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CD-410 Manhole Riser Ring Type I w- + PLAN -.q- '- ~ I 40-1/4" 38-1/4" DIA. 1/2" SET SCREW SEE PLAN VIEW) 36" DIA. 37-1 2" MAX. DIA. (TOLERANCE=-1/16") SECTION A-A NOTES: 1 /2 THREADED HOLES WITH 1" LONG HEADLESS SET SCREWS AT 1/3 POINTS ON RING. TOTAL OF 3 REQUIRED. CAST IRON RISER RING -w CAST IRON RISER RING 1. ALL CONTACT AND BEARING SURFACES OF RISER RING SHALL BE MACHINED FLA T AND TRUE. 2. THE MANHOLE RISER RING SHALL BE CAST IRON CONFORMING TO ASTM SERIAL DESIGNATION A-48, CLASS 30. 3. TOLERANCES FOR DIMENSIONS SHOWN SHALL BE OF AN ORDER EQUIVALENT TO THE STANDARD FOR THE INDUSTRY UNLESS OTHERWISE INDICATED. MANHOLE RISER RING TYPE I SCALE: NOT TO SCALE DATE: SEPTEMBER 13, 2006 DRAWN BY: LDH V:\CAD\NEW STANDARDS APPROVED: .. ~ r?:2:n~~~~I~ PUBLIC WORKS DIRECTOR CD-41 0