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' The application of this technology at this site is favorable because the known source of <br /> contamination has essentially been removed by excavating the fuel storage tanks and <br /> approximately 2000 cubic yards of contaminated soils Also, only a minimal amount of free <br />' product was observed during installation and sampling of groundwater monitor wells. The <br /> geology, hydrogeology, and environmental subsurface conditions of the site are also favorable <br /> for in situ attenuation processes such as biodegradation, chemical reactions with the soil <br />' materials, and adsorption <br /> Intrinsic remediation is not appropriate where there are imminent risks to human health and the <br /> environment However, this is not the case at this site The site is located in an urban <br /> environment where the existing contamination in the groundwater is under city streets, <br /> sidewalks, or buildings. Underground access is restricted by permit applications through the city <br /> and county The nearest surface water is the Mormon Slough, which is approximately one-half <br /> mile south (upgradient) of the site There is no current groundwater usage within 4,800 feet <br /> downgradient, this is not likely to change in the near future <br /> Because of the potential effectiveness of this technology and the ease of implementability, this <br /> atechnology has been retained for further evaluation <br />' Table 9 provides a summary of the results of technology screening <br /> Table 9 <br /> Results of Technology Screening <br /> Retained or <br /> Technology Eliminated Comments <br /> Pump and Treat Eliminated Requires long remediation periods, difficult to <br /> dispose of treated water, requires relatively <br /> more operation and maintenance effort than <br />' other technologies <br /> Air Sparging Soil Retained Simple to operate, requires minimal material <br /> Vapor Extraction disposal, effective <br />' Containment Eliminated <br /> Difficult to install, will cause much <br /> interruption, <br /> In-situ Bioremediation Retained Relatively simple to install compared to other <br /> technologies, no material disposal, minimum <br /> operation and maintenance costs, effective <br /> Intrinsic Retained Relatively simple to install compared to other <br /> Bioremediation technologies, site data indicates its <br /> effectiveness is good, no material disposal, <br /> minimum operation and maintenance costs <br /> • <br /> LIPROJECTS%5ANJOQIHSMACnONEPL 35 <br />