If not utilized immediately, the A horizon specified in § 89.131(b) (relating to soil removal) and the B horizon or other suitable soil materials specified in § 89.131(c) and (d) shall be stored separately from each other and from spoil. These stockpiles shall be placed within the permit area where they are not disturbed or exposed to excessive water or wind erosion before the stockpiled horizons can be redistributed. Stockpiles in place for more than 30 days shall meet the requirements of § 89.22(e) (relating to topsoil removal and storage).
25 Pa. Code § 89.132
This section cited in 25 Pa. Code § 89.122 (relating to prime farmlands).