NC0020443_Wasteload Allocation_19950712

NPDES DOCUMENT SCANNING COVER SHEET
NC0020443
Columbia WWTP
NPDES Permit:
Document Type:
Permit Issuance
~Wasteload
Allocation
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
201 Facilities Plan
Instream Assessment (67B)
Environmental Assessment (EA)
Permit
History
Document Date:
July 12, 1995
This document ie printed on remise paper - wore any
content on the reiirex a wide

NPDES WASTE LOAD ALLOCATION
r
PERMIT NO.: NC0020443
PERMITTEE NAME:
FACILITY NAME:
Town of Columbia
Town of Columbia WWTP
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 001
Design Capacity: 0.150 MGD
Domestic (% of Flow): 100
Industrial (% of Flow): 0 %
Comments: e04 ;N9 }-o ..,fib p o14 6.0 I -
RECEIVING STREAM:the Scuppernong River
Class: SC
Sub -Basin: 03-01-53
Reference USGS Quad: D 33 NE (please attach)
County: Tyrrell
Regional Office: Washington Regional Office
Previous Exp. Date: 3/31/98 Treatment Plant Class: II
Classification changes within three miles:
Requested by:
Prepared by:
Reviewed by:
Charles Alvarez
t %t-fir , 6&
Qlzij rid
Ft*G (� f
Date: 4/12/95
Date: -2
Date:
Modeler
Date Rec.
#
JcA
-13 9�
g
2
Drainage Area (mi )
AM
Avg. Streamflow (cfs): 7Z,0A L
7Q10 (cfs) ,,¢ Winter 7Q10 (cfs) /J/// 30Q2 (cfs) Af/
Toxicity Limits: IWC % / Acute/Chronic
Instream Monitoring: 6,in A.6 ex: 45 �1 �f'rn,� ‘0, o� iA
sir4 F 64e►10/;n5 A I m -er ;e3tef'1g
Parameters ,SPr. a iA4Ayic.nt -6c* < ec
Upstream ye$ Location (} S 1��� (( "'
Downstream ye.4 Location MAr'kzr it o
Recommended Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (141):
TP (mg/1):
TN (mg/1):
Comments:
Qw = 0.150 MGD
Monthly Average
Summer Winter
0.15 0.15
30
monitor
NL
30
200
6.8-8.5
monitor
monitor
monitor
30
monitor
NL
30
200
6.8-8.5
monitor
quarterly
quarterly
Qw = 0.30 MGD
Monthly Average
Summer Winter
0.30 0.30
15 15
4.0 4.0
6.0 6.0
30 30
200 200
6.8-8.5 6.8-8.5
28 28
monitor quarterly
monitor quarterly

F. DOWNSTREAM MONITORING REQURIEMENTS
PHYSICACPARAMETERSt:
Parameter Sample Type
Freauenc
Dissolved Oxygen v
Instantaneous
weekly
Temperature .
Instantaneous
weekly
Conductivity •
Instantaneous
weekly •
Salinity
•
Instantaneous
weekly
pH
•
Instantaneous
*
tThe above parameters shall be collected as grab samples at one foot intervals
vertically throughout the water column.
*pH shall be collected only when chlorophyll -a is collected.
CHEMICAL PARAMETERS#:
Parameter
Freauenc
TKN
twice per month
NH3
twice per month
NO2 +
•
NO3
twice per month
Total Nitrogen
twice per month
Total P
osphorus
twice per month
Chloro
hyll-a
twice per month
Fecal C
liform**
twice per month
# The above parameters, except Fecal Coliform, shall be collected via a spatial composite
throughtout the photic zone (defined as twice the secchi depth).
** Fecal Coliform shall be collected grab sample approximately 6" below the surface.
Samples shall be collected between June 1 and September 30 of each year.
STATION LOCATIONS: (see attached map detailing locations) L.
1) See location at end of pipe.
2) See upstream location on map.
3) See lownstream location on map.
REPORTING REQUIREMENTS:
Data entered on a form approved by the Division and summarized in an annual report due
by January first of the year immediately following the summer period when sampling
occurre .
Yearly monitoring reports shall be sent to:
Instream Assessment Unit
DEM Water Quality Section
PO Box 29535
Raleigh, NC 27626-0535

