NC0023892_Wasteload Allocation_19900718

Vzl,,4
DIVISION OF ENVIRON"'^"^I\T MANAGEMENT
July 18, 1990
MEMORANDUM
TO: Trevor Clements
FROM: Carla -Sanderson
Ruth Swanek'ZCS
SUBJECT: City of Salisbury
Grants Creek WWTP
Town Creek WWTP -
- NC0023884 - Rowan County
NC0023892 - Rowan County
We have compiled the information for your meeting with the
City of Salisbury. The front pages of the most recent wasteload
allocations (Attachments 1 and 2) are attached for each facility
along with compliance data (Attachments 3 and 4) from the past
year. Other information pertaining to the two facilities is as
follows:
7010
The 7Q10 flow estimate for the Grants Creek WWTP was high in
the last allocation. Updated flow estimates at the mouth of Grants
Creek indicate that the flow is 5.9 cfs. The 7Q10 flow at the
outfall is probably closer to 5.8 cfs than the 6.7 cfs used in the
last WLA. The winter 7Q10 flow is approximately 12.4 cfs.
The 7Q10 estimate of 1.4 cfs for the Town Creek WWTP appeared
to be adequate.
Oxygen Demanding Wastes
The BODS and NH3-N limits assigned to both WWTPs may be high
since they were based on the old Level B model. In addition, the
CBOD:BODS ratios used in each allocation were too low. Long term
BOD data indicate that ratios of 3.7 and 3.3 are appropriate for
the Grants Creek and Town Creek facilities respectively.
ToxiCS
Updated PIRF forms (7/11/90) for both facilities indicate the
following new and additional limits for toxics:
Grants Creek
WWTP
(See
chromium
75.0
ug/1
cyanide
7.5
ug/1
mercury
0.018
ug/1
Attachment 5)
(new additional limit)
(new additional limit)
(new additional limit)

copper 10.0 ug/1 (change from 1.02 #/d limit (16ug/1))
zinc 75.0 ug/1 (change from 3.46 #/d limit (55ug/1))
lead 37.0 ug/1 (change from 1.75 #/d limit (28ug/1))
monitor for silver and aluminum
The current permit has limits for copper and zinc with no 6�0
indication in the WLA notes of why these limits were given..,- 1i°
Town Creek WWTP (See Attachment 6)
cadmium
2.4
ug/1
(new additional limit)
cyanide
5.9
ug/1
(new additional
limit)
mercury
0.014
ug/1
(new additional
limit)
chromium
59.0
ug/l
(change from 57
ug/1)
nickel
104.0
ug/1
(change from 60
ug/1)
lead
30.0
ug/1
(change from 36
ug/1)
monitor for copper, zinc, and silver
Both facilities have been performing chronic toxicity tests
since 1988. The Town Creek facility has passed each of its tests
except the initial one in September, 1988. Six other tests have
been submitted since that date.
The Grants Creek facility has been doing chronic tests since
March 1988 by administrative letter at a concentration of 610. The
updated USGS flows indicate that a IWC of 67% is more appropriate,
and this change should be noted upon permit renewal. The Grants
Creek facility has passed each of its chronic tests since December
1988 (6 tests submitted). Prior to that'the facility had failed
three tests and passed one.
Neither facility meets the ammonia criteria in its permit, but
due to the results of the toxicity tests, no limit will be added at
this time. The summer (winter) limits needed at the Grants Creek
and Town Creek facilities are 1.4 mg/l (3.5 mg/1) and 1.1 mg/1 (2.0
mg/1) respectively.
Finally, both facilities would need chlorine limits to meet
the State's action level. At their current design flows, the
Grants Creek and Town Creek facilities would need to meet 25 ug/1
and 20 ug/l in their effluent. The DMR sheets indicate that both
effluents are well above these concentrations.
Eutrophication
A nutrient sampling plan was initiated last summer on High
Rock Lake (see Attachment 7 for sampling locations). Precipitation
and flow data indicate that last summer's flows were above average -
(Attachment 8), and nutrient concentrations may be more severe
under lower flow conditions. Despite the high flows, the data
indicate that high nutrient concentrations occur in the Town Creek
arm of High Rock Lake (Attachment 9), and nutrient management plans
should be implemented on that arm of the lake. Therefore, Salis-
bury should expect nutrient limits for its Town Creek facility upon
permit renewal. Violations of the chlorophyll a standard occurred

