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i i i a i i i i i i i i i � �■ �■ �■ � � TABLES SOIL REMEDIATION ALTERNATIVES Cherokee Truck Stop 3535 East Cherokee Road, Stockton, California u Hslirvood Costa{mrd 1'j Z l�itclfu2g 1<& t rated M�csd Advantages l�isailvarttag�,� l�ttitiito�ng and Requtreri�t►t� l�i�� cavation •Theoretical removal of 100%of •Cost-effectiveness decreases with depth of $600,000 to$750,000 Monitoring of 1 month for ' contaminants•Relatively short contamination•Cannot cleanup under for excavation,disposal excavated soil, excavation and ection 71 remediation period•Effective structures•Excavated soil must be treated or and backfill-does not collection of soil disposal,6 to 12 „ remediation of all soil types disposed•Backfill material and compaction include disruption to samples upon months if soil costs can be excessive•Disruption of day to business or building completion of treatment is , day business,unacceptable to client and demolition/repair excavation required r tenant - I n-situ •Relatively simple design and •Regulatory approval can be difficult to $120,000 to$235,000 Monthly monitoring or 36 to 48 months Bioremediation operation•Works well in most soil obtain•Additional inoculations and nutrient total cost organic vapor,carbon types where no biotoxicity is present supplementation sometimes necessary•Less dioxide and dissolved ecnon 7 2 effective in soils with high concentrations of 1 1 oxygen,quarterly hydrocarbons,low nutrients or low%of ground water/soil hydrocarbon biodegiaders - sample collection - atwul •Lower costs than most active •Not effective for higher contaminant $11,000 to$22,000 Installation of unknown , ttenuation r remedial alternatives•Minimal concentrations•Migration of contamination annually additional borings, - disturbance to the site•Potential use may occur•Longer time frarne than active Ground water _ ectron 7 3 below structures remediation•May not achieve cleanup levels monitoring within reasonable length of time-Less effective in soils with high concentrations of hydrocarbons,low nutrients or low%of hydrocarbon biodegraders o Further Action •No disturbance to the site•Very •Migration of contamination may occur• No cost - None not applicable low cost Significant time required to achieve cleanup ectron 7 4 levels k , + 1