The depot is subject to external regulatory oversight by the EPA. If the depot becomes unsafe, the EPA will close it. Therefore, the continuity of depot business operations requires depot safety. To further enhance depot safety, the depot governance has established additional policies regarding depot operations.

Depot safety has specific measurable physical criteria, constraints on the storage of hazardous chemicals that must be met to remain in compliance with EPA regulations.

Likewise, depot vulnerability has specific measurable physical criteria defined by the depot governance officers.

A depot manager must monitor the depot and ensure its safety. The system must help the depot manager fulfill this responsibility by reportng the depot status in detail.

To ensure depot safety, the system needs to know which hazard types each storage building has been licensed to store. To minimize depot vulnerability, the system needs to know which buildings are neighbors. Thus, the system needs a map of the depot and a storage license inventory. A depot manager is responsible for supplying this information.

To ensure depot safety, a depot manager must supply the system with accurate information about the depot buildings, including their locations and physical dimensions.

To ensure depot safety, a depot manager must supply the system with accurate information about building storage licenses.

The loading bay is a special kind of storage building. Unlike other storage buildings, it has licenses for all hazard types. However, it must still remain in compliance with the EPA regulations regarding the combined storage of hazard types 1 and 2. To ensure depot safety, a loading bay clerk must only accept a drum delivery when the loading bay is empty. When a delivery truck arrives at the (empty) loading bay, the loading bay clerk initiates a drum delivery.

A delivery manifest accompanies each delivered drum load. The delivery manifest serves as a check against the drums contained in a delivered drum load. The system accepts a delivery manifest from a loading bay clerk and uses it to verify against the drums received by the loading bay clerk.

To ensure depot safety, the system tracks and maintains a record of every drum that passes through the depot. To facilitate drum location, the system assigns a unique identifier to each drum. Also, a loading bay clerk labels each drum with the assigned drum identifier. As each drum is processed, the system indicates to the loading bay clerk whether the drum was accepted or must be returned to the truck.

A loading bay clerk notifies the system when she has finished drum delivery checkin. The system then produces a returned drum report, a delivery discrepancy report, and a drum allocation report. A drum handler uses the returned drum report to reload the truck with any returned drums. A drum handler uses the drum allocation report to distribute the retained drums to their assigned storage buildings.

To ensure depot safety, a loading bay clerk must only accept a drum delivery when the loading bay is empty. When a truck arrives at the (empty) loading bay to collect a drum load, the loading bay clerk initiates a collection and enters a collection order into the system. The system responds with a drum collection manifest that indicates which drums to collect from their assigned storage buildings. A drum handler collects the drums and delivers them to the loading bay for check out and subsequent loading onto the collection truck.

To ensure depot safety, the system tracks every drum retained by the depot. To maintain accurate depot records, a loading bay clerk must check each collected drum out of inventory using their system assigned drum identifiers.

A loading bay clerk notifies the system when she has finished drum collection checkout. The system then produces a delivery manifest to accompany the collected drum load. A drum handler then loads the collected drums onto the collection truck.

To ensure depot safety, the system maintains an accurate drum inventory. The system knows which drums are assigned to each storage building, which buildings are licensed to store each hazard type, and where the buildings are located in the depot. The system uses this knowledge to safely assign storage space during drum delivery. The system also minimizes depot vulnerabilities during both drum delivery and drum collection.