PERMIT RATIONALE FOR REISSUANCE
Ambit Chemical Technologies
Harrison County
Gulfport, Mississippi
Water NPDES No. MS0034878
February 2026

I.	FACILITY INFORMATION

Facility Name:  Ambit Chemical Technologies
Facility Address:  14373 Seaway Road 
Gulfport, MS  39503    
Gulfport, 
Permit No.:  MS0034878
SIC:  2899 Chemicals and Chemical Preparations, Not Elsewhere Classified
         2819 Industrial Inorganic Chemicals, Not Elsewhere Classified
Permit Writer:  Samar Patel
EPD Branch:  Water I Branch

II.	NATURE OF BUSINESS

Ambit Chemical Technologies (Ambit Chemical) is a toll chemical manufacturer. Most of the chemical products manufactured at Ambit Chemical are used as oil field maintenance chemicals.

III.	EFFLUENT AND RECEIVING STREAM FLOW DATA

A.	Outfall 001: 	Maximum Daily Flow = 0.0112 MGD
			
Wastewater Description	Average Flow (gpd)	
Steam Condensate	206	
Process Area Storm Water	514	

B.	Outfall 002: 	Maximum Daily Flow = 0.00 MGD* (No discharge event: Feb 2023 
                                                                                  thru April 2025)
			
C.	Outfall 003: 	Maximum Daily Flow = 0.0199 MGD
			
Wastewater Description	Average Flow (gpd)	
Process Area Storm Water	4856	

The rain water collected in the diked areas and that falls on the east side of the production area is either manually pumped or sheet flows east to a north-flowing drainage line ultimately to a small basin, prior to being discharged from Outfall 001.  The only storm water leaving at the Outfall 002 discharge point is overflow discharge from the Cooling Pond during large rainfall events. The Cooling Pond recirculates non-contact cooling water used to cool the reactors. The Cooling Pond is slightly elevated such that storm water cannot drain into it from surrounding areas. Only storm water that would fall directly on the pond would be discharged via Outfall 002. There is only an overflow discharge from Outfall 002 when there is a significant rainfall event. There is no discharge from Outfall 002 during the reported 2-year period (February 2023 – April 2025). Rainwater that falls on most of the manufacturing areas, including the northern employee parking lot and north tank farm and production areas, and rain that falls east of the facility sheet flows north to one of five (5) catch basins located along the northern end of the manufacturing area. All five (5) catch basins are connected by an underground drain line that routes water to Outfall 003.   The receiving body for Outfalls 001, 002 and 003 is an unnamed tributary thence Bernard Bayou.  The unnamed tributary 7Q10 flow is 0 MGD.  The unnamed tributary and Bernard Bayou are in the Coastal Stream Basin. 

IV.	303(d) ISSUES

Bernard Bayou is not listed as an impaired body on the Mississippi 1018 Section 303(d) List of Impaired Water Body.  Bernard Bayou and Industrial Seaway have TMDLs for Organic Enrichment/Low Dissolved Oxygen and Nutrients, Phenol and Total Toxics. These TMDLs did not assign any specific limits to Channel’s discharge since they were not evaluated in the final TMDLs for Bernard Bayou. Based on their discharge type, they will not adversely affect Biological Impairment in Bernard Bayou. 

V.	TYPE OF WASTEWATER TREATMENT:

The storm water discharged into Outfall 001 is treated for pH using lime or aqua ammonia, if necessary, prior to being released from the newly constructed retention pond. This pond retains water that allows the settling of suspended solids. In addition, the discharge sump at Outfall 001 is equipped with a sediment filtration bag to collect any additional solids that could not settle in the pond. 

The overflow pipe from the non-contact cooling pond and the discharge sump at Outfall 002 are equipped with a sediment filtration bag to remove solids. 

No treatment is provided to the storm water discharge through Outfall 003. 

VI.	EPA APPLICABLE CATEGORICAL GUIDELINES

No process wastewater is discharged so there are no applicable categorical effluent limitations.

VII.	STATE APPLICABLE GUIDELINES

Wastewater Regulations for National Pollutant Discharge Elimination System (NPDES) Permits, Underground Injection Control (UIC) Permits, State Permits, Water Quality Based Effluent Limitations and Water Quality Certification (11 Miss. Admin. Code Pt. 6, Ch. 1.)

State of Mississippi Water Quality Criteria for Intrastate, Interstate, and Coastal Waters (11 Miss. Admin. Code Pt. 6, Ch. 2.)

VIII.	DATA FROM APPLICATION 
	
	Outfall 001 (FORM 2C) 

Pollutant	Maximum Daily Value 	No. of Analyses	
BOD	51.0 mg/L	16	
TSS	58.0 mg/L	16	
Ammonia (as N)	0.16 mg/L	16	
Temperature	27.0 oC / 80.6oF	16	
pH	6.69-8.60 s.u.	16	
Oil and Grease	5.10	16	

	Outfall 002 (FORM 2E) – NO DICHARGE EVENT IN RECENT YEARS; HISTORICAL ANALYTICAL RESULTS PRESENTED.

