NC0021369_Wasteload Allocation_19941230

NPDES DOCUWENT !MANNINO COVER SHEET
NC0021369
NPDES Permit:
Columbus WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
i
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
December 30, 1994
This document is printed on reuse paper - i$ziore any
contest an the reverse 'aide

Ikpy AI ()DE.)
Pei 7n1.
DIVISION OF ENVIRONMENT MANAGEMENT
December 30, 1994
MEMORANDUM
TO: Charles Al
THRU:
FROM:
SUBJECT:
Don
Rutl ek '5
Carla Sanderso
Jacquelyn M. Nowell
Revision of Limits/Monitoring Requirements for Columbus WWTP
NPDES Permit No. NC0021369
Polk County
The Instream Assessment Unit has reviewed the August 31,1994 letter concerning
the modification of monitoring requirements for metals and toxicants in the Columbus
permit. Current permit limitations for these parameters are as follows:
Cadmium 5.4 µg/1
Nickel 237 µg/1
Cyanide 13 µg/1
Copper monitor
Silver monitor
Chromium 135 µg/1
Lead 67 µg/1
Mercury 0.03 µg/1
Zinc monitor
The Town of Columbus reported that Hatch Mills, a major contributor of industrial waste
to the treatment plant, had closed down their dyeing and finishing operation in the spring.
With Hatch Mills now only discharging domestic wastewater and cooling tower waste, the
amount of average flow and the constituency of the Columbus WWTP effluent has changed
according to this correspondence.
The compliance monitoring data from July to October 1994 was reviewed to
determine if metals concentrations were present or at least reduced. The data showed that
most of the metals were still present in the effluent. Chromium and silver did not show up,
but neither had shown up since May, two months before Hatch Mills stopped their
operation in July. According to the actual DMRs, all values for these two parameters were
reported as less than detection. In addition, mercury and cyanide were both present in
August but have not been in the effluent since then.
All the other parameters, cadmium, nickel, lead, copper and zinc, are still present in
the approximate concentrations prior to the Hatch Mills stopping their operation. If Hatch
Mills was the sole contributor of these metals to the Columbus plant, then there should be a
more noticeable reduction in these constituents. Kerrie Becker of the ARO says that the
Columbus WWTP is accepting septage into the plant and that may explain why metals are
still present in the effluent. She spoke to the Town Manager and relayed that taking in this
type of waste could diminish their case for permit modification.

Memo toCharles Alvarez
page 2
In the four months of data that were reviewed, we are unable to determine if any
parameters can be deleted at this time. With the exception of chromium and silver, the
present compliance data does not indicate that a limit or monitoring for metals is no longer
necessary. In addition, the Town no longer has a pretreatment program that could also
monitor the plant through their pretreatment permits.
It is our recommendation that the current NPDES permit limits and monitoring
requirements remain the same. with the following exceptions:
1) Limit for Chromium can be rescinded. and changed to monthly monitoring only.
2) Frequency for silver monitoring can be reduced from 2 per month to monthly.
We are recommending the continuation of monitoring for chromium and silver to assure
that these two metals are not found in the septage waste that the Town is accepting. If they
should be found in future effluent samples, we will have enough data to evaluate. In
twelve months, the Town of Columbus can submit a written request that we review the
matter again.
If there are anyadditional questions,please contact me.
cc: Forrest Westall
WLA File

TOXICANT ANALYSIS
(0, 0/z
(2 2)(6,01Z) _ 0,0269
Facility Name
Columbus WWTP
NPDES #
NC0021369
Qw (MGD)
0.8
7010s (cfs)
_,._.._.._.._.._.._.._. 2.1
_.._.._.._ 37.13
/WC (%)
Rec'ving Stream
UT White Oak Creek
Stream Class
C
FINAL RESULTS
Cadmium
Max. Pred Cw
11.88
' ug/I
Allowable Cw
5.4
ug/I
Cr
Max. Pred Cw
11
ug/I
Allowable Cw
134.7
ug/I
Ni
Max. Pred Cw
200°ug/I
ug/I
Allowable Cw
237.0
Pb
Max. Pred Cw
138.7
ug/I
Allowable Cw
67.3
ug/I
Cn
Max. Pred Cw
10.4
ug/I
Allowable Cw
13.5Wug/I
Hg
Max. Pred Cw
0.1
pug/I
Allowable Cw
0.0
ug/I
Cu
Max. Pred Cw
25.2
ug/I
ug/I
Allowable Cw
18.9
Zn
Max. Pred Cw
214
ug/I
Allowable Cw
134.7
ug/I
Ag
Max. Pred Cw
0.0015
ug/I
Allowable Cw
0.2
ug/I
0
Max. Pred Cw
0
ug/I
ug/I
Allowable Cw
0.0
0
Max. Pred Cw
0
ug/I
Allowable Cw
0.0
ug/I
lOw.
01 :4*,
12/28/94
PAGE

