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The Vertical Benchmarks are used to establish elevations for the design of City Improvement Projects.The dataset contains 2 types of benchmarks:<\/SPAN><\/P>

  1. Benchmarks established by the original City leveling surveys are designated non-adjusted. Those have a value of \u201cNo\u201d on the USGS Adjusted field.<\/SPAN><\/P><\/LI>

  2. Benchmarks established by subsequent City leveling surveys primarily based on the 1970 United States Geodetic Survey (USGS) adjustment and designated as adjusted. Those have a value of \u201cYes\u201d on the USGS Adjusted field or an asterisk at the beginning of the Description field.<\/SPAN><\/P><\/LI><\/OL>

    The published benchmark values of the 2 sets may not match each other within a couple of tenths of a survey-foot and should not be used together to control the same survey. 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