Pollution Abatement Division staff have been working with oil industry representatives, the American Petroleum Institute (API), and Risk Based Corrective Action (RBCA) experts to thoroughly revise our guidance for complex spills and discovered historic pollution. While the focus is on crude and condensate from production sites, pipelines, and tank farms, cleanup of refined hydrocarbons is also briefly discussed. There are seven steps from assessment through cleanup or stabilization to closure. A new TPH analytical method, similar to Texas method 1005 pushed to C35 but with 4 reporting ranges, is being developed by the Oklahoma State Department of Environmental Quality. There is also a revised brochure for reporting and responding to spills, which has guidance for immediate and short term response actions.

In this new system, operators can choose to follow the revised category/risk factor pathway, which has fixed numerical cleanup criteria; or can prove stabilization, with monitored natural attenuation for the "cleanup"; or can instead use a RBCA approach. The PERF group did a fractionation analyses of numerous crude oils and condensates from both Oklahoma and worldwide to determine their levels of potentially harmful compounds. The numerical category cleanup criteria and a new RBCA Tier 1 lookup table contain risk-related cleanup levels based on these analyses, as well as oil mobility limits in soils and the effects of crude and condensate in the root zone on plants. The guidance also specifies the software to be used (developed for Oklahoma by API) if a company decides to do a site specific Tier 2 or 3 RBCA.

Oklahoma Centennial Commemorative Medallion Design by Betty Price, Executive Director, Oklahoma Arts Council.

Oklahoma Centennial Commemorative Medallion Design by Betty Price, Executive Director, Oklahoma Arts Council.

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