COLUMBUS WWTP JMN
UT WHITE OAK CREEK C 12/28/94
030802
Town of Columbus is requesting the modification of metals limits in their permit. Facility
has these current weekly limits and 2 per month monitoring requirements for metals and
toxics:
Cadmium 5.4 µg/1
Chromium 135 p.g/1
Nickel 237 µg/1
Lead 67 µg/1
Cyanide 13 µg/1
Mercury 0.03 µg/1
Copper monitor
Zinc monitor
Silver monitor
A major industry to the town, Hatch Mills, closed down their dyeing and finishing
operations in Columbus in the spring of the year. The letter from the town's consulting
engineer states that only small amounts of domestic waste and cooling tower waste are now
discharged to the sewer system. Kerrie Becker of ARO verifies that Hatch Mills closed
down operations in June or July of this year.
Tom Poe of Pretreatment, says the Town's pretreatment permits expired in May 1994. The
Town did not cooperate with the long term monitoring plan and refused to do it for over a
year. Per T. Poe, the town will only do what its required to do, it will not follow
recommendations. Pretreatment tried to get their requirements placed in the NPDES permit
and after amending the permit, they were included. Shortly thereafter, Hatch Mills closed
down the dyeing operation.
A review of 1994 self monitoring data shows that even after July 1994 when Hatch Mills
stopped its operation, there were still hits of metals in the effluent. Kerrie Becker says that
since Hatch Mills has stopped discharging it has begun accepting septage waste and this
may contain elevated mercury levels and other metals. Since metals are still present in the
effluent. do not recommend deleting these parameters from the permit. The facility also
does not have a pretreatment program therefore requirements in the NPDES permit will be
the only way to obtain data.
TOXICANT ANALYSIS
Although Columbus has averaged a much lower wasteflow (approx. 0.186 MGD) since
Hatch Mills stopped operations, the design flow of 0.800 MGD is still used in the mass
balance equations because the town has not requested a reduction in design flow.
The 7Q10 flow of 2.1 cfs is usell in the equations also. However, in 1993, new flow
information was gotten from USGS that indicates that the flow at
Columbus's discharge point is 0.96 cfs, 55% lower than the flow that has
been used. This updated flow will be used in the future if any expansions
or modifications are requested.

COLUMBUS WWTP (page 2)
If monitoring requirements were to be reviewed, based on data from July to October '94,
the requirements would be as follows:
Cadmium
*Chromium
*Nickel
Lead
*Cyanide
Mercury
Copper
Zinc
*Silver
5.4 µg/1
not required
monitor
67 µg/1
monitor
0.03 µg/1
monitor
monitor
not required
New requirements would be: all previous limits the same with these changes - no limit or
monitoring for Chromium and Silver, revise limits to monitoring only for Nickel and
Cyanide.
If new 7Q10 flow of 0.96 cfs is used :
Cadmium
*Chromium
Nickel
Lead
Cyanide
Mercury
Copper
Zinc
*Silver
3.5 µg/1
not required
156 µg/1
44µ
8.9µg/1
0.02 µg/1
monitor
monitor
not required
p6 / ,og &)z.
Ae4,0„,.; ilff— /ohy
tea—, 4...„1, a.o6 6,6p/e

