PRETREATMENT RATIONALE FOR RENEWAL 

Caterpillar Inc, LEF, Plant 2
Alcorn County 
Corinth, Mississippi  
Water II Branch  
Agency Interest (AI) No.: 38296  

Permit No.: MSP092315
SIC Code: 3519
March 23, 2018  
Permit Writer: Carter Cress 

I.	FACILITY INFORMATION

A.	Nature of Business: This facility is a remanufacturer of engines and related components.  

B.	Process Wastewater Description: Outfall 001: non-contact wastewater consisting of cooling water from cooling tower, non-contact wastewater consisting of condensate/blowdown from air compressor, non-contact wastewater consisting of bleed-off from HVAC system, and wastewater consisting of reject water from reverse osmosis system that is used to treat incoming municipal water.  

C.	Current Flowrate: 	0.06 MGD Monthly Average;
Report Daily Maximum.  

D.	Proposed Flowrate: 	Report Monthly Average; 
Report Daily Maximum.  

E.	Applicable Federal Guidelines: 40 CFR Part 403: General Pretreatment Regulations for Existing and New Sources of Pollution.   

II.	RECEIVING POTW INFORMATION

A.	POTW Name, AI No., and Permit No.: Corinth POTW, 13090, MS0061328.  

B.	POTW Treatment Type: Oxidation ditch.   

C.	POTW Design Flowrate: 6.0 MGD.  

D.	POTW Receiving Stream: Tuscumbia River.  

E.	POTW Receiving Stream 7Q10 (Q7/10): 5.8 cfs = 3.7 MGD.  

III.	PERTINENT FLOWRATE AND LOADING DATA

A.	POTW 12-month Average Flowrate (QPOTW): 2.8045 MGD.     

POTW Monthly Average flowrate values using 12 months of recently-available DMR data (MGD):

01/17	02/17	03/17	04/17	05/17	06/17	07/17	08/17	09/17	10/17	11/17	12/17	
4.3886	3.3995	3.9125	2.9208	2.5745	2.0054	2.006	2.1746	2.7353	2.1047	2.0147	3.4176	

B.	Industrial Facilities Flowrate Data:

Facility 
(Permit No., AI No.)	Current Permitted Flow 
(Monthly Average)	Max. Monthly Average (Qw)1 	
Caterpillar Inc, LEF, Plant 2
(MSP092315, 38296)	0.06 MGD  	0.0012 MGD  	
Caterpillar Inc
(MSP090345, 288)	0.082 MGD	0.047 MGD  	
Mississippi Polymers Inc  
(MSP090351, 1646)	0.0063 MGD*	0.0063 MGD  	
Kimberly Clark Corporation, Corinth Mill
(MSP091364, 254)	0.8692 MGD*	0.8692 MGD  	
Total	1.0125 MGD	0.9237 MGD  	

1 the largest Monthly Average value listed on 12 recently-available DMRs (January 2017 – December 2017).    

*This facility has to report its Monthly Average flowrate; therefore, this is the largest Monthly Average flowrate listed on the DMRs.    

C.	Current Maximum Permitted Loads (Xta):

Parameter	Caterpillar Inc, LEF, Plant 2
(lb/day)	Caterpillar Inc  
(lb/day)	Mississippi Polymers Inc  
(lb/day)	Kimberly Clark Corporation, Corinth Mill
(lb/day)	Xtat 
(lb/day)	
Cd	0.01	0.058	---	---	0.068	
Cr	1.39	1.62	---	---	3.01	
Cu	0.15	0.092	Report  	---	0.242	
Pb	0.25	0.403	---	---	0.653	
Ni	1.25	2.32	---	---	3.57	
Ag	0.125	0.012	---	---	0.137	
Zn	1.3	1.524	---	---	2.824	
CN	0.6	0.7	---	---	1.3	
TTO	1.07	1.24	---	---	2.31    	
pH (SU)	5.5 – 9.5  	5.5 – 9.5 	6.0 – 9.0 	5.0 – 10.0  	---	

D.	Largest Monthly Average Discharge Value (Xt) using 12 months of recently-available DMR data (January 2017 – December 2017):

Parameter	Caterpillar Inc, LEF, Plant 2
(lb/day)	Caterpillar Inc  
(lb/day)	Mississippi Polymers Inc  
(lb/day)	Kimberly Clark Corporation, Corinth Mill
(lb/day)	Xtt 
(lb/day)	
Cd	NODI=B1	NODI=B	---	---	0	
Cr	NODI=B	NODI=B	---	---	0	
Cu	0.0001	0.027	0.153  	---	0.1801	
Pb	NODI=B	0.0041	---	---	0.0041	
Ni	NODI=B	0.001	---	---	0.001	
Ag	NODI=B	NODI=B	---	---	0	
Zn	0.002	0.043	---	---	0.045	
CN	0.00004  	0.002	---	---	0.00204	
TTO	0.00003*  	0.036*	---	---	0.03603	
pH (SU)	6.78 – 8.3  	7.34 – 8.41   	6.32 – 8.65  	6.08 – 8.86  	---	

1 NODI=B is an EPA indicator code that means “below detect limit/no detect.”    
 
*This facility has a permit limit for Daily Maximum only for this pollutant; therefore, this is the largest Daily Maximum listed on the DMRs.  

