I cannot find where to clear log data in admin section of magento 2.0 - any suggestions on where to find?
You mean Admin Actions Log?
Magento 2.0 CE doesn't support this feature. If using Magento 2 EE, you find 2 tables: magento_logging_event and magento_logging_event_changes. You can see Admin Actions Log. Only truncate magento_logging_event that will clear Admin Actions Log.