Assessment Comments
Sampled as part of the Iowa RAFT program in 1988, 1990, 1992, and 1994.
Basis for Assessment
Continued to assess support of fish consumption uses as NS due to continued existence of the fish consumption advisory issued in March 1986. Sampling for the 1996 Regional Ambient Fish Tissue (RAFT) monitoring program showed that (1) levels of all contaminants in the composite sample of largemouth bass fillets were very low and well below 1/2 of the respective FDA action levels and (2) levels of technical chlordane in the composite sample of carp fillets (0.18 mg/kg wet weight (=ppm)) exceeded 1/2 the FDA action level of (0.300 ppm) while the level of total PCBs (0.295 ppm) was less than 1/2 the FDA action level of 2.0 ppm. Additional sampling will be conducted to determine whether to lift the fish consumption advisory. A fish kill was reported at Cedar Lake on May 19, 1995. An estimated 300 fish were killed. No source or cause of this kill was identified. An additional kill was reported on April 24, 1997. An estimated 24 fish were killed; the cause of the kill was identified as furfural, low pH, and high water temperatures; the source was identified as industrial.
