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Mr. Foster McMasters Metcalf & Eddy of Ohio, Inc. ,vlay 16, 2000 Page 8 of 14 c) Install a buried 2" ? PVC Centrifuge Feed Pumps Instsumentation and Control Conduit between the new core drills in the top of Tunnel A and the east wall of the SLB: d) Extend the 2" ? PVC Centrifuge Feed Pumps Instrumentation and Control Conduit to the two centrifuge feed pumps; and ej Install new control wiring between the Dewatering Centrifuge No. 1 control panel on the east wa11 of the SLB through the completed 2" ? PVC Centrifuge Feed Pumps Instrumentation and Control Conduit and connect to the existing instrumentation and control conduiting and wiring for the two Centrifuge Sludge Feed Pumps. 5. Conversion of the temporary 2" ? DU4" ? DI Thermal Conditioning Feed Line into a 2" ? DI Dewatering Centrifuge Sludge Feed Line connected to the South Dewatering Centrifuge Feed Pump. a) Remove the 4"x4"x2" wye in the existing buried 4" ? DI Thermal Conditioning Feed Line buried in the yard south of LP l; b) Remove the existing buried 4" ? DI Sludge Feed to Old LPO Line between the RSB and the and blind flange mounted onto the thimble inside the west wa11 of Tunnel A; c) Mount a new blind flange onto the thimble inside the west wa11 of Tunnel A having a one 2" ? DI inserts on the centerline of the existing 4" ? DI Sludge Feed to Old LPO Line; and d) Install a buried 2" ? DI Centrifuge Sludge Feed Line between the new blind flange mounted onto the thimble inside the west wall of Tunnel A and the east wa11 of the SLB. Final Professional Services The final services continue the Yard Piping and Tunnel A base rnapping and drawings prepared for the initial phase into the SLB as well as a11 work inside of the SLB. The fmal services would continue the yard piping of the first phase into the SLB in such a configura- tion that allows for the optimum SLB layout for the selected complete dewatering centrifuge system and a11 other associated equipment and appurtenances to be placed inside the SLB. Consistent with the original sequencing plan for the Project, the 2000 work inside the SLB would be completed before the City implements the design for the second phase of the yard piping and Tunnel A improvements. The original sequencing plan for the Project is Attach- ment 6 to this letter. The original sequencing plan for the Project is being supplied for informational purposes only since the plan will be updated throughout the Proj ect and thereafter.