IV.	BACKGROUND/DOMESTIC LOADING CALCULATIONS

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

BGC = Background concentration of domestic sewage.  Values obtained from Appendix A using actual POTW and industrial facility data.  

QINDUSTRIAL = QW1 + QW2 + …
where QW is the largest Monthly Average flowrate from the DMRs over 12 months of recently-available data (January 2017 – December 2017).    

BGL (Cd) = 8.34*0.0003928*(2.8045 – 0.0482) = 		0.00903 lb/day
BGL (Cr) = 8.34*0.00396*(2.8045 – 0.0482) = 		0.0910 lb/day
BGL (Cu) = 8.34*0.0212*(2.8045 – 0.0545) = 		0.486 lb/day
BGL (Pb) = 8.34*0.00311*(2.8045 – 0.0482) = 		0.0715 lb/day
BGL (Ni) = 8.34*0.0118*(2.8045 – 0.0482) = 		0.271 lb/day
BGL (Ag) = 8.34*0.0079754*(2.8045 – 0.0482) = 		0.183 lb/day
BGL (Zn) = 8.34*0.0568*(2.8045 – 0.0482) = 		1.31 lb/day
BGL (CN) = 8.34*0.008326*(2.8045 – 0.0482) = 		0.191 lb/day

V.	WATER QUALITY ANALYSIS

A.	Instream Wastewater Concentration

IWC, % = [QPOTW / (QPOTW + Q7/10)] x 100 = [2.8045/(2.8045 + 3.7)]*100 =  43 %

Since IWC > 1%, both acute and chronic screening are developed.  

B.	Allowable Water Quality Criteria (AWQC) Headworks Loading Calculations

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

CCRITICAL = Critical Concentration; obtained from State of Mississippi Water Quality Criteria for Intrastate, Interstate, and Coastal Waters: Freshwater Acute and Chronic Values.  Adopted June 28, 2012.  

RPOTW = Removal efficiency, in decimal form.  Values obtained from Appendix B using actual POTW data or MDEQ-observed study data for those pollutants lacking POTW-specific data.  

ACUTE SCREENING:  

AWQC (Cd) = 8.34*0.00103*(3.7 + 2.8045)/(1 – 0.63) = 		0.151 lb/day
AWQC (Cr) = 8.34*0.323*(3.7 + 2.8045)/(1 – 0.69) = 		56.5 lb/day
AWQC (Cu) = 8.34*0.0070*(3.7 + 2.8045)/(1 – 0.83) = 		2.23 lb/day
AWQC (Pb) = 8.34*0.030*(3.7 + 2.8045)/(1 – 0.86) = 		11.6 lb/day
AWQC (Ni) = 8.34*0.260*(3.7 + 2.8045)/(1 – 0.18) = 		17.2 lb/day
AWQC (Ag) = 8.34*0.00098*(3.7 + 2.8045)/(1 – 0.75) =	 	0.213 lb/day
AWQC (Zn) = 8.34*0.065*(3.7 + 2.8045)/(1 – 0.51) = 		7.20 lb/day
AWQC (CN) = 8.34*0.0220*(3.7 + 2.8045)/(1 – 0.62) = 		3.14 lb/day

CHRONIC SCREENING:  

AWQC (Cd) = 8.34*0.00015*(3.7 + 2.8045)/(1 – 0.63) = 		0.0220 lb/day
AWQC (Cr) = 8.34*0.042*(3.7 + 2.8045)/(1 – 0.69) = 		7.35 lb/day
AWQC (Cu) = 8.34*0.0050*(3.7 + 2.8045)/(1 – 0.83) = 		1.60 lb/day
AWQC (Pb) = 8.34*0.00118*(3.7 + 2.8045)/(1 – 0.86) = 		0.457 lb/day
AWQC (Ni) = 8.34*0.029*(3.7 + 2.8045)/(1 – 0.18) = 		1.92 lb/day
AWQC (Ag) = 8.34*NA*(3.7 + 2.8045)/(1 – 0.75) = 		NA
AWQC (Zn) = 8.34*0.065*(3.7 + 2.8045)/(1 – 0.51) = 		7.20 lb/day
AWQC (CN) = 8.34*0.0052*(3.7 + 2.8045)/(1 – 0.62) = 		0.742 lb/day

NA = no critical concentration for chronic silver screening is available from either Mississippi or EPA guidelines.  

VI.	POTW INHIBITION ANALYSIS (HEADWORKS INHIBITION, HWI)

HWI, 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: Table 3-2 Activated Sludge Inhibition Threshold Levels.  For the silver parameter, the minimum reported inhibition threshold is utilized.  For all other parameters, 1.0 mg/L is used since this value is near the minimum side of the minimum reported range of inhibition threshold levels.  

