PERMIT RATIONALE FOR REISSUANCE
G2O Technologies LLC
Wilkinson County
Centreville, Mississippi
Water NPDES No. MS0048097
May 2025

I.	FACILITY INFORMATION

Facility Name:  G2O Technologies LLC
Facility Address:  700 Highway 33 South 
Centreville, MS  39631    
Centreville, 
Permit No.:  MS0048097
SIC:  2821
Permit Writer:  Samar Patel
EPD Branch:  Chemical Branch

II.	NATURE OF BUSINESS

The facility manufactures a variety of polymers (primarily polyacrylate and melamine) used in the water treatment industry.  

III.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Outfall 001: This outfall receives non-contact cooling water only. The non-contact cooling water is routed to a cooling pond and then pumped out once the temperature is at or below 90oF.  Therefore, the water is discharged in batches and not continuously.  The cooling water is discharged to an unnamed tributary of Stafford Creek.  The 7Q10 of the tributary is zero.

IV.	303(d) ISSUES

Stafford Creek is in the South Independent Streams Basin and is classified for Fish and Wildlife use.  It is not addressed specifically in any TMDL; however, it is still listed on the 2024 Section 303(d) list of impaired water bodies for biological impairment.  Since the discharge from G2O Technologies LLC is not a high oxygen demanding wastewater, it should not further impair the creek.  

V.	TYPE OF WASTEWATER TREATMENT:

The non-contact cooling water, is routed to a concrete cooling pond, which allows the temperature to decrease by circulating the water through sprayers. 

VI.	EPA APPLICABLE CATEGORICAL GUIDELINES

Not applicable because there is no process wastewater discharged at this site.

VII.	DATA FROM APPLICATION FORM 2E

Parameter	Maximum Daily Value	No. of Samples	
BOD5 (mg/L)	<2.4	9	
TSS (mg/l)	<2.0	1	
COD (mg/l)	<15.0	1	
TOC (mg/l)	9.5	1	
Ammonia (as N, mg/l)	0.76	8	
Flow (MGD)	0.05	24	
pH (SU)	6.54 - 9.88	24	
Temperature (oF)	88.7	24	

	

VIII. 	WATER QUALITY LIMITATIONS BASED ON WASTELOAD ALLOCATION 

Wasteload allocation is not needed since no process wastewater or other oxygen demanding wastewater is discharged.

CATEGORICAL GUIDELINE LIMITATIONS CALCULATIONS

Not Applicable.

VII.	TOXICITY SCREENING

Not Applicable.

XI.	PROPOSED FINAL LIMITATIONS 

Outfall 001:
Parameter	Water Quality Limits	Current Permit Limits	Proposed Permit Limits	Monitoring Frequency 	Sample Type	Basis1	
	Avg.	Max.	Avg.	Max.	Avg.	Max.				
Flow (MGD)	--	--	Report	Report	Report	Report	Daily when Discharging	Estimate	EJ	
BOD5 (mg/l)	--	--	10	15	10	15	Quarterly	Grab	PPR, ABS	
pH (SU)	6.0 (min)	9.0 (max)	6.0 (min)	9.0 (max)	6.0 (min)	9.0 (max)	Once/discharge	Instantaneous	WQS	
DO (mg/l)	--	--	6.0 (min)	--	6.0 (min)	--	Quarterly	Grab	PPR,
ABS	
NH3-N (mg/l)	--	--	2	4	2.0	4.0	Quarterly	Grab	PPR, ABS	
Temperature (oF)	--	90oF	Report	90oF	 	90oF	Once/discharge	Instantaneous	WQS	
1 EJ – Engineering Judgment; ABS – Anti-Backsliding Provisions; WQS – MS Water Quality  Standards; PPR –                  Previous Permit Requirements. 

The water quality standards (WQS) found in 11 Miss. Admin. Code Pt. 6, R. 2.2.D. and R. 2.2.E. specify minimum conditions applicable to all waters for both pH and temperature, respectively.  Because the non-contact cooling water is used to dissipate heat from the manufacturing processes, it could exceed 90oF; therefore, temperature monitoring will be continued. pH monitoring shall continue to be required.  G2O has the capability to monitor temperature and pH continuously.  Therefore, the permit will specify that temperature and pH be recorded at least once per discharge event.  The daily flow shall also be measured for each discharge event.  The results shall continue to be submitted on a quarterly DMR.

The BOD5, Ammonia (as nitrogen), and Dissolved Oxygen (DO) limits 0f 10-2-6 are carried forward in the proposed permit based on Mississippi water quality standards. Since these limits are still considered protective of the receiving water body and the permittee has been demonstrating the ability to meet the limits, the proposed permit will continue to limit three parameters in accordance with the anti-backsliding (ABS) provisions.  

Storm water runoff from the site is permitted through a Baseline General Permit.  Sanitary wastewater is treated on-site via a no-discharge system.