NC0026123_Speculative Limits_19910618

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27604
James G. Martin, Governor George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary Director
W. Max Frazier June 18, 1991
Black & Veatch
5540 Centerview Drive, Suite 114
Raleigh, NC 27606
Subject: Asheboro WWTP
NPDES No. NCO026123
Randolph County
Dear W. Frazier:
My staff has reviewed your request for speculative limits for a proposed expansion of the
Asheboro W WTP from 6.0 MGD to a capacity between 9.0 and 12.0 MGD. A discharge to either
Hasketts Creek or the Deep River will result in stringent limits. Since Hasketts Creek has a 7Q 10
flow of zero cfs, limits will be 5 mg/l for BOD5 and 1 mg/l for NH3-N. The instream waste
concentration will remain at 100% and metals will be limited to the water quality standards. Given
that the 7Q 10 at the proposed relocation point is 8.0 cfs, the Deep River will provide greater
assimilative capacity though stringent treatment limits will be required due to interaction with other
discharges in the basin.
The Division is initiating a basinwide management strategy for the state. All NPDES permits
within a given basin will be renewed in the same year allowing the Division to examine interaction
among all point and non -point sources of pollutants for that basin. The basin plan for the Cape Fear
River should be promulgated by 1996. In the meantime, discharge limits will be based on existing
procedures. Currently, all new or expanding discharges to the Deep River receive limits of 5 mg/1
for BOD5 and 2 mg/l for NH3-N or less due to chronic problems meeting the dissolved oxygen
standards in the river during the summer months. Metals limits and/or monitoring requirements will
be determined based on the nature of the effluent. The following metals limits have been estimated
based on existing pretreatment information and interaction with the Randleman W WTP discharge.
Standard 9 MGD 12 MGD
Cadmium (ug/1)
2
2.4
2.3
Chromium (ug/1)
50
61
58
Nickel (ug/1)
88
107
102
Lead (ugh)
25
30
29
Cyanide (ug/1)
5
6.1
5.8
Mercury (ug/1)
0.012
0.019
0.017
IWC
na
64%
70%
Pollution
Prevention
Pays
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

-2-
The limits for all wasteflows, 9.0 to 12.0 MGD will be:
BOD5 (mg/1)
NH3-N (mg/1)
DO (mom)
TSS (mg/1)
Fecal Coliform (#/100 ml)
pH (su)
Chlorine (mg/1)
Hasketts Creek
summer/winter
5/10
1/2
6
30
200
6-9
0.017.
Deep River
summer/winter
5/10
2/4
6
30
200
6-9
0.028
The above limits are speculative and are for use in an engineering review of discharge
alternatives. Final limits will be provided upon receipt of an application for NPDES permit. If you
have any questions regarding the above issues, please contact Betsy Johnson or myself at (919) 733-
5083.
JTC/eaj
cc: Don Safrit
Steve Mauney
Central Files
Sinc- ely,
, J. revor Clements, As . Chief
ter Quality Section
Pollution Prevention Pays
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

a
State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
P.O. Box 27687
Raleigh, NC 27611
WATER QUALITY SECTION
FAX # [phone]
TELECOPY TO:
FAX NUMBER:« --
FROM: PHONE: 733-Sas3
NO. OF PAGES, INCLUDING COVER SHEET: .3
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T 0 X I C S R E V I E W 05/30/91
__________________________ ver 3.0
Facility: CITY OF ASHEBORO
NPDES Permit No.: NCO026123
Status (E, P, or M): M
Permitted Flow: 12.00 mgd
Actual Average Flow: 4.50 mgd
Subbasin: 30609.00
Receiving Stream: HASKETTS CREEK
Stream Classification: C
7010: 0.00 cfa
IWC: 100.0 i
------------------------
P R E T
R E A T M
E N T D A
T A -----------
------
®-- EFFLUENT DATA ---
ACTUAL
ACTUAL
PERMITTED
I
I
I
or
Ind. +
Ind. +
I ACTUAL
ACTUAL I
I
Default
ACTUAL
Domestic
PERMITTED
Domestic
I Maximum
Weekly I
Standard
Acute
Removal
Allowable
Domestic
Industrial
Total
Industrial
Total
I Daily
Average I
Pollutant
AL
Criteria I
Eff.