HWI (Cd) = 8.34*2.8045*1.0 = 			23.4 lb/day
	HWI (Cr) = 8.34*2.8045*1.0 = 			23.4 lb/day
	HWI (Cu) = 8.34*2.8045*1.0 = 			23.4 lb/day
	HWI (Pb) = 8.34*2.8045*1.0 = 			23.4 lb/day
	HWI (Ni) = 8.34*2.8045*1.0 = 			23.4 lb/day
	HWI (Ag) = 8.34*2.8045*0.25 = 			5.85 lb/day
	HWI (Zn) = 8.34*2.8045*1.0 = 			23.4 lb/day
	HWI (CN) = 8.34*2.8045*1.0 = 			23.4 lb/day  

VII.	LIMITING CASE (LC) SUMMARY TABLE

Parameter	HWI (lb/day)	Acute AWQC (lb/day)	Chronic AWQC (lb/day)	Acute
LC*
(lb/day)	Chronic 
LC*
(lb/day)	BGL (lb/day)	Xtat (lb/day)	Xtt (lb/day)	BGL < LC (Pass/Fail)	Xtat < LC (Pass/Fail)	Xtt < LC (Pass/Fail)	
Cadmium (Cd)	23.4	0.151	0.0220	0.151	0.0220	0.00903	0.068	0	PASS	FAIL	PASS	
Chromium (Cr)	23.4	56.5	7.35	23.4	7.35	0.0910	3.01	0	PASS	PASS	PASS	
Copper (Cu)	23.4	2.23	1.60	2.23	1.60	0.486	0.242	0.1801	PASS	PASS	PASS	
Lead (Pb)	23.4	11.6	0.457	11.6	0.457	0.0715	0.653	0.0041	PASS	FAIL	PASS	
Nickel (Ni)	23.4	17.2	1.92	17.2	1.92	0.271	3.57	0.001	PASS	FAIL	PASS	
Silver (Ag)	5.85	0.213	NA	0.213	NA	0.183	0.137	0	PASS	PASS	PASS	
Zinc (Zn)	23.4	7.20	7.20	7.20	7.20	1.31	2.824	0.045	PASS	PASS	PASS	
Cyanide (CN)	23.4	3.14	0.742	3.14	0.742	0.191	1.3	0.00204	PASS	FAIL	PASS	

*If AWQC < HWI, then LC = AWQC; if AWQC > HWI, then LC = HWI.  

NA = no critical concentration for chronic silver screening is available from either Mississippi or EPA guidelines.  

VIII.	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 = (LC, lb/day – BGL, lb/day) x (QI, MGD / QT, MGD)

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

where,
PAI 	=	Permit allocation for indirect discharger
CALLOW=	Allowable concentration for indirect discharger
QI	=	Applicant’s permitted process discharge 
QT	=	Total industrial contributory flow for pertinent pollutants
LC	=	Limiting case loading
BGL	=	Background/domestic loading

QT (MGD) Table:

Facility	Cd	Cr	Cu	Pb	Ni	Ag	Zn	CN	
Caterpillar Inc, LEF, Plant 2	0.007*	0.007*	0.007*	0.007*	0.007*	0.007*	0.007*	0.007*	
Caterpillar Inc	0.082	0.082	0.082	0.082	0.082	0.082	0.082	0.082	
Mississippi Polymers Inc  	---	---	0.0063**	---	---	---	---	---	
Kimberly Clark Corporation, Corinth Mill	---	---	---	---	---	---	---	---	
Total	0.089	0.089	0.0953	0.089	0.089	0.089	0.089	0.089	

*This value is the largest Daily Maximum flowrate reported on the facility’s DMRs since 2015.  

**This facility has to report its flowrates; therefore, this is the largest Monthly Average flowrate listed on 12 months of recently available DMRs (January 2017 – December 2017).    

ACUTE:  

PAI (Cd) = (0.151 – 0.00903)*(0.007/0.089) = 	0.0112 lb/day
CALLOW (Cd) = 0.0112/(8.34*0.007) = 		0.192 mg/L

PAI (Cr) = (23.4 – 0.0910)*(0.007/0.089) = 		1.83 lb/day
CALLOW (Cd) = 1.83/(8.34*0.007) = 			31.3 mg/L

PAI (Cu) = (2.23 – 0.486)*(0.007/0.0953) = 		0.128 lb/day
CALLOW (Cu) = 0.128/(8.34*0.007) = 			2.19 mg/L

PAI (Pb) = (11.6 – 0.0715)*(0.007/0.089) = 		0.907 lb/day
CALLOW (Pb) = 0.907/(8.34*0.007) = 			15.5 mg/L

PAI (Ni) = (17.2 – 0.271)*(0.007/0.089) = 		1.33 lb/day
CALLOW (Ni) = 1.33/(8.34*0.007) = 			22.8 mg/L
	
PAI (Ag) = (0.213 – 0.183)*(0.007/0.089) = 		0.00236 lb/day
CALLOW (Ag) = 0.00236/(8.34*0.007) = 		0.0404 mg/L

PAI (Zn) = (7.20 – 1.31)*(0.007/0.089) = 		0.463 lb/day
CALLOW (Zn) = 0.463/(8.34*0.007) = 			7.93 mg/L

PAI (CN) = (3.14 – 0.191)*(0.007/0.089) = 		0.232 lb/day
CALLOW (CN) = 0.232/(8.34*0.007) = 		3.97 mg/L

