Design Guide for Community Water Systems - The Water, Sanitation ...

m. Sampling taps. Sampling taps must be provided for the collection ofrepresentative samples. The taps shall be located to provide forsampling of the softener influent, effluent and blended water. Thesampling taps for the blended water shall be at least 20 feet downstreamfrom the point of blending. Sampling taps should be provided on thebrine tank discharge piping.n. Brine and salt storage tanks.1. Salt dissolving or brine tanks and wet salt storage tanks must becovered and must be corrosion-resistant.2. The make-up water inlet must be protected from backflow.Water for filling the tank should be distributed over the entiresurface by pipes above the maximum brine level in the tank. Thetanks should be provided with an automatic declining levelcontrol system on the make-up water line.3. Wet salt storage basins must be equipped with manholes orhatchways for access and for direct dumping of salt from truck orrailcar. Openings must be provided with raised curbs andwatertight covers having overlapping edges similar to thoserequired for finished water reservoirs.4. Overflow, where provided, must be protected with a corrosionresistant screen and must terminate with either a turned-downbend having a proper free fall discharge or a self-closing flapvalve.5. Two wet salt storage tanks or compartments designed to operateindependently should be provided.6. The salt shall be supported on graduated layers of gravel placedover a brine collection system.7. Alternative designs which are conducive to frequent cleaning ofthe wet salt storage tank may be considered.o. Salt and brine storage capacity. Total salt storage should havesufficient capacity to store in excess of 1½ carloads or truckloads ofsalt, and provide for at least 30 days of operation.p. Brine pump or eductor. An eductor may be used to transfer brine fromthe brine tank to the softeners. If a pump is used, a brine measuringtank or means of metering should be provided to obtain proper dilution.q. Stabilization. Stabilization for corrosion control shall be provided. Analkali feeder shall be provided except when exempted by thedepartment.r. Waste disposal. Disposal of brine waste must be in accordance withClean Water Commission Regulations.s. Construction materials. Pipes and contact materials must be resistant tothe aggressiveness of salt. Plastic and red brass are acceptable pipingmaterials. Steel and concrete must be coated with a non-leachingprotective coating which is compatible with salt and brine.Aug. 29, 2003Page 75