NC0036196_Staff Comments_19950802

NPDES DOCUHENT :SCANNING: COVER SHEET
NPDES Permit:
NC0036196
Clark Creek WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
6
C'-(.4.-C-i
..,..,. _ _.....„,.
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
August 2, 1995
This document is printed on reuse paper - ignore any
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-xt) -\--Wiu V-0,0 Note
DIVISION OF ENVIRONMENT MANAGEMENT
August 2, 1995
MEMORANDUM
TO:
THRU:
FROM:
SUBJECT:
Jay Lucas
Don Safrit �kkjci\
Ruth Swanek W
Carla Sanderson''
Jacquelyn M. Nowell
Request for modification of permit limits and monitoring requirements for
Newton - Clark Creek WWTP
NPDES Permit No. NC0036196
Catawba County
The Instream Assessment Unit has reviewed the request for amendments to the
subject facility's permits. We have the following comments and recommendations for
Newton's requests:
# 3, #5 Modification of monitoring requirements for cadmium and
lead - Instream Assessment reviewed effluent data from 1994 and 1995 in making our
recommendations for the renewal of the cadmium and lead limits at the existing and
expansion wasteflows. The current procedure for the evaluation of toxics data collected by
facilities uses a statistical analysis as recommended by the EPA. This analysis compares
actual, projected, and allowable effluent concentrations in determining whether limitations
or monitoring requirements are to be included in the NPDES permit. Effluent data that is
recorded as below detection is also used in determining these requirements.
Our current procedure recommends that a constituent be limited if the statistically
predicted value of that constituent is greater than the allowable concentration. If the
statistically predicted value of that constituent is less than the allowable concentration, and
this constituent is not already being monitored in the Pretreatment Long Term Monitoring
Plan, then quarterly monitoring is recommended.
According to the analysis, including all the below and above detection values that
have been recorded, it was statistically projected that there is the potential for a value greater
than the allowable or limit in Newton's effluent. Based on this result and additional
consultation with Pretreatment staff, it was determined to continue the cadmium and lead
limits in the NPDES permit. This same analysis resulted in the deletion of limits for several
parameters previously included in Newton's permit. Because of this evaluation, we
recommend continuation of the limit and monitoring frequencies for cadmium and lead.
#4 - Weekly instream monitoring for cadmium to twice per month or
eliminated. Based on the recorded values of cadmium, sampled at State Road 2012,
located 1.3 miles downstream of Newton's discharge. A review of instream data does
indicate that most of the time nearly all the values have been below detection. However
there are some reported values above detection and at or above the standard of 2 µg/1 for
example, 2.3 µg/1 in September 1994 and 2 µg/1 in July 1994. Based on these values, we
cannot recommend elimination of instream monitoring for cadmium.

Memorandum to Jay Lucas
- page 2-
#6 & #7 - Residual Chlorine Limit changed from 26 to 150 µg/l.
The chlorine limit of 26 µg/1 is based on the N.G. chronic criteria of 17 µg/l. By use of the
conservation of mass equation, the allowable level of chlorine that Newton would be able
to discharge and still protect the instream criteria is only 26 µg/I. In addition, the acute
value for chlorine is 28 Re and is not to be exceeded in freshwater. Therefore, a limit
greater than 28 µg/1 cannot be given to Newton. However, because the detection level for
chlorine is < 100 µg/1, if Newton reports the chlorine value as below detection, the facility
will be in compliance.
Please contact me if additional questions.
cc: Rex Gleason
WLA File

