NC0023892_Wasteload Allocation_19950220

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCO023892
P1:RMlTTEE NAME: City of Salisbury
FACILITY NAME: Town Creek Wastewater Treatment Plant
Facility Status: Existing
Permit Status: Modification
Major Minor _
Pipe No.: 001
Design Capacity: 5.0 MGD
Domestic (% of Flow): 64 %
Industrial (% of Flow): 36 %
Comments:
Two waste loads are needed: - G `t �I-
1. 5.0 MGD Town Creek into Town Creek l�
2. 5.0 MGD To WWTP into the Yadkin River
t_
RECEIVING STREAM: Yadkin River
Class: q� WS - \1
Sub -Basin: 03-07-04
Reference USGS Quad: E 17NW
County: Rowan
Regional Office: Mooresville Regional Office
Previous Exp. Date: 7/31/98
(please attach)
Treatment Plant Class: IV
Classification changes within three miles:
Requested by: Jay Lucas Date: H94
Prepared by: Date: i
Reviewed by: ate: a�aU
Modeler
7-
Date Rec.
#
MMv1
9/6-
Drainage Area (mil
Avg. Streamflow (cfs):
7QI0 (cfs) Winter 7Q10 (cfs) 30Q2 (cfs)
Toxicity Limits: IWC �� %� Acu �ChroiP�'
Instream Monitoring:
Parameters
Upstream Location IQ Y h i
Downstream Location CY6-hm5
Effluent
Characteristics
Summer
r
inter
BOD5 (mg/1)
oX
NH3-N (mg/1)
�?
D.O. (mg/1)
5
TSS (mg/1)
F. Col. (/100 ml)
pH (SU)
I -
effective l years
Recommended Limit after permit issued
Town Creek Town Creek Yadkin River
n.,a_ ..,ter wn nr m . Mi1v max WO or EL Daily max WO or EL
Flow (MGD)
Cadmium (ug/1):
Chromium (ug/1):
Copper (ug1l):
Nickel (ug/1):
Lead (ug/1):
Zinc (ag/l):
C( Cyanide (ug/1):
Fluoride (mg/1):
Mercury (ug/1):
**Yadkin River Limits bas on ution o : at eac ow u .
* Limits for Cd and Cn will become effective 2 years after permit issue date at the Town
Creek site. ftni h- ,I, ►sr Z years .
F,

FACT SHEET FOR WASTELOAD ALLOCATION
Request # 8167 N.C. DR I`. of
Facility Name:
City of Salisbury Town Creek WWTP ENVMZONMENT, HEALTH,
NPDES No.:
NCO023892
& NATURAL RESOURCES
Type of Waste:
64% Domestic 36% Industrial
Facility Status:
RELOCATION
JAN 27 1995
Permit Status:
Renewal
Receiving Stream:
Yadkin River
DIVISION OF ENVIRONMENTAL MANAGEMENT
Classification:
WS-V
03-07-04
MOQRESYiLLE REGIONAL OFFICESubbasin:
County:
Rowan
Stream Characteristic:
Regional Office:
Mooresville
USGS #
Requestor:
Date of Request:
Jay Lucas
1.0Ff8j9-4 1212-7/g4
Date: l l/l/94
Drainage Area (mi2):
Topo Quad:
E17NW
Summer 7Q10 (cfs): 69.75*
Winter 7Q10 (cfs):
Average Flow (cfs):
)10%
IWC (%)
nbe,7Q10 =69.75 cfs for 5.0 MGD in the Yadkin River. The 7Q10 value was back calculated using the
dilution from the diffuser.please address questions concerning this
matter to Betsy Johnson.
Wasteload Allocation Summary
Background info: Town Creek above WWTP is rated Fair and Town Creek below WWTP (I-85)
rated Poor (9/90). this survey was conducted to assess the impacts of Salisbury WWTP effleunt to the biota
of Town Creek as part of a statewide investigation of chronic dischargers. The upstream site is stressed by
both urban runoff and low flow. This discharge had a severe effect on stream biota, elminating even the
relatively tolerant EPT species that were found at the upstream location. Facility plans to combine outfall
with Salisbury Grants Creek WWTP and relocate discharge to the Yadkin River. Upon completion of a
nutrient management plan for High ock Lake, nutrient limits may be required. Recommend existing
conventional limits and new toxicant imits based on 7Q10= 69.75 cfs. Cd and Cn limits for the Town Creek
outfall should apply 2 years after perm t issue date.
o 4 U, t'M.
Special Schedule Requirements and additional comments from Reviewers:
4tif � Tl�L cr ry ,B579;i(J N077ri e�Z> TAfG- Y W1 t-- — A) 4
/^,�s Ted M i7AIW cec4-C�77 o ti! AGr A4FtoGrr77o*/ � —z��
Prepared by:
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineerin
RETURN TO TECHNICAL SERVICES BY:
rED c 6 177J

CONVENTIONAL PARAMETERS
Existing Limits:
Town Creek
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (µg/1):
Oil & 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 nil):
pH (SU):
Residual Chlorine (µg/1):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Monthly Average
Summer Winter
5
5
10
20
3
6
5
5
30
30
200
200
6-9
6-9
monitor
monitor
monitor
monitor
monitor
monitor
Town Creek Yadkin River
Monthly Average Monthly Average
Summer Winter Summer Winter
5
5
5
5
10
20
10 J
20
3
6
3
6
5
5
5
5
30
30
30
--
To
200
200
200 -
200
6-9
6-9
6-9
6-9
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
monitor
A nutrient management plan for High Rock Lake is currently being developed
which may require nutrient controls at this facility.

