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3 <br /> solely by contamination coming from the Geweke site. A <br /> comparison of seasonal groundwater flow directions in the <br /> area suggests that at various times of the year the Gewe}:e <br /> site may be directly downgradient from the Beacon site. This <br /> is not to be construed as putting the sole source of ground- <br /> water contamination as being the Beacon station. <br /> 2. The seasonal fluctuations of groundwater beneath the site do <br /> not appear to be significant enough to bring the groundwater <br /> table into contact with shallow hydrocarbons-contaminated <br /> soils on a recurring basis. <br /> As the Geweke site has been <br /> paved, thereby retarding the infiltration and percolation of <br /> L- <br /> water through the soils beneath the site, and seasonal <br /> groundwater table fluctuations are low, the current potential <br /> for groundwater contamination due to water percolating <br /> through the soils remaining beneath the site is minimal. <br /> 3. Insufficient data exist to conclude that the former <br /> underground storage tanks located at the real estate office <br /> west of the property are a source of contamination. It is <br /> not practical to proceed with an investigation of this source <br /> at this time. <br /> Recommendations <br /> PC recommends that Geweke Properties proceed as follows: <br /> 1. A groundwater extraction and air stripping system should not <br /> be installed at this time. BC believes that the problem is <br /> more regional than originally thought. An extraction/ <br /> stripping system installed by Geweke Properties would be <br /> helping to clean up a regional problem; the cost of cleanup <br /> should be oorne conjunctively. A more intensive investi- <br /> gation is required by others before groundwater cleanup <br /> �. <br />