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Additional training was accomplished by Senior Park Craftworker Ode Touye <br /> attending a one day irrigation seminar in San Mateo on December 16 . This <br /> seminar dealt principally with the use of backflow prevention devices as <br /> well as current code requirements for installation of irrigation main <br /> lines , control valves and backflow prevention devices . Backflow preven- <br /> tion is an extremely important matter when dealing with irrigation systems . <br /> - 9- <br />