DE R
DIVISION OF ENVIRONMENTAL MANAGEMENT
July 20, 1995
MEMO TO: Jay Lucas
FROM: Rex Gleason
PREPARED BY: Michael Parker
-10
SUBJECT: Review of Draft Permit Comments
City of Newton -Clark Creek WWTP
NPDES Permit No. NC0036196
Catawba County
This Office has reviewed the comments as submitted by Mr.
Radford L. Thomas, City Manager, City of Newton concerning the
subject draft Permit. The following comments and/or
recommendations are offered following the order of the items
listed in Mr. Thomas's response.
f. Delete reference to: •two centrifuge sludge thickenersa.
Recommend reference be deleted.
2. Change period for the collection of winter monitoring data.
Recommend that the period for the collection of winter
monitoring data remain as listed in the Permit.
3. Change effluent monitoring for Cadmium from weekly to twice
per month or eliminate the monitoring (and numerical limit)
altogether.
Based on the effluent data supplied by the City it would
appear that a case can be made to remove the Cadmium limit
altogether. Phone conversations with the TSB staff, however
have revealed more specific criteria that have shown the
need to incorporate a Cadmium limit in the Permit. It is
also recommended that the weekly monitoring be reduced to
twice per month as requested by the City. This
recommendation does not conflict with any current guidance
set forth in NCAC 2H .0500 for toxics monitoring
frequency's, however, it does conflict with the current
guidance used by the Division for establishing monitoring
frequencies for Class IV facilities.
116 . r
!ii t oi,.,�. _

Page Two
4. Change upstream and downstream monitoring for Cadmium from
weekly to twice per month or eliminate the monitoring
altogether.
Upon collection of twelve (12) months of weeklv instream
sampling data, it is recommended that the instream
monitoring for Cd be reduced to twice per month provided no
exceedances of the WQ standard for this parameter are found
in the receiving stream. If the stream standard for ed is
exceeded during the 1st year, instream sampling will remain
at weekly during the entire term of the Permit.
5. Change weekly monitoring for Lead to twice per month or
eliminate the monitoring (and numerical limit) altogether.
Ditto response in No. 3
6. Change residual chlorine limit ■above 5.0 MCD• from 26.0
ug/l to 150 ug/1 (Dec. 1 - May 31) and 50.0 ug/1 (June 1 -
Nov. 30).
Defer comment to the TSB.
7. Change total residual chlorine limit ■above 5.0 MCD• from
daily maximum to monthly average.
Defer comment to the TSB.
If you have any questions regarding this matter, please
advise.
MLP
h : \gen\pecomento . doc
•
.10

P.O. Box 550 • Newton, N.C. 28658 • [phone] • Fax: [phone]
WHERE THE HEART 6!
June 22, 1995
Mr. David A. Goodrich
NCDEHNR
NPDES Permits Group
P 0 Box 29535
Raleigh NC 27626-0535
Subject: Request for amendments to the Proposed Draft NPDES Permit
#NC0036196, Clark Creek WWTP, City of Newton
Dear Mr. Goodrich,
The City of Newton staff is requesting the Division to amend items
that are listed below:
1. The City requests that the phrase "two centrifuge sludge
thickeners" be deleted from the Supplement to Permit Cover
Sheet. This is a duplication of the phrase "two gravity
sludge thickeners".
2. The City requests that the winter months for Bod and NH3 as N
under Effluent Limitations and Monitoring Requirements Final
be changed from (March 1 - November 31)" to "(November 1 -
March 31)".
3. The City requests that the weekly monitoring requirement for
cadmium be changed to twice per month, or eliminated and the
e numerical limit removed, at the_effluent sampling location.
From January, 1993, through April, 1995, we collected one
hundred twenty two (122) weekly, 24 hour composite, samples to
monitor cadmium in our effluent. Cadmium in one hundred
seventeen (117) of these samples was less than detectable
(<0.5 ug/1). The average concentration of the one hundred
twenty two (122) tests was <0.53 ug/l. During this time we
did not violate our NPDES limit of 3.5 ug/1, and would not
have violated the proposed limit of 3.0 ug/1 at "above 5.0
MGD". (See attached data)
-- 4. The City requests that the weekly monitoring requirement for
cadmium be changed to twice per month or eliminated, at our
upstream and downstream sampling locations. From January,
1993 through April, 1995, we collected one hundred three (103)
weekly samples to monitor cadmium at our downstream location.
Cadmium in ninety two of these samples was less than
detectable (<0.5 ug/1). The average concentration of the one
hundred three (103) tests was <0.58 ug/1. As indicated in #3