CHRONIC:  

PAI (Cd) = (0.0220 – 0.00903)*(0.007/0.089) = 	0.00102 lb/day
CALLOW (Cd) = 0.00102/(8.34*0.007) = 		0.0175 mg/L

PAI (Cr) = (7.35 – 0.0910)*(0.007/0.089) = 		0.571 lb/day
CALLOW (Cd) = 0.571/(8.34*0.007) = 			9.78 mg/L

PAI (Cu) = (1.60 – 0.486)*(0.007/0.0953) = 		0.0818 lb/day
CALLOW (Cu) = 0.0818/(8.34*0.007) = 		1.40 mg/L

PAI (Pb) = (0.457 – 0.0715)*(0.007/0.089) = 		0.0303 lb/day
CALLOW (Pb) = 0.0303/(8.34*0.007) = 		0.519 mg/L

PAI (Ni) = (1.92 – 0.271)*(0.007/0.089) = 		0.130 lb/day
CALLOW (Ni) = 0.130/(8.34*0.007) = 			2.23 mg/L
	
PAI (Ag) = (NA – 0.183)*(0.007/0.089) = 		NA lb/day
CALLOW (Ag) = NA/(8.34*0.007) = 			NA mg/L

PAI (Zn) = (7.20 – 1.31)*(0.007/0.089) = 		0.463 lb/day
CALLOW (Zn) = 0.463/(8.34*0.007) = 			7.93 mg/L

PAI (CN) = (0.742 – 0.191)*(0.007/0.089) = 		0.0433 lb/day
CALLOW (CN) = 0.0433/(8.34*0.007) = 		0.742 mg/L

NA = no critical concentration for chronic silver screening is available from either Mississippi or EPA guidelines.    

IX.	PROPOSED PERMIT LIMITATIONS – OUTFALL 001

Parameter	Allowable
Loads and Concentrations	
Current Permit Limits
	
Proposed Permit Limits	

Sampling Frequency 

	Sample 
Type	Basis of Decision1	
	Acute
(lb/day)
(mg/L)	Chronic
(lb/day)
(mg/L)	Avg.
(lb/day)	Max. (lb/day)	Avg. (mg/L)	Max. (mg/L)	
Avg. (lb/day)	
Max. (lb/day)	Avg. (mg/L)	Max. (mg/L)				
Cadmium (Cd)	0.0112
0.192	0.00102
0.0175	0.005	0.01	0.01	0.025	---	---	---	---	---	---	BJ	
Chromium (Cr)	1.83
31.3	0.571
9.78	0.86	1.39	1.71	2.77	---	---	---	---	---	---	BJ	
Copper (Cu)	0.128
2.19	0.0818
1.40	0.09	0.15	0.18	0.30	---	---	---	---	---	---	BJ	
Lead (Pb)	0.907
15.5	0.0303
0.519	0.1	0.25	0.2	0.5	---	---	---	---	---	---	BJ	
Nickel (Ni)	1.33
22.8	0.130
2.23	0.5	1.25	1.0	2.5	---	---	---	---	---	---	BJ	
Silver (Ag)	0.00236
0.0404	NA
NA	0.05	0.125	0.1	0.25	---	---	---	---	---	---	BJ	
Zinc (Zn)	0.463
7.93	0.463
7.93	0.74	1.3	1.48	2.61	---	---	---	---	---	---	BJ	
Cyanide (CN)	0.232
3.97	0.0433
0.742	0.33	0.6	0.65	1.2	---	---	---	---	---	---	BJ	
Total Toxic Organics (TTO)  	---
---	---
---	---	1.07	---	2.13	---	---	---	---	---	---	BJ	

Parameter	Current Permit Limits	Proposed Permit Limits	Sampling Frequency	Sample Type	Basis of Decision1	
pH	5.5 – 9.5 SU  	5.5 – 9.5 SU	Weekly  	Grab	CPL	

Parameter	Current Permit Limits	Proposed Permit Limits	Sampling Frequency	Sample Type	Basis of Decision1	
Flow	0.06 MGD Monthly Average;
Report Daily Maximum  	Report Monthly Average;
Report Daily Maximum	Continuously  	Continuous Recorder   	BJ	

1 Basis of Decision: BJ = Best Judgment; CPL = Current Permit Limit.  

X.	STATEMENT OF BASIS (narrative)

This facility’s operations have been governed by Federal regulation 40 CFR Part 433: Metal Finishing Point Source Category.  However, currently all sources of contact process wastewater are either not in operation or the process wastewater produced is routed to holding tanks.  The holding tanks are periodically discharged to a regulated off-site disposal company.  Currently, no contact process wastewater is discharged to the POTW for treatment.  The only process wastewater currently discharged to the POTW is non-contact that arises from the cooling tower, the HVAC system, the air compressor, and the reverse osmosis system utilized to treat incoming municipal water.  Accordingly, it has been determined that 40 CFR Part 433 no longer applies for process wastewater discharges from this facility’s operations.       

The only categorically-regulated metallic pollutants that registered a detectable level as shown in the permit renewal application were copper and zinc.  The analytical testing revealed that the values for copper and zinc were well below the currently-active permit limits.  Therefore, all categorically-regulated pollutant limits have been removed from the proposed permit.  

