PRETREATMENT RATIONALE FOR RENEWAL 2nd Draft

Kimberly-Clark Corp., Corinth Mill
Alcorn County
Corinth, MS
Water II Branch 
Permit No. MSP091364
SIC Code: 2297, 2676, and 2679
September 17, 2025
Permit Engineer: Rajeev Gupta

I.	FACILITY INFORMATION

A.	Nature of Business: The facility is a manufacturer of nonwovens and industrial wipers.
B.	Process Wastewater Description: Outfall 001 currently discharges 71,639 gallons per day (long term average flow) of process wastewater, cooling tower and boiler blowdown, and storm water collected in the wastewater treatment area only.  The facility is proposing to replace the pump at the retention pond to provide greater flow to Outfall 001.  When the pump is replaced, the facility expects to have an average daily discharge from Outfall 001 of 200,000 gallons per day.
Outfall 002 discharges 426,654 (long term average flow) of process wastewater from Hydroknit Unit and cooling tower and boiler blowdown only.
C.	Proposed Flowrate: Outfall 001: Report (Avg. and Max);
Outfall 002: Report (Avg. and Max) 	
D.	Applicable Federal Guidelines: 40 CFR Part 410 - Textile Mills Point Source Category; Subpart H - Nonwoven Manufacturing Category;40 CFR Part 410.84 -Pretreatment Standards for Existing Sources. Sources subject to this subpart must comply with 40 CFR Part 403, General Pretreatment Regulations.    

II.	RECEIVING POTW INFORMATION

A.	POTW Name, AI No., and Permit No.: City of Corinth POTW, AI 13090, MS0061328
B.	POTW Treatment Type: Oxidation Ditch
C.	POTW Design Flowrate: 6.0 MGD  
D.	POTW Receiving Stream: Tuscumbia River Canal
E.	POTW Receiving Stream 7Q10 (Q7/10): 3.75 MGD  

III.	PERTINENT FLOWRATE AND LOADING DATA

A.	POTW 12-month Average Flowrate (QPOTW):3.466 MGD (May 2024-April 2025)
B.	Industrial Facilities Maximum 30-day Average Flow (QIND) for Contributing Pollutants:
(obtained from May 2024 – April 2025 DMRs):

Facility (Permit No., AI No.)	Hg	Cu	Zn	Cn	Fe	Al	
Caterpillar Inc
(MSP090345, 288)	-----	0.0681	0.0681	0.0681	-----	-----	
Mississippi Polymers Inc  
(MSP090351, 1646)	-----	0.0083	-----	-----	-----	-----	
Kimberly Clark Corporation, Corinth Mill
(MSP091364, 254)	-----	-----	-----	-----	-----	-----	
NE Mississippi Regional Landfill (MSP091079, 2344)	-----	0.041	0.041	0.041	-----	-----	
Total, QIND (MGD)	-----	0.1174	0.1093	0.1093	-----	-----	

C.	Industrial Facilities Permitted/Requested Flow in MGD (QW):

Facility (Permit No., AI No.)	Hg	Cu	Zn	Cn	Fe	Al	
Caterpillar Inc
(MSP090345, 288)	-----	0.082	0.082	0.082	-----	-----	
Mississippi Polymers Inc  
(MSP090351, 1646))	-----	0.00832	-----	-----	-----	-----	
Kimberly Clark Corporation, Corinth Mill
(MSP091364, 254)	0.59863	0.5986	0.5082	0.5082	0.5986	0.0904	
NE Mississippi Regional Landfill (MSP091079, 2344)		0.075	0.075	0.075	----	----	
Total, QT (MGD)	0.5986	0.7639	0.6652	0.6652	0.5986	0.0904	
2There is no monthly average flow limit, and the daily maximum flow limit is report”; therefore, the maximum monthly average flow of “0.0083 MGD” was used as a conservative measure.
3There is no monthly average flow limit, and the daily maximum flow limit is “report”; therefore, the maximum monthly average flow value for each outfall was used as a conservative measure.  (Outfall 001 = 0.0904 MGD and Outfall 002 = 0.5082).  Zinc and Cyanide were indicated as being present only in the effluent from Outfall 002.  Aluminum was indicated only as being present in the effluent from Outfall 001.

IV.	
BACKGROUND/DOMESTIC LOADING CALCULATIONS

Background Loading (BGL), lb/d = 8.34 x BGC(mg/L)(1) x (QPOTW - QINDUSTRIAL(2))(MGD)

BGC = Background concentration of domestic sewage.  Calculated from actual POTW data as shown in Appendix A.  Background concentration data for Aluminum and Iron is not available for the Corinth POTW. 

QIND = (QW1 + QW2 + …) = Summation of maximum 30-day average flows from existing industrial dischargers (IUs) contributing a Pollutant of Concern (POC) to the POTW.

