Full-Scale Startup of a Soil Venting-Based in Situ Bioremediation Field Pilot Study at Fallon NAS, Nevada

This report summarizes the first year of operation of the Navy's NAS Fallon Bioslurper system. The bioslurper system was installed to recover free-phase JP-5 from the shallow water table and to aerate the vadose zone through low flow vapor extraction (bioventing). Full-scale startup of the bioslurper system was initiated in January of 1993. Through December 31, 1993 the bioslurper system had recovered a total of 47,272 lbs of JP-5 contamination. Mass removal was 97 % in the liquid phase (free-product), 2.7 % in the vapor phase, and 0.3 % in the aqueous phase. To date, the NAS Fallon bioslurper site indicates that oxygen concentrations in the vadose zone are not limiting biodegradation. It appears that some other site factor is limiting biodegradation. Future work at the site will include an optimization of the free-product recovery process and the further identification of factors which may be limiting biodegradation.