Petroleum Release Site – Golden, CO Trap & Treat ® BOS 200 ® Notes: The goal of the project was to bring small petroleum surface spills affecting soils on the subject site to below the Colorado Department of Labor and Employment, Division of Oil and Public Safety (OPS) Tier 1 Risk-Based Screening Level (Threshold Limit Value) of 500 ppm. There was no groundwater impact at the site. As is shown in the chart below, the original

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