Recently, the DNR began to compile all research related to toxicity of chloride, sulfate and total dissolved solids. The purpose was to update and develop criteria for these parameters to better protect aquatic life based on new scientific information.

• Proposed Chloride and Sulfate Criteria Fact Sheet (*.pdf file)
  
  
• Water Quality Standards Review: Chloride, Sulfate and Total Dissolved Solids (*.pdf file)
  (Consultation Package Submitted to EPA 2/9/09)
  • Proposed Chloride Criteria Update (*.pdf file)
    (Sent to EPA on 3/2/09)
  
  
  
• Proposed Chloride and Sulfate Criteria Presentation (*.pdf file)
  
  
• Proposed Chloride Acute and Chronic Criteria Tables (*.pdf file)
  
  
• Proposed Sulfate Criteria Table (*.pdf file)

Chloride, Sulfate and Total Dissolved Solids Rulemaking Documents	*.pdf
Final Rule
Responsiveness Summary
NOIA
Fiscal Impact Statement

Public Hearing Schedule:
Any person may submit written suggestions or comments on the proposed amendments through August 14, 2009. Such written material should be submitted to Adam Schnieders, Iowa Department of Natural Resources, Wallace State Office Building, 502 East 9th Street, Des Moines, Iowa 50319-0034, fax (515)281-8895 or by E-mail to adam.schnieders@dnr.iowa.gov. Persons who have questions may contact Adam Schnieders at (515)281-7409.

Persons are invited to present oral or written comments at public hearings which will be held:

July 7, 2009	11 a.m.	Orange City Public Library 112 Albany Avenue SE, Orange City, IA - (No comments received)
July 7, 2009	6 p.m.	Spencer Public Library 21 E. 3rd St., Spencer, IA - (No comments received)
July 9, 2009	1 p.m.	Wallace State Office Building 502 E 9th St., Des Moines, IA - (Public Hearing Transcript,*pdf)
July 13, 2009	11 a.m.	Dubuque Public Library 360 W. 11th Street, Dubuque, IA - (No comments received)
July 13, 2009	6 p.m.	Iowa City Public Library 123 S. Linn Street, Iowa City, IA - (No comments received)
July 15, 2009	10 a.m.	Atlantic Public Library 507 Poplar Street, Atlantic, IA - (No comments received)
July 16, 2009	11 a.m.	Clear Lake Public Library 200 N. 4th St., Clear Lake, IA - (No comments received)

Public Hearing Participants,*pdf