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Site datum (Reduced levels)

There are four fixed RLs for the Centre of Construction at the college site as shown in the photos.

The northeast corner of the college site is the site datum RL = 100.000 metre.

Each group need to ensure that the Backsight of your first staff reading and the Forsight of your last staff reading coincide with the established RLs of another known RL-location.
A misclosure of less than 20 mm is, however, acceptable.

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