BGL (Hg) = 8.34*0.000418*(3.466-0) =		0.0121 lb/day
BGL (Cu) = 8.34*0.137*(3.466-0.1174) =		3.826 lb/day
BGL (Cyanide) = 8.34*0.00163*(3.466-0.1093) =	0.0456 lb/day
BGL (Zn) = 8.34*3.22*(3.466-0.1093) =		90.1 lb/day
BGL (Fe) = 8.34*0.989*(3.466-0) =			28.59 lb/day
BGL (Al) = 8.34*0.100*(3.466-0) =			2.891 lb/day

Iron background concentration level based on data found in EPA’s Guidance Manual on the Development and Implementation of Local Discharge Limitations Under the Pretreatment Program.  Aluminum background concentration level based on data found in Agency for Toxic Substances and Disease Registry (ATSDR) Toxicological Profiles, Toxicological Profile for Aluminum, September 2008, Table 6-3.  The background Aluminum concentration used is based on a review of the data for the State of Louisiana Aluminum levels reported in this table and further discussion found on page 195 of this document.  
V.	ALLOWABLE HEADWORKS LOADING CALCUATIONS  

Instream Wastewater Concentration (IWC), % = [QPOTW / (QPOTW + Q7/10)] x 100

IWC % = [3.466/(3.466 + 3.75)]*100 = 48 %

Acute and Chronic screenings are performed because the IWC > 1%.  

A.	AHL, Water Quality Criteria Based (AHLWQC)

AHLWQC, lb/day = 8.34 x CCRITERIA (mg/L) x (Q7/10 + QPOTW, MGD) / (1 – RPOTW)

CCRITERIA = Water Quality Criteria; obtained from State of Mississippi Water Quality Criteria for Intrastate, Interstate, and Coastal Waters: Freshwater Acute and Chronic Values.  

RPOTW = Removal efficiency, in decimal form.  Values obtained from Appendix B.  With the exception of Cyanide, Total Recoverable Aluminum, and Total Recoverable Iron, removal efficiencies for all pollutants are based on actual influent and effluent data provided by POTW.  The removal efficiency for Cyanide is based on an MDEQ-observed study for activated sludge systems.  For Iron and Aluminum, no data is available and complete pass through is assumed

Chronic Analysis, AHLCWQC:
AHLCWQC (Hg) = 8.34*N/A*(3.75+3.466)/(1-0.8625) = No Chronic Criteria
AHLCWQC (Cu) = 8.34*0.005*(3.75+3.466)/(1-0.924) = 3.959 lb/day
AHLCWQC (Cyanide) = 8.34*0.0052*(3.75+3.466)/(1-0.62) = 0.823 lb/day
AHLCWQC (Zn) = 8.34*0.065*(3.75+3.466)/(1-0.979) = 186.3lb/day
AHLCWQC (Al) = 8.34*0.140*(3.75+3.466)/(1-0) = 	8.425 lb/day
AHLCWQC (Fe) = 8.34*1.0*(3.75+3.466)/(1-0) = 60.18 lb/day

Acute Analysis, AHLAWQC:
AHLAWQC (Hg) = 8.34*0.000153*(3.75+3.466)/(1-0.8625) = 0.0669 lb/day
AHLAWQC (Cu) = 8.34*0.007*(3.75+3.466)/(1-0.924) = 5.54   lb/day
AHLAWQC (Cyanide) = 8.34*0.0220*(3.75+3.466)/(1-0.62) =3.484 lb/day 
AHLAWQC (Zn) = 8.34*0.065*(3.75+3.466)/(1-0.979) = 186.3 lb/day
AHLAWQC (Al) = 8.34*0.250*(3.75+3.466)/(1-0) = 	15.04 lb/day
AHLAWQC (Fe) = 8.34*N/A*(3.75+3.466)/(1-0) = No Acute Criteria

B.	AHL, POTW Inhibition Based (AHLINH)

AHLINH, lb/day = 8.34 x QPOTW (MGD) x CINH (mg/L)

CINH = Activated Sludge Inhibition Levels, from EPA Guidance Manual on the Development and Implementation of Local Discharge Limitations Under the Pretreatment Program: Appendix G - Activated Sludge Inhibition Levels.  For all parameters, 1.0 mg/L is used since this value is near the minimum side of the minimum reported range of inhibition threshold levels.  Inhibition threshold levels could not be found for Iron and Aluminum.

