Re:
..."Material provisions could include agreement to :
#(1) use electronic scanners to record work hours (and could include arequirement that such costs be shared);
#(2) use site security cameras linked to the internet to allow the District Council Office of the Inspector General (“IG”), and a counterpartselected by the contractor, to view the site at any time;
#(3) have random and off-hour inspections of the work site by the District Council;."..
http://quadrocopter.usI would say: 10 machines for a start:)
http://vimeo.com/24527147