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. MO-0097926

Owner: Engineered Support Systems, Inc.

Address: 201 Evans Lane, St. Louis, MO 63121

Continuing Authority: Same as above

Address: Same as above

Facility Name: Engineered Coil Company, dba Marlo Coil

Address: 6060 Highway PP, High Ridge, MO 63049

Legal Description: SE 1⁄4, NE 1⁄4, NE 1⁄4, Sec. 22, T43N, R4E, Jefferson County

Receiving Stream: Tributary to Antire Creek (U)

First Classified Stream and ID: Antire Creek (P) (02188)

USGS Basin & Sub-watershed No.: (07140102-080001)

is authorized to discharge from the facility described herein, in accordance with the effluent limitations and monitoring requirements

as set forth herein:

FACILITY DESCRIPTION

See 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.

July 11, 2003 Effective Date Stephen M. Mahfood, Director, Department of Natural Resources

Executive Secretary, Clean Water Commission

July 10, 2008 Expiration Date Jim Hull, Director of Staff, Clean Water Commission

MO 780-0041 (10-93)
Page 2 of 6

Permit No. MO-0097926

FACILITY DESCRIPTION (continued)

Outfall #001 - Domestic - SIC #4952

Extended aeration/year around chlorination/aerated sludge holding tank/sludge disposal is

by contract hauler.

Design population equivalent is 59.

Design flow is 3,000 gallons per day.

Actual flow is 2,430 gallons per day.

Design sludge production is 1.06 dry tons/year.

Actual sludge production is 0.81 dry tons/year.

Outfall #002 – Industrial – SIC #3585

Industry Process Water

Back flush of rinse tank filter on East Plant paint line.

Design flow is 600 gallons per day.

Actual flow is 50 gallons per day.

Outfall #003 – Industrial – SIC #3585

Industry Process Water/Stormwater

Boiler blowdown, Softener backwash, East building roof drain.

Design flow, including stormwater, is 5,600 gallons per day, actual flow dependent upon

precipitation. Actual flow of process water is 18 gallons per day.

Outfall #004 – Industrial – SIC #3585

Industry Process Water/Stormwater

Vehicle and equipment washing, flushing coils, coil test tank backwash, intermittent roof

runoff.

Design flow, including stormwater, is 9,500 gallons per day.

Actual flow of process water is 288 gallons per day.

Outfall #005 – Industrial – SIC #3585

Industry Process Water

Back flush of Navy Products line rinse tank filter.

Design flow is 300 gallons per day.

Actual flow is 25 gallons per day.

Outfall #007 – Industrial – SIC #3585

Industry Stormwater runoff, East Building roof.

Design flow is 325,413 gallons per day

Flow dependent upon precipitation.

Outfall #008 – Industrial – SIC #3585

Industry Stormwater runoff, West Building roof.

Design flow is 298,080 gallons per day.

Flow dependent upon precipitation.
PAGE NUMBER 3 of 6

A. FINAL EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PERMIT NUMBER MO-0097926

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 April 30, 2006. Such discharges shall be controlled,

limited and monitored by the permittee as specified below:

INTERIM EFFLUENT LIMITATIONS MONITORING REQUIREMENTS

OUTFALL NUMBER AND EFFLUENT

PARAMETER(S) UNITS

DAILY

MAXIMUM

WEEKLY

AVERAGE

MONTHLY

AVERAGE

MEASUREMENT SAMPLE

FREQUENCY TYPE

Outfall #001

Flow

Biochemical Oxygen Demand5

Total Suspended Solids

pH – Units

Fecal Coliform

Total Residual Chlorine

(Note 1)

Outfalls #002 - #005

Flow

Oil & Grease

Chemical Oxygen Demand

Ammonia as N

Phosphorous as P, Total

pH – Units

Settleable Solids

Chromium, Total Recoverable

Copper, Total Recoverable

Barium, Total Recoverable

Iron, Total Recoverable

Aluminum, Total Recoverable

Zinc, Total Recoverable

Boron, Total Recoverable

Temperature

Outfalls #007 & #008

Flow

Oil & Grease

Chemical Oxygen Demand

pH – Units

Settleable Solids

MGD

mg/L

mg/L

SU

#/100mL

mg/L

MGD

mg/L

mg/L

mg/L

mg/L

SU

ml/L/hr

mg/L

mg/L

mg/L

mg/L

mg/L

mg/L

mg/L

°F

MGD

mg/L

mg/L

SU

ml/L/hr

*

***

1000

1.0

*

15

*

*

*

***

1.0

*

*

*

*

*

*

*

95

*

15

120

***

1.0

15

20

*

10

15

***

400

1.0

*

10

*

*

*

***

0.5

*

*

*

*

*

*

*

*

*

10

60

***

0.5

once/month 24 hr.

