PRETREATMENT RATIONALE FOR RENEWAL  

R K Metals LLC
Lee County  
Tupelo, Mississippi  
Water II Branch  
Agency Interest (AI) No.: 17866  

Permit No.: MSP092008
SIC Code: 3471
May 8, 2019  
Permit Engineer: Carter Cress

I.	         FACILITY INFORMATION

A.	Nature of Business: Electroplating metal parts.    

B.	Process Wastewater Description: Discharge created from: rinsing of parts during the process of electroplating, chemical baths from the process of electroplating, and cleaning (rinsing) of equipment and floors.  The process wastewater is expected to be discharged in batches approximately 5 days per week.     

C.	Proposed Flowrate: 	Report Quarterly Maximum,
0.0075 MGD Quarterly Average.  

D.	Applicable Federal Guidelines: 40 CFR Part 433: Metal Finishing Point Source Category.  Specifically, 40 CFR 433.17: Pretreatment Standards for New Sources (PSNS).    

II.	RECEIVING POTW INFORMATION

A.	POTW Name, AI No., and Permit No.: Tupelo POTW, 13422, MS0036111.   

B.	POTW Treatment Type: Oxidation ditch.  

C.	POTW Design Flowrate: 10.5 MGD.  

D.	POTW Receiving Stream: Town Creek.  

E.	POTW Receiving Stream 7Q10 (Q7/10): 1.2 cfs = 0.78 MGD.   

III.	PERTINENT FLOWRATE AND LOADING DATA

A.	POTW 12-month Average Flowrate (QPOTW): 7.9 MGD.    

POTW Monthly Average flowrate values using 12 months of recently-available DMR data (MGD):
01/18	02/18	03/18	04/18	05/18	06/18	07/18	08/18	09/18	10/18	11/18	12/18	
7.4	10.4	9	10.1	8	7.6	6.7	6	6.2	6.1	8.5	9	

B.	Industrial Facilities Flowrate Data:
Facility 
(Permit No., AI No.)
	Permitted Flow (Quarterly/Monthly/Daily Average)	Largest Quarterly/Monthly/Daily Average Value   
(Qw)*	
R K Metals LLC
(MSP092008, 17866)
	0 MGD1	NODI=C4	
Renin US LLC, A Division of Renin Corporation
(MSP090372, 11051)
	0.0763 MGD	0.007 MGD	
Toyota Motor Manufacturing Mississippi Inc  
(MSP092192, 23113)
	0.254 MGD2	0.254 MGD	
Sonoco Protective Solutions Inc
(MSP090739, 4104)
	0.032 MGD	0.0147 MGD	
Cooper Tire and Rubber Company
(MSP090763, 11536)
	0.288 MGD2	0.288 MGD	
T and L Specialty Company Inc
(MSP090541, 1243)
	0.004 MGD3	0.004 MGD	
Genlyte Thomas Group LLC
(MSP090285, 1202)
	0.009 MGD	0.00017 MGD	
Total	0.6633 MGD  	0.56787 MGD  	

*the largest Quarterly/Monthly/Daily Average value listed on the DMRs from January 2018 – December 2018.    

1 this facility is required to “Report” its Quarterly Average; therefore, the largest Quarterly Average value is used.  

2 this facility is required to “Report” its Monthly Average; therefore, the largest Monthly Average value is used.  

3 this facility is required to “Report” its Daily Maximum rather than an average value; therefore, the largest Daily Maximum value is used.    

4 NODI=C is an EPA indicator code that means “no discharge.”  

C.	Current Maximum Permitted Loads (Xta):  
Parameter	R K
(lb/day)	Renin (lb/day)	Toyota (lb/day)	Sonoco (lb/day)	Cooper (lb/day)	T and L (lb/day)	Genlyte (lb/day)	Xtat (lb/day)	
Cadmium (Cd)	Report 	0.032	0.038	---	---	---	0.001	0.071	
Chromium (Cr)	Report	0.095	1.41	---	---	---	0.011	1.516	
Copper (Cu)	Report	0.19	0.88	Report	1.11	Report	0.005	2.185	
Lead (Pb)	Report	0.064	0.34	---	---	---	0.0034	0.4074	
Nickel (Ni)	Report	0.095	2.81	---	---	---	0.011	2.916	
Silver (Ag)	Report	0.15	0.75	---	---	---	0.004	0.904	
Zinc (Zn)	Report	0.32	1.88	Report	1.31	Report	0.075	3.585	
Cyanide (CN)	Report	0.064	0.94	---	---	---	0.008	1.012	
Total Toxic Organics (TTO)	Report	1.36	8.88	---	---	---	0.16	10.40	
pH (units SU)	6.0 – 9.5	6.0 – 9.5	6.0 – 10.0	6.0 – 9.5	6 – 9	6.0 – 9.0	5.5 – 9.5	---	

D.	Largest Average Discharge Value (Xt)*:  
Parameter	R K
(lb/day)	Renin (lb/day)	Toyota (lb/day)	Sonoco (lb/day)	Cooper (lb/day)	T and L (lb/day)	Genlyte (lb/day)	Xtt (lb/day)	
Cadmium (Cd)	NODI=C1	NODI=B2	NODI=B	---	---	---	NODI=B	0	
Chromium (Cr)	NODI=C	NODI=B	0.008	---	---	---	0.000023	0.008023	
Copper (Cu)	NODI=C	0.002	0.048	0.0051	0.29	0.00597	0.000011	0.351081	
Lead (Pb)	NODI=C	NODI=B	0.005	---	---	---	NODI=B	0.005	
Nickel (Ni)	NODI=C	0.0009	0.441	---	---	---	0.000032	0.441932	
Silver (Ag)	NODI=C	0.0002	NODI=B	---	---	---	NODI=B	0.0002	
Zinc (Zn)	NODI=C	0.0035	0.271	0.04173	12.41	0.0116	0.000083	12.73791	
Cyanide (CN)	NODI=C	NODI=B	0.008	---	---	---	NODI=B	0.008	
Total Toxic Organics (TTO)	NODI=C	0.0005	0.069	---	---	---	NODI=B	0.0695	
pH (units SU)	NODI=C	6.8 – 7.1 	7.4 – 9.3	6.2 – 9 	7.4 – 8.4 	6 – 9	6.9 – 7.8	---	

*the largest Average discharge value listed on the DMRs from January 2018 – December 2018.  

1 NODI=C is an EPA indicator code that means “no discharge.”  

2 NODI=B is an EPA indicator code that means “below detect limit/no detect.”    

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.  Calculated from actual POTW data as shown in Appendix A.  

QINDUSTRIAL = QW1 + QW2 + …
where QW is the largest Average flowrate from the DMRs over the last twelve months (January 2018 – December 2018).  Maximum daily flow data may be used when average data is not available.  

