NC0025496_Instream Assessment_19820702

NPDES DOCUWENT SCANNING COVER SHEET
NPDES Permit:
NC0025496
Lincolnton WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Correspondence
Speculative Limits
am
Instream Assessment (67b)
Environmental Assessment (EA)
Permit
History
Document Date:
July 2, 1982
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MEMORANDUM
TO:
FROM:
DIVISION OF ENVIRONMENTAL MANAGEMENT
July 2, 1982
Dick Peace, Regional Supervisor
Mooresville Regional Office
Mark Lewis €&,4izJtt
Technical Servi es Unit
THRU: Forrest Westall, Head
Operations Branch
SUBJECT: Special Order by Consent
Lincolnton WWTP
Lincoln County
Summary and Conclusions
The Lincolnton WWTP discharges into the South Fork Catawba River,
which is classified as an "A -II" stream. The drainage area at the
discharge point is 400 mil yielding a 7Q10 of 92 cfs. The 30Q2 flow
was estimated to be double the 7Q10, and therefore is equal to 184 cfs.
The City of Lincolnton had previously requested a Special Order by
Consent (see attached September 4, 1980 memorandum); the EMC granted
Lincolnton's request. Under this Order Lincolnton has added 0.08 MGD
of domestic waste. Presently, Lincolnton is now requesting the
addition of 0.2 MGD metal plating waste originating from National Lock
Co. Several heavy metals and cyanide are expected from this waste flow.
An analysis has been completed analyzing the effect that these toxics
are likely to have on the South Fork Catawba River. With the addition
of the metal plating waste, the resulting in -stream concentrations of
toxics should still remain within applicable water quality standards.
Also for all toxics the increase in in -stream consentration above
present conditions should not be able to be detected by standard lab-
oratory methods.
Analysis and Methods
The City of Lincolnton is requesting the addition of 0.2 MGD of
metal plating waste from National Lock Co. The expected composition
of this waste with respect to toxics is described below:

Copper (Cu): 15 mg/1
Zinc (Zn): 10 mg/1
Cyanide (CN_ ): 2 mg/1
Nickel (Ni): 2 mg/1
Chromium (Cr): 2 mg/1
In order to assess the impact of these toxics, a mass balance
technique was used in order to compare the expected in -stream con-
centrations between present loadings and loadings anticipated with
the addition of the metal plating waste. The design flow criteria
used for toxics is the 30 day 2 year low flow (30Q2). A USGS estimate
for this parameter was not readily available.. Typically, the 30Q2 was
assumed to be 184 cfs since the 7Q10 is 92 cfs.
STORET data show that metal concentrations sampled from the South
Fork Catawba River at NC10 near Startown (about 15 mi. upstream from
the Lincolnton discharge) during 1981 and 1982 are at or below the
respective minimum detection limits. Thus, it is difficult to determine
precisely what the background concentrations of these metals in the river
are. Data from a sampling station located below Lincolnton's discharge
are also inconclusive. However, values of Zn in excess of 700 ug/1 were
recorded at this station. All of the data at this station were recorded
prior to 1975.
USGS has published estimates of background concentrations of metals
and cyanides. These values are very much lower than the state lab's
minimum detection levels.
For this analysis, two mass balances were calculated and the results
compared. The first set of calculations was done using the USGS "unpolluted
stream" background concentrations. The second set was performed using
minimum detection levels. For both sets, present effluent characteristics
for the Lincolnton WWTP were obtained from a sampling inspection conducted
by staff of the Mooresville Regional Office on June 30, 1981.
The attached table exhibits the relevant data described above as well
as the resulting in -stream concentrations with and without the addition of
the metal plating waste. It can be seen that the addition of the waste
is not expected to cause detectable violations of existing water quality
standards, regardless of the initial assumed background metals concentrations.
Also, the expected in -stream increase in toxics should not be detectable by
present laboratory techniques employed by DEM.
If you have any questions, please call.
ML/gh
cc: Arthur Mouberry

Present
Parameters Effluent
Value
(ug/1)
Cu
Zn
CN
Ni
Cr
Cu
Zn
CN
Ni
Cr
60b
100b
Ob
100b
50b
Present
Effluent
Value
(ug/1)
60b
100b
Ob
100b
50b
USGS
Background
Values
(ug/1)
4a
12a
Oa
Oa
13a
STORET
Background
Values
(ug/1)
40d
50d
0d
100d
50d
Table I
In -Stream
Value
Under
Present
Conditions
(ug/1)
5
14
0
2
14
In -Stream
Value
Under
Present
Conditions
(ug/1)
40.3
50.9
0
100
50
In -Stream
Value With
Addition of
National
Lock Co.
(ug/1)
30
30
3
5
17
In -Stream Detection
Water Quality Limit
Standard (ug/1)
(ug/1)
none
none
5.
100
50
40c
50c
40c
100c
50c
In -Stream In -Stream Detection
Value With Water Quality Limit
Addition of Standard (ug/1)
National (ug/1)
Lock Co.
(ug/1)
65
67
53
none.
none
5
100
50
a. Taken from USGS ambient stations in non -impacted watersheds
40c
50c
40c
100c
b. Data taken from a sampling inspection by Mooresville Regional Office
50c
c. Detection Limits reported by Cary Lab.
d. From Southfork Catawba River at NC10 near Startown, 1981-82 averages.

