NC0025721_Wasteload Allocation_19920921

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NC0025721
Weldon WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Report
Speculative Limits
Instream Assessment
(67b)
Environmental
Assessment (EA)
Permit
History
Document Date:
September 21, 1992
■► This document is printed on reuse paper - ignore any
content on the reYernse *aide

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0025721
PERMITTEE NAME: Town of Weldon
FACILITY NAME: Town of Weldon WWTP
Facility Status: Existing
Permit Status: Renewal
Major
Pipe No.: 001
Minor
Design Capacity: 1.2 MGD
Domestic (% of Flow): 58.3 %
Industrial (% of Flow): 41.7 %
Comments:
pretreatment comments attached. % based on 1.2 MGD total, .5 MGD
industrial (cooling water)
RECEIVING STREAM: the Roanoke River
Class: C
Sub -Basin: 03-02-08
Reference USGS Quad: B 28 NE
(please attach)
County: Halifax
Regional Office: Raleigh Regional Office
Previous Exp. Date: 5/31/92 Treatment Plant Class: Class III
Classification changes within three miles:
none
Requested by: Randy Kepler 2
Prepared by: ,ti,c4 GtC�,rx..,
Ty
Reviewed by: (�
"Bob, 135 s1✓J) ( Pc) ; 120(s(0 (0)
Date: 7/7/92
Date: • q Z
Date: cl 11 a
c -J
gal)
Modeler
Date Rec.
#
kJ a
rtk az
lotq
Drainag m i2) g(o©o Avg. Streamflow (cfs): 6aco
7Q10 (cfs) 5-0 Winter 7Q10 (cfs) too0 30Q2 (cfs)
Toxicity Limits: IWC % Acut Chronic
Instream Monitoring: P/F AT 90 "'
Parameters
Upstream Location
Downstream Location
[ . Z AA
Effluent
Characteristics
s4cMlw„d
sun //witJ
BOD5 (mg/1)
30 /3 o
l 5115
NH -N (mg/1)
3
ittoN/Mo/4
MoN /MD N
D.O. (mg/1)
TSS (mg/1)
3o fyo
0 /30
F. Col. (/100 ml)
Mc14Imon)
IU.eN /MaJ
pH (SU)
6-1
6 - 4
LA> c uadL) :
Ato Nrror2-
,gaNC c(ig.le, :
MJNi ioR-.
.. •
a.
Comments: Liners mow 66, it 9r12LN4&'r u?vN IUSin;-w�i

RECEWED
AUG 2 71992
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 Elie.p9W,T41,Lace ALLOCATION
Request # 7019
Weldon WWTP
NC0025721
100% dom (at 0.6 MGD), 58% dom/42% ind (at 1.2 MGD)
Exis ing
Ren wal
Roo :oke River
C
030208
Halifax
RRO
R. Kepler
7/7/92
B28NE
Stream Characteristic:
USGS #
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
8600
1500
1000
6000
0.19 (at 1.2 MGD)
.-,
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
This renewal will consist of existing 0.6 MGD and 1.2 MGD expansion.
1.2 MGD wasteflow. The facility is to tie-in a cogeneration facility with
is developing a pretreatment program (to apply with 1.2 MGD expansion
The facility has had 2 violations of TSS and was under an SOC in the pa
LtMuT5 Atkf SE PADI24 Srwnt4&Jr upeN SkStN- WIDE tZE-NEW4E..
An A to C exists for the
their expansion. Weldon
), :.
st.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by:
Reviewed by
Instream Assessment:
Regional Supervisor:
Permits & Engineering:
>ga,ucftA9olv,
Date: $ f 2 I /92-
Date:
Date:
Date: V4 Z
RETURN TO TECHNICAL SERVICES BY: .SEP 2 4 1992

