
# Has the facility evaluated all illicit (non stormwater) discharges? ■ I] n fl
Comment: Observations revealed that the Dow Corning site was clean and well
managed. The tanker loadinglunloading areas, tote and drum storage areas and
containment dikes had locked valves to control stormwater releases. Records were
being kept to document the date, time and observations of the release.
During the inspection the location of outfall #2 was discussed. It is our understanding
that it will be relocated closer to the property boundary along Patterson Street. This will
require that the SPPP and site map be revised to note the new location.
Previously, by letter dated May 2, 2007 from the Division, Dow Corning was granted
representative outfall status to sample outfall #2 as representative of outfall #1. It is our
understanding that due to construction changes at the facility Dow is now performing
analytical sampling again at outfall #1 since the representative outfall status is no longer
applicable.
Page: 4

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SCALE
DOW CORNING CORPORATION SITE DRAINAGE MAP
PROJECT NO. 104-0011 STORM WATER DISCHARGE PERMIT RENEWAL
DOW CORNING CORPORATION
GREENSBORO• GUILFORD COUNTY, NORTH CAROLINA C R D! N A L
LVMiENT WTE 07/25/11 ISITE PLAN 6-10-1 I o. SMFEi 1 - 2 SCFLE AS NOTED RESOURCES ,+M — O

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I

A��ma
NCDENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
Ms. Jane Waldorn
Dow Corning Corporation
2914 Patterson St
Greensboro, NC 27407
Dear Permittee:
Division of Water Quality
Coleen H. Sullins
Director
September 2, 2011
Dee Freeman
Secretary
RECEIVED
J N.C. Ceot. of ENR
SEP 0 6 2011
Winston-Salem
Regional OFFU
Subject: NPDES Stormwater Permit Coverage Renewal
Dow Corning Corporation
Permit Number NCS000077
Guilford County
Your facility is currently covered for stormwater discharge under NPDES Permit NCS000077. This
permit expires on April 26, 2012, To assure consideration for continued coverage under your
individual permit, you must apply to the Division of Water Quality (DWQ) for renewal of your permit.
Enclosed you will find an individual permit Renewal Application Form, Supplemental Information
request, and Stormwater Pollution Prevention Plan Certification for your facility.
Filing the application form along with the requested supplemental information will constitute your
application for renewal of this permit. Until your permit renewal is completed and you receive a new
permit, please continue to comply with all conditions and monitoring requirements in your expired
NPDES stormwater permit.
The application and supplement must be completed and returned to DWQ by October 29, 2011.
Failure to request renewal within this time period will result in delay of your permit renewal and may
result in a civil assessment. Discharge of stormwater from your facility without coverage under a valid
stormwater NPDES permit would constitute a violation of NCGS 143-215.1 and could result in
assessments of civil penalties of up to $25,000 per day.
If you have any questions regarding permit renewal procedures please contact Brian Lowther of the
Stormwater Permitting Unit at (919)-807-6368 or [e-mail].
Sincerely,
Bradley Bennett, Supervisor
Stormwater Permitting Unit
Cc: Central Files
SPU Files
Winston Salem Regional Office
1617 Mail Service Center Ralegh, North Carolina 2i399-1617
Location: 512 N. Salisbur,r St. Raleigh, North Carolin'i 27604
Phone [phone] FAX: 919-P17-64921 Customer Servic 1-877-623-6748
tnternei www.ncwaterqu•ility.org
An Equal Opportunity 1 Affirmative Acliorl Employer
Nortr.Carohna
NaE-wra!!y

�C,FWATp, G Permit Coverage
MRenewal Application Form
r National Pollutant Discharge Elimination System Permit Number
W
NC5000077
Stormwater Discharge Permit
The following is the information currently in our database for your facility. Please review this information carefully and
make all corrections/additions as necessary in the space provided to the right of the current information.
Owner Affiliation Information
Owner / Organization Name:
Owner Contact:
Mailing Address:
Phone Number:
Fax Number:
E-mail address:
* Reissued Permit will be mailed to the owner address
Dow Corning Corporation
Ms. Jane Waldorn
2914 Patterson St
Greensboro, NC 27407
[phone]
Facility/Permit Contact Information
Facility Name: Dow Corning Corporation
Facility Physical Address: 2914 Patterson St
Greensboro, NC 27407
Facility Contact:
Mailing Address:
Phone Number:
Fax Number:
E-mail address:
Discharge Information
Receiving Stream South Buffalo Creek
Stream Class:
Basin:
Sub -Basin:
Number of Outfalls:
WS-V;NSW
Cape Fear River Basin
03-06-02
Impaired Waters/TMDL
Does this facility discharge to waters listed as impaired or waters with a finalized TMDL? ❑ Yes ❑ No ❑ Don't Know
( for information on these waters refer to http://hzo.enr.state.nc.us/su/lmpaired Waters TMDL/ )
CERTIFICATION
I certify that I am familiar with the information contained in the application and that to the best of my knowledge and
belief such information is true, complete and accurate.
Signature
Print or type name of person signing above
Date
Title
Please return this completed renewal application form to: Stormwater Permitting Unit
Attn: Brian Lowther
1617 Mail Service Center
Raleigh, North Carolina 27699-1617

WOOD`.
KEY
AREAS
4 .q
--CONCRETE AREA
TOTAL AREA OF
CONCRETE
= 108,395 SO. FT.
TOTAL AREA OF
ASPHALT
= 49,467 SO. FT.
TOTAL AREA OF
GRAVEL =
4,387 SQ. FT.
_14"I.TAi AREA OF
GRASS =
130,490 SO. FT. -ASPHALT AREA
TOTAL AREA OF
BUILDINGS
= 125,161 SQ. FT,
` OUTFALL 005 OUTFALL 004
COMSOM DISCHARGE FROM
ALL BITE OUTFALI_S
BROWN UP AREA
BRIARS, WEEDS
SCALE 1"=40'_O"
THIS DRAWING IS A DIGITIZED DUPLICATE OF THE ORIGINAL
SCALED DRAWING AND ALL DIMENSIONS SHOULD BE FIELD
VERIFIED
NOTE: BOUNDARY INFORMATION SHOWN IS
BASED ON DEEDS AND WAS NOT RUN
IN THE FIELD BY DAVIS--MARTIN-POWEL
& ASSOC. AT THIS TIME.
DEED REFERENCES:
D.B. 1707 PG. 424
D.B. 1867 PG. 163
D.B. 3127 PG. 149
NOTE: SPOT ELEVATIONS WERE TAKEN AT
THE DECIMAL POINT OF THE ELEVATION
UNLESS SHOWN OTHERWISE WITH A TIC
MARK.
NOTE A: MANUALLY OPERATED
STORM WATER RELEASE
OUTFALL 001-DRAINAGE FROM PROPERTY NORTH OF DOW CORNING CORPORATION - THIS COMPANY IS ASPHALT/PAVING
COMPANY. THIS OUTFALL WAS NOT SAMPLED BECAUSE THE FLOW MOVES ON TO OUTFALL 002.
IF CONTAMINANTS EXIST IN OUTFALL 002, THEN 001 WILL HAVE TO BE SAMPLED TO
DETERMINE IF DOW CORNING OR OTHER COMPANIES ARE THE SOURCE.
OUTFALL 002-DRAINAGE COMES FROM ROOFS OF BUILDINGS NO. 5 AND NOA, CONCRETE AND ASPHALT AREAS
EAST OF THIS POINT. STORM LINE RUNS UNDERGROUND BEHIND BUILDINGS NO.1 AND NO.5.
INTAKE ALSO PROBABLE FROM PROPERTY TO THE NORTH,
OUTFALL 003--DRAINAGE FROM ROOF OF BUILDING NO. 2 AND GRASS AREAS. THIS POINT WAS NOT SAMPLED
BECAUSE BUILDING NO. 2 IS ADMINISTRATIVE AND LAB. NO INDUSTRIAL PROCESSES
OCCUR IN THIS BUILDING.
OUTFALL 004-DRAINAGE AREA IS GRASS, CONCRETE, AND ASPHALT AREAS BETWEEN BUILDINGS NO. 2 AND
NO. 3. ALSO LOADING AREA IN FRONT OF BUILDING NO. 3. THIS OUTFALL WAS NOT
SAMPLED BECAUSE IT WAS PFRCFiVFn THAT 0t1TFAi I NO 5 WOHI n RF A RFPRFgFNTATIVF
MAP BENCH MARK IS A DISK STAMPED
V 182 SET IN THE TOP OF THE WEST
END OF THE SOUTHWEST CONC. WINGWALL
OF A RAILROAD OVERPASS FOR HOLDEN
ROAD. ELEV. 871.49
SITE DRAINAGE MAP
PROPERTY OF
DOW CORNING CORP.
MOREHEAD TOWNSHIP
GUILFORD COUNTY
GREENSBORO, N.C.
J
R TY OF
�. HENDRICKS
'6 PG. 39
1 PG. 33

EMT. CONC. DRAIN
AREAS
TOTAL
AREA
OF
CONCRETE
= 108,395 SO. FT.
TOTAL
AREA
OF
ASPHALT
= 49,467 SQ. FT.
TOTAL.
AREA
OF
GRAVEL =
4,387 SQ. FT.
TOTAi.
AREA
OF
GRASS
130,490 SQ. FT.
TOTAL
AREA
OF
BUILDINGS
= 125,161 SO. FT.
TOTAL
AREA
OF
CONTAINMENT STRUCTURES = 7,532 SQ, FT.
$60) 'n,
Ex. 38' RCP--,
HAZARDOUS WASTE
STORAGE
OU TFA LL 005
COMS*M DlWiARGE FROM
ALL 817E OUTFALLS
GMWN UP AREA
SRLAAB, WEEDS
SCALE 1"=40'-O"
THIS DRAWING IS A DIGITIZED DUPLICATE OF THE ORIGINAL
SCALED DRAWING AND ALL DIMENSIONS SHOULD BE FIELD
VERIFIED
KEY
4 .a
$ CONCRETE AREA
a a
-ASPHALT AREA
--GRASS AND PLANTED AREA
+++++*+ --GRAVEL
+ + +
OUTFALL 004
NOTE: BOUNDARY INFORMATION SHOWN IS
BASED ON DEEDS AND WAS NOT RUN
IN THE FIELD BY DAVIS--MARTiN-POWEL
& ASSOC. AT THIS TIME.
DEED REFERENCES:
D.B. 1707 PG. 424
D.B. 1867 PG, 163
D.B, 3127 PG. 149
SOUTHERN RAILROAD
DRAINAGE FROM ^PAC CO.
OL17FALL 001
DRAINAGE BASIN
OU TFALL 001
R
1173"42'00'E� x
136F
ROME """" EX. STORM m"
TOP M02
doom "'�` QY�• . y
INV. a33.95
NOTE: SPOT ELEVATIONS WERE TAKEN AT
THE DECIMAL POINT OF THE ELEVATION
UNLESS SHOWN OTHERWISE WITH A TIC
MARK.
NOTE A: MANUALLY OPERATED
STORM WATER RELEASE
OUTFALL 001-DRAINAGE PROM PROPERTY NORTH OF DOW CORNING CORPORATION - THIS COMPANY IS ASPHALT/PAVING
COMPANY. THIS OUTFALL WAS NOT SAMPLED BECAUSE THE FLOW MOVES ON TO OUTFALL 002.
IF CONTAMINANTS EXIST IN OUTFALL 002, THEN 001 WILL HAVE TO BE SAMPLED TO
DETERMINE IF DOW CORNING OR OTHER COMPANIES ARE THE SOURCE.
OUTFALL 002-DRAINAGE COMES FROM ROOFS OF BUILDINGS NO. 5 AND NOA, CONCRETE .AND ASPHALT AREAS
EAST OF THIS POINT. STORM LINE RUNS UNDERGROUND BEHIND BUILDINGS NO.1 AND N0.5.
INTAKE ALSO PROBABLE FROM PROPERTY TO THE NORTH,
OUTFALL 003-DRAINAGE FROM ROOF OF BUILDING NO. 2 AND GRASS AREAS. THIS POINT WAS NOT SAMPLED
BECAUSE BUILDING NO. 2 IS ADMINISTRATIVE AND LAB. NO INDUSTRIAL PROCESSES
OCCUR IN THIS BUILDING.
OUTFALL 004-DRAINAGE AREA IS GRASS, CONCRETE, AND ASPHALT AREAS BETWEEN BUILDINGS N0, 2 AND
NO. 3. ALSO LOADING AREA IN FRONT OF BUILDING NO. 3. THIS OUTFALL WAS NOT
SAMPLED BECAUSE IT WAS PERCEIVED THAT OUTFALL NO. 5 MOULD BE A REPRESENTATIVE
OUTFALL. ALL MATERIALS GOING INTO BUILDING 3 ARE STORED AND MANUFACTURED IN
THAT BUILDING AND WOULD BE REPRESENTED IN OUTCALL 005.
OUTFALL 005--DRAINAGE OF FROM STORAGE BUILDING AND BUILDING NO. 3. ALSO CONCRETE AREA BEHIND
BUILDING NO. 3. CONCRETE CHANNEL WOULD COLLECT DISCHARGE FROM PROPERTY TO THE NORTH
AS WELL AS WOODED GRASSY AREA TO THE WEST.
HAZARDOUS WASTE
STORAGE
4DPA GLGr. to-T�.vr
TOP EXi$T. IRON PIPE
1
L6g� OQ �%W ALE. �����
�..*
COULD NOT OPEN INV. $45.87
DRAINAGE FROM FRONT OF SUM" NO. 3
POINT NOT SAMPLED BECAUSE ONLY ROOF
DRAINS FROM OVER OFFICE AREA.
VALVE 6c MET1rR
MATERIALS
LOADING
NON-14AZAROWS
WASTE
STORAGE
sa
PROPERTY OF
KENNETH A. HENDRICKS
Q.B. 3476 PG. 39
P.B. 81 PG. 33
0 Ho" ROAD---r
'7.1
MAP BENCH MARK IS A DISK STAMPED
V 182 SET IN THE TOP OF THE WEST
END OF THE SOUTHWEST CONC. WINGWALL
OF A RAILROAD OVERPASS FOR HOLDEN
ROAD. ELEV. 871.49
SITE DRAINAGE MAP
PROPERTY OF
DOW CORNING CORP.
MOREHEAD TOWNSH#P
GUtLPORD COUNTY
GREENSBORO, N.C.

r. Corey Basi r
DWQ Re at Office, Winston Salem
aughtown St
Winston-Salem, NC 27107
Dear Mr. Basinger:
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
February 8, 2007 RECEIVED
N C oect of ENR
FEB 12 2007
Winston-Salem
Regional Office
Subject: Individual Permit No. NCS 000077
Dow Corning Incorporated
Guilford County
Enclosed with this letter is a review of the individual permit for Dow Corning and supporting
documentation. Please provide input on the issuance of this permit by March 8, 2007.
If you have any questions or comments concerning these documents, please contact me at [phone]
x376 or kelty.pjohnson@ncmai].net.
Sincerely,
J-tk-
Kelly Johnson
Environmental Engineer
enc., Staff report
Draft permit
Permit application C
cc: Central Filest�-
Stormwater Permitting Unit File, NCS 000077 r S 4�
("44,
?sPMhCarolina
Naturally
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: www,ncwaterqualityyorg Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax [phone].623-6748
An Equal Opportunity/Affirmative Action Employer— 50% Recydedl10% Post Consumer Paper

r T
NCS 000077
W A rF Michael F. Easley, Governor
�D�O 9QG William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
0 Alan W. Klimek, P. E. Director
> Division of Water Quality
-C Coleen H. Sullins, Deputy Director
Division of Water Quality
STAFF REVIEW AND EVALUATION
NPDES Stormwater Permit
Facility Name:
Dow Corning Corporation
NPDES Permit Number:
NCS000077
Facility Location:
Greensboro, NC (Guilford County)
Type of Activity:
Silicone manufacturing and packaging
Receiving Streams:
UT to South Buffalo Creek, See Figure 1
River Basin:
Cape Fear River Basin, Sub -basin 03-06-02
Stream Classification:
C, NSW
Proposed Permit Requirements:
See attached draft permit.
Monitoring Data:
See Tables 1, 2, and 3
Facility Location:
See Figure t
Response Requested by (Date):
3 i g is
Central Office Staff Contact:
Kelly Johnson, [phone], ext. 376
Documents Reviewed:
• NPDES Stormwater Permit Application Materials
• Stormwater Permit File
• Analytical and Qualitative Monitoring on file with the Division
• Cape Fear Basinwide Plan, 2005
• Draft 2006 303(d) List, 2006
• EPA Sector -Specific Permit, 2006 draft
Previous Permits and Activities:
• August 31, 1994: Letter containing a permit effective October 1, 1994 until August 31, 1999.
• December 10, 1999: Letter containing a permit effective January 1, 2000 until December 31, 2004.
• July 9, 2004: Division received the permit application.
• December 3, 2004: Division acknowledged receipt of the permit application.
�11
NGDFN_R_
N. C. Division of Water Quality 1617 Mail Service Center Raleigh, North Carolina 27699-1617 [phone] Customer Service
1-877-623-6748