	AHLINH (Hg) = 8.34*3.466*1.0 = 		28.9 lb/day
	AHLINH (Cu) = 8.34*3.466*1.0 = 		28.9 lb/day
	AHLINH (Cyanide) = 8.34*3.466*1.0 = 	29.9 lb/day
	AHLINH (Zn) = 8.34*3.466*1.0 = 		29.9 lb/day

C.	AHL, POTW NPDES Permit Limit Based (AHLNPDES)

If the POTW has a limit for a specific parameter, industrial loading is limited to the amount the POTW can accept and still meet the limit.  The POTW’s NPDES Permit is in the process of being modified for new limits for Total Recoverable Copper for concentration.  The permit will not contain loading limits.  However, the facility has a monthly average flow limit of 6.0 MGD.

AHLCNPDES (Cu) = 0.008 mg/L * 8.34 *6.0 = 0.40 lbs/day
AHLANPDES (Cu) = 0.011 mg/L * 8.34 *6.0 = 0.55 lbs/day

VI.	MAXIMUM ALLOWABLE HEADWORKS LOADINGS AND LIMITING CASE

Parameter	AHLINH (lb/day)	AHLCWQC (lb/day)	AHLAWQC (lb/day)	AHLCNPDES (lb/day)	AHLANPDES (lb/day)	MAHLC
(lb/day)	MAHLA
(lb/day)	BGL (lb/day)	LC
(lb/day)	Allocation Available
(BGL < LC)	
Mercury	28.9	---	0.0669	None	None	---	0.0669	0.0121	0.0669	Allocation	
Copper	28.9	3.959	5.54	0.40	0.55	0.40	0.55	3.826	0.40	No Allocation	
Cyanide	28.9	0.823	3.484	None	None	0.823	3.484	0.0456	0.823	Allocation	
Zinc	28.9	186.3	186.3	None	None	28.9	28.9	90.1	28.9	No Allocation	
Aluminum	---	8.425	15.04	None	None	8.425	15.04	2.891	8.425	Allocation	
Iron	---	60.18	---	None	None	60.18	---	28.59	60.18	Allocation	

    	MAHLC = smallest chronic AHL = comparison of AHLINH, AHLCWQC, and AHLCNPDES
	MAHLA = smallest acute AHL = comparison of AHLINH, AHLAWQC, and AHLANPDES
	LC = smallest of MAHLC and MAHLA

VII.	DEVELOPMENT OF ALLOWABLE CONCENTRATIONS

The remaining industrial wasteload allocation will be used in calculating allowable acute and 
chronic concentrations using the “Industrial User (IU) Contributory Flow” method as 
described in EPA’s Local Limits Development Guidance (EPA 833-R-04-002A, July 2004).  
	
PAI, lb/day = (MAHL, lb/day – BGL, lb/day) x (QW, MGD / QT, MGD)

CALLOW, mg/L = (PAI, lb/day) / (8.34 x QW, MGD)

PAI =	Permit allocation for indirect discharger
CALLOW =	Allowable concentration for indirect discharger
QW	=	Applicant’s permitted/requested process discharge 
QT	=	Total industrial contributory flow for pertinent pollutants
MAHL	=	MAHLC to be used for chronic and MAHLA to be used for acute
BGL	=	Background/domestic loading  

	OUTFALL 001

	CHRONIC (Average):

	PAI (Al) = (8.425-2.891)*(0.200/0.200) =			5.534 lb/day
	CALLOW (Al) = 5.534/(8.34*0.200) =			3.318 mg/L

	PAI (Fe) = (60.18-28.59)*(0.200/(0.5986+0.128361)) =	8.69 lb/day
	CALLOW (Fe) = 8.69/(8.34*0.200) =			5.21 mg/L

	ACUTE (Maximum):

	PAI (Hg) = (0.0669-0.0121)*(0.200/(0.5986+0.128361) =0.015 lb/day
	CALLOW (Hg) =0.015/(8.34*0.200) =			0.009 mg/L

	PAI (Al) = (15.04-2.891)*(0.200/0.200) =			12.149 lb/day
	CALLOW (Al) = 12.149/(8.34*0.200) =			7.28 mg/L

	OUTFALL 002

	CHRONIC (Average):

PAI (Cyanide) = (0.823-0.0456)*(0.5082/0.6652) =	0.5939 lb/day
CALLOW (Cyanide) = 0.5939/(8.34*0.5082) =		0.14 mg/L

	PAI (Fe) = (60.18-28.59)*(0.5082/(0.5986+0.128361)) =	22.08 lb/day
	CALLOW (Fe) = 22.08/(8.34*0.5082) =			5.21 mg/L

	ACUTE (Maximum):

	PAI (Hg) = (0.0669-0.0121)*(0.5082)/(0.5986+0.128361) =0.0383 lb/day
	CALLOW (Hg) =0.0383/(8.34*0.5082) =			0.009 mg/L

PAI (Cyanide) = (3.484-0.0456)*(0.5082/0.6652) =	2.626 lb/day
	CALLOW (Cyanide) =2.626 /(8.34*0.5082) =		0.619 mg/L

