NC0021369_Permit Issuance_19981026

NPDES DOCUHENT SCANNING COVER SHEET
Permit:
NC0021369
Columbus WWTP
NPDES
Document
Type:
Permit Issuance )
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
October 26, 1998
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State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. David Lane
Town of Columbus
P.O.Box 146
Columbus, North Carolina 28722
Dear Mr. Lane:
vt;47c1rA
,,21F/E•
NCDENR
October 26, 1998
Subject: NPDES Permit Issuance
Permit No. NC0021369
Town of Columbus WWTP
Polk County
In accordance with the application for a discharge permit received on April 8, 1998, the
Division is forwarding herewith the subject state - NPDES permit. This permit is issued pursuant
to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of
Agreement between North Carolina and the U.S. Environmental Protection Agency dated
December 6, 1983.
Please note the following changes incorporated into this NPDES permit:
• The WWTP was re -rated from a Class III to a Class II facility, therefore monitoring
frequencies were adjusted for a Class II ranking.
• Effluent limits and monitoring requirements for chromium and nickel were deleted from
the permit.
• Effluent limits for lead, cyanide, and mercury were removed from the permit, and the
monitoring frequency was changed from weekly to monthly.
• Monitoring frequency for copper and zinc was changed from 2/month to monthly.
• The permit expiration date was changed from November 30, 1998 to July 31, 2003.
If any parts, measurement frequencies or sampling requirements contained in this permit
are unacceptable to you, you have the right to an adjudicatory hearing upon written request
within thirty (30) days following receipt of this letter. This request must be in the form of a
written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed
with the office of Administrative Hearings, Post Office Drawer 27447, Raleigh, North Carolina
27611-7447. Unless such a demand is made, this permit shall be final and binding.
Please take notice that this permit is not transferable. Part II, E.4. addresses the
requirements to be followed in case of change in ownership or control of this discharge.
This permit does not affect the legal requirements to obtain other permits which may be
required by the Division of Water Quality or permits required by the Division of Land Resources,
Coastal Area Management Act, or any other Federal or Local governmental permits may be
required. 1
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Page 2
Mr. David Lane
Town of Columbus
October 26, 1998
If you have any questions or need additional information, please contact Mr. Tom
Belnick, telephone number [phone], extension 543.
Sincerely,
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E.
cc: Central Files
U.S.EPA, Roosevelt Childress
NPDES Unit, Permit File
Asheville Regional Office, Water Quality
Point Source Compliance/Enforcement Unit
Aquatic Tox

Permit No. NC0021369
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards arid regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
Town of Columbus
is hereby authorized to discharge wastewater from a facility located at
Town of Columbus WWTP
Levi Road extension
Columbus, North Carolina
Polk County
to receiving :waters designated as an unnamed tributary to Whiteoak Creek in the Broad River
Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, II, III, and IV hereof.
This permit shall become effective December 1, 1998.
This permit and authorization to discharge shall expire at midnight on July 31, 2003.
Signed this day October 26, 1998.
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental -Management Commission

1 J
Permit No. NC0021369
SUPPLEMENT TO PERMIT COVER SHEET
Town of Columbus
is hereby authorized to:
1. Continue to operate the existing 0.80 MGD activated sludge wastewater treatment
facility with effluent disinfection located at the Town of Columbus WWTP, Levi Road
Extension, Columbus, Polk County (See Part IIIA of this permit), and
2. Discharge wastewater (via Outfall 001) from said treatment works at the location
specified on the attached map into an unnamed tributary to Whiteoak Creek, which is
classified C waters in the Broad River Basin.

in( .
i
O
Latitude: 351513
Longitude: 820956 N
USGS Quad #: F10SW
River Basin #: 030802 Broad
Receiving Stream: UT White Oak Cr
Stream Class: C
Town of Columbus
WWTP
NC 0021369
Polk County

