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Water Quality Standards at Caddo Lake Environmental Flows Workshop Planning Meeting May 2007.

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Presentation on theme: "Water Quality Standards at Caddo Lake Environmental Flows Workshop Planning Meeting May 2007."— Presentation transcript:

1 Water Quality Standards at Caddo Lake Environmental Flows Workshop Planning Meeting May 2007

2 Two Recent Proposals 1. Proposal to change the segments and related pH issues 2. Delisting or Downgrading - TCEQ proposed changes to 303(d) listings for segments 401, 402, and 407

3 Current Segments Map will go here.

4 Proposal to change segments and related pH issues Arthur Crowe to Caddo Lake Institute on March, (abbreviated) Arthur Crowe to Caddo Lake Institute on March, (abbreviated) TCEQ staff would like to offer several ideas for discussion regarding Caddo Lake during the current triennial standards review: 1. Change the boundary description between 0401 and 0402 to read the intersection of Big Cypress Bayou and Government Ditch in the Devils Elbow area. This is a clearer description than the current boundary which is a certain distance downstream of SH43 2. Divide segment 0401 into two separate segments with the upper area referred to as The Caddo Swamp (see next slide). The two areas are different physically and hydrologically. 3. The Caddo Swamp to have different pH standard ( S.U.) than that of the main lake ( S.U.). We are also considering lowering pH standards for some other streams in the Cypress Basin that we feel are the result of natural conditions…

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6 Delisting/Downgrading Draft 2006 Texas Water Bodies and Parameters Removed from the 303(d) List (March 19, 2007) Draft 2006 Texas Water Bodies and Parameters Removed from the 303(d) List (March 19, 2007) Caddo Lake (401) Caddo Lake (401) Big Cypress Below Lake O the Pines (402) Big Cypress Below Lake O the Pines (402) James Bayou (407) James Bayou (407) Little Cypress Bayou (Creek) (409) Little Cypress Bayou (Creek) (409)

7 Caddo Lake (Segment 401) Current Listed Impairment – Depressed Dissolved Oxygen Current Listed Impairment – Depressed Dissolved Oxygen Current Listed Impairment Category – 5c Current Listed Impairment Category – 5c The water body does not meet applicable water quality standards or is threatened for one or more designated uses by one or more pollutants The water body does not meet applicable water quality standards or is threatened for one or more designated uses by one or more pollutants Additional data and information will be collected before a TMDL is scheduled Additional data and information will be collected before a TMDL is scheduled

8 Caddo Lake (Segment 401) Reason for delisting – Pollution Reason for delisting – Pollution This impairment is not caused by a pollutant load that can be allocated and controlled with a TMDL. This impairment has been moved to a category 4c. This impairment is not caused by a pollutant load that can be allocated and controlled with a TMDL. This impairment has been moved to a category 4c. Additional Information Additional Information The seasonal low dissolved oxygen condition in this portion of the lake is due to natural conditions with trees, wind protection, little water movement, and warm temperatures. A TMDL would not be a useful water quality planning strategy… The seasonal low dissolved oxygen condition in this portion of the lake is due to natural conditions with trees, wind protection, little water movement, and warm temperatures. A TMDL would not be a useful water quality planning strategy…

9 Big Cypress (Segment 402) Current Impairment 1 – Depressed Dissolved Oxygen Current Impairment 1 – Depressed Dissolved Oxygen Current Listed Category – 5c Current Listed Category – 5c The water body does not meet applicable water quality standards or is threatened for one or more designated uses by one or more pollutants. The water body does not meet applicable water quality standards or is threatened for one or more designated uses by one or more pollutants. Additional data and information will be collected before a TMDL is scheduled. Additional data and information will be collected before a TMDL is scheduled. Current Impairment 2 – Lead in Water Current Impairment 2 – Lead in Water Current Listed Category – 5c (see above) Current Listed Category – 5c (see above)

10 Big Cypress (Segment 402) Reason for Delisting – MEETS Reason for Delisting – MEETS The most recent set of data demonstrates that water quality standards are now met and water quality meets the requirements for delisting The most recent set of data demonstrates that water quality standards are now met and water quality meets the requirements for delisting For both impairments 1 and 2 For both impairments 1 and 2

11 James Bayou (Segment 407) Current Impairment – Copper in Bayou Current Impairment – Copper in Bayou Current Category – 5c Current Category – 5c The water body does not meet applicable water quality standards or is threatened for one or more designated uses by one or more pollutants The water body does not meet applicable water quality standards or is threatened for one or more designated uses by one or more pollutants A review of the water quality standards will be conducted before a TMDL is scheduled A review of the water quality standards will be conducted before a TMDL is scheduled Reason for Delisting – MEETS Reason for Delisting – MEETS The most recent set of data demonstrates that water quality standards are now met and water quality meets the requirements for delisting The most recent set of data demonstrates that water quality standards are now met and water quality meets the requirements for delisting

12 Little Cypress (Segment 409) Current Listed Impairments – Depressed Dissolved Oxygen and Bacteria Current Listed Impairments – Depressed Dissolved Oxygen and Bacteria Current Listed Impairment Category – 5c Current Listed Impairment Category – 5c The water body does not meet applicable water quality standards or is threatened for one or more designated uses by one or more pollutants The water body does not meet applicable water quality standards or is threatened for one or more designated uses by one or more pollutants Additional data and information will be collected before a TMDL is scheduled Additional data and information will be collected before a TMDL is scheduled No proposal to change this listing No proposal to change this listing


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