TOXICANT ANALYSIS
Facility Name
Columbus WWTP
NPDES #
NC0021369
Ow (MGD)
0.8
7010s (cfs)
0_96
_.._.._.._.._.._. .._.._.._.._..5.6.36
IWC (%)
Rec'ving Stream
UT White Oak Creek
Stream Class
C
FINAL RESULTS
Cadmium
Max. Pred Cw
11.88
ug/I
Allowable Cw
3.5ug/I
Cr
i
Max. Pred Cw
11
ug/I
Allowable Cw
88.7
l ug/I
NI
;;
Max. Pred Cw
200Eug/I
Allowable Cw
156.1
lug/I
I
;
Pb
Max. Pred Cw
138.7
lug/I
Allowable Cw
44.4
ug/I
I
Cn
Max. Pred Cw
10.4
! ug/I
Allowable Cw
8.9
! ug/I
I
Hg
Max. Pred Cw
0.11ug/I
Allowable Cw
0.0
' ug/I
Cu
Max. Pred Cw
25.2
ug/I
Allowable Cw
12.4
ug/I
Zn
Max. Pred Cw
214
1 ug/I
Allowable Cw
88.7
ug/I
Ag
Max. Pred Cw
0.0015
ug/I
Allowable Cw
0.1
ug/I
0
Max. Pred Cw
0
ug/I
Allowable Cw
0.0
ug/I
0
Max. Pred Cw
0
ug/I
Allowable Cw
0.0
ug/I
1141 NIL VIC.
igo Avoids/
1441*
iMi
Now
niv
.6/
12/28/94
PAGE'

Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN', FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ug/I)
Fecal Limit
Ratio of 1.7 :1
Ammonia as NH3
(summer)
2.1 7010 (CFS)
0.8 DESIGN FLOW (MGD)
1.24 DESIGN FLOW (CFS)
17.0 STREAM STD (MG/L)
0 UPS BACKGROUND LEVEL (MG/L)
37.13 IWC (%)
45.79 Allowable Concentration (mgli)
Ammonia as NH3
(winter)
2.1
0.8
1.24
1.0
0.22
7010 (CFS) 2.1
200/100m1 DESIGN FLOW (MGD) 0.8
DESIGN FLOW (CFS) 1.24
STREAM STD (MG/L) 1.8
UPS BACKGROUND LEVEL (MG/L) 0.22
IWC (%) 37
Allowable Concentration (mg/I)
NC0022934
12/28/94

Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ugA)
Fecal Limit
Ratio of 0.8 :1
Ammonia as NH3
(summer)
0.96 7010 (CFS)
0.8 DESIGN FLOW (MGD)
1.24 DESIGN FLOW (CFS)
17.0 STREAM STD (MG/L)
0 UPS BACKGROUND LEVEL (MG/L)
56.36 IWC (%)
30.16 Allowable Concentration (mgA)
Ammonia as NH3
(winter)
7010 (CFS)
200/100m1 DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/I)
0.96
0.8
1.24
1.0
0.22
56.36
1.60
1.5
0.8
1.24
1.8
0.22
45.26
3.71
NC0022934
12/28/94

GKEX88/MP
COMPLIANCE EVALUATION ANALYSIS REPORT
12/28/94
PAGE 1
PERMIT--NC0021369 PIPE--001 REPORT PERIOD: 9311-9410 LOC---E
FACILITY--COLUMBUS WWTP, TOWN OF DESIGN FLOW-- .8000 CLASS--2
LOCATION--COLUMBUS REGION/COUNTY--01 POLK
50050 00310 00530 00610 31616 50060 TAA3B TAA3D
MONTH Q/MGD BOD RES/TSS NH3+NH4- FEC COLI CHLORINE CERI48AC DAPH48AC
LIMIT F .8000 F 30.00 F 30.0 NOL F 200.0 NOL
93/11 .1822 1.50 7.5 1.20 .0 .314
LIMIT F .8000 F 30.00 F 30.0 NOL F 200.0 NOL NOL NOL
93/12 .1793 3.00 12.0 1.20 1.4 .300
94/01 .2022 6.00 4.5 9.40 .0 .295
94/02 .1993 4.00 7.0 8.00 .0 .895
94/03 .2189 2.00 7.2 .14 9.4 1.226
94/04 .2021 2.25 3.2 1.45 3.4 .720
94/05 .1825 3.25 2.7 .40 2.1 .952
94/06 .1679 .00 6.0 .26 2.1 1.057
94/07 .1606 .00 2.0 .36 2.0 1.011
94/08 .1994 .40 12.4 .19 4.7 1.230
94/09 .1549 1.00 8.2 .54 1.2 1.062
94/10 .1809 .75 9.2 .68 1.6 .819
AVERAGE .1858 2.01 6.8 1.98 2.3 .823
MAXIMUM .5340 7.00 23.0 9.40 4700.0 3.000
MINIMUM .0340 LESSTHAN LESSTHAN LESSTHAN LESSTHAN .000
UNIT MGD MG/L MG/L MG/L #/100ML MG/L PASS/FAI PASS/FAI

