(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 ring and cover.
(1) Minimum clear opening shall be 22-inches.
(2) Minimum weight for frame and cover shall be 310 pounds and suitable for Heavy Duty Highway Traffic Loads of H-20.
(3) Frame shall have four 1-inch anchor bolt holes equally spaced.
(4) "Storm Sewer" shall be cast on the cover as appropriate. Casting shall bear the name of the manufacturer and the part number.
(5) Provide cover with two 1-inch perforated holes.
(c) Grate and frame.
(1) Grate and frame shall be NCDOT Standard.
(2) Grate and frame shall be suitable for heavy duty highway traffic loads of H-20.
(3) Casting shall bear the name of the manufacturer and the part number.
(Ord. of 11-7-16, No. 10-16)