BGL (Cd) = 8.34*0.00005*(7.9 – 0.26117) = 	0.00319 lb/day
BGL (Cr) = 8.34*0.00417*(7.9 – 0.26117) = 	0.266 lb/day
BGL (Cu) = 8.34*0.0136*(7.9 – 0.56787) = 		0.832 lb/day
BGL (Pb) = 8.34*0.00119*(7.9 – 0.26117) = 	0.0758 lb/day
BGL (Ni) = 8.34*0.00278*(7.9 – 0.26117) = 	0.177 lb/day
BGL (Ag) = 8.34*0.000190*(7.9 – 0.26117) = 	0.0121 lb/day
BGL (Zn) = 8.34*0.204*(7.9 – 0.56787) = 		12.5 lb/day
BGL (CN) = 8.34*0.0038*(7.9 – 0.26117) = 		0.242 lb/day

V.	WATER QUALITY ANALYSIS

A.	Instream Wastewater Concentration

IWC, % = [QPOTW / (QPOTW + Q7/10)] x 100 = [7.9/(7.9 + 0.78)]*100 = 91 %

IWC > 1%; therefore, 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 23, 2012.  

RPOTW = Removal efficiency, in decimal form, from actual POTW data (Appendix B) or from MDEQ-observed data for those pollutants with insufficient data.  

ACUTE SCREENING:   

AWQC (Cd) = 8.34*0.00103*(0.78 + 7.9)/(1 – 0.63) = 		0.202 lb/day
AWQC (Cr) = 8.34*0.323*(0.78 + 7.9)/(1 – 0.825) = 		134 lb/day
AWQC (Cu) = 8.34*0.0070*(0.78 + 7.9)/(1 – 0.870) = 		3.90  lb/day
AWQC (Pb) = 8.34*0.030*(0.78 + 7.9)/(1 – 0.793) = 		10.5 lb/day
AWQC (Ni) = 8.34*0.260*(0.78 + 7.9)/(1 – 0.586) = 		45.5 lb/day
AWQC (Ag) = 8.34*0.00098*(0.78 + 7.9)/(1 – 0.799) = 		0.353 lb/day
AWQC (Zn) = 8.34*0.065*(0.78 + 7.9)/(1 – 0.745) = 		18.5 lb/day
AWQC (CN) = 8.34*0.0220*(0.78 + 7.9)/(1 – 0.62) = 		4.19 lb/day

CHRONIC SCREENING:  

AWQC (Cd) = 8.34*0.00015*(0.78 + 7.9)/(1 – 0.63) = 		0.0293 lb/day
AWQC (Cr) = 8.34*0.042*(0.78 + 7.9)/(1 – 0.825) = 		17.4  lb/day
AWQC (Cu) = 8.34*0.0050*(0.78 + 7.9)/(1 – 0.870) = 		2.78 lb/day
AWQC (Pb) = 8.34*0.00118*(0.78 + 7.9)/(1 – 0.793) = 		0.413 lb/day
AWQC (Ni) = 8.34*0.029*(0.78 + 7.9)/(1 – 0.586) = 		5.07 lb/day
AWQC (Ag) = 8.34*NA*(0.78 + 7.9)/(1 – 0.799) = 			NA lb/day
AWQC (Zn) = 8.34*0.065*(0.78 + 7.9)/(1 – 0.745) = 		18.5 lb/day
AWQC (CN) = 8.34*0.0052*(0.78 + 7.9)/(1 – 0.62) = 		0.991 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 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*7.9*1.0 = 		65.9 lb/day
HWI (Cr) = 8.34*7.9*1.0 = 		65.9 lb/day
HWI (Cu) = 8.34*7.9*1.0 = 		65.9 lb/day
HWI (Pb) = 8.34*7.9*1.0 = 		65.9 lb/day
HWI (Ni) = 8.34*7.9*1.0 = 		65.9 lb/day
HWI (Ag) = 8.34*7.9*0.25 = 	16.5 lb/day
HWI (Zn) = 8.34*7.9*1.0 = 		65.9 lb/day
HWI (CN) = 8.34*7.9*1.0 = 		65.9 lb/day

I.	
VII.	LIMITING CASE (LC) SUMMARY TABLE

Parameter	HWI (lb/day)	Acute AWQC (lb/day)	Chronic AWQC (lb/day)	POTW LC1 (lb/day)	LC*  (lb/day)	BGL (lb/day)	Xtat (lb/day)	Xtt (lb/day)	BGL < LC (Pass/Fail)	Xtat < LC (Pass/Fail)	Xtt < LC (Pass/Fail)	
					Acute	Chronic							
Cadmium (Cd)	65.9	0.202	0.0293	8.90	0.202	0.0293	0.00319	0.071	0	PASS	FAIL	PASS	
Chromium (Cr)	65.9	134	17.4	56.5	56.5	17.4	0.266	1.516	0.008023	PASS	PASS	PASS	
Copper (Cu)	65.9	3.90	2.78	507	3.90	2.78	0.832	2.175	0.351081	PASS	PASS	PASS	
Lead (Pb)	65.9	10.5	0.413	31.8	10.5	0.413	0.0758	0.4074	0.005	PASS	PASS	PASS	
Nickel (Ni)	65.9	45.5	5.07	23.9	23.9	5.07	0.177	2.916	0.441932	PASS	PASS	PASS	
Silver (Ag)	16.5	0.353	NA	78.7	0.353	NA	0.0121	0.904	0.0002	PASS	FAIL	PASS	
Zinc (Zn)	65.9	18.5	18.5	388	18.5	18.5	12.5	3.585	12.73791	PASS	PASS	PASS	
Cyanide (CN)	65.9	4.19	0.991	17.3	4.19	0.991	0.242	1.012	0.008	PASS	FAIL	PASS	

1 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.  
LC (lb/day) = (8.34 x CPOTW (mg/L) x QPOTW (MGD)) / (1 – RPOTW), where CPOTW is the POTW concentration limit in mg/L.  CPOTW values are presented in page 12.  RPOTW values are presented in Appendix B.  

POTW LC (Cd) = (8.34*0.05*7.9)/(1 – 0.63) = 	8.90 lb/day
POTW LC (Cr) = (8.34*0.15*7.9)/(1 – 0.825) = 	56.5 lb/day
POTW LC (Cu) = (8.34*1.00*7.9)/(1 – 0.870) = 	507 lb/day
POTW LC (Pb) = (8.34*0.10*7.9)/(1 – 0.793) = 	31.8 lb/day
POTW LC (Ni) = (8.34*0.15*7.9)/(1 – 0.586) = 	23.9 lb/day
POTW LC (Ag) = (8.34*0.24*7.9)/(1 – 0.799) = 	78.7  lb/day
POTW LC (Zn) = (8.34*1.50*7.9)/(1 – 0.745) = 	388 lb/day
POTW LC (CN) = (8.34*0.10*7.9)/(1 – 0.62) = 	17.3 lb/day

*LC is the smallest value of the three quantities HWI, AWQC, and POTW LC.  

