PERMIT RATIONALE FOR REISSUANCE
Rolling Hills Wastewater Inc, Rolling Hills Subdivision
Rankin County
Florence, Mississippi
Water NPDES No. MS0040134
August 19, 2019

I.	FACILITY INFORMATION

Facility Name:  	Rolling Hills Wastewater Inc, Rolling Hills Subdivision
Facility Address:  	Rolling Hills Boulevard 
	Florence, MS  39073    
Florence, 
Permit No.:  		MS0040134
SIC:  			6552
Permit Writer:  	Rusty Parrish
EPD Branch: 		Water II Branch

II.	NATURE OF BUSINESS

Rolling Hills Wastewater Inc, Rolling Hills Subdivision is an existing subdivider and developer located in Rankin County. This facility has applied for reissuance of its NPDES Permit to operate a wastewater disposal system.

III.	DESCRIPTION OF WASTEWATER
Minor Domestic

IV.	DESCRIPTION OF WASTEWATER TREATMENT
Domestic wastewater is collected and treated via a conventional lagoon.  

V.	RECEIVING WATERS
Rolling Hills Wastewater Inc, Rolling Hills Subdivision discharges into Steen Creek. Steen Creek does not appear on The State of Mississippi 303(d) List of Waterbodies for Rankin County and an applicable TMDL has not been developed. These waterbodies are in the Pearl River drainage basin and are classified as Fish and Wildlife.

VI.	APPLICABLE GUIDELINES
State of Mississippi Wastewater Regulations, State of Mississippi Water Quality Criteria, and Commercial Facility Guidelines.

VII.	SUMMARY OF DISCHARGE LIMITATIONS  
Parameter		Value					Basis
Flow			0.07 MGD				Design
BOD5			30 mg/l 				Domestic Guidelines
TSS			60 mg/l 				Domestic Guidelines
E. coli			126 Col./100mL 			MSWQS
pH			6.0 to 9.0 S.U.				MSWQS
Chlorine		0.1 to 1.0 mg/l				Domestic Guidelines

	The following pronouncement was approved by the EPA on January 18, 2017: 

“As part of the recent triennial review of MS’s Water Quality Standards, revisions were made regarding the bacterial indicator for MS’s freshwaters.
The following information summarizes the revisions made regarding bacteria as part of the recently approved revisions to the WQS regulations:

1)	 E. coli will now be the bacterial indicator used for all freshwaters in MS                     designated as Recreation, Fish and Wildlife Support, and/or Public Water Supply      (replacing the use of fecal coliform).
		
		2) 	The specific language from the WQS regulations states that:

‘Culturable E. coli should not exceed a geometric mean of 126 per 100 mL over a 30-day period, nor should the samples examined during a 30-day period exceed 410 per 100 mL more than 10% of the time.’”

Accordingly, fecal coliform has been removed from the proposed permit and replaced with E. coli.