// CODE SNIPPET
406.4 Percolation Rate, Seepage Pit
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Percolation tests shall be made in each horizon penetrated below the inlet pipe for a seepage pit. Soil strata in which the percolation rates are slower than 30 minutes per 1 inch (25 mm) shall not be included in computing the absorption area. The slowest percolation rate shall be used to determine the absorption area.