NC0088773_Renewal Application_20151209

J
Yiw.
December 8, 2015
NC Department of Environmental Quality
Division of Water Quality,NPDES Unit
1617 Mail Service Center RECEIVEDIDENRIDWR
Raleigh,NC 27699-1617
DEC ® 9 2015
Subject: NPDES Renewal
Permit Number—NCO088773 Water Quality
Permitting Section
Dow Corning—Greensboro GW-Rem
Guilford County,North Carolina
Enclosed please find one copy of the NPDES permit renewal application along with a site map
and most recent data for the subject permit.
Under the current permit, analysis of total suspended solids (TSS) is performed monthly and
analysis of specified volatile organic compounds (VOCs) and chronic Whole Effluent Toxicity
(WET) is performed quarterly. During the event reported herein, TSS and VOCs were not
detected and chronic toxicity passed; therefore all parameters were within permit limits for the
reporting period.
If you have questions or comments about this submittal or need additional information, please
contact the undersigned.
Regards,
URS Corporation—North Carolina
(NW / la' ,(5^
Walt Plekan, LG
Project Manager
Enclosure
cc: Ronica Edgerton—Dow Corning Corporation(electronic)
URS Corporation—North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, NC 27560
Tel:[phone]
Fax: [phone]

NPDES PERMIT APPLICATION - SHORT FORM C - GW
For discharges associated with groundwater treatment facilities.
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number INCO088773
If you are completing this form in computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise,please print or type.
1. Contact Information:
Owner Name Dow Corning Corporation
Facility Name Greensboro Facility RECERIEnmFNRIDWR
Mailing Address 2914 Patterson Street
City Greensboro DEC 0 9 201`_
State / Zip Code North Carolina 27407 Water Quality
Telephone Number [phone]
PermMing36diOrl
Fax Number ( )
e-mail Address [e-mail]
2. Location of facility producing discharge:
Check here if same as above
Street Address or State Road
City
State / Zip Code
County
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name URS Corporation of NC c/o Walt Plekan
Mailing Address 1600 Perimeter Park, Suite 400
City Morrisville
State / Zip Code North Carolina 27560
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status:
Federal ❑ State ❑ Private ® Public ❑
Page 1 of 3 C-GW 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - GW
For discharges associated with groundwater treatment facilities.
5. Products recovered:
Gasoline ❑ Diesel fuel ❑ Solvents ® Other
6. Number of separate discharge points: 1
Outfall Identification number(s) 001
7. Frequency of discharge: Continuous ® Intermittent ❑
If intermittent:
Days per week discharge occurs: Duration:
8. Treatment System Design flow 0.001 MGD
9. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
to an unnamed tributary to the South Buffalo Creek (Stream Segment 16-11-14-2), a
waterbody currently classified C_NDW within subbasin 03-06-02 of the Cape Fear River Basin
36 3 14N, 79 51 04W
10. Please list all additives to the treatment system, including chemicals or nutrients, that have
the potential to be discharged.
There are no additives to the treatment system
11. Is this facility located on Indian country? (check one)
Yes ❑ No
12. Additional Information
All applicants (including renewals):
A USGS topographical map (or copy of the relevant portion) which shows all outfalls
A summary of the most recent analytical results (effluent data, if available) containing the
maximum values for each chemical detected
NEW Applicants only:
Engineering Alternative Analysis
Description of remediation treatment system components, capacities, and removal efficiency
for detected compounds.
If the treatment system will discharge to a storm sewer, written approval from the
municipality responsible for the sewer.
A list of any chemicals found in detectable amounts at the site, with the maximum observed
concentration reported for each chemical (the most recent sample must be collected less
than one year prior to the date of this application)
For petroleum-contaminated sites-Analyses for Volatile Organic Compounds (VOC) should
be performed. Analyses for any fuel additives likely to be present at the site and for phenol
and lead should also be performed.
> For sites contaminated with solvents or other contaminants - EPA Method 624/625
analysis should be performed.
Page 2 of 3 C-GW 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - GW
For discharges associated with groundwater treatment facilities.
13. Applicant 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.
WA)�C� &)(O-n � ,jYG�
Printed name of Person Signing Title
)wA::, ) 2,) 0 ) 5-
Signature of KPPYcant Date
North Carolina General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false
statement representation, or certification in any application, record, report, plan, or other document files or
required to be maintained under Article 21 or regulations of the Environmental Management Commission
implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or
monitoring device or method required to be operated or maintained under Article 21 or regulations of the
Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable
by a fine not to exceed $25,000, or by imprisonment not to exceed six months, or by both. (18 U.S.C. Section
1001 provides a punishment by a fine of not more than $25,000 or imprisonment not more than 5 years, or both,
for a similar offense.)
Page 3 of 3 C-GW 03/05

