PERMIT RATIONALE FOR REISSUANCE
Oil Dri Production Company
Tippah County
Ripley, Mississippi
Water NPDES No. MS0033812
May 20, 2013

I.	FACILITY INFORMATION

Facility Name:  Oil Dri Production Company
Facility Address:  1800 1/2 Highway 15 North
Ripley, MS  38663
Ripley, 
Permit No.:  MS0033812
SIC:  3295
Permit Writer:  Michael Griffith
EPD Branch:  Construction and Building Materials Branch

II.	NATURE OF BUSINESS

Oil-Dri Production Company’s operations include the mining, processing, and packaging of Fuller’s Earth products.  This activity is identified by Standard Industrial Classification (SIC) code 3295 (Minerals and Earth).

III.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Outfall 001 discharges into an unnamed tributary thence into Town Creek (7Q10 = 0.00 cfs).

IV.	303(d) ISSUES

The receiving stream, Town Creek, does not appear on the 2012 303(d) list.

V.	TYPE OF WASTEWATER TREATMENT:

Outfall 001:  Lime for pH control, polymer flocculant, and sedimentation.

VI.	EPA APPLICABLE CATEGORICAL GUIDELINES

None applicable

VII.	DATA FROM APPLICATION FORM (Enter the type of application, i.e. 2D)

Parameter	Maximum Daily Value	
BOD	6 mg/L	
COD	36 mg/L	
TOC	7.49 mg/L	
TSS	19 mg/L	
Ammonia (as N)	10.7 mg/L	
Flow	350 gal/min	
Temperature (winter)	ambient	
Temperature (summer)	ambient	
pH	5.5 – 8.5 S.U.	

VIII. 	WATER QUALITY LIMITATIONS BASED ON WASTELOAD ALLOCATION 

	None recommended per Shawn Clark.

IX.	CATEGORICAL GUIDELINE LIMITATIONS CALCULATIONS

Not applicable

X.	TOXICITY SCREENING

Not applicable

XI.	PROPOSED FINAL LIMITATIONS 

1.	Average Permit Limitations (Phase I)

Outfall	Parameter	Categorical Limitation	Water Quality Limitation	Present Permit Limitation	Proposed Permit Limitation	Basis	
MS0033812-001	Flow			Report	Report	BPJ	
	pH		6.0 S.U. (min)	6.0 S.U. (min)	6.0 S.U. (min)	MSWQS	
	TDS		750 mg/L	Report	Report	MSWQS	
	TSS		30 mg/L	30 mg/L	30 mg/L	BPJ	

2.	Maximum Permit Limitations (Phase I)

Outfall	Parameter	Categorical Limitation	Water Quality Limitation	Present Permit Limitation	Proposed Permit Limitation	Basis	
MS0033812-001	Flow			Report	Report	BPJ	
	pH		9.0 S.U. (max)	9.0 S.U. (max)	9.0 S.U. (max)	MSWQS	
	TDS		1500 mg/L	Report	Report	MSWQS	
	TSS			90 mg/L	90 mg/L	BPJ	

pH, TDS, and TSS shall be monitored twice per month with a grab sample of the effluent.  Flow shall be monitored twice per month with an instantaneous sample.  Permittee shall report TDS concentrations during Phase I of the permit.  Phase I began on the issuance date of the previous permit and will end June 29, 2013.

3.	Average Permit Limitations (Phase II)

Outfall	Parameter	Categorical Limitation	Water Quality Limitation	Present Permit Limitation	Proposed Permit Limitation	Basis	
MS0033812-001	Flow			Report	Report	BPJ	
	pH		6.0 S.U. (min)	6.0 S.U. (min)	6.0 S.U. (min)	MSWQS	
	TDS		750 mg/L	Report	750 mg/L	MSWQS	
	TSS		30 mg/L	30 mg/L	30 mg/L	BPJ	

4.	Maximum Permit Limitations (Phase I)

Outfall	Parameter	Categorical Limitation	Water Quality Limitation	Present Permit Limitation	Proposed Permit Limitation	Basis	
MS0033812-001	Flow			Report	Report	BPJ	
	pH		9.0 S.U. (max)	9.0 S.U. (max)	9.0 S.U. (max)	MSWQS	
	TDS		1500 mg/L	Report	1500 mg/L	MSWQS	
	TSS			90 mg/L	90 mg/L	BPJ	

pH, TDS, and TSS shall be monitored twice per month with a grab sample of the effluent.  Flow shall be monitored twice per month with an instantaneous sample.  Phase II will begin June 30, 2013.

XII.	BPJ STATEMENT: 

It is our Best Professional Judgement that the foregoing limitations represent NSPS and BPJ.