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POST HOLES & TREE HOLE DIGGING - DRILLING |
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Drilling For Septic Tank and Soil Porosity Test Holes In the hill country, when planning a septic tank disposal system, the first thing to do is test soil porosity. With our 4 1/2" auger we make 6 to 10 holes uniformly distributed over the drain field site. The soil porosity test holes should be about as deep as the drain field trenches will be cut, probably in the 20" to 30" range. The inside of the holes are scraped and roughed up a bit to eliminate smeared surfaces that would alter the natural porosity. We put a 2" layer of gravel or sand in the bottom of the post hole. You will need to contact your utilities authority in the county in which your property resides in order to find the percolation rates they recommend. Once you have this information, you will fill the holes with water and keep them full for appx 12 hours before you begin the testing of the rate at which the water seeps out of the test hole. In some areas, the percolation rate is considered to be the time required for water to decline 1". If the rate is slower than 1" per hour, the area may not be suitable for a septic drain field. These test holes can be near impossible to create out in most areas of the Texas hill country. But the drilling rig we use will make short order of the task.
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