A (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL
Permit No. NC0021369
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall serial number
001. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement.
Frequency
Sample
Type
Sample
Location1
Flow
0.80 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C 2
30.0 mg/I
45.0 mg/I
Weekly
Composite
E, I
Total Suspended Residue2
30.0 mg/I
45.0 mg/I
Weekly
Composite
E, I
NH3 as N
2/Month
Composite
E
Fecal Coliform (geometric mean)
200 / 100 ml
400 / 100 ml
Weekly
Grab
E
Total Residual Chlorine
2/Week
Grab
E
Temperature
Weekly
Grab
E
pH3
Weekly
Grab
E
Total Nitrogen (NO2 + NO3 + TKN)
2/Year
Composite
E
Total Phosphorus
2/Year
Composite
E
Cadmium
5.4 ug/I
2/Month
Composite
E
Lead
Monthly
Composite
E
Cyanide
Monthly
Grab
E
Mercury
Monthly
Composite
E
Copper
Monthly
Composite
E
Zinc
Monthly
Composite
E
Silver
Monthly
Composite
E
Chronic Toxicity4
Quarterly
Composite
E
Notes:
1. Sample locations: E - Effluent, I — Influent
2. The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal).
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. Chronic Toxicity.(Ceriodaphnia) P/F at 37%; September, December, March, and June; See Special Condition A(2).
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit No. NC0021369
SUPPLEMENT TO EFFLUENT LIIVIITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A (2). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in
the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised November
1995, or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or
significant mortality is 37.0% (defined as treatment two in the procedure document). The permit
holder shall perform quarterly monitoring using this procedure to establish compliance with the
permit condition. The tests will be performed during the months of March, June, September,
and December. 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, DWQ Form AT-1 (original) is to be sent to the following
address:
Attention: Environmental Sciences Branch
North Carolina Division of Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 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 there be no discharge of flow from the facility during a month in which toxicity
monitoring is required, the permittee will complete the information located at the top of the
aquatic toxicity (AT) testorm indicating the facility name, permit number, pipe number, county,
and the month/year of the report with the notation of "No Flow" in the comment area of the
form. The report shall be submitted to the Environmental Sciences Branch at the address cited
above.
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 j requirement will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required,
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 Water Quality indicate potential impacts to the receiving stream, this permit may be
re -opened and modified to include altemate'rnonitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival, minimum control organism reproduction, and appropriate
environmental controls, shall constitute an invalid test and will require immediate follow-up
testing to be completed no later than the last day of the month following the month of the initial
monitoring.

