Risk-based Standards for Kansas Manual



Risk-based Standards for Kansas

RSK Manual - 5th Version

October 2010

Revised Tables - March 2014


KDHE/BER has updated the Appendices of the 2010 RSK Manual. The new Appendices, dated March 2014, include the following modifications:

  • Aniline, trivalent chromium, cyclohexane, cyclohexylamine, dinoseb, tetrahydrofuran, and 1-methylnaphthalene have been added to the list of contaminants.
  • Dimethylphthalate has been removed from the list of contaminants.
  • The values for n-butylbenzene; sec-butylbenzene; chlorpyrifos; cyanide - free; cis-1,2-dichloroethylene; 2,6-dinitrotoluene; 1,4-dioxane; dioxin; hexachloroethane; methylene chloride; 4-methylphenol; pentachlorophenol; tetrachloroethylene; 1,1,2-trichloroethane; and trichloroethylene have been modified to reflect a change in toxicity values.
  • The arsenic soil pathway values in Appendix A have been recalculated using a 60% relative bioavailability for ingestion.

Any questions regarding these changes and their effects on the management of a contaminated site may be directed to the KDHE project manager.

Risk Based Standards for Kansas BACKGROUND: The Risk-based Standards for Kansas (RSK) Manual was originally developed in March 1999. Chemical-specific and media-specific risk-based cleanup goals were calculated using guidance and directives from the United States Environmental Protection Agency and various other technical resources. Prior to initial development of the RSK Manual, an Environmental Workgroup was established consisting of members of industry and the public to assist in determining appropriate risk-based cleanup levels. The risk-based cleanup levels determined by the Environmental Workgroup are incorporated into the RSK Manual. The RSK Manual is used to fairly and consistently address contaminated sites in Kansas.

LIMITATIONS ON USE: The RSK Manual is only applicable to contaminated properties or sites that are participating in appropriate state cleanup programs. KDHE project managers will work with the public and industry to ensure appropriate application of this guidance. Tier 2 risk-based cleanup levels defined in the RSK Manual are applicable for a single contaminant, in a single medium, under standard and conservative default exposure assumptions. Tier 2 risk-based cleanup levels have several additional limitations. Specifically excluded from consideration are transfers of contaminants from soil to air, cumulative risk from multiple contaminants or media, and risk to ecological receptors.

The RSK document should not be used for environmental audits, environmental assessments, or other non-KDHE managed activities. Use of Tier 2 risk-based values established within the RSK Manual without KDHE oversight may constitute misapplication of the RSK manual and may result in risk management decisions not supported by KDHE. The RSK Manual is not intended for use by environmental consultants on contaminated sites in the State of Kansas that are not participating in a KDHE cleanup program.