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A perc test takes an average of around two hours, but it can range from one hour up to around six hours. Perc tests that require wider or deeper holes and those that require multiple holes dug throughout your property will take longer because there’s more excavation involved. The actual filling of the hole and monitoring to gauge the rate of percolation should take under an hour per hole.

Yes, rain can affect the results of a perc test because it will partially saturate the soil and slow down the rate of drainage. Ideally, you should do a perc test during the driest time of the year and try to schedule it after a stretch of days where no precipitation occurs. This will give you the best chance of passing.

You should dig 3 to 6 inches deep for plastic edging. Dig as wide as you need to fit your plastic edging into it—2 inches is usually sufficient.

It depends on the model of your pool. You’ll always have to level the topsoil, but most vinyl-lined pools require an additional 1- to 2-inch layer of sand to protect the liner. This way, when a foot kicks down to the bottom of your pool, it’s not scraping the liner against the hard ground. If your pool isn’t vinyl-lined, you can skip this step or add a layer of another base material, like decomposed granite. Always check your manufacturer’s instructions before you begin.