HomeMy Public PortalAboutExhibit MSD 84L4 - Lemay Wastewater Treatment PlantExhibit MSD 84L4
STATE OF MISSOURI
DEPARTMENT OF NATURAL, RESOURCES
MISSOURI CLEAN WATER COMMISSION
MISSOURI STATE OPERATING PERMIT
In compliance with the Missouri Clean Water Law, (Chapter 644 R.S. Mo. as amended, hereinafter, the Law), and the Federal Water
Pollution Control Act (Public Law 92-500, 92nd Congress) as amended,
Permit No.
Owner:
Address:
Continuing Authority:
Address:
Facility Name:
Address:
Legal Description:
Coordinates:
Receiving Stream:
First Classified Stream and ID:
LSGS Basin & Sub -watershed No.:
MO-0025151
Metropolitan St. Louis Sewer District
2350 Market Street, St. Louis, MO 63103
Same as above
Same as above
MSD, Lemay WWTP
201 Hoffineister Avenue, St. Louis, MO 63125
Land Grant 904, St. Louis County
X=738246, Y=4267463
See page two
See page two
See page two
is authorized to discharge from the facility described herein, in accordance with the effluent limitations and monitoring requirements
as set forth herein:
FACILITY DESCRIPTION
The Lemay Wastewater Treatment Plant is an activated sludge secondary treatment plant consisting of six grit/detritus tanks, five
comminutors, two pre -aeration tanks, eight primary clarifiers with four additional wet weather primary clarifiers, eight step -feed
aeration tanks, twelve final clarifiers, three ash slurry ponds, five stormwater outfalls, and solids handling facilities which include
sludge dewatering belt filter presses, multiple hearth incinerators and landfill of incinerator ash. Service area includes combined
sewers, master pump station with six, 60 MGD pumps.
(continued on page 2)
This permit authorizes only wastewater discharges under the Missouri Clean Water Law and the National Pollutant Discharge
Elimination System; it does not apply to other regulated areas. This permit may be appealed in accordance with Section 644.051,6 of
the Law.
April 1, 2012
Effective Date
March 31.2017
Expiration Date
Sara Parker Pauley, Director, Depart&NatResources
Joras, Director Water Protection Program
FACILITY DESCRIPTION (continued)
Outfall #001 — POTW - SIC =4952 Certified "A" Operator Required
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 904, St. Louis County
X=738246, Y=4267463
Mississippi River (P)
Mississippi River (P) (01707.02)
07140101— 0507
Page 2 of 36
Permit No. MO-0025151
Activated sludge' sludge filter press/sludge incineration/incinerator ash landfill. See Section D, Special Conditions for bypassing
requirements.
Design population equivalent is 1,670,000
Design flow is 167 million gallons per day (MGD). Design primary peak flow is 340 MGD
Actual flow is 135 million gallons per day.
Design sludge production is 73,000 dry tons: year.
Actual sludge production is 34,600 dry tons: year.
Outfall #002 — POTW - SIC #4952
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
Land Grant 904, St. Louis County
X=738157, Y=4267204
Mississippi River (P)
Mississippi River (P) (01707.02)
USGS Basin and Subwatershed: 07140101-0507
Incinerated sludge is discharged to ash slurry ponds. Undisinfected wastewater from the final clarifiers is mixed with the ash to create
slurry for discharge to the ash ponds. Three lagoon cells receive ash and operate in parallel. Incinerator ash is eventually landfilled.
Design flow is 1.8 MGD
Actual flow is 1.4 MGD
Outfall n003 — Storm water runoff
Legal Description: Land Grant 904, St. Louis County
UTM Coordinates: X=738066, Y=4268550
Receiving Stream: Unnamed Tributary to River des Peres
First Classified Stream & ID: River des Peres (P) (1710)
USGS Basin and Subi,vatershed: 07140101-0506
Receives stormwater runoff from the fuel dispenser area, maintenance building, sludge incinerator and filter press area.
Design flow is dependent on rainfall
Outfall #004 — Storm water runoff
Legal Description: Land Grant 904, St. Louis County
UTM Coordinates: X=738101, Y=4268449
Receiving Stream: Unnamed Tributary to River des Peres
First Classified Stream & ID: River des Peres (P) (1710)
USGS Basin and Subwatershed: 07140101-0506
Receives stormwater runoff mainly from roads that lead to the maintenance building, sludge incinerator and filter press area.
Design flow is dependent on rainfall
Page 3 of 36
Permit No. MO-0025151
FACILITY DESCRIPTION (continued)
Outfall #005 — Storm water runoff
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Receives stormwater runoff from the
Design flow is dependent on rainfall
Outfall #006 — Storm water runoff
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Receives stormwater runoff from the
Design flow is dependent on rainfall
Outfall #007 — Storm water runoff
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Receives stormwater runoff from the
Design flow is dependent on rainfall.
Land Grant 904, St. Louis County
X=738078, Y=4268408
Unnamed Tributary to River des Peres
River des Peres (P) (1710)
07140101-0506
trash removal and grit/screening buildings.
Land Grant 904, St. Louis County
X=737948, Y=4268139
Unnamed Tributary to Mississippi River
Mississippi River (P) (01707.02)
07140101— 0507
blowerlthickening building and final clarifiers.
Land Grant 904, St. Louis County
X=737788, Y=4268125
Unnamed Tributary to Mississippi River
Mississippi River (P) (01707.02)
07140101 — 00507
roads that lead to the blower/thickening building and final clarifiers.
PAGE NUMBER 4 of 36
A. EFFLUENT LIMITATIONS AND MONITORLNG REQUIREMENTS
PERMIT NUMBER MO-0025151
The permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this permit. The interim effluent
limitations shall become effective upon issuance and remain in effect until December 31, 2013. Such discharges shall be controlled, Iimited and
monitored by the permittee as specified below:
TERIM EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Oti TFALL NUMBER AND EFFLUENT
PARAMETER(S)
UNITS
DAILY
MAXIMUM
WEEKLY
AVERAGE
MONTHLY
AVERAGE
MEASUREMENT SAMPLE
FREQUENCY TYPE
Outfall #001 - Effluent
Flow
Carbonaceous Biochemical Oxygen
Demand ***
Total Suspended Solids***
pH —Units
Temperature
Oil and Grease
Ammonia Nitrogen as N
(April — September)
(October — March)
E. Coli (Note 1)
MGD
mg/L
mg/L
SU
=F
mg/L
mg/L
lbs/day
mg/L
lb/day
# 100 mL
*
**
*
15
38.8
42,714
77.9
85,759
40
45
*
*
25
30
**
*
10
23.3
25,651
46.6
51;301
*
once day 24 hr. est.
once/weekday 24 hr. comp.
once, weekday 24 hr. comp.
once. weekday grab
once/weekday grab
once/week grab
once/week grab
once/week grab
MONITORING REPORTS SHALL BE SUBMITTED MONTHLY: THE FIRST REPORT IS DUE May 28, 2012 .
Arsenic, Total Recoverable
Cadmium, Total Recoverable
Chromium III, Total Recoverable
Chromium VI, Dissolved
Copper, Total Recoverable
Lead, Total Recoverable
Mercury, Total Recoverable
Nickel, Total Recoverable
Silver, Total Recoverable
Zinc, Total Recoverable
Cyanide, Amenable to Chlorination (Note
3)
Chemical Oxygen Demand
Total Phosphorus as P
Nitrite & Nitrate
Total Nitrogen as N
Ina-
µg`L
µg L
µgL
µg/L
µg/L
µg/L
µg.L
Aga-
µg/L
µg/L
mg/L
mg/L
mg/L
mg/L
*
7.8
*
*
*
*
*
*
21.5
*
39.1
*
*
*
*
*
2.7
*
*
*
*
*
*
7.4
*
12.6
16ML
*
*
*
once/quarter ***** 24 hr. comp.
once/quarter ***'* 24 hr. comp.
once quarter ***** 24 hr. comp.
once/quarter ***** grab
onceiquarter ***** 24 hr. comp.
once/quarter ***** 24 hr. comp.
once/quarter ***** 24 hr. comp.
once/quarter ***** 24 hr. comp.
once/quarter ***** 24 hr. comp.
once.quarter ***** 24 hr. comp.
once/quarter ***** grab
once/quarter ***** 24 hr. comp.
once/quarter ***** 24 hr. comp.
once/quarter ***** 24 hr. comp.
once/quarter ***** 24 hr. comp.
MONITORING REPORTS SHALL BE SLBMII"IED
OU_MRTERLY; THE FIRST REPORT IS DUE July 28, 2012. THERE SHALL BE NO
DISCHARGE OF FLOATING SOLIDS OR VISIBLE
FOAM IN OTHER THAN TRACE AMOUNTS.
B. STANDARD CONDITIONS
LN ADDITION TO SPECIFIED CONDITIONS STATED HERELN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I. II & m STANDARD CONDITIONS
DATED October I. 1980 and August i5. 1994 AND HEREBY INCORPORATED AS THOUGH FULLY SET FORTH HERELN.
PAGE NUMBER 5 of 36
A. FFFLUTENT iIMITATIONS AND MONITORING $FOhJIREMRNTS
PERMIT NUMBER MO-0025151
The permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this permit. The interim effluent
limitations shall become effective upon issuance and remain in effect until December 31, 2013. Such discharges shall be controlled, limited and
monitored by the permittee as specked below:
OUTFALL NUMBER AND EFFLUENT
PARAMETER(S)
UNITS
INTERIM EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
DAILY
MAXIMUM
WEEKLY
AVERAGE
MONTHLY
AVERAGE
MEASUREMENT
FREQUENCY
SAMPLE
TYPE
Outfall #002
Flow
Biochemical Oxygen Demand
Total Suspended Solids
pH — Units
Temperature
Oil and Grease
Ammonia Nitrogen as N
(April — September)
(October — March)
E. Coli (Note 1)
MGD
mg/L
mg/L
SU
OF
mg/L
mg/L
lbs/day
mg/L
lb/day
#/100 mL
*
*
15
*
45
90
*
30
65
*
10
*
once/week 24 hr. est.
once/week grab
once/week grab
once/week grab
once/week grab
once/month grab
once/month grab
once/week grab
MONITORING REPORTS SHALL BE SUBMITTED MONTHLY; THE FIRST REPORT IS DUE May 28.2012.
Arsenic, Total Recoverable
Cadmium, Total Recoverable
Chromium III, Total Recoverable
Chromium VI, Dissolved
Copper, Total Recoverable
Lead, Total Recoverable
Mercury, Total Recoverable
Nickel, Total Recoverable
Silver, Total Recoverable
Zinc, Total Recoverable
Cyanide, Amenable to Chlorination
Chemical Oxygen Demand
Total Phosphorus as P
Nitrite & Nitrate
Total Nitrogen as N
Aga,
Aga -
AWL
Ft
pga-
µ
mg/L
mg/L
mg/L
mg/L
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter * ** * * grab
once/quarter ***** grab
MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY; THE FIRST REPORT IS DUE Julv 28.2012. THERE SHALL BE NO
DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
B. STANDARD CONDITIONS
IN ADDITION TO SPECIFIED CONDITIONS STATED HEREIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I. Lain STANDARD CONDITIONS
DATED October 1. 1980 and August 15. 1994 AND HEREBY INCORPORATED AS THOUGH FULLY SET FORTH HEREIN.
A. EFFLUENT LLYIITATIONS AND MONTTORLNG REQUIREMENTS (continued)
* Monitoring requirement only.
**
***
****
Note 1 --
Note 2 —
Note 3 --
pH is measured in pH units and is not to be averaged. The pH is limited to the range of 6.5 -9.0 pH units.
This facility is required to meet a removal efficiency of 85% or more. If the permittee can document an alternate removal
efficiency during wet weather, then that removal efficiency can be considered for wet weather flows.
pH is measured in pH units and is not to be averaged. The pH is to be maintained at or above 6.5 pH units.
Once per quarter —see table below for sample months.
Final Iimitations and monitoring requirements for E. Coli are applicable only during the recreational season from April 1
through October 31. The Monthly Average Limit for E. Coli is expressed as a geometric mean.
See Total Toxic Organics page.
This effluent limit is below the minimum quantification level (ML) of the most common and practical EPA approved
methods. The department has determined the current acceptable ML for Cyanide amenable to Chlorination to be 16 µe,
when using the Cyanide by Automated Colorimetric Method #335.3 from the U.S.EPA National Exposure Research
Laboratory. The permittee will conduct analyses in accordance with this method, or equivalent, and report actual
analytical values. Measured values greater than or equal to the minimum quantification level of 16 lie. will be
considered violations of the permit and values less than the minimum quantification level of 16 µg/L will be considered to
be in compliance with the permit limitation. The minimum quantification level does not authorize the discharge of
Cyanide in excess of the effluent limits stated in the permit.
Sample discharge at least once for the months of:
Report is due:
April 28
July 28
October 28
January 28
January, February, March (1st Quarter)
April, May, June (2nd Quarter)
July, August, September (3rd Quarter)
October, November, December (4th Quarter)
PAGE NUMBER 7 of 36
A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
The permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this permit. The final effluent
limitations shall become effective after December 31, 2013, and remain in effect until expiration of the permit. Such discharges shall be controlled,
PERMIT NUMBER MO-0025151
OUTFALL NUMBER AND EFFLUENT
PARAMETERS)
U
UNITS
FINAL EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
DAILY
MAXIMUM
WEEKLY
AVERAGE
MONTHLY
AVERAGE
- MEASUREMENT SAMPLE
FREQUENCY TYPE
Outfall #001 - Effluent
Flow
MGD
*
*
once/day 24 hr. est.
Carbonaeous Biochemical Oxygen
mg/L
40
25
once/weekday 24 hr. comp.
Demand* * *
Total Suspended Solids***
mg/L
45
30
once/weekday 24 hr. comp.
pH — Units
SU
* *
* *
once/weekday grab
Temperature
°F
*
*
once/weekday grab
Oil and Grease
mg/L
15
10
once/week grab
Ammonia Nitrogen as N
mg/L
38.8
23.3
once/week grab
(April — September)
lbs/day
42,714
25,651
(October — March)
mg/L
77.9
46.6
lb/day
85,759
51,301
E. Coli (Note 1)
#/100 mL
1134
oncelweek grab
Total Residual Chlorine (Note 4)
mg/L
0.077
0.038
once/weekday grab
, 0.13 ML
0.13 ML
MONITORING REPORTS SHALL BE SUBMITTED MONTHLY; THE FIRST REPORT IS DUE February 28. 2013.
Arsenic, Total Recoverable
Cadmium, Total Recoverable
Chromium III, Total Recoverable
Chromium VI, Dissolved
Copper, Total Recoverable
Lead, Total Recoverable
Mercury, Total Recoverable
Nickel, Total Recoverable
Silver, Total Recoverable
Zinc, Total Recoverable
Cyanide, Amenable to Chlorination (Note3)
Chemical Oxygen Demand
Total Phosphorus as P
Nitrite & Nitrate
Total Nitrogen as N
Aga -
AWL
µJD
p
its
Lsi
mg/L
mg/L
mg/L
mg/L
*
7.8
*
*
*
*
*
*
21.5
*
39.1
*
*
*
*
*
2.7
*
*
*
*
*
*
7.4
12.6
(16 ML)
*
*
*
*
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter*****
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter*****
once/quarter *****
once/quarter *****
24 hr. comp.
24 hr. comp.
24 hr. comp.
grab
24 hr. comp.
24 hr. comp.
24 hr. comp.
24 hr. comp.
24 hr. comp.
24 hr. comp.
grab
24 hr. comp.
24 hr. comp.
24 hr. comp.
24 hr. comp.
MONITORING REPORTS SHALL BE SUBMITTED OUARTERLY; THE FIRST REPORT IS DUE Aori128. 2013. THERE SHALL BE NO DISCHARGE
OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
B. STANDARD CONDITIONS
IN ADDITION TO SPECIFIED CONDITIONS STATED HEREIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts L II & III STANDARD
CONDITIONS DATED Qctober 1. 1980 and August 15. 1994, AND HEREBY INCORPORATED AS THOUGH FULLY SET FORTH HEREIN.
A. EFFLUENT LIMITATIONS AND _1 LONITORE\G REQUIREMENTS
PAGE NUMBER 8 of 36
PERMIT .NUMBERN10-0025151
The permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this permit. The fmal effluent
limitations shall become effective after December 31, 2013, and remain in effect until expiration of the permit. Such discharges shall be controlled,
Limited and monitored by the permittee as specified below:
OUTFALLNUMBER AND EFFLUENT
PARAMETER(S)
UNITS
FINAL EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
DAILY
MAXIMUM
WEEKLY
AVERAGE
MONTHLY
AVERAGE
MEASUREMENT SAMPLE
FREQUENCY TYPE
Outfall #002- Ash Pond
MGD
mg/L
mgl.
SE
"~F
mg/L
mg/L
lb iday
mg/L
lb/day
#I100 mL
me,
*
****
*
15
*
*
5.4
45
90
*
*
30
65
****
*
10
*
*
1134
2.7
onceiweek 24 hr. est.
onceiweek grab
once/week grab
onceiweek grab
onceiweek grab
once/month grab
once month grab
once/week grab
once/week grab
Flow
Biochemical Oxygen Demand
Total Suspended Solids
pH--L'nits
Temperature
Oil and Grease
Ammonia Nitrogen as X
(April — September)
(October — March)
E. Coli (Note 1)
Total Residual Chlorine (Note 5)
MONITORING REPORTS SHALL BE SUBMITTED
MONTHLY THE
FIRST REPORT
IS DUE February 2S, 2014.
Arsenic, Total Recoverable
Cadmium, Total Recoverable
Chromium III, Total Recoverable
Chromium VI, Dissolved
Copper, Total Recoverable
Lead, Total Recoverable
Mercury, Total Recoverable
Nickel, Total Recoverable
Silver, Total Recoverable
Zinc, Total Recoverable
Cyanide, Amenable to Chlorination
Chemical Oxygen Demand
Total Phosphorus as P
Nitrite & Nitrate
Total Nitrogen as N
µg/L
ug/L,
µg/L
µg/L
µg.L
µg/L
µg/L
µg/L
µg/L
µg/L
µg.L
mg/L
mg,L
mg/L
mg
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
once/quarter * * ** * grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once:quarter ***** grab
once/quarter * * * * * grab
once. quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter ***** grab
once/quarter * * * * * grab
once/quarter ***** grab
MONITORING REPORTS SHALL BE SUBMITTED
DISCHARGE OF FLOATING SOLIDS OR VISIBLE
QUARTERLY; THE. FIRST
REPORT
TRACE
IS DUE Aari128, 2014. THERE SHALL BEN O
FOAM IN OTHER THAN
AMOUNTS.
B. STANDARD CONDITIONS
IN ADDITION TO SPECIFIED CONDITIONS STATED
DATED Qgtober 1. 1980 an August 15, 1994, AND
HERELNT, THIS PERMIT IS SUBJECT TO THE ATTACHED
HEREBY LNCORPORATED AS THOUGH FULLY SET FORTH
Parts I. II & III STANDARD CONDITIONS
HEREIN.
PAGE NUMBER 9 of 36
A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
The permittee is authorized to discharge from outfall(s) with serial numbers) as specified in the application for this permit. The final effluent
limitations shall become effective upon issuance of this permit and remain in effect until expiration of the permit. Such discharges shall be
controlled, limited and monitored by the permittee as specified below:
OUTFALL NUMBER AND EFFLUENT
PARAMETERS)
Outfall #001- Effluent
Whole Effluent Toxicity
(WET) Test (AEC - 22.8%)
UNITS
% Survival
FINAL EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
DAILY
MAXIMUM
WEEKLY
AVERAGE
MONTHLY
AVERAGE
See Special Condition #20
MEASUREMENT SAMPLE
TYPE
FREQUENCY
twice/year in 24 hr.
January & July composite
MONITORING REPORTS SHALL BE SUBMITTED SEMI-ANNUALLY; THE FIRST REPORT IS DUE October 28, 2012.
Outfall #002 — Ash Pond
Whole Effluent Toxicity
(WET) Test (AEC - 10%)
% Survival
See Special Condition #20
Once/year in grab
January
MONITORING REPORTS SHALL BE SUBMITTED ANNUALLY. THE FIRST REPORT IS DUE Avri128, 2013.
Outfalls #001 & #002
Total Toxic Organics
(Note 2)
*
once/year
in July
MONITORING REPORTS SHALL BE SUBMITTED ANNUALLY; THE FIRST REPORT IS DUE August 28.2012.
Outfalls #003 - #007- Stormwater
Flow
Precipitation
Biochemical Oxygen Demands
Total Suspended Solids
pH — Units
Oil & Grease
Settleable Solids
MGD
inches
mg/L
mg/L
SU
mg/L
mL/L/hr
*
*
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter *****
once/quarter *****
grab
instantaneous
estimate
total
grab
grab
grab
grab
grab
MONITORING REPORTS SHALL BE SUBMITTED OUARTI
DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN
B. STANDARD CONDITIONS
RLY; THE
OTHER THAN
FIRST REPORT IS DUE July 28.2012. THERE SHALL BE NO
TRACE AMOUNTS.
IN ADDITION TO SPECIFIED CONDITIONS STATED HEREIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I. II & 1TI
STANDARD CONDITIONS DATED October 1, 1980 and August 15. 1994, AND HEREBY INCORPORATED AS THOUGH FULLY SET
FORTH HEREIN.
MO 780010 (Bail
A. EFFLUENT LIMITATIONS AND MONITORING REOUIREMENTS (continued)
* Monitoring requirement only.
pH is measured in pH units and is not to be averaged. The pH is limited to the range of 6.5 -9.0 pH units.
This facility is required to meet a removal efficiency of 85% or more. If the permittee can document an alternate removal
efficiency during wet weather, then that removal efficiency can be considered for wet weather flows.
pH is measured in pH units and is not to be averaged. The pH is to be maintained at or above 6.5 pH units.
* * ** * Once per quarter —see table below for sample months.
Note 1 -- Final limitations and monitoring requirements for E. Colt are applicable only during the recreational season from April 1
through October 31. The Monthly Average Limit for E. Coli is expressed as a geometric mean.
Note 2 — See Total Toxic Organics page.
**
***
* * * *
PERMIT NUMBER MO-0025151
Page 10 of 36
Permit No. MO-0025151
A. EFFLUENT LIMITATIONS AND MONITORLNG REOLIREMENTS (continued)
Note 3 - This effluent limit is below the minimum quantification level (ML) of the most common and practical EPA approved
methods. The department has determined the current acceptable ML for Cyanide amenable to Chlorination to be 16 µg/L
when using the Cyanide by Automated CoIorimetric Method #335.3 from the U.S.EPA National Exposure Research
Laboratory. The permittee will conduct analyses in accordance with this method, or equivalent, and report actual analytical
values. Measured values greater than or equal to the minimum quantification level of 16 µg.'L will be considered violations
of the permit and values less than the minimum quantification level of 16 µggL will be considered to be in compliance with
the permit limitation. The minimum quantification level does not authorize the discharge of Cyanide in excess of the effluent
limits stated in the permit.
Note 4 - This permit contains a Total Residual Chlorine (TRC) limit.
