Resolutions-1997-021

b. Low head pipe: All joints will be sealed using an approved mastic material and each joint shall be wrapped with 24 inches of approved filter fabric. If the Hydraulic grade line is less than 6 inches above the top of the pipe during the 100-year event, mastic joint material may be omitted. 2. Wall Thickness: Minimum wall thickness will be B-wall as defined in ASTM C76. 3. The required pipe strength and bedding requirements shall be calculated on a case-by-case basis. The minimum pipe strength shall be Class III as defined in ASTM C 76. 4. Pipe Markings: All pipe shall be marked with the date of manufacture and ASTM class. If quadrant reinforcement is used, the top shall be marked on the outside of the pipe. 5. No lift holes. 6. All RCP shall be manufactured by an IDOT certified facility. B. Ductile iron pipe meeting the following standards may be used. 1. Joints: Use push on gasketed joints. 2. Thickness: Use Pressure Class 350 standard unless a thicker wall is required because of depth. 3. Lining and Coating: a. Inside of pipe and fittings: Double thickness cement lining and bituminous seal coat conforming to ANSI A21.4. b. Outside of other pipe and fittings: Standard bituminous coating conforming to appropriate AN Standard. C. Corrugated PVC with a smooth interior wall meeting the following standards may be used only under the conditions specified below: 1. The pipe shall meet the standards of ASTM F949-90 constructed of resins meeting the requirements of ASTM D1784, cell class 12454B. 2. Size: 12 inch through 18 inch. 3. Joints: Gasketed. 4. Perforated PVC pipe meeting the standards of paragraph 1 and 2 above may be used provided the pipe is surrounded by a freely draining aggregate or fabric sock. 5. Manhole connections shall be approved by the City Engineer.