NC0043532_Wasteload Allocation_19941005

NPDES DOCIMENT SCANNING COVER SHEET
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:
October 5, 1994
This document is printed on reuse paper - igizore arty
content on the resrerse side

Mom : u3iS tk„The4 1.JS
NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0043532
PERMITTEE NAME:
FACILITY NAME:
Town of Oakboro
Oakboro Wastewater Treatment Plant
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 001
Design Capacity: 0.50 MGD
Domestic (% of Flow): 30 %
Industrial (% of Flow): 70 %
Comments:
Town is still using Long Creek Outfall. They may be using Rocky
River Outfall, too. They want the permit to all the use of both outfalls
simultaneously "for a period of time". Therefore. permit must still
include both limits pages.
RECEIVING STREAM: Long Creek
Class: C
Sub -Basin: 03-07-13
Reference USGS Quad: G 17NE (please attach)
County: Stanly
Regional Office: Mooresville Regional Office
Previous Exp. Date: 11/30/94 Treatment Plant Class: Class II
Classification changes within three miles:
no change within three miles
Requested by: Dana Bolden
Prepared by: zr7.0.-t/Z Date: /
Reviewed by: Date: )
.--.DD,A_ i 50 g*vJ
t`YTT Aso
Date: 8/4/94
Modeler
Date Rec.
MM.tAl
8// z/9,/
79(o0
2
Drainage Area (mi ) / 92, 5 Avg. Streamflow (cfs): /4'3
7Q10 (cfs) . , 2, Winter 7Q10 (cfs) 5 ,30Q2 (cfs) g, 7
Toxicity Limits: IWC /6.. % Acute/C-'
Instream Monitoring: 1 %/ � /� -// /
Parameters P6. !-FRS eD /i h vvn , �.P-f-n y) . % vdt/d v1
Upstream y Location P /eidl h90 7-/-v keam
Downstream V Location dowrzllYea r % NOM /?I
Effluent
Characteristics
Summer
Winter
BOD5 (mg/1)
a,0
0
NH3-N (mg/1)
Tio,'1, ,
MC;1r tV('
D.O. (mg/1)
6
TSS (mg/1)
30
-_
F. Col. (/100 ml)
zvU
pH (SU)
HrSenic (v //)
a4,3.0
Nickel (u 1l)
463.0
Lead uu� II)
/3 /.0 —
egan# /' ( vq/J)
ab.0
ercv✓ (u /P)
0, 063
r i(. (f9'/e rile
moo; /D v
t/V
/11(. rl ,1.--c;--
omments:E{f'luent rnanittvihc Po le ('_hro» tu'yiJ( r1'9
C,0 (t71n lL4) 1 zl11C f pnh-d" )i Si e r (/71 /i /b
►hc101...e. a i f- i_TI'nN W; II tho}4I""

Town of Oakboro - NC0043532
Discharge Point (001)
Existing: Latitude: 35°14'08"
Longitude: 80°16'00"
Proposed Latitude: 35°12'41"
Longitude: 80°15'16"
;
6
59 •
•
•
•
•
L..
uar

--1 BAR
INFLUENT SCREEN
0.5 MGD
GRIT
REMOVAL
INFLUENT
PUMP
STATION
INDICATES LINES
NOT IN USE
AERATED SLUDGE
HOLDING BASIN
AERATION
BASIN
SECONDARY
CLARIFIER
SECONDARY
CLARIFIER
SLUDGE RETURN
DRAINAGE FROM DRYING BEDS
CHLORINE
CONTACT
BASIN
SLUDGE
HOLDING
TANKS
low
DISCHARGE 001
0.5 MGD
SLUDGE
DRYING BEDS
.STAND: -BY
USE ONLY
1
LTJ
I
1
FIGURE A
SCHEMATIC OF WASTEWATER FLOW
J

T•
SLUDGE MANAGEMENT PLAN
The Town of Oakboro currently operates a sludge land application program as permitted
by the North Carolina Division of Environmental Management under permit no.
WQ0005387. This permit will be effective through November 30, 1996. The Town of
Oakboro currently removes liquid waste sludge from a 250,000 gallon aeration basin and
applies the sludge to a 34 acre site that is specified in the permit. The basin stabilizes the
sludge through aerobic digestion, such that the sludge can be used under North Carolina
guidelines for land application. The estimated volume of sludge to be land applied is 9.76
dry tons per year. The site approved for land application contains 34 aces, excluding
buffer areas. The permit has been in place since December 13, 1991.
If the Town of Oakboro proceeds with a treatment plant expansion, they will also evaluate
the need for additional land application areas. There is some existing land at the permitted
site which is not being used for land application which could be used for an expansion of
the land application program. If additional sites are required, or if other sludge
management practices will need to be considered, these alternatives can be evaluated
during the design process. Since the design for the plant expansion will be based on
speculative limits, and since the plant design will also affect the amount of sludge
produced at the plant, no reliable estimates of sludge production from the new plant can
be made at this time.

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Town of OAkboro WWTP
NC0043532
70% Industrial and 30% Domestic
Existing
Renewal
Long Creek
C
030713
Stanly
Mooresville
Dana Bolden
8/4/94
G 17 NE
erc
�gg� N.C. DEPT. OF
7�E�PVIRONMENT, HEALTH.
& NATURAL RESOURCES
SEP 19 199,1
DIVISION OF ENVIRONMENTAL :ANA i
MOORESVILLE REGIONAL OFFICE
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
0212512207
Request # 8291
5/31/89
192.5
3.3
5.8
183
8.7
19
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Town is presently using Long Creek Outfall. They may be using Rocky River outfall in
the future and would like to receive limits for both locations. Speculative effluent limits were
requested for an expansion to 0.90 mgd; however, facility has no immediate plans to expand.
Facility is presently discharging approx. 72% of their design capacity. DMR review showed
facility to be operating sufficiently. Instream DO values are mostly above the standard with a few
substandard values in the summer of '93.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: 7.6/J11‘a Date: OA'
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineering:
Request #
Date: a /L1 / 5q
Date: ,$ 11
92in4 Date: / °/`{/°I /
RETURN TO TECHNICAL SUPPORT BY: 0 C 1 1 4 1994
lereieri

