Section 455H.202 - Background standards1. Methods to identify background standards shall be adopted by the commission after consideration of the joint recommendations of the department and the technical advisory committee.2. The demonstration that the affected area meets the background standard shall be documented by the participant in the following manner: a. Compliance with the background standard shall be demonstrated by collection and analysis of representative samples from environmental media of concern.b. A final report that documents compliance with the background standard shall be submitted to the department and shall include, as appropriate, all of the following:(1) A description of procedures and conclusions of the site investigation to characterize the nature, extent, direction, volume, and composition of hazardous substances.(2) The basis for selecting environmental media of concern, descriptions of removal or decontamination procedures performed in remediation, and summaries of sampling methodology and analytical results which demonstrate that the background standard has been complied with.(3) The basis for determining the background levels.