NC0004626_WASTELOAD ALLOCATION_19891117

NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0004626
Document Type:
Permit Issuance
'Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
Correspondence
Instream Assessment (67B)
Environmental Assessment (EA)
Permit
History
Document Date:
November 17, 1989
This document is printed on reuse paper - more any
ooRxtent on the rQYQrf►e side

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PPG INDUSTRIES, INC./P.O. BOX 949/LEXINGTON, NORTl-i CAROLINA 27293IAREA 7041249-$151
Works No. 53
Fiber Glass Products
November 17, 1989
Mr. Dale Overcash
Dept. of Health, Environment, and Natural Resources
P. 0. Box 27687
Raleigh, NC 27611--7687
Subject: NPDES Permit #NC0004626
PPG Industries, Inc.
Davidson County
Dear Mr. Overcash:
rJith reference to our telephone conversation and the October 19,
1989 letter signed by Mr. Wilms,. PPG Industries requests that addi-
tional consideration be given to our previous request to eliminate or
modify the monitoring requirements for oil & grease and Nitrate -
Nitrite Nitrogen and the elimination of the effluent limits for oil &
grease. This request is based on the following:
1.
The oil referred to as a constituent
of our fiber glass coating is
a biodegradable vegetable oi.l, not a
petroleum product.
2.
There has never been a noticeable oil
sheen at our outfall nor
have any of the routine inspection reports
by the State made
reference to any evidence of oil/grease
at our treatment plant or
outfall .
3.
No specific standard exists for oil &
grease and we feel that an
arbitrary limit of 30/60 mgle is unwarranted
and. that the require-
ment to monitor on a weekly basis is
excessive.
4.
Our wastewater is Nitrogen deficient
and requires that we feed
aqueous Ammonia daily to our aeration
tanks. The feed rate is
controlled by the monitoring of residual
Ammonia in our final
clarifiers.
5.
Our interpretation of 15NCAC 28.0508
(d) is that the specific
monitoring requirements are for those
listed SIC codes. Our plant
is not covered by any of these codes,
including the 9999 group
which refers to domestic sewage. As
stated previously our waste
only contains 8 percent domestic and
the other monitoring require-
ments have not been applied to us, therefore
we do not feel that
the Nitrate -Nitrite should either.

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We feel that our requests are reasonable and that the
elimination'
of these additional requirements will not adversely affect
the water
quality of N. Potts Creek or Nigh Rock Lake.
--._Thank you for your attention in this request.
Sincerely,
W. Buchanan
Supervisor,
Environmental Affairs
dg
pc: F. Hord
M. LeCroy
L. Sal lard

I
State of North Carolina
Department of Natural Resources and Community Development
Division of Environmental Management
512 North Salisbury Street Y Raleigh, North Carolina 27611
James G. Martin, Governor R. Paul Wilms
William W. Cobey, Jr., Secretary October 19, 1989 Director
Mr. J. W. Buchanan
Supervisor, Environmental Affairs
PPG Industries, Inc.
P.O. Box 949
Lexington, North Carolina 27293
Subject: PPG Industries Permit Concerns
NPDES Permit No. NC0004626
Davidson County
Dear Mr. Buchanan,
i am writing in response to your l(tcter c,ated July "�, 1�6., ccncer:i`..y ,_-hL;
NPDES permit renewal for PPG Industries. I offer the following reply to your
specific comments.
1) Oil & Grease
PPG produces fiber glass yarn which has a lubricant coating consisting
of starch and oils. When oil and grease is anticipated to be present
in an effluent, the Division typically employs an effluent limit for oil
and grease of 30 mg/1 as a monthly average and 60 mg/l as a daily maxi-
mum. The samples analyzed from PPG's effluent (range of 1 -29 mg/l with
an average of -11.5 mg/1) for one month confirms the need for a limit on
oil and grease.
2) Chronic Toxicity
Toxicity limits and testing frequencies are a basic NPDES permit require-
ment for all industrial facilities, facilities with complex wastewaters,
and major municipalities. Therefore, the quarterly chronic toxicity
limit will remain in the permit.
3) Nitrate &_Nitrite Nitrogen
Pursuant to Regulation 15 NCAC 2B.0508 (d), all facilities in the Yadkin
River basin equal to or greater than 50,000 gpd, shall monitor for Total
Phosphorus and Total Nitrogen on a quarterly basis. This regulation spe-
cifies that "Total Nitrogen shall be the sum of total Kjeldahl nitrogen,
nitrate nitrogen, and nitrite nitrogen expressed as "N" in mg/111. PPG
Industries discharges into North Potts Creek which feeds into High Rock
Lake. High Rock Lake is considered eutrophic, therefore all potential
Pollution Prevention Paps
P.O- Box 27687, Raleigh, North Carolina 27611-7687 'Telephone [phone]
An Equal Opportunity Affirmative Action Employer

