Water Quality Awareness 101 20 | P a g e  Physical and electronic barriers created in series to protect downstream settings as a result of an inadvertent change  Hardwired chemical maximum dosing set points  Log off requirement when system is not in use Login/password required to access any plant control 13. SUPPLY CHAIN AND STORAGE  Plumbers or any person who stores items for use in a drinking water system  Water utility asset managers  Water utility distribution system workers  Any person who is installing or replacing items on drinking water assets It would be reasonable to assume that an item that has been stored on the shelf and is suitably sealed would be clean enough for immediate use. However, we do not always know the history of the item, where it was stored or if it has been repackaged at some point.