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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.

Yes, you can rent a rototiller for around $60 per day and do the work yourself, but it’s not recommended. Tilling is more of an art than a science, as tilling too deep can be detrimental to your soil structure and the organic matter that is beneficial to plants and shrubs, and tilling too shallow won’t properly introduce fertilizer or break up the soil for rooting plants. Additionally, tillers are powerful machines with sharp blades to cut through small roots and soil, so they are inherently dangerous to use. It’s usually worth it to hire a professional rototiller.

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.

While some areas may allow for a slope of up to 20%, this is often the maximum slope for driveways, with a few exceptions of up to 25%. Other regions may have a maximum of 12%, 15%, or 18%, so check with your local building department to ensure you’re laying a driveway that is up to code for your location.