This landscape detail shows the multi-layer soil profile for tree planting pits, starting with a maximum thirty-six-inch overall depth. A six-inch topsoil layer sits above the horticultural subsoil, with the surface scarified at the transition zone. Below the subsoil lies a four-inch layer of drain rock resting on a compacted subgrade.
36" Max. Topsoil Horticultural Subsoil 6" Scarify Surface at Transition Zone Drain Rock 4" Compacted Subgrade, See Civil Drawings
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