PRETREATMENT RATIONALE FOR RENEWAL – SECOND DRAFT  

Waste Management of Mississippi Inc,          Prairie Bluff Landfill and Recycling Center
Chickasaw County  
Houston, Mississippi  
Water II Branch		
Agency Interest (AI) No.: 791  
Permit No.: MSP090940
SIC Code: 4953
July 9, 2018  
Permit Writer: Carter Cress 

I.	        FACILITY INFORMATION

A.	Nature of Business: Municipal solid waste landfill.   

B.	Process Wastewater Description: Consists of landfill leachate and wash water from equipment washing operations.  

C.	Proposed Flowrates: 	
Outfall No.	POTW Name	Flowrate	
001	Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant  	Monthly Maximum: Report    	
002	Greenwood POTW    	Monthly Maximum: Report    	

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

II.	RECEIVING POTW INFORMATION

A.	POTW Names, AI Nos., and Permit Nos.:
POTW Name	AI No.	Permit No.	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant  	13088	MS0056472  	
Greenwood POTW    	13155	MS0023833  	

B.	POTW Treatment Types: 
POTW Name	Treatment Type(s)  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant  	Activated sludge system followed by chlorine disinfection.       	
Greenwood POTW  	Facility currently has a trickling filter system followed by chlorine disinfection.  Facility is in the process of converting to an activated sludge system followed by chlorine disinfection.   	

C.	POTW Design Flowrates: 
POTW Name	Design Flowrate	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant  	10 MGD  	
Greenwood POTW  	6.32 MGD   	

D.	POTW Receiving Streams: 
POTW Name	Receiving Stream   	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant  	Luxapalila Creek  	
Greenwood POTW    	Yazoo River  	

E.	POTW Receiving Streams’ 7Q10 (Q7/10): 
POTW Name	7Q10 ( Q7/10)  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant  	59 cfs = 38 MGD  	
Greenwood POTW    	1,050 cfs = 678.6 MGD  	

OUTFALL 001: COLUMBUS, CITY OF, REYNOLDS R RIDGLEY WASTEWATER TREATMENT PLANT  

III.	PERTINENT FLOWRATE AND LOADING DATA

A.	POTW 12-month Average Flowrate (QPOTW): 3.2 MGD.  

POTW Monthly Average flowrate values using 12 months of recently-available DMR data (MGD): 
08/16	09/16	10/16	11/16	12/16	01/17	02/17	03/17	04/17	05/17	06/17	07/17	
0.98	1.84	2.45	3.18	3.37	4.2	4.82	3.2	2.61	4.6	5.95	0.6	

B.	Industrial Facilities Flowrates Data:

Facility 
(Permit No., AI No.)	Permitted Flow 
(Monthly Max.)  	Reported Monthly Max. (Qw)* 	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
(MSP090940, 791)  	0.0111 MGD**	0.0111 MGD** 	
Greenfield Environmental Multistate Trust LLC  
(MSP090021, 1696)  	0.110 MGD   	0.047535 MGD  	
TVA Caledonia Combined Cycle Plant
(MSP091762, 12322)  	1.9 MGD***	0.939 MGD1  	
Valmet
(MSP090655, 1302)  	0.12 MGD***	0.02 MGD1	
Total	2.1411 MGD	1.017635 MGD  	

*The largest Monthly Max. value in the DMRs from August 2016 – July 2017.  

**This facility has to Report its Monthly Max.; this value is the largest Monthly Max. in the DMRs from August 2016 – July 2017.  

***This facility has a permitted limit for Monthly Avg. rather than Monthly Max.; this value is the permitted Monthly Avg.  

1 This is the largest Monthly Avg. value in the DMRs from August 2016 – July 2017.       

C.	Current Maximum Permitted Loads (Xta):
Parameter	Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
(lb/day) 
	Greenfield Environmental Multistate Trust LLC  
(lb/day)	TVA Caledonia Combined Cycle Plant  
(lb/day)  	Valmet 
(lb/day)	Xtat
(lb/day)  	
Ammonia Nitrogen	Report	---	---	6****	6	
BOD5   	Report	---	---	Report	0	
Oil and Grease	Report	54*	---	100	154	
Total Suspended Solids	Report	---	---	Report	0	
pH	6.0 – 9.0 SU  	6.0 – 9.0 SU	6.5 – 9.5 SU	6.5 – 9.5 SU	---	
Zinc (Zn)	Report	---	18**	---	18	
Cadmium (Cd)	---	---	---	---	0	
Chromium (Cr)	---	1.28	3.6***	---	4.88	
Copper (Cu)	---	0.97	---	---	0.97	
Lead (Pb)	---	---	---	---	0	
Nickel (Ni)	---	---	---	---	0	
Silver (Ag)	---	---	---	---	0	
Cyanide (CN)	---	---	---	---	0	

*This facility has a permit limit of 59 mg/L Monthly Max. for this pollutant.  Therefore, this value was calculated by utilizing this limit and the permitted Monthly Max. flowrate of 0.110 MGD.  

**This facility has a permit limit of 0.18 mg/L Daily Max. for this pollutant.  Therefore, this value was calculated by utilizing this limit and the permitted Daily Max. flowrate of 2.4 MGD.  

***This facility has a permit limit of 0.91 mg/L Daily Max. for this pollutant.  Therefore, this value was calculated by utilizing this limit and the permitted Daily Max. flowrate of 2.4 MGD.  

**** This facility has a permit limit of 6 mg/L Quarterly Avg. for this pollutant.  Therefore, this value was calculated by utilizing this limit and the permitted Monthly Avg. flowrate of 0.12 MGD.  

D.	Maximum Monthly Average Discharge Values (Xt) using 12 months of recently-available DMR data (August 2016 – July 2017):
Parameter	Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
(lb/day) 
	Greenfield Environmental Multistate Trust LLC  
(lb/day)	TVA Caledonia Combined Cycle Plant  
(lb/day)  	Valmet
(lb/day)	Xtt
(lb/day)  	
Ammonia Nitrogen	57.02	---	---	0.036	57.056	
BOD5   	33.39	---	---	0.8****	34.19	
Oil and Grease	0.258	2.3*	---	5	7.558	
Total Suspended Solids	4.2	---	---	0.61	4.8	
pH	Min.: 7.4 SU;
Max.: 7.7 SU 	Min.: 6.2 SU;
Max.: 8.3 SU	Min.: 7.2 SU;
Max.: 8.9 SU	Min.: 7 SU;
Max.: 8.9 SU	---	
Zinc (Zn)	0.007  	---	1.15	---	1.157	
Cadmium (Cd)	---	---	---	---	0	
Chromium (Cr)	---	0.00011**	0.02	---	0.02011	
Copper (Cu)	---	0.00045***	---	---	0.00045	
Lead (Pb)	---	---	---	---	0	
Nickel (Ni)	---	---	---	---	0	
Silver (Ag)	---	---	---	---	0	
Cyanide (CN)	---	---	---	---	0	

*The Maximum Monthly Avg. in the DMRs was 7.2 mg/L.  Utilizing the corresponding Monthly Max. flowrate of 0.039 MGD, this load value was calculated.  

**This is the Maximum Annual Max. value in the DMRs.  

***This is the Maximum Annual Avg. value in the DMRs.  

****The Maximum Quarterly Avg. in the DMRs was 9.6 mg/L.  Utilizing the corresponding Monthly Avg. flowrate of 0.01 MGD, this load value was calculated.  

1 The Maximum Quarterly Avg. in the DMRs was 23 mg/L.  Utilizing the corresponding Monthly Avg. flowrate of 0.003 MGD, this load value was calculated.  

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.1 or literature values from Appendix V of EPA’s Local Limits Development Guidance (EPA 833-R-04-002A, July 2004) for those pollutants with insufficient data.  