	
VIII.	PROPOSED PERMIT LIMITATIONS

A.	 Outfall 001

Parameter	Allowable Concentration (ALL)	Categorical Limits (CAT)	Current Permit
Limits (CPL)	Proposed Permit 
Limits (PPL)	Basis	
	Avg. (mg/L)	Max. (mg/L)	Avg. (mg/L)	Max. (mg/L)	Avg. (mg/L)	Max. (mg/L)	Max. Monthly
Avg. (mg/L)	Max. (mg/L)		
Ammonia (as N)	-----	-----	-----	-----	Report	Report	Report	Report	CPL	
Oil and Grease	-----	-----	-----	-----	Report	Report	Report	Report	CPL	
BOD5	-----	-----	-----	-----	Report	Report	Report	Report	CPL	
TSS	-----	-----	-----	-----	Report	Report	Report	Report	CPL	
Flow	----	-----	-----	-----	Report	Report	Report	Report	CPL	
pH	----	-----	-----	-----	5.0 SU (min)	10.0 SU	6.0 SU (min)	9.0 SU	City	
Copper, TR	----	----	-----	-----	-----	-----	Report	Report	TJ	
Iron, TR	5.21	-----	-----	-----	-----	-----	-----	-----	TJ	
Mercury, TR	----	0.009	-----	-----	-----	-----	-----	-----	TJ	
Aluminum, TR	3.318	7.28	-----	-----	-----	-----	-----	-----	TJ	
TJ = Technical Judgement
TR = Total Recoverable 
PPL is the smallest of ALL, CAT, and CPL, average and maximum, respectively 

Flow shall be measured daily with a Continuous Recorder.  BOD, TSS, Total Recoverable Copper and Ammonia (as N) shall be monitored twice per month with a 24-Hour Composite sample of the effluent.  pH and Oil and Grease shall be monitored twice per month with a grab sample of the effluent.  No Iron, Mercury, and Aluminum monitoring is being proposed as the allowable concentrations are significantly higher than what is reported in the application.  Total Recoverable Copper monitoring is being added to the permit based on Technical Judgement.  

The pH limits are being changed based on an e-mail request from the City of Corinth.

B.	 Outfall 002

Parameter	Allowable Concentration (ALL)	Categorical Limits (CAT)	Current Permit
Limits (CPL)	Proposed Permit 
Limits (PPL)	Basis	
	Avg. (mg/L)	Max. (mg/L)	Avg. (mg/L)	Max. (mg/L)	Avg. (mg/L)	Max. (mg/L)	Max. Monthly
Avg. (mg/L)	Max. (mg/L)		
Ammonia (as N)	-----	-----	-----	-----	Report	Report	Report	Report	CPL	
Oil and Grease	-----	-----	-----	-----	Report	Report	Report	Report	CPL	
BOD5	-----	-----	-----	-----	Report	Report	Report	Report	CPL	
TSS	-----	-----	-----	-----	Report	Report	Report	Report	CPL	
Flow	----	-----	-----	-----	Report	Report	Report	Report	CPL	
pH	----	-----	-----	-----	5.0 SU (min)	10.0 SU	6.0 SU (min)	9.0 SU	City	
Zinc, TR	----	----	-----	-----	-----	-----	-----	-----	TJ	
Copper, TR	----	----	-----	-----	-----	-----	Report	Report	TJ	
Iron, TR	5.21	-----	-----	-----	-----	-----	-----	-----	TJ	
Mercury, TR	----	0.009	-----	-----	-----	-----	-----	-----	TJ	
Cyanide	0.14 	0.619	-----	-----	-----	-----	Report	Report	TJ	

TJ = Technical Judgement
TR = Total Recoverable 
PPL is the smallest of ALL, CAT, and CPL, average and maximum, respectively 

Flow shall be measured daily with a Continuous Recorder.  BOD, TSS, Total Recoverable Copper and Ammonia (as N) shall be monitored twice per month with a 24-Hour Composite sample of the effluent.  pH, Cyanide and Oil and Grease shall be monitored twice per month with a grab sample of the effluent.  No Iron and Mercury monitoring is being proposed as the allowable concentrations are significantly higher than what is reported in the application.  Total Recoverable Copper and Cyanide monitoring is being added to the permit based on Technical Judgement.  No Total Recoverable Zinc monitoring is being proposed as the concentration for Zinc reported in the effluent is much lower than the background concentration calculated.  Cyanide monitoring shall be conducted as ug free cyanide as (CN)/L.

No changes are being made to the proposed limitations for Outfall 002 from the original draft permit.  

The pH limits are being changed based on an e-mail request from the City of Corinth.

