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Preliminary Survey:
 
 
 
 
 
 
 
 
 
 
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Preliminary Survey:

Survey crews are then sent to map the flagged line from the
beginning to each flag measuring (chaining) horizontal distances
and recording deflection angles at each change in direction. It is
imperative that the survey be closed or tied-down to known survey
points at the ends of the line! The survey is drawn on paper and


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given to the landscape architect for refinement—-curves and tangents
are drawn between P.I.s, the centerline is stationed, and the deflection
angles are plotted to establish deltas for each curve. The
landscape architect and engineer examine the line to confirm those
details of location made by the team in the field. Once the alignment
is approved and before more design time is invested in the
project, the proposal is presented at a public hearing with a rough
draft of an Environmental Impact Statement. In the case of state
or county roads, a right-of-way drawing is made showing the properties
affected by the alignment.