R18-7-204. Background Remediation Standards

A. A person may elect to remediate to a background concentration for a contaminant. B. A person who conducts a remediation to a background concentration for a contaminant shall establish the background concentration using all of the following factors: 1. Site-specific historical information concerning land use. 2. Site-specific sampling of soils unaffected by a release, but having characteristics similar to those of the soils affected by the release. 3. Statistical analysis of background concentrations using the 95th percentile upper confidence limit.