Takeoff surfaces

Generated name: Original ground (OG)

Classification: Original

Type: Layer

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This surface represents the original land, ground or improved surfaces as commonly measured by topographic survey operations and represented by existing contours, spot elevations, etc. Typically, there will only be one surface with this classification for your job site.

The Original surface classification is one that you can assign to any generalized surface. In addition, it is also assigned to a surface created by layers in the Original category in the Categorize Target Layerscommand. Surfaces of this classification affect earthwork calculations in the Takeoff Report and the Earthwork Report.

Generated name: OG with subgrades demolished

Classification: Original Earthen

Type: Layer

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This surface represents the uppermost surface of existing, in situ, earthen materials as it exists before any topsoil stripping occurs; that is, the uppermost surface of materials other than existing pavements, bases, subgrades, concrete slabs, etc. Such non-earthen materials may require demolition, removal, milling, reprocessing, or treatment other than that associated with normal mass earthwork operations. In the context of the Original surface, those non-earthen materials are collectively being referred to as existing in-ground site improvements. Their presence is acknowledged in forming the Original earthen surface; within any closed lines in which in-ground improvements are defined, the resulting original earthen surface will be that of the in situ earthen materials on which the materials from which those improvements are constructed lie. Typically, there will only be one surface with this classification for your job site.

A takeoff generated surface of this classification is automatically formed by the Build Takeoff Surfaces command if existing in-ground, site improvements have been defined in association with one or more layers, and closed lines are found on those layers. This will occur by subtracting the thickness of all material strata related to those improvements from the original surface.

Original earthen surface is also a classification that you can assign to a generalized surface. It affects earthwork calculations in the Takeoff Report.

Generated name: OG with topsoil stripped (& subgrades demolished)

Classification: Original Earthen Stripped

Type: Topsoil

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This surface represents the uppermost surface of existing, in situ earthen materials, excluding the topsoil that is to be stripped. It therefore represents alterations to the original surface that will result from topsoil stripping, and from a recognition of the volume occupied by existing in-ground improvements. Typically, there will only be one surface with this classification for your job site.

A takeoff generated surface of this classification is automatically formed by the Build Takeoff Surfaces command if one or more areas of topsoil stripping have been defined. In addition to reflecting topsoil removal, the stripped surface reflects alterations to the original surface, as affected by the definition of existing in-ground improvements, if applicable. This occurs by subtracting the thickness of topsoil to be removed from the original surface, if existing in-ground improvements are not a factor, or by subtracting topsoil thickness from the original earthen surface, if existing in-ground improvements have been defined.

The stripped surface plays a key role in earthwork calculations, as it represents the starting condition in which mass earthwork operations begin in circumstances where areas of topsoil stripping and handling have been designated.

Generated name: FD with topsoil absent (& subgrades adjusted)

Classification: Finished Earthen Stripped

Type: Topsoil

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This surface represents the uppermost surface of earthen materials other than proposed, in-ground improvements, as it is formed before and in preparation for topsoil replacement. It therefore represents alterations to the design surface that result from the anticipation of topsoil replacement, and from a recognition of the volume to be occupied by proposed, in-ground improvements, which are those material layers that may optionally be associated with an area-based site improvement. Typically, there will only be one surface with this classification for your job site.

A takeoff generated surface of this classification is automatically formed by the Build Takeoff Surfaces command if one or more areas of topsoil replacement have been defined. In addition to reflecting the volume to be occupied by replaced topsoil, the finished mass earthwork surface reflects alterations to the design surface as affected by the plans for construction of proposed in-ground improvements, if applicable. This occurs by subtracting the thickness of topsoil to be replaced from the design surface if proposed, in-ground improvements are not a factor, or by subtracting the topsoil replacement thickness from the finished earthen surface, if proposed in-ground improvements have been defined.

The finished mass earthwork surface plays a key role in earthwork calculations as it represents the final surface shape to be achieved by mass earthwork operations in circumstances where areas of topsoil replacement have been designated.

Generated name: FD with subgrades adjusted

Classification: Finished Earthen

Type: Layer

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This surface represents the uppermost surface of earthen materials other than proposed, in-ground site improvements, but including replaced topsoil; that is, the uppermost surface of materials other than proposed pavements, bases, subgrades, concrete slabs, etc. Such non-earthen materials as those noted above are constructed by operations other than routine earthmoving (mass earthworks). In the context of the design surface, these non-earthen materials are referred to as proposed, in-ground site improvements. They are defined by the material layers associated with proposed, area-based site improvements. Their presence is ignored in forming the finished earthen surface. Typically, there will only be one surface with this classification for your job site.

A takeoff generated surface of this classification is automatically be formed by the Build Takeoff Surfaces command if proposed in-ground improvements have been defined in association with one or more layers, and closed lines are found on those layers. This occurs by subtracting the thickness of all material layers related to those site improvements from the design surface.

Finished earthen surface is a classification that you can assign to a generalized surface as well. It affects earthwork calculations in the Takeoff Report.

Generated name: Finished design

Classification: Design

Type: Layer

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This surface represents the finished land, ground, or improved surface as typically built based on proposed contours, spot elevations, etc.

Design is a surface classification is one that you can assign to any generalized surface. In addition, it is assigned to that target surface created by the Categorize Target Layers command, which is represented by the Design tab. Surfaces of this classification will play a role in the earthwork calculations associated with a takeoff report as well as those produced by the Earthwork Report command. Typically, there will only be one surface with this classification for your job site.

Generated name: Original (subgrade)

Classification: Original

Type: Subgrade

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This surface represents the uppermost strata of the original surface minus the volume of existing, in-ground site improvements that are to be demolished.

Generated name: Design (subgrade)

Classification: Design

Type: Subgrade

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This surface represents the uppermost strata of the design surface minus the volume of in-ground site improvements that are to be constructed.

For paved areas, you can designate that paving material volumes be computed for one or more progressively deeper material layers to be constructed within the boundaries of any specific paved area. Each of those material layers will be composed of a designated construction material, and constructed at a specified depth (as determined by accumulative thicknesses), and in a specified order from the site improvement’s uppermost surface downward. Each material strata will have a name, a material (predefined in the Material and Site Improvement Manager), and a thickness.

Generated name: (strata name)

Classification: Unclassified

Type: Depth

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Each surface of this type represents a subsurface stratum of in situ, earthen material at the job site. Each material and the order of the strata are defined in the Define Strata command. The depth and thickness of each stratum is defined per drill hole in the Create Boring Logs command. Ideally, data from multiple boring logs should be used to create these depth surfaces. However, the number and distribution of boring logs needed to accurately represent strata on your site varies, depending on the rate of strata undulation in your region.