Trenches: Are linear excavations that are a maximum of 48" in width and 18" in height. Trenches are backfilled with one-inch stone containing a 4" perforated distribution pipe located 6" or 12" above the bottom of the trench. The distribution pipe is covered with a minimum 2" of stone.
A drainage (leaching) system which disperses the sewage effluent into the surrounding natural soils. There are many types of drainage systems. The specific type utilized on a particular property is usually dependent on the soil conditions that exist on the site. Most residential installations utilize stone-filled leaching trenches.
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