SEP-10 98 10:1S FROMI:TRYCN DAILY BULLETIN 828-859-5575
TO:919 733 9919 PAGE:01/01
PUBLIC NOTICE
STATE OF NORTI1 CAROLINA
EN VC ROM ENTAL
MANAGEMENT
COMM ISSION
POST OFFICE BOX 29535
RALEIGTI, NC 27626-0535
NOTIFICATION OF
INTEN'r'I'U ISSUE
A'I'ATE NPDES PERMIT
On the basis of thorough Sluff
review and application uIArticic 2l
of Chapter 143, General Statutes of
North Carolina, Public Law 92-500
and other lawful 5lundards and regu-
lations, the North Carolina Environ-
mental Management Commission
proposes to issue a permit to dis-
charge to the persons listed below
effective 10/26/98 and subject to
special conditions.
Persons wishing to CCmment upon
or object to the pmposcd determina-
tions are invited 1u submit same in
writing to the above address no later
than 10/09/98, All comments re-
ceived prior to that elate will be
considered in the formulation of'fi-
nal determinations regarding the:
proposed permit. A public meeting
may be held where the Director of
the Di vision ofEnvironmental Man-
agemenl finds a significant dcgrceof
public interest in the proposed per-
mit.
A copy of the draft permit is
available by writing; or calling the
Division of Environmental Manage-
ment, PO Box 2953 5, Raleigh, North
Carolina 27626-0535; (919) 733-
7015.
The application and other infor-
mation may be inspected at these
lacationsduringnorrnal office hours,
Copics of the information on file arc
available upon request and payment
of the costs a Preproduction. A it such
comments or requests regarding a
proposed permit should make refer-
ence to the NPDES permit number
listed below.
September 1, 1998
David A. Goodrich
A. Preston Howard lr.,
P.E., Director
Division of environmental
Management
Public notice of intent to issue a
State NPDES permit to the follow-
ing:
1. NPDES No, NC0021369.
Town of Columbus, PO Box 146,
Columbus, NC 28722 has applied
for permit renewal for a facility
located at Town of' Columbus
WWTP, ot1 NCSR 153., cast of
Colutbus, Polk County. The facil-
ity discharges 0.80 MGD of treated
domestic wastewater from one out -
fall into an unnamed tributary to
Whiteoak Creek, a Class C stream in
the Broad River Basin which has a
7Q 10 flow oft. 10 cfs. Some param-
eters are water quality limited. 'This
mayaffect future water-qual ity based
effluent limitations for additional
dischargers within this portion of
the watershed.
2. NPDES No. NC0004464.
Stonet:utter Milk Corporation, Dal-
las Street, Spinclulc, NC 28160 has
applied fix a permit renewal for a
tacihty Incatcd at the Mill Spring
'pinning Plant, NC Highway 108,
Mill Spring, Polk County. The facil-
itydisehurbus 0,015 MGD of treated
domestic w:islewalor from one out-
let' into the South Branch River, u
Class C stream in the Bread River
Basin which has a 7Q 10 flow of0,_ti5
cis. For some parameters, the avail-
able load capacity of the immediate
receiving water will be consumed.
This inay affect future water quality
based effluent limitations for addi-
tional dischargers within this por-
tion id* the watershed.
;idv.9/ 1 1
Ix 13
FAX TO: KIM MURPHY AT 919-733-9919
This is Your
PROOF AD
From Tryon Daily Bulletin As Requested
Please Review Immediately!
Please proof for typos only. Text changes or ad
redesign may incura minimal graphic arts charge.
Thank you,
The Tryon Daily Bulletin
Phone: [phone] OR Fax: [phone]
❑ Faxed By:
CD
n`►
--0
CD
LEGALS - page 33

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0021369
Facility Information
Facility Name
Town of Columbus
Permitted Flow:
0.80 MGD _
Facility Class:
II (recentl reranke 1 from Ill to 11 by ARO) (-P 0 to . ' (7
,-,-! -
Facility/Permit Status:
(i.e. New, Modification,
Existing or Renewal)
Renewal 4 re rate- C -13 -'%5
County:
Polk
Stream Characteristics
Receiving Stream:
UT to Whiteoak Creek
Stream Classification:
C
Subbasin:
030802 (Broad River Basin)
Drainage Area (mi2):
4.5
Summer 7Q10 (cfs)
2.1 (use for permit renewal)
0.96 (updated USGS data; use for any future expansion)
Winter 7Q10 (cfs):
NA
30Q2 (cfs):
NA
Average Flow (cfs):
6.8
I WC (%):
37% (use 56% for any future expansion)
Miscellaneous
Regional Office:
Asheville
USGS 'Fopo Quad:
F 1 OS W
Changes Incorporated into Permit Renewal
Proposed Changes
Parameters Affected
Basis for change(s)
Change facility class from III
to II, and adjust monitoring
frequencies accordingly.
Toxicants (with limits) will
get 2/month sample —
frequency. Toxicants
(without limits) will get
monthly sample frequency. ,,
Toxicants. Monitoring
frequency for all other
parameters already reflects
Class II requirements
Facility recently re -rated by
ARO, per Staff report
submitted 5/18/98. Toxicant
monitoring requirements for
Class II facility based on
NPDES Supplemental
Monitoring Fact Sheet.
Remove from permit
(currently only a monthly
monitoring requirement)
Chromium
Detected in 1 of 28 samples
from 1996-97; reeonable
potential analysis (RPA) does
not indicate a toxicity
concern.
Remove from permit ✓
(currently an effluent limit
and weekly monitoring
requirement)
Nickel
Detected in 2 of 103 samples
from 1996-97; RPA does not
indicate a toxicity concern.

