This bioretention soil profile consists of a two-inch layer of oystershell mulch at the surface above a six-inch layer of topsoil, with transition zones requiring scarified surfaces between layers. A two-foot six-inch layer of horticultural subsoil forms the primary bioretention soil depth, sitting atop stone coursings that contain a perforated underdrain. The entire assembly rests on a liner and subgrade specified per the geotechnical report and civil drawings.
6" 2'-6" 2" Horticultural Subsoil Oystershell Mulch Scarify Surface at Transition Zone Topsoil Scarify Surface at Transition Zone Stone Coursing, See Civil Drawings Underdrain Per Subgrade Geotech Report Bioretention Soil, Depth per Civil Liner per Civil
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