Approximate Property .....
ark Boundary
C
Outfall 0011
jJT,'to South Buffalo Creek,
''(flows south)
Buffdfo Greek
*w-
0,
f
' US Hwy 1-40
-High Point Road
Alz."11
DOW Corning Corporation Facility
Greensboro GW-REM Location
Receiving Stream UT to South Buffalo Creek Stream Segment: 16-11-14-2 not to scale
State Grid/Ouad: C-19-SE/Greensboro,NC Sub-Basin: 03-06-02
Stream Class: WS-V;NSW HUC: 03050105
Latitude: 36'3'14" N Permitted Flow: 0.001 MGDNPDES Permit NCO
Longitude: 79'51'04" W Drainage Basin: Cape Fear River No= n
rt h � Guilford Coun

URS
November 20, 2015
Attn: Central Files
Division of Water Quality
1617 Mail Service Center
Raleigh,NC 27699-1617
Subject: Transmittal—October 2015 Discharge Monitoring Results
Permit Number—NCO088773
Dow Corning—Greensboro GW-Rem
Guilford County,North Carolina
Enclosed please find an original and one copy of the monthly Discharge Monitoring Report for
the subject permit. Under the current permit, analysis of total suspended solids (TSS) is
performed monthly and analysis of specified volatile organic compounds (VOCs) and chronic
Whole Effluent Toxicity(WET) is performed quarterly.
TSS and VOCs were not detected and chronic toxicity passed, therefore all parameters were
within permit limits for the reporting period.
If you have questions or comments about this submittal,please contact the undersigned.
Regards,
URS Corporation—North Carolina
(N ��A"
Walt Plekan, LG
Project Manager
Enclosure
cc: Ronica Edgerton—Dow Corning Corporation(electronic)
URS Corporation—North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, NC 27560
Tel:[phone]
Fax: [phone]

J
EFFLUENT
NPDES PERMIT NO. NC 0088773 DISCHARGE NO.001 MONTH October YEAR 2015
FACILITY NAME Dow Coming Facility Remediation Site CLASS C COUNTY Guilford
CERTIFIED LABORATORIES R&A Laboratories,Inc. CERTIFICATION NO. 34
(List additional laboratories on the backside/page 2 of this form)
OPERATOR IN RESPONSIBLE CHARGE (ORC) Glenn Price GRADE 1 CERTIFICATION NO. 985800
PERSON(S)COLLECTING SAMPLES Neal McDuffie
CHECK BOX IF ORC HAS CHANGED Q NO FLOW/DISCHARGE FROM SITZ❑
Mail ORIGINAL and ONE COPY to: /
ATTN:CENTRAL FILES X
DIVISION OF WATER QUALITY (SIGNATURE OF OPERATOR IN RESPONSIBLE CHARGE) DATE
1617 MAIL SERVICE CENTER BY TMS SIGNATURE,I CERTIFY THAT THIS REPORT IS
RALEIGH, NC 27699-1617 ACCURATE AND COMPLETE TO THE BEST OF 1111'KNOWLEDGE.
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Copy DEM Form MR-I(12/93)

