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PROBLEM ASSESSMENT REPORT <br /> 1606 South EI Dorello Street Stockton Cdiforrne <br /> groundwater monitoring wells contained detectable concentrations of petroleum <br /> hydrocarbons except MW-4 The hydrocarbons detected in well MW-6, off site and <br /> upgradient, may be indicating an offsite source <br /> 5 0 REMEDIAL ACTION ALTERNATIVES <br /> This section and Appendix G present a discussion of soil and groundwater remediation <br /> alternatives For both media, the alternatives may be placed in one of the following <br /> three categories 1 ) no action, 2) in-situ methods (remediation in place, requiring no <br /> soil or groundwater removal), and 3) ex-situ methods (remediation requiring removal <br /> of the soil or groundwater) <br /> Recommended remedial alternatives are presented below Other methods are <br /> described further in Appendix G <br /> 5 1 Soil <br /> In general, soil remediation alternatives are dictated by site size, subsurface <br /> conditions, contaminant types, contaminant concentrations, and the volume of <br /> contaminated soil Ex-situ soil remediation involves excavation of the soil and the <br /> selection of an appropriate treatment and/or disposal option In-situ remediation <br /> options generally include the prevention of the migration of contaminants or <br /> destruction/removal of the contaminants while stall in the subsurface Typically, soil <br /> treatment options are effective for a limited number of organic compounds The <br /> presence of certain organic compounds (polychlorinated biphenyls, certain pesticides, <br /> etc ) and certain inorganic compounds (metals, acids, etc ) above regulated <br /> concentrations may limit treatment and disposal options In some cases where <br /> multiple contaminants are involved, treatment is necessary to reduce contaminant <br /> concentrations of a select number of compounds in order to increase disposal options <br /> The following soil remediation alternatives are discussed in Appendix G <br /> • No action <br /> i <br /> • Ex-situ (soil excavation) remediation options <br /> - Bioremediation <br /> - Vapor extraction <br /> - Incineration <br /> Landfilling <br /> • In-situ remediation options <br /> Vapor extraction <br /> Bioremediation <br /> - Physical containment <br /> 91-044A PAR 10 <br />