Load
Load
Load
Load
Load
Load
I Value
Value I
_________
__
(ug/1)
______
(ug/1) I
_________1
%
_________
(4/d)
_________
(1/d)
_________
(4/d)
---------
(4/d)
________
(4/d)
_______
(f/d)
________
I (ug/1)
(ug/1) I
Cadmium
S
2.0
1.79 I
92%
0.94
0.06
0.007
0.07
0.12
0.177
I ---------
I
_________
Chromium
S
50.0
984 1
89%
17.08
0.21
0.68
0.89
17.98
18.190
I
6.00
Copper
AL
7.0
9.2 I
60t
0.66
0.42
1.96
2.38
10.07
10.490
I
71.50
Nickel
S
88.0
789 I
39%
5.42
0.21
0.26
0.47
1.33
1.540
I
7.00
Lead
S
25.0
34 I
sit
4.94
0.21
0.17
0.38
0.72
0.927
I
6.60
Zinc
AL
50.0
65 I
60%
4.70
2.08
2.50
4.58
21.38
23.460
I
190.00
Cyanide
S
5.0
22.0
59%
0.46
0.21
0.0024
0.21
0.27
0.477
I
0.01 I
Mercury
S
0.012
2.4
86%
0.00
0.01
0.0003
0.01
0.02
0.032
I
I
Silver
AL
0.060
1.2
944
0.04
I
I
Selenium
S
5.0
20 I
80%
0.94
I
I
Arsenic
S
50.0
360 1
25%
2.50
3.34
0.38
3.72
1.13
4.470
I
I
Phenols
S
NA
I
I
I
----------------------------
---
A N A L Y S
I S R E
S U L T S
--- -------
"----------
me ---- -----
e-e---
I
I
Monitor / Limit / Special Condition•
I
I
Allowable
Allowablel
Predicted
Predicted I
I
Effluent
Effluent
on ACTUAL
on PERMIT.1
Actual
Actual
INSTREAM MONITORING I
Bkg I
Cone.
Cone. I
Influent
Influent I
ACTUAL
PERMITTED
Daily Max.
Wk. Avg.
Based on
Based on l
Pollutant
Cone. I
CHRONIC
ACUTE I
Data
Data I
Influent
Influent
Effluent
Effluent
I Actual
Actual I
(ug/1)
(ug/1)
lug/1) I
lug/1)
(ug/1) I
Loading
Loading
Data
Data
I Daily Max.
