2023 09 19 City Council Packet

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• E
levations will meet the posted standards of the NC VRS network.  
• All surveying services will be “Class A” surveying standard and performed 
in compliance with the Standards of Practice for Land Surveying in 
Tennessee as defined for GIS surveys. 
• The horizontal datum is NAD 83/2011. 
• The coordinate system is Tennessee State Plane 4100. 
• The vertical datum is NAVD 88. 
• The unit of measurement is the US Survey Foot.  
 
Owner will be responsible for notifying property owners of surveying activities and 
the need to access drainage easements or private property.  Owner will provide 
Engineer with a letter stating that field crews are authorized to enter private 
property for the purposes of this project.   
2.2  - Geodatabase Review 
Engineer will review/audit the City’s geodatabase that includes feature classes for 
data collected as part of the project and identify data “gaps.”  Point feature classes 
are expected to include drainage structure, pipe end, and difficult access.  Line type 
feature classes are expected to include culverts, pipes, and secondary open 
channels. Engineer will provide Owner  with a written summary of geodatabase 
review comments.   
2.3  - Closed System  
Engineer’s Survey Subconsultant will employ conventional survey or survey grade 
GPS to locate the x, y, and z coordinates of each visible stormwater system structure 
24” in diameter and larger. Engineer will collect various attributes for the structures 
as needed for  the Condition Assessment and Hydrologic & Hydraulic Modeling 
tasks. This information will be used to supplement Owner’s existing geodatabase.  
Attributes may include but are not limited to the following: 
• Unique identification number 
• Horizontal (x, y) location 
• Vertical (z) location (structure) 
• Structure type  
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