		 
APPENDIX A

BACKGROUND CONCENTRATION OF DOMESTIC SEWAGE

Copper (Cu)			BGC =		0.137 mg/L
Cyanide			BGC =		0.00163 mg/L
Zinc (Zn)			BGC =		3.22 mg/L
Mercury (Hg)			BGC =		0.000418 mg/L

*These values were obtained from the 8 tables that follow in the subsequent pages.
BGC was calculated by summing the domestic concentrations of the individual samples and then dividing this amount by the number of these samples.

DATA FOR COPPER (Cu) BACKGROUND DOMESTIC CONCENTRATION

Date	08/10/23	08/18/23	09/01/23	09/15/23	09/29/23	10/13/23	10/27/23	11/10/23	11/24/23	12/08/23	12/22/23	1/5/24	
Corinth POTW	
Flow*, MGD:	3.4967	3.4967	2.024	2.024	2.024	2.0496	2.0496	2.1025	2.1025	2.2756	2.2756	4.3555	
Conc., mg/L:	0.0203	0.184	0.230	0.340	0.0190	0.0204	0.0396	0.0140	0.160	0.0292	0.0312	0.0019	
Load, lb/day:	0.591	5.36	3.8824	5.7393	0.3207	0.3487	0.6769	0.2455	2.8056	0.5542	0.5921	0.0690	
Caterpillar Inc
	
Flow*, MGD:	0.0289	0.0289	0.01862	0.01862	0.01862	0.0336	0.0336	0.0308	0.0308	0.0262	0.0262	0.03104	
Conc., mg/L:	0.0058	0.0058	0.024	0.024	0.024	0.016	0.016	0.018	0.018	0.019	0.019	ND2	
Load, lb/day:	0.00139	0.00139	0.0037	0.0037	0.0037	0.0045	0.0045	0.0046	0.0046	0.0042	0.0042	ND2	
Mississippi Polymers Inc  
	
Flow*, MGD:	0.0022	0.0022	0.0014	0.0014	0.0014	0.0015	0.0015	0.0017	0.0017	0.002	0.002	0.0029	
Conc., mg/L:	0.079	0.079	0.576	0.576	0.576	0.64	0.64	0.381	0.381	0.237	0.237	0.161	
Load, lb/day:	0.0014	0.0014	0.0067	0.0067	0.0067	0.0080	0.0080	0.0054	0.0054	0.0040	0.0040	0.0039	
Kimberly Clark Corporation, Corinth Mill												
	
Flow*, MGD:	0.4528	0.4528	0.5403	0.5403	0.5403	0.76	0.76	0.677	0.677	0.597	0.597	0.5117	
Conc., mg/L:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Load, lb/day:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
NE Mississippi Regional Landfill												
	
Flow*, MGD:	0.0336	0.0336	0.0336	0.0336	0.0336	0.034	0.034	0.034	0.034	0.034	0.034	0.0389	
Conc., mg/L:	0.0198	0.0198	0.0198	0.0198	0.0198	0.0126	0.0126	0.0126	0.0126	0.0126	0.0126	0.274	
Load, lb/day:	0.0055	0.0055	0.0055	0.0055	0.0055	0.0036	0.0036	0.0036	0.0036	0.0036	0.0036	0.0889	
DOMESTIC FLOW, MGD:	2.9792	2.9792	1.43008	1.43008	1.43008	1.2205	1.2205	1.359	1.359	1.6164	1.6164	3.77096	
DOMESTIC CONC., mg/L:	0.0234	0.215	0.324	0.479	0.025	0.0326	0.064	0.020	0.2463	0.040	0.043	0.000757	
DOMESTIC LOAD, lb/day:	0.582	5.352	3.86	5.72	0.3048	0.3326	0.6608	0.2319	2.792	0.5424	0.5803	-0.0238	
Average Domestic Concentration for Copper (Cu) = BGC = 0.137 mg/l.  *These values are the Averages listed on the DMRs. Average values are preferred over Maximum values because they present a more representative model of the facility’s typical effluent. Maximum Daily Values used when Average values are not available.   1ND = no data available.  2NODI=B is an EPA indicator code that means “below detect limit/ no detect.”

