PERMIT RATIONALE FOR REISSUANCE
Valero MKS Logistics LLC, Collierville Terminal
Water NPDES No. MS0047431
Thomas Kelly, Water I Branch
April 30, 2025

I.	FACILITY INFORMATION

Facility Address:  772 Wingo Road, Byhalia, MS  38611 
Facility County:  Marshall
EPA ID:  110002203400
SIC:  4612

II.	NATURE OF BUSINESS

Valero MKS Logistics LLC, Collierville Terminal transports and stores crude oil (SIC Code 4612). The facility consists of three (3) active storage tanks. Each tank is surrounded by an earthen dike large enough to contain the maximum capacity of the largest storage tank within the secondary containment boundaries. The facility is classified as an NPDES Minor Source. 

III.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Outfall 001:	Effluent consists of storm water runoff discharged from south containment basin with an area of 277,843 square feet.

Outfall 002:	Effluent consists of storm water from middle containment basin with an area of 228,540 square feet.

Outfall 003:	Effluent consists of storm water from north containment basin with an area of 205,870 square feet.

Outfall 001 is located on the south side of the facility, and Outfall(s) 002 and 003 are located on the north side of the facility. All outfalls discharge to an unnamed tributary (7Q10=0 cfs) of Nonconnah Creek located in the North Independent Streams Basin. This stream is classified as “fish and Wildlife”.

IV.	303(d) and TMDL ISSUES

There are no 303(d) issues with Nonconnah Creek. This permit complies with the following applicable TMDLs:

V.	TYPE OF WASTEWATER TREATMENT:

None.

VII.	DATA FROM APPLICATION FORM (2F):

VIII. 	WATER QUALITY LIMITATIONS BASED ON WASTELOAD ALLOCATION 

	Not Applicable.

IX.	CATEGORICAL GUIDELINE LIMITATIONS CALCULATIONS

Not Applicable.

X.	TOXICITY SCREENING

Not Applicable.
XI.	PROPOSED FINAL LIMITATIONS 

1.	Average Permit Limitations

Outfall	Parameter	Categorical Limitation	Water Quality Limitation	Present Permit Limitation	Proposed Permit Limitation	Monitoring Frequency	Sample Type	DMR Reporting Frequency	1Basis	
001	Flow (MGD)	--	--	Report 	Report	Quarterly	Instantaneous Sampling	Annually	PPL, TJ	
001	Oil and Grease	--	--	10 mg/L	10 mg/L	Quarterly	Grab Sampling	Annually	PPL, TJ	
001	pH	--	6.0 SU	6.0 SU	6.0 SU	Quarterly	Grab Sampling	Annually	PPL, MSWQS	
002	Flow (MGD)	--	--	Report 	Report	Quarterly	Instantaneous Sampling	Annually	PPL, TJ	
002	Oil and Grease	--	--	10 mg/L	10 mg/L	Quarterly	Grab Sampling	Annually	PPL, TJ	
002	pH	--	6.0 SU	6.0 SU	6.0 SU	Quarterly	Grab Sampling	Annually	PPL, MSWQS	
003	Flow (MGD)	--	--	Report 	Report	Quarterly	Instantaneous Sampling	Annually	PPL, TJ	
003	Oil and Grease	--	--	10 mg/L	10 mg/L	Quarterly	Grab Sampling	Annually	PPL, TJ	
003	pH	--	6.0 SU	6.0 SU	6.0 SU	Quarterly	Grab Sampling	Annually	PPL, MSWQS	

2.	Maximum Permit Limitations

Outfall	Parameter	Categorical Limitation	Water Quality Limitation	Present Permit Limitation	Proposed Permit Limitation	Monitoring Frequency	Sample Type	DMR Reporting Frequency	1Basis	
001	Flow (MGD)	--	--	Report 	Report	Quarterly	Instantaneous Sampling	Annually	PPL, TJ	
001	Oil and Grease	--	--	15 mg/L	15 mg/L	Quarterly	Grab Sampling	Annually	PPL, TJ	
001	pH	--	9.0 SU	9.0 SU	9.0 SU	Quarterly	Grab Sampling	Annually	PPL, MSWQS	
002	Flow (MGD)	--	--	Report 	Report	Quarterly	Instantaneous Sampling	Annually	PPL, TJ	
002	Oil and Grease	--	--	15 mg/L	15 mg/L	Quarterly	Grab Sampling	Annually	PPL, TJ	
002	pH	--	9.0 SU	9.0 SU	9.0 SU	Quarterly	Grab Sampling	Annually	PPL, MSWQS	
003	Flow (MGD)	--	--	Report 	Report	Quarterly	Instantaneous Sampling	Annually	PPL, TJ	
003	Oil and Grease	--	--	15 mg/L	15 mg/L	Quarterly	Grab Sampling	Annually	PPL, TJ	
003	pH	--	9.0 SU	9.0 SU	9.0 SU	Quarterly	Grab Sampling	Annually	PPL, MSWQS	
1Basis: MSWQS = Mississippi Water Quality Standards, PPL=Previous Permit Limits, TJ=Technical Judgment

XII.	STATEMENT OF BASIS:

It is our judgment that the foregoing limitations represent Technical Judgment (TJ), and 11 Miss. Admin. Code Pt.6, Ch. 1 and 2 (MSWQS).