DES MOINES – The DNR will meet with technical scientific experts June 24 to discuss possible changes to copper criteria in Iowa’s water quality standards.
The DNR is considering the optional use of a new model, BLM, to develop site-specific water quality criteria for copper. The U.S. Environmental Protection Agency updated its2007 aquatic life freshwater quality criteria for copper using the Biotic Ligand Model, or BLM. The BLM is a metal bioavailability model that uses receiving waterbody characteristics and monitoring data to develop site-specific water quality criteria.
In order to offer the flexibility to use this optional model, the DNR must add this choice to its water quality standards through rulemaking. The DNR will begin this process by first meeting with DNR staff and technical scientific experts to work through draft sampling guidance.
This meeting will be held on June 24 from 9 a.m. to noon in conference room 5 East at the Wallace Building, 502 E. Ninth St. in Des Moines.
Once the proposed draft Biotic Ligand Model rule and associated draft guidance document are prepared, the DNR will begin formal rulemaking activities with public meetings and opportunities for public comment.
Questions about this process should be directed to Rochelle Weiss, DNR water quality standards coordinator, 515-281-4736, or Rochelle.Weiss@dnr.iowa.gov