2
Existing Limits:
CONVENTIONAL PARAMETERS
Monthly Average
Summer Winter
Wasteflow (MGD): 0.50 0.50
BOD5 (mg/1): 30 30
NH3N (mg/1): monitor monitor
DO (mg/1): 6 6
TSS (mg/1): 30 30
Fecal Col. (/100 ml): 200 200
pH (SU): 6-9 6-9
Residual Chlorine (µg/1): monitor monitor
Oil and Grease (mg/1): N/A
TP (mg/1): monitor monitor
TN (mg/1): :monitor :monitor
Recommended Limits:
Monthly Average
Summer Winter
Wasteflow (MGD): 0.50 0.50
BOD5 (mg/1): 30 30
NH3N (mg/1): monitor monitor
DO (mg/1): 6 6
TSS (mg/1): 30 30
Fecal Col. (/100 m1): 200 200
pH (SU): 6-9 6-9
Residual Chlorine (µg/1): monitor monitor
Oil and Grease (mg/1): N/A
TP (mg/1): monitor monitor
TN (mg/1): :monitor :monitor
LIMIT TO CHANGES TO DUE:
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
(See page 4 for miscellaneous and special conditions, if applicable)

3
Type of Toxicity Test:
Existing Limit:
Recommended Limit:
Monitoring Schedule:
Existing Limits
Arsenic (ug/):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/l):
Lead (ug/1):
Zinc (ugll):
Cyanide (ug/1):
Mercury (ug/1):
Silver (ug/1):
Recommended Limits
Arsenic (ug/):
Chromium (ug/1):
Copper (ug/l):
Nickel (ug/1):
Lead (ug/l):
Zinc (ug/1):
Cyanide (ug/l):
Mercury (ug/1):
Silver (ug/1):
omttor
monitor
463
131
monitor
26
0.063
monitor
TOXICS/METALS
Chronic Toxicity (Ceriodaphnia) P/F
P/F at 19%
P/F at 19%
JAN, APR, JULY, OCT
Daily Max.
monitor
monitor
monitor
463
monitor
monitor
26
0.063
monitor
Daily Max. WQ or EL
V�Q
Qrtly
Mnthly
WQ
Mnthly
WQ
WQ
Mnthly
Long-term monitoring plan (LIMP) will be dropped as of 6/95.
Limit changes due to toxicant analysis: Maximum predicted was higher than
allowable= Limit.
1
th?Parameter(s) are water quality limited. For some parameters, the available load capacity of
e immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
No parameters are water quality limited, but this discharge may affect future allocations.

4
INSTREAM MONITORING REQUIREMENTS
Upstream Location: at least 100 feet upstream from discharge point
Downstream Location: Downstream at NCSR 1917.
Parameters: D.O., Fecal Coliform, Temp, conductivity.
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) N (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? N (Y or N) If yes, explain with attachments.

Facility Name (owl n of Oa kbwo w W p Permit # NCOO 435 32, Pipe # b01
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is / % (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
quarterry monitoring using this procedure to establish compliance with the permit condition. The first test will be
performed after thirty days from the effective date of this permit during the months of
JAN, $ P R , 3 U L 1 OCT . 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
4401 Reedy Creek Road
Raleigh, N.C. 27607
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 2 '7 cfs
Permitted Flow 4.5 MGD
IWC !'
Basin & Sub -basin Dad 7/3
Receiving Stream . Lon Cret k
County S-a n
Recommended by:
Date 9//�94
QCL PIF Version 9/91

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• OA�t &am '�3 i '94 Dim 414,4�s I9XICANT ANALYSIS
Lead
Parameter-
Chromium
25
µg/I
Standard =
50i
jig/I
BDL=1/2DL
Actual Data
RESULTS
n
BDL=1/2DL
Actual Data
RESULTS
6
6
Std Dev.
33.22073949
1
5
<10
Std Dev.
2.5
<5
Mean
38.72368421
2
5
<10
Mean
15
15
C.V.
0.857892015
3
5
<10
C.V.
2.5
<5
4
5
<10
2.5
<5
5
5
<10
16
16
Mult Factor =
2.3
6
5
<10
Mult Factor =
2.5
<5
Max. Value
164
µg/I
7
5
<10
Max. Value
2.5
<5
Max. Pred Cw
377.2
µg/I
8
5
<10
Max. Pred Cw
24
24
Allowable Cw
131.5
µg/I
9
5
<10
Allowable Cw
10
10
10
5
<10
2.5
<5
11
7
<14
2.5
<5
12
15
15
52
52
13
7
<14
62
62
14
7
<14
49
49
15
7
<14
43
43
16
7
<14
62
62
17
7
<14
55
55
18
7
<14
43
43
19
7
<14
60
60
20
7
<14
39
39
21
7
<14
53
53
22
7
<14
50
50
23
7
<14
88
88
24
7
<14
164
164
25
7
<14
92
92
26
7
<14
53
53
27
15
15
.' 36
36
28
18
18
6
6
29
7
<14
7
7
30
7
<14
33
33
31
7
<14
8
8
32
52
52
33
62
62
34
56
56
X
35
62
` / 62
36
53
/ 53
37
43
' 43
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
8/30/94
PAGE