Facility Status:(Please check one of the following)
All monitoring data and sampling frequencies meet permit requirements
(including weekly averages, if applicable) Compliant
All monitoring data and sampling frequencies do NOT meet permit requirements
Noncompliant
The permittee shall report to the Director or the appropriate Regional Office any noncompliance that potentially threatens public
health or the environment. Any information shall be provided orally within 24 hours from the time the permitte 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.
If the facility is noncompliant,please attach a list of corrective actions being taken and a time-table for improvements to be
made as required by Part II.E.6 of the NPDES permit.
"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 a 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."
Jake Fitzgerald,Plant Manager-Dow Corning Corporation
Permitte (P e e r'nt or e)
tl S
Signature of Permitee**' Date
(Required unless submitted electronically)
2914 Patterson Street Greensboro NC 27407 336.547.7100 06/30/16
Permittee Address Phone Number Permit Exp.Date
ADDITIONAL CERTIFIED LABORATORIES
Certified Laboratory(2) Certification No.
Certified Laboratory(3) Certification No.
Certified Laboratory(4) Certification No.
Certified Laboratory(5) Certification No.
PARAMETER CODES
Parameter Code assistance may be obtained by calling the NPDES Unit at at(919)733-5083,or by visiting the Surface Water Protection Section's
web site at h2o.enr.state.ne.ushvas and linking to the Unit's information pages.
Use only units of measurement designated in the reporting facility's NPDES permit for reporting data.
"No Flow/Discharge From Site:Check this box if no discharge occurrs and,as a result,there are no data to be entered for all of the
parameters on the DMR for the entire monitoring period.
'*ORC On Site?:ORC must visit facility and document visitation of facility as required per 15ANCACSO.0204.
'••Signature orPennittee: If signed by other than the permitte,then the delegation of the signatory authority must be on file with the state per
15ANCAC2B.0506(b)(2)(D).
Copy DEM Form MR-I(12/93)

RESEARCh & ANATYIFoCAI Report of Analysis
LAbOR TORk5p Mc. 11/5/2015
For: URS Corporation ��• :,.•••tV C••',� �•,d
1600 Perimeter Park Drive •
Moorisville, NC 27560 °C t� Nc tt34 Z N
zi
Attn: Martha Meyers-Lee NC tt37701
Client Sample ID: Effluent Lab Sample ID: 10713-01
Site: Dow Coming Collection Date: 10/22/2015 6:45
Parameter Method Result Units Rea Limit Analyst Analysis Date/Time
Total Suspended Solids(TSS) SM 2540 D-1997 <5 mg/L 5 JB 10/27/2015
NA=not analyzed
P.O.Box 473 106 Short Street Kernersville, North Carolina 27284 Tel:[phone] Fax:[phone] www.randalabs.com Page 1
rat coa basic v1d

RESEARCH & ANA YTkAt
pp I-AbORATORIES, INC.
�4p
AnolyilcollProcea Cornultanons
D grANµ
Chemical Analysis for Selected Parameters and Sampling Location Identified as Dow Corning Remediation 4stem-Greensbo%NC
(A URS Prolem collected 22 October 2015)
1. Volatile Organics Quantitation
EPA Method 8260 B Limit Effluent
Parameter (nAb) fH b)
1,2 Dichloroethane 0.5 BQL
1,1,1-Trichloroethane 0.5 BQL
Acetone 25 BQL
2-Butanone 25 BQL
Chloroethane 1.0 BQL
Chloroform 0.5 BQL
1,1 Dichloroethane 0.5 BQL
1,2 Dichloropropane 0.5 BQL
Methylene Chloride 5.0 BQL
Trichlorofluoromethane 0.5 BQL
Vinyl Chloride 0.5 BQL
Total Xylenes 1.0 BQL
Dilution Factor 1
Sample Number 10713-01
Sample Date 1022/15
Sample Time(hrs.) 0645
Date Analyzed 1028/15
Time Analyzed 1618
Surrogate Recovery Range
DBFM (70.130%) 106%
Toluene-0 (70-130%) 97%
4-BFB (70-130%) 96%
BQL - Br2ow Quaatimrioa r®ih ppb-part per bMion

Research & Analytical
Laboratories, Inc. CHAIN OF CUSTODY RECORD
Analytical /Process Consultations
Phone[phone]
Water/Wastewater Misc.
Company URS—Dow Corning Job No.
Street Address Project Quarterly Sampling °' c
Pl �c Print)City,State,Zip Sampler Name va� H � of c x a
y
x
C i 'n a C7 Z O E
Contact Phone Sampler Signature
m s v d v c?
w z >
a
Sample Number Temp Res. Chlorine Sample � � � V
E
Lab Use Only) Date Time Comp Grab Removed Matrix Sample Location/I.D. e e
0. CLI
( .0.a 0.a
Y or N S or W N N N N ^" Re nested Analysis
/`22 490e S- X W Effluent 5 4 l *See Remarks
Q TB 2 2 TB
J
Rel'nqui ied By at ime Received By gW Remarks: *TSS,1.2 Dichloroethane,1.1.1 Trichloroethane,Acetone,2-Butanone,
Z3lj e c7Gt, Chloroethane,Chloroform,1.1 Dichloroethane, 1.2 Dichloropropane,
Relinquished By Date/Time Re i By Methylene Chloride,Trichlorofluoromethane,Vinyl Chloride,Total Xylenes
L=
Sample Temperature at receipt °C