NCS000077
Figure 1: Facility Location
Tti�Qitm j
I mill,
OW
IN —Air
v
44-
"Tv
:vv
eyR� earl
a
��, k � _0 I �
Dow
Coming
2

NCS000077
Sampling Data:
Tables 1, 2, and 3 below summarize the data on file from the applicant. All values provided are represented to
the number of significant figures in the file.
Table 1: Su mary of Anal tical Monito ing Data Rainfall Information
Required
Sampling
Range
Date
Total
Rainfall
in
Event
Duration
min
Total Flow
(Mgai)
Q1, 2003
13-Mar-03
0.50
120
13.6
Q2, 2003
5-A r-03
0.24
120
6.5
Q3, 2003
2-Jul-03
0.56
120
15.2
Q4, 2003
28-Oct-O
0.27
120
7.3
Table 2: Summary of Analytical Monitoring Data, Analytical Information
TN
m IL
TP
m IL
TSS
m !L
Benchmark:
30 (mglL)
Benchmark:
2 (mglL)
Benchmark:
100 (mg/1)
Required
Sampling
Ranae
Date
Outfall #1
Q1, 2003
13-Mar-0
1.75
0.128
34.3
Q2, 2003
5-Apr-03
2,11
0.661
6
Q3- 2003
2-Jul-0
2.98
' — 0:596
�3.4'
Q4, 2003
28-Oct-0
<1.0
�2Y3
22.5
Required
Sampling
Ranae
Date
Outfall #2
Q1, 2003
13-Mar-0
3.04
0.851
90
Q2, 2003
5-Apr-03
1.86
0.625
5.33
Q3, 2003
2-Jul-0
1.30
0.192
72.0
Q4, 2003
28-Oct-0
<1.0
0.666
22.2
Required
Sampling
Ran e
Date
Outfall #3
Q1, 2003
13-Mar-0
1.59
0.104
6.0
Q2, 2003
5-Apr-0
1.79
0.223
20.0
Q3, 2003
2-Jul-0
2.35
0.180
6.0
Q4, 2003
28-Oct-0
0.670
0.551
10.4
Required
Sampling
Ran e
Date
Outfall #4
Q1, 2003
13-Mar-0
1.97
0.545
163
Q2, 2003
5-Apr-0
1.71
0.274
18.6
Q3, 2003
2-Jul-0
1.42
<0.050
10.2
Q4, 2003
28-Oct-0
<1.0
0.510
6.6
Required
Sampling
Ran e
Date
Outfall #5
Q1, 2003
13-Mar-0
4.23
0,709
�WUW
Q2 2003
5-Apr-0
<1.0
0,583
87
Q3, 2003
2-Jul-0
<1.0
0.089
M.41
Q4, 2003
28-Oct-0
1.96
0.211
�71710

NCS000077
Color
Odor
Clarity
Floating Solids
Suspended Solids
Foam
Oil Sheen
Other
Central Office Review Summary:
Table 3: Qualitative Monitoring
1 2 3 4 6
Good
Good
Good
Good
Good
None
None
None
None
None
Good
Good
Good
Good
Good
None, just
leaves
None, just
leaves
None, just
leaves
None, just
leaves
None, just
leaves
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
I None
I None
I None I
None
1. General Observations: This facility drains to NSW waters, and has consistently been under the benchmark
for nitrogen. Of the four samples for each of five outfalls, only one phosphorus sample was over the
benchmark, and not excessively above it. The permittee has had consistent TSS exceedances at outfall
number five. This may be due to the layout of the facility.
The site map shows that outfall number one is at the northern most part of the facility. This side of the
property borders an asphalt company. Outfall number one had one TSS exceedance. Outfall number one
drains to the collection point of outfall number two, which drains to number three, then to number four,
and then to number five. It is likely that outfall number five has high TSS readings because it is the final
collection point.--It-is likely that .solids-fromxhe-asphalt company flow -onto the-permittee's site._The--- ----
reviewer recommends that the permittee control offsite TSS as much as possible while also working to
control any onsite TSS,
2. Impairment: This facility drains to an unnamed creek of South Buffalo Creek. The 303(d) list divides
Stream Index Number 16-11-14-2 into three parts; a, b, and c. This facility drains to "a", which is
classified as from the source of the creek to McConnell Road. This 15.4-mile section was impaired in 1998
for biological integrity, and in 2006 for turbidity standard violation. Both the 303(d) list and the Basinwide
Plan cite MS4 NPDES as the source for this stress on the creek.
3. Significant Facility Changes Since Previous Permit: A Mix and blend operation within building number
five was shut down in 2000. In 2003, a hot melt process was started up in building number three. The raw
materials used in this process have containment structures. The applicant says that neither change has
impacted the site stormwater program.
Qualitative Monitoring:
The qualitative monitoring for this facility does not highlight any problems.
Analytical Monitoring:
1. Benchmarks have been added to this draft permit.
2. All analytical monitoring has been changed to semi-annual.
3. The flow reporting requirement has been removed per DWQ revised strategy. (The total rainfall and event
duration parameters have been retained.)
4. The permittee is required to collect all of the analytical monitoring samples during representative storm
events as defined in this permit. This is not a change from their previous permit. Qualitative monitoring
does not have to be performed during a representative storm event.
4

NCS000077
Other Proposed Changes to the Previous Permit:
l . Part II Section A has been revised. It now specifies all of the items to include on the site map. The
permittee is required to submit a revised map to the Division. This is due one year after the effective date
of the permit.
Recommendations: Based on the documents reviewed, the ap lication submitted on July 9, 2004 is sufficient to
issue an Individual Stormwater Permit.
Prepared by (Signature) Date r
Stormwater Permitting Unit Supervisor 7�G e� / -� Date 7
Concurrence by Regional Office Date
Water Quality Supervisor Date
Regional Office Staff Comments
62H God�]L nq-errs Tb per-/r% $E SOeE To A'A D
S7L�M �/AfizG Plecog Ta c�-�4-Ss.�ic.vt,4.J _
5

Permit No. NCS000077
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT NO. NCS000077
TO DISCHARGE STORMWATER UNDER THE
NATIONAL POLLUTAP
In compliance with the provisions of North Carolina General Statute`l43-215.1, other lawful
standards and regulations promulgated and adopted byjlie.North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
Dow CCo�g oinin, Corporation
is hereby authorized to discharges ormwater.fr�omm a facility located at
291�4 Patterson Street
'Greensboro, NC
Guilford County
U 7-
to receiving waters designated as , a class C, NSW stream in the Cape Fear River Basin, in
accordance with the discharge limitations, monitoring requirements, and other conditions set
forth in Parts I, 11, III, IV, V and VI hereof.
This permit shall become effective Month Day, 2007.
This permit and the authorization to discharge shall expire at midnight on Month Day, 2012.
Signed this day Month Day, 2007.
for Alan W. Klimek, P.E., Director
Division of Water Quality
By the Authority of the Environmental Management Commission

0
Permit No. NCS000077
PART I
Section A:
Section B:
Section C:
PART II
Section A:
Section B:
Section C:
Section D:
I=7.1Oka r111
TABLE OF CONTENTS
INTRODUCTION
Individual Permit Coverage
Permitted Activities
Location Map`
MONITORING, CONTROLS, AND LIMITATIONS FOR PERMITTED
DISCHARGES
Stormwater Pollution Prevention Plan
Analytical Monitoring Requirementsf
Qualitative Morutartng Re\riirements
On -Site Vehicle Mairiten,
STANDARD CONDITIONS
e Monitoring Requirements
Section A: Compliance and Liability
1. Compliance Schedule
2. Duty to Comply
3. Duty to Mitigate
4. Civil and Criminal Liability
5. Oil and Hazardous Substance Liability
6. Property Rights
7. Severability
8. Duty to Provide Information
9. Penalties for Tampering
10. Penalties for Falsification of Reports
Section B: General Conditions
1. Individual Permit Expiration
2. Transfers
u

Permit No. NCS000077
3. Signatory Requirements
4. Individual Permit Modification, Revocation and Reissuance, or
Termination
5. Permit Actions
Section C: Operation and Maintenance of Pollution Controls
1. Proper Operation and Maintenance
2. Need to Halt or Reduce Not a Defense
3. Bypassing of Stormwater Control Facilities
Section D:
Monitoring and Records \'�
1. Representative Sampling
2. Recording Results
/< >
3. Flow Measurements
l
4. Test Procedures
5. Representative Ouffall
6. Records Retention
7. lnspectiom_an&Entry,
Section E:
Reporting Requirements
Reports
1. Disc arge, onitoring
2. Submitting Reports
3. Availability of Reports
4. Non-Stormwater Discharges
5. Planned Changes
6. Anticipated Noncompliance
7. Bypass
8. Twenty-four Hour Reporting
9. Other Noncompliance
10. Other Information
PART IV
LIMITATIONS REOPENER
PART V
ADMINISTERING AND COMPLIANCE MONITORING FEE
REQUIREMENTS
PART VI
DEFINITIONS

Permit No. NCS000077
PART 1 INTRODUCTION
SECTION A: INDIVIDUAL PERMIT COVERAGE
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.
SECTION B: PERMITTED ACTIVITIES
Until this permit expires or is modified or revoked; the permittee s authorized to discharge
stormwater to the surface waters of North Carolina onsepar'ate storm sewer system which has
been adequately treated and managed in accordance with the terms -and conditions of this
individual permit. All discharges shall be in accordance with the conditions of this permit.
Any other point source discharge to surface waters-6 f the state is prohibited unless it is an
allowable non-stormwater discharge or is covered by.another permit, authorization or approval.
The discharges allowed by this individual permit shall.no cause or contribute to violations of
Water Quality Standards.
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.
Part 1 Page 1 of 2

SECTION C: LOCATION MAP Permit No. NCS000077
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Latitude: 36'03'27" N NCS000077 Facility
Longitude: 79'50'43" W
-County: Guilford Dow Corning Location'
Stream Class: C, NSW Corporation
Receiving Stream: UT to Buffalo Creek
Sub-basin: 03--06-02 (Cape hear River Basin) x ttAh 1:211,000
Part I Page 2 of 2

Permit No. NCS000077
PART II MONITORING, CONTROLS, AND LIMITATIONS FOR
PERMITTED DISCHARGES
SECTION A: STORMWATER POLLUTION PREVENTION PLAN
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 III, Standard
Conditions, Section E, Paragraph 3 of this individual permit. The Plan shall include, at a
minimum, the following items:
1. 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. A general location map (USGS quad ra ngl'e.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 gitude of the point(s) of discharge.
b. A narrative descripti�of Storage practices, loading and unloading activities,
outdoor process areas, dust•or particulate generating or control processes, and
waste disposal,practices�rz
C. A site map drawn to"s- cale with the following items:
(1) Distance legend and north arrow
(2) Location of industrial activities (including storage of materials,
disposal areas, process areas and loading and unloading areas)
(3) Drainage structures
(4) Delineated drainage areas for each outfall
(5) Drainage area for each outfall in acres and percentage of
each drainage area that is impervious
(6) Building locations
(7) Existing BMPs and impervious surfaces
(8) For each outfall, a narrative description of the potential pollutants that
could be expected to be present in the stormwater discharge.
d. A list of significant spills or leaks of pollutants that have occurred at the facility
during the 3 previous years and any corrective actions taken to mitigate spill
impacts.
e. 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 I11, Standard Conditions, Section
B, Paragraph 3.
Part 11 Page l of 8

Permit No. NCS000077
2. 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:
a. 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.
b. Secondary Containment Schedule. A schedule to\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 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®a\nd dry weather flow, prior to release of the accumulated
stormwater. Accumulated�storrrtwater shall be released if found to be
uncontaminated by the material stored within the containment area. 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.
C. BMP Summary. A narrative description shall be provided of Best Management
Practices (BMPs) to be considered such as, but not limited to, oil and grease
separation, debris control, vegetative filter strips, infiltration and stormwater
detention or retention, where necessary. The need for structural BMPs shall be
based on the assessment of potential of sources to contribute significant quantities
of pollutants to-stormwater discharges and data collected through monitoring of
stormwater discharges.
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 team) responsible for implementing the
SPRP shall be identified. 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, a SPCC plan 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.
Part 11 Page 2 of 8

Permit No. NCS000077
4. Preventative Maintenance and Good Housekeeping Program. A preventative
maintenance program shall be developed. The program shall document schedules of
inspections and maintenance activities of stormwater control systems, plant equipment
and systems. Inspection of material handling areas and regular cleaning schedules of
these areas shall be incorporated into the program.
5. Employee Training. Training schedules shall be developed and training provided at a
minimum on an annual basis on proper spill response and cleanup procedures and
preventative maintenance activities for all personnel involved in 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.
ent" 6. Responsible Party. The Stormwater Pollution Previon.Plan shall identify a specific
position(s) responsible for the overall coordination/&velogmenft, implementation, and
revision to the Plan. Responsibilities for all components of the Plan shall be documented
and position assignments provided.
7. Plan Amendment. The permittee shall amend eh Plan whenever there is a change in
design, construction, operation, or mailntenance,which has a significant effect on the
potential for the discharge of pollutants tofsurface waters. The Stormwater Pollution
Prevention Plan shall bereviewed andd updated on an annual basis.
X\
The Director may notify the perrrtittee•when the Plan does not meet one or more of the
minimum requirements oaf 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 III, Standard Conditions Section B, Paragraph 3) to the Director that the changes
have been made.
8. Facility Inspection Program. Facilities are required to inspect all stormwater systems on
at least a semiannual schedule, once in the fall (September -November) and once in the
spring (April - June). The inspection and any subsequent maintenance activities
performed shall be documented, recording date and time of inspection, individual(s)
making the inspection and a narrative description of the facility's stormwater control
systems, plant equipment and systems. Records of these inspections shall be incorporated
into the Stormwater Pollution Prevention Plan.
Stormwater discharge characteristic monitoring as required in Part II of this permit shall
be performed in addition to facility inspections.
9. Implementation. The permittee shall document all monitoring, measurements,
inspections and maintenance activities and training provided to employees, including the
log of the sampling data and of activities 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 his
authorized representative immediately upon request.
Part 11 Page 3 of 8

Permit No. NCS000077
SECTION B: ANALYTICAL MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the
permittee is authorized to discharge stormwater subject to the provisions of this permit.
Analytical monitoring of stormwater discharges shall be performed as specified below 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). The permittee shall complete the
minimum ten analytical samplings in accordance with the schedule specified below in Table 2.
Monitoring results shall be compared to the benchmark valuds,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). The permittee shall evaluate the sources of any
benchmark exceedances and evaluate the effectiveness of any site BMPs. The permittee shall
review and/or update the SPPP and document any of its to address stormwater contamination.
ff� \ V
Table 1. Analytical Monitoring Require' �
Discharge
Characteristics
Units
Measurement Frequencyt
Sample
TypC2
Sample
Location3
Total Suspended Solids
rn /LN
N> Semi-annually
Grab
SDO
Oil and Grease ;
mg/L„ ;
Semi-annuallyGrab
SDO
H
standard
Semi-annually
Grab
SDO
Total Nitrogen (TN)
—rri /L
Semi-annually
Grab
SDO
Total Phosphorus (TP)
m IL
Semi-annually
Grab
SDO
Turbidity
NTU
Grab
SDO
Total Rainfall
inches
—Semi-annually
Semi-Annuall
-
-
Rainfall Event Duration
minutes
Semi -Annually-
-
Footnotes:
I Measurement Frequency: All analytical monitoring will be performed twice per year, once in the spring (April -
June) and once in the fall (September - November). See Table 2 for schedule of monitoring periods.
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. 1 f the detention pond discharges only in response
to a storm event exceeding a ten year design storm, then no analytical monitoring is required and only qualitative
monitoring shall be performed.
3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) unless representative
outfall status has been granted.
Part 11 Page 4 of 8

Permit No. NCS000077
Table 2. Monitoring Schedule
Monitoring period'
Sample Number
Start
End
Year i — Spring
1
April 1, 2007
June 30, 2007
Year I —Fall
2
September 1. 2007
November 30, 2007
Year 2 — Spring
3
April 1, 2008
June 30, 2008
Year 2 — Fall
4
September 1, 2008
November 30, 2008
Year 3 — Spring
5
April 1, 2009%
June 30, 2009
Year 3 — Fall
6
September 1,,2009
�7 November 30, 2009
Year 4 — Spring
7
April_1�201`0,, j'
June 30, 2010
Year 4 — Fall
8
September A, 2010
November 30, 2010
Year 5 — Spring
9
_April 1;.,201,1
June 30, 2011
Year 5 - Fall
10
/September;!; 2011
November 30, 2011
f 5�
Footnote r
Maintain semi-annual monitoring during permit renewal process.
Table 3. -Benchmark Values,forAnal ytical Monitoring
Discharge Characteristics
Units
Benchmark
Total Suspended Solids (
mg/L
100
Oil and Grease �� \'
mg/L
30
pH
standard
6-9
Total Nitrogen (TN)
mg/L
30
Total Phosphorus (TP)
mg/L
2
Turbidity
NTU
50
This site discharges to impaired waters experiencing problems with impaired biological integrity
and turbidity. If a Total Maximum Daily Load (TMDL) is approved for this segment of South
Buffalo Creek, the Permittee may be required to monitor for the pollutant(s) of concern in the
future and submit results to the Division of Water Quality. The Division will consider the
monitoring results in determining whether additional BMPs are needed to control the pollutant(s)
of concern to the maximum extent practicable.
If'additionalBMPs are needed to achieve the required level of control, 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.
Part 11 Page 5 of 8