Wk. Avg. I
_________
Cadmium
__
S
______
I
________
2.000
________ I
1.790 I
_________
0.143
-------- 1
0.377 I
________
Monitor
________
Limit
_________
_________
I ________
I
--------
I
Chromium
S
1
50.000
984.320 1
2.591
53.256 I
Monitor
Limit
Limit
I
I
Copper
AL
I
L.7.000
9.220 I
25.338
111.680 I
Monitor
Monitor
Special
Monitor I
Nickel
S
I
88.000
789.000 I
7.631
25.003 I
Monitor
Limit
Monitor
I
I
Lead
S
I
25.000
33.780
1.942
4.688
Monitor
Limit
Limit
I
I
Zinc
AL
I
(50.000)
65.040 1
48.760
249.762 I
Monitor
Monitor
Special
I
Monitor I
Cyanide
S
I
5.000
22.000 I
2.318
5.205 I
Limit
Limit
I
Mercury
S
I
0.012
2.400
0.038
0.119 I
Limit
Limit
I
S11 _
AL
I
0.060
1.230
0.000
0.000 I
I
I
Selenium
S
I
5.000
20.ODO I
0.000
0.000 I
I
Arsenic
S
50.000
360.000 I
74.338
89.229 I
Limit
Limit
I
I
Phenols
S
I
0.000
0.000 I
0.000
0.000 I
I

T 0% I C S R E V I E W 05/30/91
__________________________ ver 3.0
Facility: CITY OF ASHEBORO
NPDES Permit No.: NCO026123
Status (E. P. or M): M
Permitted Flow: 9.00 mgd
Actual Average Flow: 4.50 mgd
Subbasin: 30609.00
Receiving Stream: HASKETTS CREEK
Stream Classification: C
7Q10: 0.00 cfs
INC: 100.0 4
------------------------
P R E T
R E A T M E
N T D A
T A -----a------
o-- EFFLUENT DATA ---
I
ACTUAL
ACTUAL
PERMITTED
I
I
I
or
Ind. +
Ind. +
ACTUAL
ACTUAL I
I
Default
ACTUAL
Domestic
PERMITTED
Domestic
I Maximum
Weekly I
Standard
Acute I
Removal
Allowable
Domestic
Industrial
Total
Industrial
Total
I Daily
Average 1
Pollutant
AL
Criteria I
Eff.
Load
Load
Load
Load
Load
Load
Value
Value I
--------
__
(ug/1)
______
(ug/1) I
________I
k
_________
(#/d)
_________
(#/d)
_________
(#/d)
--------
(#/d)
-------
(#/d)
(#/d)
I (ug/1)
(ug/1) I
Cadmium
S
2.0
1.79
92%
0.94
0.06
0.007
0.07
_______
0.12
________
0.177
_________
I
_________
Chromium
S
50.0
984 1
89%
17.08
0.21
0.68
0.89
17.98
18.190
6.00
Copper
AL
7.0
9.2
60%
0.66
0.42
1.96
2.38
10.07
10.490
I
71.50
Nickel
S
88.0
789 I
394
5.42
0.21
0.26
0.47
1.33
1.540
7.00 1
Lead
S
25.0
34
sit
4.94
0.21
0.17
0.38
0.72
0.927
6.60 I
Zinc
AL
50.0
65 I
60%
4.70
2.08
2.50
4.58
21.38
23.460
190.00 I
Cyanide
S
5.0
22.0 1
59%
0.46
0.21
0.0024
0.21
0.27
0.477
0.01 I
Mercury
S
0.012
2.4 I
86%
0.00
0.01
0.0003
0.01
0.02
0.032
I
Silver
AL
0.060
1.2 1
94%
0.04
1
Selenium
S
5.0
20 1
80%
0.94
I
Arsenic
S
50.0
360 I
25%
2.50
3.34
0.38
3.72
1.13
4.470
I
Phenols
S
NA
I
-------`------------------------
A N A L Y S
I S R E
S U L T S ---'--------------------'--------------------
I
Monitor / Limit / Special Condition-
I
Allowable
Allowablel
Predicted
Predicted I
I
I Effluent
Effluent I
on ACTUAL
on PERMIT.1
Actual
Actual
I INSTREAM MONITORING I
Bkg
I Cone.
Cone. I
Influent
Influent I
ACTUAL
PERMITTED
Daily Max.
Wk. Avg.
I Based on
Based on I
Pollutant
Cone.
I CHRONIC
ACUTE I
Data
Data I
Influent
Influent
Effluent
Effluent
I Actual
Actual I
(ug/1)
I 4ug/1)
(ug/1) I
(ug/1)
(ug/1) I
Loading
Loading
Data
Data
I Daily Max.
