Frequent Questions

When creating a composite source water sample from multiple sources, assuming a blended tap is not available, what volumes must be collected from each source? Also, what should the total composite sample volume be?

When creating a composite sample, the system should collect the volume contributed from each source based on the proportion of flow that the sources contributed to the plant on the day of the sampling.  The total sample volume for a composite sample is the same as for any sample: 10 L sample volume or 2 L packed pellet volume. 

For additional guidance on the Long Term 2 Enhanced Surface Water Treatment Rule please visit http://water.epa.gov/lawsregs/rulesregs/sdwa/lt2/index.cfm.

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