PRETREATMENT RATIONALE FOR ISSUANCE

AFCO Plastic Products
Desoto
Olive Branch, MS
Water I Branch

MSP092475
SIC: 3444
March 2025
Permit Engineer: Samar Patel

I.	FACILITY INFORMATION

A.	Nature of Business: Manufacturer of thresholds, astragals, and weather-stripping components for doorsills. 
B.	Process Wastewater Description: Process wastewater consists of water used in contact cooling for the plastic extrusion operations of production lines.
C.	Proposed Flowrate (Batch Discharge): 645 gallons (once a week, typically on Thursday)
D.	Applicable Federal Guidelines: 40 CFR 463 Plastics Molding and Forming Point Source Category, Subpart A – Contact Cooling and Heating Water Subcategory. 

II.	RECEIVING POTW INFORMATION

A.	POTW and Permit Number:  City of Olive Branch, Metro POTW (MS0028479 and AI-3129)
B.	POTW Treatment Type: Activated Sludge	
C.	POTW Design Flowrate: 	Phase I: 	0.537 MGD
Phase II:	1.0 MGD
Phase III:	1.5 MGD     
D.	POTW Receiving Stream: Unnamed tributary thence of Nonconnah Creek
E.	POTW Receiving Stream, 7Q10 (Q7/10) at the point of discharge: 0.0 cfs 

III.	APPLICATION DATA

BOD (mg/L)	<5.00	
COD (mg/L)	< 15.00	
TSS (mg/L)	<2.00	
Ammonia (as N) (mg/L)	<0.100	
Flow (Batch Discharge)	645 gallons per day (Proposed)	
Temperature	16.4°C (61.52°F)	
pH (S.U.)	7.10 (max)	
Chlorine (mg/L)	<0.07	
Fluoride (mg/L)	0.781	
Nitrate-Nitrite (mg/L)	0.677	
Nitrogen, Total Organic (as N) (mg/L)	<5.0	
Oil and Grease (mg/L)	<1.4	
Phosphorus, Total (as P) (mg/L)	<0.50	
Sulfate (as SO4) (mg/L)	3.91	
Sulfide (mg/L)	<0.5	
Sulfite (as SO3) (mg/L)	<2.00	
Total Barium (mg/L)	0.0267	
Iron, Total (mg/L)	<0.100	
Copper, Total (mg/L)	0.0220	
Lead, Total (mg/L)	<0.0060	
Nickel, Total (mg/L)	<0.0050	
Zinc, Total (mg/L)	0.0347	
Phenols, Total (mg/L)	0.0304	

IV.	PROPOSED PERMIT LIMITS
Parameter	Current Permit 
Limits (CPL)	Proposed Permit 
Limits (PPL)	Basis1	
	Avg. (mg/L)	Max. (mg/L)	Avg. (mg/L)	Max. (mg/L)		
Flow	--	--	Report MGD	Report MGD	EJ	
pH	--	--	6.0 (min.) SU	9.0 (max.) SU	WQC	

1	Basis of Decision: EJ – Engineering Judgment; WQC = Water Quality Criteria

•	Since the facility is subject to 40 CFR Part 463, Subpart A, they must comply with the general pretreatment regulations established in 40 CFR 403.

•	The Flow shall be monitored once per week utilizing a flow meter. pH shall be monitored once per week via a grab sample.

•	Due to a very small discharge from AFCO, MDEQ does not believe they need to be evaluated for metals contribution.  

•	Public notice will be required for this permit issuance.  

V.