Wk. Avg. 1
_________
Cadmium
__
S
______
1 ________
I 2.000
-------- 1
1.790 I
---------
0.143
------- 1
0.377 I
_______
Monitor
________
Limit
_________
_________
I ________
I
______-_ 1
I
Chromium
S
I 50.000
984.320 I
2.591
53.256 I
Monitor
Limit
Limit
I
I
Copper
AL
I (7.000)
9.220 1
25.338
111.600 I
Monitor
Monitor
Special
I
Monitor I
Nickel
S
1 88.000
789.000 1
7.631
25.003 I
Monitor
Limit
Monitor
I
I
Lead
S
1 25.000
33.780 I
1.942
4.688 1
Monitor
Limit
Limit
I
Zinc
AL
I (50.000)
65.040 I
48.760
249.762 I
Monitor
Monitor
Special
I
Monitor I
Cyanide
S
1 5.000
22.000 I
2.318
5.205 I
Limit
Limit
I
Mercury
S
I 0.012
2.400 I
0.038
0.119 I
Limit
Limit
I
Silyir
AL
I `O.0607)
1.230 I
0.000
0.000 I
I
selenium
S
I 5.000
20.000 1
0.000
0.000 I
I
I
Arsenic
S
1 50.000
360.000 I
74.338
89.229 I
Limit
Limit
I
I
Phenols
S
1 0.000
0.000 I
0.000
0.000 I
I

TO%I CS R E V I EW 05/30/91
__________________________
ver 3.
Facility: CITY OF ASHEBORO
NPDES Permit No.: NCO026123
Status (E, P, or M): M
Permitted Flow: 12.00 mod
Actual Average Flow: 4.50 mgd
Subbasin: 30609.00
Receiving Stream: DEEP RIVER
Stream Classification: C
7010: 8.00 efs
IWC: 69.9 4
Standard
Pollutant AL
(ug/1)
Cadmium
Chromium
Copper
Nickel
Lead
Zinc
Cyanide
Mercury
Silver
Selenium
Arsenic
Phenols
Pollutant
Cadmium
Chromium
Copper
Nickel
Lead
Zinc
Cyanide
Mercury
Silver
Selenium
Arsenic
Phenols
S 2.0
S 50.0
AL 7.0
S 88.0
S 25.0
AL 50.0
8 5.0
S 0.012
AL 0.060
S 5.0
S 50.0
S NA
I
I
I
Acute I Removal
Criteria I Eff.
(ug/1) I +
1.79 1 92%
984 I 89%
9.2 I 60%
789 I 39%
34 I 811
65 I 60%
22.0 I 59%
2.4 I 86%
1.2 944
20 80%
360 I 25%
------------
P R E T
R E A T M E
N T D A
T A'--------------- - - ---- EFFLUENT DATA ---
ACTUAL
ACTUAL
PERMITTED I
or
Ind. +
Ind. + I
ACTUAL
ACTUAL
Default
ACTUAL
Domestic
PERMITTED
Domestic I
Maximum
Weekly
Allowable
Domestic
Industrial
Total
Industrial
Total I
Daily
Average
Load
Load
Load
Load
Load
Load I
Value
Value
(4/d)
_________
(4/d)
_________
(4/d)
_________
(4/d)
________
(}/d)
_______
(4/d) I
________
(ug/1)
_________
(ug/1)
_________
2.02
0.06
0.007
0.07
0.12
I
0.177 I
36.68
0.21
0.68
0.09
17.98
18.190 I
6.00
1.41
0.42
1.96
2.38
10.01
10.490 I
71.50
11.64
0.21
0.26
0.47
1.33
1.540 I
7.00
10.62
0.21
0.17
0.38
0.72
0.927 I
6.60
10.09
2.08
2.50
4.58
21.38
23.460 I
190.00
0.98
0.21
0.0024
0.21
0.27
0.477 I
0.01
0.01
0.01
0.0003
0.01
0.02
0.032 I
0.08
2.02
5.38
3.34
0.38
3.72
1.13
4.470 I
I
�..............................
A N A L Y S
I S R E
S U L T Se.o.oe.............o....--�.........e.
I
I
Monitor / Limit / Special Condition*
I
I Allowable
Allowablel
Predicted
Predicted I
I
I Effluent
Effluent I
on ACTUAL
on PERMIT.]