in every arm of the lake, and in all but one main lake station
(Attachment 10) .
The AGPT data (Attachment 11) indicate that there is potential
for algal blooms, but the results are much lower than those seen
in the arms of Falls Lake. The high flows last year may have
flushed nutrients through the system quickly, and three sites are
being sampled again this summer for comparison with a lower flow
year.
Grants Creek Study 1986
An intensive water quality survey of Grants Creek from the
Salisbury WWTP outfall to the mouth of Grants Creek (total distance
= 1 mile) was conducted in August, 1989 (see attached). The time
of travel dye study produced a traveling time of 4.33 hours. The
attached report has highlighted areas which may be of concern for
review of the creek's conditions. There was no indication of D.O.
problems during the study, but substantial nutrient loading to the
creek which was mostly contibuted by the Spencer WWTP (effluent
levels at 11 mg/1 NH3N & 6 mg/1 P.

0-1/17/90 ' ver 3.1
Facility
NPDES Permit No.
Status (E, P, or M)
Permitted Flow
Actual Average Flow
Subbasin
Receiving Stream
Stream Classification
7Q10
IWC
Stn' d / Bkg
Pollutant AL Conc
(ug/1) (ug/1
Cadmium S
Chromium S
Copper AL
Nickel S
Lead S
Zinc AL
Cyanide S
Mercury S
Silver AL
Selenium S
Arsenic S
Phenols S
NH3-N C
T.R.Chlor.AL
Pollutant
Cadmium S
Chromium S
Copper AL
Nickel S
Lead S
Zinc AL
Cyanide S
Mercury S
Silver AL
Selenium S
Arsenic S
Phenols S
NH3-N C
T.R.Chlor.AL
2.0
50.0
7.0
88.0
25.0
50.0
5.0
0.012
0.06
5.00
50.00
NA
17.0
T O X I C S R E V I E W
Grants Creek WWTP
NC0023884
E
7.5 mgd
3.9 mgd
'030704
Grants Creek I--------- PRETREATMENT DATA -------------- 1----EFLLUENT DATA---- I
C I ACTUAL PERMITTEDI I
5.8 cfs I Ind. + Ind. + I FREQUENCY I
66.71 i I Domestic PERMITTED Domestic I OBSERVED of Chronicl
l Removal Domestic Act.Ind. Total Industrial Total I Eflluent Criteria 1
I Eff. Load Load Load Load Load I Conc. Violations)
I It (#/d) (#/d) (#/d) (#/d) (#/d) I (ug/1) (#vio/#sam)l
-- I -------- -------- --------------------------------- I -------- --------- I
I 92t 0.0 0.0 0.04 0.0 0.059 I I
l 769a 0.0 0.1 0.14 1.0 1.030 I 1 1
l 823 1.0 0.1 1.08 0.7 1.700 I 780.0 1 N
l 3294 0.0 0.1 0.11 0.3 0.360 I I P
I 81, 0.3 0.0 0.38 0.7 1.010 I 10.0 l U
l 77% 4.5 0.4 4.85 1.5 5.900 I 870.0 l T
l 598 1.4 0.0 1.43 0.0 1.423 I I
i 8694 0.0 0.0 0.03 0.1 0.080 I I S
I 90 0.2 0.0 0.17 0.1 0.264 1 I E
i 0• 0.00 I I C
I of I I T
l 89% 0.1 0.09 0.4 0.380 I I 1
I 0P4 I I O
i 0, I 3,000.0 1 N
I I 1
I I I
I I I
---- ALLOWABLE PRDCT'D PRDCT'D PRDCT'D--------- MONITOR/LIMIT --------- 1--ADTN'L RECMMDTN'S--
Effluent Effluent Effluent Instream I Recomm'd
Conc. using using Conc. Based on Based on Based on 1 FREQUENCY INSTREAM
Allowable
CHRONIC
ACTUAL
PERMIT
using
ACTUAL
PERMITTED
OBSERVED I
Eff. Mon. Monitor.
Load
Criteria Influent
Influent
OBSERVED
Influent
Influent
Effluent I
based on
Recomm'd ?
(#/d)
(ug/1)
(ug/1)
(ug/1)
--------
(ug/1)
--------
Loading
--------
Loading
--------
Data I
---------I
OBSERVED
---------
(YES/NO)
--------
---------
1.59
-----------------
2.998
0.098
0.145
0.00
Monitor
Monitor
I
13.29
74.946
1.033
7.601
0.00
Monitor
Limit
I
2.48
10.492
5.994
9.409
520.37
Monitor
Monitor
Monitor I
Weekly
YES
8.25
131.905
2.363
7.528
0.00
Monitor
Monitor
l
8.39
37.473
2.203
5.901
6.67
Monitor
Limit
Limit I
NCAC
NO
13.87
74.946
34.301
41.728
580.42
Monitor
Monitor
Monitor I
Weekly
YES
0.78
7.495
17.966
17.940
0.00
Limit
Limit
I
0.01
0.018
0.129
0.344
0.00
Limit
Limit
l
0.06
0.090
0.315
0.487
0.00
Monitor
Monitor
I
0.32
7.495
0.000
0.000
0.00
I
3.19
74.946
0.000
0.000
0.00
I
0.000
0.304
1.285
0.00
Limit
Limit
I
0.000
0.00
l
25.482
2001.43
Sendltt'rl
I
I
NCAC
YES
,,ti(-}s ,o X�O� C,) Z , P b ant c� #/d -
1il (,l) 0( d (,ke ta' �'� tz�✓ ( veNv�,�uvr, �a,w;G�, oL h'ltIt"

