[ ] There are several instances where the max date is NA, but the older data is good, so we need to make this more dynamic (maybe an if na type statement).
[ ] ALSO some cases where the later date is BDL, so will need to filter for that to the earlier date as well
https://github.com/COMPASS-DOE/EXCHANGE/blob/31b342829cc401f1ac7400fba14f9a051054fdc9/Processing_Scripts/water_ions.R#L477
@kaizadp