PDFWAC 296-826-30045
Installation.
(1) You must provide a minimum distance of five feet between aboveground and underground containers that have more than a twelve hundred gallon capacity each.
(2) You must protect containers from floating away, in areas with a potential for high flood waters, by providing either:
(a) Secure anchorage; or
(b) Adequate pier height.
(3) You must follow Table 2 for aboveground, nonrefrigerated containers.
Table 2
Aboveground Nonrefrigerated Container Requirements
If you have: | Then: | |
Aboveground containers | Provide one of the following: | |
1. | Substantial reinforced concrete footings and foundations; or | |
2. | Structural steel supports mounted on reinforced concrete foundations. | |
Make sure the reinforced concrete foundation meets all of the following: | ||
1. | Extends below the established frost line. | |
2. | Is of sufficient width and thickness to support the total weight of the containers and contents. | |
3. | Has the lowest point of the tank at least 18 inches above the ground. | |
Make sure the footings meet all of the following: | ||
1. | Extend below the established frost line. | |
2. | Are of sufficient width and thickness to support the total weight of the containers and contents. | |
Floating type foundations on containers installed aboveground | Make sure they are designed to adequately support the tank, contents, and pumping equipment. | |
A horizontal, aboveground container | Mount the container on a foundation that permits expansion and contraction. | |
Prevent the weight of excessive loads from resting on the supporting portion of the shell. | ||
Provide saddle bearing that extends over at least 1/3 the circumference of the shell. | ||
Prevent corrosion on the portions of the container in contact with the foundations or saddles. | ||
(4) You must follow Table 3 for underground, nonrefrigerated containers.
Table 3
Underground Nonrefrigerated Container Requirements
If you have: | Then: | |
Underground containers | 1. | Set the containers on firm foundations or earth. |
2. | Surround containers with soft earth or sand well tamped into place. | |
3. | Make sure the top of the container is at least 1 foot below the surface of the ground. | |
4. | If ground conditions make this impractical, use precautions to prevent physical damage to the container. | |
Exemption: It is not necessary to cover the portion of the container where a manhole and other connections are attached. | ||
5. | Securely anchor or weight containers when necessary to prevent floating. | |
6. | Have a protective corrosion-resistant coating, applied before it is placed underground, that is both of the following: | |
a. | Satisfactory to the authority having jurisdiction; and | |
b. | Equal to either hot dip galvanizing or 2 preliminary coatings of red lead followed by a heavy coating of coal tar or asphalt. | |
7. | Lower containers onto firm foundations without damaging the protective corrosion-resistant coating. | |