I
FACILITY NAME:
i
i
i REQUESTER : —
DATE: _/_�L/ 70 REGION:
This facility has no SIUs and should not have pretreatment language.
This facility should and/or is developing a pretreatment program.
Please include the following conditions:
This facility is currently implementing a
Please include the following conditions:
SIGNIFICANT INDUSTRIAL USERS'. (SIUs) OON'IRIBU'I'IONS
Program Development
Phase I due
Phase II due /
_ Additional Conditions
(attached)
pretreatment program.
Program Implementation
Additional Conditions
(attached)
SIU F a4
- TOTAL:
i
nMPOS ITICN :
TE5CTILE :
0. 0 K;D
METAL FINISHIA'G :
U p 5
MSD
o i.tier
0,07e)
MCD
�,aC,
d.0ab
MGD
tn)
HE7atiURKS REVIEW
' PARAM6'I'gZ
Ss TNaou"'H—DAILY MAD IN LBS/DAY
—
�AISOMLE
DCMESI'IC
PF 1I'I'IID
UAL
AC�
% �Q6l►►n{/AL
Cd
(0
03
m. oaf
o.o/o
Cr
t
0,0
,v
0./
Cu
Ni
1,03
O, 6
0,OS3
_
10.D3
0,03
r�, .33
,o Er 3
3 z i
Pb
3by, ay
0 3,
zn
--
�• Y S
/ I
o. yo
?
CN
Off_
01 OA
_
Ste-
Phenol
' OtherAi-
9' 3 g
0
ti
6,03
D.ds
o
'
,00
/�
-
$'lo
* Sewer U r o rdi n.�.L� alb
RECEIVED:
/ / REVIEWED BY : Rb'ITJ
i

