From: Voorhis, Mark L. Sent: Tuesday, February 05, 2008 1:17 PM To: Weaver, John R; 'Jennifer Monahan'; Steve Jurss; 'Dave Lubelski' Subject: Semi Annual cleanroom and Lab PM Shutdown Schedule for Monday, March 31 2008, through Friday, April 4 2008 Monday, 10:00 AM: All materials must be removed from cleanroom solvent hoods. Monday, 4:00 PM: All materials must be removed from the remaining cleanroom hoods Tuesday, 7:30 AM: CLEANROOM CLOSED. No ultrapure water available. No acid processing in laboratories. No hazardous gases available. Wednesday, all day: CLEANROOM CLOSED. No ultrapure water available. No acid processing in laboratories. No hazardous gases available. Wednesday, 4:00 PM: All materials must be removed from laboratory hoods (Including biosafety cabinets; all bio materials must be removed from exhausted enclosures). Thursday, 8:00 AM: Cleanroom will re-open, barring unforeseen circumstances. All solvent hoods and processes will remain down for general exhaust upgrades. Thursday, all day: LABORATORIES CLOSED. Friday, 8:00 AM: Laboratories will re-open and Cleanroom general exhaust should be operational, barring unforeseen circumstances. Thank you for your cooperation and patience during this important preventive maintenance procedure. Regards, Mark Voorhis Building Manager Purdue University Birck Nanotechnology Center Office: (765) 494-3036