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compounds) Assuming the loss of soil-bound hydrocarbon follows the <br /> mechanism described above, the remaining hydrocarbons are some of the <br /> least volatile gasoline components These are the gasoline components that <br /> are relatively insoluble, and not readily available for transport <br /> (volatilization, diffusion, advection) m the subsurface environment Also <br /> consider that the notable volatile (and soluble) components of gasoline, <br /> BTEX compounds, were not significantly detected in recently collected soil <br /> samples <br /> • It is anticipated that in the near future, the site will be the location of a <br /> restaurant <br /> Remediation Design Conclusions <br /> • Resources should focus on the isolated impacted soil volumes <br /> • Applicable soil remediation technologies are those that will address <br /> moderate to high molecular weight gasoline components <br /> • Nfigratnon of residual hydrocarbons in groundwater is not an immediate <br /> threat More data are required to better define the migration potential <br /> • Extensive groundwater pumping in the area has caused a severe overdraft <br /> • condition Also, the seasonal fluctuation in groundwater elevation is <br /> significant On average, the elevation seasonally vanes b to 8 feet <br /> Historically, the groundwater elevation has vaned over 20 feet (between <br /> 3 5 and 5 8 feet bgs) <br /> • Dry wells not used for remediation purposes should be abandoned <br /> • The expected property use must be considered in the design <br /> Resolution 9249 was consulted for applicable technologies, as was available literature Only <br /> technologies that would apply to site-specific conditions were considered, and technologies <br /> were eliminated from further consideration on the bans of technical unplementabihty Table 2 <br /> lists the technologies considered, along with comments regarding the screening of each <br /> technology Technologies that passed the screening process and were found suitable for <br /> constructing a remedial alternative were <br /> • SVE/Bioventing <br /> • Thermal Oxidation <br /> • Carbon/Resm Adsorption <br /> • Remediation Monitonng/Data Collection <br /> 3201337B/1918REV 20 August 31, 1995 <br />