A4h,r,hmcr* t,
07/17/90 ver 3.1
Facility:
NPDES Permit No.:
Status (E, P, or M) :
Permitted Flow:
Actual Average Flow:
Subbasin:
Receiving Stream:
Stream Classification:
7Q10:
IWC:
Stn'd / Bkg
Pollutant AL Conc.
(ug/1) (ug/1)
---------
Cadmium
-- --------
S
2.0
Chromium
S
50.0
Copper
AL
7.0
Nickel
S
88.0
Lead
S
25.0
Zinc
AL
50.0
Cyanide
S
5.0
Mercury
S
0.012
Silver
AL
0.06
Selenium
S
5.00
Arsenic
S
50.00
Phenols
S
NA
NH3-N
C
T.R.Chlor.AL
17.0
T O X I C S R E V I E W
Town Creek WWTP
NC0023892
E
5.0 mgd
3.4 mgd
'030704
Town Creek
I ---------
PRETREATMENT DATA -------------- I ---- EFLLUENT
DATA---- I
C
I
ACTUAL
PERMITTEDI
I
1.4 cfs
I
Ind. +
Ind. + I
FREQUENCY 1
84.70 %
I
Domestic
PERMITTED
Domestic I
OBSERVED
of Chronic[
1 Removal Domestic
Act.Ind.
Total
Industrial
Total I
Eflluent
Criteria I
1 Eff.
Load
Load
Load
Load
Load I
Conc.
Violationsl
1 is
(#/d)
(#/d)
(#/d)
(#/d)
(#/d) I
(ug/1)
--------
(#vio/#sam)l
--------- I
I-------- --------
I 92%
0.0
--------
0.0
--------
0.03
---------
0.1
-------- I
0.146 I
25.0
I
1 76%
0.1
0.3
0.45
6.2
6.300 1
57.0
I
I
1 82%
0.4
0.7
1.14
4.1
4.510 I
130.0
I
N
I 32%
0.0
0.0
0.05
2.0
2.050 I
35.8
I
P
I 81%
0.0
0.1
0.12
4.1
4.090 I
41.0
I
U
77%
1.8
2.9
4.72
8.8
10.680 I
136.0
I
T
1 59%
0.0
0.0
0.01
0.1
0.140 I
20.0
I
1 86%
0.4
0.0
0.41
0.4
0.820 I
I
S
I 94%
0.7
0.0
0.69
0.7
1.360 I
I
E
1 0%
I
I
C
1 0%
I
I
T
06
I
I
I
I 09,
I
I
0
0%
I
I
1
I
I
I
I
7,400.0
I
I
I
I
N
1---------------
ALLOWABLE
PRDCT'D
PRDCT'D
PRDCT'D
--------- MONITOR/LIMIT--------- 1--ADTN L RECMMDTN S--
Effluent
Effluent
Effluent
Instream
I
Recomm'd
Conc,
using
using
Conc.
Based on
Based on
Based on I
FREQUENCY
INSTREAM
I Allowable
CHRONIC
ACTUAL
PERMIT
using
ACTUAL
PERMITTED
OBSERVED I
Eff. Mon.
Monitor.
Pollutant
I Load
Criteria
Influent
Influent
OBSERVED
Influent
Influent
Effluent I
based on
Recomm'd ?
1 (#/d)
(ug/1)
(ug/1)
(ug/1)
(ug/1)
Loading
Loading
Data I
OBSERVED
(YES/NO)
---------
Cadmium
--
S
I---------
I 0.90
-----------------
2.361 J. 0.096
--------
0.413
--------
21.17
--------
Monitor
--------
Limit
---------I
Limit I
---------
NCAC
--------
YES
Chromium
S
I 7.46
59.032
3.821
53.496
48.28
Monitor
Limit
Limit I
NCAC
YES
Copper
AL
1 1.39
8.265
7.260
28.722
110.11
Monitor
Monitor
Monitor I
Weekly
YES
Nickel
S
I 4.63
103.897
1.251
49.321
30.32
Monitor
Limit
Limit I
NCAC
NO
Lead
S
I 4.71
29.516
0.807
27.495
34.73
Monitor
Limit
Limit I
NCAC
YES
Zinc
AL
I 7.78
59.032
38.410
86.910
115.19
Monitor
Monitor
Monitor I
Weekly
YES
Cyanide
S
I 0.44
5.903
0.177
2.031
16.94
Monitor
Limit
Limit I
NCAC
YES
Mercury
S
I 0.00
0.014- 2.031
4.062
0.00
Limit
Limit
I
Silver
AL
I 0.04
0.071
1.460
2.887
0.00
Monitor
Monitor
I
Selenium
S
I 0.18
5.903
0.000
0.000
0.00
I
Arsenic
S
I 1.79
59.032
0.000
0.000
0.00
I
Phenols
S
I
0.000
0.000
0.000
0.00
I
NH3-N
C
I
0.000
0.00
I
T.R.Chlor.AL
I
I
20.071
6267.76
Sendltt1r1
1
NCAC
YES
I
I
�
I
I
k N e u� c�cl cl- I 1,�' ►�i-kS - v Cc'v►�,u vvw, (,(�
C_ h.Verv►�,i.0 vw� �.L � t,K.(�, �► �c-c�.c� �v t,C-p ��`° C� e f,,ti � rw+ -�

