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<br />Mr. Foster McMasters <br />Metcalf & Eddy of Ohio, Inc. <br /> <br />May 16, 2000 <br />Page 7 of 14 <br />a) Remove the following buried pipes after receiving the repair parts for the 2000 <br />Dewatering Centrifuge Project: <br />i) the existing buried 4" ? DI Thennal Conditioning Feed Line in the yard south <br />of LP 1; <br />ii) the e<Yisting buried 4" ? DI Thermal Conditioning Sludge Line in the yard <br />south of LPl; <br />iii) the existing buried 1 1/2" ? DI Solvent Wash Return Feed Line in the yard <br />south of LP 1; and <br />iv) the existing buried 4" ? DI Vacuum Filter Feed Line in the yard south of LP 1. <br />b) Remove the temporary, above ground 6" ? DI Centrate Line between the buried <br />6" ? DI Centrate Line east of the existing 4" ? DI Vacuum Filter Feed Line in the <br />yard south of LP 1 and the east wall of the SLB; and <br />c) Install a buried 6" ? DI Centrate Li.ne between the buried 6" ? DI Centrate Line <br />east of the existing 4" ? DI Vacuum Filter Feed Line in the yard south of LP 1 and <br />the east wall of the SLB. <br />3. Construction of a new 2" ? DI Centrifuge Sludge Feed Line: <br />a) Remove the existing 3" ? SS Oxidized Sludge Feed Line between the concrete <br />access box located between the two existing Oxidized Sludge Tanks and the two <br />oxidized sludge sandpiper pumps in Tunnel A; <br />b) Core drill through the west wa11 of concrete access box located between the two <br />existing Oxiriized Sludge Tanks; <br />c) Install a;buried 2" ? DI Centrifuge Sludge Feed Line from the west wa11 of the <br />SLB into Tunnel A through the item 3.b) cQre drill and the hole used by the <br />removed 3" ? SS Oxidized Sludge Feed Line in the bottom of the concrete access <br />box located between the two existing Oxidized Sludge Tanks; <br />d) Extend the 2" ? DI Centrifuge Sludge Feed Line through Tunnel A to the South <br />Dewatering Centrifuge Feed Pump; <br />e) Remove the existing 4" ? DI Thermal Conditioning Feed Line discharge piping <br />and valves connected to the North Dewatering Centrifuge Feed Puxnp; and <br />f) Connect the 2" ? DI Centrifuge Sludge Feed Line to the discharge side of the <br />North Dewatering Centrifuge Feed Pump. <br />4. Installation of a segment of a 2" ? PVC Centrifuge Feed Pumps Instrumentation and <br />Control Conduit: <br />a) Core drill through the west wall of concrete access box located between the two <br />existing Oxidized Sludge Tanks; <br />b) Core drill through the bottom of the concrete access box located between the two <br />existing Oxidized Sludge Tanks; <br />