Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 653 - DESIGN, OPERATION AND MAINTENANCE CRITERIA
Subpart G - FLUORIDATION
Section 653.701 - Fluoridation - Engineering Design Criteria
Current through Register Vol. 48, No. 38, September 20, 2024
a) Procedure for Submitting Plans and Specifications - Design documents for fluoridation shall be prepared and submitted in accordance with 35 Ill. Adm. Code 602.
b) Basis of Design - Equipment shall have the capacity to maintain the fluoride content in the finished water between 0.9 and 1.2 mg/l.
c) Selection of Chemical - Fluoride compounds shall meet requirements of Section 653.202 and the AWWA Standards.
d) Chemical Feed Equipment - Feeders shall be accessible for repair and maintenance, protected against dust hazard and be accessible to the chemical storage area.
e) Point of Application - The point of fluoride application shall be selected to provide uniform fluoride concentrations in the distribution system. Fluoride solutions shall not be applied ahead of ion exchange or lime softening processes.
f) Operating Controls - Controls which eliminate any possible hazard of over-dosing shall be provided and operate feed equipment only when there is flow past the point of application. Automatic stop-start operation and proportional feeding shall be used. Separate equipment installations shall be used where fluoridation at a single point is not possible.
g) Back-Siphonage Safeguards - Anti-siphon devices shall be provided for all make-up and dilution water lines and on the discharge side of the chemical feeder. An air gap or a siphon breaker in compliance with Section 653.801(d) on the downstream side of the last control valve in the water supply line serving the feeder shall be provided.
h) Auxiliary Treatment - Water used for preparing batch solutions or used for dry feeders shall be softened or stablilized with polyphosphates if precipitation of fluoride compounds interferes with the accuracy of the fluoride feeding equipment.
i) Safety Items - Rubber gloves and a dust mask shall be provided with each installation using dry chemicals. Rubber gloves, acid-resistant aprons and protective goggles shall be provided where hydrofluosilicic acid solutions are fed.
j) Metering - Facilities shall be provided for metering the dilution water and the plant discharge to the distribution system.
k) Testing Equipment - Testing equipment for fluoride ion concentration determination shall be provided and shall be:
l) Sampling Taps - Sampling taps shall be provided and located such that representative samples can be obtained from: