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• compounds) Assuming the loss of soil-bound hydrocarbon follows the mechanism described above, the remaining hydrocarbons are some of the least volatile gasoline components These are the gasoline components that are relatively insoluble, and not readily available for transport (volatilization, diffusion, and advection) in the subsurface environment Also consider that the notable volatile (and soluble) components of gaso- lene, BTEX compounds, were not significantly detected in recently collected soil samples • It 1s anticipated that in the near future, the site will be the location of a restaurant Remediation Design Conclusions • Resources should focus on the isolated impacted soil and groundwater • Applicable soil remediation technologies are those that will address moderate to high molecular weight gasoline components • Migration of residual hydrocarbons in groundwater is not an immediate threat More data are required to better define the migration potential • Extensive groundwater pumping in the area has caused a severe overdraft . condition Also, the seasonal fluctuation in groundwater elevation is significant On average, the elevation seasonally vanes 6 to 8 feet Historically, the groundwater elevation has vaned over 20 feet (between 35 and 58 feet bgs) • Dry wells not used for remediation purposes should be abandoned • The expected property use must be considered in the design Resolution 92-49 was consulted for applicable technologies, as was available literature Only technologies that would apply to site-specific conditions were considered, and technologies were eliminated from further consideration on the basis of technical implementability Table 3 lists the technologies considered, along with comments regarding the screening of each technology The technologies reviewed in the screening process were • SVE/Bioventing • Groundwater Extraction • Soil Vapor Extraction • Spargmg (in-situ) 3201337E/CAP_AMD DOC 16 November 30, 1995