Remove effluent limit, and
change monitoring
requirement from weekly to
monthly V
Lead
Detected in 18 of 103 samples
from 1996-97; predicted max
eff conc. represents 93% of
allowable eff conc.
Remove effluent limit, and
change monitoring
requirement from weekly to
monthly L
Cyanide
Detected in 7 of 103 samples
from 1996-97; predicted max
eff conc represents 46% of
allowable eff conc.
Remove effluent limit, and
change monitoring
requirement from weekly to
monthly ,/
Mercury
Detected in 1 of 103 samples,
but detection limit exceeds
allowable eff.conc. RPA
indicates potential toxicity
concern due to detection limit.
Change monitoring
requirement from 2/month to
monthly
Copper, Zinc, Silver
RPA indicates potential
exceedance of action levels;
therefore retain monitoring
requirement but modify
monitoring frequency per
Supplemental
Monitoring Fact Sheet for
Class II Toxicants (w/o limits)
.�
6'1*er ioaS aJ/-zady elarjed
,. -f.-0,, D-�
PP, -tfl ,on'emy
on pea . 30 I y q 4 - -
�t•NPDES
See rev i sed ge+-r'�' •
NC0021369
Summary
Previously this minor municipal WWTP (0.8 MGD) received its majority of flow from a
single industry (Hatch Mill, a dyeing and finishing operation), which closed its
operations in Spring 1994. Currently, the Town receives only domestic sewage plus
septage from commercial haulers. The Town's pretreatment program has been
inactivated since 1994. The current permit was modified in December 1994 for two
metals (chromium and silver), after the industrial source was removed. ARO is
currently requesting additional modifications to the metals limits and/or monitoring
requirements.
Proposed Permit Changes. Facility Class changed from III to II, with associated
changes in monitoring frequency for toxicants. A Reasonable Potential Analysis (RPA)
was conducted using data for the last 24 months (1996-1997 calendar years). Limits and
monitoring requirements were deleted for chromium and nickel, and modified for other
metals.
DMR Data. Facility appears to be compliant for the 1996-1997 calendar years. Of 9
quarterly chronic toxicity test results submitted between 1996-97, there was only one
reported test failure.
Staff Report. ARO submitted a staff report on 5/18/98. ARO recommends permit
renewal, with modification of metals limits and/or monitoring frequencies. Specifically,
ARO recommends that chromium, nickel, silver, and mercury be removed from new
permit due to limited detections. ARO also recommends only quarterly monitoring with
no limits for the following detected metals (cyanide, cadmium, copper, lead, and zinc).
WLA/Receiving Stream. The facility discharges to an UT to Whiteoak Creek, which is
classified C waters (classified 9/1/74, Index No. 9-29-46). Downstream uses include

fish and wildlife habitat and propagation. The receiving stream is not listed in the 1998
303(d) listing, and available data indicate the water meets its uses. There are no
instream monitoring requirements in the current permit for this facility.
The current permit limits were based on a 1993 WLA which used a 7Q10 = 2.1 cfs. It
was indicated (1994 memo) that the USGS flow data was being revised, and a 7Q10 =
0.96 cfs would be more appropriate for this discharge outfall. Since it is NPDES policy
not to change flow values unless there is an expansion, the old 7Q10 = 2.1 cfs was used
for this permit renewal and reasonable potential analysis. Upon any future expansion, a
7Q10 of 0.96 cfs should be used in the updated WLA/R.PA. Based on last WLA,
ammonia limits (summer and winter) would be appropriate to protect for potential
instream toxicity; however, it appears that facility has elected to replace ammonia limits
with quarterly chronic WET toxicity testing.

