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Drawings Section. <br />(12) Remove existing rafter support ring below roof vent and install new 8' <br />diameter x 6" x 6" x 3/8" angle rafter support ring. Weld new support <br />ring to ceiling. Weld ends of each rafter to rafter support ring. Provide <br />temporary construction bracing as required while installing ring and <br />rafters. See Detail in Drawings Section. <br />(13) Remove 3 abandoned 6" channels lying flat on roof and previously used <br />to support antenna bracket next to center vent. <br />(14) Remove existing probe holder on roof of tank and weld 6" diameter x <br />1/4" thick plate over hole. <br />(15) Replace existing overflow pipe with new 16" diameter schedule 40 steel <br />pipe from grade to existing high water line. Replace interior weir pipe <br />with new pipe weir. Install new overflow pipe supports spaced Approx. <br />10' apart using 6" square x 1/4' thick A36 steel plate positioned vertically <br />from leg to pipe. Install new CLOW or MUELLER flap vale on end of <br />pipe. Match existing overflow level. Location of overflow pipe must be <br />approved by Engineer's Field Representative on site prior to installation. <br />(16) Provide and install concrete splash pad below overflow pipe. See Detail <br />in Drawings Section. Ensure splash pad slopes away from tank and <br />toward drainage area at a 1/12 downward slope. Location of splash pad <br />must be approved by Engineer's Field Representative on site prior to <br />installation. <br />(17) Provide temporary plywood cover to protect roof of existing building <br />located behind leg ladder. Building is approx. 8' square x 8' tall. Cover <br />building roof with plywood to protect exterior during sandblasting and <br />painting. Remove plywood cover after painting is complete. <br />(18) Remove existing cathodic protection system from structure including all <br />cover plates on roof and all wiring on interior of tank. Weld 6" diameter <br />x 1/4" thick A36 steel plates over all (Approx.l5) existing access holes on <br />roof. Weld top side only and caulk interior side at ceiling. <br />(19) Provide and insta111' wide x 1/4" thick A36 steel reinforcing pad in bowl <br />of tank around riser pipe penetration. Re-pad to be welded all around to <br />tank floor and riser. Re-pad to be Approx. 6' O.D. and 5' I.D. <br />SW - 4 <br />_ _ 435 <br />