Survey lines and grade hubs shall be provided by the owner's engineer at a maximum spacing of 100 foot intervals and at all changes in line and grade regardless of whether a laser beam is used.
(A) Depth of pipe cover. All pipe shall be laid to a minimum depth of six feet measured from the existing or proposed ground surface to the top of the pipe barrel unless specifically allowed otherwise in special circumstances by the Village Engineer.
(B) Pipe cradle (bedding). Granular pipe cradle material shall be required on all sanitary sewers installed in the village. Granular pipe cradle shall be a minimum of four inches thick below the pipe in earth or gravel excavation and a minimum of six inches in rock excavation for the trench. The cradle shall extend up to the mid-point (springline) of the pipe. For clay or PVC pipe, the trench must be backfilled with granular material to a minimum of 12 inches over the top of the pipe per the applicable East Dundee Standard. The embedment granular material shall conform to Class 1A meeting Gradation CA-7 set forth in Article 1004.01 of the State Specifications for Road and Bridge Construction.
(Ord. 07-57, passed 12-17-2007)