NC0020354_Wasteload Allocation_19910621

NPDES DOCU ENT SCANNING COVER !SHEET
NPDES Permit:
NC0020354
Pittsboro WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Approval
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
June 21, 1991
This document is printed on reuse paper - igiu i e any
content on the resrerse side

NPDES WAS Ili LOAD ALLOCATION
PERMIT NO.: NC0020354
PERMITTEE NAME:
Town of Pittsboro / Pittsboro WastewaterTp
Facility Status: Existing
Permit Status: Renewal
Major
Pipe No.: 001
Minor
Design Capacity:
Domestic (% of Flow):
Industrial (% of Flow):
Comments:
0.75* MGD �"'�c,, /i/y 1"-A 5
or `'f
i- O .-7SMG-717on /y arc
100% ycu
STREAM INDEX: 16-38-(31
RECEIVING STREAM:
Class: C-NSW
Roberson (Robeson) Creek
Sub -Basin: 03-06-04
Reference USGS Quad: E22NW, Pittsboro
County: Chatham
Regional Office: Raleigh Regional Office
(please attach)
Previous Exp. Date: 9/30/91 Treatment Plant Class:
Classification changes within three miles:
ca. 5 mi.-> WS-III & B NSW
Requested by: Jule Shanklin
Prepared by:
Reviewed by: L":41-1-�-
u3isAEt✓ - wQ
III
A if
Date: 5/14/91
Date: 6//9/7/
Date: C44/.26/1 /
e19a
Modeler
Date Rec.
#Z4
DAG
S 15141
Co
Drainage Area (mil ) /Q •
Avg. Streamflow (cfs): //
7Q10 (cfs) 0. 0 Winter 7Q10 (cfs) Q. L 30Q2 (cfs) O• 67
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters etrnee2 timt., W.4 1 Ac-4/ Gd��
Upstream V Location /od ya cy'-- 4 //
Downstream '/ Location /o0yd.c cis eLr rr7(
Effluent
Characteristics
Summer
Winter
BOD5 (mom)
S' c
/d . O
NH3-N (mg/1)
/ 0
Z.
D.O. (mg/1)
6 , D
6.0
TSS (mg/1)
3a.O
30. O
F. Col. (/100 ml)
2400 .0
ftO. 0
pH (SU)
C. 0 — % O
a. D - J'. O
TP(myll)
2.o
2o4
TAJ (m y//)
rh •' 'Y
04�/
£M�2� (A-y/0)
M l
/ ,�'
pip,
FIB
sLi
L,,,
Comments: le tot'/y �e fe— el wet icy. m�%S .
0
gam- -_

tit
.ED •
�.� �\
r
1
•
•
., 450 -
1
. 2157 •
•
1
720 000
FEET
3955
/7, —c�
•.
360 4 •x
9954
42'30"
i.3953
3952
'951
3950
C5B0�o
P, \ o WE:

A. (3). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Summer (April 1 - October 31)
During the period beginning January 1, 1990 and
authorized to discharge from outfall(s) serial
monitored by the Permittee as specified below:
Effluent Characteristics
lasting until expansion above 0.25
numbers) 001. Such discharges
Discharge Limitations Monitoring
Kg/day (lbs/day)
Monthly Avg. Weekly Avg.
Flow
BOD, 5Day, 20 Degrees C**
Total Suspended Residue**
NH3 as N
Dissolved Oxygen (minimum)
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Other Units (Specify)
Monthly Avg. Weekly Avg.
0.25 MGD
8.0 mg/1 12.0 mg/1
30.0 mg/1 45.0 mg/1
4.0 mg/1 6.0 mg/1
6.0 mg/1 6.0 mg/1
1000.0/100 ml 2000.0/100 ml
2.0 mg/1***
Measurement
Frequency
* Sample locations: E - Effluent, I Influent, U - Upstream, D - Downstream
**
*arts
Continuous
2/month
2/month
2/month
Weekly
2/month
Daily
Weekly
Quarterly
Weekly
The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not
respective influent values (85% removal).
Quarterly Average Limitation.
MGD, the Permittee i.
shall be limited and
Requirements
Sample
Type
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
*Sample
Location
I or E
E, I
E, I
E
E, U, D
E, U, D
E
E, U, D
E
E
exceed 15% of the
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be
monitored 2/month at the effluent by grab sample.
There shal '�Eo .at
of floating solids or visible foam in other than trace
ILC
•
amounts.
NC0020354

