Section Env-Wq 708.06 - Design and Layout of Chemical Feed Equipment: Storage Requirements 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:
(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;(b) Chemicals that are incompatible shall not be stored or handled together;(c) Liquid chemical storage tanks in excess of 55 gallons shall have a liquid level indicator and:(1) An overflow and a contained receiving basin; or(2) A drain capable of receiving and containing accidental spills or overflows equal in volume to 110 percent of the storage tank capacity;(d) All liquid chemical storage tanks shall be properly labeled;(e) The day tank or solution tank, if provided, shall provide a means to maintain a uniform solution strength;(f) Overflow pipes shall:(1) Have a submerged discharge to a containment vessel;(2) Be visible to the operator under normal operating conditions; and(3) Be marked to designate the pipe's origin tank and the chemical being conveyed;(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;(h) Carts, elevators, hoists, and other appropriate means for lifting chemical containers shall be provided;(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;(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;(k) Vents from feeders, storage facilities, and equipment exhaust shall discharge to the outside atmosphere above grade and away from air intakes; and(l) Interior floor drains in chemical storage areas shall discharge to a holding tank.N.H. Code Admin. R. Env-Wq 708.06
(See Revision Note at chapter heading for Env-Wq 700) #8590, eff 3-25-06
Amended byVolume XXXIV Number 46, Filed November 13, 2014, Proposed by #10693, Effective 10/15/2014, Expires10/15/2024.