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i <br /> 4.0 Conclusions <br /> „ An unauthorized release of petroleum products at the Stockton Service Center <br /> site has resulted in a small petroleum hydrocarbon plume in the groundwater <br /> i <br /> beneath the site. The Stockton Service Center site has been subjected to extensive <br /> assessment, monitoring, modeling, and review during the past 7 years. Based on the <br /> f contaminant fate an transport model and the criterion established in the modified <br /> E <br /> l <br /> ASTM RBCA framework, ' the site does not pose a significant human or <br /> environmental risk and should be closed without further investigation or review. This <br /> l <br /> conclusion is based on the following factors: <br /> • The source of contamination has been removed from the site. <br /> • The contamination at the site has been fully characterized <br /> T e TheP lume has stabilized. <br /> • Passive bioremediation is occurring at the site. <br /> e Contaminant fate and transport modeling indicates that BTEX concentrations <br /> present in groundwater beneath the site do not pose a risk.. <br /> • The shallow aquifer in which the plume has been detected is not a source of <br /> drinking water. <br /> f <br /> 96K7 Fast Bay Municipal Utility District <br /> 40429700.fcr 14 Final Closure Report <br /> LI <br /> i <br /> i <br />