TMDL Document for TOTAL MAXIMUM DAILY LOAD (TMDL) FOR PH AND IRON IN THE BEAR CREEK SUBWATERSHED LOCATED IN THE SOUTH FORK CUMBERLAND RIVER WATERSHED (HUC 05130104)

TMDL ID:	32671	TMDL Name:	TOTAL MAXIMUM DAILY LOAD (TMDL) FOR PH AND IRON IN THE BEAR CREEK SUBWATERSHED LOCATED IN THE SOUTH FORK CUMBERLAND RIVER WATERSHED (HUC 05130104)
State/Tribe:	Tennessee	TMDL Date:	08/01/2007
EPA Action:	EPA Approved

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TMDL Pollutant: Iron

Total Waste Load Allocation:			Total Load Allocation:
Explicit Margin Of Safety:			Implicit Margin Of Safety:	Y
Units for Total Waste Load Allocation and Total Load Allocation:			TMDL Pollutant Source Type:	Nonpoint Source
TMDL End Point:	DERIVED FROM NATIONAL RECOMMENDED WATER QUALITY CRITERIA (USEPA, 2006): IRON, TOTAL* 1000 ÌG/L. NOTE: TENNESSEE DOES NOT HAVE A NUMERIC WATER QUALITY CRITERION FOR IRON. HOWEVER,TDEC BELIEVES THAT MEETING THE ABOVE CRITERIA WILL SATISFY THE REQUIREMENT THAT ¿WATERS SHALL NOT CONTAIN SUBSTANCES OR A COMBINATION OF SUBSTANCES INCLUDING DISEASE-CAUSING AGENTS WHICH, BY WAY OF EITHER DIRECT EXPOSURE OR INDIRECT EXPOSURE THROUGH FOOD CHAINS, MAY CAUSE DEATH, DISEASE, BEHAVIORAL ABNORMALITIES, CANCER, GENETIC MUTATIONS, PHYSIOLOGICAL MALFUNCTIONS (INCLUDING MALFUNCTIONS IN REPRODUCTION), PHYSICAL DEFORMATIONS, OR RESTRICT OF IMPAIR GROWTH IN FISH OR AQUATIC LIFE OR THEIR OFFSPRING¿.

Listed Water Causes of Impairment for Iron Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit.
Waterbody ID	Waterbody Name	Map	Cycles Listed	Cause(s) of Impairment Addressed
TN05130104050_0100	East Branch Bear Creek	Waterbody Map	2002, 2004, 2006	Iron

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TMDL Pollutant: pH

Total Waste Load Allocation:			Total Load Allocation:
Explicit Margin Of Safety:			Implicit Margin Of Safety:	N
Units for Total Waste Load Allocation and Total Load Allocation:			TMDL Pollutant Source Type:	Nonpoint Source
TMDL End Point:	DERIVED FROM STATE OF TENNESSEE WATER QUALITY STANDARDS, CHAPTER 1200-4-3, GENERAL WATER QUALITY CRITERIA, JANUARY, 2004: THE PH VALUE SHALL LIE WITHIN THE RANGE OF 6.0 TO 9.0 AND SHALL NOT FLUCTUATE MORE THAN 1.0 UNIT IN THIS RANGE OVER A PERIOD OF 24 HOURS. NET ALKALINITY WAS USED AS A SURROGATE FOR PH. THE NET ALKALINITY TMDL FOR IMPAIRED WATERBODIES IN THE BEAR CREEK SUBWATERSHED WAS DEVELOPED USING A LOAD DURATION CURVE METHODOLOGY TO ASSURE COMPLIANCE WITH THE TARGET NET ALKALINITY OF 10.8 MG/L, WHICH WILL PROVIDE A PH WITHIN THE CRITERIA RANGE OF 6.0 ¿ 9.0. A DURATION CURVE IS A CUMULATIVE FREQUENCY GRAPH THAT REPRESENTS THE PERCENTAGE OF TIME DURING WHICH THE VALUE OF A GIVEN PARAMETER IS EQUALED OR EXCEEDED. LOAD DURATION CURVES ARE DEVELOPED FROM FLOW DURATION CURVES AND CAN ILLUSTRATE EXISTING WATER QUALITY CONDITIONS (AS REPRESENTED BY LOADS CALCULATED FROM MONITORING DATA), HOW THESE CONDITIONS COMPARE TO DESIRED TARGETS, AND THE REGION OF THE WATERBODY FLOW REGIME REPRESENTED BY THESE EXISTING LOADS.

Listed Water Causes of Impairment for Ph Click on the underlined Waterbody ID for a Waterbody Report. Click on the underlined "Waterbody Map" literal for a map of the Assessment Unit.
Waterbody ID	Waterbody Name	Map	Cycles Listed	Cause(s) of Impairment Addressed
TN05130104050_0100	East Branch Bear Creek	Waterbody Map	2002, 2004, 2006	pH
TN05130104050_1000	Bear Creek	Waterbody Map	2002, 2004, 2006	pH

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