A. (4). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Winter (November 1 - March 31)
During the period beginning January 1, 1990 and lasting until expansion
authorized to discharge from outfall(s) serial number(s) 001. Such
monitored by the Permittee as specified below:
Effluent Characteristics Discharge Limitations
Kg/day (lbs/day)
Monthly Avg. Weekly Avg.
Flow
BOD, 5Day, 20 Degrees C**
Total Suspended Residue**
NH3 as N
Dissolved Oxygen (minimum)
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
M3
* Sample locations:
Other Units (Specify)
Monthly Avg. Weekly Avg.
0.25 MGD
16.0 mg/1 24.0 mg/1
30.0 mg/1 45.0 mg/1
8.0 mg/1 12.0 mg/1
6.0 mg/1 6.0 mg/1
1000.0/100 ml 2000.0/100 ml
2.0 mg/1***
above 0.25 MGD, the
discharges shall be
Permittee is
limited and
Monitoring Requirements
Measurement
Frequency
E - Effluent, I - Influent, U - Upstream, D - Downstream
The monthly average effluent BOD5 and Total Suspended Residue
respective influent values (85% removal).
*** Quarterly Average Limitation.
The pH shall not be less than 6.0
monitored 2/month at the effluent by grab
There shall be no discharge of floating
standard units
sample.
solids or visible
Continuous
2/month
2/month
2/month
Weekly
2/month
Daily
Weekly
Quarterly
Weekly
concentrations
nor greater than
foam in other than
Sample
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
*Sample
Location
I or E
E, I
E, I
E
E, U, D
E, U, D
E
E, U, D
E
E
shall not exceed 15% of the
9.0 standard, units and shall be
trace amounts.
NC0020354

A. (5). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Summer (April 1 - October 31)
During the period beginning after expansion above 0.25 MGD and lasting until expiration,
the Permittee is authorized to discharge from outfall(s) serial number(s) 001. Such
limited and monitored by the Permittee as specified below:
Effluent Characteristics
Discharge Limitations Monitoring
Kg/dap (lbs/day)
Monthly Avg. Weekly Avg.
Flow
BOD, 5Day, 20 Degrees C**
Total Suspended Residue**
NH3 as N
Dissolved Oxygen (minimum)
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Conductivity
Other Units (Specify)
Monthly Avg. Weekly Avg.
0.75 MGD
5.0 mg/1 7.5 mg/1
30.0 mg/1 45.0 mg/1
2.0 mg/1 3.0 mg/1
6.0 mg/1 6.0 mg/1
1000.0/100 ml 2000.0/100 ml
2.0 mg/1***
Measurement
Frequency
Continuous
2/month
2/month
2/month
Weekly
2/month
Daily
Weekly
Quarterly
Quarterly
Weekly
discharges shall be
Requirements
Sample
Type
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
Grab
Sample
Location
I or E
E, I
E, I
E
E, U, D
E, U, D
E
E, U, D
E
E
E, U, D
* Sample locations: E - Effluent, I - Influent, U - Upstream above discharge point, D - Downstream (1) 1.3
miles below discharge at State road to the North, or (2) 1.6 miles below discharge at unpaved road to the South
** The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the
respective influent values (85% removal).
*** Quarterly average limitation.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be
monit.oe onth at the effluent by grab sample.
a. ;
There"s al'1 o discharge of floating solids or visible foam in other than trace amounts.
M3 NC0020354

