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magnesium oxide In the presence of water, magnesium oxide reacts to form magnesium <br /> peroxide and oxygen The oxygen released in the passive treatment zone would increase the <br />' hydrocarbon biodegradation rate The passive treatment zone remedial option does not pass the <br /> screening, because it will not result in reduction or removal of the submerged hydrocarbon <br /> source at former Exxon RS 7-3942 and cannot be implemented without extensive off-site <br /> construction <br /> 7.6 UVB <br /> The UVB remedial option entails the installation of a 16-in diameter well with upper and lower <br />' screens which permit the extraction of groundwater through the lower screen, stripping of <br /> volatiles and enhancement of oxygen content in an in-situ air stripper, and reinfection of treated <br /> groundwater through the upper screen The UVB remedial option, described in detail in the <br />' preceding sections of this document, passes the screening and is proposed as the best remedial <br /> option for former Exxon RS 7-3942, because it has been proven to be effective at source <br /> reduction or removal, it will not involve the discharge or infection of treated water, it will not <br />' result in pulling off-site upgradient sources into the site, it has been proven to be effective at <br /> source reduction or removal, and has relatively low capital costs and low O&M costs <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br />' WP61 73941WP1096 TX 5 14 <br />