NC0023736_Wasteload Allocation_19891120

NPDES DOCUMENT SCANNING COVER SHEET
NC0023736
Gunpowder Creek WWTP
NPDES Permit:
Document Type:
Permit Issuance
asteload Allocation '
,.„,,,,,..44-„...:„..,..40,
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
November 20, 1989
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NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0023736
FACILITY NAME: City of Lenoir -Gunpowder Creek WWTP
Facility Status: Existing
Permit Status: Renewal
Major .\1 Minor
Pipe No.: 001
Design Capacity: 1.0 MGD
Domestic (% of Flow): 80
Industrial (% of Flow): 20 %
Comments:
RECEIVING STREAM:
Class: C
PLOTTE
Gunpowder Creek
Sub -Basin: 03-08-32
Reference USGS Quad: D13SW (please attach)
County: Caldwell
Regional Office: Mooresville Regional Office
Requested by:
Prepared by: ./
Reviewed b
Date: 8/16/89
Date: /%2s%8y
Date: 70/c2S7gS
Modeler
Date Rec.
#
z"MNJ
81«1 g9
537 0
Drainage Area (mi2 ) J. G Avg. Streamflow (cfs): /8 0
7Q10 (cfs) .2. 9 Winter 7Q10 (cfs) 3. 9 30Q2 (cfs) -S7 Z
Toxicity Limits: IWC - % Acute�hronic2
Instream Monitoring:
Parameters T w.•� -,1) o /4,4
Upstream Y Location .Z 4,4 /fv p 6.1.w cr. i.y.ue)
Downstream Y Location J ra09 Ob.;
Effluent
Characteristics
rn o i. A lr-e. .
Oti. v'I / •
BOD2 (mg/1)
30
NH3-N (mg/1)
N/
D.O. (mg/1)
S
TSS (mg/1)
3 0
F. Col. (/100 ml)
Zoo
pH (SU)
b
c
/9g. o la (11)
�c
.253 vs ( c i )
2.
72 la (w4)
.. ,:.k
/ 4 u f/.P (W 9
Comments: ,ox,.t.,�
4ef--0.-v�-

RECEIVED
WASTELOAD ALLOCA'9g0N1
Facility Name:
NPDES No.:
Type of Waste:
Status:
Receiving Stream:
Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Quad:
AM{SMON OF ENVIRONMENTAL MAM8ELEiI
��qq��qq Request No.: 5378
FROVAL FORM
MODRESmA
LENOIR-GUNPOWiD@R SEEK WWTP
NC0023736
80% DOMESTIC / 20% INDUSTRIAL
EXISTING RENELJ4i_
GUNPOWDER CREEK
C
030832 Drainage area: 12.600 sq mi
CALDWELL Summer 7Q10: 2.90 cfs
MR0 Winter 7Q10: 3.90 cfs
HARRIS Average flow: 18.00 cfs
8/17/89 30Q2: 5.20 cfs
D13SW
RECOMMENDED EFFLUENT LIMITS
Wasteflow (mgd) :
BOD5 (mg/1) :
NH3N (mg/1) :
DO (mg/1) :
TSS (mg/1) :
Fecal coliform (#/100m1) :
pH (su) :
*Cadmium (ug/1) :
* (w cim i7r
Toxicity Testing Req.:
Upstream (Y/N): Y
Downstream (Y/N): Y
RECOMMENDED
MO.AVG.DA.MAX.
1.00 Chromium (ug/1) :
30 *Nickel (ug/1) :
NR *Lead (ug/1) :
5 *Cyanide (ug/1) :
30
200
6-9
5.7(wQ)
CHRONIC/ CERIODAPHNIA
MONITORING
Location:
Location:
COMMENTS
RECOMMEND EFFLUENT MONITORING FOR
RECOMMEND CONTINUATION ON MONTHLY
TOXICITY REQUIREMENT ATTACHED.
RECOMMEND INSTREAM MONITORING FOR
DUCTIVITY.
DA. MAX.
144 (wp)
253 (w9)
72 049)
14 (609)
0 C I ti 0 989
PA_} 9i, , ',,, ,,,,-_
:i}Sr.
SR1809 (APPROX. 0.8 MI. UPS OF OUTFALL
SR1809 (APPROX. 1.1 DWNSTRM OF OUTFALL
COPPER, ZINC, AND SILVER.
EFFLUENT MONITORING FOR TN AND TP.
TEMPERATURE, DO, FECAL COLIFORM, AND CON -
Recommended by:
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineering:
RETURN TO TECHNICAL SERVICES BY:
.„„te
00)-det 22040,Wv2-6-Y1-11-5
NOV 15 1989
Date: 2704...
/ /
Date:
Date:

SI89
Facility Name ,ZfAidr'
SO
,vcob
4'40-7761 Permit # .23 73 G
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 *June 1988) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or
significant mortality is 36 % (defined as treatment two in the North Carolina procedure
document). The permit holder shall perform quarterly monitoring using this procedure to establish
compliance with the permit condition. The first test will be performed after thirty days from
issuance of this permit during the months of ,lld,e ,IVA/ Selo Xt. . Effluent
sampling for this testing shall be performed at the NPDES permitted 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 was performed, using the parameter
code TGP3B. Additionally, DEM Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
P.O. Box 27687
Raleigh, N.C. 27611
Test data shall be complete and accurate and include 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 stream, this
permit may be re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and appropriate environmental controls, shall constitute an invalid test
and will require immediate retesting(within 30 days of initial monitoring event). Failure to submit
suitable test results will constitute noncompliance with monitoring requirements.
7Q10 1.9 cfs
Permuted Flow /. o MGD
I\VC% .
Basin & Sub -basin C7B 3
Receiving Stream 61vraw (-eta-
County Ce/1ws//
Recommended by:
At -
to
. 7 /71
**Chronic Toxicity (Ceriodaphnia) P/F at 3s %,/lfrig 450o ,CG , See Part 3 , Condition r2.