Permit No. NCS000077
SECTION C: QUALITATIVE MONITORING REQUIREMENTS
Qualitative monitoring requires a visual inspection of each stormwater outfall regardless of
representative outfall status and shall be performed as specified below in Table 4. Qualitative
monitoring is for the purpose of evaluating the effectiveness of the Stormwater Pollution
Prevention Plan (SPPP) and assessing new sources of stormwater pollution. No analytical tests
are required. Qualitative monitoring of stormwater outfalls is performed when stormwater
discharge occurs but does not need to be performed during a representative storm event.
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 St water Pollution Prevention
Plan.
All qualitative monitoring will be performed twice per year, once in -the s rin Aril - June and
q g A P, Y, � P gi P )
once in the fall (September - November).
Table 4. Qualitative Monitorin Re uirements
Discharge Characteristics
Frequency
Monitoring
Locations
Color
'Semi -Annual
SDO
Odor
Semi -Annual
SDO
Clarity ��'
Semi -Annual
SDO
Floating Solids ���
Semi -Annual
SDO
Suspended Solids o
Semi -Annual
SDO
Foam
Semi -Annual
SDO
Oil Sheen
Semi -Annual
SDO
Other obvious indicators
of stormwater pollution
semi -Annual
SDO
Footnotes:
Monitoring Location: Qualitative monitoring shall be performed at each storrnwater discharge outfall (SDO)
regardless of representative outfall status.
SECTION D: ON -SITE VEHICLE MAINTENANCE MONITORING REQUIREMENTS
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
outfalls which discharge stormwater runoff from vehicle maintenance areas.
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) which discharges stormwater runoff from
Partl l Page 6 of 8

Permit No. NCS000077
vehicle maintenance areas. The permittee shall complete the minimum ten analytical samplings
in accordance with the schedule specified in Table 2 (Section B).
Monitoring results shall be compared to the benchmark values in Table 6. The benchmark
values in Table 6 are not permit limits but should be used as guidelines for the permittee's
Stormwater Pollution Prevention Plan (SPPP). The permittee shall evaluate the sources of any
benchmark exceedances and evaluate the effectiveness of any site BMPs. The permittee shall
review and/or update the SPPP and document any efforts to address stormwater contamination.
Table 5. Analytical Monitoring Requirements for On -Site Vehicle Maintenance
Discharge Characteristics
Units
Measurement
Fre uenc I
Sample
Type2
Sample
Location3
H
standard
Semi-annually�
Grab
SDO
Oil and Grease
mg/ l
Serni=annually `
Grab
SDO
Total suspended Solids
mg/1
Semi-annually
Grab
SDO
New Motor Oil' Usage
gallons/month
Semi-annually
Estimate
-
Total Rainfall
inches
rSeml-annually
Rainfall Event Duration
minutes / f`
�Semi''annually
Footnotes: �\
I Measurement Frequency: All analytical monitoring will be performed twice per year, once in the spring (April -
June) and once in the fall (September;= NolvemberY See Table 2 (Section B) for schedule of monitoring periods.
Z Z
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 iitinutes of discharge. If the detention pond discharges only in response
i '--
to a storm event exceeding a ten year design storm, then no analytical monitoring is required and only qualitative
monitoring shall be performed.
3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) that discharges
stormwater runoff from area(s) where vehicle maintenance activities occur.
Table 6.
Benchmark Values for Vehicle Maintenance Analytical Monitoring
Discharge Characteristics
Units
Benchmark.
Total Suspended Solids
mg/L
100
Oil and Grease
mg/L
30
pH
standard
6-9
Part 11 Page 7 of 8

Permit No. NCSOOOXXX
PART III STANDARD CONDITIONS FOR NPDES STORMWATER INDIVIDUAL PERMITS
SECTION A: COMPLIANCE AND LIABILITY
Compliance Schedule
The permittee shall comply with Limitations and Controls specified for stormwater discharges in
accordance with the following schedule:
Existing Facilities: The Stormwater Pollution Prevention Plan shall be developed and implemented within
12 months of the effective date of the initial permit and updated thereafter on an annual basis. Secondary
containment, as specified in Part II, Section A, Paragraph 2(b) of this permit, shall be accomplished within
12 months of the effective date of the initial permit issuance.
Proposed Facilities: The Stormwater Pollution Prevention Plan shall be developed and implemented prior to
the beginning of discharges from the operation of the industrial activity and be updated thereafter on an
annual basis. Secondary containment, as specified in Part 11, Section A, Paragraph 2(b) of this permit shall
be accomplished prior to the beginning of discharZP
ges from the operation of the industrial activity.
Dutv to Corn
The permittee must comply with all conditions of this individual permit. Any permit noncompliance
constitutes a violation of the Clean Water Act and is grounds for enforcement action; for permit
termination, revocation and reissuance, or modification; or denial of a permit upon renewal application.
a. The permittee shall comply with standards or prohibitions established under section 307(a) of the
Clean Water Act for toxic pollutants within the time provided in the regulations that establish these
standards or prohibitions, even if the permit has not yet been modified to incorporate the
requirement.
b. The Clean Water Act provides that any person who violates a permit condition is subject to a civil
penalty not to exceed $27,500 per day for each violation. Any person who negligently violates any
permit condition is subject to criminal penalties of $2,500 to $25,000 per day of violation, or
imprisonment for not more than I year, or both. Any person who knowingly violates permit
conditions is subject to criminal penalties of $5,000 to $50,000 per day of violation, or
imprisonment for not more than 3 years, or both. Also, any person who violates a permit condition
may be assessed an administrative penalty not to exceed $1 1,000 per violation with the maximum
amount not to exceed $137,500. [Ref Section 309 of the Federal Act 33 USC 1319 and 40 CFR
122.41(a)]
Under state law, a daily civil penalty of not more than twenty-five thousand dollars ($25,000) per
violation may be assessed against any person who violates or fails to act in accordance with the
terms, conditions, or requirements of a permit. [Ref. North Carolina General Statutes 143-
215.6A]
d. Any person may be assessed an administrative penalty by the Director for violating section 301,
302, 306, 307, 308, 318, or 405 of the Act, or any permit condition or limitation implementing any
of such sections in a permit issued under section 402 of the Act. Administrative penalties for Class
I violations are not to exceed $i 1,000 per violation, with the maximum amount of any Class I
penalty assessed not to exceed $27,500. Penalties for Class II violations are not to exceed $11,000
per day for each day during which the violation continues, with the maximum amount of any Class
II penalty not to exceed $137,500.
Part III Page I of 8 Pages

Permit No. NCSOOOXXX
3. Duty to Mitigate
The permittee shall take all reasonable steps to minimize or prevent any discharge in violation of this
individual permit which has a reasonable likelihood of adversely affecting human health or the environment.
4. Civil and Criminal Liability
Except as provided in Part III, Section C of this permit regarding bypassing ofstormwater control facilities,
nothing in this individual permit shall be construed to relieve the permittee from any responsibilities,
liabilities, or penalties for noncompliance pursuant to NCGS 143-215.3, 143-215.6A, 143-215.613, 143-
215.6C or Section 309 of the Federal Act, 33 USC 1319. Furthermore, the permittee is responsible for
consequential damages; such as fish kills, even though the responsibility for effective compliance may be
temporarily suspended.
5. Oil and Hazardous Substance Liability
Nothing in this individual permit shall be construed to preclude the institution of any legal action or relieve
the permittee from any responsibilities, liabilities, or penalties to which the permittee is or may be subject to
under NCGS 143-215.75 et seq. or Section 311 of the Federal Act, 33 USC 1321.
6. Proper Rights
The issuance of this individual permit does not convey any property rights in either real or personal
property, or any exclusive privileges, nor does it authorize any injury to private property or any invasion of
personal rights, nor any infringement of Federal, State or local laws or regulations.
7. Severability
The provisions of this individual permit are severable, and if any provision of this individual permit, or the
application of any provision of this individual permit to any circumstances, is held invalid, the application
of such provision to other circumstances, and the remainder of this individual permit, shall not be affected
thereby.
S. Duty to Provide Information
The permittee shall furnish to the Director, within a reasonable time, any information which the Director
may request to determine whether cause exists for modifying, revoking and reissuing, or terminating the
permit issued pursuant to this individual permit or to determine compliance with this individual permit. The
permittee shall also furnish to the Director upon request, copies of records required to be kept by this
individual permit.
9. Penalties for Tampering
The Clean Water Act provides that any person who falsifies, tampers with, or knowingly renders inaccurate.
any monitoring device or method required to be maintained under this individual permit shall, upon
conviction, be punished by a fine of not more than $10,000 per violation, or by imprisonment for not more
than two years per violation, or by both. If a conviction of a person is for a violation committed after a first
conviction of such person under this paragraph, punishment is a fine of not more that $20,000 per day of
violation, or by imprisonment of not more than 4 years, or both.
10. Penalties for Falsification of Reports
The Clean Water Act provides that any person who knowingly makes any false statement, representation, or
certification in any record or other document submitted or required to be maintained under this individual
PartI ll Page 2 of $ Pages

Permit No. NCSOOOXXX
permit, including monitoring reports or reports of compliance or noncompliance shall, upon conviction, be
punished by a fine of not more than 510,000 per violation, or by imprisonment for not more than two years
per violation, or by both.
SECTION 8: GENERAL CONDITIONS
1. Individual Permit Expiration
The permittee is not authorized to discharge after the expiration date. In order to receive automatic
authorization to discharge beyond the expiration date, the permittee shall submit forms and fees as are
required by the agency authorized to issue permits no later than 180 days prior to the expiration date. Any
permittee that has not requested renewal at least 180 days prior to expiration, or any permittee that does not
have a permit after the expiration and has not requested renewal at least 180 days prior to expiration, will be
subjected to enforcement procedures as provided in NCGS § 143-2153.6 and 33 USC 1251 et. seq.
2. Transfers
This permit is not transferable to any person except after notice to and approval by the Director. The
Director may require modification or revocation and reissuance of the permit to change the name and
incorporate such other requirements as may be necessary under the Clean Water Act. Permittee is required
to notify the Division in writing in the event the permitted facility is sold or closed.
3. Signatory Requirements
All applications, reports, or information submitted to the Director shall be signed and certified.
a. All applications to be covered under this individual permit shall be signed as follows:
(1) For a corporation: by a responsible corporate officer. For the purpose of this Section, a
responsible corporate officer means: (a) a president, secretary, treasurer or vice president
of the corporation in charge of a principal business function, or any other person who
performs similar policy or decision making functions for the corporation, or (b) the
manager of one or more manufacturing production or operating facilities employing more
than 250 persons or having gross annual sales or expenditures exceeding 25 million (in
second quarter 1980 dollars), if authority to sign documents has been assigned or
delegated to the manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship: by a general partner or the proprietor,
respectively; or
(3) For a municipality, State, Federal, or other public agency: by either a principal executive
officer or ranking elected official.
All reports required by the individual permit and other information requested by the Director shall
be signed by a person described above or by a duly authorized representative of that person. A
person is a duly authorized representative only if:
(1) The authorization is made in writing by a person described above;
(2) The authorization specified either an individual or a position having responsibility for the
overall operation of the regulated facility or activity, such as the position of plant
manager, operator of a well or well field, superintendent, a position of equivalent
responsibility, or an individual or position having overall responsibility for environmental
Part III Page 3 of 8 Pages

Permit No. NCSOOOXXX
matters for the company. (A duly authorized representative may thus be either a named
individual or any individual occupying a named position.); and
(3) The written authorization is submitted to the Director.
C. Any person signing a document under paragraphs a. or b. of this section shall make the following
certification:
"I certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
4. Individual Permit Modification Revocation and Reissuance or Termination
The issuance of this individual permit does not prohibit the Director from reopening and modifying the
individual permit, revoking and reissuing the individual permit, or terminating the individual permit as
allowed by the laws, rules, and regulations contained in Title 40, Code of Federal Regulations, Parts 122
and 123; Title 15A of the North Carolina Administrative Code, Subchapter 2H .0100; and North Carolina
General Statute 143-215.1 et. al.
5. Permit Actions
The permit may be modified, revoked and reissued, or terminated for cause. The notification of planned
changes or anticipated noncompliance does not stay any individual permit condition.
SECTION C: OPERATION AND MAINTENANCE OF POLLUTION CONTROLS
Proper Operation and Maintenance
The permittee shall at all times properly operate and maintain all facilities and systems of treatment and
control (and related appurtenances) which are installed or used by the permittee to achieve compliance with
the conditions of this individual permit. Proper operation and maintenance also includes adequate
laboratory controls and appropriate quality assurance procedures. This provision requires the operation of
back-up or auxiliary facilities or similar systems which are installed by a permittee only when the operation
is necessary to achieve compliance with the conditions of this individual permit.
2. Need to Halt or Reduce Not a Defense
It shall not be a defense for a permittee in an enforcement action that it would have been necessary to halt or
reduce the permitted activity in order to maintain compliance with the condition of this individual permit.
Bypassing of Stormwater Control Facilities
Bypass is prohibited and the Director may take enforcement action against a permittee for bypass unless:
a. Bypass was unavoidable to prevent loss of life, personal injury or severe property damage; and
b. There were no feasible alternatives to the bypass, such as the use of auxiliary control facilities,
retention of stormwater or maintenance during normal periods of equipment downtime or dry
Part III Page 4 of 8 Pages

Permit No. NCSOOOXXX
weather. This condition is not satisfied if adequate backup controls should have been installed in
the exercise of reasonable engineering judgment to prevent a bypass which occurred during normal
periods of equipment downtime or preventive maintenance; and
C. The permittee submitted notices as required under, Part III, Section E of this permit.
If the Director determines that it will meet the three conditions listed above, the Director may approve an
anticipated bypass after considering its adverse effects.
SECTION D: MONITORING AND RECORDS
I. Representative Sampling
Samples collected and measurements taken, as required herein, shall be characteristic of the volume and
nature of the permitted discharge. Analytical sampling shall be performed during a representative storm
event. Samples shall be taken on a day and time that is characteristic of the discharge. All samples shall be
taken before the discharge joins or is diluted by any other waste stream, body of water, or substance.
Monitoring points as specified in this permit shall not be changed without notification to and approval of
the Director.
Recording Results
For each measurement, sample, inspection or maintenance activity performed or collected pursuant to the
requirements of this individual permit, the permittee shall record the following information:
a. The date, exact place, and time of sampling, measurements, inspection or maintenance activity;
b. The individual(s) who performed the sampling, measurements, inspection or maintenance activity;
C. The date(s) analyses were performed;
d. The individual(s) who performed the analyses;
C. The analytical techniques or methods used; and
f. The results of such analyses.
Flow Measurements
Where required, appropriate flow measurement devices and methods consistent with accepted scientific
practices shall be selected and used to ensure the accuracy and reliability of measurements of the volume of
monitored discharges.
Test Procedures
Test procedures for the analysis of pollutants shall conform to the EMC regulations published pursuant to
NCGS 143-215.63 et. seq, the Water and Air Quality Reporting Acts, and to regulations published pursuant
to Section 304(g), 33 USC 1a14, of the Federal Water Pollution Control Act, as Amended, and Regulation
40 CFR 136.
To meet the intent of the monitoring required by this individual permit, all test procedures must produce
minimum detection and reporting levels and all data generated must be reported down to the minimum
detection or lower reporting level of the procedure.
Part III Page 5 of 8 Pages

