estimating excavation considering bucket size, footing depth, and soil type



the image at right shows the cubic yard calculation for a 3' wide x 1' thick foundation with 2' of soil cover.  The chart below shows durations based on various bucket sizes in types B and C soils






WITH A 12" BUCKET, A 3' WIDE X 1' THICK CONTINUOUS FOOTING 10' LONG WITH 2' OF COVER TO TOP of FOOTING IN CLASS B SOIL WOULD TAKE .37 HOURS (22 MINUTES) TO EXCAVATE.  IN CLASS C SOIL IT WOULD TAKE .61 HOURS (37 MINUTES)
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