•
National
Lock Company
Upstream Conditioned
30Q2 - 184 cix
Cr = 0.013 mg/i
Cu = 0.004 mg/1
Ni = 0 mg/1
Zn = 0.012 mg/1
.CN-= 0 mg/1
Effluent Parametersa
Qw = 0.2 MGD
Chromium (Cr) = 2 mg/1
Copper (Cu) = 15 mg/1
Nickel (Ni) = 2 mg/1
Zinc (Zn) = 10 mg/1
Cyanide (CN-) = 2 mg/1
Lincolnton WWTP
present effluent projected effluent 'threshold concentra-,
varametersb parameters with tions inhibitory tc
addition of National aerobic biological
Lock Company treatment processc
= 2.1 MGD
Cr = 0.050 mg/1*
Cu = 0.060 mg/1
11 = 0.10 mg/1*
Zn = 0.10 mg/1
'CN-= 0 mg/1*
Qw = 2.3 MGD
Cr = 0.22 mg/1
Cu = 1.36 mg/1
Ni = 0.265 mg/1
Zn = 0.96 mg/1
CN-= 0.174 mg/1
Cr - 1-10 mg/1
Cu = 1.0 mg/1
Ni = 1-2.5 mg/1
Zn = 0.08-10 mg/1
CN-= 0.1-5 mg/1
Cr = 0.014 mg/1
Cu = 0.005 mg/1
Ni = 0.002 mg/1
Zn = 0.014 mg/1
CN-= 0 mg/1
r1
•In -Stream Values at Mix Point
present in -stream projected in -stream value in -stream water quality (WQ) standards
value with addition of National and limits of detection
Lock Company WQ standard limit of detection
Cr = 0.017 mg/1
Cu = 0.030 mg/1
Ni = 0.005 mg/1
Zn = 0.030 mg/1
CN-= 0.003 mg/1
Cr = 0.05 mg/1
Cu = none
Ni = 0.1 mg/1
Zn = none
CN-= 0.005 mg/1
Cr = 0.050 mg/1
Cu = 0.040 mg/1
Ni = 0.100 mg/1
Zn = 0.050 mg/1
CN-= 0.040 mg/1

National
Lock Company
Effluent Parametersa
Qw = 0.2 MGD
Chromium (Cr) = 2 mg/1
Copper (Cu) = 15 mg/1
[nickel (Ni) = 2 mg/1
Zinc (Zn) = 10 mg/1
Cyanide (CN-) = 2 mg/1
Jpstream Conditionsd
0Q2 = 184 cfs
r = 0.013 mg/1
u := 0.004 mg/1
i-= 0 mg/1
'n = 0.012 mg/1
:N 0 mg/1
Lincolnton WWTP
present effluent
parametersb
;?w = 2.1 MGD
Cr = 0.050 mg/1
Cu = 0.060 mg/1
Ni = 0.10 mg/1
Zn = 0.10 mg/1
'CN-= 0 mg/1
projected effluent
parameters with
addition of National
Lock Company
Qw = 2.3 MGD
Cr = 0.22 mg/1
Cu = 1.36 mg/1
Ni = 0.265 mg/1
Zn = 0.96 mg/1
CN-= 0.174 mg/1
threshold concentrr
tions inhibitory t
aerobic biological
treatment processc
Cr = 1-10 mg/1
Cu = 1.0 mg/1
Ni = 1-2.5 mg/1
Zn = 0.08-10 mg/1
CN-= 0.1-5 mg/1
=In -Stream Values az Mix Point
present in -stream
value
Cr = 0.014 mg/1
Cu = 0.005 mg/1
Ni = 0.002 mg/1
Zn = 0.014 mg/1
CN-= 0 mg/1
projected in -stream value in -stream water qual t;.y (WQ) standards
with addition of National and limits of detection
WQ standard - limit of detection
Lock Company
Cr.=
Cu =
Ni =
Zn =
CN-=
0.017 mg/1
0.030 mg/1
0.005 mg/1
0.030 mg/1
0.003 mg/1
Cr = 0.05 mg/1 Cr = 0.050 mg/1
.Cu = none Cu = 0.040' mg/1 .-
Ni = 0.1 mg/1 Ni = 0.100 mg/1
Zn = none Zn = 0.050 mg/1
CN-= 0.005 mg/1 ry CN-= 0.040 mg/1

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