Assessment Comments

Assessment is based on results of IDNR ambient monthly monitoring south of Humboldt.

Basis for Assessment

SUMMARY:  Class B(WW) aquatic life uses were assessed as "fully supported."  EXPLANATION:  Based on results of monitoring at the DNR quarterly water quality monitoring station located south of Humboldt (station 444061), the Class B(WW) aquatic life uses were assessed as "fully supporting" due to lack of violations of Class B(WW) water quality criteria (1) for dissolved oxygen, pH, and ammonia-nitrogen in the eight samples and (2) for toxic metals in the two of these samples collected during the 1998-1999 biennial period.   This assessment was based on results of quarterly monitoring.   Results from stations monitored monthly or more frequently, however, are preferred for Section 305(b) assessments in order to increase the accuracy and confidence level of the assessment.   As part of DNR's expanded water quality monitoring program, monthly monitoring began at the Humboldt station in October 1999.