Permit No. NCSOOOXXX
Representative Outfall
If a facility has multiple discharge locations with substantially identical stormwater discharges that are
required to be sampled, the permittee may petition the Director for representative outfall status. If it is
established that the stormwater discharges are substantially identical and the permittee is granted
representative outfall status, then sampling requirements may be performed at a reduced number of outfalls
Records Retention
Visual monitoring shall be documented and records maintained at the facility along with the Stormwater
Pollution Prevention Plan. Copies of analytical monitoring results shall also be maintained on -site. The
permittee shall retain records of all monitoring information, including all calibration and maintenance
records and all original strip chart recordings for continuous monitoring instrumentation, and copies of all
reports required by this individual permit for a period of at least 5 years from the date of the sample,
measurement, report or application. This period may be extended by request of the Director at any time_
Insoection and Ent
The permittee shall allow the Director, or an authorized representative (including an authorized contractor
acting as a representative of the Director), or in the case of a facility which discharges through a municipal
separate storm sewer system, an authorized representative of a municipal operator or the separate storm
sewer system receiving the discharge, upon the presentation of credentials and other documents as may be
required by law, to;
a. Enter upon the permittee's premises where a regulated facility or activity is located or conducted,
or where records must be kept under the conditions of this individual permit;
b. Have access to and copy, at reasonable times, any records that must be kept under the conditions of
this individual permit;
C. Inspect at reasonable times any facilities, equipment (including monitoring and control equipment),
practices, or operations regulated or required under this individual permit; and
d. Sample or monitor at reasonable times, for the purposes of assuring individual permit compliance
or as otherwise authorized by the Clean Water Act, any substances or parameters at any location.
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 forms provided by the Director. Submittals shall be received by the Division
no later than 30 days from the date the facility receives the sampling results from the laboratory.
2. Submitting Reports
Duplicate signed copies of all reports required herein, shall be submitted to the following address:
Division of Water Quality
Water Quality Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Part I I I Page 6 of 8 Pages

Permit No. NCSOOOXXX
3. Availability of Reports
Except for data determined to be confidential under NCGS 143-215.3(a)(2) or Section 308 of the Federal
Act, 33 USC 1318, all reports prepared in accordance with the terms shall be available for public inspection
at the offices of the Division of Water Quality. As required by the Act, analytical data shall not be
considered confidential. Knowingly making any false statement on any such report may result in the
imposition of criminal penalties as provided for in NCGS 143-215.6E or in Section 309 of the Federal Act,
4. Non-Stormwater Discharges
If the storm event monitored in accordance with this individual permit coincides with a non-stormwater
discharge, the permittee shall separately monitor all parameters as required under the non-stormwater
discharge permit and provide this information with the stormwater discharge monitoring report.
5. Planned Changes
The permittee shall give notice to the Director as soon as possible of any planned changes at the permitted
facility which could significantly alter the nature or quantity of pollutants discharged. This notification
requirement includes pollutants which are not specifically listed in the individual permit or subject to
notification requirements under 40 CFR Part 122.42 (a).
6. Anticipated Noncompliance
The permittee shall give notice to the Director as soon as possible of any planned changes at the permitted
facility which may result in noncompliance with the individual permit requirements.
7. Bypass
a. Anticipated bypass. If the permittee knows in advance of the need for a bypass, it shall submit
prior notice, if possible at least ten days before the date of the bypass; including an evaluation of
the anticipated quality and affect of the bypass.
b. Unanticipated bypass. The permittee shall submit notice within 24 hours of becoming aware of an
unanticipated bypass.
8. Twenty-four Hour Reporting
The permittee shall report to the central office or the appropriate regional office any noncompliance which
may endanger health or the environment. Any information shall be provided orally within 24 hours from
the time the permittee became aware of the circumstances. A written submission shall also be provided
within 5 days of the time the permittee becomes aware of the circumstances.
The written submission shall contain a description of the noncompliance, and its causes; the period of
noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the
anticipated time compliance is expected to continue; and steps taken or planned to reduce, eliminate, and
prevent reoccurrence of the noncompliance.
The Director may waive the written report on a case -by -case basis if the oral report has been received
within 24 hours.
9. Other Noncompliance
The permittee shall report all instances of noncompliance not reported under 24 hour reporting at the time
monitoring reports are submitted.
Part I I I Page 7 of 9 Pages

Permit No. NCSOOOXXX
10. Other Information
Where the permittee becomes aware that it failed to submit any relevant facts in an application for an
individual permit or in any report to the Director, it shall promptly submit such facts or information.
Part III Pave 8 of 8 Pages

Permit No. NCSOOOXXX
PART IV LIMITATIONS REOPENER
This individual permit shall be modified or alternatively, revoked and reissued, to comply with any applicable
effluent guideline or water quality standard issued or approved under Sections 302(b) (2) (c), and (d), 304(b) (2) and
307(a) of the Clean Water Act, if the effluent guideline or water quality standard so issued or approved:
a. Contains different conditions or is otherwise more stringent than any effluent limitation in the individual
permit; or
b. Controls any pollutant not limited in the individual permit.
The individual permit as modified or reissued under this paragraph shall also contain any other requirements in the
Act then applicable.
PART V ADMINISTERING -AND COMPLIANCE MONITORING FEE
REQUIREMENTS
The permittee must pay the administering and compliance monitoring fee within 30 (thirty) days after being billed by
the Division. Failure to pay the fee in timely manner in accordance with 15A NCAC 2H .0105(b)(4) may cause this
Division to initiate action to revoke the Individual Permit.
PART VI DEFINITIONS
Act
See Clean Water Act.
Arithmetic Mean
The arithmetic mean of any set of values is the summation of the individual values divided by the number of
individual values.
Allowable Non-Stormwater Discharges
This permit regulates stormwater discharges. Non-stormwater discharges which shall be allowed in the
stormwater conveyance system are:
(a) All other discharges that are authorized by a non-stormwater NPDES permit.
(b) Uncontaminated groundwater, foundation drains, air -conditioner condensate without added
chemicals, springs, discharges of uncontaminated potable water, waterline and fire hydrant
flushings, water from footing drains, flows from riparian habitats and wetlands.
(c) Discharges resulting from fire -fighting or fire -fighting training.
Best Management Practices (BMPs)
Measures or practices used to reduce the amount of pollution entering surface waters. BMPs may take the
form of a process, activity, or physical structure.
Parts IV, V and VI Page I of

Permit No. NCSOOOXXX
5. Bypass
A bypass is the known diversion of stormwater from any portion of a stormwater control facility including
the collection system, which is not a designed or established operating mode for the facility.
5. Bulk Storage of Liquid Products
Liquid raw materials, manufactured products, waste materials or by-products with a single above ground
storage container having a capacity of greater than 660 gallons or with multiple above ground storage
containers located in close proximity to each other having a total combined storage capacity of greater than
1,320 gallons.
7. Clean Water Act
The Federal Water Pollution Control Act, also known as the Clean Water Act (CWA), as amended, 33
USC 1251, et. seq.
R. Division or DWQ
The Division of Water Quality, Department of Environment and Natural Resources.
�. Director
The Director of the Division of Water Quality, the permit issuing authority.
10. EMC
The North Carolina Environmental Management Commission.
11, Grab Sample
An individual sample collected instantaneously. Grab samples that will be directly analyzed or qualitatively
monitored must be taken within the first 30 minutes of discharge.
12. Hazardous Substance
Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the Clean Water Act.
13, Landfill
A disposal facility or part of a disposal facility where waste is placed in or on land and which is not a land
treatment facility, a surface impoundment, an injection well, a hazardous waste long-term storage facility or
a surface storage facility.
14. Municipal Separate Storm Sewer System
A stormwater collection system within an incorporated area of local self-government such as a city or town.
15. Overburden
Any material of any nature, consolidated or unconsolidated, that overlies a mineral deposit, excluding
topsoil or similar naturally -occurring surface materials that are not disturbed by mining operations.
Part VI Page 2 of 5 Pages

Permit No. NCSOOOXXX
16. Permittee
The owner or operator issued a permit pursuant to this individual permit.
17. Point Source Discharge of Stormwater
Any discernible, confined and discrete conveyance including, but not specifically limited to, any pipe, ditch,
channel, tunnel, conduit, well, or discrete fissure from which stormwater is or may be discharged to waters
of the state.
18. 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.
19. Representative Outfall Status
When it is established that the discharge of stormwater runoff from a single outfall is representative of the
discharges at multiple outfalls, the DWQ may grant representative outfall status. Representative outfall
status allows the permittee to perform analytical monitoring at a reduced number of outfalls.
20. Rinse Water Discharge
The discharge of rinse water from equipment cleaning areas associated with industrial activity. Rinse
waters from vehicle and equipment cleaning areas are process wastewaters and do not include washwaters
utilizing any type of detergent or cleaning agent.
21. Secondary Containment
Spill containment for the contents of the single largest tank within the containment structure plus sufficient
freeboard to allow for the 25-year, 24-hour storm event.
22. Section 313 Water Priority Chemical
A chemical or chemical category which:
a. Is listed in 40 CFR 372.65 pursuant to Section 313 of Title III of the Superfund Amendments and
Reauthorization Act (SARA) of 1986, also titled the Emergency Planning and Community Right -
to -Know Act of 1986;
Is present at or above threshold levels at a facility subject to SARA title 111, Section 313 reporting
requirements; and
C. That meet at least one of the following criteria:
(1) Is listed in Appendix D of 40 CFR part 122 on either Table It (organic priority
pollutants), Table III (certain metals, cyanides, and phenols) or Table IV (certain toxic
pollutants and hazardous substances);
(2) Is listed as a hazardous substance pursuant to section 31 1(b)(2)(A) of the CWA at 40
CFR 1 16.4; or
(3) Is a pollutant for which EPA has published acute or chronic water quality criteria.
Part VI Page 3 of 5 Pages

Permit No. NCSOOOXXX
23. Severe Property Damage
Means substantial physical damage to property, damage to the control facilities which causes them to
become inoperable, or substantial and permanent loss of natural resources which can reasonably be
expected to occur in the absence of a bypass. Severe property damage does not mean economic loss
caused by delays in production.
24. Significant Materials
Includes, but is not limited to: raw materials; fuels; materials such as solvents, detergents, and plastic
pellets; finished materials such as metallic products; raw materials used in food processing or production;
hazardous substances designated under section 10](14) of CERCLA; any chemical the facility is required to
report pursuant to section 313 of Title III of SARA; fertilizers; pesticides; and waste products such as ashes,
slag and sludge that have the potential to be released with stormwater discharges.
25. Significant Spills
Includes, but is not limited to: releases of oil or hazardous substances in excess of reportable quantities
under section 311 of the Clean Water Act (Ref: 40 CFR 1 10.10 and CFR 117.21) or section 102 of
CERCLA (Ref: 40 CFR 302A).
26. Stormwater Runoff
The flow of water which results from precipitation and which occurs immediately following rainfall or as a
result of snowmelt.
27. Stormwater Associated with Industrial Activity
The discharge from any point source which is used for collecting and conveying stormwater and which is
directly related to manufacturing, processing or raw material storage areas at an industrial site. Facilities
considered to be engaged in "industrial activities" include those activities defined in 40 CFR 122.26(b)(14).
The term does not include discharges from facilities or activities excluded from the NPDES program.
28. Stormwater Pollution Prevention Plan
A comprehensive site -specific plan which details measures and practices to reduce stormwater pollution and
is based on an evaluation of the pollution potential of the site.
29. 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.
30. Total Flow
The flow corresponding to the time period over which the entire storm event occurs. Total flow shall be
either; (a) measured continuously, (b) calculated based on the amount of area draining to the outfalI, the
amount of built -upon (impervious) area, and the total amount of rainfall., or (c) estimated by the
measurement of flow at 20 minute intervals during the rainfall event.
Part VI Page 4 of 5 Pages

Permit No. NCSOOOXXX
31. Total Maximum Daily Load (TMDL)
A TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet
water quality standards, and an allocation of that amount to the pollutant's sources. A TMDL is a detailed
water quality assessment that provides the scientific foundation for an implementation plan. The
implementation plan outlines the steps necessary to reduce pollutant loads in a certain body of water to
restore and maintain water quality standards in all seasons. The Clean Water Act, section 303, establishes
the water quality standards and TMDL programs.
32. Toxic Pollutant
Any pollutant listed as toxic under Section 307(a)(1) of the Clean Water Act.
33. Upset
Means an exceptional incident in which there is unintentional and temporary noncompliance with
technology based permit effluent limitations because of factors beyond the reasonable control of the
permittee. An upset does not include noncompliance to the extent caused by operational error, improperly
designed treatment or control facilities, inadequate treatment or control facilities, lack of preventive
maintenance, or careless or improper operation.
34. Vehicle Maintenance Activity
Vehicle rehabilitation, mechanical repairs, painting, fueling, lubrication, vehicle cleaning operations, or
airport deicing operations.
35. Visible Sedimentation
Solid particulate matter, both mineral and organic, that has been or is being transported by water, air,
gravity, or ice from its site of origin which can be seen with the unaided eye.
36. 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.
Part VI Page 5 of 5 Pages

oaof warE9oG PERMIT COVERAGE
p Y RENEWAL APPLICATION FORM Permit Number
National Pollutant Discharge Elimination System NCS000077
Stormwater Discharge Permit
THIS APPLICATION MUST BE SIGNED AND RETURNED ALONG WITH THE REQUESTED SUPPLEMENTAL
INFORMATION TO THE DI V. OF WATER QUALITY IN ORDER FOR YOUR FACILITY TO QUALIFY FOR
RENEWAL OF YOUR STORMWATER PERMIT NCS000077
The following is the information currently in our database for your facility. Please review this information carefully
and make all corrections as necessary in the space provided to the right of the current information.
OWNER INFORMATION
Owner/Org. Name: DOW CORNING CORPORATION
Owner Contact:
Mailing Address:
Phone Number:
Fax Number
E-mail address:
FACILITY INFORMATION
Facility Name: DOW CORNING CORPORATION
Facility Contact:
Facility Address: 2914 PATTERSON ST
GREENSBORO, NC 27407
Phone Number:
Fax Number
E-mail address:
PERMIT INFORMATION
Permit Contact: JIM WHITLOCK
Mailing Address: 2914 PATTERSON ST
GREENSBORO, NC 27407
Phone Number: 3365477202
Fax Number:
E-mail address:
DISCHARGE INFORMATION
Discharge Receiving Water: UT SOUTH BUFFALO CREEK
Stream Class: C NSW
Basin:
Sub -Basin #: 030W2
Number of outfalls: .
CERTIFICATION
I certify that I am familiar with the information contained in the application and that to the best of my knowledge and
belief such information is true, complete and accurate. �7
Signature Date T
14CAfCt4ct C a_ry[5i j
Print or type name of person signing above
Please return this completed renewal application form to:
Individual Permit Renewal
Attn:
Stormwater and General Permits Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Title &a j (;&•r00

Dow Corning. Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Analytical Monitoring Results
June 30, 2004
Parameters
1Q2003
2Q2003
3Q2003
4Q2003
..., '"y. .yc�., '`.•.,�'.. 4d.'f'"' fi?.q'� aF'L�.d. .s Sv Y ✓.1"l+�3P „� . `r*i
Tj
Date of Rain
3/13/03
4/05/03
7/02/03
10/28/03
Total rainfall,
0.50
0.24
0.56
0.27
inches.
Event duration,
120
120
120
120
minutes
Total Flow, M
13.6
6.5
15.2
7.3
Gallons
..s 1 tcal ResultsAF
_.,.. '' �_„ m•c»_��..�..... .s r- .aw .. -, �rr.t:�_ E.w"i'i' 6 _�r..e �R.::::6-aT$ _.. ,.�:"'._n.l .G �R:"'-�.
Total Nitrogen,
1.75
2.11
2.98
<1.0
mg/1
Total
Phosphorus,
0.128
0.661
0.596
2.30
m
Total
Suspended
34.3
6.0
346
22.5
Solids, m
-D-RID, Ww
OutfOW2AM
Total Nitrogen,
3.04
1.86
1.30
<1.0
mg/1
Total
Phosphorus,
0.851
0.625
0.192
0.666
m
Total
Suspended
90.0
5.33
72.0
22.2
Solids, mg/1

R+gr� $
S
�Z4g'C-�
."
Total Nitrogen,
1.59
1.79
2.35
0.670
mg/l
Total
Phosphorus,
0.104
0.223
0.180
0551
m 1
Total
Suspended
6.0
20.0
6.0
10.4
Solids, m
'
FV'Ou4ia11 #4t� , ���
`V7.
�yp�
<;
i .. .r>;'�:' 9 s �'.��5 rt - 5S> -.1. "nG -,s tt ... Y �R Is.•,.
Total Nitrogen,
1.97
1.71
1.42
<1.0
mg/l
Total
Phosphorus,
0.545
0.274
<0.050
0.510
mg/l
Total
Suspended
163
18.6
10.2
6.6
Solids, m
Total Nitrogen,
4.23
<1.0
<1.0
1.96
mg/l
Total
Phosphorus,
0.709
0.583
0.089
0.211
mg/l
Total
Suspended
1,972
87
401
776
Solids, mg/1

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Visual Monitoring Results Summary
June 30, 2004
Comments
Outfall Number
1
2
3
4
5
Color
Good
Good
Good
Good
Good
Odor
None
None
None
None
None
Clarity
Good
Good
Good
Good
Good
Floating
Solids
None
(normal)
Leaves fall
None
(normal)
Leaves fall
None
(normal)
Leaves fall
None
(normal)
Leaves fall
None
(normal)
Leaves fall
Suspended
Solids
None
None
None
None
None
Form
None
None
None
None
None
Oil Sheen
None
None
None
None
None
Others
None
None
None
None
None

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Best Management Practices
June 30, 2004
Best Management Practices (BMPs)
Best management practices (BMPs) include proper equipment design and operation,
manufacturing and material handling procedures, structural controls and landscaping
practices.
Spill Containment Structures: Containment structures are constructed of concrete and
concrete block. All containment structures are sized to hold the contents of the
largest tank plus accumulated rainwater. Each containment structure has the
maximum level for rainwater clearly marked such that the structure will still hold the
contents of the largest storage tank
• Drainage from Containment Areas: All containment areas have manually operated
valves or pumps, which remain closed and locked when not in operation. Drain
valves are on/off type - no flapper type valves are used. Accumulated stormwater is
inspected and inspection results are documented before stormwater is released. Only
trained personnel may inspect and release stormwater.
• Storage Tank Design and Installation: All storage tanks are constructed of materials
compatible with material stored and operating pressure and temperature. All storage
tanks have concrete secondary containment structures. All bulk storage tanks have
high level interlocks that will stop material transfer when tripped.
• Material Loadin nloading_ All bulk material handling is done in spill -contained
areas. Standard Operating Procedures are required for all bulk material handling
operations and checklists are used for each transfer. Only trained personnel are
permitted to load or unload material.
• Preventive maintenance: The Site's preventive maintenance program includes
inspections of bulk storage tanks, loading stations, transfer piping, spill containment
structures, high level alarms, and critical process equipment and instrumentation.
• Inspections: The site's Environment Health and Safety Team conducts weekly
inspections of the facility. Stormwater outfalls are inspected biannually.
• Personnel Training and_ Instruction: All process operators receive basic
environmental awareness and safety training before beginning specific process
training. A qualified operator must train all process operators before they are allowed

to operate any process alone. Corporate policy, requires standard operating
procedures (SOPs) for all process operations.
• Production Areas: All production operations are conducted in enclosed buildings.
Production buildings have concrete floors with no floor drains.
• Particulate Emission Control: All processes handling particulates have dust collectors
to control particulate emissions. All dust collectors are part of the Site's preventive
maintenance program.
• Housekeeping: Housekeeping inspections are conducted monthly by each production
building and quarterly by site management.
• Security: All buildings are locked and production and storage areas are completely
fenced.
• Erosion Prevention and Control: Parking areas are concrete and asphalt with the
exception of one small area near building 5. The remaining ground area is covered
with grass, shrubs and trees. Landscaping and contouring of the site grounds have been
utilized to minimize run-on of stormwater from non-production/storage areas into active
chemical usage and storage areas.

