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Take out any sticks, twigs or odd-sized stones. This will help to eliminate air pockets and uneven concrete surfaces. To ensure that the ground is flat, use a 48-72-inch-long level. Adjust the grading by moving the soil with a shovel, and then test the level again.
By using a hand tamper to compress the subgrade (the soil or earth that lies beneath a layer of gravel), you can compact it. The flat-bottomed plate has a broom-length, upright handle that allows you to add weight by pressing down on it or standing on top of it. To prevent concrete cracking, apply the hand tamper evenly to the entire area.
Next, you will need to build a form around your site. Concrete will be placed inside the form. To create a linear shape, you will need standard lumber such as 1x4 boards and duplex nails. These have two heads which make it easier to remove them when the concrete has cured. A piece of synthetic siding can be used to create a strong organic shape if a curve is present in the pour.
Use the level after the concrete form has been constructed to ensure that it is even in height. This is crucial as the final concrete stage will require level concrete. To strengthen the shape, add a board to reinforce the joints. Before moving on, make sure the form is level.