QINDUSTRIAL = QW1 + QW2 + …
where QW is the largest average flowrate from the DMRs over a recent twelve month period.  (Maximum flowrate data may be used when monthly average data is not available.)  NOTE: since no industrial facilities permitted to discharge into the POTW have current limits for metals (other than Cr, Cu, and Zn), QINDUSTRIAL = 0.  

BGL (Cd) = 8.34*0.000695*(3.2 – 0) = 			0.019 lb/day
BGL (Cr) = 8.34*0.0014*(3.2 – 0.986535) = 		0.026 lb/day
BGL (Cu) = 8.34*0.021*(3.2 – 0.047535) = 			0.55 lb/day
BGL (Pb) = 8.34*0.00318*(3.2 – 0) = 			0.085 lb/day
BGL (Ni) = 8.34*0.00828*(3.2 – 0) = 			0.22 lb/day
BGL (Ag) = 8.34*0.000292*(3.2 – 0) = 			0.0078 lb/day
BGL (Zn) = 8.34*0.112*(3.2 – 0.9501) = 			2.1 lb/day
BGL (CN) = 8.34*0.0025*(3.2 – 0) = 			0.067 lb/day
	
V.	WATER QUALITY ANALYSIS

A.	Instream Wastewater Concentration

IWC, % = [QPOTW / (QPOTW + Q7/10)] x 100 = [3.2/(3.2 + 38)]*100 = 7.7 %

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, from actual POTW data (Appendix B.1) or from MDEQ-observed study data for those pollutants with insufficient data.  

ACUTE SCREENING:  

AWQC (Cd) = 8.34*0.00103*(38 + 3.2)/(1 – 0.897) = 	3.4 lb/day
AWQC (Cr) = 8.34*0.323*(38 + 3.2)/(1 – 0.626) = 		300 lb/day
AWQC (Cu) = 8.34*0.0070*(38 + 3.2)/(1 – 0.856) = 	17 lb/day
AWQC (Pb) = 8.34*0.030*(38 + 3.2)/(1 – 0.921) = 		130 lb/day
AWQC (Ni) = 8.34*0.260*(38 + 3.2)/(1 – 0.504) = 		180 lb/day
AWQC (Ag) = 8.34*0.00098*(38 + 3.2)/(1 – 0.866) = 	2.5 lb/day
AWQC (Zn) = 8.34*0.065*(38 + 3.2)/(1 – 0.721) = 		80 lb/day
AWQC (CN) = 8.34*0.0220*(38 + 3.2)/(1 – 0.62) = 	20 lb/day

CHRONIC SCREENING:  

AWQC (Cd) = 8.34*0.00015*(38 + 3.2)/(1 – 0.897) = 	0.50 lb/day
AWQC (Cr) = 8.34*0.042*(38 + 3.2)/(1 – 0.626) = 		39 lb/day
AWQC (Cu) = 8.34*0.0050*(38 + 3.2)/(1 – 0.856) = 	12 lb/day
AWQC (Pb) = 8.34*0.00118*(38 + 3.2)/(1 – 0.921) = 	5.1 lb/day
AWQC (Ni) = 8.34*0.029*(38 + 3.2)/(1 – 0.504) = 		20 lb/day
AWQC (Ag) = 8.34*NA*(38 + 3.2)/(1 – 0.866) = 		NA
AWQC (Zn) = 8.34*0.065*(38 + -3.2)/(1 – 0.721) = 	80 lb/day
AWQC (CN) = 8.34*0.0052*(38 + 3.2)/(1 – 0.62) = 	4.7 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*3.2*1.0 = 		27 lb/day
	HWI (Cr) = 8.34*3.2*1.0 = 		27 lb/day
	HWI (Cu) = 8.34*3.2*1.0 = 		27 lb/day
	HWI (Pb) = 8.34*3.2*1.0 = 		27 lb/day
	HWI (Ni) = 8.34*3.2*1.0 = 		27 lb/day
	HWI (Ag) = 8.34*3.2*0.25 = 	6.7 lb/day
	HWI (Zn) = 8.34*3.2*1.0 = 		27 lb/day
	HWI (CN) = 8.34*3.2*1.0 = 		27 lb/day

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

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

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	QI	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center	0.0111	
TVA Caledonia Combined Cycle Plant	1.9	
Total	1.9111	

ACUTE:

PAI (Zn) = (27 – 2.1)*(0.0111/1.9111) = 		0.14 lb/day
CALLOW (Zn) = 0.14/(8.34*0.0111) = 			1.5 mg/L

CHRONIC:  

PAI (Zn) = (27 – 2.1)*(0.0111/1.9111) = 		0.14 lb/day
CALLOW (Zn) = 0.14/(8.34*0.0111) = 			1.5 mg/L

OUTFALL 002: GREENWOOD POTW  

VIII.	    PERTINENT FLOWRATE AND LOADING DATA

E.	POTW 12-month Average Flowrate (QPOTW): 3.32 MGD.  

POTW Monthly Average flowrate values using 12 months of recently-available DMR data (MGD): 
08/16	09/16	10/16	11/16	12/16	01/17	02/17	03/17	04/17	05/17	06/17	07/17	
3.151	2.597	2.637	2.832	3.488	4.036	3.426	3.964	4.03	3.446	3.235	3.012	

F.	Industrial Facilities Flowrates Data:

Facility 
(Permit No., AI No.)	Permitted Flow 
(Monthly Avg.)  	Reported Monthly Avg. (Qw)* 	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
(MSP090940, 791)  	0.0111 MGD**	0.0111 MGD**  	
Viking Range Corporation, Cooking Plant, East Site
(MSP091295, 1016)  	0.025 MGD	0.0216 MGD   	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill
(MSP091115, 1542)  	0.025 MGD***	0.02497 MGD  	
Viking Range Corporation, Highway 82 West Site
(MSP091397, 11226) 	0.0015 MGD1	0.0015 MGD1	
Total	0.0626 MGD  	0.05917 MGD  	

*The largest Monthly Avg. value in the DMRs from August 2016 – July 2017.  

**This facility has to Report its Monthly Max.; this value is the largest Monthly Max. in the DMRs from August 2016 – July 2017.  

***This facility’s only permitted flowrate limit is a Maximum of 0.025 MGD.  

1 This facility has to Report its Monthly Avg.  Therefore, this is the largest Monthly Avg. value in the DMRs from August 2016 – July 2017.       

G.	Current Maximum Permitted Loads (Xta):

Parameter	Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
(lb/day) 
	Viking Range Corporation, Cooking Plant, East Site  
(lb/day)	Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill (lb/day)  	Viking Range Corporation, Highway 82 West Site
(lb/day)  
	Xtat
(lb/day)  	
Ammonia Nitrogen	Report	---	Report	---	0	
BOD5   	Report	---	1564	---	1564	
Oil and Grease	Report	---	31.3	---	31.3	
Total Suspended Solids	Report	---	521	---	521	
pH	6.0 – 9.0 SU  	5.5 – 9.5 SU	6.0 – 9.0 SU	5.5 – 9.5 SU	---	
Zinc (Zn)	Report	0.544	5.1*	0.22	5.864	
Cadmium (Cd)	---	0.023	---	0.0092	0.0322	
Chromium (Cr)	---	0.578	5.7**	0.23	6.508	
Copper (Cu)	---	0.705	5.5***	0.28	6.485	
Lead (Pb)	---	0.144	5.7**	0.058	5.902	
Nickel (Ni)	---	0.83	5.6****	0.33	6.76	
Silver (Ag)	---	0.09	---	0.036	0.126	
Cyanide (CN)	---	0.25	---	0.10	0.35	

*This facility has a permit limit of 24.3 mg/L Monthly Max. for this pollutant.  Therefore, this value was calculated by utilizing this limit and the permitted Maximum. flowrate of 0.025 MGD.  