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0021369 (Continued)
Proposed Schedule for Permit Issuance
Draft Permit to Public Notice: 09/09/98
Permit Scheduled to Issue: 10/26/98
State Contact
If you have any questions on any of the above information or on the attached
permit, please contact Tom Belnick at [phone], extension 543.
Copies of the following are attached to provide further information on the permit
development:
• Reasonable Potential Analysis (majors only)
• Existing permit effluent sheets with changes noted (existing facilities only)
• Draft Permit
NPDES Recommendation by:
Date: 730 - qS
Regional Office Comments
This space is used by the Regional office personnel to identify specific concerns in
reference to issuance of the subject permit.
(rrr) vemdzo ow/ • 'Ae
/1-04t4;4,3ed ty ercl
earya , C9liu- 4//)17;,,toatt,7
Regional Recommendation b
Reviewed By:
Regional Supervisor:
NPDES Unit:
ate:

SOC priority:
yes _x_no
TO: STATE ENGINEERING & REVIEW GROUP
FAX: [phone]
ATTN: TOM BELNICK
FROM: WATER QUALITY SECTION
ASHEVILLE REGIONAL OFFICE
WANDA P. FRAZIER
DATE: MAY 18, 1998
NPDES STAFF REPORT AND RECOMMENDATION
PART I - GENERAL INFORMATION
1. Facility name:
County:
Permit number:
Name:
Address:
Phone:
2. Date of Inspection:
3. Inspector/Report By:
4. Persons Contacted:
Telephone Number:
5. Directions to Site:
Town of Columbus
P. 0. Box 146
Columbus, North Carolina 28722
Polk
NC0021369
David Lane, Town Administrator
PO Box 146; Columbus, NC 28722
828-894-8236
May 12, 1998
Wanda P. Frazier
Bob Barwell, ORC
828-894-3055
The facility is located on
NCSR 1531 east of Columbus, NC
6. Discharge Point:
Latitude: 35° 15' 13" Longitude: 82° 09' 56"
Note: Attached is a USGS map extract, indicating the
facility site and discharge point(s) on the map using
USGS Quad No.: F10 SW USGS Quad Name: Mill Spring, NC
7. Is the site size and expansion area consistent with
application? not applicable
8. Topography (relationship to flood plain included):
slightly rolling
9. Location of nearest dwelling: >100 feet
-1-

10. Receiving stream or affected surface waters:
UT to Whiteoak Creek
a. Classification: C
b. River Basin & subbasin no: Brd 03-08-02
c. Describe receiving stream features and pertinent
downstream uses: fish and wildlife and habitat and
propagation
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. What is the volume of wastewater to be permitted in
MGD (Ultimate Design Capacity)? 0.800 MGD
b. What is the current permitted capacity of the
Wastewater Treatment facility? 0.800 MGD
c. What is the actual treatment capacity of the current
facility (current design capacity)? 0.800 MGD
d. What is/are the date(s) and construction activities
allowed by previous Authorizations to Construct issued
in the previous two years? n/a; an A to C has NOT
been issued within the past two years.
e. Provide a description of existing or substantially
constructed wastewater treatment facilities.
Existing 0.8 MGD extended aeration activated sludge
basins, clarifier, chemical addition, with effluent
disinfection.
f. Provide a description of proposed wastewater treatment
facilities. n/a; no facilities proposed.
g What are the possible toxic impacts to surface waters?
None, other than chlorine. There are no industrial
discharges at this time, only septage from commercial
haulers and a small contribution from commercial
establishments. A small quantity of "Epfloc" polymer
is used to assist with coagulation and settling.
h. Is there a pretreatment program (POTWs only)?
in development
should be required
approved
_x_not needed
2. Residuals handling and utilization/disposal scheme:
-2-

