Topsoil Stripping and Stockpile Documentation for Land Development

Topsoil stripping documentation is required for three overlapping reasons on most land development projects:

• Grading permit conditions. Most grading permits issued for land disturbance over one acre include a condition requiring topsoil preservation and reuse. The building or planning department will request evidence of reuse before issuing final grading approval.
• SWPPP compliance. Stormwater Pollution Prevention Plans (SWPPPs) typically include topsoil preservation as a best management practice (BMP). The SWPPP record-keeper needs documentation that the BMP was implemented.
• Payment disputes. On contracts with separate pay items for topsoil stripping, stockpiling, and respread, the volume documentation is the basis for payment. Without it, the owner can dispute the quantities.

The pre-strip survey is the baseline from which strip depth and volume are calculated. Take this survey before any grading equipment disturbs the site. It does not need to be a formal topo — a GPS rover shooting points on a 50-ft grid is sufficient for most projects.

Key data to capture in the pre-strip survey:

1. Existing ground elevations on a 50-ft grid across the stripping area
2. Location and depth of any shallow utilities that could affect strip depth
3. Existing vegetation type and density (photographic record)
4. Approximate topsoil depth (from probe or test pits) at representative locations across the site
5. Areas of shallow bedrock or subgrade that will limit strip depth

A topsoil probe record is particularly valuable. Probe at least one point per acre across the site, record the depth to subsoil (color and texture change), and include this data in the pre-strip documentation package.

After stripping, verify that the specified depth was achieved. On projects with a 6-inch minimum strip requirement, the stripped surface should be at least 0.50 ft below the pre-strip survey elevation at each grid point.

Strip depth verification methods:

The topsoil stockpile must be surveyed and documented separately from the stripping operation. Key requirements:

• Establish the stockpile location on the site plan. The permit authority needs to confirm the stockpile is outside setbacks and not within a drainage path or floodplain.
• Survey the stockpile base before placement and the pile surface after each major addition. Use cross-section survey or photogrammetry.
• Document the total volume in the stockpile at key project milestones: immediately after initial stripping, before any respread operations, and after final respread.
• If topsoil is hauled off-site (for disposal or sale), record truck count and estimated tonnage, destination, and receiving party documentation.
• Note the depth of the stockpile relative to maximum allowable height in your jurisdiction (typically 10-15 ft to maintain slope stability).

Most grading permits require the contractor to demonstrate that stripped topsoil was respread on the disturbed area prior to final landscaping. The reuse documentation package typically includes:

1. A site plan or sketch showing the topsoil respread areas with approximate thickness
2. Date of respread operations and the areas covered per day or week
3. Post-respread elevation shots at key points, confirming the specified respread depth (typically 4-6 inches)
4. A comparison of the volume stripped, the volume stockpiled, the volume respread, and any volume disposed of or removed from the site — these must reconcile
5. Photographs of the respread topsoil surface before final seeding or landscaping