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

VIII.	RECENTLY-AVAILABLE DISCHARGE MONITORING REPORT (DMR) DATA

LOADS

Parameter 	Current Permit Limit	Year 2015	Year 2017	Year 2018	
Largest Average Flow	Report 	0.0075 MGD	NODI=C1	NODI=C	
Largest Maximum Flow	Report 	0.0075 MGD	NODI=C	NODI=C	
Smallest Minimum pH	6.0 SU	8 SU	NODI=C	NODI=C	
Largest Maximum pH	9.5 SU  	8.5 SU  	NODI=C	NODI=C	
Largest Average Cadmium	Report	0.0006 lb/day	NODI=C	NODI=C	
Largest Maximum Cadmium   	Report	0.0006 lb/day	NODI=C	NODI=C	
Largest Average Chromium	Report	0.006 lb/day	NODI=C	NODI=C	
Largest Maximum Chromium	Report	0.014 lb/day	NODI=C	NODI=C	
Largest Average Copper	Report	0.0008 lb/day	NODI=C	NODI=C	
Largest Maximum Copper	Report	0.0012 lb/day	NODI=C	NODI=C	
Largest Average Lead	Report	0.0031 lb/day	NODI=C	NODI=C	
Largest Maximum Lead	Report	0.0031 lb/day	NODI=C	NODI=C	
Largest Average Nickel 	Report	0.0031 lb/day	NODI=C	NODI=C	
Largest Maximum Nickel	Report	0.0031 lb/day	NODI=C	NODI=C	
Largest Average Silver	Report	0.0006 lb/day	NODI=C	NODI=C	
Largest Maximum Silver	Report	0.0006 lb/day	NODI=C	NODI=C	
Largest Average Zinc	Report 	0.08 lb/day	NODI=C	NODI=C	
Largest Maximum Zinc	Report 	0.117 lb/day	NODI=C	NODI=C	
Largest Average Cyanide	Report	0.0012 lb/day	NODI=C	NODI=C	
Largest Maximum Cyanide	Report	0.0012 lb/day	NODI=C	NODI=C	
Largest Maximum TTO	Report	NODI=B	NODI=C	NODI=C	

CONCENTRATIONS  

Parameter 	Current Permit Limit	Year 2015	Year 2017	Year 2018	
Largest Average Cadmium	Report	0.01 mg/L	NODI=C	NODI=C	
Largest Maximum Cadmium   	0.05 mg/L	0.01 mg/L	NODI=C	NODI=C	
Largest Average Chromium	Report	0.1 mg/L	NODI=C	NODI=C	
Largest Maximum Chromium	0.15 mg/L	0.23 mg/L	NODI=C	NODI=C	
Largest Average Copper	Report	0.02 mg/L	NODI=C	NODI=C	
Largest Maximum Copper	1.00 mg/L	0.02 mg/L	NODI=C	NODI=C	
Largest Average Lead	Report	0.05 mg/L	NODI=C	NODI=C	
Largest Maximum Lead	0.10 mg/L	0.05 mg/L	NODI=C	NODI=C	
Largest Average Nickel 	Report	0.05 mg/L	NODI=C	NODI=C	
Largest Maximum Nickel	0.15 mg/L	0.05 mg/L	NODI=C	NODI=C	
Largest Average Silver	Report	0.01 mg/L	NODI=C	NODI=C	
Largest Maximum Silver	0.24 mg/L	0.01 mg/L	NODI=C	NODI=C	
Largest Average Zinc	1.48 mg/L	1.28 mg/L	NODI=C	NODI=C	
Largest Maximum Zinc	1.50  mg/L	1.87 mg/L	NODI=C	NODI=C	
Largest Average Cyanide	Report	0.02 mg/L	NODI=C	NODI=C	
Largest Maximum Cyanide	0.10 mg/L	0.02 mg/L	NODI=C	NODI=C	
Largest Maximum TTO	2.13 mg/L	NODI=B	NODI=C	NODI=C	

1 NODI=C is an EPA indicator code that means “no discharge.”  

IX.	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	
R K Metals	0.0075	0.0075	0.0075	0.0075	0.0075	0.0075	0.0075	0.0075	
Renin 	0.0763	0.0763	0.0763	0.0763	0.0763	0.0763	0.0763	0.0763	
Toyota	0.254	0.254	0.254	0.254	0.254	0.254	0.254	0.254	
Sonoco	---	---	0.032	---	---	---	0.032	---	
Cooper	---	---	0.288	---	---	---	0.288	---	
T and L	---	---	0.004	---	---	---	0.004	---	
Genlyte  	0.009	0.009	0.009	0.009	0.009	0.009	0.009	0.009	
Total	0.3468	0.3468	0.6708	0.3468	0.3468	0.3468	0.6708	0.3468	

ACUTE:  

PAI (Cd) = (0.202 – 0.00319)*(0.0075/0.3468) = 	0.00430 lb/day
CALLOW (Cd) = 0.00430/(8.34*0.0075) = 		0.0687 mg/L

PAI (Cr) = (56.5 – 0.266)*(0.0075/0.3468) = 		1.22 lb/day
CALLOW (Cr) = 1.22/(8.34*0.0075) = 			19.5 mg/L

PAI (Cu) = (3.90 – 0.832)*(0.0075/0.6708) = 	0.0343 lb/day
CALLOW (Cu) = 0.0343/(8.34*0.0075) = 		0.548 mg/L

PAI (Pb) = (10.5 – 0.0758)*(0.0075/0.3468) = 	0.225 lb/day
CALLOW (Pb) = 0.225/(8.34*0.0075) = 			3.60 mg/L

PAI (Ni) = (23.9 – 0.177)*(0.0075/0.3468) = 		0.513 lb/day
CALLOW (Ni) = 0.513/(8.34*0.0075) = 			8.20 mg/L

PAI (Ag) = (0.353 – 0.0121)*(0.0075/0.3468) = 	0.00737 lb/day
CALLOW (Ag) = 0.00737/(8.34*0.0075) = 		0.118 mg/L

PAI (Zn) = (18.5 – 12.5)*(0.0075/0.6708) = 		0.0671 lb/day
CALLOW (Zn) = 0.0671/(8.34*0.0075) = 		1.07 mg/L

PAI (CN) = (4.19 – 0.242)*(0.0075/0.3468) = 	0.0854 lb/day
CALLOW (CN) = 0.0854/(8.34*0.0075) = 		1.37 mg/L

CHRONIC:  

PAI (Cd) = (0.0293 – 0.00319)*(0.0075/0.3468) = 	0.000565 lb/day
CALLOW (Cd) = 0.000565/(8.34*0.0075) = 		0.00903 mg/L

PAI (Cr) = (17.4 – 0.266)*(0.0075/0.3468) = 		0.371 lb/day
CALLOW (Cr) = 0.371/(8.34*0.0075) = 			5.93 mg/L

PAI (Cu) = (2.78 – 0.832)*(0.0075/0.6708) = 		0.0218 lb/day
CALLOW (Cu) = 0.0218/(8.34*0.0075) = 		0.349 mg/L

PAI (Pb) = (0.413 – 0.0758)*(0.0075/0.3468) = 	0.00729 lb/day
CALLOW (Pb) = 0.00729/(8.34*0.0075) = 		0.117 mg/L

PAI (Ni) = (5.07 – 0.177)*(0.0075/0.3468) = 		0.106 lb/day
CALLOW (Ni) = 0.106/(8.34*0.0075) = 			1.69 mg/L

