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1. • �R. Y � J � a' �ldy� ,. �N. <br /> MR <br /> Woodward-Clyde <br /> 5.0 EVALUATION OF REMEDIALACTION ALTERNATIVES ies <br /> hich are <br /> hnolo <br /> This <br /> evaluation is aimed at identifying realistic remedial lentaminatedwso fs and <br /> appropriate for application at downgradient areas or within c <br /> California. The evaluation <br /> groundwater at the Caltrans Shop 10 facility in Stockton, and operations and that <br /> considers the use of the site for Caltrans maiMainence Y p in WCC's <br /> groundwater beneath the site is a source of potable water (see well survey <br /> rby groundwater use). it also recognizes that the <br /> Preliminary Report for nea <br /> contaminated medium at the Caltrans Shop 10 facility is 'tater Ilf quality must bereturned" <br /> and groundwater (lo a depth of at least 60 feet) and that wraundwater within i12 mile of <br /> to levels acceptable to the regulatory agencies. Because g <br /> this remedial action alternatives analysis assumes <br /> the site is used by domestic welts, <br /> that 1990 DOHS Action Levels for Drinking ev`s ra I Contaminantnd EPA Maximum <br /> Table 5 with he watern l <br /> ayses <br /> Levels (MCL's) apply. A comparison of these <br /> obtained from the site is shown in Table 4, <br /> indicates that benzene, toluene and <br /> at exceed the states and E <br /> ethylbenzena are present in groundwater at concentrations thPA <br /> appropriate <br /> action levels. This evaluation therefore considers technologies which are <br /> ---., ntaminants andlar control off-site migration and allow <br /> for the removal of these co <br /> in situ treatment. Technologies which considered <br /> 1) Excavation <br /> 2) On-site aeration <br /> 3) Of!-site soil !reatment <br /> 4) Landfilling <br /> 5) Soil Venting urn to <br /> 6 Groundwater extraction and treatment by aeration, carbon filtration, p P <br /> sewer, etc., 4 <br /> 7) Physical containment <br /> 8) Chemical neutralization <br /> 9) No action <br /> 5.1 srraWAU _rfl <br /> The alternative technologies present <br /> ther the technology is Proven},ed Geiow are screened for technievron e <br /> technical feasibility. <br /> technical maturity (to determine whe <br /> act, regulatory Compliance and cost efiectivertess, Constraints to implementing the <br /> imp which may be achieved, <br /> `. technologies are considered, in addition to the levels of cleanup <br /> l4 <br />