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~I ~ S Q PEl{ A T ION AND ]\1 A 1 N TEN A NeE 35 groves causing the collapse of nearly two hundred mature trees. To maintain production at the highest level. a contract was author- ized to bud some three hundred of the remaining healthy, vigorous orange trees in this section to Eureka lemons during the summer of 1952. Two hundred fifty-seven young lemon and orange trees were planted to replace old nonproductive trees and those affected by quick decline. Light firing of orchard heaters was necessary on foul' nights to protect the lemon and orange crops from frost injury. Total income from the sale of oranges, lemons and walnuts for the fiscal year was $23,791.24, operating expense was $16,596.41, making a net profit for the year of $7,194.83. The net profit from the groves since they were purchased in July 1936 is $114,519.05. :1 II I \ lrC,IIIlIOl/fh softcHi-no and filfmtifJn plant The F. E. Weymonth softening and filtration plant was operated continuously during the fiscal year with the exception of three shutdown periods totaling 128 hours. These outages, planned to permit making service connections on the upper feeder east of the plant, were as follows: December 7-8, 1951 for Pomona Valley Municipal Water District at Fulton Road in La Verne; February 28-29, 1952 for Chino Ea:;in Municipal Water District at the steam plant of the Southern California Edison Company in Etiwanda; and April 21-23, 1952 for the Los Angeles County Flood Control District at B Street in La Verne. Colorado River water was softened from an average natural hardness of 312 parts per million to the desired finished water - - - -- ave.'aiellardness of 125parts liei=- million.- Partial lime treatmenC---- preceding softening by cation exchange was used for about 108 days during the year. In normal operation this treatment is used periodically to remove from the basins the gradual accumulation of organic matter. The unusually long period of lime treatment was necessary to overcome the adverse effect of t\\'O conditions on the quality of the plant influent water. During most of November and December partial lime softening was required as a result of unusnally heav.\' growths of plankton in Lake Mathews. Due to the presence of these organisms, the length of filter runs was seri- ously reduced prior to the use of coagulation. Further extensive use of lime treatment was necessary following the copiolls rains in January and March of 1952. The resulting heavy runoff carried an exces- sive load of suspended matter into Lake Mathews, creating a con-