PAI (Ag) = (NA – 0.0121)*(0.0075/0.3468) = 	NA lb/day
CALLOW (Ag) = NA/(8.34*0.0075) = 			NA mg/L  

PAI (Zn) = (18.5 – 12.5)*(0.0075/0.6708) = 		0.0671 lb/day
CALLOW (Zn) = 0.0671/(8.34*0.0075) = 		1.07 mg/L

PAI (CN) = (0.991 – 0.242)*(0.0075/0.3468) = 	0.0162 lb/day
CALLOW (CN) = 0.0162/(8.34*0.0075) = 		0.259 mg/L

NA = no critical concentration for chronic silver screening is available from either Mississippi or EPA guidelines.  
X.	DEVELOPMENT OF CATEGORICAL LIMITATIONS

A.	Regulation 40 CFR 433.17: 
Metal Finishing Point Source Category
PRETREATMENT STANDARDS FOR NEW SOURCES (PSNS)

Pollutant or pollutant property	Maximum for any 1 day	Monthly average shall not exceed	
   	Milligrams per liter (mg/L)	
Cadmium (T)	0.11	0.07	
Chromium (T)	2.77	1.71	
Copper (T)	3.38	2.07	
Lead (T)	0.69	0.43	
Nickel (T)	3.98	2.38	
Silver (T)	0.43	0.24	
Zinc (T)	2.61	1.48	
Cyanide (T)	1.20	0.65	
TTO	2.13		

A.	Calculated LOAD limits based on the historical flowrate of 0.0075 MGD:

Parameter					Daily Max.				Monthly Avg.

Cadmium (Cd)	0.11*8.34*0.0075 = 	0.00688 lb/day	0.07*8.34*0.0075 = 	0.00438 lb/day
Chromium (Cr)	2.77*8.34*0.0075 = 	0.173 lb/day	1.71*8.34*0.0075 = 	0.107 lb/day
Copper (Cu)		3.38*8.34*0.0075 = 	0.211 lb/day	2.07*8.34*0.0075 = 	0.129 lb/day
Lead (Pb)		0.69*8.34*0.0075 = 	0.0432 lb/day	0.43*8.34*0.0075 = 	0.0269 lb/day
Nickel (Ni)		3.98*8.34*0.0075 = 	0.249 lb/day	2.38*8.34*0.0075 = 	0.149 lb/day
Silver (Ag)		0.43*8.34*0.0075 = 	0.0269 lb/day	0.24*8.34*0.0075 = 	0.0150 lb/day
Zinc (Zn)		2.61*8.34*0.0075 = 	0.163 lb/day	1.48*8.34*0.0075 = 	0.0926 lb/day
Cyanide (CN)		1.20*8.34*0.0075 = 	0.0751 lb/day	0.65*8.34*0.0075 = 	0.0407 lb/day
TTO			2.13*8.34*0.0075 = 	0.133 lb/day

XI.	DEVELOPMENT OF POTW-SPECIFIC LIMITATIONS

A.	City of Tupelo Water and Light Department – Sewer Use Ordinance Limits:

Parameter	Maximum Concentration (mg/L)	
5-day Biochemical Oxygen Demand (BOD)	300.00	
Total Kjeldahl Nitrogen (TKN)	40.00	
Oil and Grease (O&G)	50.00	
Total Suspended Solids (TSS)	300.00	
Arsenic (As)	0.05	
Barium (Ba)	1.00	
Boron (B)	1.00	
Selenium (Se)	0.05	
Mercury (Hg)	0.02	
Cadmium (Cd)	0.05	
Chromium (Cr)	0.15	
Copper (Cu)	*	
Lead (Pb)		0.10	
Nickel (Ni)	0.15	
Silver (Ag)	*	
Zinc (Zn)	*	
Cyanide (CN)	0.10	

*
Industrial Category	Flow (gallons per day = gpd)	
Minor Dischargers	Less than 10,000	
Moderate Dischargers	Between 10,000 – 100,000 	
Major Dischargers	More than 100,000	

Industrial Category	Copper (Cu)
(mg/L)	Silver (Ag)
(mg/L)	Zinc (Zn)
(mg/L)	
Minor Dischargers	1.00	0.24	1.50	
Moderate Dischargers	0.30	0.24	0.50	
Major Dischargers 	0.10	0.24	0.20	

B.	Concentration (mg/L) Limits:  

Parameter		Daily Max. (mg/L)			Monthly Avg. (mg/L)**

Cadmium (Cd)	0.05					0.05*(2/3) = 		0.03
Chromium (Cr)	0.15					0.15*(2/3) = 		0.10
Copper (Cu)		1.00					1.00*(2/3) = 		0.67  
Lead (Pb)		0.10					0.10*(2/3) = 		0.067
Nickel (Ni)		0.15					0.15*(2/3) = 		0.10
Silver (Ag)		0.24					0.24*(2/3) = 		0.16
Zinc (Zn)		1.50					1.50*(2/3) =		1.00
Cyanide (CN)		0.10					0.10*(2/3) = 		0.067

C.	Load (lb/day) Limits, based on historical flowrate of 0.0075 MGD:
  
Parameter		Daily Max. (lb/day)			Monthly Avg. (lb/day)**

Cadmium (Cd)	0.05*8.34*0.0075 = 	0.00313	0.00313*(2/3) = 	0.00209
Chromium (Cr)	0.15*8.34*0.0075 = 	0.00938	0.00938*(2/3) = 	0.00625
Copper (Cu)		1.00*8.34*0.0075 = 	0.0626		0.0626*(2/3) = 	0.0417
Lead (Pb)		0.10*8.34*0.0075 = 	0.00626	0.00626*(2/3) = 	0.00417
Nickel (Ni)		0.15*8.34*0.0075 = 	0.00938	0.00938*(2/3) = 	0.00625
Silver (Ag)		0.24*8.34*0.0075 = 	0.0150		0.0150*(2/3) = 	0.0100
Zinc (Zn)		1.50*8.34*0.0075 = 	0.0938		0.0938*(2/3) = 	0.0625
Cyanide (CN)		0.10*8.34*0.0075 = 	0.00626	0.00626*(2/3) = 	0.00417

**the City of Tupelo agreed to allow the average permit limits to be calculated as 2/3 of the maximum values specified in the Sewer Use Ordinance Limits.  

