What's in a Level 3 Survey?

A Level 3 Survey, often referred to as a Topographic Survey or Site Survey, is a comprehensive and detailed mapping of a plot of land, including its natural and artificial features. It's a critical step in the planning and development process, providing a precise representation of the land's topography, boundaries, and improvements. But what exactly does a Level 3 Survey include? Let's delve into the details.

Level 3 Surveys are typically conducted using advanced technologies like GPS and LiDAR, ensuring high accuracy and precision. They are used for a wide range of applications, from construction planning to environmental impact assessments. But what sets them apart from lower-level surveys? Let's explore the key components of a Level 3 Survey.

Topographic Mapping

Topographic mapping is the core of a Level 3 Survey. It involves measuring and recording the elevation of points on a plot of land to create a detailed representation of its surface features. This includes natural features like hills, valleys, and water bodies, as well as man-made structures like buildings, roads, and fences.

Topographic maps are typically presented as contour maps, where lines of equal elevation are drawn to show the shape of the land. These maps are crucial for understanding the lay of the land and planning any earthwork or construction activities.

Contour Intervals

Contour intervals are the vertical distances between contour lines. In a Level 3 Survey, contour intervals are typically set at 0.5 feet or 1 foot, depending on the complexity and scale of the site. Smaller intervals provide more detail but can make the map more complex to read.

For instance, in a 10-acre site with significant elevation changes, a 1-foot contour interval might be used to capture the detail of the topography. However, in a flat area like a floodplain, a 5-foot contour interval might be sufficient.

Spot Elevations

Spot elevations are the precise vertical measurements of specific points on the land. They are typically shown as numbers on the topographic map and provide a quick reference for the elevation of key features like the tops of hills, the bottoms of valleys, or the tops of buildings.

In a Level 3 Survey, spot elevations are usually taken at significant changes in elevation, at the intersections of contours, and at the tops and bottoms of steep slopes. They are also taken at the corners of buildings and other structures to provide a precise record of their heights.

Boundary Survey

A Level 3 Survey also includes a boundary survey, which is a precise measurement and mapping of the boundaries of a parcel of land. This involves researching the legal description of the property, locating and measuring the corners of the parcel, and setting or recovering monuments at those corners.

Boundary surveys are crucial for establishing the legal limits of a property and ensuring that any improvements made to the land are within those limits. They are also used to resolve disputes between neighbors about property lines.

Monuments

Monuments are physical markers, usually made of iron or brass, that are set at the corners of a parcel of land to permanently mark its boundaries. In a Level 3 Survey, monuments are either set or recovered, depending on whether they already exist or not.

Monuments are typically set at the intersection of two property lines, and their locations are precisely measured and recorded. They are also described in the survey report to ensure that they can be found and identified in the future.

Legal Description

The legal description of a parcel of land is a written description of its boundaries and location. It is typically based on a system of surveys called the Public Land Survey System (PLSS), which was established by the U.S. government in the late 1700s.

In a Level 3 Survey, the legal description of the parcel is researched and included in the survey report. It is also used to ensure that the boundaries shown on the survey map match the legal boundaries of the property.

Improvement Locations

A Level 3 Survey also includes the precise locations of any improvements on the land, such as buildings, roads, fences, and utilities. This information is crucial for planning any new construction or improvements to the land.

Improvement locations are typically shown on the topographic map as symbols or hatch patterns, with their precise dimensions and locations recorded in the survey report.

Buildings

In a Level 3 Survey, the locations of all buildings on the property are measured and recorded. This includes the precise dimensions of the buildings, their locations relative to the property boundaries, and their elevations relative to the surrounding topography.

This information is crucial for planning any additions or modifications to the buildings, as well as for ensuring that they comply with local building codes and zoning regulations.

Utilities

The locations of any utilities on the property, such as water, sewer, gas, and electric lines, are also measured and recorded in a Level 3 Survey. This information is crucial for planning any earthwork or construction activities that could potentially damage these utilities.

Utilities are typically shown on the topographic map as dashed lines, with their types and approximate depths recorded in the survey report.

In conclusion, a Level 3 Survey is a comprehensive and detailed mapping of a plot of land, including its topography, boundaries, and improvements. It is a critical tool for planning and development, providing a precise record of the land's features and a foundation for any future work. If you're planning a construction project or need to understand the details of your property, a Level 3 Survey is an invaluable resource.