The permitted Monthly Average flowrate has been changed from 0.06 MGD to Report in accordance with the removal of all sources of contact process wastewater discharges.  

Since permit limits for many pollutants have been eliminated in the proposed renewal permit, a public notice will be required.  

APPENDIX A

BACKGROUND CONCENTRATION OF DOMESTIC SEWAGE*

Cadmium (Cd):		BGC = 	0.0003928 mg/L**
Chromium (Cr):		BGC = 	0.00396 mg/L
Copper (Cu):		BGC = 	0.0212 mg/L
Lead (Pb):			BGC = 	0.00311 mg/L
Nickel (Ni):			BGC = 	0.0118 mg/L
Silver (Ag):			BGC = 	0.0079754 mg/L**
Zinc (Zn):			BGC = 	0.0568 mg/L
Cyanide (CN):		BGC = 	0.008326 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.  

**Due to inadequate data from the POTW for this pollutant, this value is the background concentration that was utilized in the currently-active permit’s rationale document.  The currently-active permit was issued on August 9, 2013.  

	December 2014	January 2015	February 2015	March 2015	April 2015	May 2015  	
Corinth POTW  

Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

4.7125
No data
No data	

4.743
No data
No data	

4.7945
No data
No data	

7.5166
No data
No data	

5.9829
No data
No data	

3.7322
No data
No data	
Caterpillar Inc, LEF, Plant 2

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.000745
NODI=B
NODI=B	

0.000701
NODI=B
NODI=B	

0.000653
NODI=B
NODI=B	

0.000417
NODI=B
NODI=B	

0.00095
NODI=B
NODI=B	

0.00042
NODI=B
NODI=B	
Caterpillar Inc   

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0295
NODI=B
NODI=B	

0.0177
NODI=B
NODI=B	

0.025
NODI=B
NODI=B	

0.028
NODI=B
NODI=B	

0.037
NODI=B
NODI=B	

0.0224
NODI=B
NODI=B	
Mississippi Polymers Inc

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0022
Not permitted 
Not permitted	

0.0024
Not permitted 
Not permitted	

0.0022
Not permitted 
Not permitted	

0.0021
Not permitted 
Not permitted	

0.0023
Not permitted 
Not permitted	

0.002
Not permitted 
Not permitted	
Kimberly Clark Corporation, Corinth Mill

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.498624
Not permitted 
Not permitted 	

0.549902
Not permitted 
Not permitted	

0.6714
Not permitted 
Not permitted	

0.7149
Not permitted 
Not permitted	

0.6799
Not permitted 
Not permitted	

0.4520
Not permitted 
Not permitted	
DOMESTIC FLOW, MGD:	4.682255	4.744599	4.768847	7.488183	5.94495	3.70938	
DOMESTIC LOAD, lb/day:	No data	No data	No data	No data	No data	No data	
DOMESTIC CONC., mg/L:	No data	No data	No data	No data	No data	No data	
DATA FOR CADMIUM (Cd) BACKGROUND/DOMESTIC CONCENTRATION

Average Domestic Concentration for Cadmium (Cd) = BGC = 0.0003928 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.  

	December 2014	January 2015	February 2015	March 2015	April 2015	May 2015  	
Corinth POTW  

Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

4.7125
0.00171
0.0672	

4.743
0.001375
0.0544	

4.7945
0.00221
0.0883	

7.5166
0.009985
0.626	

5.9829
0.00483
0.241	

3.7322
0.00354
0.110	
Caterpillar Inc, LEF, Plant 2

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.000745
NODI=B
NODI=B	

0.000701
NODI=B
NODI=B	

0.000653
NODI=B
NODI=B	

0.000417
NODI=B
NODI=B	

0.00095
NODI=B
NODI=B	

0.00042
NODI=B
NODI=B	
Caterpillar Inc   

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0295
NODI=B
NODI=B	

0.0177
NODI=B
NODI=B	

0.025
NODI=B
NODI=B	

0.028
NODI=B
NODI=B	

0.037
NODI=B
NODI=B	

0.0224
NODI=B
NODI=B	
Mississippi Polymers Inc

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0022
Not permitted 
Not permitted	

0.0024
Not permitted 
Not permitted	

0.0022
Not permitted 
Not permitted	

0.0021
Not permitted 
Not permitted	

0.0023
Not permitted 
Not permitted	

0.002
Not permitted 
Not permitted	
Kimberly Clark Corporation, Corinth Mill

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.498624
Not permitted 
Not permitted 	

0.549902
Not permitted 
Not permitted	

0.6714
Not permitted 
Not permitted	

0.7149
Not permitted 
Not permitted	

0.6799
Not permitted 
Not permitted	

0.4520
Not permitted 
Not permitted	
DOMESTIC FLOW, MGD:	4.682255	4.744599	4.768847	7.488183	5.94495	3.70938	
DOMESTIC LOAD, lb/day:	0.0672	0.0544	0.0883	0.626	0.241	0.110	
DOMESTIC CONC., mg/L:	0.00172	0.00138	0.00222	0.0100	0.00486	0.00356	
DATA FOR CHROMIUM (Cr) BACKGROUND/DOMESTIC CONCENTRATION

Average Domestic Concentration for Chromium (Cr) = BGC = 0.00396 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.  

