Our experience on projects is that limiting the access to one door with a long, regularly cleaned carpet, is expected by the LEED reviewer. We are currently working on a three story building and the contractor is questioning why we need to limit access to one door. He doesn't see it in the manual nor the SMACNA guidelines for Source Control. While I understand the guidelines are broad suggestions I realize now that he is NOT going to limit the access AT ALL if I can't find a reference to the requirement. Does anyone have any suggestions? What about limiting him to 2 entrances? Thanks for your help.