XII.      PROPOSED PERMIT LIMITATIONS – OUTFALL 001
Parameter	
Allowable Loads and Concentrations	Categor-ical Limits
(mg/L)	City of Tupelo Sewer Use Ordinance Limits	
Current Permit Limits
	
Proposed Permit Limits	Sampling Frequency 	Sample Type	Basis of Decision1	
	Acute
(lb/day)
(mg/L)	Chronic
(lb/day)
(mg/L)	Max.
Avg.	Max.
(lb/day)
(mg/L)	Avg.
(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)				
Cd	0.00430
0.0687	0.000565
0.00903	0.11
0.07	0.00313
0.05	0.00209
0.03	Report	Report	Report	0.05	Report	Report	0.03	0.05	Monthly 	Grab 	SUO	
Cr	1.22
19.5	0.371
5.93	2.77
1.71	0.00938
0.15	0.00625
0.10	Report	Report	Report	0.15	Report	Report	0.10	0.15	Monthly	Grab	SUO
	
Cu	0.0343
0.548	0.0218
0.349	3.38
2.07	0.0626
1.00	0.0417
0.67	Report	Report	Report	1.00	Report	Report	0.349	0.548	Monthly	Grab	ALL	
Pb	0.225
3.60	0.00729
0.117	0.69
0.43	0.00626
0.10	0.00417
0.067	Report	Report	Report	0.10	Report	Report	0.067	0.10	Monthly	Grab	SUO	
Ni	0.513
8.20	0.106
1.69	3.98
2.38	0.00938
0.15	0.00625
0.10	Report	Report	Report	0.15	Report	Report	0.10	0.15	Monthly	Grab	SUO	
Ag	0.00737
0.118	NA
NA	0.43
0.24	0.0150
0.24	0.0100
0.16	Report	Report	Report	0.24	Report	Report	0.118	0.118	Monthly	Grab	ALL	
Zn	0.0671
1.07	0.0671
1.07	2.61
1.48	0.0938
1.50	0.0625
1.00	Report	Report	1.48	1.50	Report	Report	1.00	1.07	Monthly	Grab	ALL/
SUO  	
CN	0.0854
1.37	0.0162
0.259  	1.20
0.65	0.00626
0.10	0.00417
0.067	Report	Report	Report	0.10	Report	Report	0.067	0.10	Monthly	Grab	SUO	
TTO	---
---	---
---	2.13
---	---
---	---
---	---	Report	---	2.13	---	Report	---	2.13	Quarterly  	Grab	CAT	

Parameter	Reported Min.**	Reported Max.**	Current Permit Limits	Proposed Permit Limits	Sampling Frequency	Sample Type	Basis of Decision1	
pH	NODI=C	NODI=C	6.0 – 9.5 SU  	6.0 – 9.5 SU	Monthly 	Grab	CPL	

Parameter	Reported Largest   Quarterly Max.** 	Reported Largest Quarterly Avg.** 	Current Permit Limits	Proposed Permit Limits	Sampling Frequency	Sample Type	Basis of Decision1	
Flow	NODI=C	NODI=C	Report Quarterly Max., Report Quarterly Avg.    	Report Quarterly Max., 0.0075 MGD Quarterly Avg.  	Monthly	Batch	BTJ	
1 Basis of Decision: SUO = Sewer Use Ordinance; ALL = Allowable Limitation; CAT = Categorical Limitation; CPL = Current Permit Limitation; BTJ = Best Technical Judgment.     

**these values are the most extreme (either max. or min.) incident obtained from the most recently-available 12 months of DMR data (January 2018 – December 2018).      

XIII:	STATEMENT OF BASIS (narrative)

In an e-mail received by MDEQ on April 30, 2019, the plant manager stated that the current facility address (703 Westmoreland Drive) is and will no longer be used for any industrial processes.  The new address for the facility’s operations is 127 Godfrey Road.  Furthermore, the only industrial process that will take place at this new facility is electroplating metal parts.  The facility is in the process of installing a wastewater treatment system at the new location.  The installation is expected to be completed by June 2019; the resumption of process wastewater discharge is expected to resume soon afterwards.  Accordingly, Condition S-1 on page 2 of the proposed permit has been added:

“Within one hundred eighty (180) days after the commencement of discharge, the permittee shall submit a completed Pretreatment Form 2P application.  Based upon the results of the analyses, the permit may be reopened and reissued to reflect this data.”  [11 Miss. Admin. Code Pt. 6, R. 1.1.1.B(1).]          

In the currently-active permit, numerical limits were identified only for quarterly maximums; the quarterly average levels only needed to be reported.  This facility’s industrial operations fall under the governance of Federal regulation 40 CFR Part 433 – Metal Finishing Point Source Category.  This regulation requires that covered facilities not exceed daily maximum and monthly average limits for metallic pollutants.  Accordingly, the facility shall provide its daily maximum and maximum monthly average levels for these pollutants on its quarterly DMRs rather than the quarterly maximum and quarterly average levels in the proposed permit.  

Concentration limits for copper, silver, and zinc have been lowered in the proposed permit to comply with the calculated allowable concentration values.  

The permitted flowrate limits have been changed in the proposed permit from report quarterly maximum and report quarterly average to report quarterly maximum and 0.0075 MGD quarterly average.    

Condition L-1 on page 1 of the proposed permit has been added:

“The permittee shall not augment the use of process wastewater or otherwise dilute the wastewater as a partial or total substitute for adequate treatment to achieve compliance with this permit.”  [40 CFR 433.17(c)]    

Condition T-1 on page 21 of the proposed permit has been added:

“The term "Total Toxic Organics" is defined as the summation of all quantifiable values greater than 0.01 mg/L for the list of toxic organics found in 40 CFR 433.11(e).”  [40 CFR 433.11(e)]  
Condition T-2 on page 21 of the proposed permit has been added:

“The permittee may, in lieu of monitoring TTO, submit a toxic organic management plan for review and approval.  Upon approval, the permittee may discontinue monitoring for TTO, but the following certification statement must be made in the comment section of every discharge monitoring report (DMR) submitted: 

‘Based on my inquiry of the person or persons directly responsible for managing compliance with the permit limitations (or pretreatment standard) for total toxic organics (TTO), I certify that, to the best of my knowledge or belief, no dumping of concentrated toxic organics into the wastewater has occurred since filing of the last discharge monitoring report.  I further certify that this facility is implementing the toxic organic management plan submitted to the permitting or control authority.’”  [40 CFR 433.12]      

Please note: Federal regulation 40 CFR Part 433 – Metal Finishing Point Source Category has been determined to be the proper regulation that would govern the facility’s process wastewater discharge.  Federal regulation 40 CFR Part 413 – Electroplating Point Source Category is not applicable because this regulation applies to existing (prior to 1984) indirect dischargers.  This facility is not existing since it was not performing the industrial activities prior to 1984; therefore, this regulation does not apply.  

APPENDIX A

BACKGROUND CONCENTRATION OF DOMESTIC SEWAGE*

Cadmium (Cd):		BGC = 0.00005 mg/L
Chromium (Cr):		BGC = 0.00417 mg/L
Copper (Cu):		BGC = 0.0136 mg/L
Lead (Pb):			BGC = 0.00119 mg/L
Nickel (Ni):			BGC = 0.00278 mg/L
Silver (Ag):			BGC = 0.000190 mg/L
Zinc (Zn):			BGC = 0.204 mg/L
Cyanide (CN):		BGC = 0.0038 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.  

