1. 1 LBT Q4 2007 Engineering Review ICS – Instrument Cooling System

2. 2 Highlights (Q4/2007) IC system is operational, it has not been commissioned IC system is operational, it has not been commissioned Tree house flow restriction Tree house flow restriction Chiller and IC system operates off of siphon principle, not good for our dynamic system Chiller and IC system operates off of siphon principle, not good for our dynamic system Both sides are operating, lightly loaded Both sides are operating, lightly loaded

3. 3 Open Issues Technical Technical IC system not designed for fluctuating loads IC system not designed for fluctuating loads Heat exchanger on tree houses restrict flow to 7 gpm Heat exchanger on tree houses restrict flow to 7 gpm ICS needs to be tested to determine if design requirements are met, commissioning ICS needs to be tested to determine if design requirements are met, commissioning Schedule Schedule Verify operation, coil sizes, redo prints, put in expansion tanks, proper bypass Verify operation, coil sizes, redo prints, put in expansion tanks, proper bypass Financial Financial Maybe large if have to redesign, however, if it meets the requirements then there will be no more cost Maybe large if have to redesign, however, if it meets the requirements then there will be no more cost Resource Resource Searching for a consultant to address overall system design issues Searching for a consultant to address overall system design issues

4. 4 Progress (Q4/2007) Both upper tree houses are operational, but not been commissioned Both upper tree houses are operational, but not been commissioned Upper tree houses are ready for commissioning Upper tree houses are ready for commissioning Lower tree house trap doors are being installed Lower tree house trap doors are being installed Lower tree house controllers are being installed Lower tree house controllers are being installed

5. 5 Planning (Q1/2008) Install lower tree house air circulation motors Install lower tree house air circulation motors Support engineering with further installation of trap doors and controllers in 2 lower tree houses Support engineering with further installation of trap doors and controllers in 2 lower tree houses Find a solution to the flow restriction in the tree houses Find a solution to the flow restriction in the tree houses Commission tree house cooling Commission tree house cooling