PERMIT RATIONALE FOR ISSUANCE
University of Mississippi Medical Center
Hinds County
Jackson, Mississippi
Water NPDES No. MS0061247
October 1, 2019

I.	FACILITY INFORMATION

Facility Name:  University of Mississippi Medical Center
Facility Address:  2500 North State Street, Jackson, Mississippi 39216Jackson, 
Permit No.:  MS0061247 (NPDES Minor Industrial)
SIC:  8062 (General Medical and Surgical Hospitals)
Permit Writer:  Sherryl Couch
EPD Branch:  Water II

II.	NATURE OF BUSINESS

The University of Mississippi Medical Center in Jackson is the health sciences campus of the University of Mississippi, housing Schools of Medicine, Nursing, Health Related Professions, Dentistry and Graduate Studies in the Health Sciences, the University Hospitals and Clinics, and the Rowland Medical Library.  

III.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Effluent from Outfall 001 consists of non-contact cooling tower(s) discharge from the Main Hospital.  The average daily discharge from this outfall as reported in the application is 0.0048 MGD.

Effluent from Outfall 002 consists of non-contact cooling tower blowdown from the Translational Research Building.  The average daily discharge from this outfall as reported in the application is 0.0048 MGD.

Receiving stream for both outfalls is Belhaven Creek (7Q10 = 0), designated as Fish and Wildlife.

The facility is located in the Pearl River Basin (HUC 03180002).

IV.	TOTAL MAXIMUM DAILY LOAD AND 303(d) ISSUES

No TMDL.  No 303(d) issues per the 2018 Section 303(d) list of impaired water bodies.

V.	TYPE OF WASTEWATER TREATMENT

No treatment is provided prior to release of the effluent from Outfalls 001 and 002.

VI.	EPA APPLICABLE CATEGORICAL GUIDELINES

The proposed discharge is for non-contact cooling tower blowdown so 40 CFR Part 460 – Hospital Category is not applicable. 

460.10 Applicability; description of the hospital category.
The provisions of this subpart are applicable to discharges resulting from the functional operations of the hospital point source category. 
	Federal Register: 41 Fed. Reg. 18643 (May 6, 1976) - (2) Summary of conclusions with respect to the hospital industry category (Subpart A) of the hospital industry point source category (iii) Origin of wastewater pollutants. Sources of wastewater pollutants in the hospital point source category include aqueous wastes from patient and staff sanitary waste, cafeteria, laboratory and laundry operations.

VII.	DATA FROM APPLICATION FORM 2C

	Outfall 001:
Parameter	Maximum Daily Value	# of Samples	
BOD (mg/l) 	<3.33	1	
COD (mg/l) 	26.4	1	
TOC (mg/l) 	10.8	1	
TSS (mg/l) 	1.0	1	
Ammonia (mg/l) 	<0.0317	1	
Flow (MGD) 	0.0048	Est.	
Temp °C (°F) (winter)	Ambient	-----	
Temp °C (°F) (summer)	Ambient	-----	
pH (min.-max.) (SU) 	9.86-9.86	1	
Chlorine (mg/l)	0.12	1	
Fluoride (mg/l)	2.76	1	
Nitrate-Nitrite (mg/l)	0.087	1	
Magnesium (mg/l)	0.366	1	

	Outfall 002:
Parameter	Maximum Daily Value	# of Samples	
BOD (mg/l) 	<3.33	1	
COD (mg/l) 	26.4	1	
TOC (mg/l) 	10.8	1	
TSS (mg/l) 	1.0	1	
Ammonia (mg/l) 	<0.0317	1	
Flow (MGD) 	0.0048	Est.	
Temp °C (°F) (winter)	Ambient	-----	
Temp °C (°F) (summer)	Ambient	-----	
pH (min.-max.) (SU) 	9.86-9.86	1	
Chlorine (mg/l)	0.12	1	
Fluoride (mg/l)	2.76	1	
Nitrate-Nitrite (mg/l)	0.087	1	
Magnesium (mg/l)	0.366	1	

VIII. 	WATER QUALITY LIMITATIONS BASED ON WASTELOAD ALLOCATION (WLA)

A WLA was not completed because the proposed discharge is for non-process wastewater and the data from the existing discharge provided in the application did not indicate any levels of concern for water quality parameters.

IX.       TOXICITY SCREENING

Not applicable.

X.	PROPOSED FINAL LIMITATIONS: OUTFALLS 001 & 002

					Proposed Average	Proposed Maximum	
	Parameter			Permit Limitation	Permit Limitation	Basis
	pH				6.0 SU (min)		9.0 SU (max)	MSWQS
	Flow				Report MGD		Report MGD	BTJ
	Total Residual Chlorine	0.011 mg/l		0.019 mg/l		MSWQS

MSWQS: Mississippi Water Quality Standards; BTJ: Best Technical Judgement

Total Residual Chlorine and pH shall be monitored once per discharge event with a grab sample of the effluent.  Flow shall be monitored once per discharge event instantaneously.  Sampling results shall be submitted annually.

	An anti-degradation study was completed for this project.