A. (6). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Winter (November 1 - March 31)
During the period beginning after expansion above 0.25 MGD and lasting until expiration,
the Permittee is authorized to discharge from outfall(s) serial number(s) 001. Such discharges shall bL
limited and monitored by the Permittee as specified below:
Effluent Characteristics
Discharge Limitations Monitoring
Kg/day (lbs/day) Other Units (Specify)
Monthly Avg. Weekly Avg. Monthly Avg. Weekly Avg.
Flow
BOD, 5Day, 20 Degrees C**
Total Suspended Residue**
NH3 as N
Dissolved Oxygen (minimum)
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Conductivity
0.75 MGD
10.0 mg/1 15.0 mg/1
30.0 mg/1 45.0 mg/1
4.0 mg/1 6.0 mg/1
6.0 mg/1 6.0 mg/1
1000.0/100 ml 2000.0/100 ml
2.0 mg/1***
Measurement
Frequency
Continuous
2/month
2/month
2/month
Weekly
2/month
Daily
Weekly
Quarterly
Quarterly
Weekly
Requirements
Sample
Type
Recording
Composite
Composite
Composite
Grab
Grab
Grab
Grab
Composite
Composite
Grab
*Sample
Location
I or E
E, I
E, I
E
E, U, D
E, U, D
E
E, U, D
E
E
E, U, D
Sample locations: E - Effluent, I - Influent, U - Upstream above discharge point, D - Downstream (1) 1.3
miles below discharge at State road to the North, or (.2) 1.6 miles below discharge at unpaved road to the South
The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the
respective influent values (85% removal).
Quarterly average limitation.
The pH l�� -'s�, t be less than 6.0 standard
monitoret, m"3it the effluent by grab sample.
M3 ThereA all be no harge of floating solids
P..1 �
_-
units nor greater than 9.0 standard units and shall be
or visible foam in other
than trace
amounts.
NC0020354

GKEX88/MP
COMPLIANCE EVALUATION ANALYSIS REPORT
05/i3/9i
PAGE i
PERMIT--NCO020354 PIPE--OOi REPORT PERIOD: 9004-9103 LOC---E
'FACILITY--PITT%BORO WWTP, TOWN OF DESIGN FLOW-- .7500 CLASS--3
LOCATION--PITT%BORO REGION/COUNTY--05 CHATHAM
50050 0000 00530 006iO 31616 50060 00300 060i0
MONTH Q/MGD BOD RE%/T%% NH3+NH4- FEC COLT CHLORINE DO TEMP
LIMIT % .4650 % 8.00 % 30.0 % 2.00 % 1000.0 NOL % 6.00 NOL
90/04 .3336 3.50 53 .45 12.0 .552 7.32 15.96
90/05 .3531 4.8O 4.4 .62 5.5 .472 6.87 i8.45
90/06 .2274 2.30 2.7
90/07 .1932 1.75 4.1
.O9
.O5
.0 .442 7.55 21.23
7.4 .357 7.67 23.84
90/08 .2072 3.95 3.8 .25 .O .430 7.40 25.04
90/09 .1874 1.70 3.2 .07 186.2 .000 7.92 24.52
LIMIT F .2500 F 8.00 F 30.0 F 4.00 F 1000.0 NOL F 6.00 NOL
90/iO .3440F 2.70 1.6 .i8 24.2 .Oi2 8.20 20.80
LIMIT F .2500 F 16.00 F 30.0 F 8.00 F 1000.0 NOL F 6.00 NOL
98/ii .2685F 1.70 1.7 .33 .O .0OO 9.24 17.00
LIMIT F .2500 F 16.00 F 30.0 F 2.00 F 1000.0 NOL F 6.00 NOL
90/12 .3033F 2.45 2.3 .06 94.9 .000 8.95 14.25
LIMIT F .7500 F 5.00 F 30.0 F 2.00 F iOOO.O NOL F 6.00 NOL
9i/Oi .4102 3.iO 3.9 .21 2.2 .0O0 9.55 12.00
91/02 .2543 4.20 1.8 .07 .O .00O 9.66 12.4O
91/03 .4750 7.00F 2.0 .24 i5.O .000 9.70 i5.37
AVERAGE .2964 3.26 3.0 .21 28.9 .i88 8.33 i8.4O
MAXIMUM 1.3806 7.40 5.6 .87 14240.0 1.800 10.40 28.00
MINIMUM .1377 1.20 .7 .01 .O .00O 6.80 iO.00
UNIT MGD MG/L MG/L MG/L 0/100ML MG/L MG/L DEG.0

