What do I do if I want the design value to be calculated using a primary and composite primary sampler?

If the user wants to use data from both a primary sampler and a composite primary sampler to calculate the design value (DV), they need to go to Maintain -> Site -> Primary Monitor Period and ensure the primary monitor information is populated and ensure they insert a 'Y' in the Composite Sampler column.  If the user fails to add the 'Y' indicating there is a composite sampler then the AQS system will calculate the DV using only the primary sampler data.

The user must also ensure that the Method Code used by the samplers is "Intermittent" and not "Continuous".  Only if both samplers utilize an "Intermittent" method code can their data stream be combined.

An example of two primary samplers (one of which is collocated) running on a staggered 1-in-6 day schedule at a site rsulting in a 1-in-3 day sampling schedule.  The primary sampler will have an offset of 0 and the collocated sampler will have an offset greater than 0 (i.e. 1-in-6 frequency and an offset of 3).