TOXICANT ANALYSIS
arameter =
Nickel
Parameter =
Cyanide
::::Standard =
88
/I
Standard =
3.095
7.226
n
BDL=1/2DL
Actual Data RESULTS
n
BDL=1/2DL
1
5
<10 Std Dev.
37.41
2
5
<10 Mean
34.39
0.428
3
5
<10 C.V.
1
5
2
2.5
1.088 3
4
16
16
1.66
_..-18 µg/I
29.88 µg/I
262.9 µg/I
5
5
<10
6
7
8
9
10
11
12
5
5
5
11
37
5
5
<10 Mult Factor =
<10 Max. Value
<10 Max. Pred Cw
11 Allowable Cw
37
<10
<10
2.38
222 µg/I
528.4 µg/I
462.7 µg/I
13
29
29
14
57
57
15
32
32
2.5
4
7
5
6
7
2.5
2.5
2.5
8
2.5
9
2.5
10
2.5
11
2.5
12
2.5
13
0.5
14
0.5
15
0.5
16
17
18
222
32
30
222
32
30
19
20
21
22
23
14
16
15
25
29
14
16
15
25
29
24
36
36
25
14
14
26
20
20
27
22
22
28
19
19
29
14
14
30
15
15
31
14
14
32
19
19
33
60
60
34
55
55
35
46
46
36
73
73
37
42
42
38
98
98
39
68
68
40
106
106
41
78
78
42
43
44
66
75
29
66
75
29
45
57
57
46
47
48
63
14
16
63
14
16
49
15
15
50
5
<10
51
<10
52
16
17
18
0.5
0.5
0.5
19
20
21
38
8
6
22
5
23
7
24
1
25
26
27
8
28
5
29
30
3
31
3
32
33
2
34
35
8
36
2
37
2
38
2
39
2
40
0.5
41
0.5
42
0.5
43
8
44
45
46
47
48
49
50
51
52
8/30/94 PAGE

TOXICANT ANALYSIS
un1
'',Parameter =
Copper
Standard =
7 µg/I
Actual Data RESULTS n
BDL=1/2DL
RESULTS
5 Std Dev. 5.7123 1
<5 Mean 4.0111
<5 C.V.
Actual Data
Std Dev.
121.822
2
1.4241 3
7 4
21
81
58
21
81
58
Mean
C.V.
142.326
0.85594
<5 5
<5 Mult Factor =
<5 Max. Value
2.92
38 µg/I
6
7
<5 Max. Pred Cw 110.96 µg/1`'>` 8
<5 Allowable Cw 26.3 µg/I
<5
<5
<5
<1
<1
<1
<1
<1
<1
38
9
10
11
12
13
14
15
16
17
18
19
8 20
6 21
5 22
28
145
120
68
96
74
77
358
398
368
112
34
32
46
153
47
95
46
28
145
120
68
96
74
77
358
398
368
112
34
32
46
153
47
95
46
Mutt Factor = ! 2.3
Max. Value
Max. Pred Cv►
Allowable Cw
398
915.4
36.8
µg/I
µ9/I
µ9/I
7 23
66
66
1 24
3
2
8
5
3
3
3
3
2
4
8
2
2
68
68
25
26
27
28
29
30
31
32
33
34
35
36
37
96
98
358.4
397.6
386.4
76
126
309
228
104
118
93
96
98
358.4
397.6
386.4
76
126
309
228
104
118
93
2 38
2 39
<1 40
<1 41
<1 42
8 :..,.,.,. 43
8 '<`<> 44
45
46
47
48
49
50
51
52
8/30/94 PAGE

TOXICANT ANALYSIS
Parameter Zinc
Standard = 50
n BDL=1/2DL
Actual Data
RESULTS
1 35
35
Std Dev. 68.9749
2 232
232
Mean
74.4483
3 46
46
C.V.
0.92648
4 37
5 58
37
58
6 35
35
Mutt Factor = 2.75
7 59
8 54
9 63
10 46
11 38
12 50
13 49
14 57
15 38
16 59
17 46
18 36
19 81
20 352
21 36
22 196
23 64
24 73
25 74
26 67
27 73
28 52
29 53
59
54
63
46
38
50
49
57
38
59
46
36
81
352
36
196
64
73
74
67
73
52
53
Max. Value 352 µg/I
Max. Pred Cw 968 µg/I
Allowable Cw 262.9 µg/I
'Parameter =
Silver
:Standard =
0.06 WI
n
1
2
3
4
5
6
7
BDL=1/2DL Actual Data
2.5 <5
2.5 <5
2.5 <5
3 <6
2.5 <5
35 35
4 4
8
9
10
11
12
13
14
15
16
17
18
19
20
14 14
8 8
6 6
4 4
3 3
5 5
3 3
2.8 2.8
3 3
4 4
2 2
5 5
4 4
21
22
4 4
4 4
23
5.6 5.6
24
5.6 5.6
25
4.2 4.2
26
27
28
29
2.8 2.8
2.5 <5
2.5 <5
2.5 <5
30
30
2.5 <5
31
32
33
34
31
32
33
34
2.5 <5
2.5 <5
2.5 <5
35
36
37
35
36
37
38
39
38
39
40
40
41
42
43
44
45
46
47
48
49
41
42
43
44
45
46
47
48
49
50
50
51
51
52
52
8/30/94
PAGE 4

TOXICANT ANALYSIS
ie.r
€:: Parameter =
Standard =
RESULTS
Mercury
0.012 µg/1
;Parameter =
Standard =
n
BDL=1/2DL
Actual Data RESULTS
Std Dev.
Mean
C.V.
5.86535
4.83333
1.21352
1
2
3
0.1
0.1
0.1
<0.2 Std Dev.
<0.2 Mean
<0.2 C.V.
0.083
0.144
0.579
4
0.3
0.3
1
2
3
4
5
0.1
<0.2
5
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
3.14
35 µg/1'
109.9 µg/I
0.3 milir
'
6
0.1
<0.2 Mult Factor =
7
8
0.125
0.125
<0.25 Max. Value
<0.25 Max. Pred Cw
2.04
0.4 pg/I
0.816 µg/I
6
7
8
9
10
0.125
0.125
<0.25 Allowable Cw 0.063 µg/I '':?< 9
<0.25 10
11
0.125
<0.25
11
12
0.125
<0.25
13
0.3
0.3
14
0.1
<0.2
15
0.4
0.4
12
13
14
15
16
0.1
<.2
17
0.1
<.2
16
17
18
0.1
<.2
18
19
0.1
<.2
20
0.1
<.2
19
20
21
0.1
<.2
22
0.1
<.2
21
22
23
0.3
0.3
24
0.125
<0.25
23
24
25
0.125
<0.25
26
27
25
26
27
28
29
28
29
30
31
30
31
32
33
34
35
36
37
32
33
34
35
36
37
38
39
38
39
40
40
41
41
42
42
43
43
44
45
46
47
44
45
46
47
48
48
49
50
51
52
49
50
51
52
8/30/94 PAGE',

