A. Embankments: Embankments or dikes are required:
1. For each tank containing crude oil or other liquid which has a tendency to boil-over.
2. For each individual tank exceeding fifty thousand (50,000) gallons (1,200 barrels) in capacity.
3. For individual tanks of less than fifty thousand (50,000) gallons, or groups of tanks with individual tank capacity of less than fifty thousand (50,000) gallons, when installed.
4. On the bank of a stream or other body of water, or on land permitting of rapid drainage thereto.
5. When, due to any other special conditions, the Village President and Board of Trustees deems diking to be necessary for the protection of other property. (1968 Code, §21.127)
B. Capacity of Dikes:
1. Dikes for refined petroleum products not subject to boil-over shall have a capacity of not less than the capacity of the tank or groups of tanks surrounded.
2. Dikes surrounding tanks containing crude oil or other flammable liquid subject to boil-over shall have a capacity of not less than the capacity of the tank surrounded and in addition shall have a suitable coping or deflector pointing inward, so designed and constructed as to minimize the effect of the boil-over wave. Dike shall be not less than fifty feet (50') from the shell of the tank surrounded. (1968 Code, §21.128)
C. Material and Construction of Dikes: Dikes shall be constructed of earth, clay masonry or reinforced concrete not higher than one-half (1/2) the height of the tank or tanks enclosed, so constructed as to afford adequate protection.
Earthwork embankments shall be firmly and compactly built of good earth or clay, free from stones, vegetable matter and other foreign material. They shall have a flat section at the top of not less than two and one-half feet (21/2
')
wide and a slope of at least one to one (45°) on both sides.
Masonry or concrete dikes shall have footing below the frost line.
If 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 of approved design, so that any accumulation of water or oil may be removed immediately. (1968 Code, §21.129)
D. No Openings in Dikes Permitted: Embankments or dikes shall be continuous, with no openings or piping or roadway. (1968 Code, §21.130)