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1 <br />' Feasibility Study Report <br /> 1140 W Hammer Lane, Stockton, CA <br /> monitoring wells are already in place and accessible for monitoring <br /> Cntenon 7 Cost <br />' This alternative would entail minimal cost associated with periodic monitoring Additional measures <br /> may be required if subsurface contaminants migrate offsite or if regulatory agencies find this alternative <br /> unacceptable <br /> Cntenon 8 State acceptance <br /> Regulatory agencies have been hesitant to approve this alternative due to the long term duration of this <br />' alternative and the high benzene concentrations currently in well MW5 <br /> 1 Cntenon 9 Community acceptance <br /> Since minimal activity would be conducted at the site, the impact on the community would be very <br /> minor and not disruptive to the businesses located on the site and nearby <br /> 8.0 PROPOSED REMEDIATION ALTERNATIVE <br /> Based on the evaluation of remediation alternatives, Ground Zero proposes to utilize ORC to enhance <br /> natural attenuation of petroleum hydrocarbons in groundwater at the site As an interim measure, <br /> IORC socks will be added to wells MW I, MW3, and MW5 To monitor the efficacy of the process, <br /> Ground Zero proposes to monitor and sample wells MW 1, MW2, MW3, MW4, MW5, and MW8 on <br /> a semiannual basis Wells MWb and MW7 would be destroyed under permit from PHS/EHD <br /> ORC, manufactured by Regenesis Bioremediation Products (Regenesis) of San Juan Capistrano, <br /> California, is a patented formulation of magnesium peroxide (Mg02), which slowly releases oxygen <br /> when moist The hydrated product is magnesium hydroxide (Mg(OH)z) The oxygen release rate is <br /> dependent upon the level of the contaminant flux, but, according to Regenesis, will generally continue <br /> to release oxygen for about b months The continuing supply of oxygen to aerobic bacteria present in <br /> the subsurface should significantly increase the rate of biodegradation of petroleum hydrocarbon <br /> constituents Additional information regarding ORC, which was provided by Regenesis, is included in <br /> Appendix B <br /> G\1)1kt-\GR0UNUZE\KN0WLr-% Hnti11Rl 10RTSlreasd)ih1yRLport dot <br /> 18 <br />