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ENSR <br /> 1 .0 Introduction and context <br /> This Conceptual Site Model (CSM) Report has been developed for the former Unocal Station No 2859 site <br /> (the site) located at 1665 Pacific Avenue in Stockton, California This CSM Report is being submitted to <br /> provide a framework for planning and executing ongoing investigation and remedial activities at the site <br /> Ongoing site activities have been documented in quarterly groundwater monitoring reports and ozone <br /> microsparge system status reports <br />' The objective of this CSM Report is to synthesize available site data into a CSM sufficient to <br /> • identify outstanding data gaps, <br /> • plan relevant investigation activities to meet those data gaps, <br /> • screen remedial action alternatives to assess whether currently operating remedial activities will <br />' adequately protect human health, safety, and the environment, and will restore or protect current or <br /> potential beneficial uses of water or whether expanded or alternative remedial actions may be <br /> preferred <br /> This CSM Report includes the following elements <br /> • a summary of the site conditions and the extent of residual contamination, <br /> identification of potentially applicable cleanup levels for groundwater and soils, <br /> identification of relevant data gaps, <br /> C a plan of additional investigation activities necessary to address those data gaps, <br /> G an evaluation of the effectiveness of the existing ozone microsparging system, and <br /> G a preliminary screening of additional remedial alternatives applicable to site conditions that have <br /> the potential to achieve applicable cleanup levels <br /> t-1 !pill 06 2006 <br />