DATA FOR CYANIDE BACKGROUND DOMESTIC CONCENTRATION
Date	08/10/23	08/18/23	09/01/23	09/15/23	09/29/23	10/13/23	10/27/23	11/10/23	11/24/23	12/08/23	12/22/23	1/5/24	
Corinth POTW	
Flow*, MGD:	3.4967	3.4967	2.024	2.024	2.024	2.0496	2.0496	2.1025	2.1025	2.2756	2.2756	4.3555	
Conc., mg/L:	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	
Load, lb/day:	0.04377	0.04377	0.025322	0.0253	0.025	0.025	0.025	0.0263	0.0263	0.0284	0.0284	0.054	
Caterpillar Inc
	
Flow*, MGD:	0.0289	0.0289	0.01862	0.01862	0.01862	0.0336	0.0336	0.0308	0.0308	0.0262	0.0262	0.03104	
Conc., mg/L:	0.0032	0.0032	ND2	ND2	ND2	ND2	ND2	0.008	0.008	0.03	0.03	ND2	
Load, lb/day:	0.00077	0.0007713	ND2	ND2	ND2	ND2	ND2	0.002055	0.002055	0.006555	0.006555	ND2	
Mississippi Polymers Inc  
	
Flow*, MGD:	0.0022	0.0022	0.0014	0.0014	0.0014	0.0015	0.0015	0.0017	0.0017	0.002	0.002	0.0029	
Conc., mg/L:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Load, lb/day:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Kimberly Clark Corporation, Corinth Mill												
	
Flow*, MGD:	0.4528	0.4528	0.5403	0.5403	0.5403	0.76	0.76	0.677	0.677	0.597	0.597	0.5117	
Conc., mg/L:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Load, lb/day:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
NE Mississippi Regional Landfill												
	
Flow*, MGD:	0.0336	0.0336	0.0336	0.0336	0.0336	0.034	0.034	0.034	0.034	0.034	0.034	0.0389	
Conc., mg/L:	0.013	0.013	0.013	0.013	0.013	0.02	0.02	0.02	0.02	0.02	0.02	0.016	
Load, lb/day:	0.0036	0.00364	0.0036	0.0036	0.003643	0.005671	0.005671	0.005671	0.005671	0.005671	0.005671	0.005191	
DOMESTIC FLOW, MGD:	2.9792	2.9792	1.43008	1.43008	1.43008	1.2205	1.2205	1.359	1.359	1.6164	1.6164	3.77096	
DOMESTIC CONC., mg/L:	0.00158	0.00158	0.0018	0.0018	0.00179	0.00189	0.00189	0.00163	0.00163	0.00119	0.00119	0.001552	
DOMESTIC LOAD, lb/day:	0.0394	0.039359	0.021722	0.0217	0.021357	0.019329	0.019329	0.018574	0.018574	0.016174	0.016174	0.048809	

Average Domestic Concentration for Cyanide = BGC = 0.00163 mg/L.  *These values are the Averages listed on the DMRs. Average values are preferred over Maximum values because they present a more representative model of the facility’s typical effluent.  Maximum Daily Values used when Average values are not available.  1ND = no data available.  2ND is an EPA indicator code that means “below detect limit/ no detect.”

DATA FOR ZINC (Zn) BACKGROUND DOMESTIC CONCENTRATION
Date	08/10/23	08/18/23	09/01/23	09/15/23	09/29/23	10/13/23	10/27/23	11/10/23	11/24/23	12/08/23	12/22/23	1/5/24	
Corinth POTW	
Flow*, MGD:	3.4967	3.4967	2.024	2.024	2.024	2.0496	2.0496	2.1025	2.1025	2.2756	2.2756	4.3555	
Conc., mg/L:	0.800	1.11	1.51	7.81	0.40	3.36	5.29	2.42	0.929	0.926	2.01	0.025	
Load, lb/day:	23.32	32.37	25.48	131.834	6.752	57.434	90.4254	42.434	16.28	17.57	38.146	0.9081	
Caterpillar Inc
	
Flow*, MGD:	0.0289	0.0289	0.01862	0.01862	0.01862	0.0336	0.0336	0.0308	0.0308	0.0262	0.0262	0.03104	
Conc., mg/L:	0.0396	0.0396	0.234	0.234	0.234	0.063	0.063	0.097	0.097	0.17	0.17	0.071	
Load, lb/day:	0.0095446	0.0095446	0.036338	0.036338	0.036338	0.017654	0.017654	0.024917	0.024917	0.037146	0.037146	0.01838	
Mississippi Polymers Inc  
	
Flow*, MGD:	0.0022	0.0022	0.0014	0.0014	0.0014	0.0015	0.0015	0.0017	0.0017	0.002	0.002	0.0029	
Conc., mg/L:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Load, lb/day:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Kimberly Clark Corporation, Corinth Mill												
	
Flow*, MGD:	0.4528	0.4528	0.5403	0.5403	0.5403	0.76	0.76	0.677	0.677	0.597	0.597	0.5117	
Conc., mg/L:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Load, lb/day:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
NE Mississippi Regional Landfill												
	
