Laserfiche WebLink
ENSR AECONI <br /> 1 .0 Introduction and context <br /> This Conceptual Site Model (CSM) Report has been developed for the former Unocal Station No.0187 site <br /> (the site) located at 437 East Miner 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 are being documented in quarterly groundwater monitoring and ozone microsparge <br /> system status reports. <br /> The objective of this CSM Report is to synthesize available site data into a conceptual site model 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 operational 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 /> se • identification of relevant data gaps; <br /> • a plan of additional investigation activities necessary to address those data gaps; <br /> • an evaluation of the effectiveness of the existing ozone microsparging system; and <br /> • a preliminary screening of additional remedial alternatives applicable to site conditions that have the <br /> potential to achieve applicable cleanup levels. <br /> i6 <br /> J:1Rem_EngWroject Files1P60(6000- <br /> 6999)16940-UNOCAL Portfolio Closure16940- 1-1 January2006 <br /> UNOCAL Portfolio Closure%Site 0167-Stockton <br /> East Minor%CSM Report\CSM Report_Final.doc <br />