Bedding, other than concrete embedment, shall consist of gravel, crushed gravel, pea gravel, crushed stone or crushed slag, one-fourth of an inch to three-fourths of an inch in size. As a minimum, the material shall conform to the requirements of Article 704. 01 of Standard Specifications for Road and Bridge Construction, of the State of Illinois, or ASTM C-33. The gradation shall conform to gradation CA 7, CA 8, CA 11 or CA 13 of the Illinois Standard Specifications or to ASTM Gradation No. 67. The pipe shall be laid so that it will be uniformly supported and so that the entire length of the pipe barrel will have full bearing. No blocking of any kind shall be used to adjust the pipe to grade except when used with embedment concrete. Bedding shall be required for all sewer construction, except ductile iron pipe, and shall be of a minimum thickness equal to one-fourth of the outside diameter of the sewer pipe, but not less than four inches.
(Ord. 1975-15. Passed 11-10-75.)