KEX'1-3/MP
COMPLIANCE EVALUATION ANALYSIS REPORT
O5/13/9i
PA(*.;E 2
^ PERMIT--NC0020354 1:1IPE-~00i REPORT PERIOD: 9004-9103 LOC~--E
FACILITY .... .... PITT%BORO WWTP/ TOWN OF DESIGN FLOW-- .7500 CLA%%--3
LOCATION .... .... PITT%BORO RE�ION/COUNTY--05 CHATHAM
00400 08600 O0665
MONTH PH TOTAL N PHO%-TOT
LIMIT 9.0 6.0
90/04 6.7-6.6
90/05 6.9-6.7
LIMIT 9.0 6.0 NOL NOL
90/06 6.9-6.9 18.8O0 1.8700
90/07 7.2-7.1
90/08 7.2-7.2
90/09 7.3--- 7.2 11^700 3.1900
LIMIT 9.0 6.0 NOL F 2.0O00
90/i0 7.i-7.1
LIMIT 9.0 6.0 NOL F 2^8000
90/11 7.1-6^9
LIMIT 9.0 6.0 NOL F 2.O000
90/12 6.9-6.8 21~800 1.7300
LIMIT 9.0 6.0 NOL F 2.0000
9i/01 7^1-7.1
LIMIT 9^0 6^0 NOL NOL
91/02 7^O-6.7 ^5500
91/03 7.2.... 6^3 3^540 i.2800
AVERAGE 13.960 1.7240
MAXIMUM 7.340 21^800 3.1900
MINIMUM 6.350 3.540 .5580
UNIT %U M�/L MG/L.

GKEX[T8/MP
COMPLIANCE EVALUATION ANALY%I% REPORT
O5/i3/9i
PAGE i
PERMIT--NC002O354 PIPE--OOi REPORT PERIOD- 89O4.... 9003 LOC--------- E
' FACILITY--PITT%BORO WWTP, TOWN OF DE%I�N FLOW-- .75O0 CLA%%--3
LOCAT ION--PITT%BORO REGION/COUNTY.... .... O5 CHATHAM
50050 00310 00530 00610 31616 50060 0030O 000i0
MONTH Q/MGD BOD RE%/T%% NH3+NH4- FEC COLI CHLORINE DO TEMP
LIMIT % .4650 % 8.00 s 30.0 % 2.00 % 1000.0 NOL % 6.00 NOL
89/04 .4183 5.35 5.7 ^66 i36.9 .455 7.42 14.64
89/O5 .3906 3.10 7.2 .47 35.i .600 7.50 17^38
89/06 .2864 2.30 4.9 .04 130.3 .309 7.38 21.00
89/07 .2747 2.95 4.3 .17 18.7 .440 7.02 22.85
89/08 .2207 i.75 3.2 ^O7 i32.8 .427 7.12 23.27
89/09 .2218 3.65 5.3 .20 85.0 .345 7.05 22.60
89/10 .3543 3.40 6.8 .08 34.i .490 7.80 19.45
LIMIT % .4650 % 16.00 % 30.O % 4.00 % 1000.0 NOL % 6.00 NOL
89/ii .3065 5.05 i0.9 .36 32.9 .435 7.50 16.64
89/12 .4877 3.20 6.2 .08 10.2 .565 8.02 12.36
90/01 .4iO3 3.0� 7.5 .08 4.8 .509 8.75 i1.79
90/02 .4474 3.60 5.5 .06 3.6 .785 7.20 12^72
90/03 ^4025 3.10 7.8 .05 .0 .55O 7.72 i3.77
AVERACIE .3451 3.37 6.2 .19 52.0 .492 7.54 17.37
MAXIMUM i.O4i3 6.4O 14.2 i.i5 615.0 i.800 9.1O 24.00
MINIMUM .i3i0 1.70 2.2 .03 .O .200 6.50 10.O0
UNIT MG*D MG/L MG/L MG/1- 01-/100ML MG/L. MG/L DEG.0