.. • •► • • a• •,•� .
FACILITY NAME:h 6*k1PDES NO. NCAO
'REQUESTER: DATE: / / 90 RMION:
PERMIT CONDITIONS COVERING PRETRFATM N'T
This facility has no SIUs and should not have pretreatment language.
This facility should and/or is developing a pretreatment program.
Please include the following conditions:
Program Develop east
Phase I due
Phase II due
Additional Conditions
(attached)
This facility is currently implementing a pretreatment program.
Please include the following conditions:
Program Implementation
Additional Conditions
(attached)
SIGNIFICANT
INDUSTRIAL USERS'.
(SIUs) CONTRIBUTIONS
SIU FMI
-TOTAL:
- . CbMI'C ITIC7i l :
TTILE :
ix;ll
MEML FINISHING:
I3
07HM:
MM �
MGD
MM ;
HEM90RKS REVIEW
PARAME=
-� 55 TNaoub 'Y I-1-M IN LBS/DAY
i
ALMMLE
DCMESTIC PEFdifi,,ACTUAL
%b
Cr
C'Ni
zL
Pb
Zn
CN
0<10
Phenol
Other
---
_—
L:), 003
j RECEIVED:
/ / REVIEWED BY: 1 ✓ i ze- ! /M1
REJ FNED :

Amhhme*4 -7
GRANTS CREEK
TOWN CREEK
CRANE CREEK
CHURCH CREEK
SECOND CREEK
SC-3 SC-1
REEDY CREE
PAN I HER CREEK
DAM FS-2
POTTS CREEK
SWEARING CREEK
ABBOTTS CREEK
s
FS-3
FLAT SWAMP CREEK
�Q� ■ FLOW STATIONS
SAMPLING STATIONS
y
FIGURE 1. High Rock Lake Flow and Sampling Stations

Ax hmer-4 f
CENTRAL PIEDMONT
6
5
4
INCHES 3
2
AP,RIL MAY JUNE JULY -AUGUST OCTOBER _
MONTH
f s 4 '`1:989
• _ ®-1951-1980
.
`x �� iFIGURE 2 Total Monthly ,Precipitation in 1.989 and Total Monthly
Rrecipitati on for Period of Record (1951 - 1980)
$
as •r #"5`r. ,wi v e Y
(From: , Cl•imatological -Data: National Oceanic: -and ..
�SAtmospheric Administration..North Carolina. 1989.)Jl­
140
120
.100
CFS
60 r. '
60
40
r'�1—MEAN
f' 1989
JAN FEB 'MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
MONTH
�$ FIGURE 3: -.Mean Period of Record Flow (1979-1988) Compared to
1989 Flow for North Potts Creek

.h,xo� 9
G S
4.5
4
3.5
YG/L 3
2.5
2
1.5
0.5
0 t
r STATION
UPSTREAM 0 DOWNSTREAM
6
5.5
5
4.5
4
3.5
YG/L 3
2.5
2
1.5
0.5
j 0
5.5
5
4.5
4
3.5
YG/L 3
2.5
2
1.5
0.5
0
> o
STATION
JUNE
6
5.5
5
4.5
4
3.5
3
2.5
2
15
1
0.5
0
'c
a c
c
r c
6
5
4.5
4
3.5
3
2.5
2
5
0.5
0
0 0 > m
D
STATION
FIGURE S. Monthly Nitrogen and Phosphorus Values in High Rock Lake, 1989
AUGUST
OCTOBER
� TOTAL N
♦- TOTAL P