PRETREATMENT HEADWORKS REVIEW v2.0 (1/9/89)
Discharger:
Receiving stream:
Stream Class:
7Q10:
Design flow:
Actual flow:
Percent industrial:
IWC:
LENOIR-GUNPOWDER CREEK WWTP
GUNPOWDER CREEK
C
2.900 cfs
1.000 mgd
0.8141 mgd
20.00%%
34.8 %
Pollutant Standard/AL Removal
(mg/1) Eff.
Cadmium
Chromium
Copper
Nickel
Lead
Zinc
Cyanide
Mercury
Silver
Cadmium
Chromium
Copper
Nickel
Lead
Zinc
Cyanide
Mercury
Silver
0.002 S
0.05 S
0.007 AL
0.088 S
0.025 S
0.05 AL
0.005 S
0 000012 S
0.05 AL
Total
Influent
Load
(lbs/day)
0.18
1.14
1.38
1.59
0.32
1.14
0.44
0.00
0.19
92%
89%
90%
39%
81%
84%
59%
86%
94%
Actual
Allowable Domestic
Load Load
(lbs/day) (lbs/day)
0.56
10.19
1.57
3.24
2.95
7.01
0.27
0.00
18.69
Background
Reserve Conc
(lbs/day) (mg/1)
0.38
9.05
0.19
1.64
2.64
5.87
-0.17
0.00
18.50
0.010
0.004
0.004
0.004
0.025
0.150
0.010
0.000
0.025
Predicted
Effluent
Conc
(mg/1)
0 0.0021 L
0 0.0185 L
0 0.0204 M
0 0.1431 L
0 0.0088 L
0 0.0268 M
0 0.0266 L
0 0.0000
0 0.0016 M
09/26/89
Actual
Industrial
Load
(lbs/day)
0.170
1.140
1.380
1.590
0.290
0.990
0.430
0.000
0.160
Allowable
Effluent
Conc
(mg/1)
0.0057
0.1435
0.0201
0.2526
0.0718
0.1435
0.0144
0.0000
0.1435
J

DIVISION OF ENVIRONMENTAL MANAGEMENT
October 19, 1989
MEMORANDUM
TO: Rex Gleason
THROUGH: Trevor Clements��
FROM: Ru afitnek C.3
SUBJECT: Lenoir -Gunpowder Creek WWTP
Ammonia Toxicity
NPDES Permit No. NC0023736
Caldwell County
The wasteload allocation approval form for the above facility
was recently completed by this office. The facility received its
existing BOD5 (30 mg/1) and ammonia limits (no limit) per Division
procedure since no DO violations have been observed instream. How-
ever, EPA may not approve the permit due to possible ammonia toxic-
ity. Our usua L 1:e_ponsc to Y.2A in this ma. to i,_ that th
effluent toxicity test will monitor any problems caused by ammonia.
However, EPA may not accept this rationale for the Gunpowder Creek
WWTP since toxicity has already been observed. DEM performed a 168
hour Ceriodaphnia reproduction suppression chronic toxicity test on
June 14, 1988, and the result was a failure. The facility reported
LC50 concentrations of 17.7 and 35.2 in June and July, 1989 while
the instream waste concentration is 34.8. Therefore, DEM will
require the facility to determine if ammonia is causing toxicity
problems if Lenoir fails its future toxicity tests. If it is
determined that ammonia is the cause, DEM will either: (1) require
the facility to reduce effluent concentrations enough to eliminate
the toxicity problem or (2) reopen the permit to incorporate
ammonia limits. A standard Division procedure has not yet been
established for eliminating ammonia toxicity in facilities like the
Lenoir plant. This issue should be addressed in the near future.
If you have any questions, please call Trevor Clements or me
at [phone].
cc: Larry Ausley
Central Files

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TNsTREAM SELF-MONITONG DATA
MONTHLY AVERAGZS
Discharcer: Cuz-tA. c.E..rjr
Reciving Strem: tpL
Upstream Location: sg /61/09
permit No.: NCOo =23736
Sub -basin: 030f32_
Downstream Location s,e6rd9
Ulpstream Downstream,
DATE mEM12 r, , 0 . BOD5 COND TEMP D.O. BOD5 COND
D E C - f-, 9
NOV
O C i.' -8
q7°
JUL-89 •Fc!, 9. e , / :2-0:-.1- 7f
air: 272 7, 6
MAY -89 La. 9.7 . /2., 9. 2-
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AUG- 88 024 y a, /
JUL -88 c74 / i. / 924./ Z /
JUN-88 ___--& fif/3
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MAY -88
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APR-82 /A 3 9,3 47 1.e
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FEB88
MAR -88
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DEC-87 6.6 .---)57 6.7
NO V - 87 /76.3r 9: 7 : -?-7;5--- ---1:5
OCT -87 _____
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