a. Are residuals being land applied?
Yes Permit Number: WQ002645
Residuals Contractor: n/a (Town of Columbus)
Telephone Number: n/a
b. Residuals stabilization: x PSRP PFRP OTHER
c. Landfill: none
d. Other disposal/utilization scheme: none
3. Treatment plant classification: Class II (48 points)
Note: Previous ratings classified facility as Class III.
See attached completed rating sheet.
4. SIC Codes(s): 4952
Wastewater code(s) - Primary:
- Secondary:
Main Treatment Unit Code: 312-3
01
none
PART III - OTHER PERTINENT INFORMATION
1. Is this facility (municipals only) being constructed with
Construction Grant Funds or are any public monies involved?
n/a
2. Special monitoring or limitations (including toxicity)
requests: No special monitoring requirements at this time.
3. Important SOC, JOC, or Compliance Schedule dates: n/a
Dates:
Submission of Plans and Specifications: n/a
Begin Construction: n/a
Complete Construction: n/a
PART IV - EVALUATION AND RECOMMENDATIONS
1. Compliance: The facility's operation has demonstrated
compliance for the past year (see attached compliance
evaluation analysis).
2. Pretreatment: The pretreatment program has been inactivated
due to the discontinuation of Milliken's discharge in the
spring of 1994.
3. Metals: The current permit was revised 12-30-94 for
chromium; the limit was removed and monitoring frequency
-3-

changed from weekly to monthly. Also, the monitoring
frequency was changed from twice a month to monthly for
silver. See attached letter date August 31, 1994 from
McGill Associates (consulting engineers) requesting
removal of listed metals from the permit.
According to the compliance evaluation nalysis port:
There have been no "hits" for chromium, nickel,
silver, and mercury. ARO recommends that these
parameters be removed from the new permit.
There have been "hits" for cyanide, cadmium, copper,
lead and zinc. ARO recommends that these parameters
should be monitored quarterly with no permit limits.
4. Recommendations: The Asheville Regional Office recommends
renewal of NPDES permit # NC0021369 with modifications and/
or removal of limits and/or monitoring frequencies for
metals mentioned above (Part IV #3). This facility was
rated a Class III, it is now a Class II. Please change
monitoring requirements accordingly.
2a:270/a
i . - a
Signature of Report parer
ater Quality Regional Supervisor
I 7 a
Date
-4-

Facility Name =
Columbus VVVVTP
arameter =
NPDES # =
NC0021369
Standard =
Qw (MGD) =
0.8
Qw (cfs) =
1.23776
7Q10s (cfs)=
2.1
n
!WC (%) =
37.13
FINAL RESULTS
FOD I- Oil
Cadmium
Max. Pred Cw
Luti } 111.0
5/103
_
Allowable Cw
5.4
Chromium
Max. Pred Cw
gewswe 19.8
1/28
Allowable Cw
134.7
Nickel
Max. Pred Cw
Rl M 04 t 6.6
2/103
Allowable Cw
237.0
Lead
Max. Pred Cw
(NA t-Ji r 62.5
18/103
Allowable Cw
67.3
Cyanide
Max. Pred Cw Mo* 1 6.250
7/103
Allowable Cw 13.468
Mercury
Max. Pred Cw
Mo ki IV 0.5
1/103
Allowable Cw
0.032
copper (AO
Max. Pred Cw
50/50
Allowable Cw
18.855
Zinc (AO
Max. Pred Cw
'11toHi 412.8
50/50
Allowable Cw
134.7
Silver (AC}
Max. Pred Cw
11.8
2/25
Allowable Cw
o,W
0.16
6,tha NoDFS
7-z9-48 J
WLtftAir-
TomcoT ,3AT?4 --=

Cadmium
l
2
pg/I
DL=1/2DL
tual Data
RESULTS
1.2
Std Dev.
5.379653
3
Mean
1.710769
26
C.V.
3.144581
21
n=101
30
0.5
<1
Mult Facto
3.7
0.5
Max. Valu
30
pg/I
0.5
Max. Pred
111
pg/I
0.5
Allowable
5.4
pg/I
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
.
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5

