PERMIT RATIONALE FOR REISSUANCE
Bayer Research and Development Services LLC
Bolivar County
Scott,, Mississippi
Water NPDES No. MS0058769
July 2023

I.	CLASSIFICATION-Minor Industrial

II.	NATURE OF BUSINESS & TREATMENT
 
SIC 4952 – Sewerage Systems – The applicant proposes to collect and treat domestic sewage originating from several residences and office buildings.

SIC 0724 & 0723 - The facility operates as a cotton gin and a cottonseed delinting plant for area cotton farmers.

III.	RECEIVING STREAM-

Deer Creek does not appear on a TMDL nor the current 303 List of Impaired Waterbodies.

Outfall 001
Receiving Stream – Unnamed Tributary of Deer Creek.  7Q10 is 0.0 cfs. Receiving stream is within the Yazoo River basin, and is classified as Fish and Wildlife. The effluent will consist of 12,000 gallons per day (average daily value) of treated domestic wastewater.

Outfall 002
Receiving Stream – Unnamed Tributary of Deer Creek. 7Q10 is 0.0 cfs. Receiving stream is within the Yazoo River basin, and is classified as Fish and Wildlife. The effluent will consist of non-contact cooling water.

IV.	303(d) ISSUES

The receiving stream Deer Creek has completed TMDLs for organic enrichment / low do, pathogens, and sediment / siltation. The facility is not listed as a point source in any of the TMDLs. The permit is a reissuance with no load increase. The organic enrichment / low do TMDL does not call for load reduction; therefore, the facility will comply with the conditions of the TMDL. The facility disinfects which complies with pathogen TMDL. The facility will not contribute to the sedimentation impairment of Deer Creek. Deer Creek does not appear on the current 303(d) list of impaired waterbodies.

V.	TYPE OF WASTEWATER TREATMENT:

Outfall 001 12,000 gpd activated sludge Plant, with UV disinfection and chlorination.  The facility is required to operate at least one method of disinfection prior to discharge.

Outfall 002 Carbon Drum

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Outfall 001

Parameter		Value					Basis
Flow			0.012 MGD				Design
BOD			30 mg/l 				Previous Permit
TSS			30 mg/l 				Previous Permit
E. Coli			126 Col./100mL 			TMDL
Effluent pH		6.0 to 9.0 S.U.				Previous Permit
Chlorine		0.011 mg/l				Previous Permit
	
The minimum and maximum values for Influent ph, Dissolved Oxygen in aeration unit, and 30-Minute Sludge Settleability in aeration unit must be reported.  All previously permitted parameters have remained the same in the reissuance, except chlorine disinfection which was added in this permit

*This limit only applies when chlorine disinfection is being used.  The permittee is not required to test for this parameter when chlorine is not being applied to the wastewater for disinfection.

Outfall 002

Parameter		Value					Basis
Flow			Report					Previous Permit
BOD			10 mg/l 				Previous Permit
NH3-N			2 mg/l 					Previous Permit
Temperature		90°F 					Previous Permit
Dissoloved Oxygen	6.0 mg/l minimum			Previous Permit
Effluent pH		6.0 to 9.0 S.U.				MS WQS

VII.	CHANGES FROM PREVIOUS PERMIT- 

No change from last reissuance