	December 2014	January 2015	February 2015	March 2015	April 2015	May 2015  	
Corinth POTW  

Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

4.7125
0.0157
0.617	

4.743
0.0413
1.63	

4.7945
0.0345
1.38	

7.5166
0.01338
0.839	

5.9829
0.00604
0.301	

3.7322
0.0185
0.576	
Caterpillar Inc, LEF, Plant 2

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.000745
0.021
0.00003	

0.000701
0.02
0.000003	

0.000653
0.011
0.000062	

0.000417
0.006
0.000001	

0.00095
0.01
0.00002	

0.00042
0.01
0.00004	
Caterpillar Inc   

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0295
0.023
0.0049	

0.0177
0.013
0.0023	

0.025
0.042
0.0087	

0.028
0.025
0.0065	

0.037
0.049
0.0079	

0.0224
0.063
0.0209	
Mississippi Polymers Inc

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0022
0.128
0.002	

0.0024
0.416 
0.005	

0.0022
0.679 
0.013	

0.0021
0.318 
0.006	

0.0023
0.952 
0.019	

0.002
0.959 
0.016	
Kimberly Clark Corporation, Corinth Mill

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.498624
Not permitted 
Not permitted 	

0.549902
Not permitted 
Not permitted	

0.6714
Not permitted 
Not permitted	

0.7149
Not permitted 
Not permitted	

0.6799
Not permitted 
Not permitted	

0.4520
Not permitted 
Not permitted	
DOMESTIC FLOW, MGD:	4.680055	4.722199	4.766647	7.486083	5.94265	3.70738	
DOMESTIC LOAD, lb/day:	0.61007	1.622697	1.358238	0.826499	0.27408	0.53906	
DOMESTIC CONC., mg/L:	0.0156	0.0412	0.0342	0.0132	0.00553	0.0174	
DATA FOR COPPER (Cu) BACKGROUND/DOMESTIC CONCENTRATION

Average Domestic Concentration for Copper (Cu) = BGC = 0.0212 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.  

	December 2014	January 2015	February 2015	March 2015	April 2015	May 2015  	
Corinth POTW  

Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

4.7125
0.00442
0.174	

4.743
0.00247
0.0977	

4.7945
0.00196
0.0784	

7.5166
0.00339
0.212	

5.9829
0.00301
0.150	

3.7322
0.00333
0.104	
Caterpillar Inc, LEF, Plant 2

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.000745
NODI=B
NODI=B	

0.000701
NODI=B
NODI=B	

0.000653
NODI=B
NODI=B	

0.000417
NODI=B
NODI=B	

0.00095
NODI=B
NODI=B	

0.00042
NODI=B
NODI=B	
Caterpillar Inc   

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0295
NODI=B
NODI=B	

0.0177
NODI=B
NODI=B	

0.025
NODI=B
NODI=B	

0.028
NODI=B
NODI=B	

0.037
NODI=B
NODI=B	

0.0224
0.006
0.002	
Mississippi Polymers Inc

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0022
Not permitted 
Not permitted	

0.0024
Not permitted 
Not permitted	

0.0022
Not permitted 
Not permitted	

0.0021
Not permitted 
Not permitted	

0.0023
Not permitted 
Not permitted	

0.002
Not permitted 
Not permitted	
Kimberly Clark Corporation, Corinth Mill

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.498624
Not permitted 
Not permitted 	

0.549902
Not permitted 
Not permitted	

0.6714
Not permitted 
Not permitted	

0.7149
Not permitted 
Not permitted	

0.6799
Not permitted 
Not permitted	

0.4520
Not permitted 
Not permitted	
DOMESTIC FLOW, MGD:	4.682255	4.744599	4.768847	7.488183	5.94495	3.70938	
DOMESTIC LOAD, lb/day:	0.174	0.0977	0.0784	0.212	0.150	0.102	
DOMESTIC CONC., mg/L:	0.00446	0.00247	0.00197	0.00340	0.00303	0.00330	
DATA FOR LEAD (Pb) BACKGROUND/DOMESTIC CONCENTRATION

Average Domestic Concentration for Lead (Pb) = BGC = 0.00311 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.  