sources of nutrient loads need to be well documented. Since nitrate and
nitrite nitrogen represent forms of nitrogen that are readily available
for algal growth and PPG,industries is required to monitor these forms,
this reporting requirement will remain in the permit.
4) Total Suspended Solids
Effluent monitoring data for PPG show low variability and averages con-
sistently below the allowable amount of TSS. Therefore, the reduction of
monitoring for TSS from daily to weekly will be accepted.
5) Fecal Coliform
Since domestic wastewater only constitutes 8 percent of the total efflu-
ent the fecal coliform monitoring frequency will be relaxed from daily
in the permit renewal to weekly as contained in the previous permit.
Your request to change the morning sampling time for the stream monitoring pro-
gram is acceptable. We will change this time to "before 9:30 AM" for the morn-
ing sample. However, the person responsible for sampling should be encouraged
to take samples as early as possible to better document diurnal fluctuations.
I hope that this letter adequately addresses your concerns. However, if the
above decisions are unacceptable to you, you have the right to an adjudicatory
hearing upon written request within thirty (30) days following receipt of this
letter. This request must be in the form of a written petition, conforming to
Chatter 1.50g of the North Carolina, General.. Statues, and filed with the office of
Admi:iistrative Hearings, Post 0=iice Drawer 11666, Raleigh,' No,:Lii Carolirra
27604. Unless such a request is made, this decision is final and binding.
If you have any questions or comments regarding this matter please contact Mr.
Trevor Clements or Mr. Dale overcash from my staff at [phone].
Sincerely,
R. Paul Wilms
cc:T.revor Clements
Dale Overcash
Steve Mauney
Central Files

�i
NORTH CAROLINA DEPARTMENT OF NATURAL RESOURCES AND
COMMUNITY DEVELOPMENT
DIVISION OF ENVIRONMENTAL MANAGEMENT
Winston-Salem Regional Office
September 26, 1989
M E M O R A N D U M
t.
I
TO: Dale Overcash s
THROUGH: Steve Mauney J,
FROM: Mike Mickey
SUBJECT: Permit Modification Request
NPDES Permit No. NC0004626
PPG Industries, Inc.
Davidson County
The 7/21/89 modification request submitted by PPG
..concerning the recently reissued NPDES permit has been
reviewed. WSRO recommends that chronic toxicity and nitrate -
nitrite nitrogen remain as stated in the permit,as these
only have quarterly monitoring requirements. The monitoring
requirement and limitation for oil and grease should also
remain as stated in the permit since recent sampling by PPG
has shown levels in the effluent as high as 29 mg/l.
Reduction of the TSS monitoring frequency from daily back to
weekly,as in -the previous permit,is not recommended. Daily
TSS monitoring is standard for most Grade IV facilities.
WSRO does recommend that the fecal coliform monitoring
frequency be relaxed from daily in the draft,to weekly as
contained in the previous permit. Domestic wastewater only
constitutes 8 percent of the total flow to the industrial
WWTP. Values for fecal coliform reported on the
self --monitoring forms during the last twelve months have all
been less than 5/100 ml.
MMM/vm
cc. Central Files
WSRO.-:uhl
Q C E 0.3 1989
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PPG INDUSTRIES, INC./P.O. BOX 9491LEXINGTON, NORTH CAROLINA 27293/AREA 7041249-F151
Works No. 53
Fiber Glass Products
July 21, 1989
Mr. Arthur Mouberry
N. C. Department of Natural Resources RECEI VED
Division of Environmental Management
P. 0. Box 27687
Raleigh, NC 27611-7687 JUL 2 6 1989
P E R P41 T
Subject: Permit Renewal
NPDES # NC0004626
PPG Industries, Inc.
Lexington, Davidson County
Dear Mr. Mouberry:
As requested during our telephone conversation on July 13, 1989,
the following is our written response to the draft permit (dated April
10, 1989) and to the letter signed by Mr. R. Paul Wilms (dated June 20,
1989.
PPG Industries, Inc. operates a -wastewater treatment plant in
conjunction with a fiber glass manufacturing plant. This facility is
not listed in the tables for determining type and frequency of tests in
NCAC TITLE 15, CHAPTER 2, SUQCHAPTER 2B, SECTION .0508. This fact had
been established previously in an Administrative Hearing.
Based on this fact: effluent limits and monitoring requirements
were established and refined during the previous permit renewal
processes. We feel that these requirements were reasonable and served
to insure that the water quality in North Potts Creek was protected.
Since there have been no water quality violations in the -vicin.ity.pf our
discharge attributable to our effluent, we feel that the effluent limits
and monitoring requirements are adequate and that any change In
warranted from a technical or cost basis.
1989
The specific changes which we believe to be unnecessar oApu19 follows.
the protection of -the water quality in North Potts Creek are as lows.
C-ENTRAL FILE
COPY

