Lake Orient IA 05-NOD-1396

Assessment Comments

Basis for Assessment

Used assessment of support of the Class B(LW) aquatic life uses developed for the 1994 report (=PS).   Lake was sampled in January 1995 as part of a study of herbicides in water and sediment from 19 Iowa water supply reserviors (UHL report 95-1 by Miller and Kennedy).   Water and sediment samples from the inlet and near the dam were analyzed for 8 common Iowa herbicides and two metabolites.   Only atrazine and desethyl- atrazine were detected in water; only alachlor was detected in sediment.   All concentrations were considered low for Iowa lakes and none approached MCLs.   Thus, assess support of the Class C drinking water uses as FST (even though the town of Orient now receives 100% of drinking water from the Greenfield Water Works).