GKEX88/MP
COMPLIANCE EVALUATION ANALYSIS REPORT
12/28/94
PAGE 3
PERMIT--NC0021369 PIPE--001 REPORT PERIOD: 9311-9410 LOC---E
FACILITY--COLUMBUS WWTP, TOWN OF DESIGN FLOW-- .8000 CLASS--2
LOCATION--COLUMBUS REGION/COUNTY--01 POLK
01042 01051 01067 01077 01092 71900
MONTH COPPER LEAD NICKEL SILVER ZINC MERCURY
6,7u5/L 237 "J/ 0.03 ,Alit,
LIMIT NOL NOL NOL
93/11
.0000 2.4000 45.0000 0000 .0710 .0000
LIMIT NOL
93/12 .0100 12.5000 15.0000 .0000 .0830
94/01 .0000 6.1000 65.0000 .0000 .0930
NOL NOL
.0000
94/02 .0180 2.3000 25.0000 .0000 .1030 .0000
94/03 .0655 6.2000 34.2000 .0030 .1440
94/04 .0105 2.2500 37.5000 .0030 .0600 CD
94/05 .0000 .6250 12.5000 .0000
94/06 .0072 3.2000 28.0000 .0000
.0550
.0000
94/07 .0050 6.1500 27.5000 .0000 .0175 .0000
94/08 .0100 1.4000 12.0000 .0000 .0460
.0600
94/09 .0090 .5000 5.0000 .0000 .0675 .0000
94/10 .0105 .0000 12.5000 .0000 .0880 .0000
AVERAGE .0121 3.6354 26.6000 .0005 .0765 .0800
MAXIMUM .1100 19.0000 80.0000 .0030 .1460 .7000
MINIMUM .0100 2.0000 10.0000 .0030 .0270 .2000
UNIT MG/L UG/L UG/L MG/L MG/L UG/L

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2/c04.-...- •
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10t41- Atf/e
idite ezi AAA
4y/a 441/ dobol 014.'1 ti-04%/03v,
,/121---- • jj /0A
/ -1279“*(601 /vi 7,4
1:34-ga Aire_
emAx4;
etA".a.
i/tie.A.0C0f4.'

GKEX88/MP
COMPLIANCE EVALUATION ANALYSIS REPORT
12/28/94
PAGE 2
PERMIT--NC0021369 PIPE--001 REPORT PERIOD: 9311-9410 LOC---E
FACILITY--COLUMBUS WWTP, TOWN OF DESIGN FLOW-- .8000 CLASS--2
LOCATION--COLUMBUS REGION/COUNTY--01 POLK
TGP3B 00010 00400 00600 00665 00720 01027 01034
MONTH CERI7DPF TEMP PH TOTAL N PHOS-TOT CYANIDE CADMIUM CHROMIUM
LIMIT NOL 9.0 6.0
93/11 12.85 7.3-6.8
LIMIT NOL NOL 9.0 6.0 NOL NOL
93/12 1 8.00 7.6-6.6
94/01 5.85 7.5-6.8
94/02 9.85 7.5-6.7
94/03 1 11.43 7.4-6.5 8.910 .6200 5.0000 1.7000 9.0000
94/04 16.30 7.4-6.5 5.0000 1.0000 10.0000
94/05 19.80 7.1-6.8 7.0000 .0000 .0000
94/06 1 22.63 7.2-6.4 4.4000 .3600 .0000
.0000 .0000 .0000
.0000
.9500 15.5000
.0000
.0000 1.7500 .0000
94/07 24.77 7.2-6.7 10.800 2.0000 .0000 .0000 .0000
94/08 23.08 7.8-6.3 1.3000 .0000
94/09 19.52 7.4-6.5 15.580 1.2800 .0000 1.3750 .0000
94/10 1 14.42 7.3-6.7 .0000 1.3250 .0000
AVERAGE 1 15.70 11.763 1.3000 2.4333 1.2781 2.8750
MAXIMUM 1 28.00 7.800 15.580 2.0000 18.0000 8.8000 20.0000
MINIMUM 1 4.00 6.300 8.910 .6200 5.0000 1.0000 5.0000
UNIT PASS/FAI DEG.0 SU MG/L MG/L UG/L UG/L UG/L