. FF
`Page 2 s �� 6" V
1. Oil & Grease
We are unclear why this has been added as a requirement-'br''how
the limits were established. This has not been an issue in the
past, nor has there been any evidence of oil or grease in our
er'fluent. We collected effluent samples during the period*.,f
4/11 - 5/25/89. These samples were analyzed by us and also
submitted to a certified commercial laboratory. The result
range from i - 29 mg/1 with an average of 11.5
We feel this indicates that oil & grease is not a problem in
our effluent and should not be added to our permit.
II. Chronic Toxity
Our effluent has been tested twice by the state in the past two
years and found to be non -toxic. We question the value of
adding this as a quarterly requirement. If you feel it must be
tested on a regular basis, perhaps once per year would suffice.
III. Nitrate & Nitrite Nitrogen
Our raw waste stream is extremely low in Nitrogen and requires
that we add Ammonia as a nutrient to our biological process.
The amount of Ammonia fed is controlled by the monitoring of
Ammonia in the effluent and controlled to residual of 1 mg/1 or
less. At this level there is little change of Nitrate or
Nitrite existing in any significant amount. To confirm this,
we sampled the effluent from 4-24 - 5/22/89 and had the samples
analyzed by a certified, commercial laboratory. The results
showed an average Nitrate level of .27 mg/1 with a range from
.05 - .59. The Nitrite levels were all less than .01.
We feel this justifies the elimination of this requirement.
IV. Total Suspended Solids
This parameter has been monitored on a weekly basis since the
issuance of the original NPOES. Since compliance with this
effluent limit has not been a problem, we.question the
necessity of increasing the testing frequency.
V. Fecal Coliform
Our effluent is continuously chlorinated and the residuals are
reported on a daily basis. The Fecal Coliforms are typically
very low (usually less than 10). For this reason we believe
that a test frequency of once per week combined wi-th_the..dai•ly
chlorine residual monitoring should be sufficient.
AUG Is
1989,
CENTRAL FILE COPY +

