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Landscape & Design

By Sophie Rhéaume • May 2, 2018

How to Plan an Excavation – Part 1

Techo-Bloc

Paver Pete reviews the plan of a slab installation project with Kevin from Carroll Landscaping before the excavation. 

 

Instead of starting to dig right away, it’s important to plan excavation.

Evaluating the existing conditions helps identify the necessary information to estimate the quantities of material that will be removed during excavation as well as what will need to be delivered.

For this slab installation project, we have multiple elevations to manage.

tgsaht

We have a composite wood deck, an upper paver surface, and a lower section that can be reached by going down a set of steps.

The hardscape area will be supported with a retaining wall.

To better understand the work required, we divided the project into 3 sections.

plan with 3 sect

In blue, we have the upper section, in green, the set of steps and in orange, the lower section.

Then, we added measurements to the plan and the position of our stakes.

JTDKJYY-1

BM represents our benchmark. It’s positioned at the main door and has an elevation of zero because it never moves.

Stake 1 and Stake 2 represent where the pavement is going to reach the foundation wall of the house.

The pavement will be placed half an inch lower than the doorsill since we are in a freeze-thaw susceptible climate with a deep frost line.

We marked the position of the drain as well. The pitch will direct the water to that drain, and eventually out into the environment.

From this drawing, we added measurements to a grading plan.

plan

We have the existing conditions, finished grade at 0-0.5, top of base and bottom of excavation.

We also have the drain at stake 8.

The drawing and the grading plan can now be brought to the jobsite and be given to the foreman and their crew. It’s better to laminate the documents, or place them in a transparent plastic sleeve, to prevent any damage.

Now, we are ready to mark out the project and have full visibility over the depth of excavation across all tiers of the project.

 

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