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Arnold Lyle “Arnie” Aspelin, 75, of Fort Washington died from cancer Nov. 17, 2012, at Washington Hospital Center.

He was born Jan. 13, 1937, in Slayton, Minn.

In 1958, he earned a bachelor of science degree in agricultural education from South Dakota State University, where he earned a master’s in agricultural economics in 1960. In 1964, he earned a doctorate in agricultural economics with an economics minor from the University of Nebraska.

He worked as an economist for the U.S. Department of Agriculture in Washington, D.C., from 1964 to 1972. He was a part-time instructor in the economics department at Howard University from 1967 to 1973. He was the acting director of economic analysis for the Office of Hazardous Materials Control for the U.S. Environmental Protection Agency from 1972 to 1973. He was chief of the economic analysis branch of the pesticides program at EPA from 1973 to 1993. He was the senior economic adviser of the biology and economics division of the pesticides program for EPA from 1993 to 2000, when he retired.

He was interested in the promotion and improvement of largemouth bass fishing within the Southern Maryland area. Starting in 1975, he helped promote the assessment and tracking of the water quality of the Upper Potomac River. His team approach and efforts resulted in the Potomac River being reopened for the harvesting of largemouth bass after decades of a closed resource and allowed for the return of freshwater sport fishing in the Potomac River.

He is survived by his wife, Betty Jean Aspelin; his children, Kurt D. Aspelin (Kimberly) and Lori J. Shilling (Charles) of St. Mary’s County; grandchildren, Brett and Daniel Shilling of St. Mary’s County; and step-grandchildren, Justin and Courtney Gamble. The oldest of five siblings, he is survived by his brother and sister, Bruce Aspelin and Jean Wendland; and also by many nieces, nephews and other relatives and friends.

Relatives and friends are invited to a life celebration on Thursday, Nov. 29, from 2 to 4 p.m. and from 7 to 9 p.m. at George P. Kalas Funeral Home in Oxon Hill. Funeral services will be held Friday, Nov. 30, at 11 a.m. at Grace Lutheran Church in Fort Washington. Interment will follow at Resurrection Cemetery.