(Nird. 5.
this facility does not impact the stream with cadmium.
The City requests that the weekly monitoring requirement for
lead be changed to twice per month or eliminated, and the
numerical limit removed at our effluent sampling location.
From January, 1993 through April, 1995, we collected one
hundred twenty two (122) weekly, 24 hour composite, samples to
monitor lead in our effluent. Lead in ninety six (96) of
these samples was less than detectable (<5.0 ug/1). The
average concentration of the one hundred twenty two (122)
samples was <4.7 ug/1. The highest monthly average during
this time was 11.2 ug/1 (11/94). During this time we did not
violate our NPDES limit of 44 ug/l, and would not have
violated the proposed limit of 38 ug/1 at "above 5.0 MGD".
(see attached data)
6. The City requests that the total residual chlorine limit
"above 5.0 MGD" be changed from 26.0 ug/1 to 150.0 ug/1
(December 1 - May 31) and to 50.0 ug/1 (June 1 - November 3 0) .
We have passed chronic bioassay tests with chlorine residuals
as high as 150.0 ug/1, and believe that this is an indication
that there is minimal impact on the stream at this level. (see
attached data)
7. The City requests that the total residual chlorine limit
"above 5.0 MGD" be changed from daily maximum to monthly.
average. We do not feel.' that a daily maximum chlorine
residual limit reasonably affects, or is a true indicator of,
the impact of chlorine on the stream. We feel that the amount
of chlorine residual that can be in the effluent, without
impacting the stream, varies from day to day depending on
environmental factors such as stream flow and amount of
sunshine.
Any questions concerning this request, please contact me or Dwight
Wilson, Sr. at 704-465-7400.
Sincerely,
Radford L. Thomas
City Manager
City of Newton

Results -of Effluent Cadmium Sampling
January, 1993 - April, 1995
Date...
R
Resu °
Date. _._
R
Results
Date .:
Result.
01/06/93
<0.
::
01/05/94
<0.5
01/04/95
01 /13/93
<0.5
.:
0
01/12/94
<0.5
01 /11 /95
<0.5
01/20/93
<0.5
01 /19/94
<0.5
0
01/18/95
<0.5
01/28/93
<0.5
01/26/94
0.6
01/25/95
<0.5
02/04/93
<0.5
'
02/02/94
<0.5
02/01/95
<0.5
02/11/93
<0.5
..'
0
02/09/94
<0.5
02/08/95
<0.5
02/18/93
<0.5
02/16/94
<0.5
02/15/95
<0.5
02/24/93
<0.5
02/23/94
<0.5
02/22/95
<0.5
03/03/93
<0.5
03/02/94
<0.5
:
03/01/95
<0.5 '
03/10/93
<0.5
103/09/94
<0.5
03/08/95
<0.5
03/17/93
<0.5
03/16/94
<0.5
!
03/15/95
<0.5
03/24/93
<0.5
03/23/94
<0.5
03/22/95
<0.5
03/31/93
<0.5
: ,
03/30/94
<0.5
03/29/95
<0.5
04/08/93
<0.5
04/06/94
<0.5
04/05/95
<0.5
04/15/93
<0.5
::04/13/94
2.6
04/12/95
<0.5
04/21/93
<0.5
"`
0
04/20/94
0.5
04/19/95
<0.5
04/28/93
<0.5
,
0
04/27/94
<0.5
04/26/95
<0.5
05/06/93
<0.5
05/04/94
<0.5
05/13/93
<0.5
:::
0
05/11/94
<0.5
05/20/93
<0.5
,
0
05/18/94
<0.5
05/26/93
<0.5
,
05/25/94
<0.5
06/02/93
<0.5
06/01/94
<0.5
06/09/93
<0.5
.:
06/08/94
<0.5
06/16/93
<0.5
06/09/94
<0.5
06/23/93
<0.5
0
06/15/94
<0.5
06/30/93
<0.5
06/22/94
<0.5
07/07/93
<0.5
'.
06/29/94
<0.5
07/14/93
<0.5
07/06/94
<0.5
07/21/93
<0.5
07/13/94
<0.5
07/28/93
<0.5
07/20/94
0.8
08/04/93
<0.5
07/27/94
<0.5
08/11/93
<0.5
:'''
08/03/94
<0.5
08/17/93
<0.5
08/10/94
<0.5
08/18/93
<0.5
"08/17/94
<0.5
08/19/93
<0.5
08/24/94
<0.5
08/25/95
<0.5
08/31/94
<0.5
09/01/93
<0.5
09/07/94
<0.5
09/08/93
<0.5
09/14/94
<0.5
09/15/93
<0.5
-
09/21/94
2.2
09/22/93
<0.5
::' ''.
09/28/94
<0.5
09/29/93
<0.5
1
10/05/94
<0.5
10/06/93
<0.5
1
10/12/94
<0.5
10/13/93
<0.5
1
10/19/94
<0.5
10/20/93
<0.5
10/26/94
<0.5
10/27/93
<0.5
1
11/02/94
<0.5
11/03/93
<0.5
j
1
11 /09/94
<0.5
11/09/93
<0.5
1
11/16/94
<0.5
11/17/93
<0.5
�"
1
11/21/94
<0.5
11/23/93
<0.5
1
11/30/94
<0.5
12/01/93
<0.5
1
12/07/94
<0.5
c ri :; .
12/07/93
<0.5
T2/14/94
<0.5
'
12/15/93
<0.5
1
12/21/94
<0.5
12/21 /93
<0.5
1
12/26/94
<0.5

