Little River Watershed Lake IA 05-GRA-1358

Assessment Comments

Basis for Assessment

Used assessments of support of the Class A (primary contact) uses (=FS) and Class B(LW) aquatic life uses (=FS) developed for the 1994 report.   To assess support of the Class C (drinking water) uses, used assessment developed for the 1994 report (=FS) in combination with results of the January 1995 sampling for eight common agricultural herbicides as reported in Miller and Kennedy (1995) to assess support of the Class C uses as FS due to (1) levels of atrazine in the lake (0.  54 ug/l) less than the average reportable concentration (0.84 ug/l) for the 19 water supply reservoirs sampled, (0.76 ug/l also less than the average reportable concentration (1.03 ug/l) and (2) no violations of the atrazine MCL.   Fish consumption uses assessed as FS due to levels of all contam.  less than 1/2 FDA action levels in composite samples of channel cat and w.  crappie analyzed for the 1994 RAFT program.