Parameter =
Chromium
Standard =
50
pg/I
n
DL=1/2DL
ctual DataRESULTS
1
9
Std Dev.
1.131371
2
1
<2
Mean
1.16
3
1
C.V.
0.97532
4
1
n=50
5
1
6
1
Mult Facto
2.2
7
1
Max. Valu
9
8
1
Max. Pred
19.8
9
1
Allowable
C 134.7
10
1
11
1
12
1
13
1
14
1
15
1
16
1
17
1
18
1
19
1
20
1
21
1
22
1
23
1
24
1
25
1
26
1
27
1
28
1
29
1
30
1
31
1
32
1
33
1
34
1
35
1
36
1
37
1
38
1
39
1
40
1
41
1
42
1
43
1
44
1
45
1
46
1
47
1
48
1
49
1
50
1

rameter =
Nickel
tandard =
88
pg/I
n
DL=1 /2DL
ctual Dat
ESULTS
1
6
Std Dev.
0.198
2
6
Mean
5.04
3
5
<10
C.V.
0.039
4
5
n=50
5
5
6
5
Mult Factor
1.1
7
5
Max. Value
6
8
5
Max. Pred
C 6.6
9
5
Allowable C
237.0
10
5
11
5
12
5
13
5
14
5
15
5
16
5
17
5
18
5
19
5
20
5
21
5
22
5
23
5
24
5
25
5
26
5
27
5
28
5
29
5
30
5
31
5
32
5
33
5
34
5
35
5
36
5
37
5
38
5
39
5
40
5
41
5
42
5
43
5
44
5
45
5
46
5
47
5
48
5
49
5
50
5

rameter =
Lead
tandard =
25
pg/I
n
DL=1/2DLtual
Data
RESULTS
1
2.3
Std Dev.
4.29
2
4.9
Mean
2.64
3
6
C.V.
1.625
4
3.1
n=65
5
6.6
6
2.7
Mult Factor
2.5
7
2.9
Max. Value
25
8
2
Max. Pred
C 62.5
9
7
Allowable C
67.3
10
6.7
11
2.5
12
2
13
2.6
14
17
15
11
16
25
17
17
18
3.3
19
1
<2
20
1
21
1
22
1
23
1
24
1
25
1
26
1
27
1
28
1
29
1
30
1
31
1
32
1
33
1
34
1
35
1
36
1
37
1
38
1
39
1
40
1
41
1
42
1
43
1
44
1
45
1
46
1
47
1
48
1
49
1
50
1
51
1
52
1
53
1
54
1
55
1
56
1
57
1
58
1
59
1
60
1
61
1
62
1
63
1
64
1
65
1
66

rameter =
Cyanide
tandard =
5
pg/I
n
DL=1/2DLtual
Data
RESULTS
1
6
Std Dev.
3.671
2
28
Mean
2.5
3
17
C.V.
1.468
4
5
n=65
5
6
6
5
Mutt Factor
2.5
7
6
Max. Value
2.5
8
2.5
<5
Max. Pred
C6.250
9
2.5
Allowable C114/4*#
10
2.5
11
2.5
12
2.5
13
2.5
14
2.5
15
2.5
16
2.5
17
2.5
18
2.5
19
2.5
20
2.5
21
2.5
22
2.5
23
2.5
24
2.5
25
2.5
26
2.5
27
2.5
28
2.5
29
2.5
30
2.5
31
2.5
32
2.5
33
2.5
34
2.5
35
2.5
36
2.5
37
2.5
38
2.5
39
2.5
40
2.5
41
2.5
42
2.5
43
2.5
44
2.5
45
2.5
46
2.5
47
2.5
48
2.5
49
2.5
50
2.5
51
2.5
52
2.5
53
2.5
54
2.5
55
2.5
56
2.5
57
2.5
58
2.5
59
2.5
60
2.5
61
2.5
62
2.5
63
2.5
64
2.5
65
2.5