Flow*, MGD:	0.0336	0.0336	0.0336	0.0336	0.0336	0.034	0.034	0.034	0.034	0.034	0.034	0.0389	
Conc., mg/L:	5.48	5.48	5.48	5.48	5.48	1.01	1.01	1.01	1.01	1.01	1.01	0.816	
Load, lb/day:	1.535	1.535	1.535	1.5356	1.535	0.286	0.286	0.286	0.286	0.2866	0.2863	0.2647	
DOMESTIC FLOW, MGD:	2.9792	2.9792	1.43008	1.43008	1.43008	1.2205	1.2205	1.359	1.359	1.6164	1.6164	3.77096	
DOMESTIC CONC., mg/L:	0.876398	2.58453	2.00460	10.9217	0.5089	5.6125	7.951403	3.7165	1.1845	1.279	1.2022	0.87639	
DOMESTIC LOAD, lb/day:	21.77546	30.82546	23.90866	130.2621	5.180662	57.13035	90.12175	42.12308	15.96908	17.24625	37.82255	0.62502	

Average Domestic Concentration for Zinc (Zn) = BGC = 3.22 mg/L.  *These values are the Averages listed on the DMRs. Average values are preferred over Maximum values because they present a more representative model of the facility’s typical effluent.   Maximum Daily Values used when Average values are not available.  1ND = no data available.  2NODI=B is an EPA indicator code that means “below detect limit/ no detect.”

DATA FOR MERCURY (Hg) BACKGROUND DOMESTIC CONCENTRATION
Date	08/10/23	08/18/23	09/01/23	09/15/23	09/29/23	10/13/23	10/27/23	11/10/23	11/24/23	12/08/23	12/22/23	1/5/24	
Corinth POTW	
Flow*, MGD:	3.4967	3.4967	2.024	2.024	2.024	2.0496	2.0496	2.1025	2.1025	2.2756	2.2756	4.3555	
Conc., mg/L:	0.000065	0.00105	0.00072	0.00074	0.00010	0.00010	0.00010	0.00010	0.0004	0.00010	0.00010	0.00010	
Load, lb/day:	0.001896	0.030621	0.012154	0.012491	0.001688	0.001709	0.001709	0.001753	0.007014	0.001898	0.001898	0.003632	
Caterpillar Inc
	
Flow*, MGD:	0.0289	0.0289	0.01862	0.01862	0.01862	0.0336	0.0336	0.0308	0.0308	0.0262	0.0262	0.03104	
Conc., mg/L:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Load, lb/day:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Mississippi Polymers Inc  
	
Flow*, MGD:	0.0022	0.0022	0.0014	0.0014	0.0014	0.0015	0.0015	0.0017	0.0017	0.002	0.002	0.0029	
Conc., mg/L:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Load, lb/day:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Kimberly Clark Corporation, Corinth Mill												
	
Flow*, MGD:	0.4528	0.4528	0.5403	0.5403	0.5403	0.76	0.76	0.677	0.677	0.597	0.597	0.5117	
Conc., mg/L:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Load, lb/day:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
NE Mississippi Regional Landfill												
	
Flow*, MGD:	0.0336	0.0336	0.0336	0.0336	0.0336	0.034	0.034	0.034	0.034	0.034	0.034	0.0389	
Conc., mg/L:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
Load, lb/day:	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	ND1	
DOMESTIC FLOW, MGD:	2.9792	2.9792	1.43008	1.43008	1.43008	1.2205	1.2205	1.359	1.359	1.6164	1.6164	3.77096	
DOMESTIC CONC., mg/L:	7.63084E-05	0.001232	0.001019	0.001047	0.000142	0.000168	0.000168	0.000155	0.000619	0.000141	0.000141	0.000115	
DOMESTIC LOAD, lb/day:	0.001896	0.030621	0.012154	0.012491	0.001688	0.001709	0.001709	0.001753	0.007014	0.001898	0.001898	0.003632	

Average Domestic Concentration for Mercury (Hg) = BGC = 0.000418 mg/L.  *These values are the Averages listed on the DMRs. Average values are preferred over Maximum values because they present a more representative model of the facility’s typical effluent.   Maximum Daily Values used when Average values are not available.  1ND = no data available.  2NODI=B is an EPA indicator code that means “below detect limit/ no detect.”

