## 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, 92 nd 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 requi rements as set forth herein: 

### FACILITY DESCRIPTION

See page 2

This permit authorizes only wastewater discharges under the Missouri Clean Wate r 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, Direct or, 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 seri al number(s) as specified in the application for this permit. The interim effluent limitations shall become effective upon issuance and rema in in effect until April 30, 2006. Such discharges shall be c ontrolled, 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 Demand 5 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 CONDIT IONS 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 seri al 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 sh all be controlled, limited and monitored by the permittee as specified below: FINAL EFFLUENT LIMITATION S 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 CONDIT IONS 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 6Permit 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 6Permit 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.