Minimum sample count & protocol to address variability Pb release under Section 8 Peter Greiner, NSF International DWAJC Meeting - December, 2013 Tab 8:

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Presentation transcript:

Minimum sample count & protocol to address variability Pb release under Section 8 Peter Greiner, NSF International DWAJC Meeting - December, 2013 Tab 8: DWA

Variability WaterRF #4243 recommendation: NSF 61 would be improved by mandating a sample size greater than 1 when evaluating lead release from in-line devices containing brass or bronze materials. NSF Std 61 JC action: Assigned task group to address ___________________________ [WaterRF #4243: “Is NSF 61 Relevant for Chloraminating Utilities”] Tab 8: DWA

Variability Tab 8: DWA Protocol Current Section 8 protocol, Section 9 like protocol, Or new protocol

Variability Tab 8: DWA Protocol Current Section 8 protocol, Section 9 like protocol, Or New protocol

Variability Tab 8: DWA Protocol Current Section 8 protocol, Section 9 like protocol, Or New protocol Sample count (If <15 kg (33 lbs) and holds < 2 liters) Minimum 3, additional possible if requested by manufacturer

Variability Tab 8: DWA Protocol Current Section 8 protocol, Section 9 like protocol, Or New protocol Sample count (If <15 kg (33 lbs) and holds < 2 liters) Minimum 3, additional possible if requested by manufacturer Evaluation of samples When evaluated individually; Arithmetic mean < 5ppb Individual samples must not exceed 15 ppb If 3, can pool waters. Result must be < 5 ppb.

Thanks…! Pete Greiner