TOXICS/METALS
Type of Toxicity Test: Chronic, quarterly (Ceriodaphnia) P/F
Existing Limit: P/F at 85%
Recommended Limit: 10% (Yadkin River for 5 mgd)
85% (Town Creek for 5 mgd)
Monitoring Schedule: Mar, Jun, Sep, Dec
Existing Limits Until 2/28/95 Start 3/l/95
Town Creek Town Creek
Daily max WQ or EL Daily max WQ or EL
Flow (MGD)
Cadmium (ug/1):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/1):
Lead (ug/1):
Zinc (ug/1):
Cyanide (ug/1):
Fluoride (mg/1):
Mercury (ug/1):
5
5
monitor
2.4
59
WQ
59
WQ
monitor
monitor
104
104
30
WQ
30
WQ
monitor
monitor
monitor
5.9
monitor
monitor
monitor
monitor
effective Iyears
Recommended Limit after permit issued
Town. Creek Town Creek Yadkin River
Daily max WQ or EL Daily max WQ or EL Daily max WQ or EL
Flow (MGD)
Cadmium (ug/1):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/1):
Lead (ug/1):
Zinc (ug/1):
Cyanide (ug/1):
Fluoride (mg/1):
Mercury (ug/1):
5
5
5
monitor
2.4
WQ
20
WQ
59
WQ
59
WQ
LTMP
monitor
monitor
monitor
104
WQ
104
WQ
LTMP
30
WQ
30
WQ
LTMP
monitor
monitor
monitor
monitor
5.9
WQ
50
monitor
monitor
monitor
monitor
monitor
LTMP
**Yadkin River Limits based on dilution of 10:1 at each flow due to diffuser.
* Limits for Cd and Cn will become effective 2 years after permit issue date at the Town
Creek site. ftni �*►- 0n1 y 1"" Z VarS .
Toxics were reevaluated based on observed DMR data and new EPA methods.
Limits required for cadmium and cyanide are based on observed and predicted exceedances
of the water quality allowable levels. Chromium, nickel, lead, and mercury will be
monitored through the long-term monitoring plan. Fluoride is not included in the LTMP;
therefore, it should be monitored in the NPDES permit. The observed and predicted values
are lower than the allowable levels. Monthly monitoring is recommended for copper, zinc,
and cyanide due to high levels observed in the effluent.
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.

INSTREAM MONITORING REQUIREMENTS
Town Creek discharge
Upstream Location: at least 100 ferret upstream from outfall
Downstream Location: off of Bridge at SR 2168
Parameters: BOW, NW, Temp, DO, Fecal, Cond, pH
Special instream monitoring locations or monitoring frequencies:
1) Monitor above POCs 3/week Apr 1- Oct 31 and 1/week Nov 1 - Mar 31
2) Additional POCs to monitor at downstream site Jun 1 - Sep 30 (1/wk), TP,
PO4, TKN, NH3N, NO2+NO3, VAk- A
Yadkin River
Discharge
Upstream Location: 200 ft upstream from diffuser outfall in the Yadkin River
Downstream Location: Yadkin River at the Town of Yadkin or I
0.7 miles upstream of railroad bridge (see a #ad'4
Parameters: Temp, DO, Fecal, Cond, Turbidity
Special instream monitoring locations or monitoring frequencies
at downstream site: Jun -Sep (1/wk), TP, PO4, TKN, NH3N, NOx , t4i-t►'
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) Y_ (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 1) If yes, explain with
attachments.

Facility Name w e Q Permit # 00023 gqZ Pipe # 001
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 '�< 6 % (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
quarLerjy 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
ren 1 ;h1N , SBP , DEC . 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 1,4 cfs
Permitted Flow 5 MGD
IWC 215 %
Basin & Sub -basin Y#b 036f04
Receiving Stream Town Creek
County koVJoin
Recommended .
,� ze
Date I —
QCL P/F Version 9191

Facility Name i Permit # N C QQ2_3 9 9 Z Pipe # 00
reIccahor► 6 Ykd Ici'n k1or
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 Ceriodanhnia 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 -W—% (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
rnA R . 3uN . SEP, DEC . Effluent sampling for this testing shall be performed at the NPDES
pern tted 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 67.75 cfs
Permitted Flow 5 MGD
1WC /O %
Basin & Sub -basin YAO 03670¢�
Receiving Stream �Dx/ N 2, d ev�
County Q n v'1an
Recommended%/jbby:
.[-��.tG iil/l I
Date 20 S
QCL P/F Version 9191