TOXICANT ANALYSIS
Arsenic
50
BDL=1/2DL
Actual Data
RESULTS
96
96
Std Dev. 22.2837
35
35
Mean 27.7222
24
24
C.V. 0.80382
32
32
22
22
2
2
Mult Factor = s 3
26
30
43
5
26
30
43
5
Max. Value 96 µg
Max. Pred Cw 288 µg/I
Allowable Cw 262.9 µg/1
5
5
39
39
4
4
51
51
24
24
32
32
22
22
7
7
51 x3 : 155
8/30/94 PAGE E

TOXICANT ANALYSIS
IV
/Y
P`e� [TM)
T
'L,TmP
_nnlrl� .rv�
4)
Facility Name
Town of Oakboro WWTP
NPDES #
NC0043532
Qw (MGD)
0.5
7Q10s (cfs)
_.._.._.._.._.._.
3.3
19.02
/WC( )
Rec'ving Stream
Long Creek
Stream Class
C
FINAL RESULTS
Lead
Max. Pred Cw
I,-
377.2
Allowable Cw
131.5
Chromium
Max. Pred Cw
LT►'Y) P
29.88
Allowable Cw
262.9
Nickel
Max. Pred Cw
L
528.36
Allowable Cw
462.7
Cyanide
j
Max. Pred Cw
110.96
Allowable Cw
26.3
Copper
rri,:,,1-11,,
Max. Pred Cw
915.4
Allowable Cw
36.8
Zinc
, ,
Max. Pred Cw
968
Allowable Cw
262.9
Silver
-, ,
Max. Pred Cw
109.9
Allowable Cw
0.3
Mercury
1., \\,,,.4
Max. Pred Cw
0.816
Allowable Cw
6, 66,-
0.1
Arsenic
... -
Max. Pred Cw
288
Allowable Cw
262.9
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
Test vol = /PI . x / les/
��vu.6' = 92 a 47a/ a 211•
�irrrt ,r N PO rS etr in, 1
t9si vat
IA,. 222 rcv)(1 pest.
2
l U 106,, 106�hax= 25
�orrr �y it/ IDES
IPS I- VO-ULL 30 )<t
L
pir Aoki LP I- eb.
I IA
r sit,d,hrrs`i'G1•.•
YYI rfrte 1/1,111-. Victtt-C
1
1
less (t,,,,
de �e�trtrr vaiasi
8/30/94
PAGE'

Page 1
Note for Michelle Wilson
From: Carla Sanderson
Date: Tue, Sep 13, 1994 8:14 AM
Subject: FW: Toxicity
To: Michelle Wilson
Michelle - see notes below concerning the Oakboro WLA. We will need to give the same tox
test to both facilities since we are giving the same metals limits. Please make note of these
two facilities in your Yadkin Basin files and be sure to note on the Carolina Solite WLA that
the toxicity test whoudl be changed.
From: Ruth Swanek on Tue, Sep 13, 1994 8:10 AM
Subject: RE: Toxicity
To: Carla Sanderson
Giving the same tox limit to both makes sense to me. I talked to Phil Bethea at lab, and he
agreed. He said he would also tell Matt, and if Matt saw a problem he would call us. So, I
guess we should change the WET limits too. (I will do that for Cogentrix and Rocky Mount
if I ever get the WLA).
From: Carla Sanderson on Tue, Sep 13, 1994 7:58 AM
Subject: Toxicity
To: Ruth Swanek
I am reviewing a WLA for Oakboro relocation into the Rocky River right next to Carolina
Solite. Michelle considered interation for metals but did not for Toxicity Test. Shoudn't we
give total wasteflow IWC and subsequently the same tox test for both facilities? One issue
here is that Carolina Solite does not discharge much at all anymore. The permit is only for
emergencies which have not happened in the last 2-3 years.
Expansion r J fie►- cAart p/ INC = 9 7
/ 7 7

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
g wL19 . L-x pays/)Y)
re tv4ur c
FACT SHEET FOR WASTELOAD ALLOCATION
Town of OAkboro WWTP
NC0043532
70% Industrial and 30% Domestic
Existing
Renewal- -1 r)i
Receiving Stream: -Long Creek
Stream Classification: O._
Subbasin: 030713
County: Stanly
Regional Office: Mooresville
Requestor:
Date of Request:
Topo Quad:
Dana Bolden
8/4/94
G 17 NE
Request # 7968
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
cf4
0212512207
Request # 8291
5/31/89
192.5
3.3
5.8
183
8.7
19% at 0.50 MGD
30% at 0.90 MGD
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Town is presently using Long Creek Outfall. They may be using Rocky River outfall in
the future and would like to receive limits for both locations. Speculative effluent limits were
requested for an expansion to 0.90 mgd. Facility is presently discharging approx. 72% of their
design capacity; therefore, I included limits for the expansion. DMR review showed facility to be
operating sufficiently. Instream DO values are mostly above the standard with a few substandard
values in the summer of '93.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by:
Reviewed by
Instream Assessment: Date:
Regional Supervisor: Date:
Permits & Engineering: Date:
,inZZ
RETURN TO TECHNICAL SUPPORT BY:

