Petroleum Hydrocarbons and Organic Chemicals in Ground Water: Prevention, Detection, and Remediation® Conference

Tuesday, November 4, 2008 : 1:30 p.m.

Implementation of Biologically Enhanced Soil Vapor Extraction: Overcoming Obstacles to Remediate 46 Acres of Petroleum Hydrocarbons

Robert J. Frank, RG, CH2M HILL

Past releases of jet fuel from underground storage tanks and pipelines at an aircraft engines manufacturing and testing facility created a 46-acre zone of free-product jet fuel beneath the Site. Due to substantial vadose zone contamination and a dramatically falling water table, biologically-enhanced soil-vapor extraction (BSVE) was proposed to the regulatory agency as the remedial alternative. Following numerous working meetings between the parties, BSVE was approved in October 2005. 

The Site is a 57-year-old facility with over 130 manufacturing, testing, storage, and administrative buildings, as well as an extensive network of subsurface utilities. The target treatment area for the BSVE system is approximately 77 acres and includes the most active areas of the Site and a portion of an adjoining international airport. The Site is also part of a regional groundwater Superfund Site and has active public involvement on both the Superfund investigation and jet fuel remedy. In addition to the physical constraints, an abnormally wet winter in 2005 caused a substantial rise in the local water table, trapping a portion of the free product and submerging some of the well screens, further complicating implementation of the system. An amendment to the Facility’s Title V permit was also required for system operation, and because some chlorinated solvents are entrained within the free product, the vapor-phase treatment train needed special design to mitigate VOC emissions from the system. After a lengthy design and review process, including significant public involvement, the amendment to the Title V permit was issued in early 2008.

Despite the complex technical issues and regulatory environment, the design of the BSVE system was recently completed and construction began in April 2008, with initial operation anticipated to commence this year. This paper will explore the various physical and technical obstacles that have been overcome to implement the selected remedy.

Robert J. Frank, RG, CH2M HILL Robert J. Frank, R.G. is a senior hydrogeologist at CH2M HILL in Tempe, Arizona. He is a registered geologist in the State of Arizona and holds an M.S. degree in hydrogeology from San Diego State University. His research interests and project experience focus on distribution, mobility, and remediation of petroleum hydrocarbons and chlorinated solvents in the subsurface. Mr. Frank also serves on the State of Arizona’s Underground Storage Tank Technical Appeals Panel under appointment by the Governor of Arizona. Robert can be reached at CH2M HILL, 2625 South Plaza Drive, Suite 300, Tempe, Arizona 85282; telephone (480) 295-3927; email: Robert.Frank@ch2m.com.


Petroleum Hydrocarbons and Organic Chemicals in Ground Water: Prevention, Detection, and Remediation® Conference