2
CONVENTIONAL PARAMETERS
Existing Limits:
Monthly Average Monthly Average
Summer Winter Summer Winter
Wasteflow (MGD): 0.6 0.6 1.2 1.2
BOD5 (mg/1): 30 30 15 15
NH3N (mg/1): monitor monitor monitor monitor
DO (mg/1):
TSS (mg/1): 30 30 30 30
Fecal Col. (/100 ml): monitor monitor monitor monitor
pH (SU): 6-9 6-9 6-9 6-9
Residual Chlorine (µg/1):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Recommended Limits:
Monthly Average Monthly Average
Summer Winter WQ or EL Summer Winter
Wasteflow (MGD): 0.6 0.6 1.2 1.2
BOD5 (mg/1): 30 30 15 15
NH3N (mg/1): monitor monitor monitor monitor
DO (mg/1):
TSS (mg/1): 30 30 30 30
Fecal Col. (/100 ml): monitor monitor monitor monitor
pH (SU): 6-9 6-9 6-9 6-9
Residual Chlorine (µg/1):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
NO CHANGES from previous permit (with regard to domestic -type limits)
Limits Changes Due To: Parameter() Affected
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data
New regulations/standards/procedures
New facility information
(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
COD (mg/):
Cadmium (ug/1):
Chromium (ug/1):
Copper (ug/1):
Nickel (ug/1):
Lead (ug/l):
Zinc (ug/1):
Cyanide (ug/l):
Phenols (ug/1):
Mercury (ug/1):
Silver (ug/1):
Recommended Limits
COD (mg/):
Cadmium (ug/l):
Chromium (ug/l):
Copper (ug/1):
Nickel (ug/l):
Lead (ug/1):
Zinc (ug/1):
Cyanide (ug/1):
Phenols (ug/1):
Mercury (ug/1):
Silver (ug/l):
Limits Changes Due To:
Change in 7Q10 data
Change in stiream classification
Relocation of discharge
Change in wasteflow
New pretreatment information ✓
Failing toxicity test
Other (onsite toxicity study, interaction, etc.)
TOXICS/METALS
Acute P/F
Acute P/F at 90% (at 1.2 MGD)
Jan, Apr, Jul, Oct
Daily Max.
At 1.2 MGD
Daily Max. WQ or EL
Mohr.-iblf
monitor
Parameter(s) Affected
1ear1 ntottii vt rec -ui kcc( 4v al`
n * ?Ai +ila u1 kv2 -td vv•¢v ?ro te&t.Yuj
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:
Downstream Location:
Parameters: N/A
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.

•1
Facility Name IP et. you V\I W ry Permit # NCOo 2572.I Pipe #
ACUTE TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North Carolina
Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A Single Effluent
Concentration." The monitoring shall be performed as a Fathead Minnow (Pimephales promelas) 24 hour static
test, using effluent collected as a 24 hour composite. The effluent concentration at which there may be at no time
significant acute mortality is 90% (defined as treatment two in the North Carolina procedure document). Effluent
samples for self -monitoring purposes must be obtained during representative effluent discharge below all waste
treatment. The first test will be performed after thirty days from the effective date of this permit during the
months of Ant , Ai" , ru Oct'
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 TGE6C.
Additionally, DEM Form AT-2 (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 either these monitoring requirements 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.
TOR Lot). eR VON sut M &ta.
7Q10 Woo cfs
Permitted Flow 1.2 MGD
IWC o•11 %
Basin & Sub -basin o 3o208
Receiving Stream Re a Ri t-
County .LAL.l MVP Date g/2 i/q2✓
Recommended by:
Aestd.a.yt. LJ6
QAL PIF Fathead 24 Version 9/91

