Mission and Policies

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.

safety	regulatory compliance
safe hazmat storage	ensure safety compliance
	minimize depot vulnerability
	prevent depot closure
	prevent litigation
	accept all drums that can be safely stored
	allocate drum storage space within licensed limits
	allocate drum storage space to minimize vulnerability

Depot Safety Compliance

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.

safety	regulatory compliance
unsafe storage building	= a building stores hazard type 1 and hazard type 2
safe storage building	= a building stores hazard type 3 and hazard type 1
	= a building stores hazard type 3 and hazard type 2

Depot Vulnerability

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

vulnerability	proximity, drum counts
vulnerable depot	= vulnerable storage building pair
vulnerable buildings	= neighboring pair of full storage buildings
neighboring buildings	= building walls within 5 meters proximity
full storage building	= (hazard type storage capacity = 0) per hazard type
hazard type storage capacity	= (drum storage limit – drum count) per hazard type
building drum storage limit	from: building drum storage license (per hazard type)
building drum count	from: building drum inventory

Depot Monitoring

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.

depot manager	monitors depot
depot manager	wants depot status
depot governors	want to ensure depot safety compliance
depot	remains safe
depot buildings	remain safe
depot manager	requests depot status report
system	reports depot status, including:
	a vulnerable building count
	a vulnerability indicator for each building
	a drum count per hazard for each building

Depot Map Maintenance

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.

depot manager	maintains depot map
depot manager	wants accurate depot map
depot governors	want to ensure depot safety compliance
depot map	reflects depot building characteristics and layout
depot manager	requests depot map maintenance
system	presents depot map maintenance operations
depot manager	selects a depot map maintenance operation

Depot Building Addition

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

depot manager	adds depot building
depot manager	wants accurate depot map
depot governors	want to ensure depot safety compliance
depot map	reflects depot building characteristics and layout
depot manager	selects add depot building
system	accepts building description, including:
	physical building location + dimensions
	building type: staff or storage
	drum licenses for a storage building
	actual drum count for a storage building
	occupant capacity for a staff building

Building License Addition

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

depot manager	adds storage building license
depot manager	wants accurate depot map
depot governors	want to ensure depot safety compliance
depot map	reflects storage building characteristics
depot manager	adds storage building license
system	accepts license information, including:
	licensed hazard type
	licensed drum count
	actual drum count

Drum Load Delivery

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.

depot	accepts a delivered drum load
loading bay clerk	wants to accept a delivered drum load
depot governors	want to ensure depot safety compliance
loading bay	was empty
delivery truck	arrived at the loading bay, and
drum handler	unloaded drums from a truck into the loading bay
loading bay clerk	selects drum load delivery
system	accepts delivery manifest for a drum load
	assigns drum ID and prints label for each accepted drum
loading bay clerk	notifies system when accepted drum labeling is finished
system	prints delivery reports
drum handler	reloads any returned drums onto the truck

Delivery Manifest Entry

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.

loading bay clerk	enters delivery manifest
loading bay clerk	wants to accept a delivered drum load
depot governors	want to ensure depot safety compliance
loading bay clerk	initiated a drum load delivery
system	accepts a delivery manifest for a drum load,
	including:
	load hazard type
	load drum count
system	checks available storage space
	indicates how many drums may be safely accepted

Delivered Drum Acceptance

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.

loading bay clerk	accepts drum from a delivered load
loading bay clerk	wants to accept a delivered drum load
depot governors	want to ensure depot safety compliance
loading bay clerk	initiated a drum load delivery, entered a delivery manifest
loading bay clerk	requests a label for a checked drum
system	accepts drum description, including measure + quantity
	assigns a drum identifier, and
	prints a drum label, or
	indicates the drum should be returned
loading bay clerk	attaches the label to the checked drum
	places the drum in the appropriate loading bay area

Delivery Completion

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.

loading bay clerk	ends a drum delivery
depot manager	wants accurate depot map
depot governors	want to ensure depot safety compliance
loading bay clerk	initiated a drum delivery, entered a delivery manifest
loading bay clerk	notifies the system when a delivery is finished
system	prints:
	a returned drum report
	a discrepancy report
	a drum allocation report

Drum Load Collection

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.

depot	produces a collected drum load
loading bay clerk	wants to collect a drum load
depot governors	want to ensure depot safety compliance
loading bay	was empty
collection truck	arrived at the loading bay
loading bay clerk	selects drum load collection
system	accepts a drum load collection order
	prints a drum load collection manifest
drum handler	collects drums from storage buildings
	delivers drums to the loading bay
loading bay clerk	checks each collected drum out of inventory
system	prints a drum collection manifest
drum handler	loads collected drums onto the waiting truck

Collected Drum Removal

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.

loading bay clerk	removes drums from inventory
loading bay clerk	wants to remove a collected drum from inventory
depot governors	want to ensure depot safety compliance
loading bay clerk	initiated a drum load collection, entered a collection order
loading bay clerk	selects drum removal
system	accepts a drum identifier
	removes the drum from inventory
loading bay clerk	releases the drum for loading

Collection Completion

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.

loading bay clerk	ends a drum collection
loading bay clerk	wants to complete a drum collection
depot governors	want to ensure depot safety compliance
loading bay clerk	initiated a drum collection, entered a collection order
loading bay clerk	notifies the system when the load is finished
system	prints a drum load collection manifest

Drum Storage Space Allocation

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.

system	allocates drum storage space
depot manager	wants accurate depot map
depot governors	want to ensure depot safety compliance
loading bay clerk	initiated a drum load delivery or collection
system	(de)allocates drum storage space
	given:
	a hazard type
	a drum count
	a depot map
	depot building licenses + inventory
	allocation policies