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D
WASH NGTONEOFFICE
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 WAS'IELOAD ALLOCATION
Request #: 8285
Town of Columbia WWTP
NC0020443
100% Domestic
Existion
Modification (expansion to 0.3 MGD)
Scuppernong River
SC
03-01-53
Tyrell
Washington
Charles Alverez
4/12/95
D33NE
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
MAY 3 • 1995
TIDAL
NA
NA
D. E. ICA.
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Past wasteload for Qw = 0.225 MGD recommended BPJ limits for BOD5/NH3N of 15/4 with DO
(minimum) = 6.0 mg/1 in order to minimize dicharge impacts on this area of the Scuppernong near
where documented water quality problems already exist. Current recommendation is for same BPJ
limits for 0.3 MGD in light of persistent low DO levels in the receiving waters, lower than levels
that could be attributed to swamp waters.
Special Schedule Requirements and additional comments from Reviewers:
/%'' 1kJ 7t1 4-1 vi �G' 1 Tvt,Al oG it�5if 44 f /yl Ai .eot)Gi
fui T5 1G 11oi gorJE 4fcaoy.
Recommended by:
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineering:
Lim.` CLIP
Date: 6 /2 (,0/�15
Date: b(//?S---
7/%-
RETURN TO TECHNICAL SUPPORT BY:
JUN 2 8 1995
Date:

ti
2
Fxisting Limits:
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Co1. (/100 ml):
pH (SU):
Residual Chlorine (141):
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 (4/1):
TP (mg/1):
TN (mg/1):
CONVENTIONAL PARAMETERS
Qw = 0.150 MGD
Monthly Average
Summer Winter
0.15 0.15
30 30
monitor monitor
NL NL
30 30
200 200
6.8-8.5 6.8-8.5
monitor monitor
monitor quarterly
monitor quarterly
Qw = 0.150 MGD
Monthly Average
Summer Winter
0.15 0.15
30 30
monitor monitor
NL NL
30 30
200 200
6.8-8.5 6.8-8.5
monitor monitor
monitor quarterly
monitor quarterly
h . D . T. • NONE
Change in 1 Q10 data
Change in stream classification
Relocation 'of discharge
Change in wasteflow
Other (onsi$e toxicity study, interaction, etc.)
Instream data
New regulations/standards/procedures
New facility information
Qw = 0.225 MGD
Monthly Average
Summer Winter
0.225 0.225
15 15
4.0 4.0
6.0 6.0
30 30
200 200
6.8-8.5 6.8-8.5
28 28
monitor quarterly
monitor quarterly
Qw = 0.30 MGD
Monthly Average
Summer Winter
0.30 0.30
15 15
4.0 4.0
6.0 6.0
30 30
200 200
6.8-8.5 6.8-8.5
28 28
monitor quarterly
monitor quarterly
WQ or EL
WQ
WQ
WQ
EL
EL
EL
EL
Parameter(s) Affected
_ Par eter(s) are water quality limited. For some parameters, the available load capacity of
the immedi to 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.

3
INSTREAM MONITORING REQUIREMENTS
Upstream Location: See Attachment
Downstream Location:
Parameters:
Special instream monitoring locations or monitoring frequencies:
Instream monitoring requirements should remain the same as in existing permit with the exception
of depth stratified saampling, which should be done at 1.0 meter intervals, rather than 1.0 foot
intervals in the water column.
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy 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?
Woltild 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 4ent to EPA? (Major) N (Y or N)
(If yes, then attach updated evaluation of facility, including toxics analysis, modeling analysis if
modeled at renewal, and description of how it fits into basinwide plan)
Additional Information attached? Y (Y or N) If yes, explain with attachments.
The page from the existing permit outlining instream monitoring requirements is attached.

F. DOWNSTREAM MONITORING REQURIEMENTS
PHYSICAL; PARAMETERSt:
Parameter
Sample Tvoe
Freauenc
Dissolved Oxygen
Instantaneous
weekly
Temperature
Instantaneous
weekly
Conductivity
Instantaneous
weekly
Salinity
Instantaneous
weekly
pH
Instantaneous
*
tThe above parameters shall be collected as grab samples at one-€osf intervals
vertically throughout the water column. mer
*pH shall be collected only when chlorophyll -a is collected.
CHEMICAL PARAMETERS#:
Parameter
Freauenc
TKN
twice per month
NH3
twice per month
NO2 + NO3
twice per month
Total Nitrogen
twice per month
Total Phosphorus
twice per month
Chlorophyll -a
twice per month
Fecal Coliform**
twice per month
# The above parameters, except Fecal Coliform, shall be collected via a spatial composite
throughtout the photic zone (defined as twice the secchi depth).
** Fecal Coliform shall be collected grab sample approximately 6" below the surface.
Samples shall be collected between June 1 and September 30 of each year.
STATION LOCATIONS: (see attached map detailing locations)
I) See location at end of pipe.
2) See upstream location on map.
3) See downstream location on map.
REPORTING REQUIREMENTS:
Data entered on a form approved by the Division and summarized in an annual report due
by January first of the year immediately following the summer period when sampling
occurred.
Yearly monitoring reports shall be sent to:
Instream Assessment Unit
DEM Water Quality Section
PO Box 29535
Raleigh, NC 27626-0535

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