NC0043532_Wasteload Allocation_19910926

NPDES DOCUMENT SCANNINL COVER :MEET
NPDES Permit:
NC0043532
West Stanly / Oakboro WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
September 26, 1991
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September 26, 1991
MEMORANDUM
TO: Dale Overcash
Permits and Engineering
FROM: Betsy Johnson
Technical Sup
THROUGH: Mike Scoville MP
Ruth Swanek 'RcS
Subject: Town of Oakboro metals limits.
NPDES No. NC0043532
Stanly County
The Town has requested removal of metals testing from the permit requirements. The
submitted data do not support dropping the monitoring requirements for all metals. Since
chromium and lead appear at insignificant levels, the limits should be dropped and replaced
with quarterly monitoring to be done in conjunction with the toxicity tests. The silver
monitoring requirement should be dropped since it has not been detected. Cadmium,
nickel, and cyanide have been detected at levels within 1/lOth of the allowable
concentration and should remain as permitted. Copper and zinc should also be monitored
as permitted.
In summary,
limit frequency
Cadmium 11 ug/1 2/month
Nickel . a,,-A9-- 463 ug/1 2/month
26* ug/1 2/month
Copper monitor monthly
Zinc monitor monthly
Chromium monitor quarterly*
Lead monitor quarterly*
* quarterly tests should be done in conjunction with toxicity testing.
If you have any questions, let me know.
cc: Mooresville Regional Office
Central Files

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WK
DICKSON
August 29, 1991
N. C. Department of Environment,
Health and Natural Resources
Division of Environmental Management
P. O. Box 29535
Raleigh, North Carolina 27626-0535
Attention: Mr. Donald L. Safrit, Supervisor
Permits and Engineering Unit
rn
Re: Permit Modification
NC0043532 - Town of Oakboro
WKD # 91155.11 I --n
rn
On behalf of the Town of Oakboro, we are requesting removal of the
metals testing from the Town's wastewater treatment plant NPDES permit.
Enclosed are historical results of metals testing at the plant effluent stream from
January 1990 to May 1991. Most of the samples reflect values below the
maximum limits set for the effluent stream. Upstream and downstream sampling
also show no significant effect on the stream from the plant discharge.
Gentlemen:
We appreciate your consideration of this request. Please advise if
additional information is needed.
Sincerely,
W. K. DICKSON & CO., INC.
/NI: alit_
M. L. Wolfe
Enclosure
cc: Larry Branch
Mooresville Regional Office

-
EFFLUENT MONITORING RESULTS
OAKBORW WASTEWATER TREATMENT PLANT
TOWN OF OAKBORO
EFFLUENT CHARACTERISTICS:
AY.Y Vf 1 ',, vw.'AY,YA♦•nV,{•YV.W. .• .Y �,1N•N •,tv� v� fhV,Y.:Y.1� 1Y :Y 1:VAY.Y.L ��� + 1Yht 1'.1Y ' YfhY Y,',',1Y. !i 1�Yf • Yt,YAYff.Y' •.� vn�•.�n
..Y}'�f�ryJA•.':'JflflJ.•f�Y.'1JY.L�.:'}.YJ•J4�•.:�h:':f.•ff:f.V.:h'f,',Y,ti.ff:.M1•:.:::ti1l:.Yfl:?V::XhYf'1MYNIi Wifh,X.•.Y.•.Jf,:�LS:Y.VffhV,�1'f•:W,1Y.�}h': ,��f V. h•�:'::'.':J.VN:J:::'J:tVT:•:•:::•::•:ti•::•::fJf.•.':VIf:•:fhh JN.•.VJf f.VGffJJ}}ff::M•,Y,V}f�X.WNfNY.YXlfY.�
CADMIUM CHROMIUM NICKEL LEAD CYANIDE •SILVER COPPER ZINC
Jan-90
Feb-90
Mar-90
Apr-90
May-90
Jun-90
JuI-90
Aug-90
Sep-90
Oct-90
Nov-90
Dec-90
Jan-91
Feb-91
Mar-91
Apr-91
May-91
MDL
MAX LIMIT 0.011 0.263 0.463 0.131
0.005 ND 0.326 0.039
0.005 ND 0.331 0.029
0.006 ND 0.231 0.065
ND ND 0.158 0.047
0.008 ND 0.127 0.047
ND ND 0.492 0.071
0.197 ND 0.046 0.042
ND ND 0.140 0.067
0.101 ND 0.266 0.071
0.006 ND 0.172 0.011
0.007 ND 0.108 0.058
0.004 ND 0.057 0.040
ND ND 0.014 0.047
ND ND 0.195 0.038
0.003 ND 0.263 0.023
0.010 ND 0.286 0.103-
0.016 ND 0.187 0.046
0.001 0.010 0.010 0.005 0.005 4, 0.010 0.010 0.010
STREAM CHARACTERISTICS:
...::.:.:.:............:::::.:.:::
UPSTREAM -
SAMPLE DATE
19-JuI-91 ND ND ND 0.014 - 0.002 0.025 ND
22-JuI-91 ND ND ND ND - 0.002 0.025 0.002
DOWNSTREAM -
SAMPLE DATE
19-JuI-91 ND ND ND ND - ND 0.048 ND
22-JuI-91 ND ND ND ND - ND 0.026 ND
Notes: Shaded values are below Max. limit set for effluent
MDL = Method Detection Level
All units are in mg/I
W. K. Dickson & Co., Inc.

DIVISION OF ENVIRONMENTAL MANAGEMENT
April(4,j 1991
MEMORANDUM:
TO: Dale Overcash
Permits and Engineering
FROM: Betsy Johnson
Technical Support Branch
THROUGH: Mike Scoville
Ruth Swanek
SUBJECT: Clean Water pat letter regarding Carolina Solite's draft permit.
NPDES No. NC0028687
Stanly County
I have reviewed the Clean Water Fund's letter commenting on Carolina
Solite's draft NPDES permit. I offer the following responses:
1. Carolina Solite's waste is hazardous and should be permitted as such.
�v rJ
r'J 0
I agree that this is a hazard us waste incinerator and should be `{\t` ��'�
permitted by the Hazardous Waste � �. However, under current states 0�}`\ .•�2
laws,Carolina Solite is not required to obtain such a `�� qu' permit. I suggest ;
the Clean Water Fund lobby for a change to this law.
2. Weekly monitoring for VOC's.
Looking at past data, we have no basis for this requirement. A
quarterly priority pollutant analysis will be required.
3. The proposed permit conflicts with the SOC requirements.
The SOC requirements supercede the permit for the duration of the
SOC. The permit will not go into effect until the SOC expires.
4. Effluent limits for Lead, Fluoride, Cadmium, and Cyanide.
The limits for these constituents were derived taking Oakboro's
discharge into account. While the limits allow the use oL a large portion
of :he river's assimilative capacity, the state currently has no policy
for restricting allocations. However, the permit will be re-examined in
1994 when the permit must be renewed under the state's new basin planning
schedule and, a basin -wide allocation will be done in 1999 when the Yadkin
River Basin management strategy is implemented.
5. Quarterly Priority Pollutant Analysis.
A requirement for quarterly priority pollutant analysis should have
been included in the permit. This was an oversight by DEM. The permit
will be amended to include this requirement.