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| Type of Soil | Slope (x : y) |
| solid rock, shale or cemented sand and gravels | 0 : 1 |
| compact angular gravels | 1/2 : 1 |
| recommended slope for average soils | 1 : 1 |
| compact sharp sand | 1 1/2 : 1 |
| well-rounded loose sand | 2 : 1 |
Excavation in sharp sand should be sloped 1 1/2 unit for each unit depth.
(10 feet) (1 1/2 feet/foot) = 15 feet
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