Af6 i mcnf 1 D
10
9
8
7
6
5
ug/I 4
3
1
0 0
0
0
2
0 ....... ------------ ....... ....... .. . ............
FS-1 FS-2 P-1 SC-1 SC-2 SW-1 T-1 3-2 1391A 169A 152U 169b
Stations
FIGURE 6. Box Plots of Chlorophyll -a in High Rock Lake, 1989
Chlorophyll -a
Standard

A&chme4 !I
e 1.
mean 1•laxiuiuiu �..a.,.«�.y ----r .--- -
f Selenastrum capricornutum (mg/L)
from High Rock Lake Water Samples (mg/L
June 28, 1989
Station Treatment Rep 1 Rep 2 Rep 3 Mean Rancie
YAD-169 B
Control
4.41
3.63
4.10
5.59*
4.05
11.19
0.78
1.46
C+N
10.46
4.52
11.92
4.58
4.88
4.66
0.36
C+P
4.09
4.31
4.98
16.22
4.46
.18.83
0.89
4.38
YAD-152'C
Control
-C+N
20.60
5.65
19.66
5.56
6.03
5.75
0.47
C+P
25.10
24.71
23.89
39.80
24.57
42.63
1.21
6.60
YAD-1391 A
Control
C+N
46.40
23.68
41.70
28.58
31.52
27.93
7.84
C+P
11.51
12.98
11.89
12.50*
12.13
17.35
1.47
2.70
SW-1
Control
C+N-
16.00
12.44
18.70
12.56
12.81
12.60
0.37
C+P
4
0 26
--_ - p_1 -
Control
3.47
3.45
15.15
3.71
16.14
3.5
15:27
-
1.62
C+N'
14.52
3.89
3.60
3.60
3.70
0.29
C+P
FS-1
0.25
0.31
0.24
0.20
0.27
0.19
0.07
0.04
Control
C+N
0.21
3.44
0.17
3.21
4.72
3.79
1.51
C+P
SC-1
3.23
1.84**
2.95
1.88**
3.09
6.32
0.28
1.53
Control
C+N
7.08
4.03
5.55
3.73
3.38
3.73
0.65
C+P
FS-2
5.71
6.08
6.05
13.03
5.95
12.80
0.38
6.72
Control
" C+N
13.55
7.42
11.83
5.71.
6.78
6.63
1.71
C+P
12.78
12.70
12.21
12.56
0.56
Control
SC-2
C+N
18.09
17.55
17.48
17.71
0.61
C+P
13.67
13.35
13.36
13.46
0.33
T-2
4.24
3.42
3.93
14.48
3.86
12.61
0.82
2.88
Control
C+N
11.60
11.75
5.07
5.08
5.-23
0.48
C+P
5.55
T-1
6.16
6.86
6.09
39.48
6.37
38.30
0.77
1.77
Control
C+N
37.71
8.51
37.72
7.56
7.80
7.96
0.96
C+P
*C+N
= control + nitrogen
C+P
= control + phosphorus
**
= outlier

A�chrnerrf /l (Conk.)
Table 2.
Chemical
Analysis
of High
Rock Lake,
North Carolina
Water Samples (mg/L)
June
29, 1989
Organic
Total
Total
Station
NH3N
NOZN03-N
TSIN-N
TKN
Nitrogen
Nitrogen
Phosphorus-P
SC-2
0.05
0.19
0.24
0.41
0.36
0.60
0.04
SC-1
<0.05
'-"<O.05
<0.10
0.40
0.35
0.45
0.04
FS-1
0.05
-,0:06,
0.11
0.41
0.36
0.47
0.06
FS-2
<0.05
.<0.05,
<0..10
0.43
0.38
0.49
0.03
YAD 169
<0.05
<0�05 '"
<0.10
0.52
0.47
0.58
0.04
YAD 13.91
0.05
0.65
0.70
0.39
0.34
'1:0.4
0.10
YAD 152C
<0.05
<0.05.
<0.10
0.40
0.35
0.45
0.05
T-1
<0.05
<0.05
<0.10
0.49
0.44
"0.54
0.04
SW-1=`
<0.05
-0.15
0.20
0.53
0.48
0.68
0.06
P-1
<0.05
<0.05
<0.10
0..49
0.44
0.54
0.06

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