NC0050105_Wasteload Allocation_19920701

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0050105
PERNIITTEE NAME:
FACILITY NAME:
PWC - City of Fayetteville
Rockfish Creek WWTP
Facility Status: Existing
Permit Status:
Renewal,
Major
Pipe No.: 001
Minor
Design Capacity: 6.0 MGD
Domestic (% of Flow): 99 %
Industrial (% of Flow): 1 %
Comments:
Existing limits for 6.0 and 12.0 MGD. Requested new limits at 7.0 and
12.0 MGD which Tech. Sup. denied. Requesting limits now for 6.0
and 12.0 MGD.
RECEIVING STREAM: Cape Fear River
Class: C
Sub -Basin: 03-06-15
Reference USGS Quad: H23NE (please attach)
County: Cumberland
Regional Office: Fayetteville Regional Office
Previous Exp. Date: 9/30/92 Treatment Plant Class: Class IV
Classification changes within three miles:
No change within three miles.
Requested by: Randy Kepler
Prepared by: / dirt,14:IAi/
Reviewed by: 0/1(00.A49-e-Y
kr vr`i.ab � 27 M"6moigiµ - u 5�
Date: 4/20/92
Date: 6/3/g2
Date: 6/SO/ q•--
�? fZ ruG
Opu15_2_51 A'A$oD,,,
Modeler
Date Rec.
#
*&
4t1c
/0bgS
Drainage Area (mi2 ) i71 2t Avg. Streamflow (cfs): S
7Q10 (cfs) o76—Winter 7Q10 (cfs) 770 30Q2 (cfs) 700
/• To `MG v
Toxicity Limits: IWC y.1 % eiZMGc? Acut hronic
Instream Monitoring:
Parameters PO /2.,jPC?/ 12 d
Upstream � Zif," Location a iway R7
Downstream �a ' c Location1200 yds. trc .41z7A—m
Effluent
Characteristics
AT:Eagitipi n
.5,,,r„„,, ► krrix-
^Fri c
. vnww4,- Wivefe
BOD5 (mg/1)
/ Z v7
/ Z
NH3-N (mg/1)
2 2/
/ 2—
D.O. (mg/1)
5. 6.
c.
TSS (mg/1)
30 .30
cC
F. Col. (/100 ml)
2cp 0.00
260 2-CC)
pH (SU)
C'% —.7
a—Gl C=cf
�npva7t(°C)
-1A/ (029/0
liivij Ma_ pat.
41 4t(.
.Dials%S oni� .
24-ad ��J&al%2 2
Comments:

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 # 6885
PWC - City of Fayetteville/Rockfish Creek WWTP
NC0050105
Domestic - 99%/Industrial - 1 %
Existing
Renewal
Cape Fear River
C
030615
Cumberland
Fayetteville
Kepler
4/20/92
H23
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Stream Characteristic:
USGS #
Date:
Drainage Area:
Summer 7Q10:
Winter 7Q10:
Average Flow:
30Q2:
%IWC@6MGD:
% IWC @ 12MGD:
OLD WLA
1990
4420
675
970
4460
900
1.4
2.7
Scoville did the last WLA in 1990. Permit should be reissued with the same limits and
monitoring requirements with the addition of monitoring for copper and lead. Copper was found
in the PPA at concentrations which warrant continued monitorin Lead should be sampled at all
major municipalities. pi /e ifw W i W se # re . 'Me c4 " c/fir ire. . FQel //1y 4 441
Afulyze um42aft eap ;.-, ur
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: 2'rtI-
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineering:
RETURN TO TECHNICAL SERVICES BY:
Date:
Date: S .. L a
Date:7.:42
Date: G//‘-°/4-7
JUN 2 5 1992
10423V1111)
ENV. MANAGEMENT
rAYETTEVILLE REG. OFFICF