,
�CKEX88/MP
COMPLIANCE 1:..VALUAT%ON ANALY%I% REPORT
PAGE �
. PERMIT-~NCO02O354 PIPE--00i REPORT PERIOD` 8904-9O03 LOC---�
FACILITY~~P%TT%BORO WWTP, TOWN OF DE%I�N FLOW-- .7500 CLA%�--3
LOCATION .... .... PITT%BORO RE(1ION/COUNTY.... .... 05 CHATHAM
00400 00600 00665
MONTH PH TOTAL N PHO%-TOT
LIMIT 9.0 6.0
89/04 6^S.... 6.6
' LIMIT 9.0 6.0 NOL NOL
89/05 6.7.... 6^6 9^710 .7400
89/06 7.0.... 6.8 i.7300
89/07 6.8-6^7 17^100 1^8300
89/08 6.9-6.8
89/09 7.0-6^9
89/10 6.8-6.7 .8600
L.IMIT 9^0 6^0 NOL NOL
89/1i 6.8.... 6.7 8.460
89/12 6.8.... 6.8
90/0i 6.7-6.5
90/02 6.5-6.3
90/03 6^7-6^6 12^200 1^4200
AVERAGE ii.867 1.3160
MAXIMUM 7^O00 17^100 1.8300
MINIMUM 6.390 8.460 .7400
UNIT %U MG/L.. MG/L

-6KEXS8/MP
COMPLIANCE EVALUATION ANALY%I% REPORT
05/i3/91
PAGE i
PERMIT- .... NCOO2O354 PIPE- .... OOi REPORT PERIOD: 88O4--- 8903
' FACILIT Y-.... PITT%BORO WWTP, TOWN OF DE%IGN FLOW-- .7500 CLA%%--3
LOCATION .... .... PITT%BORO REGION/COUNTY--05 CHATHAM
5OO50 00310 00530 00610 31616 50060 00300 00010
MONTH Q/MGD BOD RE%/T%% NH3+NH4- FEC COLI CHLORINE DO TEMP
LIMIT F .2500 F 8.00 F 30.0 F 4^O0 F 1000.0 NOL F 6.00 NOL
88/04 .2852F 6.15 5.4 .89 2.8 .630 7.44 i5.65
88/05 .2275 6^65 4.5 .85 2.2 .428 8.00 19.16
88/06 .2013 1.40 2.2 .09 .O ^450 8.05 22.11
88/O7
.i7O4 2^65
i.9 .O5
4.2
.455
7.82 24.05
88/08 .i633 i.25 2.O .0i 14.7 .386 7.70
�� Cz 4
88/09 .2075 2.40 1.9 .54 ^O .475 6.95 23.17
88/iO .25i2F 0 i.95 3.3 .7 i8.0 .438 8.45 18.90
LIMIT % .4650 F i6.00 F 30.O F 8.00 % i000.0 NOL F 6.O0 NOL
88/11 .2765 1.80 1.7 .04 3.6 .635 8.40 16.10
LIMIT % .4650 % 16.0O % 30.0 % 4.00 % 1000.0 NOL % 6.00 NOL
88/12 .2396 3.05 4^0 .07 10.2 .410 9.45 13.20
89/01 .2554 3.95 7.7 .05 25.7
89/02
.4370 4.25
5.5
.36i
8.75 12.90
.04 42.0 .660 8.40 ii.97
89/O3 .53OOF 5.40 6.5 .3O 2.6 .595 8.i8 ii.70
AVERA�E .2704 3.40 3.8 .25 10.5 °493 8.i3 17.87
MAXIMUM i.i802 8.00 8.6 1.70 220.0 2.000 9.60 26.00
MINIMUM .i369 1.00 1.4 .Oi .0 .200 6.30 9.00
UNIT MGD MG/L MG/L MG/L #/100ML MG/L MG/L DEG.0

