(a) General.
(1) Made of gray iron, ASTM A-48 - Class 30, or ductile iron, ASTM A536, grade 65-45-12.
(2) Castings shall be free from imperfections not true to pattern. Casting tolerances shall be plus or minus 1/16-inch per foot of dimension. Top shall set neatly in frame, with edges machined for even bearing and proper fit to prevent rattling and flush with the edge of frame.
(3) Castings shall be as manufactured by Neenah Foundry Co., U.S. Foundry & Manufacturing Corp., or Vulcan Foundry.
(b) Manhole frame and cover.
(1) Minimum clear opening shall be 22 inches.
(2) Minimum weight for frame and cover shall be 300 pounds and suitable for heavy duty highway traffic loads of H-20.
(3) Frame shall have four 3/8-inch anchor bolt holes equally spaced.
(4) Cast “Sanitary Sewer” on the cover. Casting shall bear the name of the manufacturer and the part number.
(5) See details for various types of allowable covers. Utilize as appropriate for the intended application or as directed by the city.
(6) Bolt down covers shall be provided with four 3/8-inch stainless steel hex head bolts at 90 degrees.
(Ord. of 11-7-16, No. 10-16)