MDec (mechanically assisted deconstruction)

 This category includes all work associated with removing materials with

potential for processing and salvage from the building with mechanical assistance.

This includes both mechanical labor time and any hand labor time that is needed to

prepare for the mechanical work. For instance, on one of the buildings, the

deconstruction method involved removing large panels of the roof using a crane.

The time spent actually lifting the panels off by crane is MDec, and so is any time

spent bracing a panel by hand so that it will stay in one piece while being lifted off,

cutting the panel free from surrounding materials, and attaching the lifting

mechanism.

MDem (mechanically assisted demolition)

 This category includes work associated with removing materials from the

building with mechanical assistance for disposal.

N (non-productive)

 Non-productive time includes all "on-the-clock" time that is not spent in any of

the other categories. Activities such as water breaks (though not lunch), discussing

what to do next, receiving instruction, tool and work station set-up at the beginning

of the day and break-down at the end, miscellaneous clean-up (though not disposal

of an individual material that has just been demolished getting materials to the

roll-offs is part of demolition), building ramps or sawhorses, running caution tape,

and many other activities that do not directly contribute to the removal or

processing of the building materials are non-productive.