<P>The Military Engineer L No. 66363 Environmental Engineering Multiple Contaminant Removal By Robert Beckwith, PG Where others had failed, a remediation team under a performance-based contract successfully eliminated contamination at a former training site in Florida. F rom 1981 to 1992, the Little Ce- dar Creek Fire Training Area at Tyndall Air Force Base, Fla., pro- vided a training ground for ?re?ghters on aircraft and fuel spill ?res. Although such training is essential in military set- tings, an unfortunate side effect of such land usage is contamination of soil and groundwater caused by the use of ?re accelerants. In the case of the Little Ce- dar Creek Fire Training Area, an August 1999 contamination assessment report of Site FT023 showed soil and ground- water contamination due to petroleum constituents with free product. January 2002 tests con?rmed approximately 2,600-gal of petroleum free product in the areas shallow aquifer. Toluene, ethylbenzene and total xy- lene levels exceeded the Florida De- partment of Environmental Protection (FDEP) soil cleanup target levels (SCTL) for leachability criteria. Benzene ex- ceeded residential SCTL, and total pe- troleum hydrocarbons exceeded indus- trial criteria during sampling performed in 2002. Furthermore, well sampling in 2004 revealed benzene, toluene, ethyl- benzene and total xylene (BTEX) levels exceededing FDEP groundwater target cleanup levels (GTCL). Benzene ex- ceeded the Environmental Protection Agencys (EPA) maximum contaminant level and light non-aqueous phase liq- uid was detected at the site at a thick- ness of .5-ft. Earlier cleanup efforts at Site FT023, including passive and manual removal methods and one attempted interim remedial action, had only minimally impacted free product levels. Clearly, a more aggressive technical approach was needed to bring Site FT023 into en- vironmental compliance. In 2005, TolTest Inc. was tasked to reassess the site under an Air Force en- vironmental contract managed by the Air Force Center for Engineering and the Environment (AFCEE). The proj- ect team applied value engineering of several technical approaches, with the goal of optimizing volatile organic com- pound (VOC) contaminant removal. A total of 7,632-yd3 of petroleum-con- taminated soil was either transported and disposed off site or treated on site by aeration between July 2005 and Au- gust 2006. In-situ chemical oxidation (ISCO) injection events performed in 2007 reduced the remaining VOCs to within FDEP natural attenuation de- fault concentrations (NADC). Based on the successful implemen- tation of the soil and groundwater remedies and the residual low levels of groundwater contamination remain- ing at the site, the closure strategy im- plemented was termination of active remediation and natural attenuation A trommel unit expedites aeration of site soils for successful treatment. Treated soils are then used as back?ll. Photo courtesy TolTest Inc.</p> <UL><LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/1/1/">Front-Cover</a></LI> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/2/2/">Inside-Cover</a></LI> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/3/3/">Page-1</a></LI> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/4/4/">Page-2</a></LI> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/5/5/">Page-3</a></LI> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/6/6/">Page-4</a></LI> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/7/7/">Page-5</a></LI> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/8/8/">Page-6</a></LI> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/9/9/">Page-7</a></LI> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/10/10/">Page-8</a></LI> 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