Dickcissell Lake IA 04-UDM-1247

Assessment Comments

Assessment remains based on results of U.S. EPA/IDNR fish tissue (RAFT) monitoring in 2007

Basis for Assessment

SUMMARY: The Class B(LW) (aquatic life) uses remain "not assessed" due to a lack of information upon which to base an assessment.   The fish consumption uses remain assessed (monitored) as "fully supported.”  Sources of data for this assessment include: results of U.S.  EPA/IDNR fish tissue (RAFT) monitoring in 2007.  

EXPLANATION: Fish consumption uses remain assessed (monitored) as “fully supported” based on results of U.S.  EPA/IDNR fish contaminant (RAFT) monitoring at Dickcissell Lake in 2007.   The composite samples of fillets from channel catfish and largemouth bass had low levels of contaminants.   Levels of primary contaminants in the composite sample of channel catfish fillets were as follows: mercury: 0.0451 ppm; total PCBs: 0.09 ppm; and technical chlordane: <0.03 ppm.   Levels of primary contaminants in the composite sample of largemouth bass fillets were as follows: mercury: 0.181 ppm.   The existence of, or potential for, a fish consumption advisory is the basis for Section 305(b) assessments of the degree to which Iowa’s lakes and rivers support their fish consumption uses.    The fish contaminant data generated from the 2007 RAFT sampling conducted at this lake show that the levels of contaminants do not exceed any of the advisory trigger levels, thus indicating no justification for issuance of a consumption advisory for this waterbody.