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The ABCs of TMDLs for Stakeholders Bruce Zander, EPA 28 September 2005 Webcast

The ABCs of TMDLs for Stakeholders Bruce Zander, EPA 28 September 2005 Webcast. Agenda. Review the parts and pieces of the TMDL* program Understand terminology View some case examples Understand how TMDLs can be you friend in the water quality business.

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The ABCs of TMDLs for Stakeholders Bruce Zander, EPA 28 September 2005 Webcast

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  1. The ABCs of TMDLs for Stakeholders Bruce Zander, EPA 28 September 2005 Webcast

  2. Agenda • Review the parts and pieces of the TMDL* program • Understand terminology • View some case examples • Understand how TMDLs can be • you friend in the water quality • business. * TMDL = total maximum daily load 2

  3. Agenda • Review the parts and pieces of the TMDL program • Understand terminology • View some case examples • Understand how TMDLs can be • you friend in the water quality • business. 3

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  28. Clean Water Act Maze TMDL 28

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  30. Water Quality Controls in the Clean Water Act • Technology-based controls • Water quality-based controls 30

  31. Water Quality Controls in the Clean Water Act • Technology-based controls (point sources) • Water quality-based controls 31

  32. Water Quality Controls in the Clean Water Act • Technology-based controls (point sources) • Water quality-based controls (point sources • & nonpoint sources) 32

  33. Water Quality Controls in the Clean Water Act • Technology-based controls(point sources) • Water quality-based controls (point sources • & nonpoint sources) TMDL agenda 33

  34. Questions? 34

  35. TMDL Definition • The amount of a specific pollutant that a • waterbody can receive and still meet water quality standards. • A TMDL is made up of the sum of all the • point source loads ("wasteload allocation") • and load associated with nonpoint sources • and background sources ("load allocation"). TMDLs must include a margin of safety (explicit or implicit) and consider seasonal variations. 35

  36. TMDL Definition jWLA + jLA+ {MOS} = TMDL WLA = wasteload allocation (point source loads) LA = load allocation (nonpoint source and background loads) MOS = margin of safety (explicit or implicit) TMDL = total maximum daily load

  37. Wasteload Allocation Components non-stormwater point sources nonpoint source stormwater point source background irrigated ag return flow & ag stormwater groundwater inflow atmospheric deposition diffuse runoff Load Allocation Components 37

  38. Water Quality Standards [Ref: 40 C.F.R. 130.7(b)(3)] use classifications (e.g., aquatic life, irrigation, drinking water, recreation) numeric standards (e.g., 5.0 mg/l dissolved oxygen with corresponding averaging period and exceedence frequency) narrative standards (e.g., "free from toxics") antidegradation provisions 38

  39. Clean Water Act TMDL Requirements in Section 303(d) • identify impaired/threatened waterbodies • develop TMDLs for those waters 39

  40. 303(d) Waterbody List Clean Water Act TMDL Requirements in Section 303(d) • identify impaired/threatened waterbodies • develop TMDLs for those waters 40

  41. Colorado 303(d) Waterbody List Excerpt: Upper Colorado Basin Priority medium medium medium high medium low low low medium low medium • Waterbody • Blue River (French Gul. to Swan R.) • Snake River (below Peru Creek) • Peru Creek • French Gulch (1.5 mile below Lincoln • to mouth) • Straight Creek • Eagle River (Belden to Gore Creek) • Cross Creek (lower portion near mouth) • Eagle River (Gore Cr. to Colorado R.) • Coal Creek • Unnamed Trib in Willow Cr. watershed • Williams Fork River Pollutants Cadmium, Zinc Cadmium, Zinc, Lead, Manganese, Copper Cadmium, Copper, Manganese pH, Cadmium, Zinc Sediment Cadmium, Manganese, Zinc Cadmium, Manganese, Zinc Manganese Iron Ammonia, Manganese 41

  42. Colorado 303(d) Waterbody List Excerpt: Upper Colorado Basin Due April 1 (Every 2years) Priority medium medium medium high medium low low low medium low medium • Waterbody • Blue River (French Gul. to Swan R.) • Snake River (below Peru Creek) • Peru Creek • French Gulch (1.5 mile below Lincoln • to mouth) • Straight Creek • Eagle River (Belden to Gore Creek) • Cross Creek (lower portion near mouth) • Eagle River (Gore Cr. to Colorado R.) • Coal Creek • Unnamed Trib in Willow Cr. watershed • Williams Fork River Pollutants Cadmium, Zinc Cadmium, Zinc, Lead, Manganese, Copper Cadmium, Copper, Manganese pH, Cadmium, Zinc Sediment Cadmium, Manganese, Zinc Cadmium, Manganese, Zinc Manganese Iron Ammonia, Manganese 42

  43. Clean Water Act TMDL Requirements in Section 303(d) • identify impaired/threatened waterbodies • develop TMDLs for those waters 43

  44. 303(c) Water Quality Standards • States/Tribes* • establish • EPA reviews • & approves • EPA has authority • to promulgate * Authorized Tribes 44

  45. 303(c) 303(d) Water Quality Standards TMDLs • States/Tribes * • establish • EPA reviews • & approves • EPA has authority • to establish • States/Tribes* • establish • EPA reviews • & approves • EPA has authority • to promulgate * Authorized Tribes 45

  46. 303(c) 303(d) 303(e) Water Quality Standards Water Quality Controls* TMDLs • States/Tribes • establish • EPA reviews • & approves • EPA has authority • to establish • Point Source NPDES permits • Nonpoint management practices • - - - • - - - • States/Tribes • establish • EPA reviews • & approves • EPA has authority • to promulgate * Water quality controls include regulatory as well as voluntary controls 46

  47. Water Quality-Based Approach Assess waters based on WQ standards Implement water quality controls Identify impaired/threatened waters (303(d) List) Develop TMDLs 47

  48. Questions? 48

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