(a) This effluent limit is below the minimum quantification level (ML) of the most common and practical EPA approved CLTRC
methods. The department has determined the current acceptable ML for total residual chlorine to be 0.13 mg.T. when using
the DPD Colorimetric Method #4500 — CL G. from Standard Methods for the Examination of Waters and Wastewater. The
permittee will conduct analyses in accordance with this method, or equivalent, and report actual analytical values. Measured
values greater than or equal to the minimum quantification level of 0.13 mg/L will be considered violations of the permit and
values less than the minimum quantification level of 0.13 mg L will be considered to be in compliance with the permit
limitation. The minimum quantification level does not authorize the discharge of chlorine in excess of the effluent limits
stated in the permit.
(b) Disinfection is required year-round unless the permit specifically states that "Final limitations and monitoring requirements
for E. Coli are applicable only during the recreational season from April 1 through October 31." If your permit does not
require disinfection during the non -recreational months. do not chlorinate in those months.
(c) Do not chemically dechlorirate if it is not needed to meet the limits in your permit.
(d) If no chlorine was used in a given sampling period, an actual analysis is not necessary. Simply report as "0 mg L" TRC.
Note 5 - This permit contains a Total Residual Chlorine (TRC) Iimit.
(a) Disinfection is required year-round unless the permit specifically states that "Final limitations and monitoring requirements
for Fecal Coliform are applicable only during the recreational season from April 1 through October 31." If your permit does
not require disinfection during the non -recreational months, do not chlorinate in those months
(b) Do not chemically dechlorinate if it is not needed to meet the limits in your permit.
(c) If no chlorine was used in a given sampling period, an actual analysis is not necessary. Simply report as "0 mg/L" TRC.
Sample discharge at least once for the months of:
January, February, March (1st Quarter)
April, May, June (2nd Quarter)
July, August, September (3rd Quarter)
October, November, December (4th Quarter)
Report is due:
April 28
July 28
October 28
January 28
C. INFLUENT MONITORING REQUIREMENTS
PAGE NUMBER 11 of 36
PERMIT NUMBER MO-0025151
The facility is required to meet a removal efficiency of 85 % or more for dry weather flows. The monitoring requirements shall become effective
upon issuance and remain in effect until expiration of the permit. To determine removal efficiencies, the influent wastewater shall be monitored by
the permittee as specified below:
SAMPLING LOCATIONS AND
PARAMETERS
O11TFALL #00I — INFLUENT
Carbonaceous Biochemical oxygen
Demands
Total Suspended Solids
UNITS
mg/L
mg/L
MONITORING REQUIREMENTS
MEASUREMENT FREQUENCY
once/week***
once/week***
MONITORING REPORTS SHALL BE SUBMITTED MONTHLY; THE FIRST REPORT IS DUE Mav 2$. 2012.
*w*
SAMPLE TYPE
composite****
composite* * **
This facility is required to meet a removal efficiency of 85% or more. If the permittee can document an alternate removal
efficiency during wet weather, then that removal efficiency can be considered for wet weather flows
A composite sample made up from a minimum of four grab samples collected within a 24 hour period with a minimum of 2 hours
between each grab sample.
Page 12 of 36
Permit No. MO-0025151
D. SPECIAL CONDITIONS
1. This permit may be reopened and modified, or alternatively revoked and reissued, to:
(a) Comply with any applicable effluent standard or limitation issued or approved under Sections 301(b)(2)(C) and (D),
304(b)(2), and 307(a) (2) of the Clean Water Act, if the effluent standard or limitation so issued or approved:
(1) contains different conditions or is otherwise more stringent than any effluent limitation in the permit; or
(2) controls any pollutant not limited in the permit.
(b) Incorporate new or modified effluent limitations or other conditions, if the result of a waste load allocation study,
toxicity test or other information indicates changes are necessary to assure compliance with Missouri's Water Quality
Standards.
(c) Incorporate new or modified effluent limitations or other conditions if, as the result of a watershed analysis, a Total
Maximum Daily Load (TMDL) limitation is developed for the receiving waters which are currently included in
Missouri's list of waters of the state not fully achieving the state's water quality standards, also called the 303(d) list.
The permit as modified or reissued under this paragraph shall also contain any other requirements of the Clean Water Act then
applicable.
2. All outfalls must be clearly marked in the field.
3. Report as no -discharge when a discharge does not occur during the report period.
4. Changes in Discharges of Toxic Substances
The permittee shall notify the Director as soon as it knows or has reason to believe:
(a) That any activity has occurred or will occur which would result in the discharge of any toxic pollutant which is not
limited in the permit, if that discharge will exceed the highest of the following "notification levels:"
(1) One hundred micrograms per liter (100 µgL);
(2) Two hundred micrograms per Iiter (200 ug.L) for acrolein and acrylonitrile; five hundred micrograms per liter
(500 µg. L) for 2,5 dinitrophenol and for 2-methyl-4, 6-dinitrophenol; and one milligram per liter (1 mg/L) for
antimony;
(3) Five (5) times the maximum concentration value reported for the pollutant in the permit application;
(4) The level established in Part A of the permit by the Director.
(b) That they have begun or expect to begin to use or manufacture as an intermediate or final product or byproduct any toxic
pollutant, which was not reported in the permit application.
(c) That the effluent limit established in part A of the permit will be exceeded.
5. Water Quality Standards
(a) Discharges to waters of the state shall not cause a violation of water quality standards rule under 10 CSR 20-7.031,
including both specific and general criteria.
(b) General Criteria. The following general water quality criteria shall be applicable to all waters of the state at all times
including mixing zones. No water contaminant, by itself or in combination with other substances, shall prevent the
waters of the state from meeting the following conditions:
(1) Waters shall be free from substances in sufficient amounts to cause the formation of putrescent, unsightly or
harmful bottom deposits or prevent full maintenance of beneficial uses;
(2) Waters shall be free from oil, scum and floating debris in sufficient amounts to be unsightly or prevent full
maintenance of beneficial uses;
(3) Waters shall be free from substances in sufficient amounts to cause unsightly color or turbidity, offensive odor or
prevent full maintenance of beneficial uses;
(4) Waters shall be free from substances or conditions in sufficient amounts to result in toxicity to human, animal or
aquatic life;
(5) There shall be no significant human health hazard from incidental contact with the water;
(6) There shall be no acute toxicity to livestock or wildlife watering;
Page 13 of 36
Permit No. MO-0025151
D. SPECIAL CONDITIONS (continued)
5. Water °uality Standards (continued)
Waters shall be free from physical, chemical or hydrologic changes that would impair the natural biological
community;
Waters shall be free from used tires, car bodies, appliances, demolition debris, used vehicles or equipment and
solid waste as defined in Missouri's Solid Waste Law, section 260.200, RSMo, except as the use of such materials
is specifically permitted pursuant to section 260.200-260.247.
6. Permittee shall implement and enforce its approved pretreatment program in accordance with the requirements of 40 CFR Part
403. The approved pretreatment program is hereby incorporated by reference.
Permittee shall submit to the Department on or before September 30 of each year a report briefly describing its pretreatment
activities during the previous calendar year. At a minimum, the report shall include the following:
(a) An updated list of the Permittee's Industrial Users, including their names and addresses, or a list of deletions and
additions keyed to a previously submitted list. The Permittee shall provide a brief explanation of each deletion. This list
shall identify which Industrial Users are subject to categorical pretreatment Standards and specify which Standards are
applicable to each Industrial User. The list shall indicate which Industrial Users are subject to local standards that are
more stringent than the categorical Pretreatment Standards. The Permittee shall also list the Industrial Users that are
subject only to local Requirements;
(b) A summary of the status of Industrial User compliance over the reporting period;
(c) A summary of compliance and enforcement activities (including inspections) conducted by the Permittee during the
reporting period; and
(d) Any other relevant information requested by the Department.
7. As required in 40 CFK 122.21 (jX4) the permittee shall, as part of its renewal application for this permit, submit to the
department a written technical evaluation of the need to revise local limits under 40 CFR 403.5 (c)(1).
8. The permittee shall develop and implement a Storm Water Pollution Prevention Plan (SWPPP). The SWPPP must be kept on -
site and should not be sent to DNR unless specifically requested. The permittee shall select, install, use, operate, and maintain
the Best Management Practices prescribed in the SWPPP in accordance with the concepts and methods described in the
following document: Sgorm Water Management For Industrial Activities. Developing Pollution Prevention Plans and Best
Management Practices, (Document number EPA 832-R 92-006) published by the United States Environmental Protection
Agency (USEPA) in September 1992.
(7)
(8)
The SWPPP must include the following:
(a) An assessment of all storm water discharges associated with the facility. This must include a list of potential
contaminants and an annual estimate of amounts that will be used in the described activities.
(b) A listing of specific Best Management Practices (BMPs) and a narrative explaining how BMPs will be implemented to
control and minimize the amount of potential contaminants that may enter storm water.
(c) The SWPPP must include a schedule for a bi-monthly site inspection and a brief written report. The inspections must
include observation and evaluation of BMP effectiveness, deficiencies, and corrective measures that will be taken.
Deficiencies must be corrected within seven days. Inspection reports must be kept on site with the SWPPP. These must
be made available to DNR personnel upon request.
(d) A provision for designating an individual to be responsible for environmental matters.
(e) A provision for providing training to all personnel involved in material handling and storage, and housekeepingof
maintenance and cleaning areas. Proof of training shall be submitted on request of DNR.
9. All paint, solvents, petroleum products and petroleum waste products (except fuels), and storage containers (such as drums,
cans, or cartons) shall be stored so that these materials are not exposed to storm water. Spill prevention, control, and/or
management shall be provided sufficient to prevent any spills of these pollutants from entering a water of the state. Any
containment system used to implement this requirement shall be constructed of materials compatible with the substances
contained and shall also prevent the contamination of groundwater.
10. Good housekeeping practices shall be maintained on the site to keep solid waste from entry into waters of the state.
11. All fueling facilities present on the site shall adhere to applicable federal and state regulations concerning underground storage,
above ground storage, and dispensers, including spill prevention, control and counter measures.
D. SPECIAL CONDITIONS (continued)
Page 14 of 36
Permit No. MO-0025151
12. Substances, regulated by federal law under the Resource Conservation and Recovery Act (RCRA) and Comprehensive
Environmental Response, Compensation, and Liability Act (CERCLA), that are transported, stored, or used for maintenance,
cleaning or repair, shall be managed according to RCRA and CERCLA.
13. The permittee shall comply with any applicable requirements listed in 10 CSR 20-9, unless the facility has received written
notification that the Department has approved a modification to the requirements. The monitoring frequencies contained in this
permit shall not be construed by the permittee as a modification of the monitoring frequencies listed in 10 CSR 20-9. If a
modification of the monitoring frequencies listed in 10 CSR 20-9 is needed, the permittee shall submit a written request to the
department for review and, if deemed necessary, approval.
14. Sewer Extension Authority
(a) The Department has approved the Sewer Extension Program for MSD to regulate and approve construction of sanitary
sewers that are tributary to this wastewater treatment plant.
(b) The approval of the Sewer Extension Program may be modified or revoked by the Department if the sewage collection,
transportation, and receiving treatment facility reach their respective design capacity, or if the Department determines
that this program is causing or contributing to chronic non-compliance of the receiving treatment facility, or if the
permittee fails to follow the terms and conditions of the submitted and approved program.
(c) The Sewer Extension Program Special Condition may be reopened and modified and reissued, or alternatively revoked
to incorporate new or modified conditions to the sewer construction permit authority, if information or regulation or
statute indicates changes are necessary to assure compliance with Missouri's Clean Water Law and associated
regulations.
(d) If item b or item c of the Sewer Extension Program occurs, the permittee will be notified to any modification to this
operating permit.
(e) The Permittee, as part of their Sewer Extension Program, shall submit an annual report January 286 of each year, to the
Missouri Department of Natural Resources' St. Louis Regional Office. The report must provide the following: 1) list of
the name of the projects approved, and 2) the length of sewers and force mains and the capacity of lift stations
constructed under the sewer extension program. A summary of total flow at the treatment facility shall be included.
Detailed project information and data including design flows and inspection records shall be available for review upon
request.
(f) The Sewer Extension Authority, is valid the length of this operating permit. Upon renewal of the permit, the Sewer
Extension Authority for MSD- St. Louis will be reevaluated.
Page 15 of 36
Permit No. MO-0025151
D SPECIAL CONDITIONS (continued)
15. Nine Minimum Controls:
The permittee will implement the Nine Minimum Controls as specified by the U.S. EPA Combined Sewer Overflow (CSO)
Policy dated April 19,1994, (59 FR 18688):
Control 1— Proper Operation and Maintenance Programs;
Control 2 — Maximum Use of the Collection System for Storage;
Control 3 — Review and Modification of Pretreatment Requirements;
Control 4 — Maximization of Flow to the POTW for Treatment;
The federal Consent Decree No. 4:07-CV-1120(CEJ) has been lodged with the court on August 4, 2011. The permittee shall
increase secondary treatment capacity pursuant to Appendix D of the Consent Decree. The permittee shall subsequently
conduct stress testing to confirm the peak wet -weather flow capacities of the treatment facilities pursuant to Appendix E of the
Consent Decree.
Control 5 —Dry Weather Flows from CSOs are prohibited;
Control 6 — Control of Solid and Floatable Materials in CSOs;
Control 7 — Pollution Prevention;
Control 8 — Public Notification;
Control 9 — Monitoring to Effectively Characterize CSO Impacts and the Efficacy of CSO Controls.
The permittee shall submit annual reports to document the implementation of the nine minimum controls. The reports will be
due October 31' of each year.
16. The permittee is authorized to discharge from the Combined Sewer Overflow (CSO) locations identified in Attachment A.
New outfalls may be added by the permittee by applying for modification of the permit.
17. Any influent flows less than the facility's secondary treatment capacity that are diverted from secondary treatment are not
authorized and are subject to the provisions of 40 CFR §122.41(m).
18. All final effluent samples from Outfall #001 must be taken at a point downstream of where primary effluent that bypasses
secondary treatment is mixed with secondary effluent. All influent flows must receive primary treatment and meet the
appropriate permit limitations.
19. The permittee shall report any substantial changes in volume or character of pollutants being introduced to the POTW. The
authorization to bypass may be modified or terminated when there is substantial change in volume or character of pollutant
being introduced to the POTW.
D. SPECLAL CONDITIONS (continued)
20. Whole Effluent Toxicity (WET) tests shall be conducted as follows:
OLTTFALL
001
LC50 = AEC 0.3.
AEC
22.8%
Page 16 of 36
Permit No. MO-0025151
SUMMARY OF ACUTE WET TESTING FOR THIS PERMIT
LC50%*
76%
FREQUENCY
Twice/year
SAMPLE TYPE
24 hr composite
MONTH
January & July
91.2% 0 45.6%
22.8%
Dilution Series
a 7% I (Control) 100% upstream, if + (Control) 100% Lab Water,
available , also called synthetic water
SUMMARY OF ACUTE WET TESTING FOR THIS PERMIT
OUTFALL AEC LC50%* FREQUENCY SAMPLE TYPE MONTH
002 10% 33% Once.ear Grab January
* LC50 = AEC / 0.3.
40% I 20%
10%
Dilution Series
(Control) 100% upstream, if I (Control) 100% Lab Water,
available i also called synthetic water
(a) Test Schedule and Follow -Up Requirements
(1) Perform a MULTIPLE -dilution acute \VET test in the months and at the frequency specified above. For tests
which are successfully passed, submit test results using the Department's WET test report form #MO-780-1899
along with complete copies of the test reports as received from the laboratory, including copies of chain -of -
custody forms within 30 calendar days of availability to the WATER PROTECTION PROGRAM, P.O. Box 176,
Jefferson City, MO 65102. If the effluent passes the test, do not repeat the test until the next test period.
(a) For discharges of stormwater, samples shall be collected within three hours from when discharge first
occurs.
(b) Samples submitted for analysis of stormwater discharges shall be collected as a grab.
(c) For discharges of non-stormwater, samples shall be collected only when precipitation has not occurred for a
period of forty-eight hours prior to sample collection. In no event shall sample collection occur
simultaneously with the occurrence of precipitation excepting for stormwater samples.
(d) A twenty-four hour composite sample shall be submitted for analysis of non-stormwater discharges.
(e) Upstream receiving water samples, where required, shall be collected upstream from any influence of the
effluent where downstream flow is clearly evident.
(f) Samples submitted for analysis of upstream receiving water may be collected as either a grab or twenty-
four -hour composite as appropriate to the nature of the discharge.
(g) Chemical and physical analysis of the upstream control and effluent sample shall occur immediately upon
being received by the laboratory-, prior to any manipulation of the effluent sample beyond preservation
methods consistent with federal guidelines for WET testing that are required to stabilize the sample during
shipping.
(h) Any and all chemical or physical analysis of the effluent sample performed in conjunction with the WET
test shall be performed at the 100% Effluent concentration in addition to analyses performed upon any
(i) other effluent concentration.
(j) All chemical analyses included in the Missouri Department of Natural Resources WET test report form
#MO-780-1899 shall be performed and results shall be recorded in the appropriate field of the report form.
(k) Where flow -weighted composite sample is required for analysis, the samples shall be composited at the
laboratory where the test is to be performed.
Page 17of36
Permit No. MO-0025151
D. SPECIAL CONDITIONS (continued)
20. Whole Effluent Toxicity (WET) tests shall be conducted as follows: (continued)
(1) Where in stream testing is required downstream from the discharge, sample collection shall occur
immediately below the established Zone of Initial Dilution in conjunction with or immediately following a
release or discharge.
(m) Samples submitted for analysis of downstream receiving water may be collected as either a grab or twenty-
four -hour composite as appropriate to the nature of the discharge.
(n) All instream samples, including downstream samples, shall be tested for toxicity at the 100% concentration
in addition to any other assigned AEC for in -stream samples.
(2) All failing test results along with complete copies of the test reports as received from the laboratory, INCLUDING
THOSE TESTS CONDUCTED UNDER CONDITION (3) BELOW, shall be reported to the WATER
PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the availability
of the results.
(3) If the effluent fails the test, a multiple dilution test shall be performed for BOTH test species within 30 calendar
days and biweekly thereafter (for storm water, tests shall be performed on the next and subsequent storm water
discharges as they occur, but not less than 7 days apart) until one of the following conditions are met:
(a) THREE CONSECUTIVE MULTIPLE -DILUTION TESTS PASS. No further tests need to be performed
until next regularly scheduled test period.
(b) A TOTAL OF THREE MULTIPLE -DILUTION TESTS FAIL.
(4) The permittee shall submit a summary of all test results for the test series along with complete copies of the test
reports as received from the laboratory to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City,
MO 65102 within 14 calendar days of the third failed test.
(5) Additionally, the following shall apply upon failure of the third MULTIPLE DILUTION test: A toxicity
identification evaluation (TIE) or toxicity reduction evaluation (TRE) is automatically triggered. The permittee
shall contact THE WATER PROTECTION PROGRAM within 14 calendar days from availability of the test
results to ascertain as to whether a TIE or TRE is appropriate. The permittee shall submit a plan for conducting a
TIE or TRE to the WATER PROTECTION PROGRAM within 60 calendar days of the date of DNR's direction to
perform either a TIE or TRE. This plan must be approved by DNR before the TIE or TRE is begun. A schedule
for completing the TIE or TRE shall be established in the plan approval.
(6) Upon DNR's approval, the TIE/TRE schedule may be modified if toxicity is intermittent during the TIE/TRE
investigations. A revised WET test schedule may be established by DNR for this period.
(7) If a previously completed TIE has clearly identified the cause of toxicity, additional TIES will not be required as
long as effluent characteristics remain essentially unchanged and the permittee is proceeding according to a DNR
approved schedule to complete a TRE and reduce toxicity. Regularly scheduled WET testing as required in the
permit, without the follow-up requirements, will be required during this period.
PASS/FAIL procedure and effluent limitations:
(1) To pass a multiple -dilution test:
(a) For facilities with a computed percent effluent at the edge of the zone of initial dilution, Allowable Effluent
Concentration (AEC) OF 30% OR LESS, the AEC must be less than three -tenths (0.3) of the LCso
concentration for the most sensitive of the test organisms; OR,
(b) For facilities with an AEC greater than 30%, the LC50 concentration must be greater than 100%; AND,
(c) All effluent concentrations equal to or less than the AEC must be nontoxic. Mortality observed in all
effluent concentrations equal to or less than the AEC shall not be significantly different (at the 95%
confidence level; p = 0.05) than that observed in the upstream receiving -water control sample. Where
upstream receiving water is not available mortality observed in the AEC test concentration shall not be
significantly different (at the 95% confidence level; p = 0.05) than that observed in the laboratory control.
The appropriate statistical tests of significance shall be consistent with the most current edition of
METHODS FOR MEASURING THE ACUTE TOXICITY OF EFFLUENTS AND RECEIVING
WATERS TO FRESHWATER AND MARINE ORGANISMS or other federal guidelines as appropriate or
required.
(b)
D. SPECIAL CONDITIONS (continued)
20. Whole Effluent Toxicity (WET) tests shall be conducted as follows: (continued)
(c) Test Conditions
(1) Test Type: Acute Static non -renewal
(2) All tests, including repeat tests for previous failures, shall include both test species listed below.
(3) Test species: Ceriodaphnia dubia and Pimephales promelas (fathead minnow). Organisms used in WET testing
shall come from cultures reared for the purpose of conducting toxicity tests and cultured in a manner consistent
with the most current USEPA guidelines. All test animals shall be cultured as described in the most current
edition of 'Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and •
Marine Organisms.
(4) Test period: 48 hours at the "Allowable Effluent Concentration" (AEC) specified above.
(5) Upstream receiving stream water shall be used as dilution water. If upstream water is unavailable or if mortality
in the upstream water exceeds 10%, "reconstituted" water will be used as dilution water. Procedures for -
generating reconstituted water will be supplied by the MDNR upon request.
(6) Unless otherwise specified above, multiple -dilution tests will be run with:
(a) 100%. 50%, 25°fo, 12.5%, and 6.25% effluent, unless the AEC is less than 25% effluent, in which case
dilutions will be 4 times the AEC, two times the AEC, AEC, 1/2 AEC and 1/4 AEC;
(b) 100% receiving -stream water (if available), collected upstream of the outfall at a point beyond any
influence of the effluent; and
(c) Reconstituted water.
(7) If reconstituted -water control mortality for a test species exceeds 10%, the entire test will be rerun.
(8) If upstream control mortality exceeds 10%, the entire test will be rerun using reconstituted water as the dilutant.
21. Due to the nature of concentrated industrial inputs and the suppression of nitrification in the MSD, Lemay treatment system,
all BOD samples should be seeded as per the Standard Methods for the Examination of Water and Wastewater, prior to testing
to assure a population of microorganisims capable of oxidizing the biodegradable organic matter in the sample.
22. The permittee shall implement and effectively operate and maintain the CSO controls identified in the Long Term control Plan
dated February 2011 and approved by the Department on June 1, 2011.
Page 18 of 36
Permit No. MO-0025151
E. SCHEDULE OF COMPLIANCE
1: The permittee shall submit annual reports to document implementation of the Nine Minimum Controls. The reports will be due
October 31 of each year.
F. SCHEDULE OF COMPLIANCE (For disinfection)
1. The permittee must attain compliance with the final effluent limits as soon as possible, but no later than December 31, 2013.
2. Within one year of issuance of this permit, the permittee shall report progress made in attaining compliance with the final
effluent limits.
3. Within two years of issuance of this permit, the permittee shall submit a report detailing progress made in attaining compliance
with the final effluent limits.
4. If the permittee fails to meet any of the interim dates above, the permittee shall notify the Department in writing of the reason
for non compliance no later than 14 days following each interim date.
