ENMODS contains many variables and parameters. They have a reference list for these variables online: https://www2.gov.bc.ca/gov/content/environment/research-monitoring-reporting/monitoring/environmental-monitoring-data-system#resources
renmods adds a couple of extra variables created from the data.
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filename- This is the original file name and location of the downloaded data -
ren_date- This is the local Date drawn from theObserved_Date_Timecolumn -
tz- This is the original timezone of the data, retrieved fromObserved_Date_Timebefore it was converted to UTC-7:00.