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Former Beacon Station No 12419 March 18,2002 Stockton California Problem Assessment Report/Corrective Action Plan 11.0 REMEDIATION OBJECTIVE OPTIONS The site is currently used as a retail gasoline station Site usage is not expected to change in the foreseeable future Historical groundwater monitoring data indicate the groundwater gradient is shallow and the impacted groundwater plume has remained relatively stable The lateral and vertical extent of petroleum hydrocarbons in soil and groundwater are effectively delineated by the site investigation work performed to date 11.1 Remediation of Soil and Groundwater to Non-Detectable Concentrations Remediation to non-detectable concentrations or natural background concentrations in soil and groundwater at the site would likely require additional excavation, and long-term in-situ soil vapor and groundwater extraction It is Horizon's professional opinion that remediation of petroleum hydrocarbons in soil and groundwater to non-detectable concentrations is not economically or technically feasible within a reasonable period of time, or is it necessary to • protect human health and the environment 11.2 Remediation to Maximum Extent Feasible for Protection of Beneficial Uses of Groundwater Remediation of petroleum hydrocarbons in soil and groundwater to maximum extent feasible for protection of beneficial uses of groundwater would likely require long-term in- situ soil vapor and groundwater extraction Remediation of the groundwater to maximum extent feasible for protection of beneficial uses of groundwater is not economically reasonable or is it necessary to protect human health and the environment because the groundwater resource which is encompassed by the groundwater plume is not being used and is not likely to be used in the foreseeable future Additionally, the relatively stable plume can be controlled by moderate levels of remedial action 419PARCAP3-02 doc 24 PrQlect No 1419 23 HORIZON ENVIRONMENTAL INC.