5. Upon completion of construction, the permittee shall submit a Statement of Work Complete signed by the owner and a
Professional Engineer that is registered in the state of Missouri.
Page 19 of 36
Permit No. MO-0025151
SUMMARY OF TEST METHODOLOGY FOR ACUTE WHOLE -EFFLUENT TOXICITY TESTS
Whole -effluent -toxicity test required in NPDES permits shall use the following test conditions when performing single or multiple
dilution methods. Any future changes in methodology will be supplied to the permittee by the Missouri Department of Natural
Resources (MDNR). Unless more stringent methods are specified by the DNR, the procedures shall be consistent with the most
current edition of Methods for Measuring the Acute Tox(cty of E uents an Receiving Waters to Freshw ter and M e rgani
Test conditions for Ceriodavhnia dubia:
Test duration:
Temperature:
Light Quality:
Photoperiod:
Size of test vessel:
Volume of test solution:
Age of test organisms:
No. of animals/test vessel:
No. of replicates/concentration:
No. of organisms/concentration:
Feeding regime:
Aeration:
Dilution water:
Endpoint:
Test acceptability criterion:
Test conditions for Pimephales uromelas:
Test duration:
Temperature:
Light Quality:
Photoperiod:
Size of test vessel:
Volume of test solution:
Age of test organisms:
No. of animals/test vessel:
No. of replicates/concentration:
No. of organisms/concentration:
Feeding regime:
Aeration:
Dilution water:
Endpoint:
Test Acceptability criterion:
48 h
25 ± 1°C Temperatures shall not deviate by more than 3°C during
the test.
Ambient laboratory illumination
16 h light, 8 h dark
30 mL (minimum)
15 mL (minimum)
24 h old
5
4
20 (minimum)
None (feed prior to test)
None
Upstream receiving water; if no upstream flow, synthetic water
modified to reflect effluent hardness.
Pass/Fail (Statistically significant Mortality when compared to
upstream receiving water control or synthetic control if upstream
water was not available at p< 0.05)
90% or greater survival in controls
48 h
25 ± 1°C Temperatures shall not deviate by more than 3°C during
the test.
Ambient laboratory illumination
16 h light/ 8 h dark
250 mL (minimum)
200 mL (minimum)
1-14 days (all same age)
10
4 (minimum) single dilution method
2 (minimum) multiple dilution method
40 (minimum) single dilution method
20 (minimum) multiple dilution method
None (feed prior to test)
None, unless DO concentration falls below 4.0 mg/L; rate should
not exceed 100 bubbles/min.
Upstream receiving water; if no upstream flow, synthetic water
modified to reflect effluent hardness.
Pass/Fail (Statistically significant Mortality when compared to
upstream receiving water control or synthetic control if upstream
water was not available at p< 0.05)
90% or greater survival in controls
Total Toxic Organics (Note 2)
Acenaphthene
Acrolein
Acrylonitrile
Benzene
Benzidine
Carbon Tetrachloride (tetrachloromethane)
Chlorobenzene
1,2,4-trichlorobenzene
Hexachlorobenzene
1,2-dichloroethane
1,1,1-trichloroethane
Hexachloroethane
1,1-dichloroethane
1,1,2-trichloroethane
1,1,2,2-tetrachloroethane
Chloroethane
Bis (2-chloroethyl) ether
2-chloroethyl vinyl ether
N-nitrosodi-n-propy lamine
Pentachlorophenol
Phenol
Bis (2-ethylhexyl) phthalate
Butyl benzyl phthalate
Di-n-butyl phthalate
Di-n-octyl phthalate
Diethyl phthalate
Dimethyl phthalate
1,2-benzanthracene (benzo(a)anthracene)
Benzo(a)pyrene (3,4-benzopyrene)
3,4-benzofluoranthene (benzo(b)fluoranthene)
11,12-benzofluoranthene(benzo(k)fluoranthene)
Chrysene
Anthracene
1,12-benzoperylene(benzo(ghi)pervlene)
Fluorene
2-chloronaphthalene
2,4,6-trichlorophenol
Parachlorometa cresol
Chloroform (trichloromethane)
2-chlorophenol
I,2-dichlorobenzene
1,3-dichlorobenzene
1,4-dichorobenzene
3,3 -dic hlorobenzidine
1,1-dichloroethvlene
1,2-trans-dichioroethylene
2,4-dichlorophenol
1,2-dichloropropane (1,3-dichloropropane)
2,4-dimethylphenol
2,4-dinitrotoluene
2,6-dinitrotoluene
1,2-diphenylhydrazine
Ethylbenzene
Fluoranthene
Page 20 of 36
Permit No. MO-0025151
4-chlorophenyl phenyl ether
4-bromophenyl phenyl ether
Bis (2-chloroisopropyl) ether
Bis (2-chloroethoxy) methane
Methylene Chloride (dichloromethane)
Methyl Chloride (chloromethane)
Methyl bromide (bromomethane)
Bromoform (tribromomethane)
Dichlorobromomethane
Chlorodibromemethane
Hexachlorobutadiene
Hexachlorocyclopentadiene
Isophorone
Naphthalene
Nitrobenzene
2-nitrophenol
4-nitrophenol
2,4-dinitrophenol
4,6-dintro-o-cresol
N-nitrosodimethylamine
N-nitrosodiphenylamine
Phenanthrene
1,2,5,6-dibenzanthracene (dibenzo(a,h)anthracene)
Indeno (1,2,3-cd) pyrene
(2,3-o-pheny lene pyrene)
Pyrene
Tetrachloroethvlene
Toluene
Trichloroethvlene
Vinyl Chloride (chloroethylene)
Aldrin
Dieldrin
Chlordane (technical mixture and metabolites)
4,4-DDT
4,4-DDE (p,p-DDX)
4,4-DDD (p,p-TDE)
Alpha-endosulfan
Beta-endosulfan
Endosulfan sulfate
Endrin
Endrin aldehyde
Heptachlor
Heptachlor epoxide (BHC hexachIorocyclohexane)
Alpha-BHC
Beta-BHC
Gamma-BHC
Delta-BHC (PCB polychlorinated biphenyls)
PCB-1242 (Arochlor 1242)
PCB-1254 (Arochlor 1254)
PCB-1221 (Arochlor 1221)
PCB-1232 (Arochlor 1232)
PCB-1248 (Arochlor 1248)
PCB-1260 (Arochlor 1260)
PCB-1016 (Arochlor 1016)
Toxaphene
ATTACHMENT A
CSO LOCATIONS
Outfall #008
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #009
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #10
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #11
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #12
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #13
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #14
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #15
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 3102, St. Louis County
X= 737899.2, Y= 4269772.6
River des Peres (P)
River des Peres (P) 1710
07140101-0506
Land Grant 3102, St. Louis County
X=737752.9, Y=4270377.9
River des Peres (P)
River des Peres (P) 1710
07140101-0506
Land Grant 3102, St. Louis County
X=737831.2, Y=4270535.3
River des Peres (P)
River des Peres (P) 1710
07140101-0506
Land Grant 3102, St. Louis County
X=737577.2, Y=4271063.7
River des Peres (P)
River des Peres (P) 1710
07140101-0506
Land Grant 3102, St. Louis County
X=737060.4 Y=4271162.4
River des Peres (P)
River des Peres (P) 1710
07140101-0506
Land Grant 3102, St. Louis County
X=737205.9, Y=4271027.1
River des Peres (P)
River des Peres (P) 1710
07140101-0506
Land Grant 3102, St. Louis County
X=736831.2, Y=4271370.5
River des Peres (P)
River des Peres (P) 1710
07140101-0506
Land Grant 3217, St. Louis City
X=736902.8, Y=4.272213.5
Tributary to River des Peres
River des Peres (P) 1710
07140101-0506
Page 21 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #16
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #17
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall 418
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
LSGS Basin and Subwatershed:
Outfall #19
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #20
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall =21
Legal Description:
UTM Coordinates.
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall 422
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 3217, St. Louis City
X=736611.0, Y=4271876.0
Tributary to River des Peres
River des Peres (P) 1710
07140101-0506
Land Grant 1339, St. Louis County
X=736673.6, Y=4271419.6
River des Peres (P)
River des Peres (P) 1710
07140101-0506
Land Grant 3217, St. Louis County
X=736324.6, Y=4271585.5
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 3217, St. Louis County
X=735861.9, Y=4271663.9
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 1953, St. Louis County
X=735869.1, Y=4271604.5
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 3217, St. Louis County
X=735698.9. Y=4271809.4
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 3217, St. Louis County
X=735571.5, Y=4271930.8
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Page 22 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #23
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #24
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #25
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #26
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #27
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #28
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfa11 #29
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #30
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 3217, St. Louis County
X=734785.7, Y=4272761.9
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 1953, St_ Louis County
X=734236.5, Y=4273487.9
Tributary to River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 3217, St. Louis County
X=734385.2, Y=4273469.6
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Chant 1953, St. Louis County
X=734162.0, Y=4274099.4
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 3217, St. Louis County
X=734235.3, Y=4274063.3
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 3217, St. Louis County
X=733959.8, Y=4274505.8
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 3217, St. Louis County
X=733670.6, Y=4274892.8
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 2035, St. Louis County
X=733557.0, Y=4275508.2
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Page 23 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #31
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #32
Legal Description:
L:TM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #36
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #37
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #39
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #41
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #42
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #43
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2037, St. Louis County
X=733763.0, Y=4275724.1
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 2035, St. Louis City
X=733485.3, Y=4275490.6
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis City
X=733924.8, Y=4276612.5
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X=734203.3, Y=4276639.1
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X=734331.6, Y=4276819.9
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X= 734214.3, Y= 4276681.9
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X=7343 93.9, Y=4276910.3
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X= 734390.5, Y=4276942.7
River des Peres
River des Peres (P) 3827
07140101-0506
Page 24 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall # 44
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #48
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #50
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #52
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #53
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #54
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #57
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #58
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2037, St. Louis City
X=734759.1, Y=4277316.2
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X=735165.6, Y=4277715.4
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X=735354.9, Y=4278063.2
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis City
X=735749.9, Y=4278250.3
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis City
X=735911.8, Y=4278265.3
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis City
X=736171.6, Y=4278225.3
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X=736750.4, Y=4278346.2
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X=736755.7, Y=4278326.8
River des Peres
River des Peres (P) 3827
07140101-0506
Page 25 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #61
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
OutfalI #62
Legal Description:
LTTL1 Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #63
Legal Description:
UTrVI Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Duffel #64
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Duffel #66
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #67
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #68
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Duffel #69
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2037, St. Louis County
X=737158.8, Y=4278355.9
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis City
X=737209.7, Y=4278387.6
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2037, St. Louis County
X=737501.6, Y= 4278396.1
River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 0378, St. Louis County
X=734370.6, Y=4282866.6
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=734326.2, Y=4283206.7
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X= 734328.7, Y= 4283270.1
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=734335.9, Y= 4283278.2
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=734232.5, Y=4283429.3
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Page 26 of 36
Permit No.MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #70
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #71
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #72
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #73
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #74
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #75
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #76
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #77
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2033, St. Louis County
X=734202.2, Y=4283482.7
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St.. Louis County
X=734040.4, Y=4283684.0
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=734040.8,. Y=4283690.1
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=733873.5, Y=4283714.7
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=734005.3, Y=4283692.3
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=733841.9, Y=4283801.2
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=733824.8, Y=4283877.4
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2775, St. Louis County
X= 733607.6, Y=4284270.4
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Page 27 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #78
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #79
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #80
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #81
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #82
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #83
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #84
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall =85
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 0378, St. Louis County
X=733958.7, Y=4282695.4
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 0378, St. Louis County
X=733591.5, Y=4282736.1
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 0378, St. Louis County
X=733643.6, Y=4282723.4
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 0378, St. Louis County
X=733551.6, Y=4282728.7
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 0378, St. Louis County
X=733565.9, Y=4282740.4
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=732863.4, Y=4283335.2
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 0378, St. Louis County
X=733074.4, Y=4282852.0
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=732845.9, Y=4283356.4
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Page 28 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #86
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #87
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #88
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #89
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #90
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #91
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #92
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #93
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2033, St. Louis County
X=732707.8, Y=4283650.2
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=732849.2, Y=4283340.9
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=732291.2, Y=4283129.3
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=732039.8, Y=4283140.7
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=731716.4, Y=4282733.1
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=731716.1, Y=4282735.3
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=731716.4, Y=4282739.1
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=731781.1, Y=4283173.1
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Page 29 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #94
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #95
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall 496
Legal Description:
L T i Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #99
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall 0100
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
OutfalI #101
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #102
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall F103
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2033, St. Louis County
X=731686.7, Y=4283182.6
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=731597.6, Y=4283230.4
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2033, St. Louis County
X=731516.3, Y=4283372.3
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Section 4, T45\, RO6E, St. Louis County
X=731223.4, Y=4283875.5
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Section 33. T46N, RO6E, St. Louis County
X=731071.7, Y=4284481.5
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Section 33, T461\", RO6E, St. Louis County
X=731131.0, Y=4284723.9
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Section 5, T45N, RO6E, St. Louis County
X=729582.0, Y=4283812.4
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 2037, St. Louis County
X=733662.8, Y=4275906.0
Deer Creek (P)
Deer Creek (P) 3826
07140101-0504
Page 30 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #104
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfa11 #105
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #106
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
O tf 111
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #117
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #118
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #119
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #120
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2844, St. Louis County
X=732914.3, Y=4275866.4
Deer Creek (P)
Deer Creek (P) 3826
07140101-0504
Land Grant 2844, St. Louis County
X=732346.2, Y=4276141.9
Deer Creek (P)
Deer Creek (P) 3826
07140101-0504
Land Grant 1930, St. Louis County
X= 731088.8, Y= 4276978.7
Deer Creek
Deer Creek (P) 3826
07140101-0504
Section 21, T45N, RO6E, St. Louis County
X=731040.9, Y=4279078.7
Black Creek
Black Creek (P) 3825
07140101-0504
Section 27, T45N, RO6E, St. Louis County
X=732147.7, Y=4277144.5
Black Creek (P)
Black Creek (P) 3825
07140101-0504
Section 22, T45N, RO6E, St. Louis County
X= 732431.6, Y=4277619.1
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X=732477.7, Y=4277694.0
Tributary to Black Creek
Black Creek (P)3825
07140101-0504
Land Grant 2484, St Louis County
X= 732626.3, Y=4278040.6
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Page 31 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #121
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #122
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
U SGS Basin and Subwatershed:
Outfall # 123
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
U SGS Basin and Subwatershed:
Outfall #124
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #125
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall # 126
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #127
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall: 128
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2484, St. Louis County
X= 732629.3, Y=4278026.4
Tributary to BIack Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X= 732731.3, Y=4278305.8
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X=732792.4, Y=4278415.3
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X= 732944.3, Y=4278567.0
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X= 732955.2, Y=4278665.0
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X= 732950.4. Y=4278862.2
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X= 732944.4, Y= 4278862.5
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X=733095.1, Y=4279490.4
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Page 32 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #130
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #131
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #134
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #136
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #137
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #138
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #139
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #140
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2484, St. Louis County
X=733131.3, Y=4279665.6
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X=732459.7, Y=4278500.9
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X=732176.2, Y=4279093.7
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X=732232.6, Y=4279637.9
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X= 732149.7, Y=4279294.6
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X= 732168.4, Y=4279412.9
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X=732226.1, Y=4279762.3
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2484, St. Louis County
X= 732223.9, Y=4279761.1
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Page 33 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #141
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #142
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #143
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #144
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #147
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #149
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #151
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #152
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2484, St. Louis County
X=732204.2, Y=4279885.4
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 3102, St. Louis City
X=740204.0, Y=4271329.6
Mississippi River (P)
Mississippi River (P) 1707.02
07140101-0507
Land Grant 3102, St. Louis County
X= 739643.9, 4270406.8
Mississippi River (P)
Mississippi River (P) 1707.02
07140101-0507
Land Grant 3102, St. Louis County
X=739438.8. Y=4270024.7
lississippi River (P)
Mississippi River (P) 1707.02
07140101-0507
Land Grant 3102, St. Louis County
X= 738946.1, Y=4268804.2
Mississippi River (P)
Mississippi River (P) 1707.02
07140101-0507
Land Grant 3344, St. Louis County
X= 737893.1, Y=4265912.9
Mississippi River (P)
Mississippi River (P) 1707.02
07140101-0507
Land Grant 3344, St. Louis County
X= 737632.1, Y=4265225.0
Mississippi River (P)
Mississippi River (P)1707.02
07140101-0507
Land Grant 3344, St. Louis County
X=737556.9, Y= 4264949.3
Mississippi River (P)
Mississippi River (P) 1707.02
07140101-0507
Page 34 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #153
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #154
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #160
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #161
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #163
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #166
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #167
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #170
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 3344, St. Louis County
X=737463.4, Y=4264528.0
Mississippi River (P)
Mississippi River (P)1707.02
07140101-0507
Land Grant 3344, St. Louis County
X=737386.1, Y=4263915.5
Mississippi River (P)
Mississippi River (P) 1707.02
07140101-0507
Land Grant 2799, St. Louis County
X= 729637.9, Y=4280712.5
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 1930, St. Louis County
X= 729559.4, Y=4277128.4
Deer Creek
Deer Creek (P) 3826
07140101-0504
Land Grant 1953, St. Louis County
X=734401.6, Y=4271678.9
Tributary to River des Peres
River des Peres (P) 3827
07140101-0506
Land Grant 2035, St. Louis County
X=733013.9, Y=4275677.9
Tributary to Deer Creek
Deer Creek (P) 3826
07140101-0504
Land Grant 2033, St. Louis County
X=735176.3, Y=4283867.8
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 3102, St. Louis County
X= 737965.7, Y=4269575.1
River des Peres (P)
River des Peres (P)1710
07140101-0506
Page 35 of 36
Permit No. MO-0025151
ATTACHMENT A
CSO LOCATIONS (continued)
Outfall #173
Legal Description:
L TM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #176
Legal Description:
UT! Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #178
Legal Description:
LTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #179
Legal Description:
l TM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall 0180
Legal Description:
L Thf Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #181
Legal Description:
L TM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 2035, St. Louis County
X= 733472.6, Y=4275356.6
River des Peres (P)
River des Peres (P) 3827
07140101-0506
Section 27, T45N, RO6E, St. Louis County
X=732299.3, Y=4277347.1
Tributary to Black Creek
Black Creek (P) 3825
07140101-0504
Land Grant 2775, St. Louis County
X= 733592.9, Y=4284372.6
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Grant 3102, St. Louis City
X= 740453.9, Y=4271682.0
Mississippi River (P)
Mississippi River (P) 1707.02
07140101-0507
Land Grant 0378, St. Louis County
X=733815.4, Y=4282701.7
Tributary to River des Peres
River des Peres (P) 3827
07140101-0403
Land Gram 1339, St. Louis County
X= 736016.4, Y=4271326.4
Tributary to River des Peres
River des Peres (P) 3827
07140101-0506
Page 36 of 36
Permit No. MO-0025151
Missouri Department of Natural Resources
FACT SHEET
FOR THE PURPOSE OF RENEWAL
OF
MO-00025151
LEMAY WASTE WATER TREATMENT PLANT
The Federal Water Pollution Control Act ("Clean Water Act" Section 402 Public Law 92-500 as amended) established the National
Pollution Discharge Elimination System (NPDES) permit program. This program regulates the discharge of pollutants from point
sources into the waters of the United States, and the release of storm water from certain point sources. All such discharges are
unlawful without a permit (Section 301 of the "Clean Water Act"). After a permit is obtained, a discharge not in compliance with all
permit terms and conditions is unlawful. Missouri State Operating Permits (MSOPs) are issued by the Director of the Missouri
Department of Natural Resources (Department) under an approved program, operating in accordance with federal and state laws
(Federal "Clean Water Act" and "Missouri Clean Water Law" Section 644 as amended). MSOPs are issued for a period of five (5)
years unless otherwise specified.
As per [40 CFR Part 124.8(a)] and [10 CSR 20-6.020(1)2.] a Factsheet shall be prepared to give pertinent information regarding the
applicable regulations, rationale for the development of effluent limitations and conditions, and the public participation process for the
Missouri State Operating Permit (operating permit) listed below.
A Factsheet is not an enforceable part of an operating permit.
This Factsheet is for a Major
Part I — Facility Information
Facility Type: POTW
Facility SIC Code(s): 4952
Facility Description: The Lemay Wastewater Treatment Plant is an activated sludge secondary treatment plant consisting of six
grit/detritus tanks, five comminutors, two pre -aeration tanks, eight primary clarifiers with four additional wet weather primary
clarifiers, eight step -feed aeration tanks, twelve final clarifiers, three ash slurry ponds, five stormwater outfalls, and solids handling
facilities which include sludge dewatering belt filter presses, multiple hearth incinerators and landfill of incinerator ash.
Have any changes occurred at this facility or in the receiving water body that effects effluent limit derivation?
, - No.
Application Date: 06/21/10
Expiration Date: 12/29/10
Last Inspection: 09/23/2010 In Compliance ®;
OUTFALL(S) TABLE:
IOUTFALL
DESIGN FLOW
(CFS)
001 258.9
002 [ 2.8
003
004
005
006
007
variable
variable
variable
variable
variable
TREATMENT LEVEL
Secondary
Equivalent to
secondary
Stormwater
Stormwater
Stormwater
Stormwater
Stormwater
EFFLUENT TYPE
Municipal wastewater
Municipal wastewater
Stormwater runoff
Stormwater runoff
Stormwater runoff
Stormwater runoff
Stormwater runoff
DISTANCE TO
CLASSIFIED SEGMENT (MI)
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Outfall #001 — POTW
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #002 — POTIV
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #003 — Storm water runoff
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #004 — Storm water runoff
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #005 — Storm water runoff
Legal Description:
L: TM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall #006 — Storm water runoff
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Outfall *007 — Storm water runoff
Legal Description:
UTM Coordinates:
Receiving Stream:
First Classified Stream & ID:
USGS Basin and Subwatershed:
Land Grant 904, St. Louis County
X=738246.9, Y=4267463.0
Mississippi River (P)
Mississippi River (P) (01707.02)
07140101 — 0507
Land Grant 904, St. Louis County
X=738157.6, Y=4267204.3
Mississippi River (P)
Mississippi River (P) (01707.02)
07140101 — 00507
Land Grant 904, St. Louis County
X=738066.7, Y=4268550.1
Unnamed Tributary to River des Peres
River des Peres (P) (1710)
07140101-0506
Land Grant 904, St. Louis County
X=738101.2, Y=42684493
Unnamed Tributary to River des Peres
River des Peres (P) (1710)
07140101-0506
Land Grant 904, St. Louis County
X=738078.2, Y=4268408.5
Unnamed Tributary to River des Peres
River des Peres (P) (1710)
07140101-0506
Land Grant 904, St. Louis County
X=737948.0, Y=4268139.2
Unnamed Tributary to Mississippi River
Mississippi River (P) (01707.02)
07140101— 00507
Land Grant 904, St. Louis County
X=737788.5, Y=4268125.3
Unnamed Tributary to Mississippi River
Mississippi River (P) (01707.02)
07140101— 0507
Attachment A above provides a list of existing CSO outfalls.
2
Receiving Water Body's Water Quality & Facility Performance History:
A TMDL was conducted for the Mississippi River and approved on November 3, 2006. The TMDL is for Chlordane and
polychlorinated biphenyls (PCBs). This facility is not expected to add or contribute to this impairment due to both pollutants being
banned from use in the United States and low levels that enter the collections system are below detection in the facility.
