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Former Countryside Market,Stockton, California <br /> Feasibility Study and Interim Remedial Action Plan May 20,2013 <br /> Given the relatively low toxicities of petroleum hydrocarbons, excluding the above-referenced <br /> constituents, the final cleanup level for TPHg is proposed at 1,000 µg/L. <br /> Groundwater beneath the Site and surrounding area is used for domes is purposes. The MCLS for <br /> the primary contaminants of concern (i.e., 1,2-DCA and Benzene) are very low/difficult to achieve <br /> throughout the existing zone of impacted groundwater, and may not be feasible using the best <br /> available cleanup technologies. <br /> State Water Resources Control Board (SWRCB) Resolution No. 92-49 allows for cessation of active <br /> remedial measures at interim cleanup levels, above final cleanup concentrations (i.e., when active <br /> remediation is no longer feasible/cost-effective and natural attenuation p cesses can efficiently serve <br /> to reduce the residual concentrations to final cleanup levels). Residual or background concentrations <br /> may not meet the cleanup standards at the time of requested closure, but rather the standards within <br /> a 'reasonable period", interpreted by the SWRCB as decades or longer. Therefore, in addition to the <br /> final cleanup levels, SGI may propose interim cleanup levels within the p ume as part of the final RAP <br /> if it can be established that such levels will not result in an exceeden a of final cleanup levels at <br /> receptor points (i.e., downgradient domestic wells). <br /> Fea.O,I4 swy and lFeasb*SMY B IRAP_T"FnaLcbc 8-2 IThe Source Group,Inc. <br />