contractor, coordinating the dismantling of each barrack in a systematic approach, and

collecting data during the deconstruction process. With the aid of Costello Dismantling

Co., Inc. (Boston, MA, USA), contracted in the early stages of the project, the

deconstruction team carefully documented in 15-minute intervals at the deconstruction

site the following information: type and amount of material salvaged or disposed, method

of material removal (manual or mechanical), time required to salvage and/or demolish,

time required for machine operation, total labor time and transportation requirements, as

previously described in detail (Guy and Williams, 2004). The LCA team transferred the

data collected from the site and applied these data to the modeling efforts.

 As stated previously, the primary goal of this project was to assess the optimum

combination of manual and mechanical methods of barracks removal, as measured by

minimum environmental/public health life cycle impacts. To this end, four scenarios

were designed and compared. The first scenario involved removal of one barrack using

entirely manual deconstruction (labeled as "100% Manual"). The second and third

scenarios involved manual deconstruction only 44% and 26% of the total time required

for removal, respectively, with the remainder of the time involving traditional mechanical

methods. These two scenarios are labeled henceforth as "44% Manual" and "26%

Manual," respectively. The fourth scenario involved removing a barrack using only

mechanical methods of demolition, as traditionally used, and this scenario is denoted as

"100% Mechanical." The percentages of time used for mechanical demolition and

manual deconstruction were determined by dividing the total time required for building

removal into the total time required for machine operation and/or labor.