v RESEARCh & ANA[yTICA1
LABORATORIES, INC.
Analytical/Process Consultations
29 October 2015
Environmental Sciences Branch,
Div. of Environmental Management
N.C. Dept. of EHNR
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Attention: Ms. Cindy Moore
Subject: Bioassay Report
Dear Ms. Moore:
Enclosed please find the results of the chronic pass/fail bioassay performed by
Research & Analytical Laboratories, Inc. for URS-Dow Corning. All analytical procedures
used are outlined in the North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedures,
December 1984, revised February 1998. All physical parameters measured during the test
were well within the prescribed limits as set forth in this manual.
If you have any further questions or need any additional information please do not
hesitate to call.
Sincerely,
RESEARCH&ANALYTICAL LABORATORIES,INC.
Sidney L. Champion
Vice President&Director of Laboratory Services
SLC/af
Enclosure
P.O. Box 473• 106 Short Street•Kernersville, North Carolina 27284.336-996-2841 •Fax [phone]
www.randalabs.com

Effluent Toxicity Report Form - Chronic Pass/Fail and Acute LC50 Date: 10/29/15
Facility: DOW CORNING NPDES#: NCOOSS773 Pipe#: 001 County: GUILFORD
Laboratory Performing est: R & A LABORATORIES, INC.
Comments: Final Effluent
X
e era or in Response a charge
–UgffX
a e o ora ory Supervisor * PASSED: 1.47% Reduction
Work Order: 10548/10710 Environmental Sciences Branch
MAIL ORIGINAL TO: Div. of Environmental Management
N.C. Dept. of EHNR
1621 Mail Service Ctr
North Carolina Ceriodaphnia Raleigh, North Carolina 27699-1621
Chronic Pass/Fail Reproduction Tonicity Test Chronic Test Results
Calculated t = 0.583
Tabular t = 2.508
CONTROL ORGANISMS 1 2 3 4 5 6 7 8 9 10 11 12 $ Reduction = 1.47
# Young Produced 24 21 24 22 25 22 23 22 23121125 21 It Mortality Avg.Reprod.
0.00 22.75
Adult (L)ive (D)ead L L TLL L L IL L L L L L Control Control
0.00 22.42
Effluent W: 90W Treatment 2 Treatment 2
TREATMENT 2 ORGANISMS 1 2 3 4 5 6 7 8 9 10 it 12 Control CV
6.526$ PASS FAIL
# Young Produced 21124123121 25 23 23 22 21 22 21 23 control orgs X
producing 3rd
brood Check One
Adult (L)ive (D)ead L L L IL L L L L L L L L 10096
1st sample ist sample 2nd sample Complete This For Either Test
PH Date:Test Start
Control 6.97 7.05 6.94 7.03 6.95 7.04 Collection (Start) Date
Treatment 2 6.94 7.03 7.28 7.37 7.27 7.35 tele le 1: 10/20/15 Sample 2: 10/22/15
Sample Type/Duration 2nd
s s s Grab Comp. Duration D 1st P/F
t e t e t e I S S
a n a n a n Sample 1 X hrs L A A
r d r d r d U M M
t t t Sample 2 X hrs T P P
1st sample 1st sample 2nd sample
D.O. Hardness(mg/1) 48
Control 8.6 8.4 !8±.68.3E
8.6 8.4
Spec. Cond. (pmhos) 191 432 454
Treatment 2 8.5 8.3 8.6 8.3
Chlorine(mg/1) 0.04 0.02
LC50/Acute Toxicity Test Sample temp. at receipt(OC) ,,,,..,, 3.1 3.3
(Mortality expressed as *, combining replicates)
$ $ $ Note: Please
Concentration Complete This
Section Also
t w w W Mortality
start/end start/end
LC50 = Method of Determination Control
95* Con i�Limits Moving Average Probit
Spearman Karber _— Other — High
Conc.
pH D.O.
Organism Tested: Ceriodaphnia dubia Duration(hrs) :
Copied from DEM form AT-1 (3/87) rev. 11/95 (DUBIA ver. 4.32)