The reported effluent levels for the facility are good, and however, there have been several exceeds of limit values in the past five (5)
years for three different outfalls. (utfal1001 had the following exceeds: 1) Total suspended solids (TSS): Three in 2005, two in
2006, three in 2007, four in 2008, and three in 2009; 2) Ammonia: One in 2007; 3) Oil and grease: One in 2006. Outfall 002 had the
following exceeds: 1) Total suspended solids (TSS): One in 2007; 2) biochemical oxygen demand (BOD5): One in 2009. Outfall 003
had the following exceeds: 1) Settleable solids (SS): One in 2009. Outfall 005 bad the following exceeds: 1) Settleable solids (SS):
Once in 2009; 2) Oil and grease: One in 2008. Outfall 006 had the following exceeds: 1) Oil and grease: One in 2008. Outfall 007
had the following exceeds: 1) Settleable solids (SS): Two in 2009 and one in 2010; 2) pH: One in 2010.
The facility experiences high levels of wet weather flows. Facility was under enforcement for sanitary sewer overflows that caused
pollution to waters of the state. The St. Louis Regional Office issued a Notice of Violation for a sanitary sewer overflow that occurred
in August 2010. This was the second SSO event in that month that was reported. At the time of the permit writing, the facility also is
negotiating a consent decree to address combined sewage overflows (CSOs) to comply with the EPA Clean Water Act and Missouri
Clean Water Law. U.S. Environmental Protection Agency (EPA) issued a CSO Control Policy in 1994 intended eventually to bring
CSOs nationwide into compliance with the Clean Water Act. The goals of CSO control are to:
1. Ensure that if CSOs occur, they are only as a result of wet weather,
2. Bring all wet weather CSO discharge points into compliance with the technology -based and water
quality -based requirements of the Clean Water Act, and
3. Minimize the impacts of CSOs on water quality, aquatic biota, and human health.
The CSO policy requires facilities with CSOs to prepare a Long -Term Control Plan (LTCP) describing how they will accomplish
these goals. The St. Louis Metropolitan Sewer District's LTCP dated February 2011 has been approved by the Departmetn as of June
1, 2011. The CSO outfalls that are allowed to discharge are attached to this permit in Attachment A.
Comments:
According to MSD's Long -Term Control Plan, during dry weather the capacity of the combined sewer system is sufficient so that
wastewater is conveyed to MSD's wastewater treatment plants. During heavy rainfall, the combination of stormwater and wastewater
may exceed the capacity of the combined sewer system. The excess flow, called combined sewer overflow (CSO), is discharged
directly to the Mississippi River or to one of the river's tributary streams through permitted outfall pipes. Many of the monitored
pump stations can release stormwater and wastewater to receiving waters (River des Peres, for instance). The facility has the capacity
to handle 340 MGD through primary treatment with the addition of the four new primary clarifiers. According to the Metropolitan St.
Louis Sewer District CSO Long -Term Control Plan Update, February 2011, page 11-14, the Lemay WWTP can achieve a secondary
treatment design capacity of 167 MGD.
The changes to discharge pipe for Outfall #001 to the Mississippi River have yet to be completed and will be handled in a
modification.
In 2004, a CORMIX mixing zone study' for the Mississippi River was submitted to the department and USEPA by Rockwood
Pigments (Rockwood) for review and comment. The purpose of the mixing zone study was to develop site -specific mixing and initial
dilution volumes of flow for the MSD, Lemay WWTP discharge into the Mississippi River.
During this CORMIX mixing zone review process, EPA did not agree with the use of 5-day carbonaceous biochemical oxygen
demand (CBOD5). Therefore, while past permits have had CBOD5, the 2007-revised permit had 5-day BOD. The facility must
demonstrate that enough nitrification of ammonia is taking place before this allowance can be granted.
The following documents collectively make up the mixing zone study submitted to the department and USEPA for review and comment:
"Mapping the discharge plume from the Lemay Wastewater Treatment Plant" prepared for Rockwood Pigments, St. Louis, Missouri by Burns & McDonnell
Engineering Company, Inc., Kansas City, Missouri; May 2004.
"CORMIX Modeling of the MSD Lemay WWTP Outfall to the Mississippi River" prepared for Rockwood Pigments, St. Louis, Missouri by HydroQual,
Inc; Project No. BSPM0010, June 2004.
MSD is accepting wastewater from remediation sites through their special discharge approval program. These discharges are typically
one-time only discharges. Baker Petrolite Corporation is an ongoing discharge of cis-1,2-dichloroethene at concentration of 0.003
mg/L and expected to discharge a volume of 50,000 gallons. This chemical should be below detection when mixed with other influent
flows.
3
Part II — Operator Certification Requirements
As per [10 CSR 20-6.010(8) Terms and Conditions of a Permit], permittees shall operate and maintain facilities to comply with the
Missouri Clean Water Law and applicable permit conditions and regulations. Operators or supervisors of operations at regulated
wastewater treatment facilities shall be certified in accordance with [10 CSR 20-9.020(2)] and any other applicable state law or
regulation. As per [10 CSR 20-9.010(2)(A)], requirements for operation by certified personnel shall apply to all wastewater treatment
systems, if applicable, as listed below:
Check boxes below that are applicable to the facility;
• Owned or operated by or for:
• Municipality/Public Sewer District
Each of the above entities are only applicable if they have a Population Equivalent greater than two hundred (200) and/or fifty (50) or
more service connections.
• Department required:
The Department requires this facility to retain the services of a certified
operator due to: Score in Appendix A greater than 71 points. Complexity of a plant of these size requires multiple A
certified operators
This facility currently requires an operator with A Certification Level. Please see Appendix A - Classification Worksheet
Modifications made to the wastewater treatment facility may cause the classification to be modified.
http://www.dnr.mo.gov/operator/index.do
Operator's Name: Rebecca Coyle, Steve Summers, Mark Sloan
Certification Number: 3245, 6956, 7197
Certification Level: A
The listing of the operator above only signifies that staff drafting this operating permit have reviewed appropriate Department records
and determined that the name (s) listed on the operating permit application has the correct and applicable Certification Level.
Part III — Receiving Stream Information
APPLICABLE DESIGNATIONS OF WATERS OF THE STATE:
As per Missouri's Effluent Regulations [10 CSR 20-7.015], the waters of the state are divided into the below listed seven (7)
categories. Each category lists effluent limitations for specific parameters, which are presented in each outfall's Effluent Limitation
Table and further discussed in the Derivation & Discussion of Limits section.
Missouri or Mississippi River [10 CSR 20-7.015(2)]:
10 CSR 20-7.031 Missouri Water Quality Standards, the Department defines the Clean Water Commission water quality objectives in
terms of "water uses to be maintained and the criteria to protect those uses." The receiving stream andhor 1' classified receiving
stream's beneficial water uses to be maintained are located in the Receiving Stream Table located below in accordance with [10 CSR
20-7.031(3)].
RECEN`LNGSTREAM(S) TABLE:
WATERBODY NAME CLASS i WVBID
Unnamed Trib to _Mississippi River
Mississippi River
Mississippi River
U
P 1707.02
DESIGNATED USES*
General Criteria
IRR, LWW, AQL, SCR,
DWS, IND
8-Darr
HUC
07140101
EDL: * *
Interior River Valleys
and Hills
Interior River Valleys
and Hills
Interior River Valleys
and Hills
- Irrigation (IRR), Livestock & Wildlife Watering (LWW), Protection of Warm Water Aquatic Life and Hunan Health -Fish Consumption (AQL), Cool Water
Fishery(CLF), Cold Water Fisher- (CDF), Whole Body Contact Recreation (BC I, Secondary Contact Recreation (SCR), Drinking Water Supply (DWS), Industrial.
(IND), Groundwater (GRW).
* * - Ecological Drainage Unit
* * * - UAA conducted on July 2005 and no final decision has been made on the UAA.
P 1701.03 LWW, AQL, SCR, DWS,
IND, «-BC(B)***
07140101
RECEIVING STREAM(S) LOW -FLOW VALUES TABLE:
RECEIVING STREAM (U, C, P)
Mississippi River (P)
1Q10
50,019.4
LOW -FLOW VALUES (CFS)
7Q10
54,691.6
30Q10
57,008.9
WE USED ONLY THE LAST 10 YEARS OF THE PERIOD OF RECORD FROM 1997 -2007. TO GENERATE THE LOW FLOW VALUE IN THE ABOVE
TABLE. THE PLOT AND THE EQUATION GENERATED FROM THE PLOT OF THE LOW FLOW STATISTICS IS IN APPENDIX B.
MIXING CONSIDERATIONS TABLE:
MIXING ZONE (CFS)
[10 CSR 20-7.031 4)(A) 4.B.(III)(a)]
7Q10 30Q10
7,951.6 8,075.2
ZONE OF INITIAL DILUTION (CFS)
[10 CSR 20-7.031 4)(A) 4.B.(llI)(b)1
1Q10 7Q10
764.3 795.2
In 2005, a CORMIX mixing zone study by Rockwood Pigments (Rockwood) for the Mississippi River was reviewed by the
department and USEPA. The purpose of the mixing zone study was to develop site -specific mixing and initial dilution volumes of
flow for the MSD, Lemay WWTP discharge into the Mississippi River.
After review of the mixing zone study by department staff, the revised calibration model was then used as the basis for predictive
model runs to determine appropriate concentrations of effluent ammonia from the MSD, Lemay WWTP that result in compliance with
applicable ammonia water quality criteria in the Mississippi River. These wasteload allocations for ammonia are presented below in
the discussion section.
Ammonia wasteload allocations for the MSD, Lemay WWTP were modeled through adjustment of effluent concentrations in the
CORMIX3 predictive model so that when background concentrations are taken into account, applicable instream water quality criteria
are met in the Mississippi River. .A maximum dilution ratio of 34.9:1 was determined at the end of the regulatory mixing zone and
resulted in compliance with applicable water quality criteria (see Part V - Effluent Limit Determination discussion below and
department memorandum).
132.8 MGD (205.84 cfs) was used as the effluent flow from the MSD, Lemay secondary treatment process and ash pond outfalls
[Outfall #001 — 131 MGD (203.05 cfs) actual flow, Outfall #002 —1.8 MGD (2.79 cfs) design flow]. Table 5 on page 10 of the
"CORMIX Modeling of the MSD Lemay WWTP Outfall to the Mississippi River" report provided the dilution at the respective low
flow values that were used.
Mixing Zone: One -quarter (1/4) of the stream volume of flow; length one -quarter (1/4) mile. [10 CSR 20-7.031(4)(A)4.B.0IIXa)].
Using the Cornell Mixing Zone Model (CORMIX) report (mentioned in the comment section above) Table 5 page 10, the maximum
dilution ration for each of the respective low flow characteristics are:
30Q10 = 39.2:1 or 8,075.2 cfs
7Q10 = 38.6:1 or 7,951.6 cfs
Zone of Initial Dilution: One -tenth (0.1) of the mixing zone volume of flow, not to exceed 10 times the effluent design flow. [10 CSR
20-7.031(4XA)4.B.(III)(b)].
1Q10 = 37.1:1 or 764.3 cfs
7Q10 =38.6:1 or 795.2 cfs
RECEIVING STREAM MONITORING REQUIREMENTS:
No receiving water monitoring requirements recommended at this time.
5
Part IV — Rationale and Derivation of Effluent Limitations & Permit Conditions
ALTERATIVE EVALUATIONS FOR NEW FACILITIES:
As per [10 CSR 20-7.015(4)(A)], discharges to losing streams shall be permitted only after other alternatives including land
application, discharges to a gaining stream and connection to a regional wastewater treatment facility have been evaluated and
determined to be unacceptable for environmental and/or economic reasons.
Not Applicable ®;
The facility does not discharge to a Losing Stream as defined by [10 CSR 20-2.010(36)] & [10 CSR 20-7.031(1)(N)], or is an existing
facility.
ANTI-BACICSLIDJNG:
A provision in the Federal Regulations [CWA §303(d)(4); CWA 3402(c); 40 CFR Part 122.44(1)] that requires a reissued permit to be
as stringent as the previous permit with some exceptions.
- Limitations in this operating permit for the reissuance of this permit conform to the anti -backsliding provisions of Section 402(o)
of the Clean Water Act, and 40 CFR Part 122.44.
ANTIDEGRADATION:
In accordance with Missouri's Water Quality Standard [10 CSR 20-7.031(2)], the Department is to document by means of
Antidegradation Review that the use of a water body's available assimilative capacity is justified. Degradation is justified by
documenting the socio-economic importance of a discharging activity after determining the necessity of the discharge.
® - Renewal no degradation proposed and no further review necessary.
AREA -WIDE WASTE TREATMENT «.ANAGEMENT & CONTINULNGAUTHORITF:
As per [10 CSR 20-6.010(3)(B)]....An applicant may utilize a lower preference continuing authority by submitting, as part of the
application. a statement waiving preferential status from each existing higher preference authority, providing the waiver does not
conflict with any area -wide management plan approved under section 208 of the Federal Clean Water Act or any other regional
sewage service and treatment plan approved for higher preference authority by the Department.
BIOSOLIDS, SLUDGE, & SEWAGE SLUDGE:
Bio-solids are solid materials resulting from wastewater treatment that meet federal and state criteria for beneficial uses (Le. fertilizer).
Sludge is any solid, semi -solid, or liquid waste generated from a municipal, commercial, or industrial wastewater treatment plant,
water supply treatment plant, or air pollution control facility or any other such waste having similar characteristics and effect. Sewage
sludge is solids, semi -solids, or liquid residue generated during the treatment of domestic sewage in a treatment works; including but
not limited to; domestic septage; scum or solids removed in primary, secondary, or advanced wastewater treatment process; and a
material derived from sewage sludge. Sewage sludge does not include ash generated during the firing of sewage sludge in a sewage
sludge incinerator or grit and screening generated during preliminary treatment of domestic sewage in a treatment works. Additional
information regarding biosolids and sludge is located at the following web address: http://dnr.mo.nov/env/wpp/pub/index.htmi, items
WQ422 through WQ449.
®- Permittee incinerates sludge/biosolids in accordance with Standard Conditions III, Section F and a Department approved
biosolids management plan.
COMPLIANCE AND ENFORCEMENT:
Enforcement is the action taken by the Water Protection Program (WPP) to bring an entity into compliance with the Missouri Clean
Water Law, its implementing regulations, and, or any terms and conditions of an operating permit. The primary purpose of the
enforcement activity in the WPP is to resolve violations and return the entity to compliance.
Applicable ®;
The permittee `facility is currently under enforcement action due to wet weather issues related to EPA's Combined Sewer Overflows
(CSO) Policy and a required approval of a Long-term Control Plan to address CSOs.
6
PRETREATMENT PROGRAM:
The reduction of the amount of pollutants, the elimination of pollutants, or the alteration of the nature of pollutant properties in
wastewater prior to or in lieu of discharging or otherwise introducing such pollutants into a Publicly Owned Treatment Works [40
CFR Part 403.3(q)].
Pretreatment programs are required at any POTW (or combination of POTW operated by the same authority) and/or municipality with
a total design flow greater than 5.0 MGD and receiving industrial wastes that interfere with or pass through the treatment works or are
otherwise subject to the pretreatment standards. Pretreatment programs can also be required at POTWs/municipals with a design flow
less than 5.0 MGD if needed to prevent interference with operations or pass through.
Several special conditions pertaining to the permittee's pretreatment program may be included in the permit, and are as follows:
• Implementation and enforcement of the program,
• Annual pretreatment report submittal,
• Submittal of list of industrial users,
• Technical evaluation of need to establish local limitations, and
• Submittal of the results of the evaluation
Applicable ®;
This permittee has an approved pretreatment program in accordance with the requirements of [40 CFR Part 403] and [10 CSR 20-
6.100] and is expected to implement and enforce its approved program.
REASONABLE POTENTIAL ANALYSIS (RPA):
Federal regulation [40 CFR Part 122.44(d)(1)(i)] requires effluent limitations for all pollutants that are or may be discharged at a level
that will cause or have the reasonable potential to cause or contribute to an in -stream excursion above narrative or numeric water
quality standard.
In accordance with [40 CFR Part 122.44(d)(iii)] if the permit writer determines that any give pollutant has the reasonable potential to
cause, or contribute to an in -stream excursion above the WQS, the permit must contain effluent limits for that pollutant.
Applicable ®;
A RPA was conducted on appropriate parameters for Outfall #001 and #002. Please see APPENDIX C — RPA RESULTS.
REMOVAL EFFICIENCY:
Removal efficiency is a method by which the Federal Regulations define Secondary Treatment and Equivalent to Secondary
Treatment, which applies to Biochemical Oxygen Demand 5-day (BOD5) and Total Suspended Solids (TSS) for Publicly Owned
Treatment Works (POTWs)/municipals. Please see the United States Environmental Protection Agency's (EPA) website for
interpretation of percent removal requirements for National Pollutant Discharge Elimination System Permit Application Requirements
for Publicly Owned Treatment Works and Other Treatment Works Treating Domestic Sewage @ www.epa.gov/fedrestr/EPA-
WATER/1999/August/Dav-04/w18866.htm
Applicable ®; Applicable to Outfall #001.
Secondary Treatment is 85% removal [40 CFR Part 133.102(a)(3) & (b)(3)].
Removal efficiency is not applicable to Outfall #002. This discharge is from ash slurry lagoons where water is mixed with ash from
the sludge incinerator to create a slurry. The influent water used in this process has received the same secondary treatment as the
discharge from outfall #001.
7
SANITARY SEWER OVERFLOWS (SSOS), BYPASSES, INFLOW & INFILTRATION (I&I) — PREVENTION/REDUCTION:
Sanitary Sewer Systems (SSSs) are municipal wastewater collection systems that convey domestic, commercial, and industrial
wastewater, and limited amounts of infiltrated groundwater and storm water (i.e. I&I), to a POTW. SSSs are not designed to collect
large amounts of storm water runoff from precipitation events.
Untreated or partially treated discharges from SSSs are commonly referred to as SSOs. SSOs have a variety of causes including
blockages, line breaks, sewer defects that allow excess storm water and ground water to overload the system, lapses in sewer system
operation and maintenance, inadequate sewer design and construction, power failures, and vandalism. A SSOs is defined as an
untreated or partially treated sewage release from a SSS. SSOs can occur at any point in an SSS, during dry weather or wet weather.
SSOs include overflows that reach waters of the state. SSOs also include overflows out of manholes and onto city streets, sidewalks,
and other terrestrial locations.
Applicable ®;
In accordance with 40 CFR Part 122.41(e), the permittee is required to develop and/or implement a program for maintenance and
repair of the collection system and shall be required in this operating permit by either means of a Special Condition or Schedule of
Compliance. In addition, the Department considers the development of this program as an implementation of this condition.
Additionally, 40 CFR Part 403.3(o) defines a POTLV to include any device and systems used in the storage, treatment, recycling and
reclamation of municipal sewage or industrial wastes of liquid nature. It also includes sewers, pipes, and other conveyances only if
they convey wastewater to a POTW Treatment Plant.
At this time, the Department recommends the US EPA's Guide for Evaluating Capacity, Management, Operation and Maintenance
(CMOM) Programs At Sanitary Sewer Collection Systems (Document # EPA 305-B-05-002). The CMOM identifies some of the
criteria used by the EPA to evaluate a collection system's management, operation, and maintenance and was intended for use by the
EPA, state, regulated community, and'or third party entities. The CMOM is applicable to small, medium, and large systems; both
public and privately owned; and both regional and satellite collection systems. The CMOM does not substitute for the Clean Water
Act, the Missouri Clean Water Law, and both federal and state regulations, as it is not a regulation.
SCHEDULE OF COMPLLA_NCE (SOC):
A schedule of remedial measures included in a permit, including an enforceable sequence of interim requirements (actions, operations,
or milestone events) leading to compliance with the Missouri Clean Water Law, its implementing regulations, and.'or the terms and
conditions of an operating permit.
Applicable ®;
The time given for effluent limitations of this permit listed under Interim Effluent Limitation and Final Effluent Limitations were
established in accordance with [10 CSR 20-7.031(10)].
STORM RATER POLLUTION PREVENTION PLAN (SWPPP):
In accordance with 40 CFR 122.44(k) Best Management Practices IB_MPss to control or abate the discharge of pollutants when: (1)
Authorized under section 304(e) of the Clean Water Act (CWA) for the control of toxic pollutants and hazardous substances from
ancillary industrial activities: (2) Authorized under section 402(p) of the CWA for the control of storm water discharges; (3) Numeric
effluent limitations are infeasible; or (4) the practices are reasonably necessary to achieve effluent limitations and standards or to carry
out the purposes and intent of the CWA.
In accordance with the EPA's Developing Your Stormwater Pollution Prevention Plan, .4 Guide for Industrial Operators, (Document
number EPA 833-B-09-002) [published by the United States Environmental Protection Agency (USEPA) in February 2009], BMPs
are measures or practices used to reduce the amount of pollution entering (regarding this operating permit) waters of the state. BMPs
may take the form of a process, activity, or physical structure.
Additionally in accordance with the Storm Water Management, a SWPPP is a series of steps and activities to (1) identify sources of
pollution or contamination, and (2) select and carry out actions which prevent or control the pollution of storm water discharges.
Applicable ®;
A SWPPP shall be developed and implemented for each site and shall incorporate required practices identified by the department with
jurisdiction.
8
VARIANCE:
As per the Missouri Clean Water Law § 644.061.4, variances shall be granted for such period of time and under such terms and
conditions as shall be specified by the commission in its order. The variance may be extended by affirmative action of the
commission. In no event shall the variance be granted for a period of time greater than is reasonably necessary for complying with the
Missouri Clean Water Law §§644.006 to 644.141 or any standard, rule or regulation promulgated pursuant to Missouri Clean Water
Law §§644.006 to 644.141.
Not Applicable ®;
This operating permit is not drafted under premises of a petition for variance.
WASTELOAD ALLOCATIONS (WLA) FOR LIMITS:
As per [10 CSR 20-2.010(78)], the amount of pollutant each discharger is allowed by the Department to release into a given stream
after the Department has determined total amount of pollutant that may be discharged into that stream without endangering its water
quality.
Applicable ®;
Wasteload allocations were calculated where applicable using water quality criteria or water quality model results and the dilution
equation below:
(Cs x Qs) + (Ce x Qe)
C = (EPA/505/2-90-001, Section 4.5.5)
(Qe + Qs)
Where C = downstream concentration
Cs = upstream concentration
Qs = upstream flow
Ce = effluent concentration
Qe = effluent flow
Chronic wasteload allocations were determined using applicable chronic water quality criteria (CCC: criteria continuous
concentration) and stream volume of flow at the edge of the mixing zone (MZ). Acute wasteload allocations were determined using
applicable water quality criteria (CMC: criteria maximum concentration) and stream volume of flow at the edge of the zone of initial
dilution (Z1D).
Water quality based maximum daily and average monthly effluent limitations were calculated using methods and procedures outlined
in USEPA's "Technical Support Document For Water Quality -based Toxics Control" (EPA150512-90-001).
