ADBNet

Assessment Comments

Assessment based on results of a 1995 survey of Iowa water supply reservoirs (Miller and Kennedy (1995).

Basis for Assessment

Used results of sampling on January 10, 1995 for eight common agricultural herbicides as reported in Miller and Kennedy (1995) to continue to assess support of the Class C (drinking water) uses as FST due to (1) levels of atrazine (0.66 and 0.82 ug/l, dam and inlet) similar to average level for all 19 reservoirs in this study and (2) lack of violations of the MCL for atrazine.   Atrazine levels in 1995 were higher than in 1993 (0.16 and 0.19 ug/l, inlet and dam).   Levels of cyanazine in 1995 (1.4 and 1.1 ug/l, inlet and dam) were slightly higher than the overall average for the 19 reservoirs.  Used information in "Adams County Three Lakes Water Quality Project" application submitted by the Adams County Soil and Water Conservation District to DNR in March 1996 to assess support of the Class B(LW) uses as PS due to impacts of sediment eroded from agricultural lands in the watershed.   Application does not indicate any specific problems with the use of this lake as a source of potable water.   Lakes Icaria and West Corning are also included in the project.