Actual Actual INSTREAM MONITORING I
Bkg
I Conc.
Conc.
Influent
Influent
ACTUAL
PERMITTED
Daily Max. Wk. Avg. I Based on
Based on
Conc.
I CHRONIC
ACUTE
Data
Data I
Influent
Influent
Effluent Effluent I Actual
Actual
(ug/1)
I (ug/1)
________
(ug/1) I
________
(ug/1)
_________
(ug/1) I
________ 1
Loading
________
Loading
___
Data Data I Daily Max.
_______ _________ I -------
Wk. Avg. I
________ 1
S
1 2.860
1
2.560 1
0.143
0.377 1
Monitor
Limit
I
I
S
I 71.505
1407.683 I
2.591
53.256 I
Monitor
Limit
Monitor I
I
AL
I (10.0111
13.186 I
25.338
111.660 I
Monitor
Monitor
Special I
Monitor I
S
125.849
1128.355 I
7.631
25.003 1
Monitor
Limit
Monitor I
I
S
I 35.753
48.309 I
1.942
4.688 I
Monitor
Limit
Limit I
I
AL
I C71.505,
93.014
48.760
249.762 I
Monitor
Monitor
Special I
Monitor I
S
1 7.151
31.462
2.318
5.205
Limit
Limit
I
I
S
1 0.017
3.432 I
0.038
0.119 I
Limit
Limit
I
I
AL
I 0.086
1.759 I
0.000
0.000 I
I
I
S
I 7.151
28.602 I
0.000
0.000 I
I
I
S
I 71.505
514.839 I
74.338
89.229 I
Limit
Limit
I
I
S
I 0.000
0.000 1
0.000
0.000 1
I
I

T 0 X I C S R E V I E W
05/30/91
ver 3.0
Facility: CITY OF ASHEBORO
NPDES Permit No.: NCO026123
Status (E, P, Or M): M
Permitted Flow: 9.00 mgd
Actual Average Flow: 4.50 mgd
Subbasin: 30609.00
Receiving Stream: DEEP RIVER
Stream Classification: C
7QIO: 8.00 cfs
INC: 63.6 t
Standard
Pollutant AL
(ug/1)
Cadmium
Chromium
Copper
Nickel
Lead
Zinc
Cyanide
Mercury
Silver
Selenium
Arsenic
Phenols
Pollutant
Cadmium
Chromium
Copper
Nickel
Lead
Zinc
Cyanide
Mercury
Silver
Selenium
Arsenic
Phenols
S 2.0
S 50.0
AL 7.0
S 88.0
S 25.0
AL 50.0
S 5.0
S 0.012
AL 0.060
S 5.0
S 50.0
S NA
I
I
I
Acute I
Criteria 1
(ug/1) I
1.79 I
984 I
9.2 1
789 I
34 I
65 I
22.0 I
2.4 I
1.2 I
20 1
360 1
Removal
Eff.
8
928
89%
60%
39%
81%
60%
59%
86%
94%
808
25%
------------P
RE T
R E A TM EN
T D A
T A
ACTUAL
ACTUAL
or
Ind. +
Default
ACTUAL
Domestic
PERMITTED
Allowable
Domestic
Industrial
Total
Industrial
Load
Load
Load
Load
Load
(f/d)
(4/d)
(//d)
(4/d)
(4/d)
2.02
0.06
0.007
0.07
0.12
36.68
0.21
0.68
0.89
17.98
1.41
0.42
1.96
2.38
10.07
11.64
0.21
0.26
0.47
1.33
10.62
0.21
0.17
0.38
0.72
10.09
2.08
2.50
4.58
21.38
0.98
0.21
0.0024
0.21
0.27
0.01
0.01
0.0003
0.01
0.02
0.08
2.02
5.38
3.34
0.38
3.72
1.13
m� EFFLUENT DATA �-
PERMITTED I
Ind. + I
ACTUAL
ACTUAL
Domestic I
Maximum
Weekly
Total I
Daily
Average
Load I
Value
Value
(4/d) I
_------ I
(ug/1)
__------
(ug/1)
_________
0.177 I
18.190 I
6.00
10.490 I
71.50
1.540 I
7.00
0.927 I
6.60
23.460 1
190.00
0.477 1
0.01
0.032 1
4.470
--------------------------------
A N A L Y S
I S R E
S U L T S=__________________________________________
I
I
Monitor /
Limit / Special
Condition*
I Allowable
Allowable)
Predicted
Predicted I
I
I Effluent
Effluent I
on ACTUAL
on PERMIT.I
Actual
Actual
INSTREAM MONITORING I
Bkg
I Cone.