Existing Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 ml):
pH (SU):
Residual Chlorine (14/1):
Oil and Grease (mg/1):
TP (mg/1):
TN (mg/1):
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 ml):
pH (SU):
Residual Chlorine (µg/1):
Oil and Grease (mg/1):
TP (mg/1):
TN (mg/1):
CONVENTIONAL PARAMETERS
Monthly Average
Summer Winter
0.50 0.50
30 30
monitor monitor
6 6
30 30
200 200
6-9 6-9
monitor monitor
N/A
monitor monitor
:monitor :monitor
Monthly Average
Summer Winter
0.50 0.50
30 30
monitor monitor
6 6
30 30
200 200
6-9 6-9
monitor monitor
N/A
monitor monitor
:monitor :monitor
LIMIT TO CHANGES TO DUE:
Monthly Average
Summer Winter
0.90 -- 0.90 —Mo appl ca-hm, iipaii5lon
9 18 br i d• I-�-Pac,1, dopyno4
3 6 re�,ue5t 4h�S, +hem +hP44 1; rw
6 6 ' 11 o� �pp� a+ ;s ver ew
30 30
200 200
6-9 6-9
28 28
monitor monitor
monitor monitor
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
(See page 4 for miscellaneous and special conditions, if applicable)

3
Type of Toxicity Test:
Existing Limit:
Recommended Limit:
Monitoring Schedule:
Existing Limits
Arsenic (ug/):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/1):
Lead (ug/1):
Zinc (ug/l):
Cyanide (ug/1):
Mercury (ug/1):
Silver (ug/l):
,Recommended Limits
Arsenic (ug/):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/1):
Lead (ug/1):
Zinc (ug/1):
Cyanide (ug/1):
Mercury (ug/1):
Silver (ug/l):
TOXICS/METALS
Chronic Toxicity (Ceriodaphnia) P/F
P/F at 19%
P/F at 19% for 0.5 mgd
P/F at 30% for 0.9 mgd
JAN, APR, JULY, OCT
Daily Max.
monitor
monitor
monitor
463
monitor
monitor
26
0.063
monitor
0.5 MGD
Daily Max.
monitor Mnthly
monitor Qrtly
monitor
463
131
monitor
26
0.063
monitor
WQ or EL
Mnthly
WQ
WQ
Mnthly
WQ
WQ
Mnthly
168
monitor
monitor
296
84
monitor
17
0.040
monitor
0.9 MGD
Daily Max
WQ
Qrtly
WQ
WQ
WQ
WQ
Long-term monitoring plan (LTMP) will be dropped as of 6/95.
Limit changes due to toxicant analysis: Maximum predicted was higher than
allowable= Limit.
Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
No parameters are water quality limited, but this discharge may affect future allocations.

•. 4
INSTREAM MONITORING REQUIREMENTS
Upstream Location: at least 100 feet upstream from discharge point
Downstream Location: Downstream at NCSR 1917.
Parameters: D.O., Fecal Coliform, Temp, conductivity.
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) N (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? N (Y or N) If yes, explain with attachments.

Facility Name //cvp 0 / 6/h,fd tan) Permit # /VCO/ 3S-3! Pipe # A /
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is 30 % (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 the effective date of this permit during the months of
. 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
4401 Reedy Creek Road
Raleigh, N.C. 27607
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 I cfs
Permitted Flow MGD Recommended by:
IWC ap
Basin & Sub -basin Ylcl 63�17 � Z
Receiving Stream e_e � Ci-ee
County Sly F, Date 9
QCL PIF Version 9/91

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0043532
PERMITTEE NAME:
FACILITY NAME:
Town of Oakboro
Oakboro Wastewater Treatment Plant
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 002
Design Capacity: 0.50 MGD
Domestic (% of Flow): 30 %
Industrial (% of Flow): 70 %
Comments:
Town is still using Long Creek Outfall(001). They may be using
Rocky River Outfall(002), too. They want the permit to all the use of
both outfalls simultaneously "for a period of time". Therefore, permit
must still include both limits pages.
RECEIVING STREAM: Rocky River
Class: C
Sub -Basin: 03-07-13
Reference USGS Quad: G 17NE (please attach)
County: Stanly
Regional Office: Mooresville Regional Office
Previous Exp. Date: 11/30/94 Treatment Plant Class: Class II
Classification changes within three miles:
no change within three miles
Requested by: Dana Bolden Date: 8/4/94
.
Prepared by:��� (/1:) Date: •
Reviewed by: C�
D.17 u CS } W)
WQ .L- LU(3)
Modeler
Date Rec.
#
tit tit co
9/iz/9 t
'7
Drainage Area (m'2 ) "%,; c Avg. Streamflow (cfs):
7Q10 (cfs) 9 Winter7Q10 (cfs) 5/ 30Q2 (cfs) '7
Toxicity Limits: IWC : 2, (., % Acutehro>
Instream Monitoring:
Parameters Q D, /PC 1 eMP, 011971.d06 l r
Upstream v Location / OD' C-h o d
Downstream ✓ Location 1, 7 'IAA- ,6 "" ' - I
(() eild 01' 5R 16,5 or
,,p ,.t pt
Effluent
Characteristics
Summer
Winter
BOD5 (mg/I)
30
3o
NH3-N (mg/1)
/
rhOn; file
/
trod/ f�'r
D.O. (mg/1)
TSS (mg/1)
30
361
F. Col. (/100 ml),6
2
�--C, C
pH (SU)
6 _ r7
6- cj
Ile at la -die
;/-7 i AD r
-/71f1y714' r
-rP
MPt7 i I'D r
I4 ()n J h2v'
RV
111n n , IN
ffra,,1 t fi'y
/_ Pa f1 ( if),
=34a fi'. 0
Ca an i (% <u 11)
71. 0
Merc C -t. 67- ii,)
O / 1'
,t1 n 17/ ✓ -HA,‘
real;
if- . Zlr'4C ,
S% 1 ve r
i1/1Cn:1-nr filnik,u-('c:0,3
Comments: .f4c (J -9 ttl t litI nriG,-. PPi po
Li1r11� WJI h (100,0G.