APPENDIX B

CORINTH POTW REMOVAL EFFICIENCIES

[mg/L]	08/10/23	08/18/23	09/01/23	09/15/23	09/29/23	10/13/23	10/27/23	11/10/23	11/24/23	12/08/23	12/22/23	1/5/24	Removal Efficiency1	
Cr Inf.	0.002	0.037	0.021	0.037	0.004	0.001	0.001	0.047	0.020	0.001	0.032	0.002	89.9 %	
Cr Eff.	0.003	0.003	0.002	0.002	0.003	0.004	0.005	0.003	0.003	0.004	0.004	0.004		
Cu Inf.	0.0203	0.184	0.230	0.340	0.0190	0.0204	0.0396	0.0140	0.160	0.0292	0.0312	0.0019	92.4 %	
Cu Eff.	0.0031	0.0091	0.0023	0.0096	0.0038	0.0123	0.0086	0.0072	0.0073	0.0114	0.0072	0.008		
Pb Inf.	0.0006	0.0207	0.0234	0.0351	0.0015	0.0017	0.0008	0.003	0.0151	0.0009	0.0014	0.00025	95.7%	
Pb Eff.	0.00025	0.0011	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.0008	0.00025	0.00025		
Ni Inf.	0.003	0.0333	0.0166	0.0266	0.0037	0.0031	0.0027	0.0293	0.0141	0.0033	0.0231	0.0019	79.9 %	
Ni Eff.	0.0042	0.0057	0.0053	0.0048	0.0052	0.0055	0.0059	0.0037	0.004	0.0075	0.0052	0.0047		
Ag Inf.	0.00004	0.0015	0.0022	0.0031	0.00007	0.0001	0.00006	0.00010	0.0011	0.00008	0.0001	0.00001	98.1%	
Ag Eff.	0.00001	0.00005	0.00001	0.00001	0.00001	0.00001	0.00001	0.00001	0.00001	0.00001	0.00001	0.00001		
Zn Inf.	0.800	1.11	1.51	7.81	0.40	3.36	5.29	2.42	0.929	0.926	2.01	0.025	97.9%	
Zn Eff.	0.02	0.035	0.035	0.066	0.085	0.054	0.076	0.043	0.036	0.056	0.051	0.046		
CN Inf.	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	0.0015	62 %*	
CN Eff.	0.0015	0.0015	0.0015	0.0015	0.0015	0.003	0.0015	0.0015	0.003	0.0015	0.0015	0.0015		
As Inf.	0.0028
	0.0205	0.0104	0.0151	0.0058	0.0028	0.0052	0.0203	0.009	0.0089	0.0131	0.0011	68.4%	
As. Eff.	0.0048	0.0031	0.0044	0.0057	0.0035	0.0063	0.0064	0.0025	0.0034	0.007	0.0029	0.0027		
Hg Inf. 
	0.000065	0.00105	0.00072	0.00074	0.00010	0.00010	0.00010	0.00010	0.0004	0.00010	0.00010	0.00010	
86.25%	
Hg Eff.	0.000065	0.00010	0.00010	0.00010	0.00010	0.00010	0.00010	0.00010	0.00010	0.00010	0.00010	0.00010		

1 Removal Efficiency = [(<inf.> - <eff.>)/<inf.>]*100, where <inf.> is the average influent value and <eff.> is the average effluent value.  
Grey-shaded values were excluded in calculating removal efficiencies because the influent < effluent for the same sample date.  
Blue values were used in “non-detect” results obtained from the POTW bench sheets in which the MQL (Method Quantitation Limit) was then divided by 2 to obtain the blue value.  *MDEQ-observed study removal efficiency for activated sludge systems was used due to inadequate data from the POTW.   

ADEQUACY OF TREATMENT

			Date: September 17, 2025                  
Permit Writer: Rajeev Gupta
Site: Kimberly-Clark Corp., Corinth Mill
Pretreatment Permit No. MSP091364
Alcorn County  

Proposed Increase in Flowrate: 0.025 mgd  (Northeast Mississippi Regional Landfill – Permit was recently reissued)	
Proposed Organic Loading: 2800 mg/L (Maximum value provided on application)

0.025 MGD*8.34*2800 mg/L = 583.8 lb/day 

Proposed Increase in Flowrate: 0.128361 mgd (Kimberly-Clark Corp.)
Proposed Organic Loading: 38 mg/L (Maximum value provided on application)

0.128361 MGD *8.34*38 mg/L = 40.7 lb/day

Corinth POTW, NPDES Permit No. MS0061328, AI No. 13090   
Permitted Flow:	6.0 MGD (Monthly Average Limit)
12 Months Flow:	3.56 Monthly avg. value (from January – December 2024 DMRs)
12 Months BOD5: 300 mg/L representative influent value 
Design BOD5:6 MGD*8.34*300 mg/L = 15012 lb/day  
Average BOD5: 3.56 MGD*8.34*300 mg/L = 8907 lb/day

Evaluation of Flow
6 MGD permitted – 3.56 MGD actual = 2.44 MGD 
2.44 MGD available vs. (0.025 MGD proposed increase in flowrate +0.128361 MGD proposed 
increase in flowrate)
2.44 MGD available vs 0.153 MGD proposed

Evaluation of BOD5
15012 lb/day Design– 8907 lb/day Average = 6,105 lb/day
6,105 lb/day available vs. (584 lb/day proposed + 40.7 lb/day)
6,105 lb/day available vs 624.7 lb/day proposed