Results of Effluent Lead Sampling
January, 1993 - April, 1995
01/06/93
esults::
Date irg/I)
01/13/93
<1
:Results:
(u il)
01 /05/94 1 <1
01/12/94
Date
01/04/95
01 /11 /95
°Results:
<5
01/20/93
<1
01/19/94
6
01/18/95
<5
01/28/93
<1
01/26/94
9
01/25/95
<5
02/04/93
<1
02/02/94
3
02/01/95
02/11 /93
<1
02/09/94
<5
02/08/95
<5
02/18/93
<1
02/16/94
<5
02/15/95
<5
02/24/93
<1
02/23/94
<5
02/22/95
<5
03/03/93
<1
03/02/94
<2
03/01/95
<5
03/10/93
<1
03/09/94
<5
03/08/95
<5
03/17/93
03/24/93
<1
<1
03/16/94
03/23/94
<5
2
03/15/95
03/22/95
<5
<5
03/31/93
<1
03/30/94
<2
03/29/95
<5
04/08/93
<1
04/06/94
<2
04/05/95
<5
04/15/93
2
04/13/94
3
04/12/95
<5
04/21/93
4
04/20/94
<5
04/19/95
<5
04/28/93
<1
04/27/94
<5
04/26/95
<5
05/06/93
<1
05/04/94
<5
05/13/93
1
05/11/94
<5
05/20/93
<1
05/18/94
<5
05/26/93
<1
05/25/94
<5
06/02/93
<1
06/01/94
<5
06/09/93
06/16/93
<1
1
06/08/94
06/09/94
<5
<5
06/23/93
<1
06/15/94
<5
06/30/93
<1
06/22/94
<5
07/07/93
<1
06/29/94
<5
07/14/93
<2
07/06/94
<5
07/21/93
<2
07/13/94
<5
07/28/93
27 x
07/20/94
<5
08/04/93
08/ 11 /93
3
07/27/94
<5
<1
08/03/94
<5
08/17/93
08/18/93
<5
08/10/94
<5
2
08/17/94
<5
08/19/93
4
08/24/94
<5
08/25/93
4
08/31/94
<5
09/01/93
2
09/07/94
<5
09/08/93
<5
09/14/94
<5
09/15/93
3
09/21/94
8
09/22/93
10
09/28/94
<5
09/29/93
1
10/05/94
<5
10/06/93
<10
10/12/94
<5
10/13/93
10/20/93
1
10/19/94
22
<5
10/26/94
<5
10/27/93
<10
11/02/94
<5
11/03/93
<5
11/09/94
<5
11/09/93
11/17/93
<5
11/16/94
<5
<5
11/21/94
36
11/23/93
<5
11/30/94
<5
12/01/93
12/07/93
8
<5
12/07/94
12/14/94
<5
<5
12/15/93
<5
12/21/94
<5
12/21/93
<5
12/28/94
6