Number of Samples "n":
Additionally, in accordance with the TSD for water quality -based permitting, effluent quality is determined by the underlying
distribution of daily values, which is determined by the Long Term Average (LTA) associated with a particular Wasteload Allocation
(WLA) and by the Coefficient of Variation (CV) of the effluent concentrations. Increasing or decreasing the monitoring frequency
does not affect this underlying distribution or treatment performance, which should be, at a minimum, be targeted to comply with the
values dictated by the WLA. Therefore, it is recommended that the actual planned frequency of monitoring normally be used to
determine the value of "n" for calculating the AML. However, in situations where monitoring frequency is once per month or less, a
higher value for "n" must be assumed for AML derivation purposes. Thus, the statistical procedure being employed using an assumed
number of samples is "n = 4" at a minimum. For Total Ammonia as Nitrogen, "n = 30" is used.
WLA MODELING:
There are two general types of effluent limitations, technology -based effluent limits (TBELs) and water quality -based effluent limits
(WQBELs). If TBELs do not provide adequate protection for the receiving waters, then WQBEL must be used.
Not Applicable ®;
A WLA study was either not submitted or determined not applicable by Department staff.
WATER QUALITY STANDARDS:
Per [10 CSR 20-7.031(3)1 General Criteria shall be applicable to all waters of the state at all times including mixing zones.
Additionally, [40 CFR 122.44(d)(1)] directs the Department to establish in each NPDES permit to include conditions to achieve water
quality established under Section 303 of the Clean Water Act, including State narrative criteria for water quality.
9
WHOLE EFFLUENT TOXICITY (WET) TEST:
A WET test is a quantifiable method of determining if a discharge from a facility may be causing toxicity to aquatic life by itself, in
combination with or through synergistic responses when mixed with receiving stream water.
Applicable ®;
Linder the federal Clean Water Act (CWA) §101(a)(3), requiring WET testing is reasonably appropriate for site -specific Missouri
State Operating Permits for discharges to waters of the state issued under the National Pollutant Discharge Elimination System
(NPDES). WET testing is also required by 40 CFR 122.44(d)(1). WET testing ensures that the provisions in the 10 CSR 20-
6.010(8)(.A)7. and the Water Quality Standards 10 CSR 20-7.031(3)(D),(F),(G),(I)2.A & B are being met. Under [10 CSR 20-
6.010(8)(A)4], the Department may require other terms and conditions that it deems necessary to assure compliance with the Clean
Water Act and related regulations of the Missouri Clean Water Commission. In addition the following MCWL apply: § 644.051.3
requires the Department to set permit conditions that comply with the MCWL and CWA; 644.051.4 specifically references toxicity as
an item we must consider in writing permits (along with water quality -based effluent limits, pretreatment, etc...); and 644.051.5 is the
basic authority to require testing conditions. WET test will be required by all facilities meeting the following criteria:
® Facility- is a designated Major.
® Facility handles large quantities of toxic substances, or substances that are toxic in large amounts.
Facility has Water Quality --based Effluent Limitations for toxic substances (other than NH3)
® Facility is a municipality or domestic discharger with a Design Flow ? 22,500 gpd.
303(d) LIST & TOTAL MAXIMUM DAILY LOAD (TMDL):
Section 303(d) of the federal Clean Water Act requires that each state identify waters that are not meeting water quality standards and
for which adequate water pollution controls have not been required. Water quality standards protect such beneficial uses of water as
whole body contact (such as swimming). maintaining fish and other aquatic life, and providing drinking water for people, livestock
and wildlife. The 303(d) list helps state and federal agencies keep track of waters that are impaired but not addressed by normal water
pollution control programs.
A TMDL is a calculation of the maximum amount of a given pollutant that a body of water can absorb before its water quality is
affected. If a water body is determined to be impaired as listed on the 303(d) list, then a watershed management plan will be
developed that shall include the TMDL calculation
Applicable ®;
Mississippi River is listed on the 2002 Missouri 303(d) List for Chlordane and PCB.
- This facility is not considered to be a source of the above listed pollutant(s) or considered to contribute to
Mississippi River.
Because chlordane and PCBs were banned in 1988 and 1977, respectively, there should be negligible discharge
PCBs into streams from wastewater treatment plants and other point sources. Therefore, the WLA is set as zero
Total Maximum Daily Load (TMDL) that was approved November 3, 2006.
the impairment of
of chlordane and
pounds/day in the
10
Part V — Effluent Limits Determination
Outfall #OO1 —Main Facility Outfall
Effluent limitations derived and established in the below Effluent Limitations Table are based on current operations of the facility.
Future permit action due to facility modification may contain new operating permit terms and conditions that supersedes the terms and
conditions, including effluent limitations, of this operating permit.
EFFLUE
- -- -- - f - - ---
PARAMETER
UNIT
BASIS
FOR
Limn
DAILY
MAXIMUM
WEEKLY
AVERAGE
MONTHLY
AVERAGE
MODIFIED
PREVIOUS PERMIT
LIMITATIONS
FLOW
GPD
1
*
*
NO
CBOD5
MG/L
1
40
25
YES
BOD
TSS
MG/L
1
45
30
No
PH
SU
1
6.5 — 9.0
6.5 — 9.0
YES
6.0-9.0
TEMPERATURE
°C
1,8
*
*
No
EscHERICHfACOLI
(E. COLI)
***
1,2,3
INTERIM
*
FINAL
*
INTERIM
*
FINAL
1134
NEW
NOT AVAILABLE
TOTAL RESIDUAL CHLORINE
MG/L
2,3
0.077
0.13m1
0.038
0.13m1
NEW
ONLY IN
FACLSHEET
AMMONIA As N
(APR 1— SEPT 30)
Mo/L
LBS/DAY
2,3,5
38.8
42,714
23.3
26,651
No
PENAL
LIMITATIONS
AMMONIA As N
(OcT 1—MAR 31)
MG/L
LBS/DAY
2,3,5
77.9
85,759
48.6
51,301
No
FINAL
LIMITATIONS
Om & GREASE (MG/L)
MG/L
1
15
10
No
ARSENIC, TOTAL
RECOVERABLE
liga,
2,3
*
*
NO
CADMIUM, TOTAL
RECOVERABLE
Aga,
2,3
7.8
2.7
YES
MONITORING
MERCURY, TOTAL
RECOVERABLE
µe,
2,3
*
*
NO
NICKEL, TOTAL
RECOVERABLE
KA
2,3
*
*
No
SILVER, TOTAL RECOVERABLE
µg/L
2,3
21.5
7.4
YES
MONITORING
ZINC, TOTAL RECOVERABLE
µg/L
2,3
*
*
No
CYANIDE, AMENDABLE TO
CHLORINATION
2,3
39.1
12.6
16.0 ML
YES
MONITORING
CHROMIUM (QI), TOTAL
RECOVERABLE
lig&
2,3
*
*
NEW
TOTAL
CHROMIUM ONLY
CHROMIUM OM, DIssoLVED
pg/L
2,3
*
*
NEW
TOTAL
CHROMIUM ONLY _
COPPER, TOTAL
RECOVERABLE
NA,
2,3
*
*
No
LEAD, TOTAL RECOVERABLE
µg/L
2,3
*
*
No
CHEMICAL OXYGEN DEMAND
MGIL
2,3
*
*
No
TOTAL PHOSPHORUS AS P
MG/L
2,3
*
*
No
NITRITE &NrTRATE
MG/L
2,3
*
*
No
TOTAL NITROGEN AS N
MG/L
2,3
*
*
No
HARDNESS
MG/L
2,3
*
*
NO
TOTAL TOXIC ORGANICS
MG/L
2,3
*
*
No
WHOLE EFFLUENT TOXICITY
(WET) TEST
%
Survival
11
Please see WET Test in the Derivation and Discussion
Section below.
MONITORING FREQUENCY
Please see Minimum Sampling and Reporting Frequency Requirements in the Derivation and
Discussion Section below.
* - Monitoring requirement only.
** - For DO the Daily Maximum is a Daily Minimum and the Monthly Average is a Monthly Average Minimum.
*** - # of colonies/100mL; the Monthly Average for E. colt is a geometric mean.
**** - Parameter not previously established in previous state operating permit.
11
Basis for Limitations Codes:
1. State or Federal Regulation/Law
2. Water Quality Standard (includes RPA)
3. Water Quality Based Effluent Limits
4. Lagoon Policy
5. Ammonia Policy
6. Dissolved Oxygen Policy
EFFLUENT LIMITATIONS TABLE: OL-TFALL#002
7. Antidegradation Policy
8. Water Quality Model
9. Best Professional Judgment
10. TMDL or Permit in lieu of TMDL
11. WET Test Policy
12. Antidegradation Review
PARAMETER
BASS DAILY I WEEKLY MONTHLY
UNIT I FOR
LIMITS
MAVERAGE
i AVERAGE � Y[.G2V fGE
MODIFIED PREVIOUS PERMIT
LIMITATIONS
FLOW i GPD
1
* NO
BOD5 mot
1 ! 45
30 NO
TSS 1 MGIL
1
90
65 No
PH SL7
1 6.5-9.0
6.5-9.0 YES
6.0-9.0
TEMPERATURE
1,8
* No
ESCHERICHIA COLI
(E. COL1)
* * *
1,2,3
INTERIM
FINAL
*
INTERIM
*
FINAL
1134
NEW
NOT AVAILABLE
TOTAL RESIDUAL ChLORINE
AMMONIA AS N
(APR 1 — SEPT 30)
�IG;L 2,3 5.4
:vat
,3,5
2.7 NEW
YES
INFACTSHEET
ONLY
FINAL
LIMITATIONS
AMMONIA AS N
(OCT 1—M_AR 31)
MGII: 2,3,5
YES
FINAL
LmllTATIONS
OIL & GREASE (MGT.) MG L ; 1
15
10 No
ARSENIC, TOTAL
RECOVERABLE
ug;L. ? 2,3
* No
C ADNEUM, TOTAL
RECOVERABLE
No
MERCURY, TOTAL.
RECOVERABLE
ugt
2,3
* ! NO
NICKEL, TOTAL
RECOVERABLE
!AWL j 2,3
No
SILVER, TOTAL RECOVERABLE ug'L 2,3
* No
ZINC, TOTAL RECOVERABLE ug'T. 2,3 *
ug/L 2,3 *
CYANIDE, :i NMXDABLE TO
CHLORINATION
* No
* ! No
CIotoMiuM OE), TOTAL
RECOVERABLE
lig L 2,3
* NEW
To a;.
CiMON>='tm.i ONLY
CiLROMIUM (VI), DISSOLVED
2,3
*
*
NEW
TOTAL
CHROMIUM ONLY
COPPER, TOTAL
RECOVERABLE
ug'1,
2,3
* No
LEAD, TOTAL RECOVERABLE
}tgiL
2,3
*
*
No
Ci MICAL OXYGEN DEMAND
mot
2,3
*
No
TOTAL. PHOSPHORUS AS P
MG'L
2,3
*
* E No
NITRITE & NITRATE
MGrL
2,3
*
* No -
TOTAL NITROGEN AS N mGIL 2,3
*
No
TOTAL TOXIC ORGANICS MG/ 2,3
WHOLE EFFLUENT TOXICITY I % 1 1
(WET) TEST Survival
*
*
NO
Please see WET Test in the Derivation and Discussion
Section below.
MONITORING FREQUENCY
Please see Minimum Sampling and Reporting Frequency Requirements in the Derivation and
Discussion Section below.
* - Monitoring requirement only.
* ■ - For DO the Daily Maximum is a Daily Minimum and the Monthly Average is a Monthly Average Minimum.
** - 0 of colonies: l0umL; the Monthly Average for E. coli is a geometric mean.
**** - Parameter not previously established in previous state operating permit.
12
Basis for Limitations Codes:
1. State or Federal Regulation/Law
2. Water Quality Standard (includes RPA)
3. Water Quality Based Effluent Limits
4. Lagoon Policy
5. Ammonia Policy
6. Dissolved Oxygen Policy
7. Antidegradation Policy
8. Water Quality Model
9. Best Professional Judgment
10. TMDL or Permit in lieu of TMDL
11. WET Test Policy
12. Antidegradation Review
OUTFALL #001— DERIVATION AND DISCUSSION OF LINHTS:
▪ Flow. In accordance with [40 CFR Part 122.44(i)(I)(ii)] the volume of effluent discharged from each outfall is needed to assure
compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of
the permittee to inform the department, which may require the submittal of an operating permit modification. Final secondary
treatment design flow wilt be determined after the completion of a stress test.
• Carbonaceous Biochemical Oxygen Demand (BODSZ Please see the APPLICABLE DESIGNATION OF WATERS OF THE STATE
sub -section of the Receiving Stream Information. The facility demonstrated that enough nitrification of ammonia is taking
place. MSD petitioned and submit summary data to the department to obtain CBOD5 effluent limitations of 25 mg/L monthly
average, 40 mg/L weekly average per 10 CSR 20-7.015(2)(A)6. Final secondary treatment design flow will be determined after
the completion of a stress test.
• Total Suspended Solids (TSS). Effluent limitations have been retained from previous state operating permit, please see the
APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information.
RH. Effluent limitations have been modified from previous state operating permit, to 6.5-9.0 SU per 10 CSR 20-7.015(2)(A)3,
please see the APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information.
• Oil & Grease. Effluent limitations have been retained from previous state operating permit. Conventional pollutant, effluent
limitation for protection of aquatic life; 10 mg/L monthly average, 15 mg/L daily maximum.
• Escherichia coli (E. coli). The Monthly Average limit is 1,134 per 100 ml as a geometric mean during the recreational season
(April 1— October 31) to protect Secondary Contact Recreation (SCR) designated use of the receiving stream, as per 10 CSR 20-
7.031(4)(C). Weekly monitoring is required to determine compliance pursuant to 10 CSR 20-7.031(4)(C). The effluent
variability may be used for development of future effluent limits to protect the SCR designated use this waterbody. Development
of a weekly average limitation pursuant to the federal regulation 40 CFR 122.45(d) is not practicable at this time.
The facility has no disinfection capabilities; therefore the discharge cannot immediately comply with a water quality -based
effluent limitation (WQBEL). A schedule of compliance is appropriate and will lead to compliance with the final WQBEL as
soon as possible.
• Total Ammonia Nitrogen. Early Life Stages Present Total Ammonia Nitrogen criteria apply [10 CSR 20-7.031(4)(B)7.C. &
Table B3] default pH 7.8 SU.. A reasonable potential analysis was conducted for ammonia. Please see Appendix C — RPA
Results. There was reasonable potential to exceed. Therefore, a water quality -based effluent limitation was determined.
Summer: April 1 — September 30
WLAcomx = 26.64 mg NIL
LTAc = 26.64 mg/L (0.693) = 18.5 mg/L [CV = 0.9, 99th Percentile, 30 day avg.]
Use most protective number of LTAc or LTA,.
1V1DL = 18.5 mg/L (4.46) = 82.5 mg/L [CV = 0.9, 99th Percentile]
AML = 18.5 mg/L (1.29) = 23.9 mg/L [CV = 0.9, 95th Percentile, n =30]
Winter: October 1— March 31
WLAcomax = 53.28 mg NIL
LTA, = 53.28 mg/L (0.618) = 32.9 mg/L [CV = 1.19, 99th Percentile, 30 day avg.]
13
Use most protective number of LTAc or LTAa.
MDL = 32.9 mg,L (5.76) = 189.5 mg/L [CV = 1.19, 99th Percentile]
AML = 32.9 mg.L (1.39) = 45.7 mg/L jCV = 1.19, 951 Percentile, n =30]
The limitations above exceed those previously provided as limitations. A provision in the Federal Regulations [CWA
§303(d)(4); CWA §402(c); 40 CFR Part 122.44(1)] that requires a reissued permit to be as stringent. as the previous permit.
Because none of the exceptions apply to this discharge, the limitation below must be retained within the permit.
Below is the 2005 memorandum providinu the ammonia wasteload allocation and limit determination:
MEMORANDUM
DATE: December 19, 2005
TO: File
FROM: John Hoke, NPDES Permits & Engineering Section
CC: John Lodderhose, Metropolitan St. Louis Sewer District (MSD)
John Dunn, USEPA Region 7
Harry Reid, Rockwood Pigments .
Andrew Thuman, HydroQual Inc.
SUBJECT: Addendum to November 21, 2005 Water Quality Review Sheet (WQRS)
MSD; Lemay WWTP (MO-0025151)
This is to provide additional information and calculations regarding the proposed ammonia effluent limitations for the MSD,
Lemay WWTP. The WQRS developed for the operating permit renewal (PN - November 23, 2005) contained effluent limitations
for ammonia as nitrogen based on a COR\IIX mincing zone study developed by HydroQual, Inc. and revised by USEPA. The
revisions were necessary to better reproduce conditions observed during the field study and to ensure predictive model runs
resulted in compliance with applicable ammonia water quality criteria.
During the public comment period, department staff met with staff from MSD, USEPA Region 7, Rockwood Pigments, and
HydroQual Inc. to discuss the proposed effluent limitations and CORMIX modeling approach. The result of these meetings was
an agreement on the modeling approach to be used and revised dilution flow and wasteload allocations for ammonia as nitrogen.
The department and USEPA received electronic copies of the CORMIX predictive runs containing revised dilution flow and
wasteload allocations from HydroQual Inc. on December 15, 2005. The revised dilution flow, wasteload allocations, and
resulting effluent limitations for ammonia as nitrogen follow:
Mississippi River 7Q10 low -flow value — 52,232 cubic feet/second
Effluent flow from MSD. Lernay WWTP —132 MGD (204.2 cubic feet/second)
CORMIX Maximum Dilution Flow — 38.1
Water quality based maximum daily and average monthly effluent limitations were calculated using methods and procedures
outlined in USEPA's "Technical Support Document For Water Quality -based Toxics Control" (EPA, 505, 2-90-001). Coefficient
of Variation (CV) calculated using discharge monitoring report (DMR) data from 10 31-00 — 09/30/05. Session files from the
CORMIX predictive runs showing wasteload allocations can be found in Appendix A.
Summer
WLAco = 26.64 mg N;L
LTAc = 26.64 mg L (0.643) = 17.1 mg N/L
MDL = 17.1 mg.L * 2.27 = 38.8 mg N/L
AML = 17.1 mgL * 1.36 = 23.3 mg NI
WLAcoRma = 53.28 mg N/L
LTAc = 53.28 mg/L (0.643) = 34.3 mg N/L
MDL = 34.3 mg/L* 2.27 = 77.9 mg N/L
AML = 34.3 mg/L * 1.36 = 46.6 mg NL
[CV = 0.4, 99th Percentile]
[CV = 0.4, 99th Percentile]
[CV = 0.4, 951 Percentile, n = 4]
Winter
[CV = 0.4, 99th Percentile]
[CV = 0.4, 99" Percentile]
[CV = 0.4, 95t1 Percentile, n = 4]
14
Season
Summer
Winter
Maximum Daily Limit
mg NIL
38.8
77.9
lbs/day
42,714
85,759
Average Monthly Limit
mg NIL
23.3
46.6
lbs/day
25,651
51,301
The CORMDC predictive models and resulting wasteload allocations are deemed protective of applicable water quality criteria at
the end of the regulatory mixing zone.
• Total Residual Chlorine (TRC). Warm -water Protection of Aquatic Life CCC =10 µg/L, CMC = 19 µg/L [10 CSR 20-7.031,
Table A]. Background TRC = 0.0 µg/L.
Cd =(((Qe+Qs)*C) - (Qs*Cs))IQe
Chronic WLA:
Acute WLA:
CB = ((258.9 + 7951.6)10 — (7951.6 * 0.0))/258.9
Ce = 317.1 µg/L
Ce = ((258.9 + 795.2)19 — (795.2 * 0.0))/258.9
CB = 77.4 µg/L
LTA, = 317.1 (0.527) =167.1 µg/L
LTA. = 77.4 (0.321) = 24.8 µg/L
Use most protective number of LTA, or LTA,.
MDL = 24.8 (3.11) = 77.1 µg/L
AML = 24.8 (1.55) = 38.4 µg/L
[CV = 0.6, 99th Percentile]
[CV = 0.6, 99th Percentile]
[CV = 0.6, 99th Percentile]
[CV = 0.6, 95th Percentile, n = 4]
Total Residual Chlorine effluent limits of 0.077 mg/L daily maximum, 0.038 mg/L monthly average are recommended if
chlorine is used as a disinfectant. Standard compliance language for TRC, including the minimum level (ML), should be
included in the permit.
• Oil & Grease. Conventional pollutant, effluent limitation for protection of aquatic life; 10 mg/L monthly average, 15 mg/L daily
maximum.
• Cyanide, Amenable to Chlorination. A reasonable potential analysis was conducted for cyanide. Please see Appendix C —
RPA Results. There was no reasonable potential to exceed. Therefore, a water quality -based effluent limitation was not
determined. Protection of Aquatic Life CCC = 5 pg/L, CMC = 22 µg/L, Background CN = 0.01 pg/L
See Appendix D for water quality based effluent limitation determination. Maximum daily limit of 39.1 µg/L and 12.6 µg/L.
The effluent limitation above is below the minimum quantification level (ML) of the most common and practical EPA approved
methods. The Department has determined that current acceptable ML for Cyanide, Amendable to Chlorination to be 16 µg/L
when using the Cyanide by Automated Colorimetric Method #335.3 from the U.S.EPA National Exposure Research Laboratory.
Therefore, the operating permit contains a Note 3 in Part A above indicating such.
---A reasonable potential analysis should be calculated upon the next renewal and Water Quality Based Effluent Limitations will
be removed if the facility shows no reasonable potential to violate water quality standards
• Chemical Omen Demand (CODI. Monitoring only. Effluent limitations have been retained from previous state operating
permit. Included as indication of performance of the facility and will be reviewed upon renewal of the permit.
• Total Phosphorus as P. Monitoring only. Effluent limitations have been retained from previous state operating permit.
Included as indication of performance of the facility and will be reviewed upon renewal of the permit.
▪ Total Nitrogen as N. Monitoring only. Effluent limitations have been retained from previous state operating permit.
Included as indication of performance of the facility and will be reviewed upon renewal of the permit.
• Nitrite/Nitrate. Monitoring only. Effluent limitations have been retained from previous state operating permit. A reasonable
potential analysis was conducted for nitrates. Included as an indication of performance of the facility and will be reviewed upon
renewal of the facility. Please see Appendix C — RPA Results. There was no reasonable potential to exceed. Therefore, a water
quality -based effluent limitation was not determined.
15
Metals
Effluent limitations for total recoverable metals were developed using methods and procedures outlined in the "Technical Support
Document For Water Quality -based Toxic Controls" (EPA/505/2-90-001) and "The Metals Translator: Guidance For Calculating A
Total Recoverable Permit Limit From A Dissolved Criterion" (EPA 823-B-96-007). General warm -water fishery criteria apply and a
water hardness of 197mgL is used in the conversion below.
Due to the absence of contemporaneous effluent and instream data for total recoverable metals, dissolved metals, hardness, and total
suspended solids with which to calculate metals translators, partitioning between the dissolved and absorbed phases was assumed to
be minimal (Section 5.7.3, EPA/505/2-90-001). Freshwater criteria conversion factors for dissolved metals were used as the metals
translator as recommended in guidance (Section 1.3, 1.5.3, and Table 1, EPA 823-B-96-007). If concurrent site -specific data for total
recoverable metals, dissolved metals, hardness, and total suspended solids are provided to the Department, partitioning evaluations
may be considered and site -specific translators developed.
METAL
CONVERSION
FACTORS
ACUTE f CI-MONLC
Cadmium
0.915 0.880
Chromium III
0.316 1 0.860
Copper
0.960
0.960
Lead
0.690
0.690
Nickel
0.998 j 0.997
Silver
0.850 N.A.
Zinc
0.980 , 0.980
Conversion factors for Cd and Pb are hardness dependent. Values calculated using equation found
in Section 1.3 of EPA 823-B-96-007 and hardness = 197 mg/L.