~
`�KEX88/MP
COMPLIANCE EVALUATION ANALY%I9 REPORT
0':5/13/9i
PACE 2
PERMIT--NC002O354 PIPE--00i REPORT PERIOD: 88O4.... 8903 LOC---E
^FACILITY- ---- PITT%BORO WWTP, TOWN OF DE%ICN FLOW-- ^7500 CLA%%--3
LOCATION --- ---- PITTEll ORO REGION/COUNTY--- --- O5 CHATHAM
00400 00600 00665
MONTH PH TOTAL N PHO%-TOT
LIMIT 9.O 6.0 NOL
88/04 6^9-6^8 1.4000
LIMIT 9^0 6.0 NOL NOL
88/05 6.9-6.8 1.9500
88/06 7.2.... 7^2 1.880 2.460O
88/07 7^1.... 7^i 2.5000
88/08 7.3.... 7.2 2.600O
LIMIT 9.0 6.0 NOL F 2.0000
88/09 7^1-6^9
LIMIT 9.0 6.0 NOL NOL
88/10 7.1-6.9 .9600
LIMIT 9.0 6.0 NOL F 2^0000
88/ii 6.7--- 6.7
LIMIT 9.0 6.0 NOL NOL
88/12 6.8-6.8 2i^�O0 1.6000
89/81 6.8-6^7 1.7208
89/02 6.7-6.6
89/03 6^8.... 6.7 i.0600
AVERAGE _.... .... .... 1i.440 1^8O55
MAXIMUM 7.3O0 21^000 2^6000
MINIMUM 6.600 1.880 ^9600
UNIT %U MG/L MG/L..

Cv . /
RECEIVED
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
Request #
WWTP
Town of Pittsboro/Pittsboro
NC0020354
Domestic - 100%
Existing
Renewal
Roberson Creek
C-NSW
030604
Chatham
Raleigh Regional Office
Shanklin
5/14/91
E22NW
MAY 301991
62stilFro4r` Pi_ 0Fr!(;
A'
_�._ E
J UN 1 'r 1991
Stream Chziracteristic:
USGS #
Date:
Drainage Area:
Summer 7Q10:
Winter 7Q10:
Average Flow:
30Q2:
_,'if.
02.0970.6900
1988
10.3
0.0
0.4
11.0
0.6
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Facility now discharging under expanded limits. Choice of an ammonia limit or a chronic toxicity
test should be given to the facility. Downstream sampling station is different from that specified in
permit. Is this acceptable to the region?
Fecal coliform limit changed to 200/100 mi. Letter has been prepared regarding the potential
toxicity of residual chlorine.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by:
Reviewed by
Instream Assessment: 0a.A..6,1Sa,l,Lotutr,)-6-vs- Date: `)/c9c//9 /
66 Regional Supervisor:
Permits & Engineering: Date:
Di*a-•
Date: 5/24/19/
Date: ‘//x/5/
RETURN TO TECHNICAL SERVICES BY: JUN 2 7 1991
1& - . , A)-- ffrikt,�S-c�..�Dn-r a-m- .auA_ ,l c.•u-�f �5�,.�,�er--1. o s/ — kr2- `fie �
�o " dl� l0 91 n1"_ _
i -�Xi ;fir C 1 l

2
Existing Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 ml):
pH (SU):
Conductivity (µmhos/cm2):
TP (mg/1):
TN (mg/1):
Residual Chlorine (µg/1):
Temperature (°C):
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 ml):
pH (SU):
Conductivity (1.1mhos/cm2):
TP (mg/1):
TN (mg/1):
Residual Chlorine (µg/1):
Temperature (°C):
Chronic Toxicity Test:
PARAMETERS
Monthly Average
Summer Winter
0.75 0.75
5.0 10.0
2.0
6.0
30.0
1000.0
6.0-9.0
monitor
2.0*
monitor
monitor
monitor
Monthly
NH3 Li
Summer
0.75
5.0
1.0
6.0
30.0
200.0
6.0-9.0
monitor
2.0*
monitor
monitor
monitor
Limit Changes Due To:
Change in 7Q10 Data
Change in stream classification
Change in wasteflow
Failing toxicity test
Ammonia Toxicity
Other
4.0
6.0
30.0
1000.0
6.0-9.0
monitor
2.0*
monitor
monitor
monitor
Average with
mit
Winter
0.75
10.0
.1g1•3
6.0
30.0
200.0
6.0-9.0
monitor
2.0*
monitor
monitor
monitor
Monthly Average with
toxicity test
mmer Winter
0. 5 0.75/
5. 10�
2.0 4.
6.0 6.,0
30.0 30.0
200.0 00.0
6.0-9.0 .0-9.0 U
monitor onitor
2.0*
monitor moni
monitor monito
itor monitor
@99%P/F @99%
Parameters Affected
Fecal coliforms
INSTREAM MONITORING REQUIREMENTS:
Upstream: Roberson Ck. x Location:
Downstream: Roberson Ck x Location:
100 yds. upstream of discharge
100 yds. downstream of discharge
Parameters: Dissolved oxygen, fecal coliform, temperature, conductivity

