Description of each well interval.

This table stores the depths at which the various components of a well begin and end.  It is designed to contain a record for every segment of a well. The captured intervals include screens, seals, grout, blank casing, etc. ERPToolsX will not include WCI or WMI data in a submission unless there is WINT information that references the well or well segment.  A screened interval is defined as the area above the bottom of the screen segment up to the bottom of the next screen segment (or to the ground surface for the top screened interval).  A described interval is an interval that has a corresponding WINT record.