Client: Confidential
Location: South Central Wyoming
Project Overview: Since 1991, Trihydro has been implementing a RCRA Facility Investigation (RFI) at a petroleum refinery in south central Wyoming. The RFI consists of an extensive assessment of environmental conditions throughout the facility; including installation of boreholes, test-pits, monitoring wells; groundwater monitoring, soil sampling, surface water sampling, vegetation sampling, and a thorough evaluation of historic operational practices. Results of the RFI are being used to develop a conceptual site model and conduct an environmental/human health risk-assessment.

Additionally, the results of the RFI will be used to focus, design, implement, and evaluate an appropriate remedial/reclamation program for the site (Corrective Measures Study). Surficial soil, surface water, and terrestrial vegetation sampling programs are further discussed below. The existing surface water drainages of the facility were inspected to determine potential for offsite runoff. In conjunction with the drainage evaluation, surface soil samples were collected at designated locations to evaluate the potential for current/historic contaminant migration.

The samples were analyzed for target constituents based on an evaluation of historical data and site activities. The surface soil samples were collected from down-wind and/or downdrainage potential source areas to evaluate onsite and offsite properties for potential soil contaminants above EPA soil screening criteria or site background concentrations. Surficial soil samples were collected from six inches below ground surface using USEPA/WDEQ approved procedures.