![]() ![]() When you have laid the pipe and gravel, drape your cloth over it. Once the entire pipe is in place, fill the trench with another one to three inches of gravel and let the gravel work its way down around the pipe. Use the clamps to hold the pipe in place at the septic tank drain so it does not shift and misalign. Place the pipe from the septic tank all along each trench. Once the trenches are dug you will put at least 1-1 1/2 inches of gravel along the bottom of each trench. You do not want the wastewater to pool at the bottom and rise up. Make your trenches so they tilt downward slightly, but no more than a 1/4-inch incline for every eight feet you have. Each trench should be three to four feet wide and equally deep. You will need to dig either four two-foot long trenches or two 50-foot trenches for a 1,000-gallon septic tank. ![]() Send a sample to your local extension office or pick up a soil test kit here. It's best to find this out before you dig. If the absorption capacity is too low, you will have trouble with back-ups. Step 3 - Make Sure the Soil is AppropriateĮven if it's not required, have the soil tested in the area. Verify all of the relevant laws and regulations prior to starting this project. Digging the field is a lot of hard work, but having to remove it and start over again is even worse. Verify if you need a permit to build the septic tank drain field or if you need to have the site inspected prior to starting work. ![]()
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