•
.•
;
•;.„
4... '
•••••.
,
6 ' •
...-• _
tt.
-1‘c.
ta
';'•••••;"" \‘.. /—
r " •
•••-•;„„•-• /
,/ „„..; •••._
*•-•"•;.,. ••
. • .
14.
• 1= —
„,..-tr-tr4777
;40
••
4,
t•
0...;.;35s), •
•
•
a.0
' • 450
•
Town of Oakboro - NC0043532
Discharge Point (001)
Existing: Latitude: 35°14'08"
Longitude: 80°16'00"
Proposed Latitude: 35°12'41"
Longitude: 80°1516"
••c
...,..•;0/, f ."
•::.,••"-••
/...". 4 •;:61:
.fri..; ''''..7-- '.--' ..'- • ' a
%.,
I ! . '. // .-.... .• ,.-. • ,-./:i ' .-1-ts
-
ili - •. .. •
:„...-.,...- • ..:•-,
.. -,•-.....
, 7.:::,:. .•
%

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Town of Oakboro WWTP
NC0043532
70% Industrial and 30% Domestic
Existing
Renewal
Rocky River
C
030713
Stanly
Mooresville tip
Dana Bolden
8/4/94
G17NE
Request #
N.C. DEPT. OF
RONMENT, HEALTH,
NATURAL RESOURc!:S
SEP 19 199A
SION OF ENVIRONMENTAL MANAGEMEN1
MOORESVILLE REGIONAL OFFICE
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
0212513330
Request # 8291
5/31/89
965
29
51
920
76
2.6
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Town is presently using Long Creek Outfall. They may be using Rocky River outfall in
the future and would like to receive limits for both locations. Speculative effluent limits were
requested for an expansion to 0.90 mgd; however, facility has no immediate plans to expand.
Facility is presently discharging approx. 72% of their design capacity. DMR review showed
facility to be operating sufficiently. Instream DO values are mostly above the standard with a few
substandard values in the summer of '93. Recommended limits are based on interaction with
Carolina Solite.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: *,%1
Date: 9
Reviewed by (2h
Instream Assessment: . C7/yl Date: V/I- /5 /
Regional Supervisor: ()RLaG1�r� /%7Jf Date: %/2o/91
Permits & Engineering: 90"'G,G/.Fi Date: /07104
RETURN TO TECHNICAL SUPPORT BY:
OOi 14

Existing Limits:
2
CONVENTIONAL PARAMETERS
Monthly Average
Summer Winter
Wasteflow (MGD): 0.50 0.50
BOD5 (mg/1): 30 30
NH3N (mg/1): monitor monitor
DO (mg/1): 6 6
TSS (mg/1): 30 30
Fecal Col. (/100 m1): 200 200
pH (SU): 6-9 6-9
Residual Chlorine (µg/1): monitor monitor
Oil and Grease (mg/1): N/A
TP (mg/1): monitor monitor
TN (mg/1): :monitor :monitor
Recommended Limits:
Monthly Average
Summer Winter
Wasteflow (MGD): 0.50 0.50
BOD5 (mg/1): 30 30
NH3N (mg/1): monitor monitor
DO (mg/1): 6 6
TSS (mg/1): 30 30
Fecal Col. (/100 ml): 200 200
pH (SU): 6-9 6-9
Residual Chlorine (µg/1): monitor monitor
Oil and Grease (mg/1): N/A
TP (mg/1): monitor monitor
TN (mg/1): :monitor :monitor
J.,INMIT TO CHANGES TO DUE:
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
(See page 4 for miscellaneous and special conditions, if applicable)

3
Type of Toxicity Test:
Existing Limit:
Recommended Limit:
Monitoring Schedule:
Existing Limits
Arsenic (ug/):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/1):
Lead (ug/1):
Zinc (ug/1):
Cyanide (ug/1):
Mercury (ug/1):
Silver (ug/l):
Recommended Limits
Arsenic (ug/):
Chromium (ug/1):
Copper (ug/l):
Nickel (ug/1):
Lead (ug/l):
Zinc (ug/l):
Cyanide (ug/l):
Mercury (ug/1):
Silver (ug/l):
TOXICS/METALS
Chronic Toxicity (Ceriodaphnia) P/F
P/F at 3% i P/F at Flz0-r�.sT� ik406j I 0(a /
JAN, APR, JULY, OCT
Daily Max.
monitor
monitor
monitor
463
monitor
monitor
26
0.063
monitor
ko
Daily Max. WQ or EL
monitor Qrtly 0,6 1(; )
monitor Qrtly '
monitor mnthly
monitor Qrtly
368 WQ
monitor mnthly
74 WQ
0.177 WQ
monitor QiCyMon•i�,l�
Limit changes due to toxicant analysis: Maximum predicted was higher than
allowable= Limit. If action level and the previous statement appliess then monitor
in NPDES permit. Interaction with Carolina Solite considered: Lead and
Cynanide limits are equal for both facilities. They share the allowable
concentrations to protect against instream toxicity., �Up�7£S
LT'i1 P i 1 I �.Q cOto pitl 4 r �o,� �Ytt-vt,�. -fo v . "G Inc
XParameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
No parameters are water quality limited, but this discharge may affect future allocations.

4
INSTREAM MONITORING REQUIREMENTS
Upstream Location: at least 100 feet upstream from discharge point
Downstream Location: 1.7 miles downstream from effluent (at end of SR 1659 or nearest point)
Parameters: D.O., Fecal Coliform, Temp, conductivity.
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) N (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? N (Y or N) If yes, explain with attachments.