**This facility has a permit limit of 27.5 mg/L Monthly Max. for this pollutant.  Therefore, this value was calculated by utilizing this limit and the permitted Maximum. flowrate of 0.025 MGD.  

***This facility has a permit limit of 26.6 mg/L Monthly Max. for this pollutant.  Therefore, this value was calculated by utilizing this limit and the permitted Maximum. flowrate of 0.025 MGD.  

****This facility has a permit limit of 27.1 mg/L Monthly Max. for this pollutant.  Therefore, this value was calculated by utilizing this limit and the permitted Maximum. flowrate of 0.025 MGD.  

H.	Maximum Monthly Avg. Discharge Values (Xt) using 12 months of recently-available DMR data (August 2016 – July 2017):

Parameter	Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
(lb/day) 
	Viking Range Corporation, Cooking Plant, East Site  
(lb/day)	Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill (lb/day)  	Viking Range Corporation, Highway 82 West Site
(lb/day)  
	Xtt
(lb/day)  	
Ammonia Nitrogen	57.02	---	95.1	---	152.12	
BOD5   	33.39	---	18.8	---	52.19	
Oil and Grease	0.258	---	0.98	---	1.238	
Total Suspended Solids	4.2	---	12.82	---	17.02	
pH	Min.: 7.4 SU;
Max.: 7.7 SU	Min.: 6.34 SU;
Max.: 8.6 SU	Min.: 6.49 SU;
Max.: 8.69 SU  	Min.: 5 SU;
Max.: 8.37 SU  	---	
Zinc (Zn)	0.007	0.007	0.012	0.0243	0.0503	
Cadmium (Cd)	---	NODI=B1	---	0.000008	0.000008	
Chromium (Cr)	---	0.06	0.0148	0.006433	0.081233	
Copper (Cu)	---	0.0436	0.0013	0.005777	0.050677	
Lead (Pb)	---	NODI=B	NODI=B	0.00008	0.00008	
Nickel (Ni)	---	0.028	0.03	0.0017	0.0597	
Silver (Ag)	---	NODI=B	---	NODI=B	0	
Cyanide (CN)	---	0.0038	---	NODI=B	0.0038	
	
	1 NODI=B is an EPA indicator code that means “below detect limit/no detect.”  

IX.	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.2 or literature values from Appendix V of EPA’s Local Limits Development Guidance (EPA 833-R-04-002A, July 2004) for those pollutants with insufficient data.  

QINDUSTRIAL = QW1 + QW2 + …
where QW is the largest average flowrate from the DMRs over a recent twelve month period.  (Maximum flowrate data may be used when monthly average data is not available.)  
BGL (Cd) = 8.34*0.00011*(3.32 – 0.0231) = 			0.0030 lb/day
BGL (Cr) = 8.34*0.0025*(3.32 – 0.04807) = 			0.068 lb/day
BGL (Cu) = 8.34*0.024*(3.32 – 0.04807) = 				0.65 lb/day
BGL (Pb) = 8.34*0.0046*(3.32 – 0.04807) = 			0.13 lb/day
BGL (Ni) = 8.34*0.018*(3.32 – 0.04807) = 				0.49 lb/day
BGL (Ag) = 8.34*0.00018*(3.32 – 0.0231) = 			0.0049 lb/day
BGL (Zn) = 8.34*0.11*(3.32 – 0.05917) = 				3.0 lb/day
BGL (CN) = 8.34*0.005*(3.32 – 0.0231) = 				0.14 lb/day

X.	WATER QUALITY ANALYSIS

I.	Instream Wastewater Concentration

IWC, % = [QPOTW / (QPOTW + Q7/10)] x 100 = [3.32/(3.32 + 678.6)]*100 = 0.487 %

Since IWC < 1%, only acute screening is developed.    

J.	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, from actual POTW data (Appendix B.2) or from MDEQ-observed study data for those pollutants with insufficient data.  

ACUTE SCREENING:  

AWQC (Cd) = 8.34*0.00103*(678.6 + 3.32)/(1 – 0.10) = 		6.51 lb/day
AWQC (Cr) = 8.34*0.323*(678.6 + 3.32)/(1 – 0.55) = 		4080 lb/day
AWQC (Cu) = 8.34*0.0070*(678.6 + 3.32)/(1 – 0.410) = 		67.5 lb/day
AWQC (Pb) = 8.34*0.030*(678.6 + 3.32)/(1 – 0.707) = 		582 lb/day
AWQC (Ni) = 8.34*0.260*(678.6 + 3.32)/(1 – 0.833) = 		8850 lb/day
AWQC (Ag) = 8.34*0.00098*(678.6 + 3.32)/(1 – 0.62) = 		14.7 lb/day
AWQC (Zn) = 8.34*0.065*(678.6 + 3.32)/(1 – 0.619) = 		970 lb/day
AWQC (CN) = 8.34*0.0220*(678.6 + 3.32)/(1 – 0.59) = 		305 lb/day

 

XI.	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*3.32*1.0 = 		27.7 lb/day
	HWI (Cr) = 8.34*3.32*1.0 = 		27.7 lb/day
	HWI (Cu) = 8.34*3.32*1.0 = 		27.7 lb/day
	HWI (Pb) = 8.34*3.32*1.0 = 		27.7 lb/day
	HWI (Ni) = 8.34*3.32*1.0 = 		27.7 lb/day
	HWI (Ag) = 8.34*3.32*0.25 = 	6.92 lb/day
	HWI (Zn) = 8.34*3.32*1.0 = 		27.7 lb/day
	HWI (CN) = 8.34*3.32*1.0 = 	27.7 lb/day

XII.	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)

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	QI	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center	0.0111	
Viking Range Corporation, Cooking Plant, East Site	0.025	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill	0.025	
Viking Range Corporation, Highway 82 West Site	0.0015	
Total	0.0626	

ACUTE:

PAI (Zn) = (27.7 – 3.0)*(0.0111/0.0626) = 			4.38 lb/day
CALLOW (Zn) = 4.38/(8.34*0.0111) = 				47.3 mg/L

XIII.	LIMITING CASE (LC) SUMMARY TABLE – OUTFALL 001: COLUMBUS, CITY OF, REYNOLDS R RIDGLEY WASTEWATER TREATMENT PLANT                                                                                            

	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)	
Cd	27	3.4	0.50	3.4	0.50	0.019	0	0	PASS	PASS	PASS	
Cr	27	300	39	27	27	0.026	4.88	.02011	PASS	PASS	PASS	
Cu	27	17	12	17	12	0.55	0.97	.00045	PASS	PASS	PASS	
Pb	27	130	5.1	27	5.1	0.085	0	0	PASS	PASS	PASS	
Ni	27	180	20	27	20	0.22	0	0	PASS	PASS	PASS	
Ag	6.7	2.5	NA	2.5	NA	0.0078	0	0	PASS	PASS	PASS	
Zn	27	80	80	27	27	2.1	18	1.157	PASS	PASS	PASS	
CN	27	20	4.7	20	4.7	0.067	0	0	PASS	PASS	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.  