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S,Fr�i3,:Fi'"f''t"1 r i
- _ i, .•r+ .fie-1�.',�"-_a'SC'rV&'�,,'X ji!bs..3sr ' ••
We are wi 11in to accept -i f2 V
g p your proposed stream •monitor�ng�`.��
program of sampling only one day/week, with an additignal
sample in the afternoon on the same day. We would reques.t''that,
the requirement to sample before 8:00 a.m. be modified,to
perhaps 9:00--9:30. This would allow our technicians time to
get the sample points without requiring them to come to work
before their normal starting time of 8:00.
All other issues as described in the June 20, 1989 letter are
acceptable. We appreciate the opportunity of presenting our comments on
your proposals, and look forward to an'early response.
M.
- Sincerely,
IUp&r�,�W. Buchanan
ervisor, Environmental Affairs
PPG Industries, Inc.
18 1989 U
CENTRAL FILE COF
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0
State of North Carolina
Department of Natural Resources and Community Development
Division of ) nvirorimentid NIzimigcment
512 North Salisbury Street 0 Raleigh, \North Carolina 27611
Jarnes G. Martin, Governor June 20, 1989 R. Nul Wilms
William W. Cobey, Jr., Secretary Director
Mr. J.W. Buchanan, Supervisor
Environmental Affairs
PPG Industries, Inc,
P.O. Box 949
Lexington, North Carolina 27293
Subject: Requested Changes in Draft Permit
PPG Industries, Inc., Davidson County
NPDES Permit No. NCO004626
Dear Mr. Buchanan,
I am writing in response to your letter of May 10, 1989 concern-
ing the changes requested in the renewal letter for the draft
permit f-of PPG Industries' discharge into North Potts Creek. I
offer the following reply to your specific comments.
Your request for the daily average flow of 0.6 MGD to be resumed
as in your previous permit (issued 4/29/77) was granted in this
permit renewal.
Please note that the adjudicatory proceedings which established
specific requirements for the existing NPDES permit do not auto-
matically pertain to this per renewal. However, your concerns
with the instream monitoring frequencies have been carefully con-
sidered and the Division has developed the following alternatives
to the draft permit conditions. The instream monitoring parame-
ters will be dissolved oxygen, temperature, pH, and conductivity.
These parameters should be measured twice per day (morning
samples taken before 8:00 AM and afternoon samples taken between
12:00 PM and 4:00 PM), on a weekly basis during the designated
summer months. All other instream monitoring parameters may be
dropped. We will keep the summer months as June through October
a�equested. This information is necessary for our analysis of
the impact of the discharge on the creek and the adjoining lake
below. The point where PPG Industries discharges to North Potts
Creek is on an upper arm of High Rock Lake. High Rock Lake has
been documented as eutrophic and further impacts to the water
system need to be well documented during the critical periods of
the day.
1�0. 13ox 27687, 161dgh, Nlt>rth Carolina )761r-7687 le{ephone 919-733-7015
An f_r1u71 Opporninity, A({irmativc Action Employer

If the above decisions are unacceptable to you, you have the
right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of the issued permit. This
request must•be in the form -of a written petition, conforming to
Chapter 150B of the North Carolina General Statutes, and filed
with the Office of Administrative Hearing, Post Office Drawer
11666, Raleigh, North Carolina 27604. Unless such a request is
made, this decision is final and binding.
If you have any questions regarding this matter please contact
Mr. Trevor Clements or Mr. Arthur Mouberry from my staff at (919)
733-5083.
'Sincerely ,
R. Paul Wilms
cc: aTrevor-Cle-me nts
Arthur Mouberry
Brenda Smith
Central File

MAY 15 1989
t PERK?!IS & F�C11UrI `r+i,
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PPG INDUSTRIES, INC.IP.O. BOX 949/LEXINGTON, NORTH CAROLINA 27293/AREA 704/249-8151
Works No. 53
Fiber Glass Products
May 10, 1989
Mr. Arthur Mouberry
N. C. Department of Natural Resources
Division of Environmental Management
P. 0. Box 27687
Raleigh, NC 27611-7687
Subject: NPDES Permit No. NC0004626
PPG Industries, Inc.
Lexington, Davidson County
Draft Renewal
Dear Mr. Mouberry:
PPG Industries, Inc. respectfully requests that the significant
changes proposed in the April 10, 1989 draft be deleted and that the
permit be issued with the changes requested in our renewal letter.
The establishment of the critical summer period as June -
October, the testing frequency of Fecal Coiiform and total suspended
solids and other parameters has been previously established through an
adjudicatory hearing and many subsequent meetings between PPG and the
DEM. This has resulted in a permit with adequate effluent limits and
test frequencies to ensure the protection of water quality in the
North Potts Creek area.
We have calculated the additional costs for the proposed changes
as exceeding $3000 per year. Since there have been no water quality
problems in the North Potts Creek area, we do not feel that the
additional costs are justified.
We appreciate your consideration of this request and would like
to suggest that a meeting be held to discuss each of the specific
items on the draft permit before the permit is issued.
Sincerely,
rnUvPironrm'LTental
chanan
or,
Affairs
1
MC.