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08/22/J2 ver 3.1 TOXICS REVIEW
Facility: weldon
NPDES Permit No.: nc0025721
Status (E, P, or M): e
Permitted Flow: 1.2 mgd
Actual Average Flow: 0.2 mgd
Subbasin: '030208
Receiving Stream: roanoke river I PRETREATMENT DATA I----EFLLUENT DATA---- I
Stream Classification: c I ACTUAL PERMITTEDI I
7Q10: 1,000.0 cfs I Ind. + Ind. + 1 FREQUENCY I
IWC: 0.19 % I Domestic PERMITTED Domestic 1 OBSERVED of Chronic)
Stn'd / Bkg 1 Removal Domestic Act.Ind. Total Industrial Total 1 Eflluent Criteria I
Pollutant AL Conc. 1 Eff. Load Load Load Load Load 1 Conc. Violations)
(ug/i) (ug/1) 1 % (#/d) (#/d) (#/d) (#/d) (#/d) 1 (ug/i) (#vio/#sam)I
Cadmium S 2.0 1 92% 0.0100 0.0000 0.0100 1 I
Chromium S 50.0 1 76% 0.1900 0.0000 0.1900 0.6670 0.857 1 1 I
Copper AL 7.0 1 82% 0.2300 0.0000 0.2300 1 1 N
Nickel S 88.0 1 32% 0.1500 0.0000 0.1500 1 1 P
Lead S 25.0 1 81% 0.1800 0.0000 0.1800 1 1 U
Zinc AL 50.0 1 77% 0.6600 0.0000 0.6600 3.3360 3.996 1 1 T
Cyanide S 5.0 1 59% 0.1500 0.0000 0.1500 1 I
Mercury S 0.012 1 99% 0.0000 0.0000 0.0000 1 1 S
Silver AL 0.06 1 94% 0.0200 0.0000 0.0200 1 1 E
Selenium S 5.00 1 50% 0.0080 0.0000 0.0080 1 1 C
Arsenic S 50.00 1 40% 0.0100 0.0000 0.0100 1 1 T
Phenols S NA 1 0% 1 1 I
NH3-N C 1 0% 1 1 0
T.R.Chlor.AL 17.0 1 0% 1 1 N
.9 1 1 I
Pollutant
ALLOWABLE PRDCT'D PRDCT'D PRDCT'D MONITOR/LIMIT I--ADTN'L RECMMDTN'S--
Effluent Effluent Effluent Instream 1 Recomm'd
Conc. using using Conc. Based on Based on Based on 1 FREQUENCY INSTREAM
Allowable CHRONIC ACTUAL PERMIT using ACTUAL PERMITTED OBSERVED 1 Eff. Mon. Monitor.
Load Criteria Influent Influent OBSERVED Influent Influent Effluent 1 based on Recomm'd ?
(#/d) (ug/1) (ug/1) (ug/l) (ug/1) Loading Loading Data 1 OBSERVED (YES/NO)
Cadmium S 134.82 1077.269 0.437 0.000 0.00
Chromium S 1,123.48 26931.720 24.917 112.390 0.00
Copper AL 209.72 3770.441 22.622 0.000 0.00
Nickel S 697.88 47399.828 55.736 0.000 0.00
Lead S 709.57 13465.860 18.688 0.000 0.00
Zinc AL 1,172.33 26931.720 82.948 502.213 0.00
Cyanide S 65.76 2693.172 33.605 0.000 0.00 Monitor
Mercury S 6.47 6.464 0.000 0.000 0.00
Silver AL 5.39 32.318 0.656 0.000 0.00 Monitor
Selenium S 53.93 2693.172 2.186 0.000 0.00
Arsenic S 449.39 26931.720 3.279 0.000 0.00
Phenols S 0.000 0.000 0.000 0.00
NH3-N C 0.000 0.00
T.R.Chlor.AL 9156.785 0.00
Monitor -
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NPDES PREl'RFATMENT INFORMATION REQUEST FORM
FACILITY NAME : L. L CC)\v (3 WI? 1 �,�,cu c NPDES NO. NCO 0 2. 5 7
Z j
REQUESTER : w oy L E R DATE : 3 / 21 / REGION:
LE G�
PERMIT CONDITIONS COVERING PRETREATMENT
This facility has no SIUs and should not have pretreatment language.
This facility should and/or is developing a am
Please include the following conditions:
g pretreatment program.
Program Development
Phase I due ..1./.1/9 2
Phase II due C/ t / 24-
_ Additional Conditions
(attached)
This facility is currently implementing a pretreatmentprogram.
Please include the follow' s: p
following conditions.
Program Implementation
Additional Conditions
(attached)
IGNIFICANT INDUSTRIAL USERS' (SIUs) cxJN'IRIBUTIONS
SIU FLOW - TOTAL:
RCEV EaomposmoN:
MAR 2 7 1992
TECHNICAL SUPPORT BRANCH
TEXTILE:
METAL FINISHING:
OTHER:
MD
MGD
MD
MD
MD
MGD
IiEAL7WORKS REVIEW
PARAME'TER
Cd
Cr
Cu
Ni
Pb
Zn
CN
Phenol
Other
PASS
THROUGH DAILY LOAD IN LBS/DAY ACTUAL
;ALLOWABLE DOMESTIC PERMI'1..= INDUSTRI % REMOVAL
AkOT =
//
v1Vi1I7z:
REIN: c/o2/ /q02_ REVIEWED AY:
RETUNED: 6/6/c ,
eto
44446,24
let pre,
LCAVe
Pic l5�
IT)
W(LL
-TIME
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NPDES PRETREATMENT INFORMATION REQUEST FORM
FACILITY NAME: %D!d!�/ o/c /vc74r/
REQUESTER: /`D_fa `l f e 3ar0'7
NPDES NO. NCO() % /
DATE: 9 //3 / 7/ RDGION: /ems j 4
PERMIT CONDITIONS COVERING PRETREATMENT
facility has no SIUs and should not have pretreatment language.
This facility should and/or is ing ro
a pretreatment pgram.
Please include the followingdconditions:
Program Development
Phase I due /_/_
Phase II due —/—/—
Additional Conditions
(attached)
This facility is currently implementing a pretreatment program.
Please include the following conditions:
Program Implementation
Additional Conditions
(attached)
SIGNIFICANT INDUSTRIAL USERS' (SIUs) CONTRIBUTIONS
SIU FLOW - TOTAL:
-COMPOSITION:
TEXTILE:
METAL FINISHING:
OTBER: b .
O. #00 mop
msD
MGD
ND
MGD
HEADWORKS REVIEW
PARAMETER
Cd
Cr
Cu
Ni
Pb
Zn
CN
Phenol
Other u
RECEIVED:
PASS
'THROUGH
DAILY LOAD IN LBS/DAY ACTUAL
DOMESTIC YEiMt'rri INDUSTRIAL % REMOVAL
p. ra
0.23
REVIEW D BY:
9,02
3- vit
77
fK
cf q4<
ce) *t clA
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.t r tic.
ejaiS nt tra". : /t / /Q'

