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[DOC File]TIPS - California
https://info.5y1.org/calculating-90th-percentile-for-lead_1_2cbe06.html
Depending on the number of samples collected, there are different methods for obtaining the 90th percentile. For five sample results, take the two highest results, add them together and divide by two (averaging) to obtain the 90th percentile.
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[DOC File]Systems serving 101-500 population
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If you collect 5 samples, calculate your 90th percentile like this: Rank your samples in order of concentration (mg/L), starting from lowest to highest. Find the average of the two highest results by adding them together and dividing by 2. The resultant number is recorded for the 90th percentile. Sample Site # Sample results
excel calculate 90th percentile

[DOCX File]American Statistical Association (ASA)
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A: The rule states that if lead concentrations exceed 15 ppb “in more than 10% of customer taps sampled,” then action must be taken to control corrosion, and the public must be informed. From this, we see that the action level is compared with the 90th percentile of the data, since 10% of values fall above the 90th percentile by definition.
90th percentile formula

[DOC File]Lead and Copper Results Worksheet - California
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Determine the 90th percentile lead level by following the instructions given in Table 2. Write down the 90th percentile level for Lead = mg/L (AL = 0.015 mg/L) 4.
90th percentile calculator

[DOC File]Maryland Department of the Environment
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Calculating the 90th percentile: For lead and copper, list samples from the highest recorded value to the lowest recorded value. Starting from the bottom (lowest value) count up until the calculated number (# of samples analyzed x 0.9) is reached. The sample value in this number position is the 90th percentile.
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[DOCX File]The Lead and Copper Rule - Utah
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Calculating Compliance. Sample results are evaluated against an action level. The lead action level is exceeded if the concentration in more than 10% of samples is greater than 0.015 mg/L (i.e. the 90th percentile lead level is greater than 0.015 mg/L). The copper action level is exceeded if the concentration in more than 10% of samples is ...
how to find 90th percentile

Calculating 90th percentile for lead