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The upper, outmost layer of soil having the highest concentration of organic matter and microorganisms and where the majority of biological soil activity occurs.
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Related Code Sections

J107.2 Grading, Surface Preparation
The ground surface shall be prepared to receive fill by removing vegetation, topsoil and other unsuitable materials, and scarifying the ground ...
J107.2 Grading, Surface Preparation
The ground surface shall be prepared to receive fill by removing vegetation, topsoil and other unsuitable materials, and scarifying the ground ...
R504.2 Floors, Site Preparation
The area within the foundation walls shall have all vegetation, topsoil and foreign material removed, and any fill material that is added shall ...
R504.2 Floors, Site Preparation
The area within the foundation walls shall have all vegetation, topsoil and foreign material removed, and any fill material that is added shall ...