4
0'3,0 z _O V
To: Permits and Engineering Unit
Water Quality Section
DATE: April 9, 1992
REC Li V LQ DES STAFF REPORT AND RECODmIENDATI0N8
APR 2 0 1992 COUNTY: Halifax
TECHNICAL SUPPORTBRArICH PERMIT NUMBER: Nc0025721
PART I - GENERAL INFORMATION
1. Facility and Address: Town of Weldon WWTP
P.O. Box 551
Weldon, North Carolina 27890
2. Date of Investigation: March 26, 1992
3. Report Prepared by: Judy Garrett, Environmental Chemist
4. Person Contacted & Telephone Number: Brian Williams [phone]
5. Directions to Site: U.S. 158 East from Roanoke Rapids through
Weldon. Go to intersection of U.S. 301. Road to WWTP is directly
across U.S.301 from intersection with 158. WWTP is approximately .8
miles at end of (dirt) road.
6. Location of Discharge Point (see attached USGS snap extract with
discharge point indicated).
a. USGS Quad Number:B28NE USGS Quad Name: Weldon, N.C.
b. Latitude: 36°25'27" Longitude: 77°34'40"
7. Size (land available for expansion and upgrading):
Approximately 6 acres. There is sufficient land available for
upgrading the plant to 1.2 mgd. Site has already been graded for
placement of additional oxidation ditch and clarifier.
8. Topography (including relationship to 100-year flood plain):
Generally flat with little slope. Site appears to be above 100-year
flood plain. The river is approximately 20 feet below the plant.
9. Location of Nearest Dwelling: >1000 feet
10. Description of Receiving Stream or Affected Surface Waters.
a. Name: Roanoke River
b. Classification: C

