1. Shown below is a trapezoidal area which will be excavated and used as borrow pit. It has been laid out by lines at right angles to each other at given distances. The elevation of each grade intersection is as indicated in meters. It is desired to excavate the same to elevation 52.5 m. Determine the volume of excavation in cubic meters by using the formula of truncated prisms. 6 54 56 60 63 65 5 55 59 62 64 67 59 60 63 65 68 5 64 66 69

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