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, M <br /> t <br /> F, <br /> ti <br /> originating from the Fxxon prorandTohe ne <br /> originating from the Chevron property. Lume s can <br /> extent of benzene concentrations in <br /> e PI they <br /> be defined, however, <br /> tile ground water cannot be adequately defined. <br /> e plume's wag beyondion othetscoPer heyofothebinvestigation, <br /> plumes was beyond <br /> responsible parties may <br /> hoWeverr, onduc <br /> need to conduct similar investigative din ted effort <br /> cooperation with Mobil Oil. A <br /> among the involved parties will be necessary. <br /> o Based on these findings, it was concluded that no <br /> A feasibility study <br /> further characterization of the onsite subsurface <br /> hydrocarbon plume was necessary• ial <br /> was performed toeraddressine the mthe nature and ost viable eextent <br /> alternative toproperly <br /> of hydrocarbon-affected ground water at the site. <br /> Ground water treatment tedpcarbs cahiolognsl icalered ncluded <br /> air stripping, ? <br /> ht Uv /hydrogen <br /> treatment, and ultraviolet lreferredalternative of <br /> peroxide. The recommended p <br /> this study was to install a <br /> recovery/treatment ofground water• <br /> using activated carbon for treatment of g <br /> The initial. system would be designed to recover and <br /> treat ground water from onsite wells only. <br /> Activated carbon treatment was chosen <br /> sincetthe. <br /> biological and W treatment opt <br /> to be unacceptable in term <br /> whileined <br /> oairl�atrippingrwasyr <br /> cost, and reliability, cal since a as ent <br /> r determined not sorbemission concentrations would be <br /> reduction of vap Air Pollution <br /> required by the San Joaquin <br /> of the vapor <br /> Control District (APCD) r reg <br /> concentrations. Air stripping is also less <br /> preferable in terms of noise and aesthetic <br /> considerations. <br /> Based on the results and findings of the supplemental site <br /> investigation, Alton Geoscience reco:mnert�ded the following; <br /> 1, preparation of a remedial work plan for the ground <br /> water onsite for submittal and approval by the <br /> appropriate regulatory agencies. <br /> 2, Development and implementation <br /> of the selectedroduct <br /> remediation option to address the free-floating p <br /> .plume.....�n..the ground water. <br /> and dissa ve - hase. _.. ..._ . .._ . <br /> 5 <br />