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<br />500-2 <br /> <br />I ~I <br />I <br />li~i <br />Ii <br />1:1 <br />I ~I <br />1'\1 <br />1:1 <br />i <br /> <br />_1\1 <br />" <br />, <br /> <br />I <br />1\\ <br />I <br />J <br />IJI <br />II' <br />I! <br />IJ <br />,,1 <br />I) <br />I' <br />I! <br /> <br />, I <br />l.i <br />I~ <br />11 <br /> <br />502.2 il9ints <br /> <br />pipe joints shall meet the requirements of A~S.T.M. <br />speoifica~ion C-361, Bureau of Reclamation, Type R-4. Joints <br />between sections in manholes and oatch basins shall be cement <br />mortar. Precast manhole joint material shall be of an approved <br />gasket. <br /> <br />502.3 Manholes and Catch Basin~ <br /> <br />Manholes shall be precast concrete manholes. Precast concrete <br />manholes shall comp~y with A.S.T.H.Designation C-478. Manholes <br />shall be four feet (4') in diameter unless otherwise noted on <br />the plans. Manhole precast top sections shall be ~ccentric <br />cones or flat slab as indicated in the Plans. <br /> <br />catch Basins shall be precast concrete catch basins. Precast <br />catch basins shall comply with A.S.T.X. Designation C-478. <br />Catch Basins shall be 27ft in diamet~r unles's otherwise noted on <br />the plans and shall be Cretex Type 433F or approved equal. <br />Precast segmental block can be used and shall conform to <br />A.S.T.H. Designation C-139. Blocks shall provide an eight inch <br />(8ft) wall thickness. All block manholes shall be grouted <br />inside and outside to insure water tightness. <br /> <br />It is the intent that where precast manholes and catch basins <br />are used, that adjustment rings be provided to allow for a <br />minimum of six inch (6U) adjustment. All manholes and catch <br />"1?asins shall be, watertight. <br /> <br />Mortar shall conform to A.S.T.H. Designation C-270 under <br />Property Specification. Hydrated Lime conforming to'A.S.T.M. <br />" 'Designation C-207 shall ' be used in the mixture. Mortar <br />aggregate shall conform to A'.S.'T.H.' Designation 'C-144. <br /> <br />castings <br /> <br />Manhole and catch basin castings shall be Neenah Foundry, EBB <br />Bros., or approved equal, and shall.be as noted on plans, <br />details, or in drainage chart. Manhple casting shall have <br />two (2) open pick holes in the cover~ <br /> <br />502.~ ~a~ole ~teps <br /> <br />502.4 <br /> <br />Manhole steps shall be cast iron, pl~stic, or aluminum alloy <br />equal to Neenah R-1980 Series 1 and 2 and spaced at sixteen <br />"inches (16"). <br /> <br />502.,6 ',' , ~prons wi th Tr~s~ Guards <br /> <br />All aprons will be furnished with trash guards and tied to the <br />next two upstream pipes using "0" bolt fasteners as shown on the <br />detail sheet of the plans. <br />