Cone. 1
Influent
Influent I
ACTUAL
PERMITTED
Daily Max.
Wk. Avg.
Based on
Based on I
Cone.
I CHRONIC
ACUTE I
Data
Data I
Influent
Influent
Effluent
Effluent
I Actual
Actual I
(ug/1)
I (ug/1)
(ug/1)
(ug/1)
(ug/1) I
Loading
Loading
Data
Data
I Daily Max.
Wk. Avg.
S
_______
I 3.147
________ 1
2.817 I
_________
0.143
________ I
0.377 I
________
Monitor
________
Limit
_________
_________
I ________
I
________ 1
I
S
1 78.674
1548.805 I
2.591
53.256 I
Monitor
Limit
Monitor
I
I
AL
1 (11.014)
14.507 I
25.338
111.6BO I
Monitor
Monitor
Special
I
Monitor I
S
1 138.466
1241.473 I
7.631
25.003 1
Monitor
Limit
Monitor
I
I
S
39.337
53.152 I
1.942
4.688 I
Monitor
Limit
Limit
I
I
AL
I (78.674)
102.339 I
48.760
249.762 I
Monitor
Monitor
Special
Monitor I
S
I 7.867
34.616 1
2.318
5.205 I
Limit
Limit
I
S
I 0.019
3.776 I
0.038
0.119 1
Limit
Limit
I
I
AL
1 0.094
1.935 1
0.000
0.000 1
I
I
S
I 7.867
31.470 I
0.000
0.000 1
1
S
I 78.674
566.452 I
74.338
89.229 I
Limit
Limit
I
I
S
I 0.000
0.000 I
0.000
0.000 I
I
I

BLACK & VEATCH
ENGINEERS - ARCHITECTS TEL [phone]
City of Asheboro
Wastewater Treatment Plant
Department of Environment, Health, and
Natural Resources
Division of Environmental Management
P.O. Box 27687
Raleigh, North Carolina 27611-7687
Attention: Mr. Trevor Clements
Gentlemen:
5540 CENTERVIEW DRIVE, SUITE 114
RALEIGH, NORTH CAROLINA 27606
FAX: [phone]
B&V Project 18051.100
B&V File B
May 16, 1991
RFC�BUED
M AY 2 0 1991
,�1 "G0%1 "UP" i BRANCH
! GIAL.
Black & Veatch has initiated a study to determine expansion needs for
the City of Asheboro's municipal wastewater treatment plant. The
existing plant has a capacity of 6.0 million gallons per day and
discharges to Hasketts Creek (see attached map).
It is anticipated that the wastewater treatment plant will be expanded
to a capacity between 9.0 and 12.0 mgd. Points of discharge to be
considered are (1) the existing discharge point at Hasketts Creek and
(2) to the Deep River discharge point, also shown on the attached map.
Please provide preliminary effluent limits for the two discharge points
being considered at wastewater treatment plant capacities of 9.0 and
12.0 mgd. We are presently preparing a discharge permit application for
these two discharge points.
Thank you for your assistance and cooperation in this matter.
Very truly yours,
BLACK & VEATCH
W. Max Frazier
mbc
Enclosure
cc: Dumont Bunker

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