LIMITING CASE (LC) SUMMARY TABLE – OUTFALL 002: GREENWOOD POTW  

	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)	
Cd	27.7	6.51	---	6.51	---	0.0030	0.0322	.000008	PASS	PASS	PASS	
Cr	27.7	4080	---	27.7	---	0.068	6.508	.081233	PASS	PASS	PASS	
Cu	27.7	67.5	---	27.7	---	0.65	6.485	.050677	PASS	PASS	PASS	
Pb	27.7	582	---	27.7	---	0.13	5.902	.00008	PASS	PASS	PASS	
Ni	27.7	8850	---	27.7	---	0.49	6.76	0.0597	PASS	PASS	PASS	
Ag	6.92	14.7	---	6.92	---	0.0049	0.126	0	PASS	PASS	PASS	
Zn	27.7	970	---	27.7	---	3.0	5.864	0.0503	PASS	PASS	PASS	
CN	27.7	305	---	27.7	---	0.14	0.35	0.0038	PASS	PASS	PASS	

*If AWQC < HWI, then LC = AWQC; if AWQC > HWI, then LC = HWI. 
XIV.	
PROPOSED PERMIT LIMTATIONS – OUTFALL 001: COLUMBUS, CITY OF, REYNOLDS R 
Parameter	
Allowable Loads and Concentrations

	Current Permit Limits	Proposed Permit Limits	Sampling Frequency 	Sample Type	Basis of Decision1	
	Acute
(lb/day)
	Chronic
(lb/day)
	Acute
(mg/L)
	Chronic
(mg/L)
	Max (lb/day)	Avg. (lb/day)	Max. (lb/day)	Avg. 
(lb/day)				
Ammonia Nitrogen	---	---	---	---	Report	Report	Report	Report	Twice per Month	Grab	CPL	
BOD5	---	---	---	---	Report	Report	Report	Report	Twice per Month	Grab	CPL	
Oil and Grease	---	---	---	---	Report	Report	Report	Report	Twice per Month 	Grab	CPL	
Total Suspended Solids	---	---	---	---	Report	Report	Report	Report	Twice per Month	Grab	CPL	
Zinc (Zn)	0.14	0.14	1.5	1.5	Report	Report	Report 	Report	Twice per Month 	Grab	CPL	
             RIDGLEY WASTEWATER TREATMENT PLANT                                                                                            

Parameter	Current Permit Limits	Proposed Permit Limits	Current Sampling Frequency	Proposed Sampling Frequency  	Sample Type	Basis of Decision1	
pH	6.0 – 9.0 SU	6.0 – 9.0 SU	Weekly 	Twice per Month  	Grab 	BJ  	

Parameter	Current Permit Limits	Proposed Permit Limits	Sampling Frequency	Sample Type	Basis of Decision1	
Flow	Report Monthly Max.  	Report Monthly Max.	Upon each Occurrence  	Batch  	CPL	

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

PROPOSED PERMIT LIMTATIONS – OUTFALL 002: GREENWOOD POTW  
Parameter	
Allowable Loads and Concentrations

	Current Permit Limits	Proposed Permit Limits	Sampling Frequency 	Sample Type	Basis of Decision1	
	Acute
(lb/day)
	Chronic
(lb/day)
	Acute
(mg/L)
	Chronic
(mg/L)
	Max (lb/day)	Avg. (lb/day)	Max. (lb/day)	Avg. 
(lb/day)				
Ammonia Nitrogen	---	---	---	---	---	---	Report	Report	Twice per Month	Grab	BJ	
BOD5	---	---	---	---	---	---	Report	Report	Twice per Month	Grab	BJ	
Oil and Grease	---	---	---	---	---	---	Report	Report	Twice per Month 	Grab	BJ	
Total Suspended Solids	---	---	---	---	---	---	Report	Report	Twice per Month	Grab	BJ	
Zinc (Zn)	4.38	---	47.3	---	---	---	Report 	Report	Twice per Month 	Grab	BJ	

Parameter	Current Permit Limits	Proposed Permit Limits	Proposed Sampling Frequency	Sample Type	Basis of Decision1	
pH	---	6.0 – 9.0 SU	Twice per Month	Grab	BJ  	
	
Parameter	Current Permit Limits	Proposed Permit Limits	Proposed Sampling Frequency	Sample Type	Basis of Decision1  	
Flow	---	Report Monthly Max.	Upon each Occurrence	Batch	BJ  	
						
1 Basis of Decision: BJ = Best Judgment.  

XV.	STATEMENT OF BASIS (narrative)

The facility requested in a supplemental letter received by MDEQ on September 14, 2017 to amend the submitted permit renewal application to include an additional POTW as a potential destination for its process wastewater.  This additional POTW is the Greenwood POTW and is identified as “Outfall 002” within this document and the draft permit.  The currently-active permitted discharge POTW is Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant, which is identified as “Outfall 001.”    
Pages 9 – 14, 16, and the “Adequacy of Treatment” at the end of this document display the mathematical calculations used to evaluate whether the Greenwood POTW is a suitable discharge point for the facility’s process wastewater in regard to eight metallic pollutants, hydraulic loading, and organic loading.  The results of these analyses are displayed in the table on page 16 and in the Adequacy of Treatment.  No potential conflicts were revealed if the facility was authorized to discharge its process wastewater to the Greenwood POTW in regard to the eight metallic pollutants, hydraulic loading, and organic loading.  
Written authorization to allow the facility to discharge its process wastewater into the Greenwood POTW was requested.  An e-mail was received on October 5, 2017 from Mr. Eddie Curry of the Greenwood POTW granting permission for this discharge.  A copy of this e-mail is in the file.    
The following custom requirement has been added to the proposed permit:
“A copy of each Discharge Monitoring Report (DMR) form pertaining to Outfall 002 shall also be submitted monthly by the 28th of the subsequent month to the POTW at the following address:

Mr. Eddie Curry
Greenwood POTW
PO Box 907
Greenwood, MS  38930”  [11 Miss. Admin. Code Pt. 6, Ch. 1, Subch. 1.]    
UPDATED JULY 9, 2018: The currently-active permit limits for process wastewater discharged to Outfall 001 will remain the same except for a change to the sampling frequency for pH.  In a letter received by MDEQ on June 11, 2018, the facility requested reducing the sampling frequency from weekly to twice per month.  The letter states that this alteration will simplify the logistics associated with scheduling sample collection and analytical tasks.  In addition, the facility can demonstrate historical consistent compliance in regard to the pH parameter.  MDEQ has deemed this justification acceptable and the sampling frequency for pH has been reduced for both Outfall 001 and Outfall 002.  The proposed limits for discharge to Outfall 002 will be the same as the proposed limits for Outfall 001.  Both POTWs are similar in regard to treatment type, the type of industrial facilities contributing to their flow, and QPOTW.    
The letter also requested removal of condition S-8 from the proposed permit.  Condition S-8 is displayed below:
“The following parameters shall be analyzed and reported on a Quarterly basis according to the EPA method listed: 

Parameter Method 

Antimony 204.2 
Arsenic 206.2 
Beryllium 210.3 
Cadmium 213.2 
Chromium (total) 218.2 
Chromium (+6) 200.7 
Copper 220.2 
Lead 239.2 
Mercury 245.1 
Nickel (freshwater) 200.7 
Selenium 270.3 
Silver 272.2 
Thallium 279.2 
Zinc 289.2 
Cyanide 335.2 

This sampling is to be performed on the process waste water even if there is no flow to either Outfall 001 or Outfall 002.  This permit shall be modified, or alternately, revoked and reissued if new data and/or information reveals that the average concentration of any listed priority metal exceeds twenty-five percent of the detectable limit established by the EPA test method indicated by this permit over a one-year time period.” [40 CFR 136.3]  

To justify removal of this condition, the facility can provide ample historical analytical testing data originating from the fulfillment of this condition.  Based on this historical data and no expectation that the characteristics of the permitted leachate wastewater will significantly change over any short period of time, the facility believes it is an antiquated condition and no longer necessary.  MDEQ has deemed this justification acceptable and condition S-8 has been removed from the proposed permit.  

