77 Ill. Adm. Code 905.APPENDIX A
A Illustrations and Exhibits
Section 905
Section 905.APPENDIX
AÂ Â Illustrations and Exhibits
Section 905.ILLUSTRATION IÂ Â Seepage Field Construction
Section 905.EXHIBIT AÂ Â Gravel System
Trench
length, maximum length from point of discharge into seepage trench
100 feet
Trench bottom, minimum width
8
in.
Trench bottom, maximum width
36
in.
Trench bottom, minimum depth
18
in.
Trench bottom, maximum depth
36
in.
Trench bottom, slope
level
Distribution line, minimum diameter
4
in.
Distribution line, minimum earth cover
6
in.
Distribution line, maximum earth cover
24
in.
Distribution line, maximum slope
level