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This process involved locating an established benchmark or target for comparison purposes, then leveling and focusing the transit to insure accurate grade readings. We would "shoot" a few grades, then recheck the level settings and focus of the transit. Any number of factors could cause the transit to shift and then our readings, in relation to the benchmark, would be off. Failure to periodically recheck the equipment could lead us to set incorrect grade elevations and miss our target.
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