APPENDIX A.1

OUTFALL 001: COLUMBUS, CITY OF, REYNOLDS R RIDGLEY WASTEWATER TREATMENT PLANT  

BACKGROUND CONCENTRATION OF DOMESTIC SEWAGE*

Cadmium (Cd):		BGC = 	0.000695 mg/L
Chromium (Cr):		BGC =	0.0014 mg/L
Copper (Cu):		BGC =	0.021 mg/L
Lead (Pb):			BGC = 	0.00318 mg/L
Nickel (Ni):			BGC = 	0.00828 mg/L
Silver (Ag):			BGC =	0.000292 mg/L
Zinc (Zn):			BGC = 	0.112 mg/L
Cyanide (CN)		BGC =	0.0025 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.

	December 2014	January 
2015	February 
2015	March
2015	April 
2015	May 
2015  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

3.01
0.002265
0.0568	

6.95
No data
No data	

2.11
0.0003415
0.00601	

5.13
0.000376
0.0161	

4.69
0.0003285
0.0128	

2.15
0.000164
0.00294	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	
Greenfield Environmental Multistate Trust LLC  
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.037
Not permitted
Not permitted	

0.039
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	

0.0346
Not permitted
Not permitted	

0.03
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	
TVA Caledonia Combined Cycle Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day: 	

0.514
Not permitted
Not permitted	

0.773
Not permitted
Not permitted	

0.842
Not permitted
Not permitted	

0.586
Not permitted
Not permitted	

0.62
Not permitted
Not permitted	

0.706
Not permitted
Not permitted	
DOMESTIC FLOW, MGD:	3.01	6.95	2.11	5.13	4.69	2.15	
DOMESTIC LOAD, lb/day:	0.0568	No data	0.00601	0.0161	0.0128	0.00294	
DOMESTIC CONC., mg/L:	0.002265	No data	0.0003415	0.000376	0.0003285	0.000164	
DATA FOR CADMIUM (Cd) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Cadmium (Cd) = BGC = 0.000695 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  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

3.01
0.00376
0.0944	

6.95
0.00105
0.0608	

2.11
0.00095
0.0167	

5.13
0.00091
0.0389	

4.69
0.00086
0.0336	

2.15
0.0005
0.00896	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	
Greenfield Environmental Multistate Trust LLC  
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.037
0.015
0.0046	

0.039
0.00025
0.000081	

0.035
0.00025
0.000073	

0.0346
0.00025
0.000072	

0.03
0.00025
0.000063	

0.035
0.00025
0.000073	
TVA Caledonia Combined Cycle Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day: 	

0.514
0.001
0.004	

0.773
0.002
0.01	

0.842
0.002
0.01	

0.586
0.001
0.01	

0.62
NODI=B
NODI=B	

0.706
NODI=B
NODI=B	
DOMESTIC FLOW, MGD:	2.459	6.138	1.233	4.5094	4.04	1.409	
DOMESTIC LOAD, lb/day:	0.0858	0.050719	0.006627	0.028828	0.033537	0.008887	
DOMESTIC CONC., mg/L:	0.0042	0.00099	0.00064	0.00077	0.0010	0.00076	
DATA FOR CHROMIUM (Cr) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Chromium (Cr) = BGC 0.0014 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  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

3.01
0.0590
1.48	

6.95
No data
No data	

2.11
0.01099
0.193	

5.13
0.01024
0.438	

4.69
0.01323
0.517	

2.15
0.01033
0.185	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	
Greenfield Environmental Multistate Trust LLC  
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.037
0.01
0.0026	

0.039
0.00271
0.00068	

0.035
0.00271
0.00068	

0.0346
0.00271
0.00068	

0.03
0.00271
0.00068	

0.035
0.00271
0.00068	
TVA Caledonia Combined Cycle Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day: 	

0.514
Not permitted
Not permitted	

0.773
Not permitted
Not permitted	

0.842
Not permitted
Not permitted	

0.586
Not permitted
Not permitted	

0.62
Not permitted
Not permitted	

0.706
Not permitted
Not permitted	
DOMESTIC FLOW, MGD:	2.973	6.911	2.075	5.0954	4.66	2.115	
DOMESTIC LOAD, lb/day:	1.4774	No data	0.19232	0.43732	0.51632	0.18432	
DOMESTIC CONC., mg/L:	0.060	No data	0.011	0.010	0.013	0.010	
DATA FOR COPPER (Cu) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Copper (Cu) = BGC = 0.021 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  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

3.01
0.009795
0.246	

6.95
No data
No data	

2.11
0.00104
0.0183	

5.13
0.0017435
0.0746	

4.69
0.001855
0.0725	

2.15
0.00148
0.0265	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	
Greenfield Environmental Multistate Trust LLC  
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.037
Not permitted
Not permitted	

0.039
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	

0.0346
Not permitted
Not permitted	

0.03
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	
TVA Caledonia Combined Cycle Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day: 	

0.514
Not permitted
Not permitted	

0.773
Not permitted
Not permitted	

0.842
Not permitted
Not permitted	

0.586
Not permitted
Not permitted	

0.62
Not permitted
Not permitted	

0.706
Not permitted
Not permitted	
DOMESTIC FLOW, MGD:	3.01	6.95	2.11	5.13	4.69	2.15	
DOMESTIC LOAD, lb/day:	0.246	No data	0.0183	0.0746	0.0725	0.0265	
DOMESTIC CONC., mg/L:	0.009795	No data	0.00104	0.0017435	0.001855	0.00148	
DATA FOR LEAD (Pb) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Lead (Pb) = BGC = 0.00318 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  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

3.01
0.01495
0.375	

6.95
No data
No data	

2.11
0.006555
0.115	

5.13
0.00875
0.374	

4.69
0.003105
0.121	

2.15
0.00804
0.144	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	
Greenfield Environmental Multistate Trust LLC  
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.037
Not permitted
Not permitted	

0.039
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	

0.0346
Not permitted
Not permitted	

0.03
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	
TVA Caledonia Combined Cycle Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day: 	

0.514
Not permitted
Not permitted	

0.773
Not permitted
Not permitted	

0.842
Not permitted
Not permitted	

0.586
Not permitted
Not permitted	

0.62
Not permitted
Not permitted	

0.706
Not permitted
Not permitted	
DOMESTIC FLOW, MGD:	3.01	6.95	2.11	5.13	4.69	2.15	
DOMESTIC LOAD, lb/day:	0.375	No data	0.115	0.374	0.121	0.144	
DOMESTIC CONC., mg/L:	0.01495	No data	0.006555	0.00875	0.003105	0.00804	
DATA FOR NICKEL (Ni) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Nickel (Ni) = BGC = 0.00828 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  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

3.01
0.0010315
0.0259	

6.95
0.0000820
0.00475	

2.11
0.0002205
0.00388	

5.13
0.0000895
0.00383	

4.69
0.0002025
0.00792	

2.15
0.0001285
0.00230	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	
Greenfield Environmental Multistate Trust LLC  
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.037
Not permitted
Not permitted	

0.039
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	

0.0346
Not permitted
Not permitted	

0.03
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	
TVA Caledonia Combined Cycle Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day: 	

0.514
Not permitted
Not permitted	

0.773
Not permitted
Not permitted	

0.842
Not permitted
Not permitted	

0.586
Not permitted
Not permitted	

0.62
Not permitted
Not permitted	

0.706
Not permitted
Not permitted	
DOMESTIC FLOW, MGD:	3.01	6.95	2.11	5.13	4.69	2.15	
DOMESTIC LOAD, lb/day:	0.0259	0.00475	0.00388	0.00383	0.00792	0.00230	
DOMESTIC CONC., mg/L:	0.0010315	0.0000820	0.0002205	0.0000895	0.0002025	0.0001285	
DATA FOR SILVER (Ag) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Silver (Ag) = BGC = 0.000292 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  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

