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CD-408 Type II Manhole Base PLAN ,- 5' Co PLAN TYPE II MANHOLE BASE SCALE: NOT TO SCALE DATE: SEPTEMBER 13, 2006 DRA WN BY: LDH V:\CAD\NEW sa~NDARDS APPROVED: r?:Q~~~ SHEET 1 OF 3 PUBLIC WORKS DIRECTOR CD-408 FORM RECESS FOR MANHOLE PRECAST MANHOLE SECTION. WHEN THERE IS NOT SUFFICIENT CLEARANCE BETWEEN THE TOP OF THE MANHOLE BASE AND FINISH GRADE FOR A PRECAST SECTION, USE TOP SLAB. SEE NOTE 4 SLOPE TO DRAIN WITH MORTAR 9" WALL THICKNESS (TYP.) 00 ~ SEE NOTE 7 + CONSTRUCTION JOINT OPTIONAL WHEN CAST -IN-PLACE PIPE IS USED W 0.... a::: -.;t- f- W (/) f- W o ~ z ~ W .-J W I..L. (/) 0 0::: l=! W ~ <l:: CS CLASS 2 CONCRETE #4 BARS @ 12" O.C. EACH WAY, EACH FACE 2" CLEAR INSIDE SPACE BOTTOM SLAB TO BE IN PLACE PRIOR TO CONSTRUCTION OF PIPE, WHEN CAST -IN-PLACE PIPE IS USED SECTION A-A 1[~ PIPE MORTAR SECTION B-B TYPE II MANHOLE BASE SCALE: NOT TO SCALE DATE: SEPTEMBER 13, 2006 DRA WN BY: LDH V:\CAD\NEW STANDARDS APPROVED: ~.M~SHEET 2 OF J 'PUBLlC ORKS DIRECTOR CD-408 ASPHALT CONCRETE CONCRETE PAD 4'-6" SQUARE FRAME AND COVER SEE NOTE 5 GROUND SURFACE SEE NOTE 6 :....:..: ~10.. ','~.."~ 'N ~~ k.....: -.;t- ~ 0 ..:~..: "'-"~ ~ : ~:.~ :~. #4 BARS @ 14" O.C. EACH WAY, 2" CLEAR PAVEMENT CONDITION NATURAL GROUND CONDITION USE TOP SLAB: WHERE THERE IS NOT SUFFICIENT CLEARANCE BETWEEN THE TOP OF THE MANHOLE BASE AND FINISH GRADE FOR A PRECAST SECTION AND SECTION MANHOLE COVER FRAME. WHEN PLACING A TYPE A OR TYPE C INLET OPENING ON A TYPE II MANHOLE BASE. THE OPENING IN THE SLAB SHALL CONFORM TO THE INSIDE DIMENSIONS OF THE INLET TO BE USED. NOTES: SECTION C-C TOP SLAB 1. ALL REINFORCED CONCRETE SHALL BE CLASS 2 (590 LBS PCC PER CUBIC YARD). 2. CONSTRUCTION JOINTS ARE OPTIONAL WHERE SHOWN. OTHER LOCATIONS ARE SUBJECT TO APPROVAL BY THE PUBLIC WORKS DEPARTMENT. KEY DIMENSIONS ARE 1-1/2" x 3". 3. INLET AND OUTLET PIPES SHALL NOT INTERSECT A MANHOLE BASE THROUGH A CORNER. IF SKEW ANGLE IS TOO GREAT TO PERMIT THE OPENING TO BE MADE IN A SINGLE WALL, USE A TYPE III MANHOLE BASE (SEE STANDARD PLAN CD-409). 4. TYPE I MANHOLE BASES (STANDARD PLAN CD-407) ARE FOR USE WITH PIPES TO 24" IN DIAMETER AND WHERE THERE IS SUFFICIENT COVER TO USE A MINIMUM LENGTH MANHOLE BARREL, ECCENTRIC CONE, AND COVER FRAME. TYPE II MANHOLE BASES ARE FOR USE WITH PIPES TO 42" IN DIAMETER. MANHOLE BASES FOR PIPES LARGER THAN 60" IN DIAMETER SHALL REQUIRE A SPECIAL DESIGN. 5. FOR DETAILS OF MANHOLE FRAME AND COVER, SEE STANDARD PLAN CD-407. ORIENT FRAME DIRECTL Y ABOVE STEPS. 6. SEE STANDARD PLAN CD-407 FOR STEP DETAILS AND LOCATION. 7. STEPS SHALL BE STEEL REINFORCED POLYPROPYLENE PLASTIC, SANTA ROSA CAST PRODUCTS CO. DWG. NO. PS2-PF OR EQUIVALENT. STEPS TO BE CAST IN PLACE OR PRESS FITTED INTO PROVIDED HOLES AS PER MANUFACTURER. INSTALL STEPS WITH LOWEST RUNG 1'-0" ABOVE THE FLOOR AND HIGHEST RUNG NOT MORE THAN 6" BELOW TOP OF MANHOLE. THE SPACING BETWEEN STEPS SHALL NOT EXCEED 16" AND SHALL BE UNIFORM THROUGHOUT THE LENGTH OF THE WALL. PLACE THE STEPS IN THE WALL WITHOUT A PIPE OPENING. NO STEPS REQUIRED WHERE DISTANCE FROM FLOOR OF MANHOLE TO TOP OF MANHOLE IS LESS THAN 2'-6". TYPE II MANHOLE BASE SCALE: NOT TO SCALE DATE: SEPTEMBER 13, 2006 DRAWN BY: LDH V:\CAD\NEW STANDARDS SHEET 3 OF 3 CD-408