	December 2014	January 2015	February 2015	March 2015	April 2015	May 2015  	
Corinth POTW  

Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

4.7125
No data
No data	

4.743
0.00743
0.294	

4.7945
0.00659
0.263	

7.5166
0.0131
0.821	

5.9829
0.0144
0.718	

3.7322
0.01705
0.531	
Caterpillar Inc, LEF, Plant 2

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.000745
0.005
0.000007	

0.000701
NODI=B
NODI=B	

0.000653
NODI=B
NODI=B	

0.000417
NODI=B
NODI=B	

0.00095
NODI=B
NODI=B	

0.00042
NODI=B
NODI=B	
Caterpillar Inc   

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0295
NODI=B
NODI=B	

0.0177
NODI=B
NODI=B	

0.025
0.006
0.0012	

0.028
NODI=B
NODI=B	

0.037
NODI=B
NODI=B	

0.0224
NODI=B
NODI=B	
Mississippi Polymers Inc

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0022
Not permitted 
Not permitted	

0.0024
Not permitted 
Not permitted	

0.0022
Not permitted 
Not permitted	

0.0021
Not permitted 
Not permitted	

0.0023
Not permitted 
Not permitted	

0.002
Not permitted 
Not permitted	
Kimberly Clark Corporation, Corinth Mill

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.498624
Not permitted 
Not permitted 	

0.549902
Not permitted 
Not permitted	

0.6714
Not permitted 
Not permitted	

0.7149
Not permitted 
Not permitted	

0.6799
Not permitted 
Not permitted	

0.4520
Not permitted 
Not permitted	
DOMESTIC FLOW, MGD:	4.682255	4.744599	4.768847	7.488183	5.94495	3.70938	
DOMESTIC LOAD, lb/day:	No data	0.294	0.2618	0.821	0.718	0.531	
DOMESTIC CONC., mg/L:	No data	0.00743	0.00658	0.0131	0.0145	0.0172	
DATA FOR NICKEL (Ni) BACKGROUND/DOMESTIC CONCENTRATION

Average Domestic Concentration for Nickel (Ni) = BGC = 0.0118 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.  

	December 2014	January 2015	February 2015	March 2015	April 2015	May 2015  	
Corinth POTW  

Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

4.7125
No data
No data	

4.743
No data
No data	

4.7945
No data
No data	

7.5166
No data
No data	

5.9829
No data
No data	

3.7322
No data
No data	
Caterpillar Inc, LEF, Plant 2

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.000745
NODI=B
NODI=B	

0.000701
NODI=B
NODI=B	

0.000653
NODI=B
NODI=B	

0.000417
NODI=B
NODI=B	

0.00095
NODI=B
NODI=B	

0.00042
NODI=B
NODI=B	
Caterpillar Inc   

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0295
NODI=B
NODI=B	

0.0177
NODI=B
NODI=B	

0.025
NODI=B
NODI=B	

0.028
NODI=B
NODI=B	

0.037
NODI=B
NODI=B	

0.0224
NODI=B
NODI=B	
Mississippi Polymers Inc

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0022
Not permitted 
Not permitted	

0.0024
Not permitted 
Not permitted	

0.0022
Not permitted 
Not permitted	

0.0021
Not permitted 
Not permitted	

0.0023
Not permitted 
Not permitted	

0.002
Not permitted 
Not permitted	
Kimberly Clark Corporation, Corinth Mill

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.498624
Not permitted 
Not permitted 	

0.549902
Not permitted 
Not permitted	

0.6714
Not permitted 
Not permitted	

0.7149
Not permitted 
Not permitted	

0.6799
Not permitted 
Not permitted	

0.4520
Not permitted 
Not permitted	
DOMESTIC FLOW, MGD:	4.682255	4.744599	4.768847	7.488183	5.94495	3.70938	
DOMESTIC LOAD, lb/day:	No data	No data	No data	No data	No data	No data	
DOMESTIC CONC., mg/L:	No data	No data	No data	No data	No data	No data	
DATA FOR SILVER (Ag) BACKGROUND/DOMESTIC CONCENTRATION

Average Domestic Concentration for Silver (Ag) = BGC = 0.0079754 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.  

	December 2014	January 2015	February 2015	March 2015	April 2015	May 2015  	
Corinth POTW  

Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

4.7125
0.103
4.05	

4.743
0.0423
1.67	

4.7945
0.04105
1.64	

7.5166
0.047
2.95	

5.9829
0.03025
1.51	

3.7322
0.08075
2.51	
Caterpillar Inc, LEF, Plant 2

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.000745
0.095
0.000135	

0.000701
0.91
0.000152	

0.000653
0.02
0.000113	

0.000417
0.031
0.000007	

0.00095
0.548
0.0011	

0.00042
0.021
0.0001	
Caterpillar Inc   

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0295
0.045
0.0095	

0.0177
0.051
0.009	

0.025
0.127
0.0262	

0.028
0.082
0.0212	

0.037
0.226
0.0366	

0.0224
0.271
0.0897	
Mississippi Polymers Inc

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0022
Not permitted 
Not permitted	

0.0024
Not permitted 
Not permitted	

0.0022
Not permitted 
Not permitted	

0.0021
Not permitted 
Not permitted	

0.0023
Not permitted 
Not permitted	

0.002
Not permitted 
Not permitted	
Kimberly Clark Corporation, Corinth Mill

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.498624
Not permitted 
Not permitted 	

0.549902
Not permitted 
Not permitted	

0.6714
Not permitted 
Not permitted	

0.7149
Not permitted 
Not permitted	

0.6799
Not permitted 
Not permitted	

0.4520
Not permitted 
Not permitted	
DOMESTIC FLOW, MGD:	4.682255	4.744599	4.768847	7.488183	5.94495	3.70938	
DOMESTIC LOAD, lb/day:	4.040365	1.660848	1.613687	2.928793	1.4723	2.4202	
DOMESTIC CONC., mg/L:	0.103	0.0420	0.0406	0.0469	0.0297	0.0783	
DATA FOR ZINC (Zn) BACKGROUND/DOMESTIC CONCENTRATION

Average Domestic Concentration for Zinc (Zn) = BGC = 0.0568 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.  