Dow Corning Corporation
Greensboro, North Carolina
Stormwater Permit NCS000077
Site Changes Summary
June 30, 2004
The following facility changes have occurred at the site:
• In 2000, a Mix/Blend operations in Building #5 was shutdown
In 2003, a Hot Melt Process was started up in Building # 3. This raw material for
this process are in 55-gallon drums and are stored in exiting containment
structures
Neither of these changes have impacted the site stormwater program.

STORMWATER POLLUTION PREVENTION PLAN
DEVELOPMENT- AND IMPLEMENTATION
CERTIFICATION
N.C..Division of Water Quality, Stormwater and General Permits Unit
Facility Name: DOW CORNING CORPORATION
Permit Number:. NCSOW077
Location Address: 2914 PATTERSON ST
GREENSBORO, NC 27407
County: GUILFORD
"I certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all'attachments
were developed and implemented under my direction or supervision in accordance with a system designed to assure
that qualified personnel properly gather and evaluate the information required by the SPPP. Based on my inquiry of
the person or persons who manage the system, or those persons directly responsible for gathering the information,
the information gathered is, to the best of my knowledge and belief, true, accurate, and complete"
11 certify that the SPPP has been developed, signed and retained at.the'facility location and the SPPP has been fully
implemented at the named facility location in accordance with the terms and conditions of the stormwater general
permit.".
"I am aware that there are significant penalties for falsifying information; including the possibility of fines and
imprisonment for knowing violations"
Sign (according to permit signatory requirements) and return this Certification. DO NOT SEND THE
STORMWATER POLLUTION PREVENTION PLAN WITH THE CERTIFICATION.
Signature Date �Y
GAC,,r"cr C �arrxs f ao�. �r<cHsra Sf�c /`t—�cr
Print or type name of person signing above Title
SPPP Certification 2/99

Michael F. Easley, Govemor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
February 27, 2007
Mr. Larry Tarvestad
Greensboro Site Manager
Dow Corning Corporation
2914 Patterson St
Greensboro, NC 27407
Subject: Draft Permit, NCS 000077
Dow Corning Corporation
Guilford County
Dear Mr. Tarvestad:
Alan W. Klimek, P.E., Director
Division of Water Quality
In response to your application received July 9, 2004 1 have enclosed a draft stormwater permit for your facility.
Please review the draft very carefully to ensure thorough understanding of the conditions and requirements it
contains.
The draft permit contains the following significant changes from this facility's current permit:
• Benchmarks for analytical monitoring have been added to this draft permit.
• All analytical monitoring has been changed to semi-annual.
• The flow reporting requirement has been removed per DWQ revised strategy. The total rainfall and event
duration parameters have been retained.
• You are required to collect all of the analytical monitoring sample's during representative storm events as
defined in this permit. Qualitative monitoring does not have to be performed during a representative
storm event.
Please submit any comments to this draft in writing no later than thirty (30) days following your receipt of this
letter. Comments should be sent to the address listed at the bottom of this page. If no adverse comments are
received from the public or from you, this permit will be issued in approximately two months.
If you have any questions or comments concerning this draft permit, contact me at [phone] x 376 or
[e-mail].
Sin erely,
Kelly o nson
Environmental Engineer
enc: Draft Permit
cc: Winston Salem Regional Office, Corey Basinger
Central Files
iSt6rmwater-Permitting Unit File
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617
Internet: h2o.enrstate.naus 512 N. Salisbury St, Raleigh, NC 27604
NonfiCarolina
Natmally
Phone [phone] Customer Service
FAX [phone]
An Equal QpportunitylAffirmative Action Employer — 50% Recycled/l0% Post Consumer Paper

Permit No. NCS000077
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT NO. NCS000077
TO DISCHARGE STORMWATER UNDER THE
NATIONAL POLLUTANT D
IN
In compliance with the provisions of North Carolina'General Statuted143-215.1, other lawful
standards and regulations promulgated and adopted by`he.North Carolina Environmental
Management Commission, and the Federal Water P,ollutian.Control Act, as amended,
Dow Cor`ninE"Co'rvoration
is hereby authorized to discharge stbrniwaterJrom a facility located at
291'4 Patterson Street
Greensboro, NC
Guilford County
to receiving waters designated as an unnamed tributary of South Buffalo Creek, a class C, NSW
stream in the Cape Fear River Basin, in accordance with the discharge limitations, monitoring
requirements, and other conditions set forth in Parts 1,11, III, IV, V and VI hereof.
This permit shall become effective Month Day, 2007.
This -permit and the authorization to discharge shall expire at midnight on Month Day, 2012.
Signed this day Month Day, 2007.
for Alan W. Klimek, P.E., Director
Division of Water Quality
By the Authority of the Environmental Management Commission

Permit No. NCS000077
PART I
Section A:
Section B:
Section C:
PART II
Section A:
Section B:
Section C:
Section D.
PART III
Section A:
Section B:
TABLE OF CONTENTS
INTRODUCTION
Individual Permit Coverage
Permitted Activities
Location Map
MONITORING, CONTROLS, AND
DISCHARGES
Stormwater Pollution Prevention
Analytical Monitoring Required(
4
R PERMITTED
Qualitative Monitoring Requirements
Sri
On -Site Vehicle Mainteriance Monitoring Requirements
STANDARD CONDITIONS
Compliance and Liability
1. Compliance Schedule
2. Duty to Comply
3. Duty to Mitigate
4. Civil and Criminal Liability
5. Oil and Hazardous. Substance Liability
6. Property Rights
7. Severability
8. Duty to Provide Information
9. Penalties for Tampering
10. Penalties for Falsification of Reports
General Conditions
1. Individual Permit Expiration
2. Transfers
i

Permit No. NCS000077
3. Signatory Requirements
4. Individual Permit Modification, Revocation and Reissuance, or
Termination
5. Permit Actions
Section C: Operation and Maintenance of Pollution Controls
1. Proper Operation and Maintenance
2. Need to Halt or Reduce Not a Defense
3. Bypassing of Stormwater Control Facilitie
Section D: Monitoring and Records
1. Representative Sampling
2. Recording Results
3. Flow Measurements
4. Test Procedures
5. Representative Outfall
6. RecordetenEion.
"\ Vic&
7. Inspection.and�Entry
Section E: Reporting Requirements
L . Discharge -Monitoring Reports
2. Submifti g Reports
3. Availability of Reports
4. Non-Stormwater Discharges
5. Planned Changes
6. Anticipated Noncompliance
7. Bypass,
S. Twenty-four Hour Reporting
9. Other Noncompliance
10. Other Information
PART IV LIMITATIONS REOPENER
PART V ADMINISTERING AND COMPLIANCE MONITORING FEE
REQUIREMENTS
PART VI DEFINITIONS
ft

Permit No. NCS000077
PART I INTRODUCTION
SECTION A: INDIVIDUAL PERMIT COVERAGE
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.
SECTION B: PERMITTED ACTIVITIES
Until this permit expires or is modified or revoked, the permittee`is authorized to discharge
stormwater to the surface waters of North Carolina or4separate.storm sewer system which has
been. adequately treated and managed in accordance with the terms,and conditions of this
individual permit. All discharges shall be in accordance with the o ditions of this permit.
Any other point source discharge to surface watersof-is prohibited unless it is an
allowable non-stormwater discharge or is covered by<another permit, authorization or approval.
rr ,rV
The discharges allowed by this individual perrnit4shall,not cause or contribute to. violations of
Water'Quality Standards.
This permit does not relieve the perinittt efrom responsibility for compliance with any other
applicable federal, state, or local Jaw die standard, ordinance, order, judgment, or decree.
Part I Page I of 2

SECTION C: LOCATION MAP Permit No. NCS000077
jP
mu nijuaKW.
01,
,ore
v,
21
4
MYn
L?
zjg- LVA-
4-1 move
jT' Dow Coming
Corporation
-Haut"
-A'
hkwoud
T' �171
P
7416
Latitude: 36'03'27" N
Longitude: 79'50'43" W NCS000077 Facility
County: Guilford Dow Corning Location
Stream Class: C, NSW Corporation
Receiving Stream: UT to Buffalo Creek
Sub -basin: 03-06-02 (Cape Fear River Basin) mratth 11 ICAL111:24,000.
Part I Pace 2 of 2

Permit No. NCS000077
PART II MONITORING, CONTROLS, AND LIMITATIONS FOR
PERMITTED DISCHARGES
SECTION A: STORMWATER POLLUTION PREVENTION PLAN
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 III, Standard
Conditions, Section E, Paragraph 3 of this individual permit. The Plan shall include, at a
minimum, the following items:
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 conW"'m the'lfollowiwing:
a. A general location ma USGS uadran e,ma or appropriately drafted
g P( q s p
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, (0if th� i ischarge is to a municipal separate
storm sewer system, the namelofthe municipality and the ultimate receiving
waters; and accurate latitude and longitude of the point(s) of discharge:
b. A narrative desc
outdoor process
waste diswsabi
C. A site map
(1)
(2)
(3)
(4)
(5)
practices, loading and unloading activities,
iculate generating or control processes, and
ztol 'cale with the following items:
Distance legend and north arrow
Location of industrial activities (including storage of materials,
disposal areas, process areas and loading and unloading areas)
Drainage structures
Delineated drainage areas for each outfall
Drainage area for each outfall in acres and percentage of
each drainage area that is impervious
(6) Building locations
- (7) Existing BMPs and impervious surfaces
(8) For each outfall, a narrative description of the potential pollutants that
could be expected to be present in the stormwater discharge.
d. A list of significant spills or leaks of pollutants that have occurred at the facility
during the 3 previous years and any corrective actions taken to mitigate spill
impacts.
e. 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 III, Standard Conditions, Section
B, Paragraph 3.
Part 11 Page 1 of 8

Permit No. NCS000077
2. 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:
a. 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.
fil— % \ A
b. Secondary Containment Schedule. A schedule to`pr vide 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,substances to prevent leaks and spills from
contaminating stormwater runoffIf the secondary containment devices are
connected directly to stormwater conveyance systems, the connection shall be
f>
controlled by manually activated�valves or other similar devices [which shall be
secured with a locking mechanism]lhd any stormwater that accumulates in the
containment area shalPbe at,.a minimum visually observed for color, foam, outfall
3 1 1 : 4.-
staining, visible sheensxand 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. Records
documenting �I &.individual making the observation, the description of the
accumulated storift ater and the date and time of the release shall be kept for a
period of five years.
C. BMP Summary. A narrative description shall be provided of Best Management'
Practices (BMPs) to be considered such as, but not limited to, oil and grease
separation, debris control, vegetative filter strips, infiltration and stormwater
detention or retention, where necessary. The need for structural BMPs shall be
based on the assessment of potential of sources to contribute significant quantities
of pollutants to stormwater discharges and data collected through monitoring of
stormwater discharges.
3. 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 team) responsible for implementing the
SPRP shall be identified. 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, a SPCC plan 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.
Part 11 Page 2 of 8

Permit No. NCS000077
4. Preventative Maintenance and Good Housekeeping Program. A preventative
maintenance program shall be developed. The program shall document schedules of
inspections and maintenance activities of stormwater control systems, plant equipment
and systems. Inspection of material handling areas and regular cleaning schedules of
these areas shall be incorporated into the program.
5. Employee Training. Training schedules shall be developed and training provided at a
minimum on an annual basis on proper spill response and cleanup procedures and
preventative maintenance activities for all personnel involved in 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.
6. Responsible Party. The Stormwater Pollution
position(s) responsible for the overall coordin;
revision to the Plan. Responsibilities for all 6
and position assignments provided. E
7. Plan Amendment. The permittee shall
design, construction, operation, or mai
potential for the discharge of pollutaf t
Prevention Plan shall be,reviewed and
;hall identify a specific
it, implementation, and
Plan shall be documented
Plan whenever there is a change in
iich has a significant effect on the
waters. The Stormwater Pollution
on an annual basis.
The Director may notify the�permltteerwhen the Plan does not meet one or more of the
/ c �"
minimum requirements of the perrriit. 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 III, Standard Conditio s Section B, Paragraph 3) to the Director that the changes
have been made.
8. Facility Inspection Program. Facilities are required to inspect all stormwater systems on
at least a semiannual schedule, once in the fall (September -November) and once in the
spring (April - June). The inspection and any subsequent maintenance activities
performed shall be documented, recording date and time of inspection, individual(s)
making the inspection and a narrative description of the facility's stormwater control
systems, plant equipment and systems. Records of these inspections shall be incorporated .
into the Stormwater Pollution Prevention Plan.
Stormwater discharge characteristic monitoring as required in Part II of this permit shall
be performed in addition to facility inspections.
9. Implementation. The permittee shall document all monitoring, measurements,
inspections and maintenance activities and training provided to employees, including the
log of the sampling data and of activities 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 his
authorized representative immediately upon request.
Part H Page 3 of 8

Permit No. NCS000077
SECTION B: ANALYTICAL MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the
permittee is authorized to discharge stormwater subject to the provisions of this permit.
Analytical monitoring of stormwater discharges shall be performed as specified below 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). The permittee shall complete the
minimum ten analytical samplings in accordance with the schedule specified below in Table 2.
Monitoring results shall be compared to the benchmark values infTable 3. The benchmark
values in Table 3 are not permit limits but should be used as guidelinesfor the permittee's
Stormwater Pollution Prevention Plan (SPPP).. The permittee slall'evaluate the sources of any
benchmark exceedances and evaluate the effectiveness of any site BMPs. The permittee shall
review and/or update the SPPP and document any efforts two address stormwater contamination.
Table 1. Analytical Monitoring Require
Discharge =,
Character=isfics `-
Unit's
Measurement Frequency .
. _
Sample
T e2.
-
Sample
L'ocation3`
Total Sus ended Solids
m /L�
` Semi-annually
Grab _
SDO
Oil and Grease 4
m L;"!'
> Semi-annually
Grab
SDO
H A
standard
Semi-annually
Grab
SDO
Total Nitrogen (TN) `
:aft /L
Semi-annuall
Grab
SDO
Total Phosphorus (TP)
m
Semi-annually
Grab
SDO
Turbidity
NTU
Semi-annually
Grab
SDO
Total Rainfall
inches
Semi -Annually-
-
Rainfall Event Duration
I minutes
I Semi -Annually
-
-
Footnotes:
I Measurement Frequency: All analytical monitoring will be performed twice per year, once in the spring (April -
June) and once in the fall (September - November). See Table 2 for schedule of monitoring periods.
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. If the detention pond discharges only in response
to a storm event exceeding a ten year design storm, then no analytical monitoring is required and only qualitative.
monitoring shall be performed.
3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) unless representative
outfall status has been granted.
Part II Page 4 of 8