Date	May 2014	June 2014	July 2014	Sept. 2014	Oct. 2014	Nov. 2014	
Tupelo POTW

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

7.1
0.000121
0.0072	

7.3
0.00005
0.0030	

6.5
0.00005
0.0027	

5.0
0.00005
0.0021	

6.5
0.00005
0.0027	

7.3
0.00005
0.0030	
Renin US LLC

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

0.008
NODI=B
NODI=B	

0.007
NODI=B
NODI=B	

0.026
NODI=B
NODI=B	

0.008
NODI=B
NODI=B	

0.009
NODI=B
NODI=B	

0.006
NODI=B
NODI=B	
Toyota Motor Manufacturing 

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

0.325
NODI=B
NODI=B	

0.319
NODI=B
NODI=B	

0.309
NODI=B
NODI=B	

0.327
NODI=B
NODI=B	

0.304
NODI=B
NODI=B	

0.322
NODI=B
NODI=B	
Sonoco Protective Solutions Inc

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

0.00798
---
---	

0.00880
---
---	

0.00853
---
---	

0.00671
---
---	

0.00643
---
---	

0.00720
---
---	
The Cooper Tire Company

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

0.133
---
---	

0.195
---
---	

0.195
---
---	

0.110
---
---	

0.105
---
---	

0.148
---
---	
T and L Specialty Company Inc

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

0.044
---
---	

0.048
---
---	

0.044
---
---	

0.044
---
---	

0.0524
---
---	

0.04
---
---	
Genlyte Thomas Group LLC

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

0.00166
NODI=B
NODI=B	

0.00194
NODI=B
NODI=B	

0.00170
NODI=B
NODI=B	

0.00190
NODI=B
NODI=B	

0.00193
NODI=B
NODI=B	

0.00174
NODI=B
NODI=B	
R K Metals LLC

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

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	
DOMESTIC FLOW, MGD:	6.75784	6.96456	6.1558	4.6556	6.17757	6.96276	
DOMESTIC LOAD, lb/day:	0.0066	0.0024	0.0021	0.0015	0.0021	0.0024	
DOMESTIC CONC., mg/L:	0.000117	0.00004	0.00004	0.00004	0.00004	0.00004	
DATA FOR CADMIUM (Cd) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Cadmium (Cd) = BGC = 0.00005 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.  
Date	May 2014	June 2014	July 2014	Sept. 2014	Oct. 2014	Nov. 2014	
Tupelo POTW

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

7.1
0.0115
0.68	

7.3
0.002
0.12	

6.5
0.003
0.16	

5.0
0.00275
0.11	

6.5
0.0025
0.14	

7.3
0.00248
0.15	
Renin US LLC

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

0.008
NODI=B
NODI=B	

0.007
NODI=B
NODI=B	

0.026
NODI=B
NODI=B	

0.008
NODI=B
NODI=B	

0.009
NODI=B
NODI=B	

0.006
NODI=B
NODI=B	
Toyota Motor Manufacturing 

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

0.325
NODI=B
NODI=B	

0.319
NODI=B
NODI=B	

0.309
NODI=B
NODI=B	

0.327
NODI=B
NODI=B	

0.304
NODI=B
NODI=B	

0.322
0.001
0.003	
Sonoco Protective Solutions Inc

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

0.00798
---
---	

0.00880
---
---	

0.00853
---
---	

0.00671
---
---	

0.00643
---
---	

0.00720
---
---	
The Cooper Tire Company

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

0.133
---
---	

0.195
---
---	

0.195
---
---	

0.110
---
---	

0.105
---
---	

0.148
---
---	
T and L Specialty Company Inc

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

0.044
---
---	

0.048
---
---	

0.044
---
---	

0.044
---
---	

0.0524
---
---	

0.04
---
---	
Genlyte Thomas Group LLC

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

0.00166
0.014
0.000157	

0.00194
0.018
0.00033	

0.00170
0.0075
0.000147	

0.00190
0.0025
0.00007	

0.00193
0.0155
0.000173	

0.00174
0.064
0.000844	
R K Metals LLC

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

0.0075
0.02
0.0012	

0.0075
0.02
0.0012	

0.0075
0.04
0.003	

0.0075
0.04
0.003	

0.0075
0.05
0.003	

0.0075
0.05
0.003	
DOMESTIC FLOW, MGD:	6.75784	6.96456	6.1558	4.6556	6.17757	6.96276	
DOMESTIC LOAD, lb/day:	0.678643	0.11847	0.156853	0.10693	0.136827	0.143156	
DOMESTIC CONC., mg/L:	0.0120	0.00204	0.00306	0.00275	0.00266	0.00248	
DATA FOR CHROMIUM (Cr) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Chromium (Cr) = BGC = 0.00417 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.  
Date	May 2014	June 2014	July 2014	Sept. 2014	Oct. 2014	Nov. 2014	
Tupelo POTW

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

7.1
0.02475
1.47	

7.3
0.00375
0.228	

6.5
0.013
0.705	

5.0
0.0225
0.938	

6.5
0.015
0.813	

7.3
0.008585
0.523	
Renin US LLC

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

0.008
0.01
0.0006	

0.007
NODI=B
NODI=B	

0.026
0.003
0.0006	

0.008
0.003
0.0002	

0.009
0.014
0.0008	

0.006
0.006
0.0005	
Toyota Motor Manufacturing 

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

0.325
0.012
0.033	

0.319
0.017
0.044	

0.309
0.019
0.048	

0.327
0.011
0.031	

0.304
0.008
0.021	

0.322
0.012
0.031	
Sonoco Protective Solutions Inc

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

0.00798
0.03
0.00218	

0.00880
0.023
0.00153	

0.00853
0.025
0.00175	

0.00671
0.022
0.001	

0.00643
0.033
0.00223	

0.00720
NODI=B
NODI=B	
The Cooper Tire Company

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

0.133
0.08
0.09	

0.195
0.05
0.08	

0.195
0.07
0.07	

0.110
0.07
0.06	

0.105
0.07
0.07	

0.148
0.08
0.1	
T and L Specialty Company Inc

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

0.044
0.108
0.00359	

0.048
0.134
0.00445	

0.044
0.134
0.00447	

0.044
0.102
0.00341	

0.0524
0.087
0.0029	

0.04
0.12
0.004	
Genlyte Thomas Group LLC

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

0.00166
0.0045
0.00002	

0.00194
NODI=B
NODI=B	

0.00170
NODI=B
NODI=B	

0.00190
NODI=B
NODI=B	

0.00193
NODI=B
NODI=B	

0.00174
0.004
0.000056	
R K Metals LLC

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

0.0075
0.02
0.0012	

0.0075
0.02
0.0012	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	
DOMESTIC FLOW, MGD:	6.57286	6.71276	5.90827	4.49489	6.01374	6.76756	
DOMESTIC LOAD, lb/day:	1.33941	0.09682	0.57958	0.84179	0.71547	0.386844	
DOMESTIC CONC., mg/L:	0.0244	0.00173	0.0118	0.0225	0.0143	0.00686	
DATA FOR COPPER (Cu) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Copper (Cu) = BGC = 0.0136 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.  
Date	May 2014	June 2014	July 2014	Sept. 2014	Oct. 2014	Nov. 2014	
Tupelo POTW

