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(i) Manhole covers must be labeled "City of South Bend" with "Storm" or "Sanitary" <br />b. Frame: East Jordan Iron Works manhole frame 2450 (Neenah R-1642-A) or <br />approved equal. <br />3. The catch basin cover and frame shall be the following: <br />a. Cover: East Jordan Iron Works catch basin cover (grate) 1130 (Neenah R-2510-A) or <br />approved equal <br />b. Frame: East Jordan Iron Works manhole frame 1135Z or approved equal <br />XII. DIVISION E: SEWER MATERIALS - RISERS <br />A. Prevailing specifications/INDOT Standard Specification Section: 908, 907, 910 <br />B. Additions: <br />1. Manhole risers shall conform to the following: <br />a. All risers shall pivoted turnbuckle adjustable riser rings <br />b. Adjustable turnbuckle must be pivoted on 304 stainless steel roll pins at both ends <br />which eliminates binding of mechanism when expanding or contracting manhole <br />riser. <br />c. The linkage assembly shall not contain tac-welds. <br />d. The linkage shall pivot inside a solid 3/" thick bar. The linkage shall accommodate <br />an adjustment to the diameter of the ring of %" in either direction (larger or <br />smaller). <br />e. The ring must be a single piece assembly, with no loose parts. <br />f. Riser must expand to obtain full circumferential engagement. <br />g. The riser shall not obstruct entrance to a manhole. There are no extensions to <br />hinder men or equipment using the manhole. <br />h. All moving parts and mating surfaces are zinc plated with dichromate finish or <br />stainless steel. Skirts are G90 galvanized. <br />i. Skirt must be welded 85% of the circumference of riser,. <br />j. Manhole riser allows efficient application of the pivoted turnbuckle so that 60 lbs. <br />force applied 7" from center of turnbuckle exerts 5600# tangential force in the riser <br />ring. This enables the riser ring to be forced to fit worn out of round manhole lid <br />seats and still exert a great force on the side walls for holding power. <br />k. Manhole risers shall be color coded prior to delivery based on the following:; <br />Rinq Diameter <br />Color <br />20 3/4" D <br />Silver <br />21 3/4" D <br />Blue <br />22 1 /8" D <br />Red <br />