Ohio EPA is adding alum to Grand Lake St. Marys. Purpose: To try to reduce its phosphorus load. Is it helping? Grand Valley State University (Mich.) researcher Geraldine Nogaro speaks tomorrow at 3:30 p.m. as part of the Environmental Science Graduate Program’s spring seminar series. Free. 244 Kottman Hall, 2021 Coffey Road, on Ohio State’s Columbus campus. Video link to 121 Fisher Auditorium, 1680 Madison Ave., OARDC, Wooster.