Facility Name Tn w n of- U a k W 1NT P Pezinit # )WOO 43532 Pipe # ()()l
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is% (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
a 1° quarterly monitoring using this procedure to establish compliance with the permit condition. The first test will be
performed after thirty days from the effective date of this permit during the months of
3AN, APR, LI Ocr . 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
4401 Reedy Creek Road
Raleigh, N.C. 27607
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 S cfs
Permitted Flow 0. 5 MGD -
IWC ; 11► %a L°fa
Basin & Sub -basin 03o7 /3
Receiving Stream Rock River
County Sian I J
QCL PIF Version 9/91
Recommended by:
Date 9/11/94

vif‘
TOXICANT ANALYSIS
Facility Name
Town of Oakboro WWTP
NPDES #
NC0043532
Ow (MGD)
1.364
7010s (cfs)
_.,_.._.._.._.._.._.._. 29
_.._.._.._..-6.79
/WC (%)
Reeving Stream
Rocky River
Stream Class
C
FINAL RESULTS
Lead
Max. Pred Cw
377.2
Allowable Cw
367.9
Chromium
Max. Pred Cw
29.88
Allowable Cw
735.8
Nickel
Max. Pred Cw
528.36
Allowable Cw
1295.1
Cyanide
Max. Pred Cw
110.96
Allowable Cw
73.6
Copper
Max. Pred Cw
915.4
Allowable Cw
103.0
Zinc
Max. Pred Cw
968
Allowable Cw
735.8
Silver
Max. Pred Cw
109.9
Allowable Cw
0.9
Mercury
Max. Pred Cw
0.816
Allowable Cw
0.177
Arsenic
Max. Pred Cw
288
Allowable Cw
735.8
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
7¢u /.(
mil:1- k/2/)t
offer
troy] < •{ , N)pe--
L 1k
Mtn i\(\t/
9/12/94
PAGE

TOXICANT ANALYSIS
Facility Name
Town of Oakboro WVVfP
NPDES #
NC0043532
Qw (MGD)
` 0.5
7010s (cfs)
29
IWC (%)
„_.._.._.._.._.._.._. _.._.._.._..-2.60
Reeving Stream
Rocky River
Stream Class
C
FINAL RESULTS
Lead
Max. Pred Cw
377.2
Allowable Cw
960.5
Chromium
Max. Pred Cw
29.88
Allowable Cw
1921.0
Nickel
Max. Pred Cw
528.36
Allowable Cw
3380.9
Cyanide
Max. Pred Cw
110.96
Allowable Cw
192.1
Copper
Max. Pred Cw
915.4
Allowable Cw
268.9
Zinc
Max. Pred Cw
968
Allowable Cw
1921.0
Silver
Max. Pred Cw
109.9
Allowable Cw
2.3
Mercury
Max. Pred Cw
0.816
Allowable Cw
0 , 4(D ! 0.5
Arsenic
Max. Pred Cw
288
Allowable Cw
1921.0
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
r
Icte,e.g 114, 464062
uvul-6-;-4\at.,
0.( 17A00)
�k v r � ��, v,
3b8 up o�) = 0.�c4
b
Wilt t 1'jiv
Php„�r f0 y
moo (lb
Novi I-0 r
Y1)OLI I J-0
8/30/94
PAGE '

Oakboro WWTP and Carolina Solite
Rocky River NC0043532 & NC0028169
Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ug/i)
Fecal Limit
Ratio of 13.7 :1
Ammonia as NH3
(summer)
29 7010 (CFS)
1.364 DESIGN FLOW (MGD)
2.1142 DESIGN FLOW (CFS)
17.0 STREAM STD (MG/L)
0 UPS BACKGROUND LEVEL (MG/L)
6.8 % IWC (%)
250 Allowable Concentration (mg/I)
Ammonia as NH3
(winter)
7010 (CFS)
200/100m1 DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
29
1.364
2.1142
1.0
0.22
6.8 %
12
0.22
0.009
0.01395
1.8
0.22
6.0 %
27

,oxS
059
060 ,o60 ;PD )ono
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.003 ti.53
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Kio tf, 197.3
f ,''F I �� I NC I OFF l N F I€�
1►bIZt
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Lewd. ,644.)
1 • (AS
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kree4 e4., , ao6Z/
to f-fit , oZ'J
daykpid
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BLI - ZA-ev.ti -Eov\L3ot4c

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Town of Oakboro WWTP
NC0043532
70% Industrial and 30% Domestic
Existing
Renewal & Expansion
Rocky River
030713
Stanly
Mooresville
Dana Bolden
8/4/94
G 17 NE
Request # 7969
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
0212513330
Request # 8291
5/31/89
965
29
51
920
76
2.6 @ 0.50 mgd
4.6 @ 0.90 mgd
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Town is presently using Long Creek Outfall. They may be using Rocky River outfall in
the future and would like to receive limits for both locations. Speculative effluent limits were
requested for an expansion to 0.90 mgd. Facility is presently discharging approx. 72% of their
design capacity. I spoke with Oakboro WWTP Operator and he informed me about their proposed
expansion to begin within this permit cycle; therefore, I included limits for their expansion. DMR
review showed facility to be operating sufficiently. Instream DO values are mostly above the
standard with a few substandard values in the summer of '93. Recommended limits are based on
interaction with Carolina Solite.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by:
Reviewed by
Instream Assessment: Date:
Regional Supervisor: Date:
Permits & Engineering: _ Date:
114
RETURN TO TECHNICAL SUPPORT BY:

Existing Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (4/1):
Oil and Grease (mg/1):
TP (mg/1):
TN (mg/1):
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (4/1):
Oil and Grease (mg/1):
TP (mg/1):
TN (mg/1):
3
CONVENTIONAL PARAMETERS
Monthly Average
Summer Winter
0.50 0.50
30 30
monitor monitor
6 6
30 30
200 200
6-9 6-9
monitor monitor
N/A
monitor monitor
:monitor :monitor
Monthly Average Monthly Average
Summer Winter No APPI; cu i-i b-rt for Q,yc�in Si
871
0.90 ' (.)b rvL,. {led. i r-leat1, does nef
18 reg4ve6t ,{fit; +hex 41J6e 1,44ds
6 do not aPPly a�-¢{,:sfin�•
6
30
200
6-9
28
Summer Winter
0.50 0.50 0.90 -7
30 30 9
monitor monitor 3
6 6 6
30 30 30
200 200 200
6-9 6-9 6-9
monitor monitor 28
N/A
monitor monitor monitor monitor
:monitor :monitor monitor monitor
LIMIT TO CHANGES TO DUE:
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
(See page 4 for miscellaneous and special conditions, if applicable)

4
Type of Toxicity Test:
Existing Limit:
Recommended Limit:
Monitoring Schedule:
Existing Limits
Arsenic (ug/):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/l):
Lead (ug/1):
Zinc (ug/l):
Cyanide (ug/1):
Mercury (ug/l):
Silver (ug/l):
Recommended Limits
FLOW (MGD):
Arsenic (ug/):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/l):
Lead (ug/1):
Zinc (ug/l):
Cyanide (ug/1):
Mercury (ug/1):
Silver (ug/1):
TOXICS/METALS
Chronic Toxicity (Ceriodaphnia) P/F
P/F at 3%
P/F at 3% at 0.50 MGD
P/F at 5% at 0.90 MGD
JAN, APR, JULY, OCT
Daily Max.
monitor
monitor
monitor
463
monitor
monitor
26
0.063
monitor
Daily Max. WQ or EL
0.50
monitor Qrtly
monitor Qrtly
monitor mnthly
monitor Qrtly
368 WQ
monitor mnthly
74 WQ
0.177 WQ
monitor mnthly
Daily Max.
0.90
monitor Qrtly
monitor Qrtly
monitor 2/month
monitor Qrtly
290 WQ
monitor 2/month
58 WQ
0.139 WQ
monitor 2/month
Limit changes due to toxicant analysis: Maximum predicted was higher than
allowable- Limit. If action level and the previous statement applies* then monitor
in NPDES permit. Interaction with Carolina Solite considered: Lead and
Cynanide limits are equal for both facilities. They share the allowable
concentrations to protect against instream toxicity.
Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
No parameters are water quality limited, but this discharge may affect future allocations.

5
INSTREAM MONITORING REQUIREMENTS
Upstream Location: at least 100 feet upstream from discharge point
Downstream Location: 1.7 miles downstream from effluent (at end of SR 1659 or nearest point)
Parameters: D.O., Fecal Coliform, Temp, conductivity.
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) 1V (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? _N (Y or N) If yes, explain with attachments.

Facility Name �'1 �' c / (/0 r u W hi I P Pei lziit # U (J0 4- 35321. Pipe # n Z.
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is 5 % (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 the effective date of this permit during the months of
TAN/ 0,1 J-vL``DCT . 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
4401 Reedy Creek Road
Raleigh, N.C. 27607
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 cfs
Permitted Flow 0 . % MGD Recommended
IWC 4, 6 %
Basin & Sub -basin MO 307/ 2 ` 2f--e'!
Receiving Stream , e ., / !fir Vie ✓
County S-I-vn
QCL P/F Version 9/91

ro r X , ki1SiZ� o - Loyt'] Crer'L
'TOXICANT ANALYSIS tJ
Facility Name
Town of Oakboro WWTP
NPDES #
NC0043532
Ow (MGD)
0.9
7010s (cfs)
3.3
IWC (%)
„_.._.._.._.._.._.._. _.._.._.•29.71
Rec'ving Stream
Long Creek J
Stream Class
C
FINAL RESULTS
Lead
Max. Pred Cw
377.2
Allowable Cw
84.1
Chromium
Max. Pred Cw
29.88
Allowable Cw
168.3
Nickel
Max. Pred Cw
528.36
Allowable Cw
296.2
Cyanide
Max. Pred Cw
110.96
Allowable Cw
16.8
Copper
Max. Pred Cw
915.4
Allowable Cw
23.6
Zinc
Max. Pred Cw
968
Allowable Cw
168.3
Silver
Max. Pred Cw
109.9
Allowable Cw
0.2
Mercury
Max. Pred Cw
0.816
Allowable Cw
0.040
Arsenic
Max. Pred Cw
288
Allowable Cw
168.3
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
9/12/94
PAGE

/iJ,Z;1_ + loc6Prh
TOXICANT ANALYSIS
Facility Name
Town of Oakboro WWTP
NPDES #
NC0043532
Qw (MGD)
1.764
7010s (cfs)
IWC (%)
„_.._.._.._.._.._.._.._.._.._.._.._..29.
8.62
Rec'ving Stream
Rocky River
Stream Class
C
FINAL RESULTS
Lead
Max. Pred Cw
377.2
Allowable Cw
290.2
Chromium
Max. Pred Cw
29.88
Allowable Cw
580.3
Nickel
Max. Pred Cw
528.36
Allowable Cw
1021.4
Cyanide
Max. Pred Cw
110.96
Allowable Cw
58.0
Copper
Max. Pred Cw
915.4
Allowable Cw
81.2
Zinc
Max. Pred Cw
968
Allowable Cw
580.3
Silver
Max. Pred Cw
109.9
Allowable Cw
0.7
Mercury
Max. Pred Cw
0.816
Allowable Cw
0.139
Arsenic
Max. Pred Cw
288
Allowable Cw
580.3
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
0
Max. Pred Cw
0
Allowable Cw
0.0
�rovri Oa tboy0
Moil l /VY
MO Y1 a r
yn b'c r� L
c,-L6
9/12/94 PAGE