East Lake (Lenox) IA 05-PLA-1478

Assessment Comments

Monitored in 1993 and 1995 for Survey of Water Supply Reservoirs (Miller & Kennedy 1993, 1995).

Basis for Assessment

Used assessment of support of the Class C (drinking water) uses developed for the 1994 report (=FST), and used results of winter sampling for eight common agricultural herbicides at two locations (inlet and dam) in January 1995 to assess support of the Class C uses as again FST due to (1) levels of atrazine (0.32 and 0.34 ug/l, inlet/dam) that are lower that the average reportable concentration for the 19 water supply reservoirs sampled, (2) levels of cyanazine (0.61 to 0.68 ug/l, inlet and dam) that were approximately 1/2 the average reportable concentration, and (3) no violations of the MCL for atrazine.   Levels of atrazine and cyanazine appear to have decreased since the February 1993 sampling (Miller and Kennedy 1993).