■ Arsenic, Total Recoverable. Effluent limitations have been retained from previous state operating permit. A reasonable
potential analysis was conducted for Arsenic. There was no reasonable potential to exceed. Please see Appendix C — RPA
Results. Therefore, the existing permit monitoring only requirements have been retained. A reasonable potential analysis should
be calculated upon the next renewal and Water Quality -Based Effluent Limitations imposed if the facility shows reasonable
potential to violate water quality standards.
▪ Cadmium, Total Recoverable. A reasonable potential analysis was conducted for Cadmium. Please see Appendix C — RPA
Results. There was reasonable potential to exceed. Therefore, a water quality -based effluent limitation was determined.
Protection of Aquatic Life CCC = 10 µg. L. CMC = 0.5 ggL, Background Cd = 0.01 gg/L
See Appendix D for water quality -based effluent limitation determination. Maximum daily limit of 7.8 gg.L and 2.7 gg/L.
---A reasonable potential analysis should be calculated upon the next renewal and Water Quality Based Effluent Limitations will
be removed if the facility shows no reasonable potential to violate water quality standards
• Chromium III, Total Recoverable. Effluent limitations have been retained from previous state operating permit. The previous
permit lists "chromium, total recoverable" instead of chromium III and chromium VI. Chromium III is the naturally occurring
composition of Chromium. A reasonable potential analysis was conducted for Chromium Ili using total chromium as
conservative estimate. There was no reasonable potential to exceed. Please see Appendix C — RPA Results. Therefore, the
existing permit monitoring only requirements have been retained for Chromium III. --- A reasonable potential analysis should be
calculated upon the next renewal and Water Quality Based Effluent Limitations imposed if the facility shows reasonable potential
to violate water quality standards.
• Chromium VI, Dissolved. Effluent limitations have been retained from previous state operating permit. The previous permit
Iists "chromium, total recoverable" instead of chromium 111 and chromium VI. The previous permit does not contain Chromium
VI. Because the reasonable potential analysis using assumed values for chromium HI and chromium IV did not have an
exceeding value, this parameter will be monitoring only. Please see Appendix C — RPA Results. ---A reasonable potential
analysis should be calculated upon the next renewal and Water Quality -Based Effluent Limitations imposed if the facility shows
reasonable potential to violate water quality standards.
_c
" C o p p e r . T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . S t a n c o n d u c t e d a
r e a s o n a b l e p o t e n t i a l a n a l y s i s o n C o p p e r a n d d e t e r m i n e d t h a t e f f l u e n t f r o m t h i s f a c i l i t y d o e s n o t h a v e p o t e n t i a l t o c a u s e o r
c o n t r i b u t e t o e x c u r s i o n s o f M i s s o u r i ' s W a t e r Q u a l i t y S t a n d a r d s . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e f o r e , e f f l u e n t
l i m i t a t i o n s a r e n o t a p p l i c a b l e .
" L e a d . T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e n o t b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . S t a f f c o n d u c t e d a
R P A o n L e a d a n d d e t e r m i n e d t h a t e f f l u e n t f r o m t h i s f a c i l i t y d o e s n o t h a v e p o t e n t i a l t o c a u s e o r c o n t r i b u t e t o e x c u r s i o n s o f
M i s s o u r i ' s W a t e r Q u a l i t y S t a n d a r d s . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e f o r e , e f f l u e n t l i m i t a t i o n s a r e n o t a p p l i c a b l e .
a M e r c u r y . T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . S t a f f c o n d u c t e d a
R P A o n M e r c u r y a n d d e t e r m i n e d t h a t e f f l u e n t f r o m t h i s f a c i l i t y d o e s n o t h a v e p o t e n t i a l t o c a u s e o r c o n t r i b u t e t o e x c u r s i o n s o f
M i s s o u r i ' s W a t e r Q u a l i t y S t a n d a r d s . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e f o r e , e f f l u e n t l i m i t a t i o n s a r e n o t a p p l i c a b l e . -
- - A r e a s o n a b l e p o t e n t i a l a n a l y s i s s h o u l d b e c a l c u l a t e d u p o n t h e n e x t r e n e w a l . P r o t e c t i o n o f A q u a t i c L i f e C C C = 2 . 4 � g / L , C M C
= 0 . 5 � g / L .
" N i c k e l , T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . S t a f f c o n d u c t e d a R P A
o n N i c k e l a n d d e t e r m i n e d t h a t e f f l u e n t f r o m t h i s f a c i l i t y d o e s n o t h a v e p o t e n t i a l t o c a u s e o r c o n t r i b u t e t o e x c u r s i o n s o f M i s s o u r i ' s
W a t e r Q u a l i t y S t a n d a r d s . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e f o r e , e f f l u e n t l i m i t a t i o n s a r e n o t a p p l i c a b l e .
" S i l v e r . T o t a l R e c o v e r a b l e . A r e a s o n a b l e p o t e n t i a l a n a l y s i s w a s c o n d u c t e d f o r s i l v e r . P l e a s e s e e A p p e n d i x C R P A R e s u l t s .
T h e r e w a s r e a s o n a b l e p o t e n t i a l t o e x c e e d . T h e r e f o r e , a w a t e r q u a l i t y - b a s e d e f f l u e n t l i m i t a t i o n w a s d e t e r m i n e d .
P r o t e c t i o n o f A q u a t i c L i f e C C C = n o t a p p l i c a b l e , C M C = 1 2 . 1 � g / L , B a c k g r o u n d A g = 0 . 0 1 p . g / L
S e e A p p e n d i x D f o r w a t e r q u a l i t y - b a s e d e f f l u e n t l i m i t a t i o n d e t e r m i n a t i o n . M a x i m u m d a i l y l i m i t o f 2 1 . 5 p g / L a n d 7 . 4 � g / L .
- - - R e a s o n a b l e p o t e n t i a l a n a l y s i s s h o u l d b e c a l c u l a t e d u p o n t h e n e x t r e n e w a l a n d W a t e r Q u a l i t y B a s e d E f f l u e n t L i m i t a t i o n s w i l l b e
r e m o v e d i f t h e f a c i l i t y s h o w s n o r e a s o n a b l e p o t e n t i a l t o v i o l a t e w a t e r q u a l i t y s t a n d a r d s
" Z i n c . T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . S t a f f c o n d u c t e d a R P A
o n Z i n c a n d d e t e r m i n e d t h a t e f f l u e n t f r o m t h i s f a c i l i t y d o e s n o t h a v e p o t e n t i a l t o c a u s e o r c o n t r i b u t e t o e x c u r s i o n s o f M i s s o u r i ' s
W a t e r Q u a l i t y S t a n d a r d s P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e f o r e , e f f l u e n t l i m i t a t i o n s a r e n o t a p p l i c a b l e .
" W E T T e s t . W E T T e s t i n g s c h e d u l e s a n d i n t e r v a l s a r e e s t a b l i s h e d i n a c c o r d a n c e w i t h t h e D e p a r t m e n t ' s P e r m i t M a n u a l ; S e c t i o n
5 . 2 E f f l u e n t L i m i t s / W E T T e s t i n g f o r C o m p l i a n c e B i o - m o n i t o r i n g . I t i s r e c o m m e n d e d t h a t W E T t e s t i n g b e c o n d u c t e d d u r i n g t h e
p e r i o d o f l o w e s t s t r e a m f l o w .
� A c u t e
N o l e s s t h a n T W I C E / Y E A R :
Q' F a c i l i t y i s s u b j e c t t o p r o d u c t i o n p r o c e s s e s a l t e r a t i o n s t h r o u g h o u t t h e y e a r .
� F a c i l i t y h a n d l e s l a r g e q u a n t i t i e s o f t o x i c s u b s t a n c e s , o r s u b s t a n c e s t h a t a r e t o x i c i n l a r g e a m o u n t s .
Q' F a c i l i t y h a s b e e n g r a n t e d s e a s o n a l r e l i e f o f n u m e r i c l i m i t a t i o n s .
A c u t e a n d / o r C h r o n i c A l l o w a b l e E f f l u e n t C o n c e n t r a t i o n s ( A E C s ) f o r f a c i l i t i e s t h a t d i s c h a r g e t o u n c l a s s i f i e d , C l a s s C , C l a s s P
( w i t h d e f a u l t M i x i n g C o n s i d e r a t i o n s ) , o r L a k e s ( 1 0 C S R 2 0 - 7 . 0 3 1 ( 4 ) ( A ) 4 . B . ( I V ) ( b ) 1 a r e 1 0 0 % , 5 0 % , 2 5 % , 1 2 . 5 % , & 6 . 2 5 % .
( C l a s s i f i e d P w i t h o t h e r t h a n d e f a u l t M i x i n g C o n s i d e r a t i o n s , t h e A E C % i s d e t e r m i n e d a s f o l l o w s : .
O u t f a l l 0 0 1 - - A c u t e A E C % = ( ( d e s i g n f l o w , e + Z I D , Q I o ) / d e s i g n f l o w c a ) ' ' ] x 1 0 0 =
O u t f a l l 0 0 2 - - A c u t e A E C % = ( ( d e s i g n f l o w c s + Z I D 7 Q I o ) / d e s i g n f l o w s J 1 ] x 1 0 0 =
" T o t a l T o x i c O r g a n i c s . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . M u s t s a m p l e p a r a m e t e r s
f o u n d a b o v e i n N o t e 2 a b o v e . R e t a i n e d b e c a u s e o f M S D ' s p o t e n t i a l f o r t o x i c o r g a n i c s t o b e r e c e i v e d a s i n f l u e n t f r o m i n d u s t r i a l
a n d h a z a r d o u s w a s t e r e m e d i a t i o n s i t e s .
" M i n i m u m S a m p l i n g a n d R e p o r t i n g F r e a u e n c v R e a u i r e m e n t s _ S a m p l i n g a n d r e p o r t i n g f r e q u e n c y r e q u i r e m e n t s h a v e b e e n
r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . I n a c c o r d a n c e w i t h 1 0 C S R 2 0 - 7 . 0 1 5 ( 2 ) ( C ) 1 , t h e D e p a r t m e n t h a s d e v e l o p e d a
m i n i m u m s a m p l i n g b a s e d o n t h i s f a c i l i t y ' s d e s i g n f l o w ( D F ) . E . r o l l m o n i t o r i n g f r e q u e n c y i s i n a c c o r d a n c e w i t h 1 0 C S R 2 0 -
7 . 0 1 5 ( 2 ) ( C ) 1 . D .
D F = 1 6 7 M G D = 1 6 7 , 0 0 0 , 0 0 0 g p d - 5 0 , 0 0 0 g p d / s a m p l e p e r y e a r = 3 , 3 4 0 s a m p l e s p e r y e a r
3 , 3 4 0 s a m p l e s p e r y e a r = 1 2 m o n t h s p e r y e a r = 2 7 8 s a m p l e s p e r m o n t h
2 7 8 s a m p l e s p e r m o n t h .
�%l
1 7
OUTFALL #002- DERIVATION AND DISCUSSION OF LIMITS:
• Flow. In accordance with [40 CFR Part 122.44(i)(1)(ii)] the volume of effluent discharged from each outfall is needed to assure
compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of
the permittee to inform the department, which may require the submittal of an operating permit modification.
• Biochemical Ox en Demand ODD . Effluent limitations have been retained from previous state operating permit, please see
the APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information. During this
CORMIX mixing zone review process, EPA did not agree with the use of 5-day carbonaceous biochemical oxygen demand
(CBOD5). Therefore, while past permits have had CBOD5, the 2007-revised permit had 5-day BOD. The facility must
demonstrate that enough nitrification of ammonia is taking place before this allowance can be granted. MSD may petition and
submit data to the department to obtain CBOD.5 effluent limitations of 25 mg/L monthly average, 40 mg/L weekly average per 10
CSR 20-7.015(2)(A)6.
• Total Suspended Solids (TSS). Effluent limitations have been retained from previous state operating permit, please see the
APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information.
• M. Effluent limitations have been modified from previous state operating permit, to 6.5-9.0 SU per 10 CSR 20-7.015(2)(A)2,
please see the APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information.
• Oil & Grease. Effluent limitations have been retained from previous state operating permit. Conventional pollutant, effluent
limitation for protection of aquatic Iife; 10 mgL monthly average, 15 mg/L daily maximum.
• Escherichia coli (E. coli). The Monthly Average limit is 1,134 per 100 ml as a geometric mean during the recreational season
(April 1— October 31) to protect Secondary Contact Recreation (SCR) designated use of the receiving stream, as per 10 CSR 20-
7.031(4)(C). Weekly monitoring is required to determine compliance pursuant to 10 CSR 20-7.031(4)(C). The effluent
variability may be used for development of future effluent limits to protect the SCR designated use this waterbody. Development
of a weekly average limitation pursuant to the federal regulation 40 CFR 122.45(d) is not practicable at this time.
The facility- has no disinfection capabilities; therefore the discharge cannot immediately comply with a water quality -based
effluent limitation (WQBEL). A schedule of compliance is appropriate and will lead to compliance with the final WQBEL as
soon as possible.
• Total Ammonia Nitrogen. Early Life Stages Present Total Ammonia Nitrogen criteria apply [10 CSR 20-7.031(4)(B)7.C. &
Table B3] default pH 7.8 SU. A reasonable potential analysis was conducted for ammonia. Please see Appendix C — RPA
Results. There was no reasonable potential to exceed. Therefore, a water quality -based effluent limitation was not determined.
• Total Residual Chlorine (TRC]. Warm -water Protection of Aquatic Life CCC = 10 µg/L, CMC = 19 µg/L [10 CSR 20-7.031,
Table A]. Background TRC = 0.0 µgL.
Ce=(((Qe-t-Qs)*C) - (Qs*Cs))/Qe
Chronic WLA: Ce = ((2.8 7951.6)10 — (7951.6 * 0.0))/2.8
Ce = 28,408 µgL
Acute WLA: Ce = ((2.8 + 795.2)19 — (795.2 * 0.0))/2.8
Ce = 5,415 µg;L
LTA, = 28,408 (0.527) = 14,971 µg L [CV = 0.6, 99a' Percentile]
LTA, = 5,415 (0.321) = 1,738.2 µg/L [CV = 0.6, 99' Percentile]
Use most protective number of LTA, or LTAa.
MDL = 1,738 (3.11) = 5,405 µg/L
AML = 1,738 (1.55) = 2,694 µg/L
[CV = 0.6, 99th Percentile]
[CV = 0.6, 95th Percentile, n = 4]
Total Residual Chlorine effluent limits of 5.4 mg/L daily maximum, 2.7 mg/L monthly average are recommended if
chlorine is used as a disinfectant. Standard compliance language for TRC, including the minimum level (MI..), should be
included in the permit. Not applicable for this outfall given the limitations.
-8
" O i l & G r e a s e . C o n v e n t i o n a l p o l l u t a n t , e f f l u e n t l i m i t a t i o n f o r p r o t e c t i o n o f a q u a t i c l i f e ; 1 0 m g / L m o n t h l y a v e r a g e , 1 5 m g / L d a i l y
m a x i m u m .
" C y a n i d e , A m e n a b l e t o C h l o r i n a t i o n . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . A r e a s o n a b l e
p o t e n t i a l a n a l y s i s w a s c o n d u c t e d f o r c y a n i d e , P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e w a s n o r e a s o n a b l e p o t e n t i a l t o
e x c e e d . T h e r e f o r e , a w a t e r q u a l i t y - b a s e d e f f l u e n t l i m i t a t i o n w a s n o t d e t e r m i n e d . S e e N o t e 3 i n P a r t A .
" _ C h e m i c a l O a v e e n D e m a n d ( C O D ) . M o n i t o r i n g o n l y . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g
p e r m i t .
" T o t a l P h o s p h o r u s a s P . M o n i t o r i n g o n l y . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t .
" T o t a l N i t r o e e n a s N . M o n i t o r i n g o n l y . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t .
" N i t r i t e / N i t r a t e . M o n i t o r i n g o n l y . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . A r e a s o n a b l e
p o t e n t i a l a n a l y s i s w a s c o n d u c t e d f o r n i t r a t e s . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e w a s n o r e a s o n a b l e p o t e n t i a l t o
e x c e e d . T h e r e f o r e , a w a t e r q u a l i t y - b a s e d e f f l u e n t l i m i t a t i o n w a s n o t d e t e r m i n e d .
M e t a l s
E f f l u e n t l i m i t a t i o n s f o r t o t a l r e c o v e r a b l e m e t a l s w e r e d e v e l o p e d u s i n g m e t h o d s a n d p r o c e d u r e s o u t l i n e d i n t h e " T e c h n i c a l S u p p o r t
D o c u m e n t F o r W a t e r Q u a l i t y - b a s e d T o x i c C o n t r o l s " ( E P A / 5 0 5 / 2 - 9 0 - 0 0 1 ) a n d " T h e M e t a l s T r a n s l a t o r : G u i d a n c e F o r C a l c u l a t i n g A
T o t a l R e c o v e r a b l e P e r m i t L i m i t F r o m A D i s s o l v e d C r i t e r i o n " ( E P A 8 2 3 - B - 9 6 - 0 0 7 ) . G e n e r a l w a r m - w a t e r f i s h e r y c r i t e r i a a p p l y a n d a
w a t e r h a r d n e s s o f 1 9 7 m g / L i s u s e d i n t h e c o n v e r s i o n b e l o w .
D u e t o t h e a b s e n c e o f c o n t e m p o r a n e o u s e f f l u e n t a n d i n s t r e a m d a t a f o r t o t a l r e c o v e r a b l e m e t a l s , d i s s o l v e d m e t a l s , h a r d n e s s , a n d t o t a l
s u s p e n d e d s o l i d s w i t h w h i c h t o c a l c u l a t e m e t a l s t r a n s l a t o r s , p a r t i t i o n i n g b e t w e e n t h e d i s s o l v e d a n d a b s o r b e d p h a s e s w a s a s s u m e d t o
b e m i n i m a l ( S e c t i o n 5 . 7 . 3 , E P A / 5 0 5 / 2 - 9 0 - 0 0 1 ) . F r e s h w a t e r c r i t e r i a c o n v e r s i o n f a c t o r s f o r d i s s o l v e d m e t a l s w e r e u s e d a s t h e m e t a l s
t r a n s l a t o r a s r e c o m m e n d e d i n g u i d a n c e ( S e c t i o n 1 . 3 , 1 . 5 . 3 , a n d T a b l e 1 , E P A 8 2 3 - B - 9 6 - 0 0 7 ) . I f c o n c u r r e n t s i t e - s p e c i f i c d a t a f o r t o t a l
r e c o v e r a b l e m e t a l s , d i s s o l v e d m e t a l s , h a r d n e s s , a n d t o t a l s u s p e n d e d s o l i d s a r e p r o v i d e d t o t h e D e p a r t m e n t , p a r t i t i o n i n g e v a l u a t i o n s
m a y b e c o n s i d e r e d a n d s i t e - s p e c i f i c t r a n s l a t o r s d e v e l o p e d .
M E T A L
C O N V E R S I O N
F A C T O R S
A C U T E
C H R O N I C
C a d m i u m
0 . 9 1 5
0 . 8 8 0
C h r o m i u m I I I
0 . 3 1 6
0 . 8 6 0
C o p p e r
0 . 9 6 0
0 . 9 6 0
L e a d
0 . 6 9 0
0 . 6 9 0
N i c k e l
0 . 9 9 8
0 . 9 9 7
S i l v e r
0 . 8 5 0
N . A .
Z i n c
0 . 9 8 0
0 . 9 8 0
C o n v e r s i o n f a c t o r s f o r C d a n d P b a r e h a r d n e s s d e p e n d e n t . V a l u e s c a l c u l a t e d u s i n g e q u a t i o n f o u n d
i n S e c t i o n 1 . 3 o f E P A 8 2 3 - B - 9 6 - 0 0 7 a n d h a r d n e s s = 1 9 7 m g / L .
" A r s e n i c , T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . A r e a s o n a b l e
p o t e n t i a l a n a l y s i s w a s c o n d u c t e d f o r a r s e n i c . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e w a s n o r e a s o n a b l e p o t e n t i a l t o
e x c e e d . T h e r e f o r e , t h e e x i s t i n g p e r m i t m o n i t o r i n g o n l y r e q u i r e m e n t s h a v e b e e n r e t a i n e d . A r e a s o n a b l e p o t e n t i a l a n a l y s i s s h o u l d
b e c a l c u l a t e d u p o n t h e n e x t r e n e w a l a n d W a t e r Q u a l i t y B a s e d E f f l u e n t L i m i t a t i o n s i m p o s e d i f t h e f a c i l i t y s h o w s r e a s o n a b l e
p o t e n t i a l t o v i o l a t e w a t e r q u a l i t y s t a n d a r d s .
" C a d m i u m . T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . A r e a s o n a b l e
p o t e n t i a l a n a l y s i s w a s c o n d u c t e d f o r c a d m i u m . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e w a s n o r e a s o n a b l e p o t e n t i a l t o
e x c e e d . T h e r e f o r e , t h e e x i s t i n g p e r m i t m o n i t o r i n g o n l y r e q u i r e m e n t s h a v e b e e n r e t a i n e d . A r e a s o n a b l e p o t e n t i a l a n a l y s i s s h o u l d
b e c a l c u l a t e d u p o n t h e n e x t r e n e w a l a n d W a t e r Q u a l i t y B a s e d E f f l u e n t L i m i t a t i o n s i m p o s e d i f t h e f a c i l i t y s h o w s r e a s o n a b l e
p o t e n t i a l t o v i o l a t e w a t e r q u a l i t y s t a n d a r d s .
1 9
" C h r o m i u m I I I . T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . T h e p r e v i o u s
p e r m i t L i s t s " c h r o m i u m , t o t a l r e c o v e r a b l e " i n s t e a d o f c h r o m i u m I I I a n d c h r o m i u m V I . C h r o m i u m I I I i s t h e n a t u r a l l y o c c u r r i n g
c o m p o s i t i o n o f C h r o m i u m . A r e a s o n a b l e p o t e n t i a l a n a l y s i s w a s c o n d u c t e d f o r C h r o m i u m I I I u s i n g t o t a l c h r o m i u m a s
c o n s e r v a t i v e e s t i m a t e . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e w a s n o r e a s o n a b l e p o t e n t i a l t o e x c e e d . T h e r e f o r e , t h e
e x i s t i n g p e r m i t m o n i t o r i n g o n l y r e q u i r e m e n t s h a v e b e e n r e t a i n e d f o r C h r o m i u m I I I . A r e a s o n a b l e p o t e n t i a l a n a l y s i s s h o u l d b e
c a l c u l a t e d u p o n t h e n e x t r e n e w a l a n d W a t e r Q u a l i t y B a s e d E f f l u e n t L i m i t a t i o n s i m p o s e d i f t h e f a c i l i t y s h o w s r e a s o n a b l e p o t e n t i a l
t o v i o l a t e w a t e r q u a l i t y s t a n d a r d s .