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Toxics Spreadsheet � �C ► .1 �,'
er
p 5 #7 0 Y
number samples
47
12
12
47
47
22
11
max
9
39.6
31.4
5
40
12
-330^
standard
25
7
50
50
88
5
2
ob cu zn cr
6.41 2.16 66.02
n i CN c d Col^/"
std dev
1.75
8.88
8.66
0.65
)q L- H-L a i„
Max. Pred. 1 18.9 1 79.2 59.66 1 8.1 1 67.2 1 Ik.2-1 4393
Allowable 250.0 1 70.0 1 500.0 1 500.0 1 880.0 1 50.0 120.0
Weekly average
1 /2 FAV
Dilution * 1/2FAV
4 ' weekly average
Daily Maximum
ob cu zn cr ni CN cd
29.516 8.2645 59.032 59.0323 103.9 5.9032 2.3613
33.8 na na 984.3 789 22 5
338 ##### ##### 9843 7890 220 50
118.06 33.058 236.13 236.129 1415.59 23.613 9.4452
118.1 ##### ##### 236.129 415.6 23.61 9.445
DMR data only
Weekly average
1 /2 FAV
Dilution * 1/2FAV
4 ' weekly average
Daily Maximum
ob cu zn cr ni CN cd
29.516 8.2645 59.032 59.0323 103.9 5.9032 2.3613
33.8 na na 984.3 789 22 5
338 ##### ##### 9843 7890 220 50
118.06 33.058 236.13 236.129 1415.59 23.613 9.4452
118.1 ##### ##### 236.129 415.6 23.61 9.445
DMR data only
118.1 ##### ##### 236.129 415.6 23.61 9.445
DMR data only

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SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit
Water Quality Section
Attention: Jay Lucas
Date: December 13, 1994
AUTHORIZATION TO CONSTRUCT''��'
NPDES PERMIT
REPORT AND RECOMMENDATIONS
County: Rowan
MRO No.: 94-234 ;
Permit No. NCO023892
PART I - GENERAL INFORMATION
1. Facility and Address: Town Creek WWTP
City of Salisbury
Post Office Box 479
Salisbury, N.C. 28145
2. Date of On -Site Investigation (if conducted): August 6,
1992.
3. Report Prepared By: Michael L. Parker, Environ. Engr. II
4. Persons Contacted and Telephone Number: N/A
5. verified Discharge Point(s), List for All Discharge Points:
Latitude: 35' 41' 03" Longitude: 80' 24' 32"
Attach a USGS map extract and indicate treatment facility
site and discharge point on map. Ensure discharge point(s)
correspond to'NPDES permitted discharge points.
USGS Quad No.: E 17 NW
6. Site size and expansion area consistent with application?
Yes.
7. Topography (relationship to flood plain included): The site
is at or near flood plain elevation. Protection from
flooding should be provided for any proposed WWT facilities..
S., Location of Nearest Dwelling: None within 500 feet of the
WWTP site..
.0100.

I
Page Two
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Existing Treatment Facility
a. Current permitted capacity: 5.0 MGD.
b. Date(s) and construction activities allowed by previous
ATCs issued in the previous two (2) years: N/A.
C. Actual treatment capacity of the current facility
(design volume): 5.CrMGD.
d. Description of existing or substantially constructed
WWT facilities: dual bar screens followed by a primary
clarifier, dual aeration basins, dual trickling
filters, dual secondary clarifiers, dual aerobic
digesters, a chlorine contact chamber and sludge
dewatering facilities. '
2. Type of Proposed Treatment Facility: The applicant proposes
to construct 1,700 linear feet of interceptor sewer along
with new mechanical bar screens and grit/scum removal
facilities.
3. Residuals Handling and Utilization/Disposal Scheme:
a. If land.applied, please specify DEM Permit No.
WQ0001956.
Residuals Contractor: AMSCO, Inc.
Telephone No. [phone].
b. Residuals Stabilization: PSRP
4. 'Treatment Plant Classification (attached completed rating
sheet): Class IV
5. SIC Code(s): 4952
Wastewater Code(s):
Primary: 01
Secondary: 81, 55, 58
Main Treatment Unit Code: 01003
6. Important SOC/JOC or Compliance Schedule Dates: N/A

Page Three
PART III - EVALUATION AND RECOMMENDATIONS
The City of Salisbury requests issuance of an ATC for the
construction of 1,700 feet of interceptor sewer and new
mechanical bar screens and grit/scum removal at the Town Creek
WWTP. These facilities are part of the eventual conversion of the
Town Creek WWTP to,a pump station when the City has completed
construction of a new WWTP designed to eliminate both the Town
Creek and Grant Creek WWTPs.
Pending a technical review and approval,of the plans and
specifications by P&E;; it is recommended that an ATC be issued.
Signature of Report Preparer
Water Quality Regi
1 Supervisor
/z -i3 -9
Date
Dat
11`