Permit No. NCS000077
Table 2. , Monitoring Schedule
Monttoring period
Saniile Number;
F StartEnd
_ .
Year 1 — Spring
1
April 1, 2007
June 30, 2007
Year 1 —Fall
2
September 1, 2007
November 30, 2007
Year 2 — Spring
3
April 1, 2008
June 30, 2008
Year 2 — Fall
4
September 1, 2008 _
November 30, 2008
Year 3 — Spring
5
April 1, 2,909,E
June 30, 2009
Year 3 — Fal l
6
Septeni er 1- �2009
November 3 0, 2009
Year 4 —Spring
7
April 1'�'2016'
June 30, 2010
Year 4 — Fall
8
Septei ibi rq, 2010
November 30, 2010
Year 5 — Spring
9
_April 12pP
June 30, 2011
Year 5 - Fall
10
A58pjeinberi 2011
November 30, 2011
Footnote-
1 Maintain semi-annual monitoring during permit,renewa. I rocess.
Table 3. Benchmark ValuesAt Analytical Monitoring-
_.
rDscharge Characferistics , •
y nits~
Ll '
-
;, .; ,`„ _Benchmark „ ,
Total Suspended Solids ,
mg/L
100
Oil and Grease
;.. m
30
pH
standard
6-9
Total Nitrogen (TN)
mg/L
30
Total Phosphorus (TP)
mg/L
2
Turbidity
NTU
50
This site discharges to impaired waters experiencing problems with impaired biological integrity
and turbidity. If a Total Maximum Daily Load (TMDL) is approved for this segment of South
Buffalo Creek, the Permittee may be required to monitor for the pollutant(s) of concern in the
future and submit results to the Division of Water Quality. The Division will consider the
monitoring results in determining whether additional BMPs are needed to control the pollutant(s)
of concern to the maximum extent practicable.
If additional BMPs are needed to achieve the required level of control, 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.
Part lI Page 5 of 8

Permit No. NCS000077
SECTION C: QUALITATIVE MONITORING REQUIREMENTS
Qualitative monitoring requires a visual inspection of each stormwater outfall regardless of
representative outfall status and shall be performed as specified below in Table 4. Qualitative
monitoring is for the purpose of evaluating the effectiveness of the Stormwater Pollution
Prevention Plan (SPPP) and assessing new sources of stormwater pollution. No analytical tests
are required. Qualitative monitoring of stortwater outfalls is performed when stormwater
discharge occurs but does not need to be performed during a representative storm event.
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 Stormwater Pollution Prevention
Plan.
All qualitative monitoring will be performed twice pe'r` year once in -le spring (April - June) and
once in the fall (September - November). 11,
�-�
Table 4. Qualitative Monitoriin ;Re uirements
Discharge Characteristics
_
Frequency_
- =
Monitoring;
Location_ -
Color n /
�eSemt-Annual
SDO
Odor ����.<.�.
�. Semi -Annual
SDO
Clarity
Semi -Annual
SDO
Floating Solids
Semi -Annual
SDO
Suspended Solids/
Semi -Annual
SDO
Foam
Semi -Annual
SDO
Oil Sheen
Semi -Annual
SDO
Other obvious indicators
of stotmwater pollution
Semi -Annual
SDO
Footnotes:
I Monitoring Location: Qualitative monitoring shall be performed at each stormwater discharge outfall (SDO)
regardless of representative outfall status.
SECTION D: ON -SITE VEHICLE MAINTENANCE MONITORING REQUIREMENTS
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
outfalls which discharge stormwater runoff from vehicle maintenance areas.
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) which discharges stonnwater runoff from
PartI I Page 6 of 8

Permit No. NCS000077
vehicle maintenance areas. The permittee shall complete the minimum ten analytical samplings
in accordance with the schedule specified in Table 2 (Section B).
Monitoring results shall be compared to the benchmark values in Table 6. The benclutiark
values in Table 6 are not permit limits but should be used as guidelines for the permittee's
Stormwater Pollution Prevention Plan (SPPP). The permittee shall evaluate the sources of any
benchmark exceedances and evaluate the effectiveness of any site BMPs.. The permittee shall
review and/or update the SPPP and document any efforts to address stormwater contamination.
Table 5. Analytical Monitoring Requirements for On -Site Vehicle Maintenance
Discharge;Charactertst�cs
Units ''
';Measurement
`` Satr'ple
Sample
Fre' uenc r
' Type "? ., :.
Locatio .
H
standard
Semi-annual
.ly,
C-�.....
Grab
SDO
Oil and Grease
mg/1
rx
Semi-aiuivallyr 1.
Grab
SDO
Total suspended Solids
mg/1
Semi-annually
Grab
SDO
New Motor Oil Usagegallons/month
Semi-annually
Estimate
-
Total Rainfall
inchesSem`-annually
Rainfall Event Duration
minutes
zSemannually
Footnotes.
Measurement Frequency: All analyttcal monitoring will be performed twice per year, once in the spring (April -
June) and once in the fall (September,'Novembery;See Table 2 (Section B) for schedule of monitoring periods.
2 If the stormwater runoff is controlled by a st6rrnwater detention pond, a grab sample of the discharge from the
pond shall be collected within tbie first 30,minutes of discharge. If the detention pond discharges only in response
to a storm event exceedinga ten, e� desi storm then no analytical monitoring is required and only qualitative
YP� Yt � g q Y
monitoring shall be performed.
3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) that discharges
stormwater runoff from area(s) where vehicle maintenance activities occur.
Table 6. Benchmark Values for Vehicle Maintenance AnaIvtical Moni
'L11J1d1UFgr 1.,11ilrill:LCII�LlC, _1JI11LJ -',F a`:-DC11l;I1I11dl"K '.r, "'
Total Suspended Solids mg/L 100
Oil and Grease mg/L 30
pH standard 6-9
toring
Part II Page 7 of 8

Permit No. NCSOOOXXX
PART III STANDARD CONDITIONS FOR NPDES STORMWATER INDIVIDUAL PERMITS
SECTION A: COMPLIANCE AND LIABILITY
1. Compliance Schedule
The permittee shall comply with Limitations and Controls specified for stormwater discharges in
accordance with the following schedule:
Existing Facilities: The Stormwater Pollution Prevention Plan shall be developed and implemented within
12 months of the effective date of the initial permit and updated thereafter on an annual basis. Secondary
containment, as specified in Part 11, Section A, Paragraph 2(b) of this permit, shall be accomplished within
12 months of the effective date of the initial permit issuance.
Proposed Facilities: The Stormwater Pollution Prevention Plan shall be developed and implemented prior to
the beginning of discharges from the operation of the industrial activity and be updated thereafter on an
annual basis. Secondary containment, as specified in Part II, Section A, Paragraph 2(b) of this permit shall
be accomplished prior to the beginning of discharges from the operation of the industrial activity.
2. Duly to Comply
The permittee must comply with all conditions of this individual permit. Any permit noncompliance
constitutes a violation of the Clean Water Act and is grounds for enforcement action; for permit
termination, revocation and reissuance, or modification; or denial of a permit upon renewal application.
a. The permittee shall comply with standards or prohibitions established under section 307(a) of the
Clean Water Act for toxic pollutants within the time provided in the regulations that establish these
standards or prohibitions, even if the permit has not yet been modified to incorporate the
requirement.
b. The Clean Water Act provides that any person who violates a permit condition is subject to a civil
penalty not to exceed $27,500 per day for each violation. Any person who negligently violates any
permit condition is subject to criminal penalties of $2,500 to $25,000 per day of violation, or
imprisonment for not more than 1 year, or both. Any person who knowingly violates permit
conditions is subject to criminal penalties of $5,000 to $50,000 per day of violation, or
imprisonment for not more than 3 years, or both. Also, any person who violates a permit condition
may be assessed an administrative penalty not to exceed $11,000 per violation with the maximum
amount not to exceed $137,500. [Ref Section 309 of the Federal Act 33 USC 1319 and 40 CFR
122.41(a).]
Under state law, a daily civil penalty of not more than twenty-five thousand dollars ($25,000) per
violation may be assessed against any person who violates or fails to act in accordance with the
terms, conditions, or requirements of a permit. [Ref: North Carolina General Statutes 143-
215.6A]
d. Any person may be assessed an administrative penalty by the Director for violating section 301,
302, 306, 307, 308, 318, or 405 of the Act, or any permit condition or limitation implementing any
of such sections in a permit issued under section 402 of the Act. Administrative penalties for Class
I violations are not to exceed $11,000 per violation, with the maximum amount of any Class I
penalty assessed not to exceed $27,500, Penalties for Class lI violations are not to exceed $11,000
per day for each day during which the violation continues, with the maximum amount of any Class
I1 penalty not to exceed $137,500.
Part III Page 1 of 8 Pages

Permit No. NCSOOOXXX
3. Duty tom
The permittee shall take all reasonable steps to minimize or prevent any discharge in violation of this
individual permit which has a reasonable likelihood of adversely affecting human health or the environment.
Civil and Criminal Liability
Except as provided in Part III, Section C of this permit regarding bypassing of stormwater control facilities,
nothing in this individual permit shall be construed to relieve the permittee from any responsibilities,
liabilities, or penalties for noncompliance pursuant to NCGS 143-215.3,143-215.6A, 143-215.613, 143-
215.6C or Section 309 of the Federal Act, 33 USC 1319. Furthermore, the permittee is responsible for
consequential damages, such as fish kills, even though the responsibility for effective compliance may be
temporarily suspended.
5. Oil and Hazardous Substance Liability
Nothing in this individual permit shall be construed to preclude the institution of any legal action or relieve
the permittee from any responsibilities, liabilities, or penalties to which the permittee is or may be subject to
under NCGS 143-215.75 et seq. or Section 311 of the Federal Act, 33 USC 1321.
6. Property Rights
The issuance of this individual permit does not convey any property rights in either real or personal
property, or any exclusive privileges, nor does it authorize any injury to private property or any invasion of
personal rights, nor any infringement of Federal, State or local laws or regulations.
7. Severability
The provisions of this individual permit are severable, and if any provision of this individual permit, or the
application of any provision of this individual permit to any circumstances, is held invalid, the application
of such provision to other circumstances, and the remainder of this individual permit, shall not be affected
thereby.
8. Duty to Provide Information
The permittee shall furnish to the Director, within a reasonable time, any information which the Director
may request to determine whether cause exists for modifying, revoking and reissuing, or terminating the
permit issued pursuant to this individual permit or to determine compliance with this individual permit. The
permittee shall also furnish to the Director upon request, copies of records required to be kept by this
individual permit.
9. Penalties for Tampering
The Clean Water Act provides that any person who falsifies, tampers with, or knowingly renders inaccurate,
any monitoring device or method required to be maintained under this individual permit shall, upon
conviction, be punished by a fine of not more than $10,000 per violation, or by imprisonment for not more
than two years per violation, or by both. If a conviction of a person is for a violation committed after a first
conviction of such person under this paragraph, punishment is a fine of not more that $20,000 per day of
violation, or by imprisonment of not more than 4 years, or both.
10. Penalties for Falsification of Reports
The Clean Water Act provides that any person who knowingly makes any false statement, representation, or
certification in any record or other document submitted or required to be maintained under this individual
PartIll Page 2 of 8 Pages

Permit No. NCSOOOXXX
permit, including monitoring reports or reports of compliance or noncompliance shall, upon conviction, be
punished by a fine.of not more than $10,000 per violation, or by imprisonment for not more than two years
per violation, or by both.
SECTION B: GENERAL CONDITIONS
Individual Permit Exoiration
The permittee is not authorized to discharge after the expiration date. In order to receive automatic
authorization to discharge beyond the expiration date, the permittee shall submit forms and fees as are
required by the agency authorized to issue permits no later than 180 days prior to the expiration date. Any
permittee that has not requested renewal at least 180 days prior to expiration, or any pennittee that does not
have a*permit alter the expiration and has not requested renewal at least 180 days prior to expiration, will be
subjected to enforcement procedures as provided in NCGS § 143-2I53.6 and 33 USC 1251 et. seq.
Transfers
This permit is not transferable to any person except after notice to and approval by the Director. The
Director may require modification or revocation and reissuance of the permit to change the name and
incorporate such other requirements as may be necessary under the Clean Water Act. Petmittee is required
to notify the Division in writing inthe event the permitted facility is sold or closed.
SiQnatory Reauirements
All applications, reports, or information submitted to the Director shall be signed and certified.
a. All applications to be covered under this individual permit shall be signed as follows:
(1) For a corporation: by a responsible corporate officer. For the purpose of this Section, a
responsible corporate officer means: (a) a president, secretary, treasurer or vice president
of the corporation in charge of a principal business function, or any other person who
performs similar policy or decision making functions for the corporation, or (b) the
manager of one or more manufacturing production or operating facilities employing more
than 250 persons or having gross annual sales or expenditures exceeding 25 million (in
second quarter 1980 dollars), if authority to sign documents has been assigned or
delegated to the manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship: by a general partner or the proprietor,
respectively; or
(3) For a municipality, State, Federal, or other public agency: by either a principal executive
officer or ranking elected official.
b. All reports required by the individual permit and other information requested by the Director shall
be signed by a person described above or by a duly authorized representative of that person. A
person is a duly authorized representative only if:
(1) The authorization is made in writing by a person described above;
(2) The authorization specified either an individual or a position having responsibility for the
overall operation of the regulated facility or activity, such as the position of plant
manager, operator of a well or well field, superintendent, a position of equivalent
responsibility, or an individual or position having overall responsibility for environmental
PartI II Page 3.of 8 Pages

Permit No. NCSOOOXXX
matters for the company. (A duly authorized representative may thus be either a named
individual or any individual occupying a named position.); and
(3) The written authorization is submitted to the Director.
Any person signing a document under paragraphs a. or b. of this section shall make the following
certification:
"I certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
Individual Permit Modification, Revocation and Reissuance, or Termination
The issuance of this individual permit does not prohibit the Director from reopening and modifying the
individual permit; revoking and reissuing the individual permit, or terminating the individual permit as
allowed by the laws, rules, and regulations contained in Title 40, Code of Federal Regulations, Parts 122
and 123; Title 15A of the North Carolina Administrative Code, Subchapter 2H .0100; and North Carolina
General Statute.143-215.1 et. al.
Permit Actions
The permit may be modified, revoked and reissued, or terminated for cause. The notification of planned
changes or anticipated noncompliance does not stay any individual permit condition.
SECTION C: OPERATION AND MAINTENANCE OF POLLUTION CONTROLS
Proper Operation and Maintenance
The permittee shall at all times properly operate and maintain all facilities and systems of treatment and
control (and related appurtenances) which are installed or used by the permittee to achieve compliance with
the conditions of this individual permit. Proper operation and maintenance also includes adequate
laboratory controls and appropriate quality assurance procedures. This provision requires the operation of
back-up or auxiliary facilities or similar systems which are installed by a permittee only when the operation
is necessary to achieve compliance with the conditions of this individual permit.
2. Need to Halt or Reduce Not a Defense
It shall not be a defense for a permittee in an enforcement action that it would have been necessary to halt or
reduce the permitted activity in order to maintain compliance with the condition of this individual permit.
3. Bypassing of Stormwater Control Facilities
Bypass is prohibited and the Director may take enforcement action against a permittee for bypass unless:
Bypass was unavoidable to prevent loss of life, personal injury or severe property damage; and
b. There were no feasible alternatives to the bypass, such as the use of auxiliary control facilities,
retention of stormwater or maintenance during normal periods of equipment downtime or dry
PartI II Page 4 of 8 Pages

Permit No. NCSOOOXXX
weather. This condition is not satisfied if adequate backup controls should have been installed in
the exercise of reasonable engineering judgment to prevent a bypass which occurred during normal
periods of equipment downtime or preventive maintenance; and
The permittee submitted notices as required under, Part I11, Section E of this permit.
If the Director determines that it will meet the three conditions listed above, the Director may approve an
anticipated bypass after considering its adverse effects.
SECTION D: MONITORING AND RECORDS
Representative Sampling
Samples collected and measurements taken, as required herein, shall be characteristic of the volume and
nature of the permitted discharge. Analytical sampling shall be performed during a representative storm
event. Samples shall be taken on a day and time that is characteristic of the discharge. Ail samples shall be
taken before the discharge joins or is diluted by any other waste stream, body of water, or substance.
Monitoring points as specified in this permit shall not be changed without notification to and approval of
the Director.
2. Recording Results
For each measurement, sample, inspection or maintenance activity performed or collected pursuant to the
requirements of this individual permit, the permittee shall record the following information:
a. The date, exact place, and time of sampling, measurements, inspection or maintenance activity;
b. ,The individual(s) who performed the sampling, measurements, inspection or maintenance activity;
C. The date(s) analyses were performed;
d. The individual(s) who performed the analyses;
The analytical techniques or methods used; and
The results of such analyses.
Flow Measurements
Where required, appropriate flow measurement devices and methods consistent with accepted scientific
practices shall be selected and used to ensure the accuracy and reliability of measurements of the voluthe of
monitored discharges.
4. . Test Procedures
Test procedures for the analysis of pollutants shall conform to the EMC regulations published pursuant to
NCGS 143-215.63 et. seq, the Water and Air Quality Reporting Acts, and to regulations published pursuant
to Section 304(g), 33 USC 1314, of the Federal Water Pollution Control Act, as Amended, and Regulation
40 CFR 136.
To meet the intent of the monitoring required by this individual permit, all test procedures must produce
minimum detection and reporting levels and all data generated must be reported down to the minimum
detection or lower reporting level of the procedure.
Part I l l Page 5 of S Pages

