Results of Soil Gas Sampling at the Building U-3 Petroleum, Oils, and Lubricants (POL) Site, Camp Ripley, Minnesota

This letter report contains the results of an initial soil gas characterization performed by Parsons Engineering Science, Inc. Parsons ES at the subject site on 27 March 1996. The initial soil gas characterization was performed after a meeting held on 26 March 1996 at Camp Ripley to initiate Option 3 bioventing pilot testing under the AFCEE Extended Bioventing Project Cortract F41624-92-D-8036, Delivery Order 17. The Building U-3 POL Site is a former truck service area where fuels were stored and dispensed. Tank removal, subsurface investigation activities, and corrective action design at the site were performed by Wenck Associates, Inc. Wenck, of Maple Plain, Minnesota. The following background information has been summarized from a report entitled Remedial InvestigationCorrective Action Design Report, Camp Ripley, Building U-3 POL Wenck, May 1994. One 10,000-gallon diesel fuel underground storage tank UST, one 10,000-gallon gasoline UST, one 5,000-gallon gasoline UST, and a dispenser pump island that formerly existed at the site were removed in 1992. The 5,000-gallon UST and the product piping associated with the dispenser pump island are believed to be the primary sources of contamination at this site. Tank and dispenser pump island locations are illustrated in Figures 7 and 8 of the Wenck report, included in Attachment A to this letter.