10/89
Facility Name /)t/ 1 / % ` ° Permit
CI:` TOXICITY MONITORING REQUIREN1FN"1 !(,)IZ"1-R l_
1.) The North Carolina Ceriodaphnia chronic effluent bioassay
Bioassay Procedure - Revised `September 1989) or subsequent versions, using full range option
outlined in Appendix A.
The test concentral..9tris for this test series will be established around the instream waste
concentration of . 77 % by factors of three as outlined in Appendix A. The permit holder shall
perform quarterly monitoring using this procedure to establish compliance with the permit
condition. The t test will be perfoues1 after thirty days from the issuance of this permit during
the months of •/NOV.,, / • . Effluent sampling for this testing shall be
performed at the NPDES ermitted�final effluent discharge below all treatment processes.
� g
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 THP3B. Additionally, all testing results will 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 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• G cfs
Permitted Flo MGD
IWC% /00
Basin & Sub -basin CPI- O 30604
Receiving Stream kft4t4sem C/«4-
County 'Llc fluttn
Recommended by:
Date 5/ z-
q1
/4076-eA-
**Chronic Toxicity (Cerio) ChV Monitoring at %,P 4 ee Part , Condition

TOWN OF PITTSBORO - Allowable Waste Concentrations
SUMMER
Residual Chlorine
Ammonia as NH3
7Q10 (CFS)
0
7Q10 (CFS)
0
DESIGN FLOW (MGD)
0.75
DESIGN FLOW (MGD)
0.75
DESIGN FLOW (CFS)
1.1625
DESIGN FLOW (CFS)
1.1625
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (UG/L)
0
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
100
IWC (%)
100
Allowable Concentration (ug/1)
17
Allowable Concentration (mg/l)
1
WINTER
Residual Chlorine
Ammonia as NH3
7010 (CFS)
0.4
7010 (CFS)
0.4
DESIGN FLOW (MGD)
0.75
DESIGN FLOW (MGD)
0.75
DESIGN FLOW (CFS)
1.1625
DESIGN FLOW (CFS)
1.1625
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL (UG/L)
0
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
74.4
IWC (%)
74.4
Allowable Concentration (ug/I)
22.849462
Allowable Concentration (mg/I)
2.343656
NC0020354
DAG 5/21/91

t1coG 20354
5001R-Pc or lotAlil PT grroc,;0;c &14,06
65E29/%1 Zieel:=1‘
ettA) O.75c
40300 04
02.0-10•(9ao (1�1(Rk
wu of i?rr oR0 <&Nu - .75Nc-o)
DA,- 10.3 niz
57a10 -- 0.0
h17G,10 = 0. c$s
30Q Z = C. 6 c.f