3.01
0.2565
6.44	

6.95
No data
No data	

2.11
0.04175
0.735	

5.13
0.1129
4.83	

4.69
0.0513
2.01	

2.15
0.04235
0.759	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

NODI=C
NODI=C
NODI=C	

NODI=C
NODI=C
NODI=C	

NODI=C
NODI=C
NODI=C	

NODI=C
NODI=C
NODI=C	

NODI=C
NODI=C
NODI=C	

NODI=C
NODI=C
NODI=C	
Greenfield Environmental Multistate Trust LLC  
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.037
Not permitted
Not permitted	

0.039
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	

0.0346
Not permitted
Not permitted	

0.03
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	
TVA Caledonia Combined Cycle Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day: 	

0.514
0.11
0.64	

0.773
0.07
0.51	

0.842
0.12
0.9	

0.586
0.1
0.65	

0.62
0.07
0.36	

0.706
0.11
0.65	
DOMESTIC FLOW, MGD:	2.496	6.177	1.268	4.544	4.07	1.444	
DOMESTIC LOAD, lb/day:	5.80	No data	No data	4.18	1.65	0.109	
DOMESTIC CONC., mg/L:	0.279	No data	No data	0.110	0.0486	0.00905	
DATA FOR ZINC (Zn) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Zinc (Zn) = BGC 0.112 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  	
Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day:	

3.01
0.0025
0.0627	

6.95
0.0025
0.145	

2.11
0.0025
0.0440	

5.13
0.0025
0.107	

4.69
0.0025
0.0978	

2.15
0.0025
0.0448	
Waste Management of Mississippi Inc, Prairie Bluff Landfill and Recycling Center
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	

NODI=C
Not permitted
Not permitted	
Greenfield Environmental Multistate Trust LLC  
Flow, MGD:
Conc.*, mg/L:
Load*, lb/day:	

0.037
Not permitted
Not permitted	

0.039
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	

0.0346
Not permitted
Not permitted	

0.03
Not permitted
Not permitted	

0.035
Not permitted
Not permitted	
TVA Caledonia Combined Cycle Plant
Flow*, MGD:
Conc., mg/L:
Load, lb/day: 	

0.514
Not permitted
Not permitted	

0.773
Not permitted
Not permitted	

0.842
Not permitted
Not permitted	

0.586
Not permitted
Not permitted	

0.62
Not permitted
Not permitted	

0.706
Not permitted
Not permitted	
DOMESTIC FLOW, MGD:	3.01	6.95	2.11	5.13	4.69	2.15	
DOMESTIC LOAD, lb/day:	0.0627	0.145	0.0440	0.107	0.0978	0.0448	
DOMESTIC CONC., mg/L:	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	
DATA FOR CYANIDE (CN) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Cyanide (CN) = BGC = 0.0025 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 A.2

OUTFALL 002: GREENWOOD POTW    

BACKGROUND CONCENTRATION OF DOMESTIC SEWAGE*

Cadmium (Cd):		BGC = 	0.00011 mg/L
Chromium (Cr):		BGC =	0.025 mg/L
Copper (Cu):		BGC =	0.024 mg/L
Lead (Pb):			BGC = 	0.0046 mg/L
Nickel (Ni):			BGC = 	0.018 mg/L
Silver (Ag):			BGC =	0.00018 mg/L
Zinc (Zn):			BGC = 	0.11 mg/L
Cyanide (CN)		BGC =	0.005 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.

 

	October 
2008	November 
2008	December 
2008	January 
2009	February 
2009	March 
2009  	
Greenwood POTW  

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

1.877
0.00025
0.003913	

1.86
0.00025
0.00388	

2.376
0.00025
0.004953	

2.31
0.00025
0.00482	

2.13
0.00025
0.00444	

2.182
0.00025
0.004548	
Viking Range Corporation, Cooking Plant, East Site  

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

0.0117
0.02
0.0018	

0.0117
0.02
0.0018	

0.0117
0.02
0.0018	

0.0141
0.02
0.0019	

0.0141
0.02
0.0019	

0.0141
0.02
0.0019	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill

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

0.01
Not permitted
Not permitted	

0.0125
Not permitted
Not permitted	

0.0133
Not permitted
Not permitted	

0.0202
Not permitted
Not permitted	

0.0119
Not permitted
Not permitted	

0.0129
Not permitted
Not permitted	
Viking Range Corporation, Highway 82 West Site

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

0.0022
0.02
0.0005	

0.0022
0.02
0.0005	

0.0022
0.02
0.0005	

0.0034
0.02
0.00042	

0.0034
0.02
0.00042	

0.0034
0.02
0.00042	
DOMESTIC FLOW, MGD:	1.8631	1.8461	2.3621	2.2925	2.1125	2.1645	
DOMESTIC LOAD, lb/day:	0.001613	0.00158	0.002653	No data	No data	No data	
DOMESTIC CONC., mg/L:	0.00010	0.00010	0.00013	No data	No data	No data	
DATA FOR CADMIUM (Cd) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Cadmium (Cd) = BGC = 0.00011 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.  

	October 
2008	November 
2008	December 
2008	January 
2009	February 
2009	March 
2009  	
Greenwood POTW  

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

1.877
0.025
0.3913	

1.86
0.025
0.388	

2.376
0.025
0.4953	

2.31
0.025
0.482	

2.13
0.025
0.444	

2.182
0.025
0.4548	
Viking Range Corporation, Cooking Plant, East Site  

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

0.0117
0.05
0.0044	

0.0117
0.05
0.0044	

0.0117
0.05
0.0044	

0.0141
0.05
0.0047	

0.0141
0.05
0.0047	

0.0141
0.05
0.0047	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill

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

0.01
0.007
0.0006	

0.0125
0.0288
0.003	

0.0133
NODI=B
NODI=B	

0.0202
0.0292
0.0049	

0.0119
0.013
0.0013	

0.0129
NODI=B
NODI=B	
Viking Range Corporation, Highway 82 West Site

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

0.0022
0.05
0.0012	

0.0022
0.05
0.0012	

0.0022
0.05
0.0012	

0.0034
0.05
0.0011	

0.0034
0.05
0.0011	

0.0034
0.05
0.0011	
DOMESTIC FLOW, MGD:	1.8531	1.8336	2.3488	2.2723	2.1006	2.1516	
DOMESTIC LOAD, lb/day:	0.3851	0.3794	0.4897	0.4713	0.4369	0.4490	
DOMESTIC CONC., mg/L:	0.025	0.025	0.025	0.025	0.025	0.025	
DATA FOR CHROMIUM (Cr) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Chromium (Cr) = BGC = 0.025 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.  

	October 
2008	November 
2008	December 
2008	January 
2009	February 
2009	March 
2009  	
Greenwood POTW  

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

1.877
0.040
0.63	

1.86
0.022
0.34	

2.376
0.011
0.22	

2.31
0.030
0.58	

2.13
0.0235
0.42	

2.182
0.0205
0.37	
Viking Range Corporation, Cooking Plant, East Site  

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

0.0117
0.053
0.0047	

0.0117
0.053
0.0047	

0.0117
0.053
0.0047	

0.0141
0.081
0.0078	

0.0141
0.081
0.0078	

0.0141
0.081
0.0078	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill

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

0.01
NODI=B
NODI=B	

0.0125
0.03
0.003	

0.0133
NODI=B
NODI=B	

0.0202
0.0329
0.0055	

0.0119
0.2487
0.0247	

0.0129
0.188
0.0202	
Viking Range Corporation, Highway 82 West Site

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

0.0022
0.074
0.00165	

0.0022
0.074
0.00165	

0.0022
0.074
0.00165	

0.0034
0.079
0.0017	

0.0034
0.079
0.0017	

0.0034
0.079
0.0017	
DOMESTIC FLOW, MGD:	1.8531	1.8336	2.3488	2.2723	2.1006	2.1516	
DOMESTIC LOAD, lb/day:	0.62365	0.33065	0.21365	0.565	0.3858	0.3403	
DOMESTIC CONC., mg/L:	0.040	0.022	0.011	0.030	0.022	0.019	
DATA FOR COPPER (Cu) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Copper (Cu) = BGC = 0.024 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.  

