UNION - Joseph Preston Allen, 26, died Saturday, Aug. 14, 1999, at Union. Born Nov. 22, 1972, in Honolulu, Hawaii, he was the son of R. Michael and Rebecca Hammack Allen of Union. Mr. Allen was a 1990 graduate of Union High School at Union, was a member of the Sierra Club and was an outdoor enthusiast. He had spent the last two years in Columbia, Md. Other survivors include his paternal grandparents, Nevitt and Dorothy Sibold Allen of Union; his maternal grandparents, John D. and Wilma Board Hammack of Lewisburg; several aunts, uncles and cousins. Friends may call 5 to 9 p.m. Saturday at the Groves Funeral Home, Union. The family requests that donations of sympathy be made to the Sierra Club, 85 Second St., 2nd Floor, San Francisco, CA 94105-3441. Arrangements by Groves Funeral Home, Union.