STREAM DATA
INSTREAM SELF -MONITORING DATA
MONTHLY AVERAGES
Discharger: rifi-Stia
Receiving Stream: PaPJei2 € c
Upstream Location: WO vns-. tAr's rtcAwt
DATE
Dec-91
Nov-91
Oct-91
Sep-91
Aug-91
Jul-91
Jun-91
May-91
Apr-91
Mar-91
Feb-91
Jan-91
Dec-90
Nov-90
Oct-90
Sep-90
Aug-90
JuI-90
Jun-90
May-90
Apr-90
Mar-90
Feb-90
Jan-90
Dec-89
Nov-89
Oct-89
Sep-89
Aug-89
JuI-89
Jun-89
May-89
Apr-89
Mar-89
Feb-89
Jan-89
TEMP
D.O.
COLD
Permit No. r20061-1'
Sub -basin:
Downstream Location: vit) a `9 . G M
FECAL COLI.
13.
/0
/0.3
38 e'
7,s
/I0
9.7
9, 7
izq
3Z
9.0
/7.S
U..3
/9. S
/s
bco
/75
/S'
lGC.
III
/off
3
9,S
67
z/-7/
4S
TEMP
D.O.
COND.
FECAL CO
PIS
,q.. 4L
9.1
_ •I/ / •
9. LL
/o. s
/te.;,,
G�
g 2.
/o. q
:14 Z
265-
//
9; 7
' /Rr
9E
/ 3
i S
25a
'70
17
G,4
g
473
Z/.3
6.e
5/
/ `f
`f-
6. • 6
343
v.k 7
, p
35-2,
92
zo.6
7 o
/7y
/44 /
/9. z
7, 3
/49
77-4
/6" &
g, ?
/ c c
/`'. /
/3
9_6-
/74'
z2
Page 1

To: Permits and Engineering Unit
Water Quality Section
RFCEIVED
JUN 1 9 1991
TECNIiiL'AL SUPPORT BRANCH
DATE:
NPDES STAFF REPORT AND RECOMMENDATIONS
COUNTY:
Chatham
PERMIT NUMBER: NC0020354
PART I - GENERAL INFORMATION
1. Facility and Address:
2.
3.
4.
Date of Investigation:
Town of Pittsboro WWTP
P.O. Box 753
Pittsboro, NC 27312
site visit April 11, 1991
June 17`, 1991
Report Prepared by: Carol Stephens, Environmental Technician
Person Contacted & Telephone Number: Hammond Snyder
[phone]
5. Directions to Site: Hwy 64 west; left onto Small Street;
Plant is at the end of the extension
6. Location of Discharge Point (see attached USGS map extract with
discharge point indicated).
a. USGS Quad Number: E22NW USGS Quad Name: Pittsboro, NC
b. Latitude: 35°42'50" Longitude: 79°10'12"
7. Size (land available for expansion and upgrading):
limited area available
8. Topography (including relationship to 100-year flood plain):
not located in the flood plain
9. Location of Nearest Dwelling:
several within 1000 feet

10. Description of Receiving Stream or Affected Surface Waters.
a. Name: Roberson Creek
b. Classification: C NSW
c. River Basin and Subbasin Number: 03-06-04
d. Receiving Stream Features and Pertinent Downstream Uses:
stream flows into Jordan Lake
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Description of Wastewater.
a. Type of Wastewater: 100 % Domestic
0 % Industrial
b. Volume of Wastewater (design capacity): 0.750 MGD
2. Pretreatment Program Status: In Development
Approved
Should Be Required
X Not Needed
5. Treatment System Information.
a. Status of Treatment System: X Existing
Proposed
b. Description of Treatment System: mechanical barscreen,
grit removal, diffused aeration basins, clarifiers,
Phosphorus removal, high rate sand filters, sludge
thickening, aerobic sludge digestion, UV disinfection,
and cascade post aeration

• 6. Residual Solids Treatment and Disposal Method: land application
7. Treatment System Classification (rating sheet attached, if
appropriate): IV
8. Codes.
a. SIC Code: 4952
b. Wastewater Code: 01
9. Treatment System Compliance Status: compliant
PART III - OTHER PERTINENT INFORMATION
1. Is This Facility Being Constructed With Construction Grants
Funds? NA
2. Special Monitoring Requests:
3. Additional Effluent Limits Requests:
4. Other: Mr. Snyder opted for the more stringent ammonia
effluent limt instead of a toxicity requirement. See wasteload
allocation.
PART IV - EVALUATION AND RECOMMENDATIONS
The Raleigh Regional Office recommends renewal of this permit.
Repo Writer
Regional Water Quality Survisor
4//10/9/
Date
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