PPG INDUSTRIES, INC./P.O. BOX 9491LEXINGTON, NORTH CAROLINA 272931AREA 704/249-8151
Works No. 53
Fiber Glass Producls
Ocober 7, 1988
Mr. M. Dale Overcash
Permits and Engineering Unit
Division of Environmental Management
P.O. Box 27687
RECEIVED
Raleigh, NC 27611-7687
OCT I !
Subject: NPDES Permit No. NCO004626 Renewal
PERMITS& ENGINEERIf4C
PPG Industries, Inc.
Lexington, North Carolina
'4
Dear Mr. Overc as h :
M V M
h D
PPG Industries, Inc. respectfully requests
that NPDES Permi '00'Q 5 i988
✓
NCO004626 be renewed for a full term with the following requested
modifications.
P-,.::,
�1.
Return the total daily flow to .6 MGD daily
average and .9 MGD
daily max. as specified in our previous NPDES permit (issued
4/29/77).
2. Reduce the frequency of stream monitoring in the summer months to
once/week.
We propose that the existing effluent limits and other conditions
be retained-.
Enclosed is a check for $150 for the renewed fee and the Standard
Form C Application.
Sincerely
4WBuchanan
Supervisor,
Environmental Affairs
K.

A4Ci"d "S?&Akj-- +b FP I / �Vg'�MPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC00 ®y 6 zE,
Modeler Date Rec.
FACILITY NAME;
Facility Status: i
kircie 0") -
Permit Status: y2 - 110p,A It
(CMd. 0") - —
Major Minorr
Pipe No: �' 1
Design .Capacity (MGD): t_c_ fl
Domestic (X of Flom): 26
Industrial (S of Flow): CN2_%, _37mou S.
Comments:
RECEIVING STREAM: CA-F_-GK
Class:
Sub -Basin: - 0 5 - o7
Reference USGS Quad: 20e NE (please attach)
County:
Regional Office: As Fa Mo . Ra Wa WI
(CA"10 one)
Requested By:- ly& - Date:
Prepared By:1�`.Lt a �LXXJ1J Date: / `
Reviewed By: V rDate: - 70 r
Drainage Area (me) _L1 5- Avg. Streamflow (cfs):
7Q10 (cfs) Winter 7Q10 (cfs) 30Q2 (cfs) --` ,_—
Toxicity Limits: IWC �_ S (cirri. one) Acute (Chroni�
Instream Monitoring:
Parameters �I' r�C OCr01
Upstream
Downstream
Location 6�botj �'1 �� 1�
Location ). U ^ i '6G r�- >
N„,A,oi�
Effluent
Characteristics
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F. Col. (/100ml)
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FOR APPROPRIATE DISCHARGERS, LIST COMPLETE GUIDELINE LIMITATIONS BELOW
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Monthly
Average
Daily
Maximum
Comments
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Request No. :5005
---------------------
WASTEFOAD ALLOCATION APPROVAL FORM ---------------------
Permit Number
: NC0004626
Facility Name
: PPG INDUSTRIES
Type of Waste
: 8% DOMESTIC / 92%
INDUSTRIAL
Status
: EXISTING
Receiving Stream
: NORTH POTTS CREEK
Stream Class
: WS-III
Subbasin
: 030704
County
: DAVIDSON
Drainage
Area (sq mi) : 11.5
Regional Office
: WSRO
Average
Flow (cfs) : 11.0
Requestor
: DAVID FOSTER
Summer
7Q10 (cfs) 1.0
Date of Request
: 12/8/89
Winter
7010 (cfs) 2.2
Quad
: E17NE
3002
(cfs) 2.8
-------------------------
RECOMMENDED
EFFLUENT
LIMITS -------------------------
M06-5 Mad—
—
- 0on6eo4kA_-boh -
Mon Ave Dal
Max
Mon Ave Dal Max
Wasteflow
(mgd):
0.6
5-Day BOD -summer
157 #/d 314
#/d
38mg/1 75mg/1
������
5-Day BOD -winter
: 314 #/d 630
#/d
75mg/l 151mg/1
TSS -summer
: 105 #/d 168
#/d
IVAH C
TSS -winter
: 146 #/d 292
#/d
Fecal Coliform (#/100ml):
1000
