Logger Data is stored in the Logger_Events and Logger Data table.  The Logger Events stores information about the logger, such as Location (and Well if applicable), Equipment, Matrix being logged (ie water, air).  It references  the Locations table for information about the logger location (ie co-ordinates etc..), and the Wells table for information about the groundwater wells or screened intervals.

A number of reference tables are referred to, in particular the Matrix Types table, and the Chemistry Lookup table.

The key tables and relationships are shown below.