2
PARAMETERS
Existing Limits: Monthly Average
Summer Winter Summer Winter
Wasteflow (MGD): 6 6 12 12
BOD5 (mg/1): 12.0 24.0 6.0 12.0
NH3N (mg/1): 2.0 4.0 1.0 2.0
DO (mg/1): 6 6.0 rj 41.0 6.0 6.0
TSS (mg/I): 30.0 30.0 30.0 30.0
Fecal Co1. (/100 ml): 200.0 200.0 200.0 200.0
pH (SU): 6.0-9.0 6.0-9.0 6.0-9.0 6.0-9.0
Temperature (°C): monitor monitor monitor monitor
TP (mg/1): monitor monitor monitor monitor
TN (mg/I): monitor monitor monitor monitor
Residual Chlorine (RA): monitor monitor monitor monitor
Chronic Toxicity: P/F @ 1.4% P/F @2.7%
(Jan,Apr,Jul,Oct) (Jan,Apr,Jul,Oct)
Recommended Limits: Monthly Average
Summer Winter Summer Winter
Wasteflow (MGD): 6 6 12 12
BOD5 (mg/1): 12.0 24.0 6.0 12.0
NH3N (mg/1): 2.0 4.0 1.0 2.0
DO (mg/1): 1.0 S0 6.0 6.0
TSS (mg/1): 30.0 30.0 30.0 30.0
Fecal Co1. (/100 ml): 200.0 200.0 200.0 200.0
pH (SU): 6.0-9.0 6.0-9.0 6.0-9.0 6.0-9.0
Temperature (°C): monitor monitor monitor monitor
TP (mg/1): monitor monitor monitor monitor
TN (mg/1): monitor monitor monitor monitor
Residual Chlorine (µg/1): monitor monitor monitor monitor
Copper (1.tg/1): monitor monitor monitor monitor
Lead (pg/1): monitor monitor monitor monitor
Chronic Toxicity: P/F @ 1.4% P/F @2.7%
(Jan,Apr,Jul,Oct) (Jan,Apr,Jul,Oct)
Limits Changes Due To: Parameter(s) Affected
Change in 7Q 10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data
New regulations/standards/procedures x Lead
New facility information (PPA) x Copper
x 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.

3
INSTREAM MONITORING REQUIREMENTS
Upstream Location: Cape Fear River at Highway 87
Downstream Location: Cape Fear River approximately 200 yards upstream of Lock & Dam No. 3
Parameters: BOD5, Temperature, Fecal, Conductivity, Dissolved Oxygen
Special instream monitoring locations or monitoring frequencies:
Note the requirement to sample for BOD5 upstream and downstream of the discharge.
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 V 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?
Wasteload sent to EPA? (Major) (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? (Y or N) If yes, explain with attachments.
• MAP cc-- R-Ge
- INLAt io7-�s
▪ Spc C u LA-TA/6 LI AA rS (M O )

Facility Name I a IF 1,47i)t-nre/fisc o%P! r f •Permit # 50/0 #
Pe
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 a uent concentration at which there may be no observable inhibition of reproduction or significant mortality
is o (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 samplingfor this testingshall be performed at the NPDES
Jam^
permitted final euent 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 675- cfs
Permitted Flow MGD Recommended by:
IWC (.4
Basin & Sub -basin GPI- D3't 6
Receiving S C APC Li t/6 2-
Coun &c=Q.r�t Date S151IL
County
QCL PIF Version 9191

Facility Name 41?r7771/Itte '&/flI CK . Permit # Pipe#
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 4? , '7 % (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
guarter(v monitoring using this procedure to establish compliance with the permit condition. The first test will be
peJ�ed after thirty daysfrom the effectivedate of this permit during the months of
r �! 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 7cfs
Permitted Flow 12i MGD Recommended by:
IWC 2. 1 % --,,
Basin & Sub -basin GPr b 36'6. r f d'�;�� -`'';' �'tr U�
Receiving Stream Can F_ Fr 4.-C.-.. PW _. �7 County rya IN5 au Date 05 `J
QCL PIF Version 9/91

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FAYETTEVILLE ROCKFISH CREEK WWTP - Allowable Waste Concentrations
}SUMMER
Residual Chlorine
V Ammonia as NH3
.}, f:::::::Y.•
7Q10 (CFS)
675t?
'
675
7Q10 (CFS
DESIGN FLOW (MGD)
12-J :DESIGN FLOW (MGD)
12
DESIGN FLOW (CFS)
18.6 r• .:DESIGN FLOW (CFS)
18.6
STREAM STD (UG/L)
17.0 STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (UG/L)
0?{: UPS BACKGROUND LEVEL (MG/LL
0.22
IWC (%)
J
2.6816609 try < IWC (%)
2.681661
Allowable Concentration (ug/I)
633.93548
*g{Allowable Concentration (mg/I)
29.30645
: WINTER
Ammonia as NH3
ti?• •{h
} 17Q10 (CFS)
970
r.DESIGN FLOW (MGD)
ry:
12
JZ{}Y}
• { DESIGN FLOW (CFS)
18.6
<vJ;'giSTREAM STD (MG/L)
• J�tiJ
1.8
$ UPS BACKGROUND LEVEL (MG/L1
0.22
IWC (%)
1.881449
J:L J'1J
:.}.!Allowable Concentration (mg/I)
84.19785
NC0050105
DAG 5/5/92