c. River Basin and Subbasin Number: 03-02-08
d. Receiving Stream Features and Pertinent Downstream Uses:
Large River with no known downstream uses until Jamesville
which is at least 70 miles downstream.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Description of Wastewater.
a. Type of Wastewater:
Existing 0.6 mgd facility: 100 % Domestic
0 % Industrial
Proposed 1.2 mgd facility: 58.3_ % Domestic
41.7 % Industrial
b. Volume of Wastewater (design capacity):
Existing: 0.6_ MGD
Proposed: _1.2_ MGD
c. Types and Quantities of Industrial Wastewater:
500,000 gpd made up of cooling tower blowdown, sump and sanitary
waste and coal pile runoff, from a cogeneration facility, .
d. Prevalent Toxic Constituents in Industrial Wastewater:
Lead, Chromium, Zinc, Cadmium, Copper, and Selenium. Cooling
water may contain biocides- Industry should be required by Town
to fill out biocide sheet. Coal pile runoff may contain toxic
organics. Industry should be required by Town to sample priority
pollutants.
2. Pretreatment Program Status: X In Development
Approved
Should Be Required
Not Needed
The dates for Phase I and Phase II submittals should be as in
current NPDES Permit.
3. Description of Industrial Processes and Applicable 40 CFR Parts
and Subparts: N/A
4. Industrial Production Rates (in appropriate mass/day units).
N/A
a. Long Term Average Production Rate:
b. Highest Monthly Production in Past 12 Months:
c. Highest Yearly Production in Past 5 Years:

5. Treatment System Information.
a.. Status of Treatment System: X Existing 0.60 mgd
X Proposed 1.20 mgd
b. Description of Treatment System:
Existing facilities: 0.6 mgd WWTP consisting of barscreen,
communutor, influent pumps, oxidation ditch, secondary clarifier,
aerobic digester, aerated sludge holding basin, parshall flume
with continuous recording flow meter, chlorinator, chlorine
contact chamber, and sludge drying beds.
Proposed facilities: 1.2 mgd facility will include addition of
one oxidation ditch and one final clarifier to existing
facilities.
6. Residual Solids Treatment and Disposal Method: Aerobic digester
and 10,000 gallon aerated sludge holding basin with land
application under Permit No. WQ0002368 held by Town of Weldon.
Sand drying beds are also available.
7. Treatment System Classification (rating sheet attached, if
appropriate): Existing facility: Class III. Proposed facility:
Class III.
8. Codes.
a. SIC Code: 4952
b. Wastewater Code: 01
c. MTU Code: 10003
9. Treatment System Compliance Status: The upgraded 0.6 mgd
facility is currently in compliance with the final effluent
limitations.
PART III - OTHER PERTINENT INFORMATION
1. Is This Facility Being Constructed With Construction Grants
Funds? yes
2. Special Monitoring Requests: 1.2 mgd facility- metal as required
by wasteload. Daily Residual Chlorine requirements should be
included since the WWTP has chlorination facilities.
3. Additional Effluent Limits Requests: Fecal coliform due to
grant -funded chlorination facilities and accessibility of
discharge to the public.
4. Other:

1
4
PART IV - EVALUATION AND RECOMMENDATIONS
It is recommended that the subject NPDES Permit be reissued to the
Town of Weldon with effluent pages for 0.6 and 1.2 mgd flows for a
period in accordance with the basin -wide permitting plan if no
significant adverse public comment is received. Monitoring should be
in accordance with regulatory requirements for a Class III facility
with an effluent limited discharge.
TD:JG:jg
9-
Report Writer
R
(/_)° qions 1 Water duality Supervisor
April 9, 1992
Date