In one of Jason Rainey's earliest recollections of life, he is standing in the Yuba River.Rainey will soon be standing in the river again, literally and for its ecologic and economic aspects, as the new executive director for The South Yuba River Citizens League. The 1990 Nevada Union High School graduate was announced as the new director Saturday night at SYRCL's annual Laura Wilcox Scholarship Fundraiser Quiz Night. Rainey replaces Janet Cohen, who received a standing ovation from the crowd.Rainey will begin his dream job March 28 after years of experience studying ecological and economic matters in Africa, South America …