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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 /> beneath the site The Stockton Service Center site has been subjected to extensive <br /> ' assessment, monitoring, modeling, and review during the past seven years The <br /> District believes that the site pose little or no risk to human health or the <br /> ' environment and the site should be closed allowing the residual contamination to <br /> naturally attenuate <br /> The Stockton Service Center has been demonstrated to be a low risk site through <br /> ' assessment, monitoring, and modeling Although concentrations of petroleum <br /> hydrocarbons in the groundwater beneath the site are in excess of California water <br /> ' quality cleanup goals, the contarmnation poses little or no risk to human health or <br /> the environment The combination of site conditions and naturally occurring <br /> bioremediaton will contain and degrade the contaminants Closure of the site with <br /> no further action is warranted This 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 /> • The plume has stabilized contaminants have migrated approximately 85 feet in <br /> ' 9 years <br /> • Passive bioremediation is occurring at the site <br /> 0 Contaminant fate and transport modeling indicates that BTEX concentrations <br /> present in groundwater beneath the site do not pose a risk even if no <br /> ' bioremediaton were occurring <br /> • The shallow aquifer in which the plume has been detected is not a source of <br /> drinking water <br /> ' 96R7 East Bay Municipal Utility Distract <br /> 40429700 fcr 17 Final Closure Report <br /> 1 <br />