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<br />. .-....., <br />~..j L <br />36 <br /> <br />METROPOLITAN WATER DISTRICT <br /> <br />dition of high turbidity in the reservoir water. Much of this sus- <br />pended matter was almost colloidal in nature, tending to remain <br />in suspension for prolonged periods and passing through the sand <br />filters at the plant if coagulation was not used for its removal. <br />A new peak flow through the plant was reached on August 8, <br />1951, when a flow of 321 cubic feet per second, or 207.5 mi\1ion <br />gallons per da;', was maintaincd for 11 hours. This is slightly <br />above the present designed capacity of 200 million gallons per day. <br />The monthly average rate of flow ranged from a maximum in August <br />1951, of 273.5 cubic feet pel' second, or 176.8 million gallons per <br />day, to a minimum of 56.2 cubic feet per second, or 36.3 million <br />gallons per day, in January 1952. The average daily flow through <br />the plant for the fiscal year 1951-52 was 126 cubic feet per second, <br />or 81.4 million gallons per day. <br /> <br />j}!a-nt }//o/lIil://OIU:C 01/d rqJl1il' <br /> <br />With one exception the maintenance of equipment in service <br />proceeded throughout the fiscal year with only normal repair and <br />replacement. The original boiler and building heating facilities had <br />deteriorated to such an extent that replacement became necessary. <br />An Ames 125-hp, I5-lb workiug pressure steam boiler with auto- <br />matic fire control has been installed. The unit is complete with <br />condensate retul'll pumps, feed water preheater, and flue gas <br />cooler. A water heater with live steam coils having sufficient <br />capacity to care for the ultimate plant needs has been added. By <br />the use of completely demineralized water in a closed circulating <br />system the difficulties previously encountered will be eliminated. <br />Tanks have been provided for the storage of propane gas for a <br />stand-by fuel. <br /> <br />Chem/clll,.. {/Jul !WlfCr for plaut opcratio/1 <br />A total of 853 carloads and 134 truckloads of chemicals was <br />delh'ered and unloaded at the softening plant for use in the treat- <br />ment process. Included were 1327 tons of lime, 49,382 tons of <br />sodium chloride, 279 tons of liquid chlorine, 64 tons of sodium sili- <br />cate, and 25 tons of sodium hexametaphosphate. <br />Lime, sodium silicate, and sodium hexametaphosphate were <br />procured under purchase order when required. Deliveries of so- <br />(lium chloride necessary for regeneration of the cation exchange <br />softener units were continued under the three-year contract <br />