Percival Lake IA 06-WED-1680

Assessment Comments

Assessment is based on results of U.S. EPA/IDNR fish contaminant monitoring conducted in 2001 for U.S. EPA's "National Lake Fish Tissue Study."

Basis for Assessment

SUMMARY:  The Class B(LW) aquatic life uses remain "not assessed" due to the lack of water quality information upon which to base an assessment.   Fish consumption uses are assessed (monitored) as "fully supported" based on results of fish contaminant monitoring conducted in August 2001 for U.S.  EPA’s National Lake Fish Tissue Study.

EXPLANATION:  The Class B(LW) aquatic life uses remain "not assessed" due to the lack of water quality information upon which to base an assessment.  

Fish consumption uses are assessed as "fully supported" based on results of fish contaminant monitoring conducted on August 13, 2001 as part of the U.S.  EPA's National Lake Fish Tissue Study.   Composite samples of common carp and largemouth bass were collected by the IDNR Fisheries Bureau; samples were analyzed by an independent laboratory under contract with U.S.  EPA.   Levels of contaminants in both samples were very low.   Neither sample contained levels of contaminants that approached even one-half the respective FDA ALs or IDNR levels of concern.   The level of mercury was 0.106 ppm in the composite sample of whole-fish common carp and was 0.313 ppm in the composite sample of largemouth bass fillets; the level of dieldrin was 0.037 ppm in the sample of whole-fish common carp and was 0.004 ppm in the sample of largemouth bass fillets;  PCBs (Aroclors) were not detected in either sample.