020-1 Wyo. Code R. §§ 1-43 - Default Organic Compound and Total Petroleum Hydrocarbon Soil Cleanup Concentrations
When site-specific geological data/information are not available to calculate soil cleanup concentrations, default remediation standards shall be used. Default remediation standards shall be based on exposure of the most sensitive receptor using both oral ingestion and inhalation pathways and the potential for soil contamination to migrate to groundwater. The default soil condition for organic compounds has been established as a sandy clay formation with a minimal organic carbon content of 0.1% and a depth to the first groundwater table from the bottom of the default contaminated soil zone equal to 1 foot. The default thickness of contaminated soil is 5 feet. The annual precipitation rate is 14 inches per year with a 50% infiltration rate. These conservative default soil conditions indicate residential exposures with protection of groundwater quality to EPA/STP MCLs or DWELs.
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