" C h r o m i u m V I , D i s s o l v e d . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . T h e p r e v i o u s p e r m i t
l i s t s " c h r o m i u m , t o t a l r e c o v e r a b l e " i n s t e a d o f c h r o m i u m 1 1 1 a n d c h r o m i u m V I . T h e p r e v i o u s p e r m i t d o e s n o t c o n t a i n C h r o m i u m
V I . B e c a u s e t h e r e a s o n a b l e p o t e n t i a l a n a l y s i s u s i n g a s s u m e d v a l u e s f o r c h r o m i u m I I I a n d c h r o m i u m I V d i d n o t h a v e a n
e x c e e d i n g v a l u e , t h i s p a r a m e t e r w i l l b e m o n i t o r i n g o n l y . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . A r e a s o n a b l e p o t e n t i a l
a n a l y s i s s h o u l d b e c a l c u l a t e d u p o n t h e n e x t r e n e w a l a n d W a t e r Q u a l i t y B a s e d E f f l u e n t L i m i t a t i o n s i m p o s e d i f t h e f a c i l i t y s h o w s
r e a s o n a b l e p o t e n t i a l t o v i o l a t e w a t e r q u a l i t y s t a n d a r d s .
" C o n n e r . T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . S t a f f c o n d u c t e d a
r e a s o n a b l e p o t e n t i a l a n a l y s i s o n C o p p e r a n d d e t e r m i n e d t h a t e f f l u e n t f r o m t h i s f a c i l i t y d o e s n o t h a v e p o t e n t i a l t o c a u s e o r
c o n t r i b u t e t o e x c u r s i o n s o f M i s s o u r i ' s W a t e r Q u a l i t y S t a n d a r d s . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e f o r e , e f f l u e n t
l i m i t a t i o n s a r e n o t a p p l i c a b l e .
�% L e a d . T o t a l R e c o v e r a b l e . E f f l u e n t I i m i t a t i o n s h a v e n o t b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . S t a f f c o n d u c t e d a
R P A o n L e a d a n d d e t e r m i n e d t h a t e f f l u e n t f r o m t h i s f a c i l i t y d o e s n o t h a v e p o t e n t i a l t o c a u s e o r c o n t r i b u t e t o e x c u r s i o n s o f
M i s s o u r i ' s W a t e r Q u a l i t y S t a n d a r d s . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e f o r e , e f f l u e n t l i m i t a t i o n s a r e n o t a p p l i c a b l e .
" M e r c u r y , T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . A r e a s o n a b l e
p o t e n t i a l a n a l y s i s w a s c o n d u c t e d f o r M e r c u r y . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e w a s n o r e a s o n a b l e p o t e n t i a l t o
e x c e e d . T h e r e f o r e , t h e e x i s t i n g p e r m i t m o n i t o r i n g o n l y r e q u i r e m e n t s h a v e b e e n r e t a i n e d . A r e a s o n a b l e p o t e n t i a l a n a l y s i s s h o u l d
b e c a l c u l a t e d u p o n t h e n e x t r e n e w a l a n d W a t e r Q u a l i t y B a s e d E f f l u e n t L i m i t a t i o n s i m p o s e d i f t h e f a c i l i t y s h o w s r e a s o n a b l e
p o t e n t i a l t o v i o l a t e w a t e r q u a l i t y s t a n d a r d s .
" N i c k e l , T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . S t a f f c o n d u c t e d a R P A
o n N i c k e l a n d d e t e r m i n e d t h a t e f f l u e n t f r o m t h i s f a c i l i t y d o e s n o t h a v e p o t e n t i a l t o c a u s e o r c o n t r i b u t e t o e x c u r s i o n s o f M i s s o u r i ' s
W a t e r Q u a l i t y S t a n d a r d s . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e f o r e , e f f l u e n t l i m i t a t i o n s a r e n o t a p p l i c a b l e .
" S i l v e r , T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . A r e a s o n a b l e p o t e n t i a l
a n a l y s i s w a s c o n d u c t e d f o r A r s e n i c . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e w a s n o r e a s o n a b l e p o t e n t i a l t o e x c e e d .
T h e r e f o r e , t h e e x i s t i n g p e r m i t m o n i t o r i n g o n l y r e q u i r e m e n t s h a v e b e e n r e t a i n e d . A r e a s o n a b l e p o t e n t i a l a n a l y s i s s h o u l d b e
c a l c u l a t e d u p o n t h e n e x t r e n e w a l a n d W a t e r Q u a l i t y B a s e d E f f l u e n t L i m i t a t i o n s i m p o s e d i f t h e f a c i l i t y s h o w s r e a s o n a b l e p o t e n t i a l
t o v i o l a t e w a t e r q u a l i t y s t a n d a r d s .
" Z i n c . T o t a l R e c o v e r a b l e . E f f l u e n t l i m i t a t i o n s h a v e b e e n r e t a i n e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t . S t a f f c o n d u c t e d a R P A
o n Z i n c a n d d e t e r m i n e d t h a t e f f l u e n t f r o m t h i s f a c i l i t y d o e s n o t h a v e p o t e n t i a l t o c a u s e o r c o n t r i b u t e t o e x c u r s i o n s o f M i s s o u r i ' s
W a t e r Q u a l i t y S t a n d a r d s . P l e a s e s e e A p p e n d i x C R P A R e s u l t s . T h e r e f o r e , e f f l u e n t l i m i t a t i o n s a r e n o t a p p l i c a b l e .
" W E T T e s t . W E T T e s t i n g s c h e d u l e s a n d i n t e r v a l s a r e e s t a b l i s h e d i n a c c o r d a n c e w i t h t h e D e p a r t m e n t ' s P e r m i t M a n u a l ; S e c t i o n
5 . 2 E f f l u e n t L i m i t s . ' H E T T e s t i n g f o r C o m p l i a n c e B i o - m o n i t o r i n g . I t i s r e c o m m e n d e d t h a t W E T t e s t i n g b e c o n d u c t e d d u r i n g t h e
p e r i o d o f l o w e s t s t r e a m f l o w .
� A c u t e ( d e f a u l t )
�%f N o l e s s t h a n T W I C E / Y E A R :
Q' F a c i l i t y i s s u b j e c t t o p r o d u c t i o n p r o c e s s e s a l t e r a t i o n s t h r o u g h o u t t h e y e a r .
� F a c i l i t y - h a n d l e s l a r g e q u a n t i t i e s o f t o x i c s u b s t a n c e s , o r s u b s t a n c e s t h a t a r e t o x i c i n l a r g e a m o u n t s .
Q' F a c i l i t y - h a s b e e n g r a n t e d s e a s o n a l r e l i e f o f n u m e r i c l i m i t a t i o n s .
A c u t e a n d o r C h r o n i c A l l o w a b l e E f f l u e n t C o n c e n t r a t i o n s ( A E C s ) f o r f a c i l i t i e s t h a t d i s c h a r g e t o u n c l a s s i f i e d , C l a s s C , C l a s s P
( w i t h d e f a u l t M i x i n g C o n s i d e r a t i o n s ) , o r L a k e s [ 1 0 C S R 2 0 - 7 . 0 3 1 ( 4 ) ( A ) 4 . B . ( I V ) ( b ) ] a r e 1 0 0 % , 5 0 % , 2 5 % , 1 2 . 5 % , & 6 . 2 5 % .
( C l a s s i f i e d P w i t h o t h e r t h a n d e f a u l t M i x i n g C o n s i d e r a t i o n s , t h e A E C % i s d e t e r m i n e d a s f o l l o w s : .
O u t f a l l 0 0 1 - - A c u t e A E C % = ( ( d e s i g n f l o w s , Z I D 7 Q 1 0 ) ' d e s i g n f l o w d e ) - ' ] x 1 0 0 =
O u t f a l l 0 0 2 - - A c u t e A E C % = ( ( d e s i g n f l o w Z I D 7 Q I o ) ' d e s i g n f l o w s $ ) ' ] x 1 0 0 =
2 0
- Total Toxic Organics. Effluent limitations have been retained from previous state operating permit. Must sample parameters
found above in Note 2 above. Retained because of MSD's potential for toxic organics to be received as influent from industrial
and hazardous waste remediation sites.
▪ Minimum Sampling and Reporting Frequency Requirements. Sampling and reporting frequency requirements have been
retained from previous state operating permit. In accordance with 10 CSR 20-7.015(2)(C), the Department has developed a
minimum sampling based on this facility's design flow (DF)..& coda monitoring frequency is in accordance with 10 CSR 20-
7.015(2)(C)1.D.
DF = 1.8 MGD 1,800,000 gpd = 50,000 gpd/ sample per year = 36 samples per year
36 samples per year =12 months per year = 3 samples per month
3 samples per month.
Outfall #003-007 — Storm water run-off from tacuity grounds
_+' - V -- -
PARAMETER
UST
BASIS
FOR
LmirrS
DAILY
MAXIMUM
WEEKLY
AVERAGE
MONTHLY
AVERAGE
MOD�tEo
PREVIOUS PERMIT
LIMLTATIONS
FLOW
GPD
1
*
*
No
BOD5
MG/L
1 /9
*
*
YES
45/30
TSS
MG/L
1 / 9
*
*
YES/NEW
Nor
APPPLICABLE
SETTLEABLE SOLIDS
MIJL/ER
9
*
*
YES
1.5/1.0
PH
SU
9
*
*
YES
6.0 — 9.0
OIL & GREASE (MG/L)
MG/L
9
*
*
YES
15/10
MONrrORING FREQUENCY
Please see Minimum Sampling and Reporting Frequency Requirements in the Derivation and
Discussion Section below.
* - Monitoring requirement only.
**** - Please see Derivation and Discussion Section Below.
Basis for Limitations Codes:
1. State or Federal Regulation/Law
2. Water Quality Standard (includes RPA)
3. Water Quality Based Effluent Limits
4. Lagoon Policy
5. Ammonia Policy
6. Dissolved Oxygen Policy
7. Antidegradation Policy
8. Water Quality Model
9. Best Professional Judgment
10. TMDL or Permit in,lieu of TMDL
11. WET Test Policy
12. Antidegradation Review
OUTFALL #003-007 — DERIVATION AND DISCUSSION OF LIMTTS:
• Flow. In accordance with [40 CFR Part 122.44(i)(1)(ii)] the volume of effluent discharged from each outfall is needed to assure
compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of
the permittee to inform the department, which may require the submittal of an operating permit modification.
• Biochemical Oxygen Demand (BOD4 The discharge monitoring data indicate that BMPs have been successfully implemented
as per the SWPPP for the facility; therefore, limitations are removed from previous state operating permit.
See APPLICABLE DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information.
• Total Suspended Solids {TSS). The discharge monitoring data indicate that BMPs have been successfully implemented as per
the SWPPP for the facility; therefore, limitations are removed from previous state operating permit. See APPLICABLE
DESIGNATION OF WATERS OF THE STATE sub -section of the Receiving Stream Information.
• p . The discharge monitoring data indicate that BMPs have been successfully implemented as per the SWPPP for the facility;
therefore, limitations are removed from previous state operating permit.
• Settleable Solids. The discharge monitoring data indicate that BMPs have been successfully implemented as per the SWPPP for
the facility; therefore, limitations are removed from previous state operating permit.
21
" O i l & G r e a s e . T h e d i s c h a r g e m o n i t o r i n g d a t a i n d i c a t e t h a t B M P s h a v e b e e n s u c c e s s f u l l y i m p l e m e n t e d a s p e r t h e S W P P P f o r t h e
f a c i l i t y ; t h e r e f o r e , l i m i t a t i o n s a r e r e m o v e d f r o m p r e v i o u s s t a t e o p e r a t i n g p e r m i t .
" M i n i m u m S a m u l i n u a n d R e p o r t i n s F r e a u e n c v R e q u i r e m e n t s . T h e p r e v i o u s l y e s t a b l i s h e d m i n i m u m m o n i t o r i n g r e q u i r e m e n t
w i l l b e r e t a i n e d ; h o w e v e r , t h e n e w p e r m i t w i l l a l l o w f o r s a m p l i n g i n a n y m o n t h o f a s a m p l i n g q u a r t e r a n d n o t p e r t h e p r e v i o u s
s t a t e o p e r a t i n g p e r m i t e s t a b l i s h e d m o n t h r e g i m e n t .
P A R T V I : F i n d i n g o f A f f o r d a b i l i t y
P u r s u a n t t o S e c t i o n 6 4 4 . 1 4 5 , R S M o . , t h e D e p a r t m e n t i s r e q u i r e d t o d e t e r m i n e w h e t h e r a p e r m i t o r d e c i s i o n i s a f f o r d a b l e a n d m a k e s a
f i n d i n g o f a f f o r d a b i l i t y f o r c e r t a i n p e r m i t t i n g a n d e n f o r c e m e n t d e c i s i o n s . T h i s r e q u i r e m e n t a p p l i e s t o d i s c h a r g e s f r o m c o m b i n e d o r
s e p a r a t e s a n i t a r y s e w e r s y s t e m s o r p u b l i c a l I y - o w n e d t r e a t m e n t w o r k s .
A p p l i c a b l e ; T h e D e p a r t m e n t i s r e q u i r e d t o d e t e r m i n e f i n d i n g s o f a f f o r d a b i l i t y b e c a u s e t h e p e r m i t a p p l i e s t o a c o m b i n e d o r
s e p a r a t e s a n i t a r y s e w e r s y s t e m f o r a p u b l i c a l l y - o w n e d t r e a t m e n t w o r k s .
F i n d i n g o f a f f o r d a b i l i t y - T h e d e p a r t m e n t h a s m a d e a r e a s o n a b l e s e a r c h f o r e m p i r i c a l d a t a i n d i c a t i n g t h e p e r m i t i s a f f o r d a b l e . T h e
s e a r c h c o n s i s t e d o f a r e v i e w o f d e p a r t m e n t r e c o r d s t h a t m i g h t c o n t a i n e c o n o m i c d a t a o n t h e c o m m u n i t y , a r e v i e w o f i n f o r m a t i o n
p r o v i d e d b y t h e a p p l i c a n t a s p a r t o f t h e a p p l i c a t i o n , a n d p u b l i c c o m m e n t s r e c e i v e d i n r e s p o n s e t o p u b l i c n o t i c e s o f t h i s d r a f t p e r m i t . I f
t h e e m p i r i c a l c o s t d a t a w a s u s e d b y t h e p e r m i t w r i t e r , t h i s d a t a m a y c o n s i s t o f m e d i a n h o u s e h o l d i n c o m e , a n y o t h e r o n g o i n g p r o j e c t s
t h a t t h e D e p a r t m e n t h a s k n o w l e d g e , a n d o t h e r d e m o g r a p h i c f i n a n c i a l i n f o r m a t i o n t h a t t h e c o m m u n i t y p r o v i d e d a s c o n t e m p l a t e d b y
S e c t i o n 6 4 4 . 1 4 5 . 3 .
T h e d e p a r t m e n t i s h e r e b y m a k i n g a f i n d i n g b a s e d f r o m t h e f o l l o w i n g f a c t s :
Q' 1 ) T h e a p p l i c a n t s t a t e s t h a t t h e t e r m s a n d c o n d i t i o n s a r e a f f o r d a b l e f o r t h e c o m m u n i t y .
O R ; T h i s p e r m i t a c t i o n w a s t a k e n a t t h e d i s c r e t i o n o f t h e f a c i l i t y , t h e r e f o r e t h e d e p a r t m e n t a s s u m e s t h e a p p l i c a n t a l r e a d y d e t e r m i n e d i t
i s a f f o r d a b l e ;
Q' 2 ) T h e p e r m i t a c t i o n i s t a k e n a t t h e d i s c r e t i o n o f t h e s y s t e m i t s e l f ( e . g . , s e w e r e x t e n s i o n c o n s t r u c t i o n p e r m i t s , o r t h e r e l o c a t i o n o f
a n o u t f a l l i n l i e u o f o t h e r w i s e u p g r a d i n g a s y s t e m i n o r d e r t o c o m p l y w i t h a p e r m i t i s s u e d p r i o r t o J u l y 1 1 , 2 0 1 1 ) ;
Q' 3 ) T h i s p e r m i t c o n t a i n s n o n e w o r e x p a n d e d t e r m s a n d c o n d i t i o n s ;
Q' 4 ) T h e d e p a r t m e n t i s n o t a w a r e o f a n y s i g n i f i c a n t e c o n o m i c i m p a c t s t h i s p e r m i t w o u l d c a u s e o n d i s t r e s s e d p o p u l a t i o n s ;
Q' 5 ) N o c o m m e n t s i n d i c a t i n g s u c h i m p a c t w e r e r e c e i v e d d u r i n g t h e p u b l i c c o m m e n t p e r i o d o n t h e d r a f t p e r m i t
Q' 6 ) T h e d e p a r t m e n t i s n o t a w a r e o f a n y o t h e r m o r e c o s t e f f e c t i v e w a s t e w a t e r t r e a t m e n t o p t i o n s t h a t w o u l d a c h i e v e t h e r e q u i r e d
e f f l u e n t q u a l i t y ;
Q' 7 ) T h e F a c i l i t y P l a n o n t h e c o n s t r u c t i o n p e r m i t c o n t a i n e d a n a f f o r d a b i l i t y f i n d i n g ;
Q' 8 ) T h e a p p l i c a n t p r o v i d e d i n c r e a s e d e f f l u e n t d i s c h a r g e m o n i t o r i n g c o s t s d u e t o e x p a n d e d m o n i t o r i n g f r e q u e n c y f o r c e r t a i n p e r m i t
p a r a m e t e r s ;
Q' 9 ) A n a f f o r d a b i l i t y a n a l y s i s w a s p e r f o r m e d a s p a r t o f t h e L o n g T e r m C o n t r o l P l a n o n C o m b i n e d S e w e r O v e r f l o w s ;
Q' 1 0 ) A n a f f o r d a b i l i t y a n a l y s i s w a s p e r f o r m e d a s p a r t o f a n A n t i - d e g r a d a t i o n R e v i e w D e t e r m i n a t i o n ;
Q' 1 1 ) T h e a p p l i c a n t h a s e n t e r e d i n t o a V o l u n t a r y C o m p l i a n c e A g r e e m e n t ( V C A ) f o r t h e p u r p o s e o f e l i m i n a t i n g i n f l o w a n d
i n f i l t r a t i o n i n t o t h e p l a n t . T h e a p p l i c a n t e n t e r e d i n t o t h e V C A a f t e r d u e c o n s i d e r a t i o n , t h e r e f o r e t h e d e p a r t m e n t a s s u m e s t h a t t h e
a p p l i c a n t h a s d e t e r m i n e d i t i s a f f o r d a b l e .
Q' 1 2 ) T h e a p p l i c a n t i s n e g o t i a t i n g a n A m e n d e d C o n s e n t J u d g m e n t w h i c h a d d r e s s e s e l i m i n a t i n g i n f l o w a n d i n f i l t r a t i o n s i n t o t h e
p l a n t , a s w e l l a s f u t u r e u n a u t h o r i z e d d i s c h a r g e s f r o m t h e f a c i l i t y ' s p e a k f l o w c l a r i f i e r . T h i s A m e n d e d C o n s e n t J u d g m e n t w i l l e s t a b l i s h
a s c h e d u l e t o a d d r e s s t h e s e i s s u e s t a k i n g i n t o c o n s i d e r a t i o n a f f o r d a b i l i t y .
F i n a l a n d i n t e r i m e f f l u e n t l i m i t a t i o n s h a v e b e e n e s t a b l i s h e d i n t h i s p e r m i t f o r v a r i o u s m e t a l s . A d d i t i o n a l t r e a t m e n t t o a t t a i n
c o m p l i a n c e w i t h f i n a l l i m i t a t i o n s s h o u l d n o t b e n e c e s s a r y g i v e n t h e f a c t t h a t t h e c i t y h a s a n a p p r o v e d p r e t r e a t m e n t p r o g r a m t o
e s t a b l i s h l o c a l i z e d l i m i t a t i o n s o n i n d u s t r i a l d i s c h a r g e r s o f t h e f a c i l i t y . B e c a u s e s u c h m e t a l s l i m i t a t i o n s a r e n o t e x p e c t e d t o c a u s e a n y
s i g n i f i c a n t i n c r e a s e s i n t h e c o s t o f o p e r a t i n g t h e W W T P , t h e D e p a r t m e n t f i n d s t h a t t h e r e i s s u a n c e o f t h i s p e r m i t i s a f f o r d a b l e p u r s u a n t
t o S e c t i o n 6 4 4 . 1 4 5 R S M o .
Q' 1 3 ) T h e a p p l i c a n t i s n e g o t i a t i n g a n A m e n d e d C o n s e n t J u d g m e n t w h i c h a d d r e s s e s e l i m i n a t i n g i n f l o w a n d i n f i l t r a t i o n s i n t o t h e
p l a n t , a s w e l l a s f u t u r e u n a u t h o r i z e d d i s c h a r g e s f r o m t h e f a c i l i t y ' s p e a k f l o w c l a r i f i e r . T h i s A m e n d e d C o n s e n t J u d g m e n t w i l l e s t a b l i s h
a s c h e d u l e t o a d d r e s s t h e s e i s s u e s t a k i n g i n t o c o n s i d e r a t i o n a f f o r d a b i l i t y .
F i n a l a n d i n t e r i m l i m i t a t i o n s h a v e b e e n e s t a b l i s h e d i n t h i s p e r m i t f o r E . c o l i . A d d i t i o n a l t r e a t m e n t t o a t t a i n c o m p l i a n c e w i t h f i n a l
l i m i t a t i o n s s h o u l d n o t b e n e c e s s a r y g i v e n t h e f a c t t h a t t h e f a c i l i t y h a s o z o n e d i s i n f e c t i o n a s p a r t o f i t s t r e a t m e n t t r a i n . B e c a u s e s u c h E .
c o l i l i m i t a t i o n s a r e n o t e x p e c t e d t o c a u s e a n y s i g n i f i c a n t i n c r e a s e s i n t h e c o s t o f o p e r a t i n g t h e W W T P , t h e D e p a r t m e n t f i n d s t h a t t h e
r e i s s u a n c e o f t h i s p e r m i t i s a f f o r d a b l e p u r s u a n t t o S e c t i o n 6 4 4 . 1 4 5 R S M o .
Q' 1 4 ) O t h e r s : e x p l a i n .
2 2
Section 644.145 of HB 89 as signed by the Governor on July 11, 2011, requires the Department to make a finding of affordability,
with respect to the community and its residents, in connection with the issuance of certain permits under the Missouri Clean Water
Law.
The financial capability of the Metropolitan St. Louis Sewer District (MSD) was considered in the Combined Sewer Overflow Long -
Term Control Plan Update Report, Revised February 2011 (Plan). The Lemay Wastewater Treatment Facility is part of a combined
sewer system and the financial capability analysis in the report included this facility's service area and the projected costs for known
projects at the time.
In addition, projects to improve the Lemay Wastewater Treatment Facility and the collection system will be required as part of the
federal consent decree No. 4:07-CV-1120(CEJ), which was lodged on August 4, 2011.
Part VI — Administrative Requirements
On the basis of preliminary staff review and the application of applicable standards and regulations, the Department, as administrative
agent for the Missouri Clean Water Commission, proposes to issue a permit(s) subject to certain effluent limitations, schedules, and
special conditions contained herein and within the operating permit. The proposed determinations are tentative pending public
comment.
PUBLIC NOTICE:
The Department shall give public notice that a draft permit has been prepared and its issuance is pending. Additionally, public notice
will be issued if a public hearing is to be held because of a significant degree of interest in and water quality concerns related to a draft
permit. No public notice is required when a request for a permit modification or termination is denied; however, the requester and
permittee must be notified of the denial in writing.
The Department must issue public notice of a pending operating permit or of a new or reissued statewide general permit. The public
comment period is the length of time not less than 30 days following the date of the public notice which interested persons may submit
written comments about the proposed permit.
