Title: PERMIT RATIONALE
Author: Preferred Customer
Last saved by: Samar Patel
Company: Dell Computer Corporation

PERMIT RATIONALE FOR REISSUANCE
Rain CII Carbon LLC
Lamar County
Purvis, Mississippi
Water NPDES No. MS0001601
April 2024

I.	FACILITY INFORMATION

Facility Name:  Rain CII Carbon LLC
Facility Address: 863 Old Richburg Road 
Purvis, MS  39475    
Purvis, 
Permit No.:  MS0001601
SIC:  2999
Permit Writer:  Samar Patel
EPD Branch:  Chemical Branch

II.	NATURE OF BUSINESS

At the Purvis Calcining Plant, green petroleum coke is off-loaded from trucks or rail cars into process storage tanks or into a covered storage area.  The coke is then transferred by covered conveyor and bucket elevator and fed into a natural gas fired countercurrent rotary kiln.  The product, calcined fluid coke, is discharged from the kiln into a rotary cooler where it is quenched by water and transported by covered conveyor to enclosed storage tanks for shipment via truck or railcar.  All quench water is evaporated in the cooler and discharged to the atmosphere as steam.  No process water is discharged from the facility.  

III.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Outfall 001 consists of non-contact cooling water used for equipment cooling.  Storm water associated with industrial activities is generated where storm water contacts areas of industrial activity.  This storm water is also discharged through this outfall.  The flow rate reported in the application is 0.48 MGD.  

Outfall 002 consists of excess well water.  The average flow rate of this outfall is 0.025 MGD.  

The receiving stream is an unnamed tributary of Black Creek which has a 7Q10 flow of zero.  Black Creek is in the Pascagoula River Basin.

IV.	303(d) ISSUES

The receiving stream is in the Pascagoula River Basin and is classified as fish and wildlife. The section of the receiving stream segment, where the facility discharges into the Black River, does appear on the updated State of Mississippi 303(d) List of Impaired Water bodies. However, based on the type of discharge, they will not adversely affect Biological Impairment in Black River and as such no monitoring requirements are proposed in the permit at this time.

V.	TYPE OF WASTEWATER TREATMENT:

None

VI.	EPA APPLICABLE CATEGORICAL GUIDELINES

None

VII.	DATA FROM APPLICATION FORM (2E)

	Outfall 001:
Parameter | Maximum Daily Value (mg/L)
BOD_5^1 | <2.0
TSS^1 | <0.1
Oil and Grease^1 | <3.3
COD^1 | 9.4
TOC^1 | <2.0
Ammonia (as N)^1 | 0.5
Flow | 0.48 MGD (Max)
pH | 7.3 – 8.4 s.u.
Temperature | 29.44°C
	^1 These pollutants are exempt for application testing based on the correspondence dated 
               July 31, 2023. As such, the data used in the above table were from the previous permit 
               renewal application. 

VIII. 	WATER QUALITY LIMITATIONS BASED ON WASTELOAD ALLOCATION 
	
	Not applicable.

IX.	CATEGORICAL GUIDELINE LIMITATIONS CALCULATIONS

Not applicable

X.	TOXICITY SCREENING

Not applicable

XI.	PROPOSED FINAL LIMITATIONS 

1.	Average Permit Limitations

Outfall | Parameter | Water Quality Limitation | Present Permit Limitation | Proposed Permit Limitation | Sample Type | Basis
MS0001601-001 | Flow | -- | Report Annual Average | Report Annual Average | Instantaneous | PPL
MS0001601-002 | Flow | -- | Report Annual Average | Report Annual Average | Instantaneous | PPL

2.	Maximum Permit Limitations

Outfall | Parameter | Water Quality Limitation | Present Permit Limitation | Proposed Permit Limitation | Sample Type | Basis^1
MS0001601-001 | Temperature | -- | 90°F | 90°F | Grab | WQC
| pH | 6.0 – 9.0 s.u. | 6.0 – 9.0 s.u. | 6.0 – 9.0 s.u. | Grab | WQC
MS0001601-002 | pH | 6.0 – 9.0 s.u. | 6.0 – 9.0 s.u. | 6.0 – 9.0 s.u. | Grab | WQC
^1WQC = State of Mississippi Water Quality Criteria for Intrastate, Interstate, and Coastal Waters; PPL = Previous Permit Limit

All monitoring is to be done semiannually.

Standard permit language requiring a Storm Water Pollution Prevention Plan (SWPPP) has been included, consistent with the requirements of Mississippi’s Baseline Storm Water General Permit.

7112 PER20230002