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ARCADIS GERAGHTY&MILLER <br /> Concentrations of petroleum hydrocarbons in shallow groundwater have declined <br /> significantly over the 5-year period of the monitoring record An examination of monitoring <br /> ' data shows that the groundwater plume front is stable, possibly reduced in area extent, and has <br /> not substantially moved Multiple lines of biogeochemical data (including dissolved oxygen, <br /> nitrates, iron (Il), sulfates, and dissolved methane data) indicate that the shallow groundwater <br /> ' plume is undergoing microbial mediated biodegradation The site is self-remednatmg through <br /> ' the mechanisms of natural attenuation and intrinsic biodegradation, notwithstanding the poor <br /> water quality that emsts at the Site irrespective of the petroleum hydrocarbon impacts <br /> The data collected, analyzed, and evaluated in this project indicate that the Site has <br /> ' been adequately characterized It is further concluded that sufficient information and data now <br /> exist with the respect to the Site upon which to base the formulation of a Corrective Action <br /> Plan <br /> V11 <br />