To:
DIVISION OF ENVIRONMENTAL MANAGEMENT
Water Quality
Permits and Engineering Unit
December 7, 1994
Ruth Swanek, Supervisor, Instream Assessment Unit
From: Charles Alvarez, Environmental Engineer, NPDES Permits,
4,-)JS
Wasser Qualitat
Subject: Columbus WWTP, NC0021369, Polk County
Attached is a letter from the consultants for the Town of
Columbus. Based on the closing of the town's only SIU, the town
requests to delete metals from the NPDES permit. Please provide
comments as to whether this is appropriate for this facility.
If you need any more information please call me at 733-5083
ext 553.
�t

McGILL ASSOCIATES, P.A.
CONSULTING ENGINEERS
August 31, 1994
A. Preston Howard, Jr., P.E., Director
Division of Environmental Management
Post Office Box 29535
Raleigh, North Carolina 27626-0535
Dear Mr. Howard:
SEP
WA i"
„ I
6 09
: Ir, r•s
SEC iC`
'SEP 6 1994
a � F� �iTAL MGM •
DIRECTOR'S QIV. OF !� ORS OFFICE
RE: NPDES Permit No. NC0021369
Town of Columbus WWTP
Polk County
The Town of Columbus has requested that we submit this letter to request that the Division of
Environmental Management review NPDES Permit No. NC0021369 issued to the Town of Columbus, and
if possible, modify the testing requirements shown in Section A. The Town operates a 0.80 MGD wastewater
treatment plant with discharge to a tributary to White Oak Creek. Until recently, the majority of flow to the
system came from a single industry, Hatch Mill.
In the sprin of thi Hatch Mill closed down their dyeing and finishing operations in Columbus.
Only small amounts of domestic waste and cooling tower waste are now discharged to our sewer system.
The result is that the average daily flow to our facility has decreased to approximately 0.20 MGD. Flow is
predominantlyldomestic in nature with a small contribution from commercial establishments.
Our permitcurrentlyrequires testing for the following parameters:
�:�FF�.UEiV�:C : AC�EI�1STtCS
� ��ItLlf`. _ �A1�.
.:R E Y. U �i.
E C..:.:..
Cadmium
5.4 ug/i
Weekly
Chromium
135.0 ug/I
Weekly
Nickel
237.0 ug/I
Weekly
Lead
67.0 ug/I
Weekly
Cyanide
13.0 ug/I
Weekly
Mercury
0.03 ug/I
Weekly
Copper
-
2/month
Zinc
-
2/month
Silver
-
2/month
••
w••
c =�
P.O. BOX 2259 704/252-0575 / 38 ORANGE STREET
ASHEVILLE, NC 28802 / 704/252-2518 (FAX) ASHEVILLE, NC 28801

r a•
A. Preston Howard, Jr., P.E., Director
August 31, 1994
Page 2
With the closing of Hatch Mill and the resulting decrease in flow quantity and characteristics, we would
like to request that the testing for the above parameters be removed from our permit. As a minimum, we
would request that the sampling frequency be reduced to one time per month for each of the parameters
listed above.
If there are any questions, please give me a call at [phone].
Sincerely,
McGILL ASSOCIATES, P.A.
M. KEITH WEBB, P.E.
CES:jIj
cc: Butch Smith
Carrie Becker
94166
phl7.aug\webb

MAR-01-1993 17:25 FROM DEM C!-EM I STRY LABORATORY TO
39919 P.01/01
•
Ag
Al
As
Ba
Be
Ca
Cd
Co
Cr
Cu
Fe
Hg
Li
R
Mg
Mn
Mo
Na
Ni
Pb
Sb
Se
sn
Y
Zn
REPORTING LIMITS FOR METALS ANALYSES
Water - Water
Rcuti a (uqf 1) Low Level (u4j1)
25 5.0
50
N/A 10
500
25
0.02 mg/1 - •
10 ;` Z-.
50 -
25 5.0
10 2.0
50
0.2
0.02 mg/1
25
0.02mng/1
25 •
SO.
0.02 mg/1
50 10
50 10
500 50
5.0
2500 -
100
10
Post -It"' brand fax transmittal memo 7671
I s of pans ► /
7.
Pre
O.
Co.
Ca
� _• �
Phone 0.9.
7
3 3- 3 fo d,
i x
-I33- 9giq
Fix
Sediment/Tissue(Mg/Rg)
0.25
0.50
2.0
0.25
0.25
0.10
0.50
0.25
0.10
0.50
0.02
0.25
0.25
0.25
0.25
0.50
0.25
0.50
0.50
0.50
25
1.0
0.10
TOTAL P.01