DepotSafety allocates drums to available storage space StorageAllocation applies depot safety policies during storage allocation

 

StorageAllocation knows a kind of EPA hazard Hazard knows how many drums are assigned to a storage building StorageBuilding allocates drum storage to a storage building   applies drum storage safety policies during allocation       StorageAllocation class   produces prospective storage allocations   balances storage across prospective allocations

 

Building knows a building identifier   knows its location within the depot (address)   knows its physical dimensions Perimeter

 

Perimeter knows an origin Point knows a boundary extent (width x depth) Point can expand itself by some interval   can determine whether it overlaps another perimeter

 

StorageBuilding extends Building stores drums containing hazardous chemicals DrumStorage may only ever store two compatible hazard types EpaCompliance?

 

DrumStorage has a storage license for a specific kind of hazard StorageLicense knows how many drums it can store (storage limit)   contains some drums Drum knows how many more drums it can store (remaining capacity)

 

StorageLicense applies to a kind of EPA hazard Hazard applies to a specific storage building StorageBuilding knows a drum storage limit       StorageLicense class   maintains a license inventory (assets)   provies access to licenses by hazard

 

Hazard identifies a kind of EPA hazard       Hazard class   provides access to the registered hazard types: 1, 2, 3

 

Drum knows a drum identifier   contains a hazardous chemical Chemical knows its measurements Weight   Volume

 

Chemical knows its name   knows a formula   knows its EPA hazard classification Hazard     Chemical class   maintains a chemical registry   provides access to chemicals by name   provides access to chemicals by formula