- a) Dikes shall be constructed of earth, clay, solid masonry or reinforced concrete not higher than one-half the height of the tank or tanks enclosed, so constructed as to afford protection from leaks, spills, or other discharge of product.
- b) Earthwork dikes shall be firmly and compactly built of good earth or clay, from which stones, vegetable matter and other foreign material have been removed. They shall have a flat section at the top not less than two and one-half feet wide and a slope of at least 1 to 1 (45º) on both sides.
- c) Masonry or concrete dikes shall have footings below the frost line.
- d) It is permissible to cover earthwork dikes with gravel or stones not larger than 2" in diameter.
- e) If a concrete floor covering is provided for the area enclosed by a concrete dike, a sump shall be provided at some convenient place, attached to which shall be a pump conforming to NFPA #70 (1984), Chapter 5, so that any accumulation of water or oil may be removed immediately.
(Source: Amended at 9 Ill. Reg. 10012, effective October 1, 1985)