PcRPri� � :, l�ipu�f'vt „iiyG
Oil & Grease
30mg/l 60mg/l
--------------------------------- MONITORING -----------------------
Upstream (Y/N): Y Location: ABOVE DISCHARGE POINT
Downstream (Y/N): Y Location: 0.3 MILE BELOW DISCHARGE POINT
---------------------------------- COMMENTS-------
---------------------------
;ECOMMEND INSTREAM MONITORING FOR BODS, DO, TEMPERATURE, AND
7ECAL COLIFORM.
RECOMMEND EFFLUENT MONITORNG FOR TOTAL PHOSPHORUS & TOTAL KJELDAHL NITROGEN
THE ABOVE ARE THE EXISTING LIMITS EXCEPT FOR WASTEFLOW AND OIL & GREASE.
3EE ATTACHED TOXICITY TESTING REQUIREMENT
� �'��,a. �W% V,��o�� ia�►.Q� �iJ 2RL) tL coravti���'s ��A �i� �wec \o�Ns
�'Z�o,nwaQ.�� e.�'<w, Q � I � � � c, �i+z,c '\J�S��i 0 ` 5,.nR. �►
c s :or
Recommended by Date 2
0 B
Reviewed by:
r7ech. Support Supervisor
Regional Supervisor
Permits & Engineering
Date 5.3 _
Date
------------ Date _ 34L'-/--
RETURN TO TECHNICAL SERVICES BY MA j 1 1989

Facility Name 17 � l�
�� S Permit #
CHRONIC TOXICITY TESTING REQUIREMENT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity in any two consecutive toxicity tests,
using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic
Bioassay Procedure - Revised `February 1987) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproductJon or
significant mortality is % (defined as treatment two in the North Carolina procedu:_-
document). The permit holder shall perform quarterly monitoring using this procedure to establish
compliance with the permit condition. The fir t test will be xformed after thirty da}•s from
issuance of this permit during the months of b 1� Effluent
sampling for this testing shall be performed at the PD pe fitted final effluent discharge below
all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it wzs ,,erfc�irry l usi!-g the parameter
code TGP3B. Additionally, DEM Form AT-1 (original) is to be sent to the following aldress:
Attention: Technical Services Branch
North Carolina Division of
Environmental Management
P.O. Box 27687
Raleigh, N.C. 27611
Test data shall be complete and accurate andinclude all supporting chemical/physical measurements
Performed in association with the toxicity; tests; as well as all dose/response, data. Total residual
chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this
monthly test requirement will revert to quarterly in the months specified above.
Should any test data from this `monitoring requirement or tests performed by the North Carolina
Division of Environmental Management indicate potential impacts to the receiving streE n, this
permit maybe re -opened and modified to include alternate monitoring requirements or mits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as rr2-timum
control organism survival and appropriate. environmental controls, shall constitute an Mvalid test
and will require immediate retesting(within 30 days of initial monitoring event). Failur? to submit
suitable test results will constitute noncompliance with monitoring requirements.
7QM 1, © cfs
Permited Flow MGD
IWC%
Basin & Sub -basin
Receiving Stream r+ poiY5 aio
County -
Recommended by:
Date Q,1
*Chronic Toxicity (Ceriodaphnia) P/F at%, ! V, See Part, Condition.