Anelybegilprocese Con es
BIOASSAY CHAIN O CUSTODY RECORD
CUent: County. Pipe It:_NPDES
Collector (Print)• Jr Coe-'
Concact Persa,
Cofiector (Signature.• 4 Address:
Phone Number:
Sample Couectbn
Semple Dae/ Date/ TornSample Type No. of U Required
p Analysis
Lab* Description Time Time (°C) containers Arrival (saute,chronic
(RAL only) (see note ) Started Ended End Comp.Tarz seat 110C1
LA ilc-
" for Sample Description please uOe Effluent, influent, Upstream, Post Clz, Etc,
RellrwpAshed y: nature) Received by: (Signature) Datpfnvle
Relinquished by: (Signature) Received by:( nature) Daternme
Method of Shipment: Logged in by:
Moved 1r, oases_.4r/ IniUeils_ _ Initlals /'M � b/epL.4o ;S
Note: Original sent with shipment
Copy retained by collector
P.O.Box 473.108 Short Street•KernerwAlle,North Carolina 27284.338-888-2841 •Fax [phone]
www.randelebs.00m

StANAkMW
AoNdasyPPOC.w Conarwfts
BIOASSAY CHAIN Q CUSTO/DYr RECORD-
Cltent: `6a"j /"/A 'k County,: Pipe#: oa NPDES
Collector (Print): Conract Paso;,.
Conector (Signature: Address:
Phone Number:
Sample-Collection
Sample Lab# Description 'def DTime ate/ (emp Sample Type No. of e
mp Analysis
Upon Required
(RAL only) (see note") Started Ended End Comp. drab containers Arrival (acute,chrordc
sent (°C) bioassay)
/a716 —o Z0&ter
.3
" for Sample Description please use Effluent, Influent, Upstream, Post Ctz, Etc.
Relinquished by., Sign re) Received by: (Signature) p e
R hed by: (Signature) Rec4ved by: (8tgnature) DateMme
Method of Shipment: Legged in by: Moved to bloassQ
Initlals Initials
Note: Original sent with shipment
Copy retained by collector
P.O,Bax 473.106 Short Street•KernerwAlle,Noah Caroline 27284.338.888.2841 •Fax [phone]
www.randalabo.com

September 23, 2013
Point Source Branch
Surface Water Protection Section
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Delegation of Signature Authority
Dow Corning—Greensboro GW-REM
NPDES No. NC0088773—Physical/Chemical, Class 1
To Whom It May Concern:
Recently, Jake Fitzgerald has replaced Pamela Berry as Plant Manager of the Dow
Corning-Greensboro facility. By notice of this letter, I hereby delegate signatory
authority to each of the following individuals for all permit applications, discharge
monitoring reports, and other information relating to the operations at Dow Corning-
Greensboro 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.
Walt Plekan, LG Project Manager with URS Corporation
Stephanie Hempel, LG Project Geologist with URS Corporation
If you have any questions regarding this letter, please feel free to contact me at (336)
547-7100.
Sincerely
Jake Fitzgerald
Plant Manager
cc: Winston-Salem Regional Office, Surface Water Protection Section
Technical Assistance and Certification Unit

PAT MCCRORY
Governor
a
DONALD R. VAN DER VAART
,Secrelaiy
Water.Resources S. JAY ZIMMERMAN
ENVIRONMENTAL QUALITY
Director
s
December 9, 2015
Walter Plekan
Down Corning Corporation
2914 Patterson Street
Greensboro,NC 27407
Subject: Acknowledgement of Permit Renewal
Application No.NCO088773
Greensboro Facility
Guilford County
Dear Permittee:
The Water Quality Permitting Section has received your permit renewal application on December
9, 2015. A member of the NPDES Unit will review your application. They will contact you if additional
information is required to complete your permit renewal. Per G.S. 150B-3 your current permit does not
expire until permit decision on the application is made. Continuation of the current permit is contingent on
timely and sufficient application for renewal of the current permit. Please respond in a timely manner to
requests for additional information necessary to complete the permit application.
If you have any additional questions concerning renewal of the subject permit,please contact Wren
Thedford at 919-807-6304 or [e-mail].
Sincerely,
_ Wl�evv TI�►zof�fo-�d�
Wren Thedford
Wastewater Branch
cc: Central Files
1Ninnsto@�S"aleinRegional Office, Water Quality Regional Operations Section
NPDES Unit
State of North Carolina I Environmental Quality I Water Resources
1617 Mad Service Center I Raleigh,North Carolina 27699-1617
919-807-6300