Utah's Approach to New Water Quality Criteria for Ammonia
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Utah's Approach to New Water Quality Criteria for Ammonia, published by the Utah Division of Water Quality. For more information, please visit waterquality.utah.gov
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Utah's Approach to New Water Quality Criteria for Ammonia
- 1. Utah’s Approach to New WQ Criteria for Ammonia Utah Division of Water Quality Water Quality Standards Workgroup July 21, 2014
- 2. Slide 2 Utah’s Approach Receiving Waters with Current UPDES permits Evaluate whether new ammonia criteria would be exceeded (informational only) Phase I: Determine whether sensitive species are present (genus level) Present – adopt new ammonia criteria Not present – discuss phase 2 research to determine if present historically Historical presence or probability of occurrence using spatial statistical models; Potential teaming with other states Non-Receiving Waters Evaluate whether new ammonia criteria would be exceeded (informational only) Adopt new ammonia criteria New UPDES permitees could do research in support of site- specific standard when/if necessary Scoping Recalculation scenarios for presence/absence of sensitive species Presence of families with sensitive species using existing data Potential impacts on POTWs
- 3. Slide 3 Recalculated Acute Ammonia Criteria Scenarios Criteria1 (mg TAN/L) Final Acute Value (mg TAN/L) Scenario Species Used for Final Acute Value 17 33.85 Sensitive mussels and snails present and salmonids absent per USEPA (2013) 24 48 Salmonids and snails present and sensitive mussels absent per USEPA (2013) 29 58.43 Salmonids and sensitive snails present but no sensitive mussels2 Golden Shiner, Pebblesnail, Lost River sucker, Mountain whitefish 30 60.23 Salmonids present but no sensitive mussels or snails2 Shortnose sucker, Golden Shiner, Lost River sucker, Mountain whitefish 38 74 Snails present but no sensitive mussels or salmonids per USEPA (2013) 2These were recalculated by DWQ by backing out the described species to show the potential impact of sensitive snails on the ammonia criterion. The difference observed between the values provided in the USEPA criteria document and these recalculated values requires further evaluation. The recalculations assume 7 pH and 20o C and that all genus mean acute values are above the 5th percentile 1Current acute standard is 24 mg/L at 7 pH for Class 3A
- 4. Slide 4 2013 (new)maximum (acute) ammonia criteria compared to existing criteria at pH=7
- 5. Slide 5 2013 (new)maximum (acute) ammonia criteria compared to existing criteria at pH=7 and 8 0 1 2 3 4 5 6 7 8 9 10 10 15 20 25 30 AcuteCriteria(mg/l) Temperature (˚C) 2013, Sensitive species not present 2013, sensitive species present Existing, Classes 3B-3D Existing, Class 3A @pH=8
- 6. Slide 6 2013 (new)chronic ammonia criteria compared to existing criteria at pH=8 0 1 2 3 4 5 6 10 15 20 25 30 ChronicContinuousCriteria(mg/l) Temperature (˚C) 2013, sensitive species not present 2013, sensitive species present Existing, no early life stages present Existing, early life stages present
- 7. Slide 8 Gastropod families in Utah that include sensitive species Hydrobidae: mud snails/spring snails Valvatidae: valve snails Found in streams and lakes in northern Utah Ancylidae (tribe in family Planorbidae): snails/limpets
- 8. Slide 9 Bivalve families in Utah that include sensitive species Unionidae: mussels Corbiculidae: Asian clamsFound in streams and lakes in northern Utah Pisididae: pill clams Photo courtesy of CA Dept of Fish and Wildlife, Aquatic Bioassessment Laboratory Photo courtesy of CA Dept of Fish and Wildlife, Aquatic Bioassessment Laboratory
- 9. Slide 10 Utah’s Approach Receiving Waters with Current UPDES permits Evaluate whether new ammonia criteria would be exceeded (informational only) Phase I: Determine whether sensitive species are present (genus level) Present – adopt new ammonia criteria Not present – discuss phase 2 research to determine if present historically Historical presence or probability of occurrence using spatial statistical models; Potential teaming with other states Non-Receiving Waters Evaluate whether new ammonia criteria would be exceeded (informational only) Adopt new ammonia criteria New UPDES permitees could do research in support of site- specific standard when/if necessary Scoping Recalculation scenarios for presence/absence of sensitive species Presence of families with sensitive species using existing data Potential impacts on POTWs
- 10. Slide 11 Determining Presence of Sensitive Mollusks Species occur at site if… Are usually present at the site. Are present at the site only seasonally due to migration. Are present at the site intermittently because they periodically return to or extend their ranges into the site Were present at the site in the past, are not currently present at the site due to degraded conditions, but are expected to return to the site when conditions improve. Are these sensitive mollusks present today? Historical records Field surveys eDNA