General equipment design shall meet the following criteria so as to allow for the continuous supply of accurate amounts and rates of chemicals throughout the range of feed requirements:

1. (a) Materials and surfaces that will come in contact with chemicals or solutions thereof shall be resistant to the chemicals and their solutions, with corrosive chemicals being introduced in a way that minimizes the potential for corrosion;
2. (b) Chemicals that are incompatible shall not be stored or handled together;

3. (c) Liquid chemical storage tanks in excess of 55 gallons shall have a liquid level indicator and:

   1. (1) An overflow and a contained receiving basin; or
   2. (2) A drain capable of receiving and containing accidental spills or overflows equal in volume to 110 percent of the storage tank capacity;
4. (d) All liquid chemical storage tanks shall be properly labeled;
5. (e) The day tank or solution tank, if provided, shall provide a means to maintain a uniform solution strength;

6. (f) Overflow pipes shall:

   1. (1) Have a submerged discharge to a containment vessel;
   2. (2) Be visible to the operator under normal operating conditions; and
   3. (3) Be marked to designate the pipe’s origin tank and the chemical being conveyed;
7. (g) Acid storage tanks shall be vented to the outside atmosphere, with each tank having a separate vent and a valved drain to protect against backflow;
8. (h) Carts, elevators, hoists, and other appropriate means for lifting chemical containers shall be provided;
9. (i) Provision shall be made for the proper transfer of dry chemicals from shipping containers to storage bins or hoppers, in a way that minimizes dust entering the room where the equipment is installed;
10. (j) Ventilation or personal protection, or both, shall be provided to prevent operator exposure to dust and chemicals, whether in the storage, transfer, or application areas;
11. (k) Vents from feeders, storage facilities, and equipment exhaust shall discharge to the outside atmosphere above grade and away from air intakes; and
12. (l) Interior floor drains in chemical storage areas shall discharge to a holding tank.

Source. (See Revision Note at chapter heading for Env-Wq 700) #8590, eff 3-25-06; ss by #10693, eff 10-15-14; ss by #14258, eff 7-1-25, EXPIRES: 7-1-35