Permit No. NCSOOOXXX
5. Representative Outfall
If a facility has multiple discharge locations with substantially identical stormwater discharges that are
required to be sampled, the permittee may petition the Director for representative outfall status. If it is
established that the stormwater discharges are substantially identical and the permittee is granted
representative outfall status, then sampling requirements may be performed at a reduced number of outfalls.
6. Records Retention
Visual monitoring shall be documented and records maintained at the facility along with the Stormwater
Pollution Prevention Plan. Copies of analytical monitoring results shall also be maintained on -site. The
permittee shall retain records of all monitoring information, including all calibration and maintenance
records and all original strip chart recordings for continuous monitoring instrumentation, and copies of all.
reports required by this individual permit for a period of at least 5 years from the date of the sample,
measurement, report or application. This period may be extended by request of the Director at any time.
Insnection and En
The permittee shall allow the Director, or an authorized representative (including an authorized contractor
acting as a representative of the Director), or in the case of a facility which discharges through a municipal
separate storm sewer system, an authorized representative of a municipal operator or the separate storm
sewer system receiving the discharge, upon the presentation of credentials and other documents as may be
required by law, to;
a. Enter upon the permittee's premises where a regulated facility or activity is located or conducted,
or where records must be kept under the conditions of this individual permit;
b. Have access to and copy, at reasonable times, any records that must be kept under the conditions of
this individual permit;
C. Inspect at reasonable times any facilities, equipment (including monitoring and control equipment),
practices, or operations regulated or required under this individual permit; and
d. Sample or monitor at reasonable times, for the purposes of assuring individual permit compliance
or as otherwise authorized by the Clean Water Act, any substances or parameters at any location.
SECTION E: REPORTING REQUIREMENTS
I. Discharge Monitoring Reports
Samples analyzed in accordance with the terms of this permit shall be submitted to the Division on
Discharge Monitoring Report forms provided by the Director. Submittals shall be received by the Division
no later than 30 days from the date the facility receives the sampling results from the laboratory.
2. Submitting Reports
Duplicate signed copies of all reports required herein, shall be submitted to the following address:
Division of Water Quality
Water Quality Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
PartI ll Page 6 of 8 Pages

Permit No. NCSOOOXXX
Availability of Reports
Except for data determined to be confidential under NCGS 143-215.3(a)(2) or Section 308 of the Federal
Act, 33 USC 1318, all reports prepared in accordance with the terms shall be available for public inspection
at the offices of the Division of Water Quality. As required by the Act, analytical data shall not be
considered confidential. Knowingly making any false statement on any such report may result -in the
imposition of criminal penalties as provided for in NCGS 143-215.6B or in Section 309 of the Federal Act.
4. Non-Stormwater Discharges
If the storm event monitored in accordance with this individual permit coincides with a non-stormwater
discharge, the permittee shall separately monitor all parameters as required under the non-stormwater
discharge permit and provide this information with the stonnwater discharge monitoring report.
5. Planned Changes
The permittee shall give notice to the Director as soon as possible of any planned changes at the permitted
facility which could significantly alter the nature or quantity of pollutants discharged. This notification
requirement includes pollutants which are not specifically listed in the individual permit or subject to
notification requirements under 40 CFR Part 122.42 (a).
6. Anticipated Noncompliance
The permittee shall give notice to the Director as soon as possible of any planned changes at the permitted
facility which may result in noncompliance with the individual permit requirements.
7. . Bynass
a. Anticipated bypass. If the permittee knows in advance of the need for a bypass, it shall submit
prior notice, if possible at least ten days before the date of the bypass; including an evaluation of
the anticipated quality and affect of the bypass.
b. Unanticipated bypass. The permittee shall submit notice within 24 hours of becoming aware of an
unanticipated bypass.
Twenty-four Hour Reporting
The permittee shall report to the central office or the appropriate regional office any noncompliance which
may endanger health or the environment. Any information shall be provided orally within 24 hours from
the time the permittee became aware of the circumstances. A written submission shall also be provided
within 5 days of the time the permittee becomes aware of the circumstances.
The written submission shall contain a description of the noncompliance, and its causes; the period of
noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the
anticipated time compliance is expected to continue; and steps taken or planned to reduce, eliminate, and
prevent reoccurrence of the noncompliance.
The Director may waive the written report on a case -by -case basis if the oral report has been received
within 24 hours.
Other Noncompliance
The permittee shall report all instances of noncompliance not reported under 24 hour reporting at the time
monitoring reports are submitted.
Part I I I Page 7 of 8 Pages

Permit No. NCSOOOXXX
10. Other Information
Where the permittee becomes aware that it failed to submit any relevant facts in an application for an
individual permit or in any report to the Director, it shall promptly submit such facts or information,
Part III Page 8 of 8 Pages

Permit No. NCSOOOXXX
PART IV LIMITATIONS REOPENER
This individual permit shall be modified or alternatively, revoked and reissued, to comply with any applicable
effluent guideline or water quality standard issued or approved under Sections 302(b) (2) (c), and (d), 304(b) (2) and
307(a) of the Clean Water Act, if the effluent guideline or water quality standard so issued or approved:
a. Contains different conditions or is otherwise more stringent than any effluent limitation in the individual
permit; or
b. Controls any pollutant not limited in the individual permit.
The individual permit as modified or reissued under this paragraph shall also contain any other requirements in the
Act then applicable.
PART V ADMINISTERING AND COMPLIANCE MONITORING FEE
REQUIREMENTS
The permittee must pay the administering and compliance monitoring fee within 30 (thirty) days after being billed by
the Division. Failure to pay the fee in timely manner in accordance with 15A NCAC 2H .0105(b)(4) may cause this
Division to initiate action to revoke the Individual Permit.
PART VI DEFINITIONS
1. Act
See Clean Water Act.
2. Arithmetic Mean
The arithmetic mean of any set of values is the summation of the individual values divided by the number of
individual values.
3. Allowable Non-Stormwater Discharges
This permit regulates stormwater discharges. Nan-stormwater discharges which shall be allowed in the
stormwater conveyance system are:
(a) All other discharges that are authorized by a non-stormwater NPDES permit.
(b) Uncontaminated groundwater, foundation drains, air -conditioner condensate without added
chemicals, springs, discharges of uncontaminated potable water, waterline and fire hydrant
flushings, water from footing drains, flows from riparian habitats and wetlands.
(c) Discharges resulting from fire -fighting or fire -fighting training.
4. Best Mana ement Practices BMPs
Measures or practices used to reduce the amount of pollution entering surface waters. BMPs may take the
form of a process, activity, or physical structure.
Parts IV, V and VI Page 1 of 5

Permit No. NCSOOOXXX
5. Bypass
A bypass is the known diversion of stormwater from any portion of a stormwater control facility including
the collection system, which is not a designed or established operating mode for the facility.
6.. Bulk Storage of Liquid Products
Liquid raw materials, manufactured products, waste materials or by-products with a single above ground
storage container having a capacity of greater than 660 gallons or with multiple above ground storage
containers located in close proximity to each other having a total combined storage capacity of greater than
1,320 gallons.
7. Clean Water Act
The Federal Water Pollution Control Act, also known as the Clean Water Act (CWA), as amended, 33
USC 1251, et. seq.
8. Division or DWO
The Division of Water Quality, Department of Environment and Natural Resources,
9. Director
The Director of the Division of Water Quality, the permit issuing authority.
10. EMC
The North Carolina Environmental Management Commission.
11. Grab Sample
An individual sample collected instantaneously. Grab samples that will be directly analyzed or qualitatively
monitored must be taken within the first 30 minutes of discharge.
12. Hazardous Substance
Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the CIean Water Act.
13. Landfill
A disposal facility or part of a disposal facility where waste is placed in or on land and which is not a land
treatment facility, a surface impoundment, an injection well, a hazardous waste long-term storage facility or
a surface storage facility.
14. Municipal Separate Storm Sewer System
A stormwater collection system within an incorporated area of local self-government such as a city or town.
15. Overburden
Any material of any nature, consolidated or unconsolidated, that overlies a mineral deposit, excluding
topsoil or similar naturally -occurring surface materials that are not disturbed by mining operations.
Part VI Page 2 of 5 Pages

Permit No. NCSOOOXXX
16. Permittee
The owner or operator issued a permit pursuant to this individual permit.
17. Point Source Discharge of Stormwater
Any discernible, confined and discrete conveyance including, but not specifically limited to, any pipe, ditch,
channel, tunnel, conduit, well, or discrete fissure from which stormwater is or may be discharged to waters
of the state.
18. 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.
19, Representative Outfall Status
When it is established that the discharge of stormwater runoff from a single outfall is representative of the
discharges at multiple outfalls, the DWQ may grant representative outfall status. Representative outfall
status allows the permittee to perform analytical monitoring at a reduced number of outfalls.
20. Rinse Water Discharge
The discharge of rinse water from equipment cleaning areas associated with industrial activity. Rinse
waters from vehicle and equipment cleaning areas are process wastewaters and do not include washwaters
utilizing any type of detergent or cleaning agent.
21. Secondary Containment
Spill containment for the contents of the single largest tank within the containment structure plus sufficient
freeboard to allow for the 25-year, 24-hour storm event.
22. Section 313 Water Priority Chemical
A chemical or chemical category which:
a. Is listed in 40 CFR 372.65 pursuant to Section 313 of Title III of the Superfund Amendments and
Reauthorization Act (SARA) of 1986, also titled the Emergency Planning and Community Right -
to -Know Act of 1986;
b. Is present at or above threshold levels at a facility subject to SARA title 111, Section 313 reporting
requirements; and
C. That meet at least one of the following criteria:
(1) Is listed in Appendix D of 40 CFR part 122 on either Table 11 (organic priority
pollutants), Table III (certain metals, cyanides, and phenols) or Table IV (certain toxic
pollutants and hazardous substances);
(2) Is listed as a hazardous substance pursuant to section 311(b)(2)(A) of the CWA at 40
CFR 116.4; or
(3) Is a pollutant for which EPA has published acute or chronic water quality criteria.
Part VI Page 3 of 5 Pages

Permit No, NCSOOOXXX
23. Severe Property Damage
Means substantial physical damage to property, damage to the control facilities which causes them to
become inoperable, or substantial and permanent loss of natural'resources which can reasonably be
expected to occur in the absence of a bypass. Severe property damage does not mean economic loss
caused by delays in production.
24. Significant Materials
Includes, but is not limited to: raw materials; fuels; materials such as solvents, detergents, and plastic
pellets; finished materials such as metallic products; raw materials used in food processing or production;
hazardous substances designated under section 101(14) ofCERCLA; any chemical the facility is required to
report pursuant to section 313 of Title III of SARA; fertilizers; pesticides; and waste products such as ashes,
slag and sludge that have the potential to be released with stormwater discharges.
25. Significant Spills
Includes, but is not limited to: releases of oil or hazardous substances in excess of reportable quantities
under section 311 of the Clean Water Act (Ref 40 CFR 110.10 and CFR 117.21) or section 102 of
CERCLA (Ref. 40 CFR 302.4).
26. Stormwater Runoff
The flow of water which results from precipitation and which occurs immediately following rainfall or as a
result of snowmelt.
27. Stormwater Associated with Industrial Activity
The discharge from any point source which is used for collecting and conveying stormwater and which is
directly related to manufacturing, processing or raw material storage areas at an industrial site. Facilities
considered to be engaged in "industrial activities" include those activities defined in 40 CFR 122.26(b)(14).
The term does not include discharges from facilities or activities excluded from the NPDES program.
28. Stormwater Pollution Prevention Plan
A comprehensive site -specific plan which details measures and practices to reduce stormwater pollution and
is based on an evaluation of the pollution potential of the site.
29. 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.
30. Total Flow
The flow corresponding to the time period over which the entire storm event occurs. Total flow shall be
either; (a) measured continuously, (b) calculated based on the amount of area draining to the outfall, the
amount of built -upon (impervious) area, and the total amount of rainfall, or (c) estimated by the
measurement of flow at 20 minute intervals durin; the rainfall event.
Part V I Page 4 of 5 Pages

Permit No. NCSOOOXXX
31, Total Maximum Daily Load (TMDL)
A TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet
water quality standards, and an allocation of that amount to the pollutant's sources. A TMDL is a detailed
water quality assessment that provides the scientific foundation for an implementation plan. The
implementation plan outlines the steps necessary to reduce pollutant loads in a certain body of water to
restore and maintain water quality standards in all seasons. The Clean Water Act, section 303, establishes
the water quality standards and TMDL programs.
32. Toxic Pollutant
Any pollutant listed as toxic under Section 307(a)(1) of the Clean Water Act.
33. Upset
Means an exceptional incident in which there is unintentional and temporary noncompliance with
technology based permit effluent limitations because of factors beyond the reasonable control of the
permittee. An upset does not include noncompliance to the extent caused by operational error, improperly
designed treatment or control facilities, inadequate treatment or control facilities, lack of preventive
maintenance, or careless or improper operation. `
34. Vehicle Maintenance Activity
Vehicle rehabilitation, mechanical repairs, painting, fueling, lubrication, vehicle cleaning operations, or
airport deicing operations.
35. Visible Sedimentation
Solid particulate matter, both mineral and organic, that has been or is being transported by water, air,
gravity, or ice from its site of origin which can be seen with the unaided eye.
36. 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.
Part VI Page 5 of 5 Pages

4
NCS000077
&
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P.E. Dee Freeman
Governor Director Secretary
STAFF REVIEW AND EVALUATION
NPDES Stormwater Permit
Facility Name:
Dow Corning Corporation
i�TPDES Permit Number:
NCS000077
Facility Location:
2914 Patterson Street, Geensboro, NC (Guilford County)
Type of Activity:
Plastics Material and Resin Manufacturing
SIC Code:
2821
Receiving Streams:
See Figure t
River Basin:
Cape Fear River Basin, Sub -basin 03-06-02
Stream Classification:
WS-V, NSW
Proposed Permit Requirements:
See attached draft permit.
Monitoring Data:
See Table 1
Response Requested by (Date):
April 30, 2012
Central Office Staff Contact:
Return to: Jennifer Jones, [phone]
Special Issues:
Issue
Rating Scale: I(easy) to 10(hard)
Compliance history
3
Benchmark exeeedance
3
Location (TMDL, T&E
species, etc)
3
Other Challenges:
3
Difficult Rating:
12140
Special Issues Erplanation:
1. It is unclear as to what Representative outfall status the permittee holds and what future representative
outfall status the permittee would like to obtain with their new facility configuration. RO: Please ask the
permittee to detail this and request or produce a request of their representative outfall status letter. jI have
requested information from the permittee but have not heard back as of yet, so am continuing forward].
2. It appears from the TRI that there are many organic chemicals onsite including Toluene and Xylene. RO:
Does the Regional office feel it may be necessary for the permittee to sample BOD and COD (based on a
site evaluation)? e.g. depending on what types of containers and exposure are at each outfall.
3. RO: During your site visit, please obtain copies of sample results for years 2007-2010, and any for 2012 as
we do not have copies of these, and send them to Central Office. [I have requested information from the
permittee but have not heard back as of yet, so am continuing forward].
Page 1 of 10

a5zt;.
Ty ,
WV 1 AT 40 WNWITEV:

