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TMDL Document for HENSON CREEK - MAINSTEM OF HENSON CREEK, INCLUDING ALL TRIBUTARIES AND WETLANDS, FROM THE SOURCE TO THE CONFLUENCE WITH THE LAKE FORK OF THE GUNNISON, EXCEPT FOR THE SPECIFIC LISTING IN SEGMENTS 31 AND 32.

TMDL ID: 38980 TMDL Name: HENSON CREEK - MAINSTEM OF HENSON CREEK, INCLUDING ALL TRIBUTARIES AND WETLANDS, FROM THE SOURCE TO THE CONFLUENCE WITH THE LAKE FORK OF THE GUNNISON, EXCEPT FOR THE SPECIFIC LISTING IN SEGMENTS 31 AND 32.
State/Tribe: Colorado TMDL Date: 07/29/2010
EPA Action: EPA Approved Comments: TMDL, LA, WLA, MOS REPORTED ARE LOWEST CALCULATED MONTHLY VALUES FOR FEBRUARY. MONTHLY LAS FOR PALMETTO GULCH ARE PROVIDED AS PART OF THE HENSON CREEK TMDL FOR SEVERAL MONTHS. SEE SUBMITTAL FOR OTHER MONTHLY VALUES.

No TMDL Documents have been uploaded for this TMDL.

TMDL Pollutant: Cadmium

Total Waste Load Allocation: .0121      Total Load Allocation: .0239
Explicit Margin Of Safety: .004 LBS/DAY      Implicit Margin Of Safety: N
Units for Total Waste Load Allocation and Total Load Allocation: LBS/DAY      TMDL Pollutant Source Type: Point/Nonpoint Source
TMDL End Point: CHRONIC CADMIUM HARDNESS-BASED TABLE VALUE STANDARDS WERE CALCULATED FOR EACH MONTH. A VALUE OF 0.40 UG/L FOR FEBRUARY WAS USED TO CALCULATE THE TMDL.

NPDES Allocation for Pollutant: Cadmium
NPDES ID Other Non PCS Identification Waste Load Allocation Units

Abandoned Mining Features
.0121
LBS/DAY


Listed Water Causes of Impairment for Cadmium
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
COGUUG30_6800 Henson Creek Waterbody Map 2008, 2010 Cadmium

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TMDL Pollutant: Zinc

Total Waste Load Allocation: 2.41      Total Load Allocation: 4.74
Explicit Margin Of Safety: .8 LBS/DAY      Implicit Margin Of Safety: N
Units for Total Waste Load Allocation and Total Load Allocation: LBS/DAY      TMDL Pollutant Source Type: Point/Nonpoint Source
TMDL End Point: MOTTLED SCULPIN-BASED ZINC STANDARDS WERE CALCULATED FOR EACH MONTH (HARDNESS DEPENDENT). A VALUE OF 81.8 UG/L FOR FEBRUARY WAS USED TO CALCULATE THE TMDL.

NPDES Allocation for Pollutant: Zinc
NPDES ID Other Non PCS Identification Waste Load Allocation Units

Abandoned Mining Features
2.41
LBS/DAY


Listed Water Causes of Impairment for Zinc
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
COGUUG30_6800 Henson Creek Waterbody Map 2008, 2010 Zinc

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