	October 
2008	November 
2008	December 
2008	January 
2009	February 
2009	March 
2009  	
Greenwood POTW  

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

1.877
0.0075
0.1	

1.86
0.010
0.16	

2.376
0.004
0.08	

2.31
0.003
0.06	

2.13
0.0035
0.06	

2.182
0.002
0.04	
Viking Range Corporation, Cooking Plant, East Site  

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

0.0117
0.05
0.0044	

0.0117
0.05
0.0044	

0.0117
0.05
0.004	

0.0141
0.05
0.0047	

0.0141
0.05
0.0047	

0.0141
0.05
0.0047	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill

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

0.01
NODI=B
NODI=B	

0.0125
NODI=B
NODI=B	

0.0133
NODI=B
NODI=B	

0.0202
NODI=B
NODI=B	

0.0119
0.05
0.005	

0.0129
NODI=B
NODI=B	
Viking Range Corporation, Highway 82 West Site

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

0.0022
0.05
0.0012	

0.0022
0.05
0.0012	

0.0022
0.05
0.0012	

0.0034
0.05
0.0011	

0.0034
0.05
0.0011	

0.0034
0.05
0.0011	
DOMESTIC FLOW, MGD:	1.8531	1.8336	2.3488	2.2723	2.1006	2.1516	
DOMESTIC LOAD, lb/day:	0.0944	0.1544	0.0748	0.0542	0.0492	0.0342	
DOMESTIC CONC., mg/L:	0.0061	0.010	0.0038	0.0029	0.0028	0.0019	
DATA FOR LEAD (Pb) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Lead (Pb) = BGC = 0.0046 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.  

	October 
2008	November 
2008	December 
2008	January 
2009	February 
2009	March 
2009  	
Greenwood POTW  

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

1.877
0.01
0.2	

1.86
0.01
0.2	

2.376
0.05
1	

2.31
0.02
0.4	

2.13
0.01
0.2	

2.182
0.01
0.2	
Viking Range Corporation, Cooking Plant, East Site  

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

0.0117
0.11
0.009	

0.0117
0.11
0.009	

0.0117
0.11
0.009	

0.0141
0.024
0.0022	

0.0141
0.024
0.0022	

0.0141
0.024
0.0022	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill

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

0.01
0.162
0.014	

0.0125
0.165
0.017	

0.0133
0.199
0.022	

0.0202
0.167
0.028	

0.0119
0.193
0.019	

0.0129
0.19
0.02	
Viking Range Corporation, Highway 82 West Site

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

0.0022
0.02
0.0005	

0.0022
0.02
0.0005	

0.0022
0.02
0.0005	

0.0034
0.08
0.0017	

0.0034
0.08
0.0017	

0.0034
0.08
0.0017	
DOMESTIC FLOW, MGD:	1.8531	1.8336	2.3488	2.2723	2.1006	2.1516	
DOMESTIC LOAD, lb/day:	0.1765	0.1735	0.9685	0.3681	0.1771	0.1761	
DOMESTIC CONC., mg/L:	0.011	0.011	0.049	0.019	0.010	0.0098	
DATA FOR NICKEL (Ni) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Nickel (Ni) = BGC = 0.018 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.  

	October 
2008	November 
2008	December 
2008	January 
2009	February 
2009	March 
2009  	
Greenwood POTW  

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

1.877
0.0002
0.003	

1.86
0.0002
0.003	

2.376
0.0002
0.004	

2.31
0.0002
0.004	

2.13
0.000225
0.004	

2.182
0.00025
0.0045	
Viking Range Corporation, Cooking Plant, East Site  

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

0.0117
0.005
0.00044	

0.0117
0.005
0.00044	

0.0117
0.005
0.00044	

0.0141
0.005
0.0005	

0.0141
0.005
0.0005	

0.0141
0.005
0.0005	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill

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

0.01
Not permitted
Not permitted	

0.0125
Not permitted
Not permitted	

0.0133
Not permitted
Not permitted	

0.0202
Not permitted
Not permitted	

0.0119
Not permitted
Not permitted	

0.0129
Not permitted
Not permitted	
Viking Range Corporation, Highway 82 West Site

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

0.0022
0.005
0.0002	

0.0022
0.005
0.0002	

0.0022
0.005
0.0002	

0.0034
0.005
0.0001	

0.0034
0.005
0.0001	

0.0034
0.005
0.0001	
DOMESTIC FLOW, MGD:	1.8631	1.8461	2.3621	2.2925	2.1125	2.1645	
DOMESTIC LOAD, lb/day:	0.00236	0.00236	0.00336	0.00340	0.00340	0.0039	
DOMESTIC CONC., mg/L:	0.00015	0.00015	0.00017	0.00018	0.00019	0.00022	
DATA FOR SILVER (Ag) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Silver (Ag) = BGC = 0.00018 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.  

	October 
2008	November 
2008	December 
2008	January 
2009	February 
2009	March 
2009  	
Greenwood POTW  

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

1.877
0.1635
2.56	

1.86
0.204
3.16	

2.376
0.0415
0.82	

2.31
0.095
1.8	

2.13
0.075
1.3	

2.182
0.0715
1.3	
Viking Range Corporation, Cooking Plant, East Site  

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

0.0117
0.047
0.0042	

0.0117
0.047
0.0042	

0.0117
0.047
0.0042	

0.0141
0.05
0.0045	

0.0141
0.05
0.0045	

0.0141
0.05
0.0045	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill

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

0.01
NODI=B
NODI=B	

0.0125
0.066
0.007	

0.0133
0.186
0.021	

0.0202
0.047
0.008	

0.0119
0.045
0.004	

0.0129
0.054
0.006	
Viking Range Corporation, Highway 82 West Site

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

0.0022
0.043
0.00093	

0.0022
0.043
0.00093	

0.0022
0.043
0.00093	

0.0034
0.029
0.0006	

0.0034
0.029
0.0006	

0.0034
0.029
0.0006	
DOMESTIC FLOW, MGD:	1.8531	1.8336	2.3488	2.2723	2.1006	2.1516	
DOMESTIC LOAD, lb/day:	2.55487	3.14787	0.79387	1.7869	1.2909	1.2889	
DOMESTIC CONC., mg/L:	0.17	0.21	0.041	0.094	0.074	0.072	
DATA FOR ZINC (Zn) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Zinc (Zn) = BGC = 0.11 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.  

	October 
2008	November 
2008	December 
2008	January 
2009	February 
2009	March 
2009  	
Greenwood POTW  

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

1.877
No data
No data	

1.86
0.005
0.08	

2.376
0.005
0.1	

2.31
0.005
0.1	

2.13
0.005
0.09	

2.182
0.005
0.09	
Viking Range Corporation, Cooking Plant, East Site  

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

0.0117
0.01
0.0009	

0.0117
0.01
0.0009	

0.0117
0.01
0.0009	

0.0141
0.01
0.0011	

0.0141
0.01
0.0011	

0.0141
0.01
0.0011	
Leflore County Board of Supervisors, Leflore County Municipal Solid Waste Landfill

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

0.01
Not permitted
Not permitted	

0.0125
Not permitted
Not permitted	

0.0133
Not permitted
Not permitted	

0.0202
Not permitted
Not permitted	

0.0119
Not permitted
Not permitted	

0.0129
Not permitted
Not permitted	
Viking Range Corporation, Highway 82 West Site

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

0.0022
0.01
0.0003	

0.0022
0.01
0.0003	

0.0022
0.01
0.0003	

0.0034
0.01
0.00021	

0.0034
0.01
0.00021	

0.0034
0.01
0.00021	
DOMESTIC FLOW, MGD:	1.8631	1.8461	2.3621	2.2925	2.1125	2.1645	
DOMESTIC LOAD, lb/day:	No data	0.0788	0.0988	0.09869	0.08869	0.08869	
DOMESTIC CONC., mg/L:	No data	0.005	0.005	0.005	0.005	0.005	
DATA FOR CYANIDE (CN) BACKGROUND/DOMESTIC CONCENTRATION
Average Domestic Concentration for Cyanide (CN) = BGC = 0.005 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.1

OUTFALL 001 – Columbus, City of, Reynolds R Ridgley Wastewater Treatment Plant  

REMOVAL EFFICIENCIES

(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.  

