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Cecchuu, Cecchvu, and Govannom Fueling Island <br /> fueling island facility after the underground fuel storage tanks and piping system are <br /> removed The hydrocarbon-impacted soils would be excavated to a depth of <br /> approximately 25 feet, followed by backfilling with compacted engineered fill material <br /> The deeper phase of cleanup would utilize the technology of bioremediation wherein au <br /> is injected into the hydrocarbon unpacted zone between the shallow excavated soil and the <br /> deeper ground water Wall the addition of oxygen, growth of hydrocarbon-utilizing <br /> microbes would occur The microbes will be stimulated to degrade the residual <br /> hydrocarbons into the harmless byproducts of carbon dioxide and water Air source <br /> testing of QIP-1 should be planned when ground water levels are lower to allow <br /> measurements of air flow in the unsaturated screen intervals of the surrounding <br /> monitoring wells The reduction of leachable hydrocarbons will assist in a cleanup of <br /> ground water and a site that is below levels of concern for human health or <br /> environmental risk <br /> 5e0 Recommendations <br /> 1 ESE recommends continued quarterly monitoring of monitoring wells surrounding <br /> the fueling island facility. The recommended monitoring program is as follows: <br /> 0 Quarterly water level measurements in all UST monitoring wells, including <br /> the small water supply well, <br /> 0 Continuance of quarterly ground water sampling with analysis for TPH-D and <br /> TPH-G, and BTEX in wells UST-2 through UST-5, and <br /> 0 Quarterly reporting of all site activities related to the underground fuel tank <br /> area <br /> GO 2. Perform a soil vapor air-mjection test in STP-1 when ground water levels have <br /> further decreased allowing the use of available unsaturated screen in UST-2 <br /> through UST-5 to monitor the effects of air flow m the subsurface <br /> F N69254W\2QM96 RPT 8 Environmental Science do Ehgweering, Inc <br />