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Former Beacon Station No 12419 March 18,2002 Stockton California Problem Assessment Report/Corrective Action Plan during the AST Induced pressure responses measured in monitoring wells MW-3 and MW- 9 suggest a radius of influence between 10 and 20 feet from air sparge well AS-1 (Figure 9) The results of the AST indicate that air sparging would be effective in supplementing soil vapor extraction 10.0 REMEDIATION ALTERNATIVES Remediation alternatives are selected on the basis of remediation goals evaluated, in part, by the present and potential future uses of the groundwater resource at the site and the potential threat posed by the Impact to human health and the environment The ideal remediation goal would be to reduce constituents to non-detectable concentrations As in most cases, this goal is not economically or technically feasible, or necessary to protect human health and the environment 10.1 Soil Remediation Alternatives The following soil remediation alternatives are discussed in this section • Passive Remediation • Sol] Vapor Extraction • Excavation and Disposal • Excavation and Aboveground Treatment 10.1.1 Passive Remediation Passive remediation is an alternative in which petroleum hydrocarbons are not actively removed and natural attenuation processes are allowed to proceed resulting in the reduction and dissipation of petroleum hydrocarbon concentrations the soil and groundwater • environments Processes of natural attenuation Include dispersion, volatilization, adsorption, aerobic and anaerobic biodegradation 419PARCAP3-02 doc 19 Project No 1419 23 HORIZON ENVIRONMENTAL INC.