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

7.1
0.00208
0.123	

7.3
0.06256
3.81	

6.5
0.0011105
0.0602	

5.0
0.0010465
0.0436	

6.5
0.0008525
0.0462	

7.3
0.000976
0.0594	
Renin US LLC

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

0.008
NODI=B
NODI=B	

0.007
NODI=B
NODI=B	

0.026
NODI=B
NODI=B	

0.008
NODI=B
NODI=B	

0.009
0.011
0.0007	

0.006
0.005
0.0005	
Toyota Motor Manufacturing 

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

0.325
NODI=B
NODI=B	

0.319
NODI=B
NODI=B	

0.309
0.008
0.021	

0.327
NODI=B
NODI=B	

0.304
NODI=B
NODI=B	

0.322
NODI=B
NODI=B	
Sonoco Protective Solutions Inc

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

0.00798
---
---	

0.00880
---
---	

0.00853
---
---	

0.00671
---
---	

0.00643
---
---	

0.00720
---
---	
The Cooper Tire Company

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

0.133
---
---	

0.195
---
---	

0.195
---
---	

0.110
---
---	

0.105
---
---	

0.148
---
---	
T and L Specialty Company Inc

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

0.044
---
---	

0.048
---
---	

0.044
---
---	

0.044
---
---	

0.0524
---
---	

0.04
---
---	
Genlyte Thomas Group LLC

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

0.00166
NODI=B
NODI=B	

0.00194
NODI=B
NODI=B	

0.00170
NODI=B
NODI=B	

0.00190
NODI=B
NODI=B	

0.00193
NODI=B
NODI=B	

0.00174
NODI=B
NODI=B	
R K Metals LLC

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

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	
DOMESTIC FLOW, MGD:	6.75784	6.96456	6.1558	4.6556	6.17757	6.96276	
DOMESTIC LOAD, lb/day:	0.1199	3.8069	0.0361	0.0405	0.0424	0.0558	
DOMESTIC CONC., mg/L:	0.00213	0.0656	0.000703	0.00104	0.000823	0.000961	
DATA FOR LEAD (Pb) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Lead (Pb) = BGC = 0.0119 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.  
Date	May 2014	June 2014	July 2014	Sept. 2014	Oct. 2014	Nov. 2014	
Tupelo POTW

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

7.1
0.007
0.414	

7.3
0.0025
0.152	

6.5
0.0025
0.135	

5.0
0.00375
0.156	

6.5
0.0025
0.135	

7.3
0.004555
0.277	
Renin US LLC

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

0.008
NODI=B
NODI=B	

0.007
NODI=B
NODI=B	

0.026
NODI=B
NODI=B	

0.008
NODI=B
NODI=B	

0.009
NODI=B
NODI=B	

0.006
NODI=B
NODI=B	
Toyota Motor Manufacturing 

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

0.325
0.094
0.254	

0.319
0.091
0.242	

0.309
0.084
0.216	

0.327
0.082
0.224	

0.304
0.093
0.236	

0.322
0.103
0.277	
Sonoco Protective Solutions Inc

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

0.00798
---
---	

0.00880
---
---	

0.00853
---
---	

0.00671
---
---	

0.00643
---
---	

0.00720
---
---	
The Cooper Tire Company

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

0.133
---
---	

0.195
---
---	

0.195
---
---	

0.110
---
---	

0.105
---
---	

0.148
---
---	
T and L Specialty Company Inc

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

0.044
---
---	

0.048
---
---	

0.044
---
---	

0.044
---
---	

0.0524
---
---	

0.04
---
---	
Genlyte Thomas Group LLC

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

0.00166
0.003
0.000013	

0.00194
0.0025
0.000043	

0.00170
NODI=B
NODI=B	

0.00190
NODI=B
NODI=B	

0.00193
0.0105
0.000136	

0.00174
0.0315
0.000406	
R K Metals LLC

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

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	

0.0075
0.05
0.0031	
DOMESTIC FLOW, MGD:	6.75784	6.96456	6.1558	4.6556	6.17757	6.96276	
DOMESTIC LOAD, lb/day:	0.156887	Undefined 	Undefined	Undefined	Undefined	Undefined	
DOMESTIC CONC., mg/L:	0.00278	Undefined	Undefined	Undefined	Undefined	Undefined 	
DATA FOR NICKEL (Ni) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Nickel (Ni) = BGC = 0.00278 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.  
Date	May 2014	June 2014	July 2014	Sept. 2014	Oct. 2014	Nov. 2014	
Tupelo POTW

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

7.1
0.000461
0.0273	

7.3
0.000221
0.0135	

6.5
0.0002105
0.0114	

5.0
0.000304
0.0127	

6.5
0.000171
0.00927	

7.3
0.000124
0.00755	
Renin US LLC

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

0.008
0.013
0.0007	

0.007
0.033
0.0031	

0.026
0.045
0.01	

0.008
0.015
0.0011	

0.009
0.025
0.0015	

0.006
0.031
0.0026	
Toyota Motor Manufacturing 

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

0.325
NODI=B
NODI=B	

0.319
NODI=B
NODI=B	

0.309
NODI=B
NODI=B	

0.327
NODI=B
NODI=B	

0.304
NODI=B
NODI=B	

0.322
NODI=B
NODI=B	
Sonoco Protective Solutions Inc

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

0.00798
---
---	

0.00880
---
---	

0.00853
---
---	

0.00671
---
---	

0.00643
---
---	

0.00720
---
---	
The Cooper Tire Company

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

0.133
---
---	

0.195
---
---	

0.195
---
---	

0.110
---
---	

0.105
---
---	

0.148
---
---	
T and L Specialty Company Inc

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

0.044
---
---	

0.048
---
---	

0.044
---
---	

0.044
---
---	

0.0524
---
---	

0.04
---
---	
Genlyte Thomas Group LLC

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

0.00166
0.003
0.000013	

0.00194
NODI=B
NODI=B	

0.00170
NODI=B
NODI=B	

0.00190
NODI=B
NODI=B	

0.00193
NODI=B
NODI=B	

0.00174
NODI=B
NODI=B	
R K Metals LLC

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

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	

0.0075
0.01
0.0006	
DOMESTIC FLOW, MGD:	6.75784	6.96456	6.1558	4.6556	6.17757	6.96276	
DOMESTIC LOAD, lb/day:	0.025987	0.0098	0.0008	0.011	0.00717	0.00435	
DOMESTIC CONC., mg/L:	0.000461	0.000169	0.0000156	0.000283	0.000139	0.0000749	
DATA FOR SILVER (Ag) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Silver (Ag) = BGC = 0.000190 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.  
Date	May 2014	June 2014	July 2014	Sept. 2014	Oct. 2014	Nov. 2014	
Tupelo POTW

