PRETREATMENT RATIONALE FOR ISSUANCE

Ambit Chemical Technologies
Harrison
Gulfport, MS
Water I Branch

MSP092477
SIC: 2899
April 2025
Permit Engineer: Samar Patel

I.	FACILITY INFORMATION

A.	Nature of Business: Toll chemical manufacturer. Most of the chemical products manufactured at Channel Chemical are used as oil field maintenance chemicals.

B.	Process Wastewater Description: Wastewater includes the cleaning of reactors at the end of production, the washdown of containment areas for spill cleanups, and the cleaning of hoses and other equipment used in production. The process water is collected in totes which are checked for pH and flash tested to determine presence of solvents.  
C.	Proposed Flowrate: 1,000 gallons per day
D.	Applicable Federal Guidelines: None. 

II.	RECEIVING POTW INFORMATION

A.	POTW Name, Agency Interest No., and Permit No.: Bernard Bayou Industrial District; AI# 1852; MS0027537
B.	POTW Treatment Type: Oxidation Ditch followed by disinfection
C.	POTW Design Flowrate: 0.6 MGD 
D.	POTW Receiving Stream: Drainage ditch thence into Bernard Bayou
E.	POTW Receiving Stream 7Q10 (Q7/10): 0.0 cfs

III.	APPLICATION DATA

Parameter	Maximum Daily Value	
BOD (mg/L)	20,000	
COD (mg/L)	75,000	
TSS (mg/L)	4,290	
Ammonia (as N) (mg/L)	214	
Flow (gpd)	1,000 (Proposed)	
pH (S.U.)	8.00 (max)	

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

•	The permittee must comply with the general pretreatment regulations established in 40 CFR 403.

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

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

•	Public notice will be required for this permit issuance.  

•	The values reported in the application based on one sample for BOD5, COD, TSS & NH3-N are at significantly high levels. As such, the permittee shall be required to monitor these parameters once per week for six months with grab samples of the effluent beginning the month following the effective issuance date of the permit. All monitoring results shall be submitted to the Mississippi Department of Environmental Quality no later than the 28th day of the month following the complete collection of all samples.  The permit may be revisited and/or modified to include limits for these parameters after evaluating the additional data, if justified.

•	Within one hundred and eighty (180) days of commencing of discharge to POTW, the permittee shall complete and submit effluent characteristics (i.e., 17A, 17B, and 17C) of pretreatment application Form 2P. The effluent data shall be evaluated at that time and the permit may be reopened and modified if such data indicates a violation of water quality standards.