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1 <br /> ARCADiS GERAGHTY&MILLER <br /> • An examination of the longest record of continuous monitoring data available at <br /> the site (5 years) shows that the groundwater plume front is at least stable, and <br /> 1 <br /> potentially declining, and has not substantially moved <br />' Multiple lines of biogeochermcal data (rncludsng dissolved oxygen, nitrates, iron <br /> (11), sulfates, and dissolved methane data) indicate that the groundwater plume is <br />' undergoing n ucrobially mediated biodegradation <br />' The findings and conclusions presented in this report are consistent with the findings of <br /> previous consultants at the Site The data collected, analyzed, and evaluated in this report <br /> indicate that the Site has been adequately characterized The Site is self remediating through <br /> the mechanisms of natural attenuation and intrinsic biodegradation, notwithstanding the poor <br />' ambient water quality that exists at the Site irrespective of the petroleum hydrocarbon impacts <br /> The characterization of the Site impacts as presented in this report provides the basis for <br /> 4 estimating the mass of constituents in the subsurface and the volume of impacted soil and <br />' groundwater If continued, further monitoring efforts at the Site will serve to document the <br /> volumetric stability and concentration (and,therefore, mass)decline of the plume <br />' It is concluded that sufficient data now exists upon which to base the formulation of a <br /> Corrective Action Plan ,_ �o c� J"�. 1 <br /> i <br /> I49 <br />