NCsoon077
Description of Onsite Activities:
• Plastics Material and Resin Manufacturing
Documents Reviewed:
• NPDES Storinwatcr Pcrrrl:t Application 111iaterlals
• National Heritage Program (NHP) Threatened and Endangered Species Database
• SPU File
• Central Files
• EPA Sector -Specific Permit, 2008
• 303(d) List: 2010 final, 2012 draft
History:
• Date permit first issued: 8/31/1994
• Date permit re -issued: April 27, 2007
• Date permittee submitted renewal application: October 5, 2011
• Other dates: Last renewed permit expires on April 26, 2012.
• August 31, 1994: Letter containing a permit effective October 1, 1994 until August 31, 1999.
• December 10, 1999: Letter containing a permit effective January 1, 2000 until December 31, 2004.
• July 9, 2004: Division received the permit application.
• December 3, 2004: Division acknowledged receipt of the permit application.
Central Office Review Summary:
1. Owner's Other Permits:
Statute'
stem;
Source ID
facility Name
Street Address Clty
State
Zip
FRS
110000346634
DOW CORNING CORP
12914 PATTERSON ST. GREENSBORO
NC
�27407
CAA
AFS
3708100239
DO_W CORNING CORPORATION
2914 PATTERSON STREET GREENSBORO
NC
27407
-,CAA
NEI
NEi45903 �DOW
CORNING CORP
NC
27407
P
PCS
NCS000077
D'o7 ruing Corporation
914 Patterson St GREENSBORO CITY
NC
7407PCS
INCO088773
Dow Corning Corp Greensboro Re
2914 Patterson S1 REENSBORO CITY
NC
27407
RCRA
RCR NCo003221546
DOW CORNING CORPORATION
L2914 PATTERSON ST SGREENSBORO
NC
NC
27407
7407
EP3i3
RI 27407DWCRN2914P
DOW CORNING CORP
2914 PATTERSON ST GREENSBORO
I!
Information
Information Svstem�I
S s m
{ I D
al Interest Last suoolemental Environmental
Tyae Data Source �pl�e� Interests•
AIR FACILITY AIR SYNTHETIC MINOR u
SYSTEM 3708100239 (ACTIVE) AIRS/AFS 02/02/2012 �—
BIENNIAL HAZARDOUS WASTE
REPORTERS NCDO03221546 RCRAINFO 12/31/2009
BIENNIAL REPORTER
EMI5510N
INVENTORY CRITERIA AND HAZARDOUS
SYSTEM (EIS} 8285811 I AIR POLLUTANT INVENTORY EIS
INTEGRATED 1
COMPLIANCE 2657083 FORMAL ENFORCEMENT ICIS 11/01/2002 ICIS-04-2002-9974
INFORMATION ACTION FORMAL ENFORCEMENT ACTION
SYSTEM
iNTEGRATEQ �
COMPLIANCE -ENFORCEMENT/COMPLIANCE ICIS-04-2002-9974
INFORMATION 2657083 ACTIVITY ICIS [11/O1/2002 'FORMAL ENFORCEMENT ACTION
SYSTEM j
Page 3 of 10

NCS000077
NORTH
CAROLINA —
FACILITY
IDENTIFICATION
TEMPLATE FOR
STATES
-0-017529
UNDERGROUND STORAGE TANK
PROGRAM
4486 STATE MASTER NC -FITS
NATIONAL,:: --- -- -- --- -
EMISSIONS CRITERIA AN
INVENTORYS NEI45903 AIR.-POLLUTA
115DA4YG00TXYW 64F8EQ8BVKH8
WASTEWATER FACILITY
-3919
AIR PROGRAM
D HAZARDOUS
NT INVENTORY
_ ----- — _— is
PERMIT
COMPLIANCE NCO088773 NPDES NON -MAJOR NPDES 10/21/2008
SYSTEM PERMIT
jPERMIT— -- -
C6)7mP0IANCE0 -`
'SYSTEM NCS000077 ,NPDES NON -MAJOR
RESOURCE
CONSERVATION
AND RECOVERY
ACT NCDO03221546 LQG (ACTIVE)
INFORMATION
SYSTEM
�fPCES L04- --- ----- — -
NOTIFICATION 10/19/2011
(RCRA)
RESOURCE
CA SERVATION
AN DTRVF RYr,_�
AC-T N -D 32 1546 �. - d ..•:TSD ACTIVE I NOTIFICATION; 10/19/2011 `�
-�_ C _00 2 ( ) (R , I ,
IN0RRMATION Y is
SYSTEM
TOXIC RELEASE TRI
INVENTORY 27407DWCRN2914P TRI REPORTER REPORTING 06/27/2011
SYSTEM FORM
2. General Observations: From Kelly Johnson in 2007 permit review: "This facility drains to NSW waters, and has
consistently been under the benchmark for nitrogen. Of the four samples for each of five outfalls, only one
phosphorus sample was over the benchmark, and not excessively above it. The permittee has had consistent TSS
exceedances at outfall number five. This may be due to the layout of the facility.
The site map shows that outfall number one is at the northern most part of the facility. This side of the
property borders an asphalt company. Outfall number one had one TSS exceedance. Outfall number one
drains to the collection point of outfall number two, which drains to number three, then to number four, and
then to number five. it is likely that outfall number five has high TSS readings because it is the final collection
point. It is likely that solids from the asphalt company flow onto the permittee's site. The reviewer
recommends that the permittee control offsite TSS as much as possible while also working to control any
onsite TSS."
1011: There are still high apparent TSS recurring issues, as well as some pH exceedences as well. It is unclear as
to why this is occurring. The permittee has not addressed this in the application. pH will be kept in the permit
and a tiered response is also now included in this permit draft.
3. Impairment: From 2007: "This facility drains to an unnamed creek of South Buffalo Creek. The 303(d) list
divides Stream Index Number 16-11-14-2 into three parts; a, b, and c. This facility drains to "a", which is
classified as from the source of the creek to McConnell Road. This 15.4-mile section was impaired in 1998 for
biological integrity, and in 2006 for turbidity standard violation. Both the 303(d) list and the Basinwide Plan
Page 4 of 10

NCS000077
cite MS4 NPDES as the source for this stress on the creek."
2012: On the 2012 Draft North Carolina 303(d) List (Category 5), there is no entry for South Buffalo Creek 16-
11-14-2 "a". Designations a, b and c does not exist in BIMS as well. On the 2012 303D list, the sections b and c
are listed tor ecological/biological integrity. 1 have contacted the TMOL/MTU unit and they sent me a
confirmation that 16-11-14-2a is still listed as impaired for biological/ecological integrity and fluoride, selenium
and cyanide have been moved to the AU 16-11-14-2c because the TMDL was develop to address these
discharges specifically. See below for email wording.
4. Threatened and Endangered: Information no longer available.
5. Location: This facility drains to NSW waters.
6. Significant Facility Changes Since Previous Permit: Previous 2007 Permit Reivew: "A Mix and blend operation
within building number five was shut down in 2000. In 2003, a hot melt process was started up in building
number three. The raw materials used in this process have containment structures. The applicant says that
neither change has impacted the site stormwater program".
2012 Draft Changes: A warehouse was installed around Building 2 and placed in operation on September 2010.
There is a new stormwater drainage basin as denoted in the map as Outfoll #2, which is located east of
Building 2. A new Drainage basin was also installed in the front of the building on the west side which drains to
outfall No. 3.
The TSE Tank farm has a drainage valve from the secondary containment area in which the outlet opens to the
the soil. This valve is monitored closely and only opened to release rainwater from the secondary containment
area. This has been added as Outfoll No. 6 to the stormwater plan.
7. Analytical Monitoring Notes:
2012 Draft: Permittee did not turn in qualitative monitoring for the entire permit cycle. However, the
monitoring that was turned in indicates that TSS and pH had some ongoing issues at the facility. There was no
tiered response in place in the previous permit cycle so that now will be implemented. Permittee appears to
have sampled in October and November of 2011, but this was not in their permit requirements. There have also
been some pH exceedences as well. It is unclear as to why this is occurring. The permittee has not addressed
this in the application.
Qualitative Monitoring Notes:
2012 Draft: Permittee did not turn in qualitative monitoring for the entire permit cycle. However, the
monitoring that was turned in indicates that qualitative monitoring for this facility does not highlight any
problems.
Page 5 of 10

NCS000077
From: Behm, Pamela
Sent: Friday, March 30, 2012 11:16 AM
To: Jones, Jennifer
Subject: 2012 draft 303(d) list
We submitted the draft list to EPA this morning for approval. The list sent to EPA includes the impairments for 16-11-14-2a, see below. Fluoride,
selenium, and cyanide has been moved to the AU 16-11-14-2c because the TMDL was developed to address the discharge specifically, so I don't think
that needs to be a component of your permit.
Hope this helps! If you have any other questions, give me a call. Thanks,
Pam
201.2'North Carolina 303(a)11st-Category.S
Cape Fear°River Basin °10- igh Wa#ershed-0303000201 Ai edyfFaik
>,.''p1tf,NumSen- knmr ihe9eoiptlan Wngth at Area !}ntLs ClgasJfic�tli�rn Cdtr pry
.Category;,
Rating,? use,
Reason for Rating
Parameter- Year!
>,_.:ib 11 is 2e
Sdtith'8trffalo;Cseek.
FramsourcatuTAcConriell Rd
iSA FW Mi!es wSv,l�tSW: ;s
5 Impaired =A'quaiic',t:ife FalrBioctassfficatf.
iologfcai IntegrityF1sKCom 2012-1
15 Impaired `Aquatic'Life Fair Bioclassihcation Ecological biological integrity Benthos -2008.
j ,16 11=is-2b. S6uth`BuffiIotraek From Mkonnerl�lid,to u ib a 7 Fw miles, VJ5 H;NSW 5
75 Impaired Aquatic Life, 'Poor.Bioclassification 'Ecological/biological'Integrity.FishCom -1998
>,,16'11 SS 2c'. SputF1'BYffalp'CiCBit,: From US70toBuffalo[ceek 4:8 "'FW Milei W5V;N .s,
5 Impaired
Aquat1c'Uf4,.
5tandardAclation,.
.Copper_:
206$:
5 Impaired
Agyatic`Ufe'
StaadaraNiolation:
.Zinc,
?200$'.
E-mail correspondence to and From this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties.
Page 6 of 10

NCS000077
Table 1: Analytical Monitoring
TSS
Nitrogen Phosphorus
Permit
Outfall
rainfall (mg/L)
(mg/l) 30 (mg/L) 2
Numbers
Lab #
Number
date"sampled
T(In) 100 pH 6-9
mg/I mg/I
NCS000077 40 ; 6 10/19/11 0.18 9.6 I 7.1 ND ND
NCS000077 40 5 10/19/11 0.18 32.7 ` 6.9 ND
- -- -t - t
NCS000077
40
2 i
10/19/11�
0.18 ND 7.2 ND
NCS000077
40 '
6
09/21/11 I
0.34 681
9.1
5.4
^NCS000077
40� _
5
09/21/11 '
0.34 260'
9.2
4.7
NCS000077
40 '
4
09/21/11
0.34 + 15.7_i
8.1
1.4
NCS000077
40 '
3
09/21/11
0.34 11.9
8.6
3.2
NCS000077 ,
40
2 '
09/21/11
0.34 132
8.4
3.6
NCS000077_
40
1
09/21/11
I
0.34 1S.7
7
1.1
NCS000077 -�
�_
_1
5/12/2011 - -
0.3 24 - ,.NR
-
8.7
NCS000077
2
5/12/2011
0.3 6.7
NR "
1.1
NCS000077
3
5/12/2011
0.3 ; 8.3
NR
2.9 nd
NCS000077
I
4
5/12/2011 `
0.3 ! nd
NR
IS nd
NCS000077
5
5/12/2011
0.3 ! nd
OR
0.64 nd
Page 7- of 10
0.082
0.096
0.36
0.38
0.057
0.19
0.25
0.068
0.2
0.052

NCS000077
TN
m IL
TP
m IL
TSS
m 1L
Benchmark:
30 (mg/L)
Benchmark:
2 (mg/L)
Benchmark:
100 (mg/1)
Required
Sampling
Ran e
Date
Outfall #1
Q1, 2003
13-Mar-0
1.75
0.128
34.3
Q2, 2003
5-Apr-0
2.11
0.661
6
Q3, 2003
2-Jul-03
2.98
0.596
Q4, 2003
28-Oct-03
<1.0
22.5
Required
Sampling
Raring
Date
Outfall #2
Q1, 2003
13-Mar-0
3.04
0.851
90
Q2, 2003
5-Apr-03
1.86
0.625
5.33
Q3, 2003
2-Jul-03
1.30
0.192
72.0
Q4, 2003
28-Oct-03
<1.0
0.666
22.2
Required
Sampling
Ranae
Date
Outfall #3
Q1, 2003
13-Mar-03
1.59
0.104
6.0
Q2, 2003
5-Apr-03
1.79
0.223
20.0
Q3, 2003
2-Jul-0
2.35
0.180
6.0
Q4, 2003
28-Oct-0
0.670
0.551
10.
Required
Sampling
Range
Date
Outfall #4
Q1, 2003
13-Mar-0
1.97
0.545
163
Q2, 2003
5-A r-03
1.71
0.274
18.6
Q3, 2003
2-Jul-03
1.42
<0.050
10.2
Q4, 2003
28-Oct-0
<1.0
0.510
6.6
Required
Sampling
Ranae
Date
Outfall #5
Q1, 2003
13-Mar-0
4.23
0.709
8
5-A r-03
<1.0
0.583
k2003
2003
2-Jul 03
<1.0
0.089
1
Q4, 2003
28-Oct-0
1.96
0.211
Page 8 of 10

NCS000077
Revised Permit Recommendations: Analytical Monitoring:
1. Retaining a!! analytical monitoring permit parameters.
2. Ail analytical monitoring remains as semi-annuai during a representative storm event as defined in Part ii
Section B. The permittee must also document the total precipitation for each event. 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. Additionally, samples must be taken a minimum of 60 days apart,
as specified in Table 2.
3. Benchmarks for analytical monitoring have been added to this draft permit. Exceedances 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. If the sampling results are above a
benchmark value, or outside of the benchmark range, for any parameter at any outfall then the facility shall
follow the Tier 1 guidelines which require a facility inspection within two weeks and implementation of a
mitigation plan within two months. If during the term of this permit, the 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 facility shall follow the Tier 2 guidelines which require a repetition of
the steps listed for Tier I and also immediately institute monthly monitoring for all parameters at every outfall
where a sampling result exceeded the benchmark value for two consecutive samples.
4. The permittee is required to collect all of the analytical and qualitative monitoring samples during representative
storm events as defined in Part II Section B. Qualitative monitoring is required regardless of representative
outfall status.
5. The permittee is responsible for all monitoring until the renewal permit is issued. See Footnote I of Tables 1, 4,
and 5.
6. The flow reporting requirement has been removed per DWQ revised strategy. (The total rainfall parameter is in
this permit, however.)
7. Vehicle maintenance monitoring has been revised to semi-annually in order to coincide with analytical and
qualitative monitoring.
Other Proposed Changes to the Previous Permit:
1. Additional guidance is provided about the Site Plan requirements. The site map must now identify if the
receiving stream is impaired and if it has a TMDL established. It must also describe potential pollutants in each
outfall. The map requirements are stated more explicitly. And, the site plan must contain a list of significant
spills that have occurred in the past three years and also must certify that the outfalls have been inspected to
ensure that they do not contain non-stormwater discharges. Additional information is provided in Part 11 Section
A.
2. Additional requirements for the Stormwater Management Plan have been specified in Part It Section A. More
details regarding secondary containment are provided.
3. Additional requirements for the Stormwater Pollution Prevention Plan have been specified in Part Il Section A.
The plan must also be updated annually to include a list of significant spills and to certify that the outfalls do not
contain non-stormwater discharges.
4. The facility must now implement a semi-annual Facility Inspection Program of the site's stormwater
management controls as specified in Part II Section A.
5. Information regarding the No Exposure Exclusion has been added to this draft 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. Additional information
is provided in Part I Section A.
Page 9 of 10

NCS000077
Recommendations: Based on the documents reviewed, the application information submitted on October 5, 2011
sufficient to issue an Individual Stormwater Permit.
Prepared by (Signature)
Stormwater Permitting Unit Supervisor
for Bradley Bennett
Date
Concurrence by Regional Office Da
RO Water Quality Supervisor.
Date
Regionai Office Staff Comments (arrach additional pages as necessary)
Page 10 of 10

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
February 19, 1999
ROSS SHINGLEDECKER
DOW CORNING CORPORATION
2914 PATTERSON STREET
GREENSBORO, NC 27407
1 LTI?WA
•
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: NPDES Stormwater Permit Renewal
Dow Coming Corporation
Permit Number NCS000077
Guilford County
Dear Permittee:
Your facility is currently covered for stormwater discharge under NPDES Permit NCS000077. This permit
expires on August 31, 1999. In order to assure your continued coverage under your permit, you must apply to the
Division of Water Quality (DWQ) for renewal of your permit. To make this renewal process easier, we are
informing you in advance that your permit will be expiring. Enclosed you will find an individual permit renewal
application form, supplemental information request, and Stormwater Pollution Prevention Plan certification.
Filing the application form along with the requested supplimental information will constitute your application for
renewal of your permit. The application form must be completed and returned along with all requested
information within thirty days of receipt of this letter in order to constitute a timely renewal filing.
Recent legislation modified the fee structure for DWQ permits. Renewal fees have been eliminated and annual
fees have been changed. The new annual fee for your permit is now $715.00 (you will be invoiced later this year
for your annual fee.) A copy of the new fee schedule is enclosed in this package.
Failure to request renewal within the time period indicated may result in a civil assessment of at least $250.00,
Larger penalties may be assessed depending on the delinquency of the request. Discharge of stormwater from
your facility without coverage under a valid stormwater NPDES permit would constitute a violation of NCGS
143-215.1 and could result in assessments of civil penalties of up to $10,000 per day.
If you have any questions regarding the permit renewal procedures please contact Tony Evans of the Stormwater
and General Permits Unit at [phone], ext. 584.
Sincerely,
Bradley Bennett, Supervisor
Stormwater and General Permits Unit
cc: Central Files
Winston-Salem Regional Office
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
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