 estimate

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

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 October 28, 2003. 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 & III

STANDARD CONDITIONS DATED October 1, 1980 and August 15, 1994, AND HEREBY INCORPORATED AS

THOUGH FULLY SET FORTH HEREIN.
PAGE NUMBER 4 of 6

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PERMIT NUMBER MO-0097926

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 May 1, 2006 and remain in effect until expiration of the permit. Such discharges shall be

controlled, limited and monitored by the permittee as specified below:

FINAL EFFLUENT LIMITATIONS MONITORING REQUIREMENTS

OUTFALL NUMBER AND EFFLUENT

PARAMETER(S) UNITS

DAILY

MAXIMUM

WEEKLY

AVERAGE

MONTHLY

AVERAGE

MEASUREMENT SAMPLE

FREQUENCY TYPE

Instream Monitoring shall be conducted at the following locations:

Upstream – Just upstream of plant outfalls where stream is not influenced by the outfalls.

Downstream – DS #1 at approximately 50 yards downstream of outfall #008, and DS #2 at

beginning of classified portion of Antire Creek in Antire Valley County Park.

Chromium, Total Recoverable

Copper, Total Recoverable

Barium, Total Recoverable

Iron, Total Recoverable

Aluminum, Total Recoverable

Zinc, Total Recoverable

Boron, Total Recoverable

Temperature

pH-Units

mg/L

mg/L

 mg/L

mg/L

mg/L

mg/L

mg/L

°C

SU

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

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 October 28, 2003. 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 & III

STANDARD CONDITIONS DATED October 1, 1980 and August 15, 1994, AND HEREBY INCORPORATED AS

THOUGH FULLY SET FORTH HEREIN.

 MO 780-0010 (8/91)

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (continued)

 * Monitoring requirement only.

 ** Sample once per quarter in the months of February, May, August and November.

*** pH is measured in pH units and is not to be averaged. The pH shall not be less than

6.0, or greater than 9.0, unless the pH of the incoming water supply exceeds 9.0.

Note 1 - This permit contains a Total Residual Chlorine (TRC) limit.

a. The TRC limit in this permit is 1.0 mg/L; an analytical method with a quantification

limit between 0.2 and 0.5 mg/L shall be used. All analytical values below the

quantification limit shall be reported as “<quantlim.” All analytical values at or

above the quantification limit shall be reported as the measured value.

The average monthly effluent values for TRC will be determined by assuming that

analytical results below the quantification limit are equivalent to 0 mg/L when

calculating the monthly average.The daily effluent value will be considered equal to 0

mg/L if it is below the quantification limit.

b. Disinfection is required year-round.

 Page 5 of 6
 Permit No. MO-0097926

C. 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. Permittee will cease discharge by connection to areawide wastewater treatment system

within 90 days of notice of its availability.

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 μg/L);

(2) Two hundred micrograms per liter (200 μg/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.

5. Report as no-discharge when a discharge does not occur during the report period.

6. Sludge and Biosolids Use For Domestic Wastewater Treatment Facilities

(a) Permittee shall comply with the pollutant limitations, monitoring, reporting,

and other requirements in accordance with the attached permit Standard

Conditions.

(b) If sludge is not removed by a contract hauler, permittee is authorized to land

apply biosolids. Permit Standard Conditions, Part III shall apply to the land

application of biosolids. Permittee shall notify the department at least 180

days prior to the planned removal of biosolids. The department may require

submittal of a biosolids management plan for department review and approval as

determined appropriate on a case-by-case basis.

Page 6 of 6
 Permit No. MO-0097926

C. SPECIAL CONDITIONS (continued)

7. General Criteria. The following 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:

(a) 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;

(b) Waters shall be free from oil, scum and floating debris in sufficient amounts to

be unsightly or prevent full maintenance of beneficial uses;

(c) Waters shall be free from substances in sufficient amounts to cause unsightly

color or turbidity, offensive odor or prevent full maintenance of beneficial

uses;

(d) Waters shall be free from substances or conditions in sufficient amounts to

result in toxicity to human, animal or aquatic life;

(e) There shall be no significant human health hazard from incidental contact with

the water;

(f) There shall be no acute toxicity to livestock or wildlife watering;

(g) Waters shall be free from physical, chemical or hydrologic changes that would

impair the natural biological community;

(h) 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.