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Free-Product Recovery of Petroleum Hydrocarbon Liquids

API 4682 – Free-Product Recovery of Petroleum Hydrocarbon Liquids

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This document addresses the application of proven technologies for recovering free-product petroleum releases to groundwater. An approach is given to optimize free-product recovery for minimal water production and free-product smearing. Information and guidance for design and analysis of free-product recovery systems using trenches, skimmer wells, single- and dual-pump wells, and vacuum-enhanced wells are provided. The principles that govern the distribution and movement of free-product petroleum hydrocarbons near the water table in an unconfined aquifer are reviewed.