Are there special requirements for the soil used in green infrastructure systems, or can I use topsoil?

There are specific requirements for “engineered soil” used in all types of bioretention systems, including rain gardens. Engineered soil is not topsoil. For specific guidance about soil mix, soil bed requirements, and best practices for soil amendments such as compost, consult Chapter 9.1 “Bioretention Systems” of the NJDEP Stormwater BMP Manual.

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