Pollutant	Maximum Daily Value	No. of Analyses	
BOD	10.0 mg/L	1	
COD	38 mg/L	1	
TOC	14.2 mg/L	1	
TSS	45 mg/L	10	
Oil and Grease	ND	1	
Ammonia (as N)	ND	1	
Temperature	31/80.6oF	10	
pH	7.80 s.u.	10	

Outfall 003 (FORM 2F)

Pollutant	Maximum Daily Value	No. of Analyses	
BOD	41.0 mg/L	21	
TSS	61.2 mg/L	21	
pH	6.77-8.12 s.u.	21	
Oil and Grease	10.8 mg/L	21	

IX. 	WATER QUALITY LIMITATIONS BASED ON WASTELOAD ALLOCATION 
	
	Not Applicable.

X.        CATEGORICAL GUIDELINE LIMITATIONS CALCULATIONS

Not applicable.

XI.       TOXICITY SCREENING

Not applicable.

XII.	PROPOSED FINAL LIMITATIONS 

	Outfall 001

Parameter	Water Quality Limitation	Present Permit Limit	Proposed Permit Limit	Basis*	Sampling Frequency	Sample Type	
	Avg.	Max.	Avg.	Max.	Avg.	Max.				
Flow	---	---	Report MGD	Report MGD	Report MGD	Report MGD	§122.44(d)	Once/Month	Instantaneous	
Temperature	---	90oF	Report	90oF	Report	90oF	WQC	Once/Month	Instantaneous	
pH (SU)	 6.0
(min)	 9.0 (max)	 6.0
(min)	 9.0 (max)	 6.0
(min)	 9.0 
(max)	WQC	Once/Mont	Grab	
BOD	---	---	Report mg/l	Report mg/l	Report mg/l	Report mg/l	§122.44(d)	Once/month	Grab	
TSS	---	---	100
mg/L	R mg/L	100 mg/L	R mg/L	§122.44(d)	Once/Month	Grab	
Oil and Grease	---	---	10 mg/L	15 mg/L	10 mg/L	15 mg/L	§122.44(d)	Once/Month	Grab	
Ammonia (as N)	---	---	Report mg/l	Report mg/l	Report mg/l	Report mg/l	§122.44(d)	Once/Month	Grab	
* WQC = Water Quality Criteria

Flow and temperature shall be monitored instantaneously, and all other parameters shall be monitored through grab sample. Temperature is measured to ensure that the steam condensate does not cause this outfall to exceed the state standard of 90oF.  Since this is storm water from the process areas, BOD, TSS, Oil and Grease and Ammonia (as N) shall be monitored.  

	Outfall 002

Parameter	Water Quality Limitation	Present Permit 
Limit	Proposed Permit 
Limit	Basis*	Sampling 
Frequency	Sample Type	
	Avg.	Max.	Avg.	Max.	Avg.	Max.				
TSS	---	---	100 mg/L	R mg/L	100 mg/L	R mg/L	§122.44(d)	Once/Mont	Grab	
pH (SU)	6.0
(min)	 9.0
(max)	 6.0
(min)	 9.0 
(max)	 6.0
(min)	 9.0 
(max)	WQC	Once/Month	Grab	
Oil and Grease	---	---	---	---	10 mg/L	15 mg/L	§122.44(d)	Once/Mont	Grab	
Flow	---	---	Report
MGD	Report
MGD	Report MGD	Report
MGD	§122.44(d)	Once/Mont	Instantaneous	
Temperature	---	90oF	Report	90oF	Report	90oF	WQC	Once/Month	Instantaneous	
* WQC = Water Quality Criteria
 
Flow and temperature shall be monitored instantaneously, and all other parameters shall be monitored through grab sample.  Temperature is measured to ensure that the cooling pond water does not exceed the state standard of 90oF.  Since this storm water encounters the process areas, maintenance areas, and open chemical drum storage areas, TSS and Oil and Grease will be monitored.  

Outfall 003	

Parameter	Water Quality Limitation	Present Permit Limit	Proposed Permit Limit	Basis*	Sampling Frequency	Sample Type	
	Avg.	Max.	Avg.	Max.	Avg.	Max.				
TSS	---	---	---	---	Report mg/L	Report mg/L	§122.44(d)	Ocne/Month	Grab	
BOD	---	---	---	---	Report mg/L	Report mg/L	§122.44(d)	Once/Month	Grab	
pH (SU)	6.0
(min)	 9.0
(max)	 6.0
(min)	 9.0 
(max)	 6.0
(min)	 9.0 
(max)	WQC	Once/Month	Grab	
Oil and Grease	---	---	---	---	Report
mg/L	Report
mg/L	§122.44(d)	Once/Month	Grab	
Flow	---	---	Report	Report	Report MGD	Report MGD	§122.44(d)	Once/Month	Instantaneous	

Flow shall be monitored instantaneously, and all other parameters shall be monitored through grab sample.  The monitoring for TSS, BOD, and oil and grease will be required since the storm water potentially comes in contact with the process areas including their northern tank farm areas, production areas and northern employee parking lot to ensure that proper BMPs will be practiced so that the amount of oil and grease or other materials exposed to storm water will be minimized.