Chlorine Residuals During Toxicity Sampling
Tests we passed.
In House
Date Average
BRI BRI
First Sample Second Sample
2/90
0.025
0.14
<0.1
4/90
0.1
0.15
<0.1
7/90
0.06
<0.1
<0.1
10/90
0.065
0.14
<0.1
3/91
0.085
<.05
<0.05
10/91
0.015
0.1
<0.1
11/91
0.015
<0.1
<0.1
12/91
0.035
0.1
<0.1
6/92
0.01
<0.1
<0.1
7/92
0.005
<0.05
<0.05
11/92
n/a
<0.05
<0.05
1/93
0.035
<0.05
<0.05
2/93
0.095
<0.05
<0.05
3/93
0.065
0.05
0.05
4/93
0.195
0.1
0.1
5/93
0.175
0.1
0.05
7/93
0.045
0.1
0.05
8/93
0.005
<0.05
<0.05
9/93
0.02
<0.05
<0.05
10/93
0.035
<0.05
<0.05
11/93
0.015
0.1
<0.05
12/93
0.045
<0.05
<0.05
3/94
0.08
0.05
0.05
6/94
0.025
0.1
0.05
9/94
0.035
<0.05
<0.05
12/94
0.03
<0.05
<0.05
3/95
0.15
0.15
n/a
total
1.465
avg.
< .06
< .08
< .07

Date
Fecals
Up
Stream
Fecals
Down
Stream
%
Change
Up
To
Down
Average
Chlorine
Residual
Estimated
Residual
For No
Change
In Fecals
Approximate
Effluent
Fecals
1/93
456
448
I 0.982
0.07
,
' 0.0688
110
2/93
788
918
1.165
0.06
0.0699
24
3/93
540
640
1.185
0.03
0.0356
37
4/93
913
991
1.085
0.13
0.1411
11
5/93 .
3588
2542
0.708
0.12
0.085
1
.. ;
2359
1913
0.811
*1:
0
0.0487
2
..... . "
2513
2431
0.967
-41�03
0
0.029
3
Ma ii,
2726
2814
1.032
003
0
0.031
11
' i. - • •
3021
2291
0.758
*:. ...
0
0.0228
10
1. 9/9.?ii
1178
859
0.729
0.04
0
0.0292
8
' ' • :. :'
.
1292
967
0.748
7"H " 1 "
0.0599
18
12/93
1408
1665
1.183
0.18
0.2129
11
1/94
639
579
0.906
0.31
0.2809
14
2/94
450
410
0.911
0.18
0.164
3
3/94
753
756
1 004
0.1
0.1004 ,
28
4/94
1450
1222
0.843
0.12
0.1011
3
5/94
1594
1652
1.036
0.049
0.0508
4
II
4
4387
4705
1.072
:.CL024
0.0257
2
,
4
4036
3936
0.975
tt 53
0
0.0293
3
8194
2700
2100
0.778 ;iii
036
0
0.028
4
.. 9114
3888
2376
0.611
*1:
0
0.0183
4
1(1.911
1341
1421
1.06
' *
0
0.0318
17
11194:
2384
2086
0.875
0046
0.0403
8
12/94
635
613
0.965
0.127
0.1226
17
1/95
909
955
' 1.051
0.255
0.2679
17
2/95
693
520
0.75
0.221
0.1658
54
3/95
661
702
1.062
0.145
0.154
37
4/95
870
895
1.029
0.156
0.1605
6
average
0.939
0.0971
0.0912