(A) The bottom of the trench at and below the top of the pipe and inside the sheeting and bracing, if used, shall not exceed the following widths:
Pipe Size | Width | Pipe Size | Width | Pipe Size | Width |
Pipe Size | Width | Pipe Size | Width | Pipe Size | Width |
6" | 2'6" | 27" | 4'3" | 66" | 9'1" |
8" | 2'6" | 30" | 4'7" | 71" | 9'8" |
10" | 2'6" | 33" | 5'4" | 78" | 10'3" |
12" | 2'8" | 36" | 5'8" | 84" | 10'10" |
15" | 2'10" | 42" | 6'3" | 90" | 11'5" |
18" | 3'2" | 48" | 6'10" | 96" | 12'0" |
21" | 3'8" | 54" | 7'11" | 102" | 12'7" |
24" | 4'0" | 60" | 8'6" | 108" | 13'2" |
Note: The strength or class of pipe shall be as indicated on the plans or special provisions.
(B) Trench sheeting and bracing or a trench shield shall be used as required by the rules and regulation of O.S.H.A. The bottom of the trench excavation shall conform to the details shown on the plan.