Topsoil Type 4 is a more specialized topsoil mixture that has very high sand content and low organic matter which is compatible with the specialized management of the Premier Sports Fields (Irrigated, Subdrainage) end use (2b). The chemical and physical properties of this topsoil type have been adapted from the above stated resources with the addition of various sports field specifications. The subdrainage of this end use requires high percolating soils (maximum 15% silt and clay combined) with slightly lower organic matter (2 to 4%) and a C:N ratio of approximately 20:1 to 30:1 to allow for adequate moisture holding capacity, plant nutrients and compaction alleviation.