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

7.1
0.4195
24.8	

7.3
0.112
6.82	

6.5
0.2695
14.6	

5.0
0.1825
7.61	

6.5
0.087
4.72	

7.3
0.12735
7.75	
Renin US LLC

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

0.008
0.076
0.0046	

0.007
0.056
0.0052	

0.026
0.109
0.026	

0.008
0.051
0.0037	

0.009
0.171
0.012	

0.006
0.037
0.0026	
Toyota Motor Manufacturing 

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

0.325
0.067
0.181	

0.319
0.074
0.197	

0.309
0.081
0.208	

0.327
0.058
0.158	

0.304
0.06
0.153	

0.322
0.103
0.276	
Sonoco Protective Solutions Inc

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

0.00798
NODI=B
NODI=B	

0.00880
NODI=B
NODI=B	

0.00853
NODI=B
NODI=B	

0.00671
NODI=B
NODI=B	

0.00643
0.062
0.00419	

0.00720
NODI=B
NODI=B	
The Cooper Tire Company

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

0.133
0.22
0.24	

0.195
0.19
0.31	

0.195
0.42
0.46	

0.110
0.48
0.46	

0.105
0.6
0.6	

0.148
0.59
0.69	
T and L Specialty Company Inc

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

0.044
0.2
0.00666	

0.048
0.457
0.01525	

0.044
0.143
0.00478	

0.044
0.26
0.00867	

0.0524
0.079
0.00262	

0.04
0.06
0.00201	
Genlyte Thomas Group LLC

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

0.00166
0.0795
0.000611	

0.00194
0.0245
0.000444	

0.00170
0.017
0.000314	

0.00190
0.0695
0.001156	

0.00193
0.0065
0.000117	

0.00174
0.077
0.000787	
R K Metals LLC

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

0.0075
0.09
0.0058	

0.0075
0.09
0.0058	

0.0075
0.03
0.03	

0.0075
0.03
0.03	

0.0075
0.03
0.03	

0.0075
0.03
0.03	
DOMESTIC FLOW, MGD:	6.57286	6.71276	5.90827	4.49489	6.01374	6.76756	
DOMESTIC LOAD, lb/day:	24.361329	6.286306	13.870906	6.948474	3.918073	6.748603	
DOMESTIC CONC., mg/L:	0.445	0.112	0.282	0.185	0.0781	0.120	
DATA FOR ZINC (Zn) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Zinc (Zn) = BGC = 0.204 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.  
Date	May 2014	June 2014	July 2014	Sept. 2014	Oct. 2014	Nov. 2014	
Tupelo POTW

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

7.1
0.005
0.296	

7.3
0.005
0.304	

6.5
0.005
0.271	

5.0
0.0025
0.104	

6.5
0.0025
0.135	

7.3
0.0025
0.152	
Renin US LLC

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

0.008
NODI=B
NODI=B	

0.007
NODI=B
NODI=B	

0.026
NODI=B
NODI=B	

0.008
NODI=B
NODI=B	

0.009
NODI=B
NODI=B	

0.006
NODI=B
NODI=B	
Toyota Motor Manufacturing 

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

0.325
NODI=B
NODI=B	

0.319
NODI=B
NODI=B	

0.309
NODI=B
NODI=B	

0.327
NODI=B
NODI=B	

0.304
NODI=B
NODI=B	

0.322
NODI=B
NODI=B	
Sonoco Protective Solutions Inc

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

0.00798
---
---	

0.00880
---
---	

0.00853
---
---	

0.00671
---
---	

0.00643
---
---	

0.00720
---
---	
The Cooper Tire Company

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

0.133
---
---	

0.195
---
---	

0.195
---
---	

0.110
---
---	

0.105
---
---	

0.148
---
---	
T and L Specialty Company Inc

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

0.044
---
---	

0.048
---
---	

0.044
---
---	

0.044
---
---	

0.0524
---
---	

0.04
---
---	
Genlyte Thomas Group LLC

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

0.00166
NODI=B
NODI=B	

0.00194
NODI=B
NODI=B	

0.00170
NODI=B
NODI=B	

0.00190
NODI=B
NODI=B	

0.00193
NODI=B
NODI=B	

0.00174
NODI=B
NODI=B	
R K Metals LLC

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

0.0075
0.02
0.0012	

0.0075
0.02
0.0012	

0.0075
0.002
0.0012	

0.0075
0.002
0.0012	

0.0075
0.002
0.0012	

0.0075
0.002
0.0012	
DOMESTIC FLOW, MGD:	6.75784	6.96456	6.1558	4.6556	6.17757	6.96276	
DOMESTIC LOAD, lb/day:	0.2948	0.3028	0.2698	0.1028	0.1338	0.1508	
DOMESTIC CONC., mg/L:	0.005	0.005	0.005	0.0026	0.0026	0.0026	
DATA FOR CYANIDE (CN) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Cyanide (CN) = BGC = 0.0038 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

Tupelo POTW
[mg/L]	5/7/14	5/15/14	6/12/14	6/19/14	7/17/14	7/31/14	9/11/14	9/18/14	10/9/14	10/16/14	11/6/14	11/13/14	Removal Efficiency1	
Cd Inf.	0.00005	0.000192	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	63%*	
Cd Eff.	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005	0.00005		
Cr Inf.	0.009	0.014	0.003	0.001	0.004	0.002	0.003	0.0025	0.0025	0.0025	0.00178	0.00318	82.5%	
Cr Eff.	0.001	0.001	0.001	0.001	0.001	0.001	0.001	0.0025	0.0025	0.0025	0.0005	0.0005		
Cu Inf.	0.0025	0.047	0.0025	0.005	0.008	0.018	0.015	0.030	0.018	0.012	0.00738	0.00979	87.0%	
Cu Eff.	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.00105	0.00101		
Pb Inf.	0.00161	0.00255	0.1.24	0.00112	0.000751	0.00147	0.000863	0.00123	0.000771	0.000934	0.00127	0.000682	79.3%	
Pb Eff.	0.000250	0..000250	0.000250	0.000250	0.000250	0.000250	0.000250	0.000250	0.000250	0.000250	0.000250	0.000250		
Ni Inf.	0.005	0.009	0.0025	0.0025	0.0025	0.0025	0.0025	0.005	0.0025	0.0025	0.00390	0.00521	58.6%	
Ni Eff.	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.00228	0.00187		
Ag Inf.	0.000242	0.000680	0.000187	0.000255	0.000140	0.000281	0.000389	0.000219	0.000138	0.000204	0.000142	0.000106	79.9%	
Ag Eff.	0.000050	0.000050	0.000050	0.000050	0.000050	0.000050	0.000050	0.000050	0.000050	0.000050	0.000050	0.000050		
Zn Inf.	0.340	0.499	0.099	0.125	0.386	0.153	0.208	0.157	0.098	0.076	0.0977	0.157	74.5%	
Zn Eff.	0.060	0.048	0.028	0.042	0.058	0.057	0.069	0.070	0.054	0.023	0.0517	0.0499		
CN Inf.	No data	0.005	0.005	0.005	0.005	0.005	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	62%*	
CN Eff.	No data	0.005	0.005	0.005	0.005	0.005	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025		

Yellow-shaded values were excluded because the inf. = eff. for the same sample date.  

Blue values were used in “non-detect” results obtained from the POTW bench sheets where the MQL (Method Quantitation Limit) was then divided by 2 to obtain the blue value.  

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

*Due to inadequate data from the actual POTW, MDEQ-observed removal efficiencies were used.