rameter =
Mercury
PE
tandard =
0.012
pg/I
n
DL=1/2DLtual
Data
RESULTS
1
0.4
Std Dev.
0.037
2
0.1
<0.2
Mean
0.105
3
0.1
C.V.
0.356
4
0.1
n=65
5
0.1
6
0.1
Mulf Factor
1.35
7
0.1
Max. Value
0.4
Ng/
8
0.1
Max. Pred
C 0.54
Ng/
9
0.1
Allowable C
0.03
Ng/
10
0.1
11
0.1
12
0.1
13
0.1
14
0.1
15
0.1
16
0.1
17
0.1
18
0.1
19
0.1
20
0.1
21
0.1
22
0.1
23
0.1
24
0.1
25
0.1
26
0.1
27
0.1
28
0.1
29
0.1
30
0.1
31
0.1
32
0.1
33
0.1
34
0.1
35
0.1
36
0.1
37
0.1
38
0.1
39
0.1
40
0.1
41
0.1
42
0.1
43
0.1
44
0.1
45
0.1
46
0.1
47
0.1
48
0.1
49
0.1
50
0.1
51
0.1
52
0.1
53
0.1
54
0.1
55
0.1
56
0.1
57
0.1
58
0.1
59
0.1
60
0.1
61
0.1
62
0.1
63
0.1
64
0.1
65
0.1

rameter =
copper
tandard =
7
pg/I
(AL)
n
DL=1/2DL
ctual DataRESULTS
1
13
Std Dev.
8.961
2
20
Mean
16.24
3
9
C.V.
0.552
4
8
n=50
5
18
6
7
Mult Factor
1.65
7
12
Max. Value
50
8
10
Max. Pred
C 82.5
9
10
Allowable C
18.9
10
10
11
13
12
9.9
13
10
14
16
15
8
16
16
17
10
18
13
19
12
20
18
21
18
22
15
23
14
24
14
25
26
26
19
27
12
28
16
29
18
30
16
31
21
32
29
33
22
34
50
35
21
36
14
37
43
38
17
39
12
40
12
41
6
42
8
43
8
44
9
45
39
46
31
47
13
48
12
49
18
50
16
51

rameter =
Zinc
tandard =
50
Ng/I
,(AL)
n
DL=1/2DL
ctual Dat
ESULTS
1
96
Std Dev.
51.17
2
159
Mean
101.5
3
51
C.V.
0.504
4
91
n=50
5
116
6
67
Mult Factor
1.6
7
98
Max. Value
258
8
55
Max. Pred
C 412.8
9
97
Allowable C
134.7
10
52
11
90
12
81
13
104
14
63
15
103
16
36
17
142
18
63
19
96
20
101
21
79
22
57
23
143
24
140
25
79
26
90
27
64
28
141
29
69
30
123
31
123
32
59
33
87
34
73
35
109
36
212
37
133
38
12
39
181
40
245
41
168
42
92
43
68
44
76
45
183
46
258
47
37
48
72
49
78
50
63
51

Parameter =
Silver
Standard =
0.06
pg/I
(AL)
n
BDL=1/2DL
Actual Data
RESULTS
1
5.6
Std Dev.
0.9338094
2
3
Mean
1.6
3
1.5
<
C.V.
0.58363088
4
1.5
n=26
5
1.5
6
1.5
Mult Factor
2.1
7
1.5
Max. Value
5.6
8
1.5
Max. Pred Cyv
11.76
9
1.5
Allowable Cv
0.16
10
1.5
11
1.5
12
1.5
13
1.5
14
1.5
15
1.5
16
1.5
17
1.5
18
1.5
19
1.5
20
1.5
21
1.5
22
1.5
23
1.5
24
0.5
<
25
0.5
26
0.5
27

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