J_2024 05 09_West Orange Stormwater Management Plan

o Mixture of the planting soil consists of 85-95% of sand, with no more than 25% of the sands as fine or very fine sands; no more than 15% silt and clay with 2% to 5% clay content). The organic matter shall be within 3% to 7%. (775423r0) o The pH of the planting soil should be in the range of 5.5 and 6.5. o Filter fabric is not placed along the sides of the soil planting bed. o The system is designed with a planting soil permeability rate of 1 inches/hour (pre-construction) and __________ inches/hour (post-construction – tested on (MM) / (DD) / (YYYY) ). o 3. Outlet Information: Outlet Outlet Type Orifice Size / Weir Length Invert Elevation Description Orifice Orifice 2.5” DIA 162.50 Orifice Orifice 12” DIA 164.50 Outlet Pipe Outlet Pipe 18” DIA 162.50 (Other) 4. Vegetation o The vegetation type to be used in this bioretention system is site-tolerant grasses. A Landscaping Plan should be included in the Reference Documents section of this field manual. For a bioretention system designed with an underdrain, the following also applies. 5. Underdrain o The perforated laterals are ____6____ inches in diameter, at a slope of 0.50%. o There are 4 lateral pipes in the basin. Each lateral is approximately 12 feet long. o The perforations are 0.25 inches in diameter and designed per ASTM D2729. o The gravel layer surrounding the underdrain consists of 3 inches of gravel above the underdrain and 3 inches of gravel below the underdrain. Critical Maintenance Features 1. No heavy equipment on the basin surface. 2. Remove vegetation strictly in accordance with the landscaping plan. 3. Grass clippings shall be collected from the basin and properly disposed. 4. Keep the appearance of the basin aesthetic. 5. The system of pop-up drainage emitters and perforated dispersion pipes shall be inspected for blockages when the bioretention basins are inspected. April 2015 Bioretention System Page 23/49