CITY OF FAYETTEVILLE (ROCKFISH CK) - Allowable Waste Concentrations for Toxicants
4-r .4c
7Q10=
675
Qa=
4460
Qw (in cfs)=
9.3
PARAMETER
FEDERAUSTATE STANDARD
ALLOWABLE EFF. CONC.
ACTUAL EFF. CONC.
ACTION
(lug/1)
WO)
(4/1)
Copper*
7
515.06
20
monitor
Chloroform
470.8
226252.31
10
none
Zinc*
50
3679.03
13
none
"Standards" are actually action levels.
5/5/92

CITY OF FAYETTEVILLE (ROCKFISH CK) - Allowable Waste Concentrations for Toxicants
Ai /ZMC-,c
7010.
675
Qa=
4460
Qw (in cfs)=
18.6
PARAMETER
FEDERAUSTATE STANDARD
ALLOWABLE EFF. CONC.
ACTUAL EFF. CONC.
ACTION
(µg/i)
WA)
(µg/I)
Copper*
7
261.03
20
monitor
Chloroform
470.8
113361.55
10
none
Zinc*
50
1864.52
13
none
*"Standards" are actually action levels.

DIVISION OF ENVIRONMENTAL MANAGEMENT
August 9, 1989
MEMORANDUM
TO: Mick Noland
FROM: Mike Scoville KO
THRU: Tom StocktonlV
Trevor Clements
SUBJECT: Speculative Limits For the Fayetteville PWC Rockfish Creek WWTP
(NPDES No. NC0050105, Cumberland County) .
Per your request, I have performed a modeling analysis of the proposed
expansion of Fayetteville's Rockfish Creek WWTP. The model used was a
QUAL2EU representation of the Cape Fear River from the Cross Creek WWTP to
Lock & Dam #3. The modeling framework is an adaptation of a modified Lev-
el-b model that was previously developed to separate the effects of orga-
nic-N hydrolysis and NH3-N oxidation. The new model incorporated the same
inputs as the old allocation model (used for the expansion of the Cross
Creek WWTP), and gives predictions of CBOD and DO to within 0.04 mg/1 of
that model. I evaluated proposed wasteflows of 7, 8, 9, and 12 MGD.
The results of this analysis indicate that this section of the Cape Fear
River is at its assimilative capacity during low flow conditions. As
expected, a relatively small increase of wasteflow results in a correspond-
ing decrease of allowable BOD loading. The model predicts the long, drawn
out DO sag to respond very sensitively to slight changes of the BOD and DO
concentrations in the effluent. The effluent limitations for oxygen consum-
ing wastes, in turn, depend on the effluent DO concentration. As shown in
the attached table, a 1 mg/1 increase in effluent DO results in a 1 mg/1
increase in allowable BOD5.
The NH3-N limit was maintained at 1.0 mg/1 because that is the current
limit for the facility and it was assumed that there is no need or desire to
increase it. The two sets of effluent limits for each flow are equivalent;
final limits will be specified when a wasteload allocation request is com-
pleted. I hope these values are helpful in the planning and design of the
Rockfish Creek WWTP, but it is very important for the Fayetteville Public
Works Commission to realize that these are only speculative limits. An
application for permit modification must be received before any limits can
be finalized.
Please contact me if you have any questions or if I can be of any fur-
ther assistance.
cc:

Speculative Effluent Limits for the Rockfish Creek WWTP
Flow BOD5 NH3-N DO
(MGD) (mct/l) (mg/1) (mg/1)
6 15 1 5 (Existing)
7 • 10 1 5
7 11 1 6
8 8 1 5.
8 9 1 6
9 7 1 5
9 8 1 6
12 5 1 5
12 6 1 6