	December 2014	January 2015	February 2015	March 2015	April 2015	May 2015  	
Corinth POTW  

Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

4.7125
No data
No data	

4.743
No data
No data	

4.7945
No data
No data	

7.5166
No data
No data	

5.9829
No data
No data	

3.7322
No data
No data	
Caterpillar Inc, LEF, Plant 2

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.000745
NODI=B
NODI=B	

0.000701
NODI=B
NODI=B	

0.000653
NODI=B
NODI=B	

0.000417
NODI=B
NODI=B	

0.00095
0.006
0.00001	

0.00042
NODI=B
NODI=B	
Caterpillar Inc   

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0295
NODI=B
NODI=B	

0.0177
NODI=B
NODI=B	

0.025
NODI=B
NODI=B	

0.028
NODI=B
NODI=B	

0.037
NODI=B
NODI=B	

0.0224
NODI=B
NODI=B	
Mississippi Polymers Inc

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.0022
Not permitted 
Not permitted	

0.0024
Not permitted 
Not permitted	

0.0022
Not permitted 
Not permitted	

0.0021
Not permitted 
Not permitted	

0.0023
Not permitted 
Not permitted	

0.002
Not permitted 
Not permitted	
Kimberly Clark Corporation, Corinth Mill

Flow*, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.498624
Not permitted 
Not permitted 	

0.549902
Not permitted 
Not permitted	

0.6714
Not permitted 
Not permitted	

0.7149
Not permitted 
Not permitted	

0.6799
Not permitted 
Not permitted	

0.4520
Not permitted 
Not permitted	
DOMESTIC FLOW, MGD:	4.682255	4.744599	4.768847	7.488183	5.94495	3.70938	
DOMESTIC LOAD, lb/day:	No data	No data	No data	No data	No data	No data	
DOMESTIC CONC., mg/L:	No data	No data	No data	No data	No data	No data	
DATA FOR CYANIDE (CN) BACKGROUND/DOMESTIC CONCENTRATION

Average Domestic Concentration for Cyanide (CN) = BGC = 0.008326 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.  

APPENDIX B

REMOVAL EFFICIENCIES – Corinth POTW       

(Calculated and displayed in table on the next page)

1 Removal Efficiency = [(<inf.> - <eff.>)/<inf.>]*100, where <inf.> is the average influent value and <eff.> is the average effluent value.

Yellow Shaded Values were excluded because either the inf. > eff. or inf. = eff. for the same sample date.  

*Due to inadequate data from the actual POTW, MDEQ-observed study data for activated sludge systems was used.  An oxidation ditch is a modified activated sludge system.    

[mg/L]	

12/19/14	

1/2/15	

1/16/15	

1/30/15	

2/13/15	

2/27/15	

3/13/15	

3/27/15	

4/10/15

4/24/15	

5/8/15	

5/22/15	
Removal Efficiency1	
Cd
Inf.	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	

63 %*	
Cd
Eff.	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect		
Cr
Inf.	0.00171	No detect	0.00163	0.00112	0.00222	0.0022	0.017	0.00297	0.00681	0.00285	0.00392	0.00316	

69 %
	
Cr
Eff.	0.000988	No detect	0.000495	0.000494	0.00117	No detect	0.000914	0.00226	0.00248	0.00246	0.00135	0.00151		
Cu
Inf.	0.0157	0.0119	0.0715	0.0405	0.0319	0.0371	0.00816	0.0186	0.00394	0.00814	0.0224	0.0146	

83 %	
Cu
Eff.	0.00259	0.00272	0.00826	0.00588	0.0035	0.00211	0.000655	0.00769	0.00339	0.00528	0.00263	0.00365		
Pb
Inf.	0.00442	No detect	No detect	0.00247	0.00196	No detect	No detect	0.00339	0.00301	No detect	0.00333	No detect	

86 %	
Pb
Eff.	No detect	No detect	No detect	No detect	No detect	No detect	No detect	0.000615	0.00207	No detect	No detect	No detect		
Ni
Inf.	0.00431	0.00743	No detect 	0.00365	0.00659	0.00457	0.0131	0.00925	0.0144	0.00588	0.0203	0.0138	

18 %	
Ni
Eff.	0.00535	0.00569	0.00415	0.00435	0.00362	0.00692	0.0103	0.0111	0.0141	0.00795	0.0181	0.00993		
Ag
Inf.	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	

75 %*	
Ag
Eff.	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect		
Zn
Inf.	0.103	0.0368	0.0567	0.0334	0.0357	0.0464	0.0223	0.047	0.0375	0.023	0.113	0.0485	

51 %	
Zn
Eff.	0.0479	0.023	0.0168	0.0233	0.0137	0.00102	0.0323	0.0435	0.0341	0.0167	0.0486	0.0183		
CN
Inf.	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	

62 %*	
CN
Eff.	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect	No detect