engineering volume under spot heights calculation

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You did not explain how the 4 came in the column of square

KaumaHarriet-wl
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The junctions of the square grid shown below were levelled to determine the volume of excavation necessary in the construction of a basement floor. The reduced levels of the grid points are as shown.

X

X

X

185.67

186.22

187.34

X

X

187.45

188.00

X

X

X

X

X

186.33

187.03.

187.22

X

X

X

186.64

186.98

187.44

X

187.08

X

187.56.

187.90

X

X

X

X

187.35.

187.89

187.34

187.43

X

X

X

X

187.26

187.24

187.46

188.02

187.93

The horizontal distance between the grid points is 20 m and the required formation level of the basement floor foundations is to be 178.00 m. Calcu- late the volume of the excavation within the grid area.

Please I need help 🙏🙏🙏

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