Using standard Windows features several electronic logbooks are installed at each site data acquisition computer. These logbooks are crucial to efficient operation and validation of daily data. All site activities are recorded in these logbooks. These include:

• method changes
• newcalibration standards
• instrument failures and corrective actions
• site visits for audits
• electronic visits via modem
• changes in computer configurations
• disk and file maintenance activities

In short, anything that occurs at the site may effect data validation and must be recorded in the logbooks. Electronic logbooks are archived on a nightly basis to insure integrity and allow data validators immediate access to important information regarding site specific activities which could affect data acquisition. They are setup for general site activities, method modification, calibration and computer reboot. They are directly available through user friendly icons and a site program group in the Windows program manager.

Fig 1: Site Logbooks used to record daily activities at Field Site