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Case Study for Selection of Technologies to Remediate Soil and Groundwater Containing Gas Condensate, West Panhandle Field, Texas

J. David Mohrbacher P.E.1, Brent Miller, P.E.2, and Mike Jacobs, P.G.3
1 URS Corporation, Denver, Colorado
2 ERM Corporation, Seattle, Washington
3 Pioneer Natural Resources USA Inc, Midland, Texas

Assessment of soil and groundwater at several gas compressor production facilities was completed in 2003 following purchase of gas production operated since the 1950s. Limited amount of non-aqueous phase liquids (NAPL) were observed on groundwater at two sites. Petroleum hydrocarbons were observed in groundwater and dissolved benzene concentration exceeding drinking water standards were observed in groundwater at a total of six sites. Groundwater depths at these sites varied from approximately 20 to 40 feet below ground surface. As a result, remediation was implemented as part of the Voluntary Remediation Program administered by the Railroad Commission of Texas.

In 2004, Pioneer Natural Resources USA, Inc. evaluated a variety of air sparing and soil vapor extraction approaches to achieve cost effective cleanup of soil and groundwater. Simple bioventing systems were implemented at three facilities in 2004. Air sparging and vapor extraction are being evaluated for use at the remaining sites. This presentation will provide details regarding the selection and design of systems.