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The facility maintenance crew completed the disassembly , renovation , and <br /> re-piping of the circulation system at Hoover Pool . This system has been <br /> particularly troublesome in the past and has required considerable mainten- <br /> ance resultant from leakage and breaks in the piping . The decision was made <br /> to replace as much of the galvanized systems with PVC ( plastic pipe ) to help <br /> eliminate the continual maintenance caused by corrosion both inside and out - <br /> side the galvanized system . <br /> The vandalizing of departmental sprinkler systems continues to be a major <br /> problem which requires constant maintenance and repair . For example , during <br /> the period of August 19 , 1975 until January 16 , 1976 there were a total of <br /> 185 sprinkler heads and risers which were either broken or stolen as a result <br /> of vandalism . The problem is particularly severe in the Redwood Shores area , <br /> where some 83 heads were involved , and in the downtown area , where 46 heads <br /> were involved . Red Morton Community Park is also receiving a high degree of <br /> vandalism with 22 heads damaged during this period . Every effort is being <br /> made to devise ways and means to reduce this damage . However , only minor <br /> success has been experienced thus far . <br /> Commensurate with the Department ' s efforts to maximize training as much as <br /> possible , Clifford Rifbjerg , Senior Park Craft Worker , Carold Heinkel , Build - <br /> ing Maintenance Man I , and Mike Payne , Gardener , attended a one-day seminar on <br /> the installation , repair and maintenance of automatic sprinkler systems <br /> sponsored by the Rainbird Irrigation Supply Company . <br />