1. 1 LBT Q2 2007 Engineering Review PWR: Site electrical power, includes power install on levels 1, PEPSI bridge, and 4, and power monitoring

2. 2 Highlights (Q2/2007) Instrument room power installed by contractor Instrument room power installed by contractor Machine shop moved to level 3L Machine shop moved to level 3L Power to 3L installation complete Power to 3L installation complete Materials being purchased for power additions to level 4 to support LUCIFER and LINC Materials being purchased for power additions to level 4 to support LUCIFER and LINC Power monitoring continuing Power monitoring continuing Monitoring PF on incoming switch gear Monitoring PF on incoming switch gear Phase imbalance noted on several 3 phase panels Phase imbalance noted on several 3 phase panels Phases balanced on telescope UPS power Phases balanced on telescope UPS power

3. 3 Open Issues Technical Technical Rebalance 3 phase panels Rebalance 3 phase panels Persistent ground problem on telescope, no isolated neutrals in instrumentation electronics, suspect surge suppressors Persistent ground problem on telescope, no isolated neutrals in instrumentation electronics, suspect surge suppressors PEPSI power requirements at bridge connection point PEPSI power requirements at bridge connection point Schedule Schedule Scheduled for Q3 or Q4 Scheduled for Q3 or Q4 Financial Financial Cost of materials for level 3 additions for instrument power, specifically cryo-cooler compressors Cost of materials for level 3 additions for instrument power, specifically cryo-cooler compressors Resource Resource Time to implement design Time to implement design

4. 4 Progress (Q2/2007) Installation of the instrument room nearing completion Installation of the instrument room nearing completion Power to level 3L machine shop complete Power to level 3L machine shop complete Planning for level 4 power expansion parts identified Planning for level 4 power expansion parts identified Phases on telescope UPS power balanced Phases on telescope UPS power balanced

5. 5 Planning (Q3/2007) Finish organizing machine shop Finish organizing machine shop Order materials for level 4 power expansion and start installation Order materials for level 4 power expansion and start installation Install connection point power for PEPSI at bridge location Install connection point power for PEPSI at bridge location Continue monitoring power quality Continue monitoring power quality Balance phases on level 1 UPS Balance phases on level 1 UPS