Nishnabotna River IA 05-NSH-1412

Assessment Comments

Assessment is based on results of U.S. EPA/IDNR fish tissue (RAFT) monitoring in 2002.

Basis for Assessment

SUMMARY:  The Class B(WW) aquatic life uses remain "not assessed."  Fish consumption uses are assessed (monitored) as "fully supported" based on results of U.S.  EPA / IDNR fish contaminant (RAFT) monitoring in 2002.  

EXPLANATION:  The Class B(WW) uses remain "not assessed" due to the lack of water quality data or other water quality information upon which to base an assessment (see assessment for the 2000 report).   Fish consumption uses are assessed as "fully supported" based on results of the U.S.  EPA/IDNR fish tissue (RAFT) monitoring near Hamburg in 2002.   The composite samples of fillets from common carp from this site had very low levels of contaminants (a predator species was not available at this site).   Levels of contaminants in this sample did not approach even one-half the respective FDA action levels or IDNR levels of concern.   Levels of primary contaminants in the composite sample of common carp fillets were as follows: mercury: 0.085 ppm; total PCBs: <0.093 ppm; and technical chlordane: 0.030 ppm.