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

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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

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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

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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 Cadmium 0.22390 9 1 0.8367

• 3.56

0.6247

• 3.344

1.01133 7 0.976337 na na

20

Lead 0.54096 8 1 1.273

• 1.46

1.273

• 4.705

0.99300 1 0.99300 1 na na 25 Zinc 36.4978 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

• rganisms from ac

acute toxicity

Metal CMC WER mA bA mc bc Acute Chronic C1 C2 hardness calc mg/L Cadmium 0.352679 1 0.8367

• 3.56

0.6247

• 3.344 1.011337 0.976337

na na

20

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

𝐷𝑁𝐷 = 𝑋𝐹𝑆 × 𝑓(𝑛𝐵×ln ℎ𝑏𝑠𝑒𝑜𝑓𝑡𝑡 +𝑐𝐵)× 𝐵𝑑𝑣𝑢𝑓 𝐷𝑝𝑜𝑤𝑓𝑠𝑡𝑗𝑝𝑜 𝐺𝑏𝑑𝑢𝑝𝑠

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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

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0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 5 10 15 20 25 30 35 40 45 50 Critie ieria ia (ug/L) hardne ness (mg/L) L)

Cadmium mium Cri riteria

Cd CMC Cd CCC

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 10 20 30 40 50 Critie ieria ia (ug/L) hardnes ness (mg/L)

Cadmi mium um Criteria

Cd CMC Cd CCC 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 20 40 60 Critie ieria ia (ug/L) hardnes ness (mg/L)

Zinc Cri riteria eria

Zn CMC Zn CCC 0.00 5.00 10.00 15.00 20.00 25.00 30.00 0.00 5.00 10.00 15.00 20.00 25.00 30.00 20 40 60 Critie ieria ia (ug/L) hardne ness (mg/L) L)

Lead Criteria eria (CCC C on right t axis) s)

Pb CMC Pb CCC

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0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 20 40 60 Criti tieri eria a (ug ug/L /L) hardness dness (mg/L /L as CaCO3)

Zinc Crit iteria eria

Zn CMC Zn CCC

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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

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