Dissolved Oxygen TMDL TWG 1 11192015
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View “Slide Master” To Change Heading Mid Coast Dissolved Oxygen TMDL KickKick--OffOff Meeting Dan Sobota Oregon Department of Environmental Quality First Technical Workgroup Meeting November 19, 2015 Newport, Oregon View “Slide Master” To Change My backgroundHeading • Academic training: – Undergraduate degree from Virginia Tech in Biology – Master’s and PhD in Fisheries Science with a concentration in Stream Ecology from Oregon State – Worked on projects involving large wood inputs, ecosystem metabolism, and nitrogen cycling in Pacific Northwest streams • Postdocs at Washington State University and the US EPA working on watershed nutrient cycling • With Oregon DEQ since March 2014 • Have spent a lot of time in the Mid Coast fishing, hunting, mushroom picking, & hiking (including last weekend, when I got drenched in Drift Creek-Siletz) “Somewhere” in the Siletz Gorge Slide 2 View “Slide Master” To Change Meeting ObjectivesHeading Slide 3 View “Slide Master” To Change Meeting ObjectivesHeading • Review scope & concepts for DO technical work Slide 4 View “Slide Master” To Change Meeting ObjectivesHeading • Review scope & concepts for DO technical work • Review DO status in Mid Coast rivers Slide 5 View “Slide Master” To Change Meeting ObjectivesHeading • Review scope & concepts for DO technical work • Review DO status in Mid Coast rivers • Provide overview of proposed approach & focus areas Slide 6 View “Slide Master” To Change Meeting ObjectivesHeading • Review scope & concepts for DO technical work • Review DO status in Mid Coast rivers • Provide overview of proposed approach & focus areas • Provide preliminary analysis & propose next steps Slide 7 View “Slide Master” To Change Heading Scope & context for DO technical work Slide 8 View “Slide Master” To Change Total MaximumHeading Daily Load (TMDL) Slide 9 View “Slide Master” To Change Total MaximumHeading Daily Load (TMDL) • Pollution a waterbody can receive before impairment Slide 10 View “Slide Master” To Change Total MaximumHeading Daily Load (TMDL) • Pollution a waterbody can receive before impairment • Required when a water quality standard exceeded Slide 11 View “Slide Master” To Change TMDL equationHeading TMDL = LA + WLA + MOS + RC • LA: Load Allocation (nonpoint sources) • WLA: Waste Load Allocation (point sources) • MOS: Margin of Safety (account for uncertainty) • RC: Reserve Capacity (set aside for future development) Slide 12 View “Slide Master” To Change TMDL processHeading Identify Exceedances (prior to TMDL) View “Slide Master” To Change TMDL processHeading Develop TMDL Identify Exceedances (prior to TMDL) View “Slide Master” To Change TMDL processHeading Develop Water Quality Management Plan (WQMP) Develop TMDL DMA Implementation Plan Identify Waste Load & Exceedances Load (prior to TMDL) Allocations View “Slide Master” To Change TMDL processHeading Implement TMDL and WQMP Develop Water Quality Management Plan (WQMP) Develop TMDL DMA Implementation Plan Identify Waste Load & Exceedances Load (prior to TMDL) Allocations View “Slide Master” To Change TMDL processHeading Implement TMDL and WQMP Develop Water Quality Management Plan (WQMP) Develop TMDL DMA Implementation Plan Identify Waste Load & Exceedances Load (prior to TMDL) Allocations View “Slide Master” To Change TWG scopeHeading & expectations Photo by Russ George Photo by Bonnie Lamb Slide 18 View “Slide Master” To Change TWG scopeHeading & expectations • Goal : DEQ partners with stakeholders for advice on TMDL development and implementation including: –Documenting local knowledge to identify sources –Gaining information on land use conditions –Documenting management actions (past, current, planned) and other relevant activities –Development of alternatives and identification of a preferred solution Adapted from the International AssociationPhoto by for Russ Public George ParticipationPhoto by - Bonnie http://www.iap2.org/ Lamb Slide 19 View “Slide Master” To Change TWG scopeHeading & expectations • Goal : DEQ partners with stakeholders for advice on TMDL development and implementation including: –Documenting local knowledge to identify sources –Gaining information on land use conditions –Documenting management actions (past, current, planned) and other relevant activities –Development of alternatives and identification of a preferred solution • Your part: We (DEQ) will look to you for advice and innovation in formulating solutions and incorporate your advice and recommendations into our decisions to the maximum extent possible Adapted from the International AssociationPhoto by for Russ Public George ParticipationPhoto by - Bonnie http://www.iap2.org/ Lamb Slide 20 View “Slide Master” To Change DissolvedHeading oxygen concepts Slide 21 View “Slide Master” To Change DO in riversHeading and streams • A fundamental water quality parameter • Essential to metabolism of aerobic organisms • Influences solubility of nutrients, metals, and metalloids Photo by Russ George Photo by Bonnie Lamb Slide 22 Overview Viewof state “Slide criteria Master” for To DO Change in rivers and streams Heading Class Minimum Primary use/level of protection Criteria Spawning ≥ 11.0 mg/L or ≥ Salmonid spawning and incubation of 95% saturation embryos until emergence from the gravels Cold Water ≥ 8.0 mg/L or ≥ Salmon, trout, cold-water invertebrates, and 90% saturation other native cold-water species exist throughout all or most of the year. Cool Water ≥ 6.5 mg/L Mixed native cool-water aquatic life, such as sculpins, smelt, and lampreys. Includes estuaries. Warm Water ≥ 5.5 mg/L Introduced or native warm-water species. No risk No change from Marine waters and waters in wilderness background areas OAR 340-041-0016 Slide 23 Overview Viewof state “Slide criteria Master” for To DO Change in rivers and streams Heading Class Minimum Primary use/level of protection Criteria Spawning ≥ 11.0 mg/L or ≥ Salmonid spawning and incubation of 95% saturation embryos until emergence from the gravels Cold Water ≥ 8.0 mg/L or ≥ Salmon, trout, cold-water invertebrates, and 90% saturation other native cold-water species exist throughout all or most of the year. Cool Water ≥ 6.5 mg/L Mixed native cool-water aquatic life, such as sculpins, smelt, and lampreys. Includes estuaries. Warm Water ≥ 5.5 mg/L Introduced or native warm-water species. No risk No change from Marine waters and waters in Wilderness background areas. OAR 340-041-0016 Slide 24 View “Slide Master” To Change Heading Why are criteria “either or”? Theoretical 100% saturation curves 13 Sea level 11 300 m elevation DissolvedDissolved(mg/L) (mg/L) OxygenOxygen 9 0 5 10 15 20 25 Temperature (°C) http://water.usgs.gov/software/DOTABLES/ Slide 25 View “Slide Master” To Change ConceptualHeading model – natural waters Water column Dissolved Oxygen Benthos/ Hyporheic zone Slide 26 View “Slide Master” To Change ConceptualHeading model – natural waters Atmospheric Oxygen Air-water exchange rate (K) Water column Dissolved Oxygen Benthos/ Hyporheic zone Slide 27 View “Slide Master” To Change What influencesHeading air-water exchange rate? • Increases with temperature Atmospheric Oxygen • Decreases with barometric Air-water exchange rate (K) pressure (elevation) Water column Dissolved Oxygen • Increases with channel roughness & slope Benthos/ Hyporheic zone Slide 28 View “Slide Master” To Change ConceptualHeading model – natural waters Atmospheric Oxygen Air-water exchange rate (K) Water column Dissolved Oxygen Gross primary production (GPP) Benthos/ Hyporheic zone Slide 29 View “Slide Master” To Change What influencesHeading gross primary production (GPP)? • Increases with temperature • Increases with light Water column • Increases with nutrients Dissolved Oxygen Gross primary production (GPP) Benthos/ Hyporheic zone Slide 30 View “Slide Master” To Change ConceptualHeading model – natural waters Atmospheric Oxygen Air-water exchange rate (K) Water column Dissolved Oxygen Gross primary production (GPP) Autotrophic respiration Benthos/ Hyporheic zone Slide 31 View “Slide Master” To Change ConceptualHeading model – natural waters Atmospheric Oxygen Air-water exchange rate (K) Water column Dissolved Oxygen Gross primary production (GPP) Dissolved Autotrophic Heterotrophic organic carbon respiration respiration Benthos/ Particulate Hyporheic zone organic carbon Slide 32 View “Slide Master” To Change ConceptualHeading model – natural waters Atmospheric Oxygen Air-water exchange rate (K) Water column Dissolved Oxygen Gross primary production (GPP) Dissolved Autotrophic Heterotrophic organic carbon respiration respiration Benthos/ Ecosystem respiration (ER) Particulate Hyporheic zone organic carbon Slide 33 View “Slide Master” To Change What influencesHeading Ecosystem Respiration (ER)? • Increases with temperature • Increases with GPP Water column • Increases with nutrients Dissolved Oxygen Dissolved Autotrophic Heterotrophic organic carbon respiration respiration • Increases with organic Benthos/ Ecosystem respiration (ER) Particulate organic Hyporheic zone matter standing stock carbon Slide 34 View “Slide Master” To Change ConceptualHeading model – natural waters Atmospheric Oxygen Atmospheric Oxygen Air-water exchange rate (K) Atmospheric Oxygen Air-water exchange rate (K) Water Air-water exchange rate (K) column Water Dissolved column Oxygen Water Gross primary Dissolved column production Oxygen (GPP) Dissolved Autotrophic Heterotrophic organic carbon Gross primary Dissolved respiration respiration production Oxygen (GPP) Dissolved Autotrophic Heterotrophic organic carbon Gross primary respiration