PRETREATMENT RATIONALE FOR MODIFICATION

BFI Waste Systems of Mississippi, LLC, Big River Landfill		Permit No.: MSP090577
Leland, Mississippi							SIC: 4953
Washington County							May 22, 2020
Permit Writer: Sherryl Couch						EPD Branch: Water II

I.	FACILITY INFORMATION

A.	Nature of Business: Municipal Solid Waste Landfill
B.	Regulated Discharge: Process wastewater discharged is generated from landfill leachate.
C.	Proposed Flowrate: 0.10 MGD
D.	Applicable Federal Regulations: 40 CFR Part 403 – General Pretreatment Regulations

II.	POTW INFORMATION

A.	Name, Permit No., & Agency Interest No.: Greenville POTW (MS0020184) (AI# 13154)
B.	Treatment Type: Activated Sludge
C.	Design Flowrate: 20 MGD
D.	Receiving Stream: Mississippi River
E.	Receiving Stream 7Q10 Flowrate (Q7/10): 120,000 cfs = 77,558 MGD

III.	MODIFICATION REQUEST

In a letter dated April 23, 2020, BFI Waste Systems of Mississippi, LLC (BFI) requested an increase in ammonia loading limitations in their pretreatment permit for monthly average from 102 lb/day to 150 lb/day and for daily maximum from 167 lb/day to 175 lb/day.  BFI indicated the reason for the requested increase is due to the increase in leachate volume from the landfill and restricted work hours for BFI employees and third-party waste haulers.  BFI also indicated the City of Greenville confirmed that the increase would be negligible and would not pose an operational concern for their plant.  The proposed modification will require a public notice review period because the increase in permit limitations is greater than 25%.