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1 The limits of both soil and groundwater contamination have <br /> been well delineated in all directions <br /> 2 Soil contamination is highest in the area between the pump <br /> islands and the site of the removed UST' s . This indicates that <br /> the dispensing pumps and/or product lines were a major source <br /> of contamination <br /> 3 The highest levels of groundwater contamination have been <br /> measured in MW-1, which is upgradient from the source (s) based <br /> upon data collected to date This indicates that the gradient <br /> has been divergent in prior years <br /> 4 Soil contamination exists between depths of 10 ' & 231 bgl, <br /> which corresponds to the "smear zone" created by a fluctuating <br /> water table. Contamination was not detected above 10 ' or below <br /> 251 bgl <br /> CONCLUSIONS <br /> 1 The limits of soil & groundwater contamination have been <br /> fully defined in all directions <br /> 2 Soil contamination has not extended below approximately 231 , <br /> and has been restricted to the "smear zone " <br /> 3 The groundwater plume has stabilized and migrated only a <br /> short distance offsite to the west . <br /> 4 There are no domestic water wells within 250 ' of the exising <br /> plume . <br /> RECOMMENDATIONS <br /> Based upon a thorough analysis of all of the available data, we <br /> do not believe that further work is required, and that the site <br /> should be closed However, if further work is required, we <br /> propose the following: <br /> 1 Remove existing canopy & pump islands <br /> 2 . Destroy monitoring well #1 & possibly #3 <br /> 3 Excavate an area approximately 35 ' x 351 x 201 deep (900 <br /> cubic yards ) Separate clean soil from contaminated, (based upon <br /> soil sample analysis, the top 10 feet is clean ) Place the <br /> contaminated soil at rear of property for aeration, approxi- <br /> 6 <br />