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Table 434.6-1 Minimum Cover for Buried Pipelines
Cultivated, agricultural areas where plowing or subsurface ripping is common [Note (1)] 48 (1.2m)
Industrial, commercial, and residential areas 48 (1.2m)
River and stream crossings 48 (1.2m)
Drainage ditches at roadways and railroads 48 (1.2m)
All other areas 36 (0.9m)
NOTE:
(1) Pipelines may require deeper burial to avoid damage from deep plowing; the designer is cautioned
to account for this possibility
Location Normal
Class 1 24 (610)
Class 2 30 (760)
Classes 3 and 4 30
Drainage ditch at public roads and railroad crossings (all locations) 36"