Cadm admium, ium, Le Lead ad an and d Zi Zinc c TM TMDL DL - PowerPoint PPT Presentation

Spo pokane ane Ri River er Cadm admium, ium, Le Lead ad an and d Zi Zinc c TM TMDL DL Idaho ho Water er Qu Quality lity St Stand ndar ards ds Spok okane e Ri River er Metals als TMDL MDL WAG G meeting ting By: y: Rober bert t St Stee eed, IDEQ , Surface ace Water er Ecolo ologi gist st April il 5, 2016

Water Quality Criteria • Except for cadmium, Idaho’s Water Quality Standards for aquatic life for metals are the same as the national recommended aquatic life criteria for metals. • Idaho’s aquatic life criteria for lead, cadmium, and zinc are expressed as a function of total hardness (mg/L as calcium carbonate), the metal’s water effect ratio (WER), and multiplied by an appropriate dissolved conversion factor http://adminrules.idaho.gov/rules/current/58/0102.pdf 2

Criterion Continuous Concentration (CCC) • 4-day average concentration of a toxic substance to ensure adequate protection of sensitive species of aquatic organisms from chro roni nic toxicity 𝐷𝐷𝐷 = 𝑋𝐹𝑆 × 𝑓 (𝑛𝑑×ln ℎ𝑏𝑠𝑒𝑜𝑓𝑡𝑡 +𝑐𝑑) × 𝐷ℎ𝑠𝑝𝑜𝑗𝑑 𝐷𝑝𝑜𝑤𝑓𝑠𝑡𝑗𝑝𝑜 𝐺𝑏𝑑𝑢𝑝𝑠 Metal CCC WER mA bA mc bc Acute Chronic C1 C2 hardness calc mg/L 0.22390 1.01133 20 Cadmium 9 1 0.8367 -3.56 0.6247 -3.344 7 0.976337 na na 0.54096 0.99300 0.99300 Lead 8 1 1.273 -1.46 1.273 -4.705 1 1 na na 25 36.4978 Zinc 9 1 0.8473 0.884 0.8473 0.884 0.978 0.986 7400 26000 25 3

Criterion Maximum Concentration (CMC) • the maximum instantaneous or 1-hour average concentration to protect aquatic organisms from ac acute toxicity 𝐷𝑁𝐷 = 𝑋𝐹𝑆 × 𝑓 (𝑛𝐵×ln ℎ𝑏𝑠𝑒𝑜𝑓𝑡𝑡 +𝑐𝐵) × 𝐵𝑑𝑣𝑢𝑓 𝐷𝑝𝑜𝑤𝑓𝑠𝑡𝑗𝑝𝑜 𝐺𝑏𝑑𝑢𝑝𝑠 Metal CMC WER mA bA mc bc Acute Chronic C1 C2 hardness calc mg/L 20 Cadmium 0.352679 1 0.8367 -3.56 0.6247 -3.344 1.011337 0.976337 na na Lead 13.88217 1 1.273 -1.46 1.273 -4.705 0.993001 0.993001 na na 25 Zinc 36.20177 1 0.8473 0.884 0.8473 0.884 0.978 0.986 7400 26000 25 4

Criteria Extra Goodies • Cannot exceed more than once every 3 years • The minimum hardness allowed for use in the equations is 25 mg/L for lead and zinc, and 10 mg/L for cadmium. • Numeric chemical standards can only be exceeded when flows are less than 5

Cadmium mium Cri riteria 0.80 0.70 0.60 0.50 ia (ug/L) 0.40 ieria Cd CMC Critie Cd CCC 0.30 0.20 0.10 0.00 0 5 10 15 20 25 30 35 40 45 50 hardne ness (mg/L) L)

Lead Criteria eria (CCC C on right t Cadmi mium um Criteria axis) s) 0.80 30.00 30.00 0.70 0.60 ia (ug/L) 0.50 25.00 25.00 0.40 ieria Cd CMC Critie 0.30 Cd CCC 0.20 0.10 20.00 20.00 0.00 0 10 20 30 40 50 ia (ug/L) hardnes ness (mg/L) 15.00 15.00 ieria Pb CMC Critie Zinc Cri riteria eria Pb CCC 70.00 10.00 10.00 60.00 50.00 ia (ug/L) 40.00 5.00 5.00 ieria Zn CMC 30.00 Critie Zn CCC 20.00 10.00 0.00 0.00 0 20 40 60 0.00 hardne ness (mg/L) L) 0 20 40 60 hardnes ness (mg/L) 7

Zinc Crit iteria eria 70.00 60.00 50.00 /L) ug/L a (ug 40.00 eria Zn CMC tieri 30.00 Zn CCC Criti 20.00 10.00 0.00 0 20 40 60 hardness dness (mg/L /L as CaCO 3 ) 8

Recent Changes to National Toxics Criteria • Also, the EPA don’t have a minimum hardness, whereas we do for all hardness-based. • EPA values came from here: https://www.epa.gov/wqc/national-recommended- water-quality-criteria-aquatic-life-criteria-table, with the exception of Cd, which was just released on Monday. Announcement is here: https://www.federalregister.gov/articles/2016/04/0 4/2016-07647/recommended-aquatic-life-ambient- water-quality-criteria-for-cadmium- 2016?utm_campaign=subscription+mailing+list&ut m_medium=email&utm_source=federalregister.gov 9

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