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' ..29 April 2005 . AGE-NC�Praject No:98-.0440. ' Page 8.of 18 ' ' . • ; The nearest surface water feature in the'vicinity"of the site,which may interact with the-local ground; ' ,• •is the San Joaquin River approximately fifteen miles,southeast of the site.It is unlikely that impacted . ,grround. water of the `site would represent a significant pollution threat the river base&upon the; ' distance`from the site. 6..0. ' SOIL REMEDIATION•ALTERNATIVES Based on-the distribution and concentrations of petroleum hydrocarbons'in soil at the site, and-on " ' site-specific conditions,AGE considers ex-situ soil treatment;potential"In-situ bio-'remediation and. , natural. attenuation as appropriate remedial- technologies- or strategies '.to consider to address f hydrocarbon=impacted sail at the site.. 6.1. "EX-SITU TREATMENT OF IMPACTED'SOIL Hydrocarbon impacted soil.can be excavated and treated ex-situ ori-site or transported off--site for recycling/disposal.On-site treatment alternatives include aeration,bioremediation,vapor extraction; and thermal destruction;all are feasible methods for above-ground remediation of soil contaminated with gasoline. Off-site disposal generally involves transportation of the impacted soil to.a licensed treatment/disposal facility. 6.1.1. Excavation All of the above-mentioned:methods of ex-situ treatment'require excavation of the impacted' so'I which is generally the fastest-and:most effective method for soil remediation.'Once excavated; the. impacted soil is generally stockpiled on-site for treatment or transported for disposal.If soil is treated on-site and the hydrocar6oli concentrations can be reduced to concentrations 'set by the lead agency , or to. non-detectable'concentrations, the, soil can be used to-hackfill they excavation.- If, the I, hydrocarbon-impacted soil is disposed-off--site, fill material, must be imported to backfill the', excavation. ' '6.1.2. Feasibility:of Excavation , Excavation of impacted.soil,followed by ex-situ treatment and/or disposal is a very effective method of remediation.Theoretically,all or at least the majority.of the impacted soil is removed.In addition, longer-chain hydrocarbons are easily remediated with excavation while in-situ methods are slower I or are ineffective.Ho eve w r,,excavcosts ation cast can be exces�s i've �if: 1 'the volume op f the impacted soil, LL , F Advanced GeoEnvironmenta1,Inc.