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

*Due to inadequate data from the actual POTW, MDEQ study data for activated sludge systems was used.   

[mg/L]	

12/1/14	

12/8/14	

1/7/15	

1/14/15	

2/11/15	

2/18/15	

3/11/15	

3/18/15	

4/8/15

4/15/15	

5/13/15	

5/21/15	
Removal Efficiency1	
Cd
Inf.	0.00243	0.00210	0.000286	0.000152	0.000292	0.000391	0.000523	0.000229	0.000227	0.000430	0.000115	0.000213	

89.7 %	
Cd
Eff.	0.00005	0.000159	0.000373	0.000320	0.000102	0.00005	0.000106	0.00005	0.00005	0.00005	0.00005	0.00005		
Cr
Inf.	0.00484	0.00268	0.0005	0.00160	0.00140	0.0005	0.00132	0.0005	0.0005	0.00122	0.0005	0.0005	

62.6 %
	
Cr
Eff.	0.0005	0.0005	0.0005	0.00156	0.00133	0.0005	0.0005	0.0005	0.0005	0.0005	0.0005	0.0005		
Cu
Inf.	0.0771	0.0409	0.00393	0.00481	0.0130	0.00898	0.0127	0.00778	0.00996	0.0165	0.00816	0.0125	

85.6 %	
Cu
Eff.	0.00333	0.00414	0.00580	0.00499	0.00298	0.00278	0.00314	0.00272	0.00174	0.00328	0.00218	0.00350		
Pb
Inf.	0.0134	0.00619	0.000250	0.000614	0.00107	0.00101	0.00252	0.000967	0.00128	0.00243	0.00125	0.00171	

92.1 %	
Pb
Eff.	0.000250	0.000250	0.000558	0.000685	0.000250	0.000250	0.000250	0.000250	0.000250	0.000250	0.000250	0.000250		
Ni
Inf.	0.0163	0.0136	0.00256	0.00233	0.0105	0.00261	0.0137	0.00380	0.00267	0.00354	0.00276	0.00804	

50.4 %	
Ni
Eff.	0.00905	0.00722	0.00264	0.00246	0.00593	0.00219	0.00241	0.00366	0.00160	0.00176	0.00325	0.00326		
Ag
Inf.	0.00126	0.000803	0.00005	0.000114	0.000107	0.000334	0.000129	0.00005	0.000127	0.000278	0.00005	0.000207	

86.6 %	
Ag
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		
Zn
Inf.	0.344	0.169	0.0311	0.0263	0.0417	0.0418	0.0468	0.179	0.0438	0.0588	0.0360	0.0487	

72.1 %	
Zn
Eff.	0.0434	0.0376	0.0458	0.0396	0.0284	0.0284	0.0240	0.0250	0.0215	0.0233	0.0249	0.0249		
CN
Inf.	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	

62 %*	
CN
Eff.	0.0025	0.0025	0.00200	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025	0.0025		

APPENDIX B.2

OUTFALL 002 – Greenwood POTW  

REMOVAL EFFICIENCIES

(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.  

Blue Values were used in “non-detect” results where the Detection Limit was then divided by 2 to obtain the blue value.  

*Due to inadequate data from the actual POTW, MDEQ study data for trickling filter systems was used.   

[mg/L]	

10/21/08	

10/23/08	

11/6/08	

11/20/08	

12/11/08	

12/18/08	

1/13/09	

1/22/09	

2/12/09

2/19/09	

3/12/09	

3/19/09	
Removal Efficiency1	
Cd
Inf.	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	

10 %*	
Cd
Eff.	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025	0.00025		
Cr
Inf.	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	

55 %*
	
Cr
Eff.	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.025		
Cu
Inf.	0.042	0.038	0.022	0.023	0.002	0.020	0.026	0.034	0.042	0.005	0.036	0.005	

41.0 %	
Cu
Eff.	0.018	0.023	0.016	0.026	0.0025	0.0025	0.017	0.023	0.020	0.005	0.034	0.005		
Pb
Inf.	0.004	0.011	0.002	0.010	0.004	0.002	0.004	0.002	0.005	0.002	0.002	0.002	

70.7 %	
Pb
Eff.	0.0005	0.001	0.003	0.001	0.003	0.002	0.001	0.001	0.003	0.001	0.001	0.001		
Ni
Inf.	0.01	0.01	0.01	0.01	0.01	0.09	0.03	0.01	0.01	0.01	0.01	0.01	

83.3 %	
Ni
Eff.	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01		
Ag
Inf.	0.0002	0.0002	0.0002	0.0002	0.0002	0.0002	0.0002	0.0002	0.0002	0.0025	0.0025	0.0025	

62 %*	
Ag
Eff.	0.00015	0.00015	0.00015	0.00015	0.00015	0.00015	0.00015	0.00015	0.00015	0.0025	0.0025	0.0025		
Zn
Inf.	0.116	0.211	0.0125	0.204	0.047	0.036	0.126	0.064	0.087	0.063	0.063	0.080	

61.9 %	
Zn
Eff.	0.032	0.044	0.037	0.048	0.030	0.0125	0.077	0.044	0.0125	0.025	0.051	0.042		
CN
Inf.	0.005	0.005	0.005	0.005	0.005	0.005	0.005	0.005	0.005	0.005	0.005	0.005	

59 %*	
CN
Eff.	0.03	0.03	0.005	0.03	0.005	0.005	0.005	0.01	0.005	0.01	0.005	0.005		

ADEQUACY OF TREATMENT

Date:					September 2017    
Project Manager:			Carter Cress
Proposed Site:			Waste Management of Mississippi Inc.
					Prairie Bluff Landfill and Recycling Center  
					Pretreatment Permit No. MSP090940  
					Chickasaw County  
Address:				1649 Highway 15 North
					Houston, MS  38851  

Proposed Hydraulic Loading:	0.00526 MGD (long-term avg.; from permit application)
Proposed Organic Loading:	146.13 mg/L (long-term avg..; from permit application); 
146.13 mg/L *8.34*0.00526 MGD =                      6.41 lb/day (avg.) 

Greenwood POTW, NPDES Permit# MS0023833, AI# 13155
Permitted Flow:	6.32 MGD avg.
12 Months Flow:	4.036 MGD maximum avg. value (DMR data from August 2016 through July 2017)
12 Months BOD5: 	7,159 lb/day maximum monthly avg. influent (DMR data from August 2016 through July 2017)

Evaluation of Flow
6.32 MGD permitted – 4.036 MGD actual = 2.28 MGD available vs. 0.00526 MGD proposed

Evaluation of BOD5
Permitted flow 6,320,000 gpd/(100 gallons/person/day) = 63,200 population equivalency
63,200*0.17 lb BOD/person/day = 10,744 lb/day BOD capacity
10,744 lb/day available – 7,159 lb/day (avg. POTW influent) = 3,585 lb/day
3,585 lb/day available vs. 6.41 lb/day proposed