For persons wanting to submit comments regarding this proposed operating permit, then please refer to the Public Notice page located
at the front of this draft operating permit. The Public Notice page gives direction on how and where to submit appropriate comments.
®- The Public Notice period for this operating permit was from December 2, 2011 to January 1, 2012. Responses to the Public
Notice of this operating permit warrant the modification of effluent limits and/or the terms and conditions of this permit. The
following changes were made to the draft operating permit in response to the comments.
• Page 2. Facility Descrintion. Outfall #002 states three lagoon cells receive ash and the final cell discharges. The three cells
operate in parallel and not in series.
The facility description for outfall #002 was revised as requested.
• Page 9, Final Effluent Limitations. Effluent limits for pH, Oil & Grease and Settable Solids on the stormwater outfalls, #003
through #007 should be removed from the permit.
The effluent limitations were removed. The permittee has a Stormwater Pollution Prevention Plan and the discharge monitoring data
indicate that the best management practices have been successfully implemented. Monitoring of the stormwater effluent will remain
in the permit The Fact Sheet was revised to reflect these changes.
Page 12, Special condition , Item 5. Item 5 requires that "Discharges to waters of the state shall not cause a violation of water
quality standards under 10 CSR 20-7.031, including both specific and general criteria." This requirement was requested to be
removed from the permit.
The Item 5 is retained with the language from the permit on public notice. The EPA did not feel that new language proposed by
Missouri Department of Natural Resources, Water Protection Program, adequately protected the General Criteria in the Water Quality
Standards, 10 CSR 20-7.031(3).
• Page 14. Special Conditions, Item 14. A request was made that detailed reporting for Sewer Extension Program be deleted and
that the records be available for review nn request
23
The detailed reporting requirements were deleted as requested. It appears that the submission of the detailed sewer extension reports
and a review by the Department of Natural Resources, Water Protection Program (Department) would not be practical due to the
volume on information generated. The revised permit requires that detailed project information and data shall remain available for
review by the Department on request.
• Page 18. Long Term Control Plan. The following language was requested to be added to the Special Conditions: `The permittee
shall implement and effectively operate and maintain the CSO controls identified in the Long Term control PIan dated February
2011 and approved by the Department on June 1, 2011."
The language was included in the permit as Special Condition, Item 24.
• Special Conditions. Blending Language. It was requested that this permit should clearly indicate that blending flow to combine
primary and secondary treatment capacities in a way that maximized treatment is permitted for this facility. The following
provision was suggested: "This permit allows for blending of secondary treated effluent with primary treated effluent only when
the secondary treatment capacity is exceeded. Permittee shall use the combined primary and secondary treatment capacities in a
way that maximizes treatment. In addition, the permittee should continue to implement and refine a program that maximizes the
capacity, management, operation, and maintenance (CMOM) of the collection system to assure the system is operated in a way
that minimizes peak flows during wet weather events."
The federal regulation for states in 40 CFR 122.41(m)(4)(ii) that "The Director may approve anticipated bypass, after considering its
adverse effects, if the Director determines that it will meet the three conditions listed above in paragraph (m)(4)(i) of this section".
One of the three conditions is that there is no feasible alternative to bypassing treatment. No determination that there is no feasible
alternative has been made; therefore this permit does not give prior approval of a bypass of treatment. Special Condition; Item 17 will
deauthorize bypasses of flows less that the secondary treatment capacity. The facility's secondary treatment capacity and the
operations and maintenance of the collection system are addressed in the Special Condition, Item 15, Nine Minimum Controls.
• Appendix A, Combined Sewer Overflow (CSO) Locations. The list of CSO outfalls in Appendix A was incorrect, and it was
requested that the current CSO locations be included in the permit.
The list of current CSO locations has been supplied in by MSD by a comment letter and emails from Mr. John Lodderhose of MSD.
The revised list is included in Appendix A.
DATE OF FACT SHEET: FEBRUARY 24, 2011,REvIsED 11, 22/2011,1/3/2012,1/20.1011
COMPLETED BY:
TODD BLANC, ENVIRONMENTAL SPECIALIST IV
WASTEWATER ENGINEERLNG UNIT
PERMITTING AND ENGINEERLNG SECTION
WATER PROTECTION PROGRAM
(573) 751-5827
TODD.BLANC LDNR.MO.GOV
Revised by:
WALTER FETT, ENVIRONMENTAL ENGINEER II
WASTEWATER ENGINEERING UNIT
PERMITTING AND ENGLNEERL G SECTION
WATER PROTECTION PROGRAM
(573) 526-4589
WALTER.FETT@DNR.MO.GOV
24
Part VII — Appendices
- (:T ASSIFICATION W ORIK5HFET:
. _ , .._-- -- 1
rEm
POINTS POSSIBLE
Poiwrs
Assiorma
Maximum Population Equivalent (P.E.) served (Max 10 pts.)
1 pt.I10,00D PE or major fraction
thereof.
10
Maximum: 10 pt Design Flow (avg. day) or peak month; use greater
(Max 10 pts.)
1 pt. / MGD or major fraction
thereof.
10
EFFLUENT DISCHARGE RECEIVING WATER SENSITIVITY
Missouri or Mississippi River
0
0
All other stream discharges except to losing streams and stream
reaches supporting whole body contact
1
Discharge to lake or reservoir outside of designated whole body
contact recreational area
2
Discharge to losing stream, or stream, lake or reservoir area
supporting whole body contact recreation
3
PRELIMINARY TREATMENT - Headworks
Screening and/or comminution
3
3
Grit removal
3
3
Plant pumping of main flow (lift station at the headworks)
3
3
PittMARY TREATM1:NT
Primary clarifiers
5
5
Combined sedimentation/digestion
5
Chemical addition (except chlorine, enzymes)
4
REQUIRED LABORATORY CONTROL — performed by plant personnel (highest level only)
Lab work conducted outside of plant
0
Push— button or visual methods for simple test such as pH,
Settleable solids
3
Additional procedures such as DO, COD, BOD, titration, solids,
volatile content
5
More advanced determinations such as BOD seeding procedures,
fecal coliform, nutrients, total oils, phenols, etc.
7
Highly sophisticated instrumentation, such as atomic absorption and
gas chromatoaph
10
10
ALTERNATIVE FATE OF EFFLUEN T
Direct reuse or recycle of effluent
6
Land Disposal — low rate
3
High rate
5
5
Overland flow
4
Total from page ONE (1)
---
49
25
Metropolitan St. Louis Sewer District (MSD)
LeMay WWTF
Fact Sheet
APPENDIX A - CLASSIFICATION R ORKSHEET (CONTINUED):
ITEM
POUTS POSSIBLE
Pons
ASSIONBD
YkRLATIO I RAW WASTE'(highest level only) (DMR exceedances and Design Flow exeeedances),
Variation do not exceed those normally or typically expected i 0
0
Recurring deviations or excessive va-iations of 100 to 200 %
stength ancl'or tiow
Recurring deviations or excessive variations of more than 2CG % in
strength and'o: flow
Raw wastes subject to toxic waste discharge
2
4
6
SECONDARY TREATMENT
Trickling niter and other fixed film media with secondary clarifiers
10
Activated sludge with secondary clarifiers (including extended
ae:atior. and oxidation ditches)
Stabilization ponds without aeration.
15
5
15
Aerated lagoon
8
Advanced Waste Treatment Polishing Pond
2
Chemicaitphysica — without secondary
15
Chemical/physical — following secondary
10
Biological or chemical/biological
12
Carbon regeneration
DISLVFEC:FION
Chlorination or comparable
5
Dechlorination
2
On -site generation of disinfectant (except UV light)
5
UV light
4
4
SOLIDS HANDLING SLUDGE.
Solids Handling Thickening
5
5
Anaerobic digestion
I0
Aerobic digestion
6
Evaporative sludge drying
2
Mechanical dewaterng
8
8
Solids reduction (incineration, wet oxidation)
12
12
Land application.
Total from page TWO (2),
Total from page ONE (1) ...
Grand Total
6
A : 71,points or greater
B: 51 points - 70 points
C 26 points - 50 points
r- D: 0 points - 25 points
26
APPENDIX B: PLOTS OF Low FLOW USING USGS GAGE STATION 07010000 (MISSISSIPPI RIVER AT ST. LOUIS)
100000
10000
7010 - Misslsslppi River at St Louts, MO
(USGS-07010000)
•
•
y = 103710x0
10
1000000
100000 •
10000
10
100000
10000
10.0
Recurrence Interval (years)
1Q10 - Mississippi River at St Louis, MO
(USGS-07010000)
y = 98048) 2923
100.0
10.0
Recurrence Interval (years)
30Q10 - Mississippi River at St. Louis, MO
(USGS-07010000)
•
MINIM
•1111
100.0
y = 115809)13°7e'
1.00
10 00
Recurrence Interval (years)
100.00
27
APPENDIX C - RPA RESULTS:
Reasonable Potential Analysis is conducted as per (TSD, EPA/505/2-90-001, Section 3.3.2). A more detailed version including
calculations of this RPA is available upon request.
Outfall #001- Low Flows not adiusted for results of mixing zone study.
Outfall #001 All values are total recoverable, except Cs for:
Classified P streams only Chromium VI
Facility Name DASD Lemay WWTF Qs = Stream 7010 flow (Rats), or 1410. or 30Q10
Permit Number MO-0025151 Qe = Effluent design Sow (flats)
Stream name Mississippi R. Qs 1010 = 50009.4 Cs = combined stream concentrations (see Footnote 1 below)
Qs 30Q10 = 57008.9 Ce = maximum effluent concentration
Qs 7010 = 54691_6 NA = not app. icable
Qe= 265.8
UNITS: Metals =
uglL; NO2, P,
mmonla, O&G =
mglL
mmonie (May-Cct)
mmonla ;Nov -Apr
Oil & Grease(O&G)
rsenic
Cadmium
Chromium Ili
Chromium VI
Copper
Cyanide
Lead
Nickel
NO2-NOS
Phosphorus (P)
Silver
nc
Aquatic Life
Acute (CO
12.1
12.1
10.0
3142.0
10.0
26.5
22.0
193.6
834.0
12.1
213.0
Footnotel :
Upstream concentration is assumed.
Assumptions and Basis:
Aquatic Llfe
Chronic (Cc)
1.5
3.1
10.0
20.0
0.5
212.0
0.5
13.9
5.0
7.5
92.6
0.0
193.0
Chronic
Drinking
Water
Standard CV
50
5
100
1300
15
100
10
50
5000
0.89
1.19
0.47
0.71
1.60
0.91
0.34
2.05
0.66
0.69
0.938
0.573
1.48
0.69
Maximum
Conc`tn
(Ce)
67.20
48.20
6.00
8.00
9.00
17.00
4.81
11.00
78.00
20.00
40.00
73
Upstream
WQ (CO'
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
2 0.01
10.59 0.01
30.00 0.01
160.00 0.01
RPTE
Calculation
216.12
201.93
9.09
21.13
50.25
55.36
6.59
18.26
552.88
49.82
104.25
24.62
23.88
155.42
416.01
C = (Ca * Qs) - (Ce * QE)
(Q, - Qf)
Receiving
Stream
Concentration
(C)-MZ
3.82
3.57
0.18
0.40
0.93
1.03
0.13
0.35
10.16
0.92
1.92
0.46
0.45
2.86
7.65
Receiving
Stream
Concentration
(C)-ZID
36.72
34.31
1.44
3.34
7.93
8.73
1.05
2.89
87.14
WQ Criteris:
Aquatic life chronic and acute standards were converted to total recoverable.
Hardness of 197 mg1L was used to calculate criteria for metals that are hardness dependent
7.86
16.44
3.89
3.77
24.50
65.57
RPTE
(Y/N)
Y
Qe= the current discharge. Hardness data obtained 2006-10 Discharge Monitoring Data, compares well wl USGS data.
CR IV maximum discharge concentration is an assumed value. approximately 113 of the total chromium.
Stream Flow and Mixrna Zone Determination:
Stream flow value was obtained from the USGS Gage Station 07010000 to calculatte !ow flow values as shown.
28
Outfall #001- Low Flows adiusted for results of mixln2 zone study.
All_metals are total recoverable. except fo :
Chromium VI
Qs = Stearn 7410 flow (Os), or 1010, or 30Q10 C =
Qe a Effluent design flow (ft!s)
Outfall 0001
Classified
Facility Name
Permit Number
Scream name
P streams only
MSD Lemay WWTF
MO-0025151
Mississippi R.
Qe■ 255.8
UNITS: Metals =
uglL; NO2, P,
Ammonia, O&G =
mgll.
Ammonia (May -Oct
Ammonia (Nov -Apr)
Oil & Grease(O&G)
Arsenic
'Cadmium
Chromium III
Chromium VI
(Copper
Cyanide
Lead
Nickel
NO2-NOS
Phosphorus (P)
.Silver
Zinc
Mercury
nc 1:
Upstream concentration is assumed.
Assumptions and Basis:
Qe= the current discharge.
CR VI maximum discharge concentration is an assumed value, approximately 113 of the total chromium.
Stream Flow and Mina Zone Determination:
Stream flow value was obtained from the USGS Gage Station 07010000 to calculate low flow values as shown.
Adjusted flows based upon results of 2005 CORMIX Modeling Study. Dilution ratio multiplied by 208 cfs effluent discharge:
1) 1010 - 37.1:1 2) 30010 - 39.2:1 3) 7010 -- 38.6:1.
Aquatic Life
Acute (Cc)
12.1
12.1
10.0
3142.0
15.3
26.5
22.0
193.6
834.0
12.1
213.0
2.4
Qs 1 Q10 = 754.3
Qs 30Q10 - 8075.2
Qs 7Q10. 7951.E
Aquatic Life
Chronic (Cc)
1.5
3.1
10.0
20.0
0.5
212.0
10.4
13.9
5.0
7.5
92.6
0.0
193.0
0.5
Chronic
Drinking
Water
Standard
50
5
100
1300
15
100
10
50
5000 _
2
Cs = combined stream concentrations (see Footnote 1 below)
Ce = madmum effluent concentration
NA • not applicable
Maximum
Concln Upstream RPTE
CV (Ce) WQ (Cs)' Calculation
0.89
1.19
0.47
0.71
1.60
0.91,
0.34
2.05
0.66
0.69
0.938
0.573
1.48
0.69
0.86
67.20
48.20
6.00
8.00
9.00
17.00
4.81
11.00
78.00
20.00
40.00
7.32
10.59
30.00
180.00
0.60
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
218.12 ,
201.93
9.09
21.13
50.25
55.36
6.59
18.26
552.88
49.82
104.25
24.82
23.88
155.42
416.01
1.87
(C.*Qs) +(Ce *Qe)
(Q. + Q°)
Receiving Receiving
Stream Stream
Concentration Concentration
(C)-MZ (C)-ZID
6.65
6.21
0.29
0.66
1.55
1.71
0.21
0.57
16.99
1.54
3.21
0.77
0.74
4.78
12.78
0.07
1NQ Criteria:
Aquatic life chronic and acute standards were converted to total recoverable.
Hardness of 197 mg/L was used to calculate criteria for metals that are hardness dependent.
Hardness data obtained from 2006-10 Discharge Monitoring Data, compares well wl USGS data
168.40
155.48
2.22
5.15
12.24
13.48
1.81
4.45
134.58
12.13
25.38
8.00
5.82
37.84
101.26
0.46
RPTE
(YIN)
Y
N/A -Not Applicable
1) Units are (ptg/L) unless otherwise noted in table above.
2) If the number of samples was greater than 10, then the CV value must be used in the WQBEL for the applicable constituent.
3) Coefficient of Variation (CV) is calculated by dividing the Standard Deviation of the sample set by the Mean of the sample set.
4) Receiving Stream Concentration -It is the concentration of a toxicant or the parameter toxicity in the receiving water after mixing.
5) n -- Is the number of samples. Number of samples was 18 except ammonia, 104 samples in summer and 96 samples in winter, and
oil and grease, 52 samples.
6) RPTE - Reasonable Potential To Exceed. It is where an effluent is projected or calculated to cause an excursion above a water
quality standard based on a number of factors including- as a minimum, the four factors listed in 40 CFR 122.44(dx1)(ii).
29
Outfall #002- Low Flows adjusted for results of mixin¢ zone study.
Outfall #002
Classified P streams only
Facility Name MSD Lemay WWTF
Permit Number MO-0025151
Stream name Mississippi R.
Qe= 2.8
Qs1Q10=764.3
Qs 30Q10 = 8075.2
Os 7C1111= 7S1r 1 1
All metals are total recoverable. except for:
Chromium VI
Qs = Stream 7Q10 flow (fele), or 1010, or 30010
Qe = Effluent design flow (flak)
Ca = combined stream concentrations (see Footnote 1 below)
Ce = maximum effluent concentration
_ . _._
UNITS: Metals = -Chronic .._.-_�
RrEieiving i%celving
uglt.; NO2, P, Drinking Maximum Stream Stream
Ammonia, O&G = Aquatic Life Aquatic Life Water Concentration Upstream WQ RPTE Concentration Concentration RPTE
mg/L Acute (Cc) Chronic (Cc) Standard CV (Ce) (Cs)1 Calculation (C)-MZ (C)-ZID (YIN)
Ammonia ,May -Oct)
12.1
1.5
0.90
60.50
0.01
175.37
0.07
6.21
N
m1Ncv-Apr)
12.1
3.1
0.61
53.80
0.01
116.66
0.05
4.13
N
Oil & Grease(O&G)
10.0
0.52
5.00
0.01
7.88
0.01
0.04
N
Arsenic
20.0
_ 50
0.45
21.0C
0.01
40.66
0.02
0.15
N
Caamium
10.0
0.5
5
1.90
9.00
0.01
59.27
0.03
3.22
N
Chromium III
3142.0
212.0
100
0.63
10.00
0.01
24.03
0.02
0.09
N
Chromium. VI
15.3
10.4
4 91
0.01
6.73
0.01
_
0.03
N -
Copper
26.5
13.9
1300
0.88
92.90
0.01
294, 39
0.11
1.04
N
Cyanide
22.0
5.0
1.09
20.00
0.01
_
77.33
C.C4
0.28
N
Lead
193.6
7.5
15
0.71
27.00
0.01
71.53
0.04
0.26
N
Nickel
834.0
92.6
100
0.90
40.00
0.01
_
130.05
G.06
0.47
N
NO2-NO3
10
1.21
6.44
0.01
27.43
0.02
0.11
N
Phosphorus(P)
C.56
11.0:
0.01
24.51
0.02
0.10
N
rSliver
12.1
C.0
50
1.48
30.00
0.01
155.42
0.06
0.56
N
inc
213.0
193.0
5003
0A7
94.00
0.01
186.41
0.08
0.66
!1
Mercury
2.4
3.5
2
0.85
_
0.80
0.01
1.88
0.01
0.02
N
Upstream concentration is assumed.
Assumnbons and Basis:
Qe= the current discharge.
CR VI maximum discharge concentration is an assumed value. approximately 1f3 of the total chromium.
Stream Flow and Mixing Zone Determination:
Stream flow value was obtained from the USGS Gage Station: 07010000 to calculate low flow values as shown.
Adjusted flows based upon results of 2005 CORMIX Modeling Study. Dilution ratio multiplied by 208 cfs effluent discharge:
1) 1 Q 10 - 37.1:1 2) 30Q10 -- 39.2.1 3) 7010 - 38,6:1.
N/A -Not Applicable
1) Units are (µg/L) unless otherwise noted in table above.
2) If the number of samples was greater than 10, then the CV value must be used in the WQBEL for the applicable constituent.
3) Coefficient of Variation (CV) is calculated by dividing the Standard Deviation of the sample set by the Mean of the sample set.
4) Receiving Stream Concentration -- It is the concentration of a toxicant or the parameter toxicity in the receiving water after mixing
5) n -- Is the number of samples. Number of samples was 18 except ammonia, 24 samples in summer and 28 samples in winter, and
oil and grease, 52 samples.
6) RPTE -- Reasonable Potential To Exceed. It is where an effluent is projected or calculated to cause an excursion above a water
quality standard based on a number of factors including, as a minimum, the four factors listed in 40 CFR 122.44(d)(1)(ii).
Aquatic life chronic and acute standards were carvertec to total recoverable.
Hardness of 197 irig, L was used to calculate criteria for metals that are hardness dependent.
Haraness data obtained from 2006-1 C Discharge Monitoring Data. compares well w/ USGS data
APPENDIX D - WATER QUALITY BASED EFFLUENT LIMIfTATIONS FOR CYANIDE AND METALS FROM OUTFALL #001
Duffel! #001 Allowable discharge le equal to Cem((Qe+Qs)Cc-(Os•CagiQ
Classified P streams only Cwe= da mstream concentration, the Water QualAy Stands'
Facility Name MSD Lemay WWTF Oa = Stream 7010 flow SA). co 1010, or 30010
Permit Number MO-0025151 Qe = proposed effluent design flow (ftrh)
Stream name Mississippi R. Qs 1010 ■ 764.3 Cs = stream wncentraam■ (see Footnote 1)
Qs 30Q10 ■ 8075.2 Ce ■ effluent concentration
Qom 256.8 Os 7Q70 ■ 7952 Qs de.rsa..d as6for mixing WAS and 0.026for acme of miss' elution eonelderaaons
C ronrc
Drinking Receiving
Water Stream
Aquatic Life Aquatic Life Standard or Concentration
UN
etalwuglL Acute (Cc) Chronic (Cc) WBC z (Cs)1 WLAa WLAc LTAa LTAc
43.78
8.5
admium
Cyanide
22.0
0 00 5.0
50 Q.01 .09
28.50' 0.001 4.4
31 _ 0.0
liver
FFo of �1i 1: Up stream water quality was assumed.
WaSagja:
Aquatic life chronic and acute standards were converted to total recoverable.
Assumptions and Basks; Hardness of 197 mglL was used to calculate criteria for metals that are hardness dependent.
Metals Multipliers:
0
STDEV 2.8 17.4 8.9 For LTA. MDL the 99th Percentile was used.
MEAN 1.7 8.5 6.0 For AML, the 95th Percentile was used.
CV 1.6 2.1 1.5
Acute LTA: 0.14 0.11 0.14
Chronic LTA. 0.25 0 20 0.26
MDL' 7.29 8.83 6.93
AML 2.48 2.85 2.40
Mixing Zone Determination:
Mixing Zone (MZ): One -quarter (1/4) of the stream volume of flow; length one -quarter (1/4) mile. [10 CSR 20-7.031(4)(A)4.B.(I1l)(a)1.
Zone
fats d upCORM ZI nh (0. Zof the ons mbdng
2 06. zone volume of flow, not to exceed 10 times the effluent design flow. [10 CSR 20-7.031(4XA)4.B.(III)(b)].
volumeFlow
Ezcolanation_Of Limits:
Because the Mississippi River has drinking water designated uses, the lesser of the chronic drinking water or aquatic life criteria may be used to determine VVLAc.
The lesser of the LTAa or LTAc was used to determine MDL and AML (shown in bold letters above on table).
The presence of zeros in the WLA and LTA columns indicates that no water quality criteria available.
Wier Ce using the ahroulc WOS
WLW Ce using the acute WQS
LTAa= WLA acute • LTAa multiplier
LTAc • WLA chronic • LTAc mulaplier
MDL ugf . a the more protective LTA (LTAa or LTAc) • AML multiplier
AMLug/L.= the more protective LTA (LTAa or LTAc) •MDL multipfer
MDL AML
7.8
39.1
21.6
2.7
12.8
7.4
31
,1
i